Chemical Reactions Quiz

10 multiple choice questions

1. What is the law of conservation of mass?

A) Mass can be created in reactions B) Mass cannot be created or destroyed C) Mass always increases D) Mass always decreases

2. What is a synthesis reaction?

A) Two or more reactants combine to form one product B) One reactant breaks into two or more products C) Reactants swap elements D) A and B

3. What is a decomposition reaction?

A) Two reactants combine B) One reactant breaks into multiple products C) Elements swap places D) Reactants burn

4. What is the general formula for a combustion reaction?

A) A + B -> AB B) CH4 + O2 -> CO2 + H2O C) AB + CD -> AD + CB D) A -> B + C

5. What does a catalyst do in a chemical reaction?

A) Makes products B) Speeds up reaction without being consumed C) Changes the products D) Adds mass

6. What is an exothermic reaction?

A) Absorbs heat from surroundings B) Releases heat to surroundings C) No heat change D) Requires sunlight

7. What is activation energy?

A) Energy released B) Energy needed to start a reaction C) Energy of products D) Energy of catalysts

8. What is the pH of a strong acid?

A) 7 B) 1-3 C) 8-10 D) 14

9. In a single replacement reaction, what replaces what?

A) Oxygen replaces hydrogen B) A more reactive element replaces a less reactive one C) Elements always stay in place D) A compound breaks apart

10. What type of reaction is: 2H2 + O2 -> 2H2O?

A) Decomposition B) Synthesis C) Single replacement D) Double replacement

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