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Natali [406]
3 years ago
11

HELP PLEASE!!!!

Chemistry
1 answer:
Olegator [25]3 years ago
6 0

Answer:

#4. 32.06

#5. 10.90

Explanation:

I don't if 5 is completely correct, but number 4 should be correct.

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PLEASE HELP!!
lana66690 [7]

Answer:

c

Explanation:

3 0
3 years ago
Read 2 more answers
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

N = 100 * 0.125

N = 12.50g

The sample remaining after 7.5 years is 12.50g

5 0
3 years ago
Name a chemical that is safe to use in food in small amounts.
Mrrafil [7]

Answer:

Phthalates.

Perfluoroalkyl chemicals (PFCs)

Perchlorate

Artificial food colors

Nitrates and nitrites

Explanation:

I hope this help

4 0
2 years ago
Which of the following is true about the composition of ionic compounds?
Andrej [43]
A. Anions and cations
4 0
3 years ago
Read 2 more answers
What characteristics identify a substance?
Nataliya [291]

Answer:

All substances can be characterized by their unique sets of physical and chemical properties.

4 0
3 years ago
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