Question

Which statements describe chemical changes? Check all that apply.

Answer 1

Explanation:

Chemical change is defined as those change in which arrangement of atoms present in the substance changes and leads to formation of new substance.

1.The after-rain smell is produced by an interaction between rain and the oils released by plants. Due to chemical reaction between the rain water and oils secreted out by the plants

2. A homemade volcano can be created by combining baking soda and vinegar. When it erupts, carbon dioxide gas is released. When vinegar reacts with baking soda  carbon-dioxide gas is released.

$CH_3COOH+NaHCO_3\rightarrow CO_2+H_2O+CH_3COONa$

3.The Statue of Liberty has turned green over time due to the reaction of copper with ,oxygen,carbon dioxide and water.

$Cu+O_2+CO_2+H_2O\rightarrow Cu_2(OH)_2CO_3$

Physical change is defined as those changes which leads to change in shape, size or state of the substance changes. No new substance is formed.

Answer 2

THe correct answers are A.The after-rain smell is produced by an interaction between rain and the oils released by plants. B. homemade volcano can be created by combining baking soda and vinegar. When it erupts, carbon dioxide gas is released. 
D.The Statue of Liberty has turned green over time due to the reaction of copper with carbon dioxide and water.