Friction is a force that opposes motion. When friction is present, heat is generated.

Chemistry

2 answers:

anyanavicka [17]2 years ago

8 0

Answer:

I think it is: Some of the energy is converted into thermal energy.

Explanation:

Please let me know if I am wrong so I can fix it :)

netineya [11]2 years ago

4 0

I think the answer is A

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When HCl(g) reacts with NH3(g) to form NH4Cl(s), 42.1 kcal of energy are evolved for each mole of HCl(g) that reacts. Write a ba

stich3 [128]

<u>Answer:</u> The chemical equation is $HCl(g)+NH_3(g)\rightarrow NH_4Cl(s)+42.1kCal$

<u>Explanation:</u>

There are 2 types of reactions that are classified based on enthalpy change:

Endothermic reaction
Exothermic reaction

Endothermic reactions: They are defined as the reactions where heat is absorbed by the reaction. The change in enthalpy of the reaction is always positive.

Exothermic reactions: They are defined as the reactions where heat is released by the reaction. The change in enthalpy of the reaction is always negative.

Given values:

Energy released for 1 mole of HCl reacted = -42.1 kCal

The chemical equation for the formation of ammonium chloride follows:

$HCl(g)+NH_3(g)\rightarrow NH_4Cl(s)+42.1kCal$

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