1. What type of chemical reaction occurs when cooking an egg?
a) Physical change
b) Decomposition
c) Synthesis
d) Protein denaturation
Answer: d) Protein denaturation
2. What is the chemical reaction involved in rusting of iron?
a) Combustion
b) Oxidation
c) Reduction
d) Neutralization
Answer: b) Oxidation
3. When vinegar reacts with baking soda, what type of reaction is this?
a) Acid-base reaction
b) Synthesis
c) Decomposition
d) Single displacement
Answer: a) Acid-base reaction
4. What is produced when hydrogen peroxide decomposes?
a) Water and oxygen
b) Water and carbon dioxide
c) Oxygen and nitrogen
d) Hydrogen and oxygen
Answer: a) Water and oxygen
5. What type of reaction occurs when you light a match?
a) Combustion
b) Synthesis
c) Decomposition
d) Neutralization
Answer: a) Combustion
6. Which of the following is an example of a chemical change?
a) Melting ice
b) Dissolving sugar in water
c) Burning wood
d) Boiling water
Answer: c) Burning wood
7. In which process does milk sour over time?
a) Fermentation
b) Combustion
c) Neutralization
d) Crystallization
Answer: a) Fermentation
8. What happens when baking powder is mixed with a liquid in baking?
a) It forms a solid
b) It undergoes a redox reaction
c) It releases carbon dioxide gas
d) It causes a color change
Answer: c) It releases carbon dioxide gas
9. Which reaction is responsible for the bubbling observed when you combine lemon juice with baking soda?
a) Combustion
b) Acid-base reaction
c) Oxidation
d) Decomposition
Answer: b) Acid-base reaction
10. What is formed when hydrochloric acid reacts with sodium hydroxide?
a) Sodium chloride and water
b) Sodium chloride and carbon dioxide
c) Hydrochloric acid and sodium hydroxide
d) Sodium hydroxide and water
Answer: a) Sodium chloride and water
11. What type of reaction is photosynthesis?
a) Combustion
b) Decomposition
c) Synthesis
d) Redox
Answer: d) Redox
12. What is the end product when alcohol undergoes fermentation?
a) Acetic acid
b) Carbon dioxide and ethanol
c) Lactic acid
d) Methanol
Answer: b) Carbon dioxide and ethanol
13. What chemical change occurs when bread is toasted?
a) Oxidation
b) Hydrolysis
c) Neutralization
d) Polymerization
Answer: a) Oxidation
14. What occurs during the process of rusting?
a) Iron reacts with water and oxygen
b) Iron reacts with carbon dioxide
c) Iron reacts with hydrochloric acid
d) Iron reacts with sulfur dioxide
Answer: a) Iron reacts with water and oxygen
15. What is the main chemical reaction involved in the process of respiration?
a) Combustion
b) Photosynthesis
c) Oxidation
d) Neutralization
Answer: c) Oxidation