plumiElectronegativity and polar bonds and molecules: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 3.B.3 Electronegativity and polar bonds and molecules, 2019–2025, with mark schemes and examiner’s reports where available.
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All 23 questions on Electronegativity and polar bonds and molecules, as a list
- June 2025, AS Unit 1, Q7 (1 mark): Which of these molecules are polar? I hydrogen chloride, HCl(g) II beryllium chloride, BeCl2(g) III boron trichloride, BCl3(g) A I only B II and III C I and III
- January 2025, AS Unit 1, Q25(b)(i) (2 marks): State what is meant by the term polar molecule and why chlorine is not polar. (2)
- January 2025, AS Unit 1, Q26(f) (3 marks): SF4 and S2F10 are reactive, but SF6 is unreactive. Suggest reasons for this by considering the shape and bonding in each molecule. (3)
- June 2024, AS Unit 1, Q9 (1 mark): To compare polar and non‑polar liquids, a stream of liquid from a burette and a positively charged plastic rod can be used. Which row of the table shows the cor
- January 2024, AS Unit 1, Q5 (1 mark): Which molecule is polar? A CO2(g) B CCl4(g) C BeCl2(g) D NH3(g)
- January 2024, AS Unit 2, Q3 (1 mark): A compound contains • molecules with non-polar bonds • permanent dipole-permanent dipole forces between its molecules. What could be the formula of this compoun
- October 2023, AS Unit 1, Q20(b)(ii) (3 marks): A student stated that ‘Compound Y has polar bonds so it is a polar molecule’. Comment on this statement. (3)
- January 2023, AS Unit 1, Q14 (1 mark): Which molecule is polar? A 1,1‑dibromopropane B E‑1,2‑dibromoethene C hexafluoroethane D tetrachloromethane Use this space for any rough working. Anything you w
- October 2022, AS Unit 1, Q8 (1 mark): A stream of liquid from a burette is deflected by a charged rod. burette charged rod + + + + + + + beaker Which substance, in its liquid state, will be deflecte
- June 2022, AS Unit 1, Q21(b)(ii) (2 marks): Explain the polarity of the carbon–oxygen bond. (2)
- June 2022, AS Unit 1, Q21(b)(iii) (1 mark): State whether or not the carbon dioxide molecule is polar. Justify your answer. (1)
- June 2022, AS Unit 2, Q16(a) (2 marks): Descending the group from fluorine to iodine, the electronegativity of the atoms decreases even though their nuclear charge increases. Explain the trend in elec
- January 2022, AS Unit 1, Q8 (1 mark): Which of these molecules is not polar? A CO2 B HCl C H2O D NH3
- January 2022, AS Unit 2, Q22(b)(i) (1 mark): State the meaning of the term electronegativity. (1)
- January 2022, AS Unit 2, Q22(b)(ii) (2 marks): Explain the trend in electronegativity down Group 7. (2)
- October 2021, AS Unit 1, Q9 (1 mark): Which row gives the correct polarities of the S F bond and the SF6 molecule? Polarity of S F bond Polarity of SF6 molecule A polar polar B polar non-polar C non
- June 2021, AS Unit 1, Q11 (1 mark): Which compound has bonds that are the most polar? A H2O B H2S C NH3 D PH3
- January 2021, AS Unit 1, Q12 (1 mark): Which of these molecules is the most polar? A HF B OF2 C BF3 D CF4 Use this space for any rough working. Anything you write in this space will gain no credit.
- January 2021, AS Unit 1, Q20(d)(i) (1 mark): Complete the diagram of bromine monochloride to show the dipole. (1) Br Cl
- October 2020, AS Unit 1, Q17 (1 mark): Which diagram best represents the electron density in a molecule of hydrogen chloride? A H Cl B H Cl C H Cl D H Cl
- January 2020, AS Unit 1, Q12 (1 mark): Which of these molecules is polar? A OF2 B BF3 C CF4 D PF5
- June 2019, AS Unit 1, Q2 (1 mark): Which of these molecules is the most polar? A H H B H F C H Cl D H Br
- June 2019, AS Unit 1, Q4 (1 mark): Which is correct for tetrafluoromethane (CF4)? F C F F F Bonds Molecule A polar polar B non-polar polar C polar non-polar D non-polar non-polar
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