CHEMICAL REACTIONS QUIZ test your knowledge also ability.
Chemical reactions are processes in which substances, called reactants, change into new substances, called products. Understanding chemical reactions is key in chemistry because it explains how matter transforms, releases energy, and forms compounds. This quiz tests your knowledge of reaction types, properties, and effects.
1. A chemical reaction involves
A. Only physical change
B. Rearrangement of atoms to form new substances
C. Change of state only
D. Melting or freezing
2. The substances that start a chemical reaction are called
A. Products
B. Reactants
C. Catalysts
D. Solvents
3. The substances formed after a chemical reaction are called
A. Reactants
B. Products
C. Catalysts
D. Solvents
4. Which of the following is an example of a combination reaction?
A. 2H₂ + O₂ → 2H₂O
B. 2HgO → 2Hg + O₂
C. Zn + CuSO₄ → ZnSO₄ + Cu
D. HCl + NaOH → NaCl + H₂O
5. Decomposition reaction involves
A. Two substances combining to form one
B. One substance breaking into two or more simpler substances
C. Exchange of ions
D. Formation of gas only
Chemical Reactions Quiz
6. Which reaction type is represented by A + BC → AC + B?
A. Combination
B. Decomposition
C. Displacement
D. Double displacement
7. The reaction between acid and base to form salt and water is called
A. Redox reaction
B. Neutralization
C. Combustion
D. Decomposition
8. Combustion reactions typically produce
A. Salt only
B. Water and carbon dioxide
C. Hydrogen gas
D. Metals
9. Which of the following is a redox reaction?
A. 2H₂ + O₂ → 2H₂O
B. HCl + NaOH → NaCl + H₂O
C. CaCO₃ → CaO + CO₂
D. NaCl + AgNO₃ → NaNO₃ + AgCl
10. Endothermic reactions
A. Release heat
B. Absorb heat
C. Produce gas only
D. Occur in cold only
Chemical Reactions Quiz
11. Exothermic reactions
A. Absorb heat
B. Release heat
C. Absorb electricity
D. Do not involve energy
12. A catalyst
A. Slows down reaction
B. Speeds up reaction without being consumed
C. Is always a reactant
D. Is always a product
13. Oxidation involves
A. Loss of electrons
B. Gain of electrons
C. Loss of protons
D. Gain of neutrons
14. Reduction involves
A. Loss of electrons
B. Gain of electrons
C. Loss of protons
D. Gain of neutrons
Chemical Reactions Quiz
15. Which reaction produces gas when vinegar reacts with baking soda?
A. Neutralization
B. Decomposition
C. Displacement
D. Double displacement
16. Precipitation reaction forms
A. Gas
B. Solid
C. Water
D. Heat
17. Which of these is a displacement reaction?
A. Zn + CuSO₄ → ZnSO₄ + Cu
B. 2H₂ + O₂ → 2H₂O
C. HCl + NaOH → NaCl + H₂O
D. 2HgO → 2Hg + O₂
18. In a double displacement reaction, two compounds
A. Exchange ions
B. Exchange electrons
C. Exchange protons
D. Exchange neutrons
19. Rusting of iron is an example of
A. Combustion
B. Oxidation
C. Neutralization
D. Precipitation
20. Photosynthesis is a chemical reaction that
A. Absorbs sunlight to produce glucose
B. Releases heat only
C. Produces salt
D. Is exothermic only
ANSWERS AND EXPLANATIONS on Chemical Reactions Quiz
1. B – Chemical reactions rearrange atoms, forming new substances with different properties.
2. B – Reactants are the starting substances in a chemical reaction.
3. B – Products are new substances formed after the reaction.
4. A – 2H₂ + O₂ → 2H₂O is a combination reaction forming one product.
5. B – Decomposition breaks one substance into simpler substances.
6. C – A + BC → AC + B is a displacement reaction, one element replaces another.
7. B – Acid + base → salt + water is called neutralization.
8. B – Combustion produces water and carbon dioxide when organic matter burns.
9. A – 2H₂ + O₂ → 2H₂O involves both oxidation and reduction.
10. B – Endothermic reactions absorb heat from surroundings.
11. B – Exothermic reactions release heat into surroundings.
12. B – Catalysts speed up reactions without being consumed.
13. A – Oxidation is the loss of electrons during a reaction.
14. B – Reduction is the gain of electrons during a reaction.
15. D – Vinegar + baking soda produces CO₂ gas, water, and sodium acetate.
16. B – Precipitation reactions form an insoluble solid called precipitate.
17. A – Zn displaces Cu from CuSO₄, showing a single displacement reaction.
18. A – Double displacement reactions involve the exchange of ions between compounds.
19. B – Rusting is slow oxidation of iron in the presence of water and air.
20. A – Photosynthesis absorbs sunlight to produce glucose and oxygen in plants.
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