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3 years ago

Help please ! ASAP neeeeeed and answerrrrrr

Chemistry

2 answers:

ivann1987 [24]3 years ago

7 0

Answer:

A. Heater will only become warm when switch is closed.

Explanation:

Switches are used to control the flow of electrons (basically electricity). If you look at the other trials, you see that when switch is open, the bulb or fan does not run cuz no electricity can get to them. But when switch is closed, electricity gets to them. Thus, they will experience similar thing with the heater I assume cuz they have not said anything about battery voltage or anything preventing heater from heating.

Luden [163]3 years ago

6 0

Answer:

The answer is D

Explanation:

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3 years ago

How many moles are present in 2.45 x 1023 molecules of CH ?

Phantasy [73]

Answer:

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Explanation:

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3 years ago

Which do you think could work to reduce air pollution and global warming

natka813 [3]

Recycling!! And also planting more trees.

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3 years ago

NEED HELP with 7. 8. 9. 10. 11. 12. And 14 !!

aleksley [76]

Answer:

1. 0.00040 calories

2. 8.57 calories

3. 0.196 calories

4. 68 calories

5. 243 calories

6. 83680 joules

7. 1,054,368 joules

8. 2.45 calories

9. 556 (it says calories to calories so it wouldn't change)

10. 28367.52 joules

11. 59.6 calories

12. 449.6 joules

13. 0.00234 calories

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15. 22877693.6 joules

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Explanation:

6 0

3 years ago

Which of the following is true?

Tomtit [17]

Answer:

a. A reaction in which the entropy of the system increases can be spontaneous only if it is endothermic.

Explanation:

The change in free energy (ΔG) that is, the <u>energy available to do work</u>, of a system for a constant-temperature process is:

$ΔG = ΔH - TΔS$

When ΔG < 0 the reaction is spontaneous in the forward direction.

When ΔG > 0 the reaction is nonspontaneous. The reaction is

spontaneous in the opposite direction.

When ΔG = 0 the system is at equilibrium.

If <u>both ΔH and ΔS are positive</u>, then ΔG will be negative only when the TΔS term is greater in magnitude than ΔH. This condition is met when T is large.

3 0

3 years ago