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scoray [572]
2 years ago
10

Specific gravity compares the density of a substance to the density of _____.

Chemistry
2 answers:
Eddi Din [679]2 years ago
6 0

Answer:

a given reference material

Explanation:

rewona [7]2 years ago
6 0

Answer:

Specific gravity compares the density of a substance to the density of <em><u>air</u></em><em><u>. </u></em>

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2 years ago
If nitrogen-13 has a half life of 2.5 years, how much remains from a 100g sample after 7.5 years
Sonbull [250]

Answer:

12.50g

Explanation:

T½ = 2.5years

No = 100g

N = ?

Time (T) = 7.5 years

To solve this question, we'll have to find the disintegration constant λ first

T½ = In2 / λ

T½ = 0.693 / λ

λ = 0.693 / 2.5

λ = 0.2772

In(N/No) = -λt

N = No* e^-λt

N = 100 * e^-(0.2772*7.5)

N = 100*e^-2.079

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N = 12.50g

The sample remaining after 7.5 years is 12.50g

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3 years ago
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According to Newton's 1st law of motion, what is required to make an object slow down?
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