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chemistry > energy changes (p1) > Flashcards

energy changes (p1) Flashcards

1
Q

What is the conservation of energy law?

A

Energy cannot be created or destroyed, it can only be transferred

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2
Q

What is an exothermic reaction?

A

A reaction that transfers (gives) energy to the surroundings

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3
Q

What is an endothermic reaction?

A

A reaction that takes in energy from the surroundings

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4
Q

What happens to the temperature of the surroundings in an exothermic reaction?

A

The temperature increases

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5
Q

What happens to the temperature of the surroundings in an endothermic reaction?

A

The temperature decreases

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6
Q

What happens to the energy of the reactants in exothermic reactions?

A

The reactants lose energy to form the products

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7
Q

What happens to the energy of the reactants in endothermic reactions?

A

The reactants gain energy to form the products

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8
Q

What are examples of exothermic reactions?

A

combustion, many oxidation reactions and neutralisation

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9
Q

What type of reaction are combustion reactions?

A

exothermic

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10
Q

What type of reaction are neutralisation reactions?

A

exothermic

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11
Q

What type of reaction are most oxidation reactions?

A

exothermic

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12
Q

What type of reaction takes place in hand warmers?

A

exothermic

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13
Q

What type of reaction takes place in self heating cans

A

exothermic

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14
Q

What type of reaction are thermal decomposition reactions?

A

endothermic

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15
Q

What is a thermal decomposition reaction?

A

The breakdown of a substance when it is heated

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16
Q

What type of reaction occurs when citric acid reacts with sodium hydrogencarbonate?

A

endothermic

17
Q

What is the activation energy?

A

The minimum amount of energy required for a reaction to occur

18
Q

What distance is labelled the activation energy on reaction profiles?

A

The distance from the reactants to the top of the peak

19
Q

What type of reaction takes place in sports injury packs?

A

endothermic

20
Q

what type of reaction are photosynthesis reactions

A

endothermic

chemistry (15 decks)

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