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Chemistry > C7: Energy Changes > Flashcards

C7: Energy Changes Flashcards

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1
Q

What are the two types of chemical reaction

A

Exothermic
Endothermic

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2
Q

What is an exothermic reaction

A

A reaction that releases energy

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3
Q

What is the effect of an exothermic reaction

A

Temperature increased
Energy from reacting chemicals is transferred to the surroundings
Heat things up

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4
Q

What are examples of exothermic reactions

A

Combustion
Neutralisation
Oxidation
Hand warmers

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5
Q

What is an endothermic reaction

A

A reaction that absorbs energy

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6
Q

What is the effect of an endothermic reaction

A

Temperature of surroundings is decreased
Energy from surroundings is transferred to the reacting chemicals
Cooling things down

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7
Q

What are examples of endothermic reactions

A

Any decomposition type
The reaction between citric acid and baking soda (sodium bicarbonate)
Sports injury packs

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8
Q

What type of reaction is a self heating can

A

Exothermic

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9
Q

What are the two variables required for a reaction to take place

A

Collisions
Activation energy

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10
Q

What are collisions

A

Movement of particles in a reaction

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11
Q

What is activation energy

A

Amount of energy given to the reactants to start the reaction

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12
Q

What is a reaction profile

A

Reaction profiles show the progress of reaction on the x axis and the energy level on the y axis. Reaction profiles will tell us

Activation energy of a reaction
Overall energy change happening as a result of the reaction
Amount of energy contained within the products and the reactants

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13
Q

What is a catalyst

A

An enzyme that speeds up the reaction without being used up itself.

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14
Q

What would we have to do if we add a catalyst

A

Decrease the activation energy to increase the rate of reaction

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15
Q

What is a bond energy

A

Energy that measures the strength of chemical bonds.

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16
Q

How do we use bond energies to find out if the reaction is exothermic or endothermic

A

Total bond energies of products - Total bond energies or reactants

17
Q

What does making bonds require

A

Releasing energy
Bond making = exothermic reaction

18
Q

How do we know if it is an exothermic reaction

A

Amount of bonds made is more than the amount of bonds broken

The overall energy change is a negative value, meaning it is less than 0

19
Q

What does bond breaking require

A

Energy.
Bond breaking = exothermic reaction

20
Q

How do we know if it is an endothermic reaction

A

Amount of bonds made is less than the amount of bonds broken

The overall energy change is a positive value, meaning it is more than 0

21
Q
A

Chemistry (7 decks)

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