Answer: D. Energy is absorbed, and kinetic energy increases.
Explanation:
An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surrounding.
An Exothermic reaction is a type of of chemical reaction in which energy is released into the surrounding.
When a liquid boils , it converts to gaseous state by absorbing energy from surroundings.
Kinetic energy is the energy possessed by an object by virtue of motion of particles.
Thus when liquid molecules absorb energy, the molecules gain kinetic energy and start moving faster in gaseous state.
The volume of 0.125 mole of the gas at the same temperature and pressure 0.30 L
<h3>Data obtained from the question </h3>
- Initial mole (n₁) = 0.82 mole
- Initial volume (V₁) = 2 L
- New mole (n₂) = 0.125 mole
- Pressure = Constant
- Temperature = Constant
- New Volume (V₂) =?
<h3>How to determine the new volume</h3>
The new volume can be obtained as illustrated below
PV = nRT
Divide both side by P
V = nRT / P
Divide both side by n
V / n = RT / P = Constant
Thus,
V₁ / n₁ = V₂ / n₂
2 / 0.82 = V₂ / 0.125
Cross multiply
0.82 × V₂ = 2 × 0.125
Divide both side by 0.82
V₂ = (2 × 0.125) / 0.82
V₂ = 0.30 L
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Answer:
We are heating the sample repeatedly to become a pure compound of only MgSO4 (withot H2O) and a constant mass.
Explanation:
Step 1: Data given
Mass of MgSO4·7H2O = 5.06 grams
The remaining MgSO4 had a constant mass of 2.47 grams.
Step 2: Explain why the sample in the crucible was heated repeatedly until the sample had a constant mass.
Before heating the compound has magnesium sulfate and water.
The total mass of this compound is 5.06 grams
By heating we try to eliminate the water.
After heating there remain mgSO4 with a mass of 2.47 grams
This means 5.06 - 2.47 = 2.59 grams is water. All of this is eliminated.
The heating process happens repeatedly to make sure the final compound is pure. So the 2.47 grams os only MgSO4. If the mass would not be constant. It means the compound is not pure, the not all the water is eliminated yet.
So we are heating the sample repeatedly to become a pure compound of only MgSO4 (withot H2O) and a constant mass.
Answer:
This means that as pressure increases,the volume decreases or the volume increases as the temperature increases, and decreases as the temperature decreases