Grade 8 Science Quiz: Chemical Reactions

Instructions:

Please answer the following questions about chemical reactions. For questions that provide multiple choice answers, select the correct option.

What is a chemical reaction?
- A) A process that involves changing the physical state of a substance
- B) A process where substances (reactants) convert into different substances (products)
- C) A process that changes only the appearance of a substance
- D) A process that only occurs in living organisms
Which of the following statements describes what happens to atoms during a chemical reaction?
- A) Atoms are created or destroyed.
- B) Atoms rearrange to form new substances.
- C) Atoms convert into energy.
- D) Atoms remain unchanged throughout the reaction.
What is the law of conservation of mass?
- A) Matter can be created from nothing in chemical reactions.
- B) The total mass of reactants equals the total mass of products in a chemical reaction.
- C) Mass can be lost during a chemical reaction.
- D) The mass of products in a reaction can vary.
Which of the following is NOT a type of chemical reaction?
- A) Synthesis
- B) Decomposition
- C) Combustion
- D) Evaporation
What typically indicates that a chemical reaction has occurred?
- A) Change in temperature, color, or production of gas
- B) Change in shape or size
- C) Change in volume only
- D) Change in the state of matter without a temperature change

B - A process where substances (reactants) convert into different substances (products)
B - Atoms rearrange to form new substances.
B - The total mass of reactants equals the total mass of products in a chemical reaction.
D - Evaporation
A - Change in temperature, color, or production of gas

What to create	Quiz
Which subject	Science
What age group	Year or Grade 8
What topic	Chemical reactions
Question types	Mixed
Number of questions	5
Number of answers	4
Correct answers	Exactly 1
Show correct answers
Use images (descriptions)
Any other preferences	Describe what happens to atoms in chemical reactions