plumiBonding and structure: OCR A‑Level Chemistry B questions
Every OCR A-Level Chemistry B exam question on EL Bonding and structure (specification points EL(i)–(l)), 2016–2025, with its mark scheme and examiner’s report.
Find questions2,049
Calculations
Q31(a)
The whole paper ↗![June 2025 Paper 1, question 31(a): Oleic acid contains a carboxylic acid group, COOH. Name and explain the shape around the carbon atom in the carboxylic acid group. [3]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43301-jun25-31-a-qp.webp?v=3)
Q2(g)
The whole paper ↗
Q1(d)
The whole paper ↗![June 2025 Paper 3, question 1(d): Calcium and potassium are in the same period of the periodic table. Explain why calcium has the higher melting point. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43303-jun25-01-d-qp.webp?v=3)
Q5(b)(i)
The whole paper ↗![June 2024 Paper 2, question 5(b)(i): Draw a ‘dot-and-cross’ diagram for an H2O2 molecule. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun24-05-bi-qp.webp?v=3)
Q5(b)(ii)
The whole paper ↗![June 2024 Paper 2, question 5(b)(ii): Explain why the H-O-O bond angle in H2O2 is less than 109.5°. Use your diagram from (b)(i). [3]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun24-05-bii-qp.webp?v=3)
Q3(c)
The whole paper ↗
Q1(a)
The whole paper ↗
Q3(e)(i)
The whole paper ↗![June 2024 AS Paper 2, question 3(e)(i): State and explain the C–O–H bond angle in a methanol molecule. C–O–H bond angle = ° Explanation of bond angle. [4]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03302-jun24-03-ei-qp.webp?v=3)
![June 2023 Paper 1, question 9: Which of the following molecules is linear? A HCN B H2S C NO2 D SO2 Your answer [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43301-jun23-09-qp.webp?v=3)
Q5(a)
The whole paper ↗![June 2023 Paper 2, question 5(a): A diagram of the structure of calcium carbide is shown below. Label a cation and an anion to show how the ions are arranged in the structure. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun23-05-a-qp.webp?v=3)
Q5(e)(i)
The whole paper ↗![June 2023 Paper 2, question 5(e)(i): Complete a ‘dot-and-cross’ diagram for cyanamide. H H N C N [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun23-05-ei-qp.webp?v=3)
Q5(e)(ii)
The whole paper ↗![June 2023 Paper 2, question 5(e)(ii): Suggest, with reasons, the bond angle for N–C–N in cyanamide. [3]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun23-05-eii-qp.webp?v=3)
Q3(e)
The whole paper ↗
![June 2022 Paper 1, question 4: What is the correct bond angle in the ammonia molecule? A 90° B 107° C 109° D 120° Your answer [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43301-jun22-04-qp.webp?v=3)
All 59 questions on Bonding and structure, as a list
- June 2025, Paper 1, Q11 (1 mark): Which statement about all sodium compounds is correct? A They are less reactive than potassium compounds. B They dissolve in water to give alkaline solutions. C
- June 2025, Paper 1, Q31(a) (3 marks): Oleic acid contains a carboxylic acid group, COOH. Name and explain the shape around the carbon atom in the carboxylic acid group. [3]
- June 2025, Paper 2, Q2(g) (6 marks): Some students study the nitrogen compounds in the soil. – ion can be represented as shown: (g)* An NO3 O– O N O – have the same shape and bond angles. A student
- June 2025, Paper 3, Q1(d) (2 marks): Calcium and potassium are in the same period of the periodic table. Explain why calcium has the higher melting point. [2]
- June 2025, AS Paper 1, Q6 (1 mark): A substance has a high melting point and is soluble in water. What is the structure type of the substance? A covalent network B ionic C metallic D simple molecu
- June 2024, Paper 2, Q5(b)(i) (1 mark): Draw a ‘dot-and-cross’ diagram for an H2O2 molecule. [1]
- June 2024, Paper 2, Q5(b)(ii) (3 marks): Explain why the H-O-O bond angle in H2O2 is less than 109.5°. Use your diagram from (b)(i). [3]
- June 2024, Paper 3, Q3(c) (5 marks): The table shows some properties of two compounds of chlorine, NaCl and PCl 3. NaCl PCl 3 Melting point / K 1074 161 Electrical conductivity good none when molte
- June 2024, AS Paper 1, Q2 (1 mark): SiO2 has a covalent network structure. What is correct for SiO2? A It consists of SiO2 molecules joined by strong intermolecular bonds. B It does not conduct el
- June 2024, AS Paper 2, Q1(a) (2 marks): Two models of the structure of sodium chloride are shown below in Fig. 1.1 and Fig. 1.2. Fig. 1.1 Na+ Cl – Fig. 1.2 Na+ Cl – The two models show different featu
- June 2024, AS Paper 2, Q3(e)(i) (4 marks): State and explain the C–O–H bond angle in a methanol molecule. C–O–H bond angle = ° Explanation of bond angle. [4]
- June 2023, Paper 1, Q1 (1 mark): Which row is correct for the properties of substances with the bonding types shown? Electrical conductivity Melting Bonding type point Solid Molten A covalent n
- June 2023, Paper 1, Q9 (1 mark): Which of the following molecules is linear? A HCN B H2S C NO2 D SO2 Your answer [1]
- June 2023, Paper 2, Q5(a) (2 marks): A diagram of the structure of calcium carbide is shown below. Label a cation and an anion to show how the ions are arranged in the structure. [2]
- June 2023, Paper 2, Q5(e)(i) (2 marks): Complete a ‘dot-and-cross’ diagram for cyanamide. H H N C N [2]
- June 2023, Paper 2, Q5(e)(ii) (3 marks): Suggest, with reasons, the bond angle for N–C–N in cyanamide. [3]
- June 2023, AS Paper 1, Q4 (1 mark): A solid substance has a high melting point and does not conduct electricity. Which type of structure does this substance have? A Ionic lattice B Metallic lattic
- June 2023, AS Paper 1, Q20 (1 mark): The model shown below represents part of a lattice of sodium chloride. Which statement is correct about the model shown? A Each line represents a shared pair of
- June 2023, AS Paper 2, Q3(e) (5 marks): Electron ‘dot-and-cross’ diagrams can be used to show the arrangements of electrons in molecules. Add dots and crosses to the diagram of phenylethanol below (wh
- June 2022, Paper 1, Q4 (1 mark): What is the correct bond angle in the ammonia molecule? A 90° B 107° C 109° D 120° Your answer [1]
- June 2022, Paper 1, Q31(a) (2 marks): Bromine is made from the sodium bromide present in sea water. Complete the table showing the structure, bonding and properties of bromine and sodium bromide. El
- June 2022, Paper 2, Q5(d) (1 mark): Name the shape around the N atom in the –NH3 [1]
- June 2022, AS Paper 1, Q3 (1 mark): Which row is correct for the properties of the solids shown? Electrical Solid Melting point conductivity A graphite high poor B iodine high poor C iron low good
- June 2022, AS Paper 1, Q11 (1 mark): Which molecule has the largest bond angle? A BF3 B CHF3 C NF3 D PF3 Your answer [1]
- June 2022, AS Paper 1, Q21(a)(ii) (2 marks): Draw a dot-and-cross diagram for vinyl chloride. [2]
- June 2022, AS Paper 2, Q4(c)(iii) (2 marks): There are two carbon-oxygen bonds listed in Table 4.1. Explain why the C=O double bond is shorter than the C–O single bond. [2]
- November 2021, Paper 1, Q27 (1 mark): What is correct about the structure shown below? oo H o P o H x x oΔ A The structure has a negative charge. B The structure has one lone pair. C The structure i
- November 2021, Paper 2, Q5(c)(i) (1 mark): State the H-O-H bond angle in a water molecule. [1]
- November 2021, Paper 2, Q5(c)(ii) (3 marks): Explain the bond angle in water. [3]
- November 2021, Paper 2, Q5(d) (3 marks): Ceramics and ‘gorilla glass’ are both strong in resisting compression. Which features of their chemical structures do they share and what does gorilla glass hav
- November 2021, Paper 3, Q3(c) (4 marks): The element iodine is much less soluble in water than potassium iodide, KI. State the structures of iodine and potassium iodide. Suggest why potassium iodide is
- November 2021, AS Paper 1, Q1 (1 mark): A compound has a high melting point and does not conduct electricity when solid or molten. What is the structure of the compound? A Giant covalent network B Gia
- November 2021, AS Paper 2, Q2(a)(iii) (1 mark): Sodium chloride, sodium bromide and sodium iodide have the same giant ionic lattice structures. Part of this giant lattice structure is shown in the diagram bel
- November 2020, Paper 2, Q3(a) (2 marks): The H2PO4 Draw a ‘dot-and-cross’ diagram for this ion. [2]
- November 2020, AS Paper 1, Q23(d) (5 marks): Sodium and sodium chloride are both solids at room temperature. Describe the structure and bonding in both solids. [5]
- June 2019, Paper 1, Q7 (1 mark): Which substance in the table has a giant ionic structure? Electrical Substance Melting point Solubility in water conductivity Conducts when solid A High Insolub
- June 2019, Paper 1, Q34(b) (3 marks): There is a theory that the molecules of life were formed from elements made in stars. These molecules came to Earth from space on comets. Recent analysis of com
- June 2019, Paper 2, Q1(b) (3 marks): Suggest the O=C−Cl bond angle in compound A. Explain your answer. [3]
- June 2019, Paper 2, Q2(f)(ii) (2 marks): Explain the difference in melting point. [2]
- June 2019, AS Paper 1, Q3 (1 mark): Which molecule has no lone pairs? A BeCl2 B CF4 C NH3 D BH3 Your answer [1]
- June 2019, AS Paper 2, Q3(d)(ii) (1 mark): Indium has the same structure and bonding as aluminium. Explain why indium conducts electricity. [1]
- June 2019, AS Paper 2, Q3(d)(iii) (1 mark): Indium forms an oxide that has a melting point of 1910 °C and conducts electricity in the molten state. Explain this high melting point in terms of the structur
- June 2019, AS Paper 2, Q3(e) (3 marks): A student is asked to predict and explain the shape of an InH3 molecule. The student writes, ‘Since the formula, InH3, is similar to ammonia, NH3, the shape mus
- June 2018, Paper 1, Q34(a) (1 mark): NO is a radical. Draw a ‘dot-and-cross’ diagram of NO and explain why it is called a radical. Show outer electron shells only. [1]
- June 2018, Paper 2, Q1(a)(ii) (2 marks): The diagram below shows the pattern of ions in one face of a NaCl lattice. Extend the diagram to show the repeating pattern by adding three more suitable ions.
- June 2018, Paper 2, Q4(b)(i) (2 marks): Draw a ‘dot-and-cross’ diagram for CO2 and use it to name the shape of the molecule. ‘Dot-and-cross’ diagram: Shape of molecule [2]
- June 2018, Paper 2, Q5(e)(i) (2 marks): Suggest a ‘dot-and-cross’ diagram for the anion in Scheele’s green. [2]
- June 2018, Paper 2, Q5(f) (4 marks): State and explain the C–As–C bond angle in trimethylarsine. [4]
- June 2018, AS Paper 1, Q19 (1 mark): Which statement about a lattice of sodium chloride is correct? A The ions are the same size. B The attraction between two sodium ions is greater than the repuls
- June 2018, AS Paper 1, Q22(c)(i) (2 marks): Draw a ‘dot-and-cross’ diagram of GaCl4 [2]
- June 2018, AS Paper 1, Q22(c)(ii) (1 mark): Name the shape of GaCl4 [1]
- June 2017, Paper 1, Q13 (1 mark): – ion? 13 What is the bond angle (in degrees) in the NH2 A 104.5° B 107° C 120° D 180° Your answer [1]
- June 2017, AS Paper 1, Q2 (1 mark): Which row could be correct for solids with the structure type named? Solubility in Electrical Structure type Melting point water conductivity A ionic high solub
- June 2017, AS Paper 1, Q15 (1 mark): What is correct about a sodium chloride lattice? A There are attractions between ions of different charge. B The sodium ions are larger than the chloride ions.
- June 2017, AS Paper 1, Q19 (1 mark): Which has the largest bond angle? A BF3 B CF4 C NF3 D OF2 Your answer [1]
- June 2017, AS Paper 1, Q24(b)(ii) (1 mark): Complete the ‘dot-and-cross’ diagram for ethyl ethanoate. H H H + + + + + + + C H C O C C H + + + H O H H [1]
- June 2017, AS Paper 1, Q24(b)(iii) (4 marks): State and explain the bond angle around the ester group carbon (shown in bold) in the structure above. [4]
- June 2017, AS Paper 2, Q2(b)(ii) (3 marks): State and explain the bond angle C. Bond angle C = ° Explanation [3]
- June 2016, AS Paper 1, Q13 (1 mark): Which molecule is linear in shape? A SO2 B H2S C CS2 Cl2O D Your answer [1]
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? Every OCR A-Level Chemistry B paper.
Rather write your answers by hand on iPad? Plumi marks them against the same mark schemes.