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drek231 [11]
3 years ago
13

A firecracker exploding would be an example of a (n) ___? A. Physical change B. Exothermic reaction C. Formation of a precipitat

e D. Endothermic reaction
Chemistry
2 answers:
irina [24]3 years ago
5 0
Exothermic because an explosion releases energy, and an exothermic reaction releases heat energy.
Jobisdone [24]3 years ago
3 0
The answer would be A) or the first option.
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3 years ago
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4 0
2 years ago
A vial containing radioactive selenium-75 has an activity of 3.0 mCi/mL. If 2.6 mCi are required for a leukemia test, how many m
oksian1 [2.3K]

Answer : The 866.66\mu L must be administered.

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As we are given that a vial containing radioactive selenium-75 has an activity of 3.0mCi/mL.

As, 3.0 mCi radioactive selenium-75 present in 1 ml

So, 2.6 mCi radioactive selenium-75 present in \frac{2.6mCi}{3.0mCi}\times 1ml=0.86666ml\times 1000=866.66\mu L

Conversion :

(1ml=1000\mu L)

Therefore, the 866.66\mu L must be administered.

4 0
2 years ago
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