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3 years ago

Is a instant cold pack Endothermic or Exothermic reaction? Explain.

Chemistry

1 answer:

marshall27 [118]3 years ago

3 0

Answer:

Yes an instant cold pack is a perfect example of an endothermic reaction.

Explanation:

They are endothermic because they absorb heat energy from their surroundings. This means that the surroundings of endothermic reactions are colder as a result of the reaction.For example melting ice is a type of this reaction

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Answer:

Explanation:

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3 years ago

Read 2 more answers

A mixture initially contains A, B, and C in the following concentrations: [A] = 0.350 M , [B] = 0.650 M , and [C] = 0.300 M . Th

uysha [10]

<u>Answer:</u> The value of equilibrium constant, $K_c$ for the given reaction is 12.85.

<u>Explanation:</u>

For the given chemical equation:

$A+2B\rightleftharpoons C$

At t = 0 0.350M 0.650M 0.300M

At $t=t_{eq}$ (0.350 - x) (0.650 - 2x) (0.300 + x)

We are given:

Equilibrium concentration of A = 0.220 M

Forming an equation for concentration of A at equilibrium:

$0.350-x=0.220\\x=0.130$

Thus, the concentration of B at equilibrium becomes = $0.650-(2\times 0.130)=0.390M$

Equilibrium concentration of C = 0.430 M

The expression of $K_c$ for the given chemical equation is:

$K_c=\frac{[C]}{[A][B]^2}$

Putting values in above equation:

$K_c=\frac{0.430}{0.220\times (0.390)^2}\\\\K_c=12.85$

Hence, the value of equilibrium constant, $K_c$ for the given reaction is 12.85.

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3 years ago

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4 years ago

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2 years ago

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