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Chemistry > CC15 > Flashcards

CC15 Flashcards

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1
Q

What is an exothermic reaction?

A

Energy is transferred from stores of energy in chemical bonds to the surroundings (it gives out energy). The temperature also increases.

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2
Q

What is an endothermic reaction?

A

Energy is transferred from the surroundings to stores of energy in chemical bonds. The temperature also decreases.

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3
Q

How does a simple reaction profile look like for an exothermic reaction?

A
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4
Q

How does a simple reaction profile look like for an endothermic reaction?

A
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5
Q

How does temperature change in an exothermic reaction?

A

The temperature increases in an exothermic reaction as the stored thermal (heat) energy in the solution increases during an exothermic reaction.

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6
Q

How does temperature change in an endothermic reaction?

A

The temperature decreases in an endothermic reaction as the stored thermal (heat) energy in the solution decreases during an endothermic reaction.

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7
Q

Is neutralisation an exothermic or endothermic reaction?

A

Neutralisation is an exothermic reaction.

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8
Q

Is displacement an exothermic or endothermic reaction?

A

Displacement is an exothermic reaction.

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9
Q

Does precipitation have a high or low activation energy?

A

Precipitation has a low activation energy.

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10
Q

Does neutralisation have a high or low activation energy?

A

Neutralisation has a low activation energy.

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11
Q

Does combustion have a high or low activation energy?

A

Combustion reactions have high activation energies.

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12
Q

How does a reaction profile including activation energy look like for an exothermic reaction?

A
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13
Q

How does a reaction profile including activation energy look like for an endothermic reaction?

A
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14
Q

Is breaking bonds an exothermic or endothermic process?

A

Energy is transferred to the reactants to break their bonds, so breaking bonds is endothermic.

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15
Q

Is making bonds an exothermic or endothermic process?

A

Energy is transferred to the surroundings as bonds form, so making bonds is exothermic.

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16
Q

What is bond energy?

A

It is the energy needed to break one mole of a particular covalent bond. It is measured in kJ mol⁻¹.

17
Q

How can you calculate energy change of a reaction?

A

Step 1: Calculate energy in (bonds broken)
Step 2: Calculate energy out (bonds made)
Step 3: Energy change = energy in - energy out
A negative number shows that the reaction is exothermic, endothermic reactions have a positive sign

Chemistry (17 decks)

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