Question

Match each vocabulary word with its definition.

1. a reaction that absorbs energy
exothermic
2. a reaction that releases energy
enthalpy
precipitate
3. the heat added to or lost by a system at constant pressure
the solid formed as a result of a chemical reaction involving
solutions
endothermic
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Answer 1

1. Endothermic.

2. Exothermic.

3. Enthalpy.

4. Precipitate.

Step-by-step explanation:

Hello,

In this case, for each statement we have:

1. A reaction that absorbs energy

In this case, the answer is endothermic, since the products result with more energy than the reactants, that is why it requires the absorption of heat to be successfully carried out.

2. A reaction that releases energy

In this case, the answer is exothermic, since the products result with less energy than the reactants, that is why it involves the release of heat once it is carried out.

3. The heat added to or lost by a system at constant pressure .

In this case, the answer is enthalpy, since it is thermodynamic state function which is related to the total heat content of the system. It is equal to the internal energy of the system plus the product of pressure and volume, nevertheless, at constant pressure, it is directly equal to the product of the pressure and the change in volume.

4. the solid formed as a result of a chemical reaction involving solutions.

In this case, the answer is precipitate which a solid that is formed when one of the products in the chemical reaction is water insoluble.

Best regards.

Answer 2

Step-by-step explanation:

1) A reaction that absorbs energy is called endothermic.

Endothermic reactions:

The type of reactions in which energy is absorbed are called endothermic reactions.

In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.

For example:

C + H₂O + 131 kj/mol → CO + H₂

2) A reaction that releases energy is called exothermic.

Exothermic reaction:

The type of reactions in which energy is released are called exothermic reactions.

In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.

For example:

Chemical equation:

C + O₂ → CO₂ + 393 Kj/mol

3) The heat added to or lost by a system at constant pressure is enthalpy of system.

Enthalpy is thermodynamic property. It is represented by " H". Its units are joule and calories.

Instead of enthalpy change in enthalpy is measured.

Formula:

ΔH = E + PV

ΔH = change in enthalpy

E = energy

P = pressure

V = Volume

It give us the information about reaction whether it is exothermic or endothermic.

4) The solid formed as a result of a chemical reaction involving

solutions is called precipitate.

The formation of solid particles during reaction is called precipitation. For example, when we mix silver nitrate and sodium chloride in water silver chloride precipitate out as solid particles.