1. A chemical reaction is a process in which:
2. Which of the following indicates that a chemical reaction has occurred?
3. When iron reacts with oxygen to form rust, the reaction is called:
4. A reaction in which a single substance breaks down into simpler substances is called:
5. When zinc reacts with hydrochloric acid, hydrogen gas is produced. This is an example of:
6. The reaction between an acid and a base to form salt and water is called:
7. In oxidation reactions:
8. In reduction reactions:
9. Oxidation and reduction reactions occur together and are called:
10. Rusting of iron is an example of:
11. Burning of magnesium ribbon in air produces:
12. A reaction in which two substances combine to form a single product is called:
13. A reaction in which one element replaces another in a compound is called:
14. The substances that take part in a chemical reaction are called:
15. The substances formed after a chemical reaction are called:
16. Which of the following is an example of a decomposition reaction?
18. The law of conservation of mass states that:
19. Which of the following is an example of a combustion reaction?
20. Chemical reactions involve:
