Which of the following are chemical processes?
1. rusting of a nail
2. freezing of water
3. decomposition of water into hydrogen and oxygen gases
4. compression of oxygen gas
A)2, 3, 4
B)1, 3, 4
C)1, 3
D)1, 2
E)1, 4

Question

Quizplus · Accepted Answer

1. Rusting of a nail involves a chemical reaction between iron and oxygen in the presence of water, so it is a chemical process.
2. Freezing of water is a physical process that involves a change of state from liquid to solid, so it is not a chemical process.
3. Decomposition of water into hydrogen and oxygen gases involves a chemical reaction, so it is a chemical process.
4. Compression of oxygen gas is a physical process that does not involve a chemical reaction, so it is not a chemical process.

Which of the Following Are Chemical Processes