Predicting chemical reactions: OCR GCSE Combined Science A questions

Every OCR GCSE Combined Science A exam question on C4.1 Predicting chemical reactions, 2018–2025, with its mark scheme and examiner’s report.

All 183 questions on Predicting chemical reactions, as a list

June 2025, Chemistry Paper 3 Foundation, Q11(a) (1 mark): Where are metals found in the Periodic Table? Use the Periodic Table. Tick (3) one box. On the left. On the left and right. On the right. [1]
June 2025, Chemistry Paper 3 Foundation, Q11(b) (1 mark): Which metal is found in Group 2 and Period 3 of the Periodic Table? Use the Periodic Table. Tick (3) one box. Aluminium Copper Magnesium [1]
June 2025, Chemistry Paper 4 Foundation, Q1 (1 mark): Which part of the Periodic Table contains the least reactive non-metals? D C A B Your answer [1]
June 2025, Chemistry Paper 4 Foundation, Q7 (1 mark): Which Group 7 element is a red-brown liquid at room temperature? A Fluorine B Chlorine C Bromine D Iodine Your answer [1]
June 2025, Chemistry Paper 4 Foundation, Q12(a)(i) (1 mark): Describe how these observations show how the reactivity of the elements increases going down Group 1. [1]
June 2025, Chemistry Paper 4 Foundation, Q12(a)(ii) (1 mark): Potassium is below sodium in Group 1. Describe one observation when a small piece of potassium is placed in water. Use information from Table 12.1. [1]
June 2025, Chemistry Paper 4 Foundation, Q12(b) (2 marks): When sodium reacts with water, it forms sodium hydroxide and hydrogen. Complete the word equation for the reaction of potassium with water. potassium + water +
June 2025, Chemistry Paper 4 Foundation, Q12(c)(ii) (1 mark): State the name of element X. [1]
June 2025, Chemistry Paper 4 Foundation, Q12(d) (2 marks): A more reactive Group 7 element displaces a less reactive Group 7 element from a solution of one of its salts. Chlorine reacts with potassium bromide as chlorin
June 2025, Chemistry Paper 4 Foundation, Q15(a) (1 mark): Fig. 15.2 shows the thermometer when the metal powder is magnesium. Fig. 15.2 80 70 60 50 Draw a line on the thermometer in the circle to show the highest tempe
June 2025, Chemistry Paper 4 Foundation, Q15(b)(i) (1 mark): Describe how the highest temperature changes as the reactivity of the metals increases. [1]
June 2025, Chemistry Paper 4 Foundation, Q15(b)(ii) (1 mark): The student repeats the experiment with another metal from the reactivity series shown above. The highest temperature measured is 49 °C. Suggest the name of thi
June 2025, Chemistry Paper 4 Foundation, Q15(c)(i) (3 marks): Calculate the mean highest temperature. Give your answer to 2 significant figures. Mean highest temperature = °C [3]
June 2025, Chemistry Paper 4 Foundation, Q15(c)(ii) (1 mark): Describe one variable the student must control when they repeat this experiment. [1]
June 2025, Chemistry Paper 4 Foundation, Q15(d) (1 mark): The student thinks that the highest temperatures are lower than they should be. Suggest one improvement the student could make so the highest temperatures are m
June 2025, Chemistry Paper 4 Foundation, Q16(b) (2 marks): Describe a test and its result which shows that the gas produced in the reaction is oxygen. Test Result [2]
June 2025, Chemistry Paper 9 Higher, Q5 (1 mark): Which statement about how Mendeleev arranged his version of the Periodic Table is incorrect? A He arranged elements in order of atomic number. B He arranged ele
June 2025, Chemistry Paper 9 Higher, Q15(d)(i) (1 mark): Which chemical in the equation turns the solution cloudy white? [1]
June 2025, Chemistry Paper 9 Higher, Q15(d)(ii) (1 mark): What is the alternative name for the calcium hydroxide solution? [1]
June 2025, Chemistry Paper 10 Higher, Q10 (1 mark): Which statement explains why zinc, Zn, is more reactive than iron, Fe? A Fe atoms form negative ions more easily than Zn atoms. B Fe atoms lose electrons more e
June 2025, Chemistry Paper 10 Higher, Q11(b) (2 marks): Describe a test and its result which shows that the gas produced in the reaction is oxygen. Test Result [2]
June 2025, Chemistry Paper 10 Higher, Q13(a) (1 mark): What are the elements in Group 7 called? Tick (✓) one box. The alkali metals The halogens The noble gases [1]
June 2025, Chemistry Paper 10 Higher, Q13(b) (1 mark): Why is chlorine found in Group 7 of the Periodic Table? Use ideas about electron arrangement. [1]
June 2025, Chemistry Paper 10 Higher, Q13(c)(i) (1 mark): What is the name of the white solid made in the reaction? [1]
June 2025, Chemistry Paper 10 Higher, Q13(c)(ii) (1 mark): A student thinks that the experiment is unsafe. How could the experiment be improved to make it safe? [1]
June 2025, Chemistry Paper 10 Higher, Q13(d)(i) (1 mark): Describe how the reactivity of the Group 7 elements changes going down the group. Use the Periodic Table. [1]
June 2025, Chemistry Paper 10 Higher, Q13(d)(ii) (1 mark): Which of the elements X, Y or Z is chlorine? [1]
June 2025, Chemistry Paper 10 Higher, Q13(d)(iii) (2 marks): Which statements about the reactivity of the Group 7 elements are true, and which are false? Tick (✓) one box in each row. The reactivity of the Group 7 element
June 2024, Chemistry Paper 3 Foundation, Q3 (1 mark): Which gas turns limewater cloudy? A Carbon dioxide B Chlorine C Hydrogen D Oxygen Your answer [1]
June 2024, Chemistry Paper 3 Foundation, Q11(c)(i) (1 mark): Which property did Mendeleev use to arrange the elements in his Periodic Table? Tick (3) one box. Atomic number Atomic size Atomic weight [1]
June 2024, Chemistry Paper 3 Foundation, Q11(c)(ii) (1 mark): Give one reason why Mendeleev left gaps in his Periodic Table. [1]
June 2024, Chemistry Paper 3 Foundation, Q11(c)(iii) (1 mark): Elements from which Group(s) are present in both Mendeleev’s Periodic Table and the modern Periodic Table? Use the Periodic Table on the Data Sheet. Tick (3) on
June 2024, Chemistry Paper 3 Foundation, Q17(a) (1 mark): Explain how the positions of lithium and oxygen in the Periodic Table are used to decide that lithium is a metal and oxygen is a non-metal. Use the Periodic Tab
June 2024, Chemistry Paper 3 Foundation, Q17(e) (1 mark): A student thinks that sodium reacts in a similar way to lithium. Explain why they are correct. Use the Periodic Table on the Data Sheet. [1]
June 2024, Chemistry Paper 4 Foundation, Q7 (1 mark): A student adds some metals to different solutions. The table shows their results. Metal Solution Reaction Key: 3 = reaction Copper nickel sulfate 7 7 = no react
June 2024, Chemistry Paper 4 Foundation, Q8 (1 mark): Four different metals are placed into dilute hydrochloric acid. Which metal forms positive ions most easily? Metal A Metal B Metal C Metal D Your answer [1]
June 2024, Chemistry Paper 4 Foundation, Q10 (1 mark): A teacher investigates some reactions of chlorine. Why is it important that the teacher does not breathe in chlorine? A Chlorine is highly flammable. B Chlorine
June 2024, Chemistry Paper 4 Foundation, Q12(a) (3 marks): What are the properties of the elements in Group 1, Group 7 and Group 0? Tick (3) one, two or three boxes in each row in Table 12.1. Table 12.1 Properties Group
June 2024, Chemistry Paper 4 Foundation, Q12(b) (2 marks): A teacher does an experiment to show that the order of reactivity going down Group 1 is: Lithium reactivity increases Sodium Potassium • The teacher has pieces
June 2024, Chemistry Paper 4 Foundation, Q12(c) (2 marks): The teacher also does an experiment to show that the order of reactivity going down Group 7 is: Chlorine reactivity decreases Bromine Iodine They react gases of
June 2024, Chemistry Paper 4 Foundation, Q12(d)(i) (1 mark): Describe what happens to the boiling points going from helium to xenon. [1]
June 2024, Chemistry Paper 4 Foundation, Q12(d)(ii) (1 mark): Estimate the boiling point of argon. Use the information in Table 12.4. [1]
June 2024, Chemistry Paper 9 Higher, Q11(a) (1 mark): Explain how the positions of lithium and oxygen in the Periodic Table are used to decide that lithium is a metal and oxygen is a non-metal. Use the Periodic Tab
June 2024, Chemistry Paper 9 Higher, Q11(e) (1 mark): A student thinks that sodium reacts in a similar way to lithium. Explain why they are correct. Use the Periodic Table on the Data Sheet. [1]
June 2024, Chemistry Paper 9 Higher, Q13 (6 marks): 13* A student has samples of three solids labelled A, B and C. They think: • A is calcium carbonate • B is sodium carbonate • C is sodium chloride. They know th
June 2024, Chemistry Paper 10 Higher, Q2 (1 mark): A teacher investigates some reactions of chlorine. Why is it important that the teacher does not breathe in chlorine? A Chlorine is highly flammable. B Chlorine
June 2024, Chemistry Paper 10 Higher, Q14(a) (1 mark): Calculate the lowest initial temperature of the copper sulfate solution. Lowest initial temperature = °C [1]
June 2024, Chemistry Paper 10 Higher, Q14(b) (1 mark): Use the student’s results to list the metals in the order of reactivity obtained by the student. Most reactive Least reactive [1]
June 2024, Chemistry Paper 10 Higher, Q14(c)(i) (1 mark): The student thinks that the error could be because they added incorrect masses of each metal. What piece of equipment could the student use to get a more accura
June 2024, Chemistry Paper 10 Higher, Q14(c)(ii) (2 marks): Another student thinks that the error could be because the iron powder used is old and its surface has been oxidised. Describe and explain how this oxidation co
June 2024, Chemistry Paper 10 Higher, Q14(d) (2 marks): The balanced symbol equation for the reaction between magnesium and copper sulfate solution is: Mg(s) + CuSO4(aq) MgSO4(aq) + Cu(s) The reaction can be written
June 2024, Chemistry Paper 10 Higher, Q17(a) (2 marks): Describe and explain the trend in the diameter of atoms of the elements in Group 1. [2]
June 2024, Chemistry Paper 10 Higher, Q17(b) (1 mark): Rubidium is the element below potassium in Group 1. Predict the diameter of atoms of rubidium. [1]
June 2024, Chemistry Paper 10 Higher, Q17(c) (4 marks): Describe and explain how the diameter of the atoms affects the reactivity of the elements in Group 1. [4]
June 2023, Chemistry Paper 3 Foundation, Q11(d) (1 mark): Which test is used to identify chlorine? Tick (3) one box. It goes ‘pop’ when lit. It relights a glowing splint. It turns limewater cloudy white. It turns damp
June 2023, Chemistry Paper 4 Foundation, Q1 (1 mark): Which part of the Periodic Table contains the most reactive metals? D A C B Your answer [1]
June 2023, Chemistry Paper 4 Foundation, Q3 (1 mark): The list is part of the reactivity series of metals. Calcium most reactive Magnesium Zinc Lead least reactive The diagram shows these four metals reacting with
June 2023, Chemistry Paper 4 Foundation, Q6 (1 mark): The table shows the boiling points of three Group 1 elements. Element Boiling point (°C) caesium 669 potassium 760 rubidium 686 How many of these elements are g
June 2023, Chemistry Paper 4 Foundation, Q8 (1 mark): Which particles do atoms in Group 7 gain when they react? A Electrons B Ions C Neutrons D Protons Your answer [1]
June 2023, Chemistry Paper 4 Foundation, Q11(b) (1 mark): The reaction of a very reactive metal. [1]
June 2023, Chemistry Paper 4 Foundation, Q11(c) (1 mark): The reaction of a green gas. [1]
June 2023, Chemistry Paper 4 Foundation, Q11(d) (1 mark): The reaction where a more reactive metal displaces a less reactive metal. [1]
June 2023, Chemistry Paper 4 Foundation, Q13(a) (1 mark): Complete the bar chart to show the melting point of sodium. [1] 200 150 Melting point 100 (°C) 50 0 Lithium Sodium Potassium Metal
June 2023, Chemistry Paper 4 Foundation, Q13(b) (2 marks): State and explain which of the metals lithium, sodium or potassium is the softest. Use information from Table 13.1. Metal Reason [2]
June 2023, Chemistry Paper 4 Foundation, Q13(c)(i) (1 mark): Complete Table 13.2 by estimating the times for lithium and potassium surfaces to go dull. Table 13.2 Metal Time for freshly cut surface to go dull (s) lithium
June 2023, Chemistry Paper 4 Foundation, Q13(c)(ii) (2 marks): Lithium, sodium and potassium are stored in oil to prevent them reacting with gases in the air. Which gases in the air react with lithium, sodium and potassium?
June 2023, Chemistry Paper 9 Higher, Q3 (1 mark): Which gas bleaches damp litmus paper? A Carbon dioxide B Chlorine C Hydrogen D Oxygen Your answer [1]
June 2023, Chemistry Paper 10 Higher, Q2 (1 mark): Which row correctly describes the Group 0 elements? Physical state at 25 °C Reactivity A gas very reactive B gas very unreactive C liquid very reactive D liquid
June 2023, Chemistry Paper 10 Higher, Q3 (1 mark): A small piece of a Group 1 metal is added to a trough of water. The metal floats, fizzes vigorously and melts to form a silvery ball. Which Group 1 metal was ad
June 2023, Chemistry Paper 10 Higher, Q8 (1 mark): When a solution of bromine, Br2(aq), is mixed with a solution of sodium chloride, NaCl (aq), there is no reaction. Why is there no reaction? A Bromine gains ele
June 2023, Chemistry Paper 10 Higher, Q14 (6 marks): 14* Magnesium, calcium and strontium are metals in Group 2 of the Periodic Table. Tables 14.1 and 14.2 show some information about these metals. Table 14.1 Reac
June 2023, Chemistry Paper 10 Higher, Q15(c) (1 mark): In Stage 3 if the solution is heated for too long, iodine vapour is formed. What colour is iodine vapour? [1]
June 2022, Chemistry Paper 3 Foundation, Q2 (1 mark): What is the test for oxygen gas? A It goes ‘pop’ when lit. B It relights a glowing splint. C It turns damp red litmus paper blue. D It turns limewater cloudy. Y
June 2022, Chemistry Paper 3 Foundation, Q12(d)(i) (1 mark): Which two elements are in Group 1 of the Periodic Table? Elements = and [1]
June 2022, Chemistry Paper 3 Foundation, Q12(d)(ii) (1 mark): Which element is in Period 4 of the Periodic Table? Element = [1]
June 2022, Chemistry Paper 4 Foundation, Q2 (1 mark): A student heats four different metals using a Bunsen burner. The table shows their observations. Metal Observation when metal is heated W bursts into flames X s
June 2022, Chemistry Paper 4 Foundation, Q11(d)(ii) (1 mark): What is a property of the Group 0 gases? Tick (3) one box. They are coloured. They are unreactive. They exist as molecules. [1]
June 2022, Chemistry Paper 4 Foundation, Q12(a)(i) (1 mark): The student writes the word equation for the reaction. iron + copper sulfate + Complete the word equation for the reaction. [1]
June 2022, Chemistry Paper 4 Foundation, Q12(a)(ii) (1 mark): Why does this reaction happen? Use the reactivity series in Fig. 12.1. [1] Use the reactivity series in Fig. 12.1 to answer parts (b), (c) and (d).
June 2022, Chemistry Paper 4 Foundation, Q12(b) (1 mark): Another student repeats the experiment but places a different metal in the solution of copper sulfate. There is no chemical reaction. Suggest a metal that this
June 2022, Chemistry Paper 4 Foundation, Q12(d) (1 mark): Complete the sentence below to explain the difference in the reactivity of sodium and lithium. Use one of the words. electrons neutrons protons Sodium atoms los
June 2022, Chemistry Paper 4 Foundation, Q12(e)(i) (1 mark): State the trend in reactivity of the Group 1 metals. [1]
June 2022, Chemistry Paper 4 Foundation, Q12(e)(ii) (1 mark): Name a Group 1 metal which is more reactive than sodium. [1]
June 2022, Chemistry Paper 4 Foundation, Q16(a) (1 mark): Complete the table by predicting the appearance of astatine at room temperature. Write your answer in the box in Table 16.1. [1]
June 2022, Chemistry Paper 4 Foundation, Q16(b) (1 mark): The sizes of the molecules are measured in picometres (pm). 1 1 picometre = 1 000 000 000 000 metre What is the size of a fluorine molecule in metres (m)? Tick
June 2022, Chemistry Paper 4 Foundation, Q16(c) (1 mark): Which element has a molecule that is closest to twice the size of a molecule of fluorine? Tick (3) one box. Chlorine Bromine Iodine Astatine [1]
June 2022, Chemistry Paper 4 Foundation, Q16(d)(i) (4 marks): Use Table 16.1 to complete the x axis and plot a line graph of the boiling points of fluorine, chlorine, iodine and astatine against the size of their molecules
June 2022, Chemistry Paper 4 Foundation, Q16(d)(ii) (1 mark): Use your graph to predict the boiling point of bromine. Boiling point of bromine = °C [1] Table 16.1 is repeated below. Table 16.1 Element Molecular Appearance
June 2022, Chemistry Paper 4 Foundation, Q16(e) (2 marks): A student thinks that fluorine molecules have the weakest intermolecular forces. Give two reasons why they are correct. Use data from Table 16.1. 1 2 [2]
June 2022, Chemistry Paper 4 Foundation, Q16(f) (2 marks): Describe one similarity and one difference in the arrangement of electrons in atoms of fluorine and chlorine. Similarity Difference [2]
June 2022, Chemistry Paper 9 Higher, Q7 (1 mark): The ionic equation shows the reaction of chlorine, Cl 2, with sodium bromide, NaBr. Cl 2 + 2Na+ + 2Br – Br2 + 2Na+ + 2Cl – What is the simplest ionic equation f
June 2022, Chemistry Paper 9 Higher, Q12(a) (1 mark): Explain why potassium is found in Group 1 of the Periodic Table. Use ideas about the arrangement of electrons in an atom of potassium. [1]
June 2022, Chemistry Paper 9 Higher, Q13 (6 marks): 13* Hydrogen can form compounds with the Group 7 elements. These compounds are simple covalent molecules. For example, hydrogen + chlorine hydrogen chloride H2
June 2022, Chemistry Paper 9 Higher, Q14(c)(ii) (1 mark): A solution of calcium hydroxide is also called limewater. Name the gas limewater is used as a test for. [1]
June 2022, Chemistry Paper 10 Higher, Q9 (1 mark): Look at the diagram of the Periodic Table. W X Y Z Which elements react with dilute hydrochloric acid to form positive ions? A W and X B W and Y C X and Y D X a
June 2022, Chemistry Paper 10 Higher, Q11(a) (1 mark): Complete the table by predicting the appearance of astatine at room temperature. Write your answer in the box in Table 11.1. [1]
June 2022, Chemistry Paper 10 Higher, Q11(b) (1 mark): The sizes of the molecules are measured in picometres (pm). 1 1 picometre = 1 000 000 000 000 metre What is the size of a fluorine molecule in metres (m)? Tick
June 2022, Chemistry Paper 10 Higher, Q11(c) (1 mark): Which element has a molecule that is closest to twice the size of a molecule of fluorine? Tick (✓) one box. Chlorine Bromine Iodine Astatine [1]
June 2022, Chemistry Paper 10 Higher, Q11(d)(i) (4 marks): Use Table 11.1 to complete the x axis and plot a line graph of the boiling points of fluorine, chlorine, iodine and astatine against the size of their molecules
June 2022, Chemistry Paper 10 Higher, Q11(d)(ii) (1 mark): Use your graph to predict the boiling point of bromine. Boiling point of bromine = °C [1] Table 11.1 is repeated below. Table 11.1 Element Molecular Appearance
June 2022, Chemistry Paper 10 Higher, Q11(e) (2 marks): A student thinks that fluorine molecules have the weakest intermolecular forces. Give two reasons why they are correct. Use data from Table 11.1. 1 2 [2]
June 2022, Chemistry Paper 10 Higher, Q11(f) (2 marks): Describe one similarity and one difference in the arrangement of electrons in atoms of fluorine and chlorine. Similarity Difference [2]
June 2022, Chemistry Paper 10 Higher, Q15(a) (1 mark): Give a reason why the Group 0 elements are usually described as unreactive. [1]
June 2022, Chemistry Paper 10 Higher, Q15(b) (1 mark): Give a reason why scientists have used fluorine to make compounds of the Group 0 elements. [1]
June 2022, Chemistry Paper 10 Higher, Q15(c)(i) (1 mark): Suggest the structure of xenon difluoride, XeF2. [1]
June 2022, Chemistry Paper 10 Higher, Q15(c)(ii) (2 marks): Give two reasons for your answer in (c)(i). 1 2 [2]
June 2022, Chemistry Paper 10 Higher, Q15(d) (1 mark): Describe how the trend in reactivity of the Group 0 elements is linked to the size of the atoms. [1]
November 2021, Chemistry Paper 3 Foundation, Q1 (1 mark): In the Periodic Table elements are arranged in Groups and Periods. Look at the diagram. It shows four elements. Be C Kr Ca Which element is in Group 2 and Perio
November 2021, Chemistry Paper 3 Foundation, Q16 (6 marks): 16* Helium and neon are the first two elements in Group 0 of the Periodic Table. Look at the symbols for helium and neon. 2 10 He Ne 4 20 Describe the similarit
November 2021, Chemistry Paper 4 Foundation, Q2 (1 mark): The table shows information about four different elements. Description of element Description of reactivity at room temperature A colourless gas reactive B pale
November 2021, Chemistry Paper 4 Foundation, Q5 (1 mark): Which statement about the Group 0 elements is correct? A They exist as simple molecules. B They exist as single atoms. C They react to form giant covalent molec
November 2021, Chemistry Paper 4 Foundation, Q8 (1 mark): Sodium reacts with water to form sodium hydroxide and hydrogen. What is the correctly balanced symbol equation for this reaction? A Na(s) + H2O(l) NaOH(aq) + H2
November 2021, Chemistry Paper 4 Foundation, Q11(a) (1 mark): How many outer shell electrons are there in an atom of tennessine? Put a ring around the correct answer. 1 7 17 [1]
November 2021, Chemistry Paper 4 Foundation, Q11(b) (1 mark): What is the reactivity of tennessine compared to astatine? Put a ring around the correct answer. less reactive more reactive the same [1]
November 2021, Chemistry Paper 4 Foundation, Q11(c) (1 mark): What is the physical state of tennessine at room temperature? Put a ring around the correct answer. gas liquid solid [1]
November 2021, Chemistry Paper 4 Foundation, Q11(d) (1 mark): What is the melting point of tennessine compared to astatine? Put a ring around the correct answer. higher lower the same [1]
November 2021, Chemistry Paper 4 Foundation, Q12(a) (1 mark): A teacher adds a small piece of a Group 1 metal to a trough of water, as shown in Fig. 12.1. Small piece of Group 1 metal Glass trough Water Fig. 12.1 The metal
November 2021, Chemistry Paper 4 Foundation, Q12(b)(i) (1 mark): Which gas in the air reacts with the sodium as it goes dull? [1]
November 2021, Chemistry Paper 4 Foundation, Q12(b)(ii) (1 mark): What is the name of the chemical compound made as the sodium goes dull? [1]
November 2021, Chemistry Paper 4 Foundation, Q12(b)(iii) (2 marks): How long would it take a piece of freshly cut lithium to go dull compared to sodium? Give a reason for your answer. [2]
November 2021, Chemistry Paper 4 Foundation, Q12(c) (2 marks): Fig. 12.2 shows the trend in the density of the Group 1 metals from lithium to caesium. 2 Density 1 (g / cm3) 0 Lithium Sodium Potassium Rubidium Caesium Fig. 1
November 2021, Chemistry Paper 10 Higher, Q4 (1 mark): The table shows some information about the Group 7 elements. Group 7 element Melting point (°C) Boiling point (°C) fluorine −220 −188 chlorine −101 −34 bromine
November 2021, Chemistry Paper 10 Higher, Q9 (1 mark): Silver, Ag, does not react with dilute hydrochloric acid, HCl. Which statement is the correct explanation for this? A Silver forms negative ions less easily tha
November 2021, Chemistry Paper 10 Higher, Q13(a) (1 mark): When potassium is added to cold water it melts and moves very quickly across the surface of the water. Write down one other observation when potassium is added
November 2021, Chemistry Paper 10 Higher, Q13(b) (2 marks): Complete Table 13.1 for rubidium. [2]
November 2021, Chemistry Paper 10 Higher, Q13(c) (1 mark): Explain, in terms of electron loss or gain, the difference between lithium and sodium when they react with cold water. [1]
November 2021, Chemistry Paper 10 Higher, Q13(d) (2 marks): Table 13.2 shows the density of the Group 1 metals from lithium to caesium. Density Group 1 metal (g / cm3) lithium 0.53 sodium 0.97 potassium 0.86 rubidium 1.5
November 2020, Chemistry Paper 3 Foundation, Q11(b) (2 marks): Explain why magnesium is found in Group 2 and Period 3 of the Periodic Table. Use Fig. 11.1 to help you. 12]
November 2020, Chemistry Paper 3 Foundation, Q12(f)(ii) (2 marks): Describe the test and result for the gas named in (f)(i). Test Result [2]
November 2020, Chemistry Paper 3 Foundation, Q15 (4 marks): Mendeleev published a Periodic Table in 1871. 15 Look at the diagram. It shows a version of Mendeleev's Periodic Table. Group 5 Group 1 Group 2 Group 3 Group 4
November 2020, Chemistry Paper 4 Foundation, Q1 (1 mark): Look at the diagram of the Periodic Table. C D Which element A, B, C or D, is a reactive metal? 11] Your answer
November 2020, Chemistry Paper 4 Foundation, Q4 (1 mark): A teacher places a small piece of metal into a test tube of water. The metal floats and fizzes on the surface of the water. What is the name of the metal? A Cop
November 2020, Chemistry Paper 4 Foundation, Q10 (1 mark): The table shows the boiling points of the first five Group 0 elements. 10 Element Boiling point (°C) Helium -269 -246 Neon -186 Argon Krypton -152 Xenon -107 Wh
November 2020, Chemistry Paper 4 Foundation, Q12(a) (3 marks): The elements in Group 7 have different physical properties at room temperature. Draw a line to connect each Group 7 element with its correct description. Descri
November 2020, Chemistry Paper 4 Foundation, Q12(b)(i) (2 marks): Use these words to complete the sentences. You can use each word once, more than once, or not at all. chlorine electrons astatine bromine protons fluorine ions
November 2020, Chemistry Paper 4 Foundation, Q12(b)(ii) (1 mark): State why the elements in Group 7 have similar chemical properties. . [1]
November 2020, Chemistry Paper 4 Foundation, Q12(c) (3 marks): The diagram shows the arrangement of electrons in an atom of neon. How reactive is neon? Explain your answer. Use ideas about electrons in your answer. ..[3]
November 2020, Chemistry Paper 4 Foundation, Q16 (6 marks): The diagram shows the reaction of a metal with dilute hydrochloric acid. 16 Dilute hydrochloric acid - Metal A student thinks she can use this reaction to place
November 2020, Chemistry Paper 10 Higher, Q2 (1 mark): The table shows the boiling points of the first five Group 0 elements. Element Boiling point (°C) Helium −269 Neon −246 Argon −186 Krypton −152 Xenon −107 Which
November 2020, Chemistry Paper 10 Higher, Q10 (1 mark): Look at the diagram of the Periodic Table. A B C D Which element, A, B, C or D, has the greatest tendency to form positive ions when it reacts with dilute hydro
November 2020, Chemistry Paper 10 Higher, Q14(a)(i) (3 marks): Plot the data in Table 14.1 on the grid in Fig. 14.1. Draw a line of best fit. Melting point (°C) Atomic number Fig. 14.1 [3]
November 2020, Chemistry Paper 10 Higher, Q14(a)(ii) (1 mark): Describe the relationship between the atomic number of the Group 1 metals and their melting points shown in Fig. 14.1. [1]
November 2020, Chemistry Paper 10 Higher, Q18(a) (2 marks): Write the balanced symbol equation for the reaction between potassium bromide, KBr, and chlorine, Cl2. [2]
November 2020, Chemistry Paper 10 Higher, Q18(b) (1 mark): Write down the name of the chemical which makes the solution orange. [1]
November 2020, Chemistry Paper 10 Higher, Q18(d) (3 marks): Explain why chlorine is more reactive than bromine. [3]
June 2019, Chemistry Paper 3 Foundation, Q3 (1 mark): A student tests which gas is produced in a reaction using a glowing splint. The gas re-lights the glowing splint. What is the name of the gas? A Carbon dioxide
June 2019, Chemistry Paper 3 Foundation, Q6 (1 mark): Fluorine is in Group 7 of the Periodic Table. Which statement best describes fluorine? A It has a full outer shell of electrons B It is a metal C It is a non-me
June 2019, Chemistry Paper 3 Foundation, Q11(c) (1 mark): Look at this statement about the Periodic Table. ‘Atoms are placed in groups according to the total number of electrons they have.’ Explain why this statement i
June 2019, Chemistry Paper 4 Foundation, Q4 (1 mark): This is part of the reactivity series. Tin more reactive Lead Copper Silver less reactive Which statement is correct? A Copper can displace tin from tin chlorid
June 2019, Chemistry Paper 4 Foundation, Q5 (1 mark): Which row of the table describes Group 1 and Group 7 elements? Group 1 elements Group 7 elements A metals with low melting points metals with high melting point
June 2019, Chemistry Paper 4 Foundation, Q8 (1 mark): Some metals react faster with an acid than others. Which statement explains why? A The acid gives off hydrogen atoms more easily. B The acid gives off hydrogen
June 2019, Chemistry Paper 4 Foundation, Q9 (1 mark): The elements neon and argon in Group 0 are unreactive. Which statement explains why? A These elements have 8 electrons in the nucleus. B These elements have 8 e
June 2019, Chemistry Paper 4 Foundation, Q11(a)(i) (1 mark): Name element D. [1]
June 2019, Chemistry Paper 4 Foundation, Q11(a)(ii) (1 mark): A teacher shows this reaction to his class. Describe one safety precaution he should use. [1]
June 2019, Chemistry Paper 4 Foundation, Q11(a)(iii) (2 marks): E is a colourless gas. How can you show if the gas is hydrogen or oxygen? Describe the tests for hydrogen and oxygen, and the results you would expect with gas
June 2019, Chemistry Paper 4 Foundation, Q11(a)(iv) (1 mark): Group 1 elements are very reactive. Write down the reason why. [1]
June 2019, Chemistry Paper 4 Foundation, Q11(b)(i) (2 marks): Calculate how many times larger the density of rubidium is than the density of lithium. Give your answer to 1 significant figure. Number of times larger = [2]
June 2019, Chemistry Paper 4 Foundation, Q11(b)(ii) (1 mark): 1 g of sodium and 1 g of potassium are mixed to form an alloy. Calculate the density of the alloy. Density = g / cm3 [1]
June 2019, Chemistry Paper 4 Foundation, Q11(b)(iii) (1 mark): The element caesium (Cs) is also in Group 1. Caesium is found below rubidium in the Periodic Table. Use the information in Table 11.1 and your knowledge of tren
June 2019, Chemistry Paper 4 Foundation, Q11(c)(iii) (2 marks): What does the reaction tell you about the reactivity of Br2 and Cl 2? Explain your answer. [2]
June 2019, Chemistry Paper 9 Higher, Q3 (1 mark): How are atoms arranged in the modern Periodic Table? A In order of atomic number B In order of relative atomic mass C In order of the number of neutrons D In or
June 2019, Chemistry Paper 10 Higher, Q3 (1 mark): Element W displaces X from a solution of X nitrate. Element X displaces Y from a solution of Y sulfate. Element Z displaces W from a solution of W nitrate. What
June 2019, Chemistry Paper 10 Higher, Q8 (1 mark): This question is about the elements in Group 1. Which row of the table is correct? Reactivity Reason A decreases down the group it is easier to form positive io
June 2019, Chemistry Paper 10 Higher, Q9 (1 mark): The elements neon and argon in Group 0 are unreactive. Which statement explains why? A They all have eight electrons in their outer shells. B They all have full
June 2019, Chemistry Paper 10 Higher, Q14(a) (1 mark): Identify element A. [1]
June 2019, Chemistry Paper 10 Higher, Q14(b)(i) (1 mark): Identify compound B. [1]
June 2019, Chemistry Paper 10 Higher, Q14(b)(ii) (2 marks): Write a balanced equation for the reaction of element A with Br2(l). Include state symbols in your answer. [2]
June 2019, Chemistry Paper 10 Higher, Q14(c)(i) (1 mark): Identify compound C. [1]
June 2019, Chemistry Paper 10 Higher, Q14(d) (3 marks): D is a colourless gas. How can you show if the gas is carbon dioxide, hydrogen or oxygen? Describe the tests for carbon dioxide, hydrogen and oxygen and the res
June 2018, Chemistry Paper 3 Foundation, Q15(a) (2 marks): The electronic structure of phosphorus is 2.8.5. Use these three numbers to explain the position of phosphorus in the Periodic Table. [2]
June 2018, Chemistry Paper 4 Foundation, Q3 (1 mark): Look at the table. State at room temperature Electronic structure A Gas 2.7 B Gas 2.8.7 C Liquid 2.8.7 D Solid 2.7 Which row in the table has the correct inform
June 2018, Chemistry Paper 4 Foundation, Q7 (1 mark): The Group 0 elements are unreactive. Why are they unreactive? A They all exist as single atoms. B They are all gases. C They have a full outer electron shell. D
June 2018, Chemistry Paper 4 Foundation, Q8 (1 mark): Look at the boiling points of some Group 7 elements. Element Boiling point in °C Fluorine −188 Chlorine −34 Bromine 59 What is the most likely boiling point of
June 2018, Chemistry Paper 4 Foundation, Q14(a) (4 marks): Use the results to place the metals in order of reactivity. Most reactive metal Least reactive metal Explain your reasoning. [4]
June 2018, Chemistry Paper 4 Foundation, Q14(b) (1 mark): Write a word equation for the reaction between copper and silver nitrate solution. [1]
June 2018, Chemistry Paper 4 Foundation, Q16 (6 marks): 16* Look at the information about three elements X, Y and Z in the Periodic Table. Element X Y Z Atomic number Less than 11 11 More than 11 Melting point (°C) 1
June 2018, Chemistry Paper 9 Higher, Q3 (1 mark): The element astatine, At, is below iodine in Group 7. Which prediction about astatine is correct? A Astatine is a gas. B Astatine is more reactive than iodine.
June 2018, Chemistry Paper 10 Higher, Q4 (1 mark): Fluorine is the most reactive element in Group 7 (Group 17). Why? A Fluorine atoms gain an electron more readily than the other Group 7 elements. B Fluorine is
June 2018, Chemistry Paper 10 Higher, Q6 (1 mark): Magnesium is a more reactive metal than copper. Why? A Copper forms positive ions more readily than magnesium. B Copper is higher in the reactivity series than
June 2018, Chemistry Paper 10 Higher, Q7 (1 mark): Which of these solutions will react with each other? A Sodium bromide and iodine B Sodium chloride and bromine C Sodium chloride and iodine D Sodium iodide and
June 2018, Chemistry Paper 10 Higher, Q8 (1 mark): Which statement about the halogens (Group 7 elements) is correct? A Astatine is the most reactive halogen. B Chlorine has the electronic structure 2.8.7. C Fluo
June 2018, Chemistry Paper 10 Higher, Q16(a) (6 marks): Look at the information about three elements X, Y and Z in the Periodic Table. Element X Y Z Atomic number Less than 11 11 More than 11 Melting point (°C) 181 9
June 2018, Chemistry Paper 10 Higher, Q16(b) (2 marks): Write a balanced symbol equation for the reaction of element Y with water. Use ‘Y’ to represent element Y. [2]

Questions, mark schemes and examiner’s reports are © OCR, from their published past papers. Plumi isn’t affiliated with any exam board. Want whole papers? Full past papers.

Rather write your answers by hand on iPad? Plumi marks them against the same mark schemes.

3,411 questions