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stich3 [128]
3 years ago
15

Jamal combined baking soda and vinegar but he is having trouble determining if what he observed is a chemical reaction or a phys

ical change. a.change in color
b. absorption of heat
c. no change on properties
d. formation of new substances
Physics
2 answers:
maria [59]3 years ago
4 0
D is the answer............
KonstantinChe [14]3 years ago
4 0
D.<span>formation of new substances i hope this helps you 

</span>
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Answer:

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2 years ago
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Answer:

proof in explanation

Explanation:

First, we will calculate the number of half-lives:

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n = \frac{2100\ million\ years}{700\ million\ years}\\\\n = 3

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n_u = \frac{1}{2^{n} }(total\ nuclei)\\\\n_u = \frac{1}{2^{3} }(6400\ million)\\\\n_u = \frac{1}{8}(6400\ million)\\\\n_u =  800\ million

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dividing both:

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