1. Classify the following changes as physical or chemical. Even if you are incorrect in your assessment, you should be able to defend your choice. (a) Grass grows. (b) An infant gains 10 pounds. (c) A...

1. Classify the following changes as physical or chemical. Even if you are incorrect in your assessment, you should be able to defend your choice. (a) Grass grows. (b) An infant gains 10 pounds. (c) A rock is crushed to powder. (d) A tire is inflated with air.

2. Oxygen atoms are used to make water molecules. Does this mean that oxygen,
 and water,
, have similar properties? Why do we drown when we breathe in water despite all the oxygen atoms present in water?