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Chemistry > unit 5 - Exothermic and endothermic reactions > Flashcards

unit 5 - Exothermic and endothermic reactions Flashcards

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1
Q

What does an exothermic reaction do?

A

transfers thermal energy to the surroundings leading to an increase in the temperature of the surroundings

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2
Q

what does an endothermic reaction do?

A

takes in thermal energy from the surroundings, leading to a decrease in the temperature of the surroundings

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3
Q

is delta H negative for exothermic or endothermic reactions?

A

exothermic reactions

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4
Q

is delta H positive for exothermic or endothermic reactions?

A

endothermic reactions

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5
Q

what is enthalpy change (delta H)

A

transfer of thermal energy during a reaction

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6
Q

what is activation energy?

A

minimum energy that colliding particles must have to react

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7
Q

is bond breaking endothermic or exothermic process?

A

endothermic process

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8
Q

is bond making endothermic or exothermic process?

A

exothermic process

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9
Q

what goes in the x axis of the reaction profile?

A

progress of reaction

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10
Q

what goes in the y axis of the reaction profile?

A

energy

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11
Q

where does bond breaking occur?

A

between reactants and peak (endothermic)

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12
Q

where does bond making occur?

A

between peak and product (exothermic)

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13
Q

examples of endothermic reactions (or exothermic)

A

dissolving and precipitatione

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14
Q

examples of exothermic reactions

A

displacement/substitution and neutralisation

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15
Q

formula for overall energy change

A

product - reactants

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16
Q

what is the overall energy change between?

A

reactants and products

17
Q

what is the activation energy between?

A

reactants and peak

18
Q

where do reactants get their energy from?

A

around them (take thermal energy so surrounding feels cold = endothermic reaction) [to make products]

19
Q

what happens to the temperature in exothermic reactions?

A

increases

20
Q

what happens to the temperature in endothermic reactions?

A

decreases

Chemistry (8 decks)

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