4.5 Energy Changes Flashcards

1
Q

What happens to the energy before and after a reaction

A

It is the exact same

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2
Q

What happens to the energy of the products when energy is transferred to the surroundings

A

Product molecules have much less energy than the reactions - by the amount that is transferred

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3
Q

Exothermic reaction

A

Energy transferred to the surroundings (surroundings temp. increased)

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4
Q

Endothermic reaction

A

Energy transferred from the surroundings to the products.

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5
Q

Examples of exothermic reactions:

A

Combustion, oxidisation, neutrilisation, self heating cans, hand warmers

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6
Q

Examples of endothermic reactions:

A

Thermal decomposition, citric acid and sodium hydrogencarbonate, cold packs

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7
Q

Minimum energy required for a reaction to occur

A

Activation energy

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8
Q

Where is the reactants on an energy level diagram of an exothermic reaction

A

Above the products

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9
Q

Where is the reactants on an energy level diagram of an endothermic reaction

A

Below the products

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10
Q

Reactants above products in energy level diagram

A

Exothermic

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11
Q

Reactants below products in energy level diagram

A

Endothermic

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12
Q
A
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