Question

Please help???? i dont know this

Answer 1

Answer:

a and b

Explanation:

Answer 2

Answer:

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

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.

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

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.

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

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.

 

$CH_{3} COOH+ NaHCO_3$→$CO_2+H_2O+CH_3COONa$

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

$Cu+O_2+CO_2+H_2O$→$Cu_2(OH)_2CO_3$

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.