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2 years ago

Which of the following happens during an endothermic chemical change?

Chemistry

1 answer:

Ede4ka [16]2 years ago

4 0

Answer:

products have a higher potential energy than the reactants

Explanation:

The total potential energy of the system increases for the endothermic reaction as the system absorbs energy from the surroundings. The total potential energy of the system decreases for the exothermic reaction as the system releases energy to the surroundings

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The combined gas law states that

seropon [69]

Answer:

Option B. PV = nRT.

Explanation:

From the above,

C = PV / T. (1)

But, C is directly proportional to n, where R is the gas constant i.e

C & n

C = nR

Substituting the value of C into equation (1), we have:

C = PV / T

nR = PV / T

Cross multiply to express in linear form

nRT = PV

Therefore,

PV = nRT

8 0

3 years ago

A piece of metal with a mass of 611 g is placed into a graduated cylinder that contains 25.1 ml of water, raising the water leve

jeka94

Mass of metal piece is 611 g and volume of graduated cylinder is 25.1 mL. When metal piece is placed in the graduated cylinder water level increases to 56.7 mL. The increase in volume is due to volume of metal piece that gets added to the volume of water.

Thus, volume of metal piece can be calculated by subtracting initial volume from the final one.

$V_{metal}=V_{final}-V_{initial}=(56.7-25.1)mL=31.6 mL$

Thus, volume of metal piece will be 31.6 mL. The mass of metal piece is given 611 g, density of metal can be calculated as follows:

$d=\frac{m}{V}=\frac{611 g}{31.6 mL}=19.33 g/mL$

Therefore, density of metal is 19.33 g/mL.

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3 years ago

Who among the following is most likely to have elevated levels of endorphins

andrew11 [14]

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3 years ago

WHAT IS THE CHEMICAL NAME FOR ALKYNE HAVING

madreJ [45]

Answer:

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Explanation:

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2 years ago

Calculate the volume of a 0.323-mol sample of a gas at 265 K and<br> 0.900 atm.

Katarina [22]

Answer:

V = 7.8 L

Explanation:

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5 0

3 years ago