Which of the following statements best describes why a chemical change is different from a physical change.
Group of answer choices
A) Chemical changes can only occur in a laboratory while physical changes can happen anywhere.
B) During a chemical change, you may see a change in color or temperature but physical changes will never change color or temperature.
C) Chemical changes involve formation of a new substance while physical change only impacts appearance or form.
D) Chemical changes impact appearance or form of a substance while physical changes affect the identity of the substance.
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Ответ:
C) Chemical changes involve formation of a new substance while physical change only impacts appearance or form.
Explanation:
The obvious difference between a chemical change and physical change is that in a chemical change new substances are produced while in a physical change, the form of the compounds are altered.
Most phase changes are products of physical changes. Such changes are easily reversible. In a chemical change, a new kind of matter is formed. It is accompanied by energy changes. The process is not easily reversible.Ответ:
2.77
Explanation:
pH = - log (1.70 x 10^-3) = 2.77