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Hoochie [10]
3 years ago
10

During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is like

ly occurring?
1)A solid forms, and there is a change of color.
2)A gas forms, and there is a change of color.
3)A solid forms, and light is emitted.
4)A gas forms, and light is emitted.
Chemistry
2 answers:
erma4kov [3.2K]3 years ago
7 0
Chemical reactions involve the breaking of bonds and forming new bonds. All chemical reactions involves forming of new substances. For this, stuation, it is evident that a chemical reaction occur because a precipitate formed. Therefore the correct answer is stated in statement 1.
Nimfa-mama [501]3 years ago
7 0
A solid forms, and there is a change of color.<span>
</span>
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T½ = 16hours

Explanation:

Final mass (N) = 10g

Initial mass (No) = 20g

Time (t) = 16hours

T½ = ?

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But λ = ?

In(N/No) = -λt

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In(0.5) = -16λ

-0.693 = -16λ

λ = 0.693 / 16

λ = 0.0433

Note : λ is known as the disintegration constant

T½ = In2 / λ

T½ = 0.693 / 0.0433

T½ = 16hours

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