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Chemistry igcse > Chemical Energetics > Flashcards

Chemical Energetics Flashcards

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1
Q

What is exothermic?

A

Reaction/process that releases energy into surroundings

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2
Q

In an exothermic reaction will the reactant or product have more energy?

A

Reactant

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3
Q

Examples of exothermic reactions/ processes?

A

Combustion of fuels
Reaction of acids w. Metal
Neutralisation of acids w. Bases
Production of energy from electrochemical cells

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4
Q

What is endothermic?

A

Reaction/process which absorbs energy

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5
Q

In an endothermic reaction/process, will the reactant or product have more energy?

A

Product

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6
Q

Examples of endothermic reactions/processes

A

Thermal decomposition of carbohydrates
Electrolysis
First stages of photosynthesis

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7
Q

What do energy level diagrams show?

A

Energy change of reaction in reactants to products

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8
Q

On an energy level diagram what do the x and y axis show?

A 
X= reactants and products
Y= energy change of reaction
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9
Q

What type of energy is given out and absorbed in endo/exothermic reactions

A

Heat

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10
Q

Do exothermic reactions have positive or negative reactant values?

A

Negative

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11
Q

Do endothermic reactions have positive or negative reaction values?

A

Positive

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12
Q

On an endothermic energy level diagram which way is the arrow pointing?

A

Up

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13
Q

Is breaking bonds endo or exo?

A

Endothermic

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14
Q

Is making bonds making endo or exo

A

Exothermic

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15
Q

Define fuel

A

Any substance that releases energy when burned

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16
Q

Advantages of using hydrogen as a fuel

A

Doesn’t pollute

Releases more energy per kilo gram than other fuels

17
Q

Disadvantages of using hydrogen as a fuel

A

Expensive

Difficult to store

18
Q

What type of energy do nuclear power stations use?

A

Heat

19
Q

In an exothermic reaction will the reactant or product have more energy?

A

Reactant

20
Q

Examples of exothermic reactions/ processes?

A

Combustion of fuels
Reaction of acids w. Metal
Neutralisation of acids w. Bases
Production of energy from electrochemical cells

21
Q

What is endothermic?

A

Reaction/process which absorbs energy

22
Q

In an endothermic reaction/process, will the reactant or product have more energy?

A

Product

23
Q

Examples of endothermic reactions/processes

A

Thermal decomposition of carbohydrates
Electrolysis
First stages of photosynthesis

24
Q

What do energy level diagrams show?

A

Energy change of reaction in reactants to products

25
Q

On an energy level diagram what do the x and y axis show?

A 
X= reactants and products
Y= energy change of reaction
26
Q

What type of energy is given out and absorbed in endo/exothermic reactions

A

Heat

27
Q

Do exothermic reactions have positive or negative reactant values?

A

Negative

28
Q

Do endothermic reactions have positive or negative reaction values?

A

Positive

29
Q

On an endothermic energy level diagram which way is the arrow pointing?

A

Up

30
Q

Is breaking bonds endo or exo?

A

Endothermic

31
Q

Is making bonds making endo or exo

A

Exothermic

32
Q

Define fuel

A

Any substance that releases energy when burned

33
Q

Advantages of using hydrogen as a fuel

A

Doesn’t pollute

Releases more energy per kilo gram than other fuels

34
Q

Disadvantages of using hydrogen as a fuel

A

Expensive

Difficult to store

35
Q

What type of energy do nuclear power stations use?

A

Heat

Chemistry igcse (6 decks)

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