2 years ago

21. For each of the following precipitation reactions,

Chemistry

1 answer:

Phantasy [73]2 years ago

6 0

I would say B.HS(aq)+NiSO4(aq)

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A scientist digs up sample of arctic ice that is 458,000 years old. He takes it to his lab and finds that it contains 1.675 gram

Fiesta28 [93]

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6.70 grams of krypton-81 was present when the ice first formed

Explanation:

Let use the below formula to find the amount of sample

$N= N_0(\frac{1}{2})^n$

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here

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$t_{\frac{1}{2}}$ = 229,000

$\frac{t}{t_{\frac{1}{2}}}$ = \ $\frac{ 458,000}{229,000}$

n = $\frac{t}{t_{\frac{1}{2}}}$ = 2.000

Now substituting the values

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$N_0= \frac{1.675}{0.2500}$

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What symbolizes the flow of energy in a diagram of a food chain?

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The first 5 are exothermic reaction because heat is in product means heat is evolved or given out.

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