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Veseljchak [2.6K]
3 years ago
13

Which statement about exothermic reactions are true?

Chemistry
1 answer:
Hatshy [7]3 years ago
7 0

Answer:

It is either the third or fourth statement.

Explanation:

This is because exothermic reactions give off heat.

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Calculate the decrease in temperarure when 2.00 L at 20.0 degrees celsius is compressed to 1.00 L.
Serga [27]
I suspect that the pressure of this change is constant therefore

The equation is used from the combined gas law. (When pressure is constant both P's will cancel out P/P = 1)
V/T = V/T
Initial   Change

Initially we have 2L at 20 degress what temperature will be at 1L.

2/20 = 1/T
0.1 = 1/T
0.1T = 1
T = 1/0.1
T = 10 degress celsius.

Hope this helps if you won't be able to understand what is the combined gas law just tell me :).
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Why can’t you perform single displacement reactions with group IA metals?
pishuonlain [190]
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Antoine Lavoisier burned metals in sealed jars. What is your prediction of his experimental results?
Aliun [14]

Answer:

The mass of the jar and contents remained the same after the metal was burned.

Explanation:

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