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saul85 [17]
3 years ago
15

what is the efficiency of a machine if your work on the machine is 1,200 j and the machines output work is 300j

Chemistry
1 answer:
astraxan [27]3 years ago
5 0

Answer:

25%

Explanation:

Efficiency is (output work ÷ input work) × 100

so

Efficiency = (300 J ÷ 1200 J ) × 100 %

                 = 25%

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6.02 x 1023<br> Significant figures
Bond [772]

Answer:

It depends on the number of significant figures you are changing to

Explanation:

6.02×1023=6158.46

1 sig fig = 6000

2 sig fig = 6200

3 sig fig = 6160

4 sig fig = 6158

5 sig fig = 6158.5

6 sig fig = 6158.46

When solving significant figures you have to consider the number after each number like in the case of changing to two sig fig the number following one is five and when the number is up to or greater than five you add a value of one to the number before it. But in a case where the number is less than five you just leave it like that like in the case of changing to one sig fig

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When a pure substance melts does its particles get larger
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Soil is a heterogeneous mixture. Which of the following
Dafna11 [192]
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Which equation represents the first electron affinity of chlorine?
mars1129 [50]
Answer:
            Option-A [<span>Cl (g) + e</span>⁻ <span> →  Cl</span>⁻<span> (g)] is the correct answer.

Explanation:
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                   Such problems often come in questions related to Born-Haber Cycle topic. Let suppose Mg and Cl</span>₂ is reacted to form<span> MgCl</span>₂ crystal.

Then the Cl₂ gas is first atomized as follow,

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So, option A is correct choice.
7 0
3 years ago
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