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chemistry c1/5/9 > c5 energy changes > Flashcards

c5 energy changes Flashcards

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1
Q

what is an exothermic reaction

A

a reaction that gives out heat energy to its surroundings

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2
Q

what is endothermic

A

a reaction that takes in heat energy from to its surroundings

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3
Q

what us the activation energy of a chemical reaction

A

the minimum amount of energy required to start a reaction

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4
Q

what are the following reactions are exothermic

A

oxidation and ions
neutralisation
combustion

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5
Q

what happens to the surroundings temperature in a endothermic reaction

A

decreases

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6
Q

what happens to the surroundings temperature in a exothermic reaction

A

increases

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7
Q

what are the following reactions for endothermic

A

thermal decomposition

citric acid and sodium hydrogen carbonate

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8
Q

how are the products and reactions shown in an endothermic reaction

A

products are at a higher energy than reactants
reactants=low
products=high

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9
Q

how are the products and reactions shown in an exothermic reaction

A

the products are at a lower energy than the reactants
product=low
reactants=high

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10
Q

what is a product

A

a new chemical that is made after the reaction took place

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11
Q

what is a reactant

A

the substance that is used in a reaction

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12
Q

what is one thing that energy must do

A

always be supplies to break bonds

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13
Q

what reaction is bond breaking

A

endothermic

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14
Q

what reactions is bond forming

A

exothermic

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15
Q

what is energy change

A

energy breaking bonds in reactants-energy released making bonds in products

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16
Q

what happens during a chemical reaction

A

old bonds are broken to form new bonds

17
Q

are reactants and products shown as high or low for endothermic reaction profiles

A

reactants are low

products are high

18
Q

are reactants and products shown as high or low for exothermic reaction profiles

A

reactants high

products low

19
Q

what are reaction profiles

A

Reaction profiles can be used to show the relative energies of reactants and products,activation energy and overall energy reaction

20
Q

how can u tell reactions are taking place

A

change in colour
change in temperature
change in odour
a new substance formed

21
Q

how can u tell if something is a exothermic reaction?

A

gets hotter

heat / energy is given off

22
Q

what’s rate of reaction

A

is the speed at which a chemical reaction takes place

chemistry c1/5/9 (5 decks)

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