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lisabon 2012 [21]
2 years ago
9

The steam engine in a train heats water until it becomes steam. The steam pushes pistons to move the train. The train is changin

g _____ energy into _______ energy
A)

kinetic, mechanical


B)

mechanical, heat


C)

electric, mechanical


D)

mechanical, potential

Pleas leave an explanation
Chemistry
1 answer:
Strike441 [17]2 years ago
8 0
The answer to your question is option A.
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How many molecules of nitrogen gas are found in 0. 045 L of nitrogen gas at STP?
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Answer:

See below

Explanation:

.045 liter / 22.4  l / mole   * 6.022 x 10^23 molecules/mole   * 2 atoms/molecule  =

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Given the two reactions PbCl2(aq)⇌Pb2+(aq)+2Cl−(aq), K3 = 1.89×10−10, and AgCl(aq)⇌Ag+(aq)+Cl−(aq), K4 = 1.25×10−4, what is the
Sergio [31]

Answer:

1.2\times 10^{-2}

Explanation:

The given reactions are:

PbCl2(aq)⇌Pb2+(aq)+2Cl−(aq)     K_3 = 1.89\times 10^{-10}

AgCl(aq)⇌Ag+(aq)+Cl−(aq)           K_4 = 1.25\times 10^{-4}

Required reaction is:

PbCl2(aq)+2Ag+(aq)⇌2AgCl(aq)+Pb2+(aq)

K_f = \frac{K_3}{K_4^2}\\=\frac{1.89\times 10^{-10}}{1.25\times 10^{-4}}^2\\=1.2\times 10^{-2}

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\boxed {\boxed {Answer}}

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