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givi [52]
3 years ago
14

Please help???? i dont know this

Chemistry
2 answers:
xeze [42]3 years ago
7 0

Answer:

a and b

Explanation:

Nesterboy [21]3 years ago
4 0

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.

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