How do chemical reactions, such as burning, differ from physical changes, such as melting and other phase changes?

Chemistry

1 answer:

IrinaVladis [17]2 years ago

5 0

Answer:

How to differentiate between physical and chemical change?

Physical and Chemical Changes to Matter

Physical changes only change the appearance of a substance, not its chemical composition.

Chemical changes cause a substance to change into an entire substance with a new chemical formula.

Chemical changes are also known as chemical reactions.

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The state of California experiences periodic occurrences of severe drought conditions. Which weather phenomenon most likely caus

e-lub [12.9K]

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3 years ago

How many half-lives are required for the concentration of reactant to decrease to 1.56% of its original value?4247.56.56

neonofarm [45]

Answer:

6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.

Explanation:

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$