OCR A-LEVEL CHEMISTRY
EXAM
1. What is an Acid?
A. A species that releases OH⁻ ions in solution
✅ B. A species that releases H⁺ ions in aqueous solution
C. A compound that accepts protons
D. A neutral molecule that forms salts
2. What does the Acid Dissociation Constant (Ka) represent?
A. The rate constant of an acid reaction
✅ B. The equilibrium constant that shows the extent of dissociation of a weak acid
C. The number of hydrogen ions in a solution
D. The concentration of base formed
3. What is an Acid-Base Pair?
A. Two acids that differ by one proton
B. Two bases that neutralise each other
✅ C. Two species that transform into each other by gain or loss of a proton
D. A compound containing both acid and base groups
4. What is Activation Energy?
A. The total energy of a system
B. The energy released during a reaction
✅ C. The minimum energy required to start a reaction by the breaking of bonds
D. The difference in energy between reactants and products
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,5. What is Actual Yield?
A. Theoretical amount of product
✅ B. The amount of product obtained from a reaction
C. The mass of reactants used
D. The efficiency of a reaction
6. What is Addition Polymerisation?
A. Breaking polymers into smaller units
✅ B. Formation of a long chain by repeated addition of unsaturated alkene molecules
C. Removal of water to form polymers
D. Condensation reaction forming polymers
7. What is an Addition Reaction?
A. A reaction forming two products
✅ B. A reactant added to an unsaturated molecule to form one saturated molecule
C. A redox reaction
D. A reaction that breaks double bonds
8. What is Adsorption?
✅ A. The process where a gas or liquid or solute is held to the surface of a solid
B. The process of soaking a liquid into a material
C. A chemical reaction on a surface
D. The conversion of solids to gases
9. What does “Alicyclic” mean?
✅ A. Carbon atoms joined together in a ring that is not aromatic
B. Carbon atoms joined in a straight chain
C. Aromatic cyclic compounds
D. Compounds with delocalised electrons
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, 10. What does “Aliphatic” refer to?
✅ A. Carbon atoms joined together in straight or branched chains
B. Compounds containing benzene rings
C. Compounds containing oxygen atoms
D. Cyclic hydrocarbons
11. What is an Alkali?
A. A base that does not dissolve in water
✅ B. A base that dissolves in water forming OH⁻(aq) ions
C. A neutral salt
D. A proton donor
12. What are Alkanes?
✅ A. Hydrocarbons with single carbon-to-carbon bonds and formula CₙH₂ₙ₊₂
B. Hydrocarbons with double bonds
C. Aromatic hydrocarbons
D. Hydrocarbons with triple bonds
13. What are Alkenes?
A. Hydrocarbons with single carbon-to-carbon bonds
✅ B. Hydrocarbons with at least one C=C double bond and formula CₙH₂ₙ
C. Hydrocarbons with triple bonds
D. Aromatic hydrocarbons
14. What is an Alkyl Group?
A. A carbonyl group
✅ B. A side chain formed by removing a hydrogen atom from an alkane
C. A functional group containing oxygen
D. A halogen atom
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EXAM
1. What is an Acid?
A. A species that releases OH⁻ ions in solution
✅ B. A species that releases H⁺ ions in aqueous solution
C. A compound that accepts protons
D. A neutral molecule that forms salts
2. What does the Acid Dissociation Constant (Ka) represent?
A. The rate constant of an acid reaction
✅ B. The equilibrium constant that shows the extent of dissociation of a weak acid
C. The number of hydrogen ions in a solution
D. The concentration of base formed
3. What is an Acid-Base Pair?
A. Two acids that differ by one proton
B. Two bases that neutralise each other
✅ C. Two species that transform into each other by gain or loss of a proton
D. A compound containing both acid and base groups
4. What is Activation Energy?
A. The total energy of a system
B. The energy released during a reaction
✅ C. The minimum energy required to start a reaction by the breaking of bonds
D. The difference in energy between reactants and products
1
,5. What is Actual Yield?
A. Theoretical amount of product
✅ B. The amount of product obtained from a reaction
C. The mass of reactants used
D. The efficiency of a reaction
6. What is Addition Polymerisation?
A. Breaking polymers into smaller units
✅ B. Formation of a long chain by repeated addition of unsaturated alkene molecules
C. Removal of water to form polymers
D. Condensation reaction forming polymers
7. What is an Addition Reaction?
A. A reaction forming two products
✅ B. A reactant added to an unsaturated molecule to form one saturated molecule
C. A redox reaction
D. A reaction that breaks double bonds
8. What is Adsorption?
✅ A. The process where a gas or liquid or solute is held to the surface of a solid
B. The process of soaking a liquid into a material
C. A chemical reaction on a surface
D. The conversion of solids to gases
9. What does “Alicyclic” mean?
✅ A. Carbon atoms joined together in a ring that is not aromatic
B. Carbon atoms joined in a straight chain
C. Aromatic cyclic compounds
D. Compounds with delocalised electrons
2
, 10. What does “Aliphatic” refer to?
✅ A. Carbon atoms joined together in straight or branched chains
B. Compounds containing benzene rings
C. Compounds containing oxygen atoms
D. Cyclic hydrocarbons
11. What is an Alkali?
A. A base that does not dissolve in water
✅ B. A base that dissolves in water forming OH⁻(aq) ions
C. A neutral salt
D. A proton donor
12. What are Alkanes?
✅ A. Hydrocarbons with single carbon-to-carbon bonds and formula CₙH₂ₙ₊₂
B. Hydrocarbons with double bonds
C. Aromatic hydrocarbons
D. Hydrocarbons with triple bonds
13. What are Alkenes?
A. Hydrocarbons with single carbon-to-carbon bonds
✅ B. Hydrocarbons with at least one C=C double bond and formula CₙH₂ₙ
C. Hydrocarbons with triple bonds
D. Aromatic hydrocarbons
14. What is an Alkyl Group?
A. A carbonyl group
✅ B. A side chain formed by removing a hydrogen atom from an alkane
C. A functional group containing oxygen
D. A halogen atom
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