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3 years ago

PLEASE HELP ME

Chemistry

1 answer:

Flauer [41]3 years ago

7 0

Answer:

Explanation:

Li(s)+1/2 F₂(g)→LiF(s)

In this reaction one mole of product is formed from gaseous state of reactants . So this reaction will represent the reaction for which ΔH∘rxn equals to ΔH∘f .

In other reaction one mole is not produced if we balance the reaction. The reactant must be in gaseous state . ΔH∘f . represents heat of formation . ΔH∘rxn represents heat of reaction .

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Give three examples of energy being changed to other forms.

dimaraw [331]

Solar: rays from the sun shine on solar pannels creating energy which is a renewable energy.
Water: water stored at a dam flows through turbines creating energy which is a renewable energy
Fossil fuels: fossil fuels are extracted from the ground the burned to create energy and this is a nonrenewable resource.
Hope this helps :)

6 0

3 years ago

The formation of a gas or a precipitate may be evidence for a ___________.

ololo11 [35]

Reaction [taking place]

Hope that helps

5 0

3 years ago

Suppose a system returns to its original overall, internal energy ((∆U) after the following changes. In step 1, 25 J of work is

Brums [2.3K]

Answer:

Heat transfer in step 2 = 47.75 J

Explanation:

Internal energy = heat + work done

U = Q + W

In a cyclic process the total internal energy change of the system = 0.

In the process there are two steps. The total heat exchange in the process is the sum of heat exchanges in the two processes.

We have to find the heat exchange in step 2.

In step 1,

W = 1.25 J Q = -37 J

$U_{1}$ = -37 + 1.25 = -35.75 J

In step 2, the internal energy change will be negative of that in step 1.

U = 35.75 J

W = -12 J

U = Q + W

35.75 = Q -12

Q = 47.75 J

Heat transfer in step 2 = 47.75 J

6 0

3 years ago

No I don’t have a question

Nikitich [7]

Answer:

then why'd you ask a question

Explanation:

3 0

2 years ago

Blababa [14]

Mtge answer is a malaria

5 0

3 years ago

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