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GCSE Chemistry > P1: Energy Changes > Flashcards

P1: Energy Changes Flashcards

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1
Q

Give some examples of exothermic reactions.

A

Combustion reactions, many oxidation reactions and most neutralisation reactions.

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2
Q

What is the name of the reaction where energy is transferred to the surroundings?

A

Exothermic,

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3
Q

What is the name of the reaction where energy is taken in from the surroundings?

A

Endothermic.

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4
Q

In an exothermic reaction, what has more energy: reactants or products?

A

Reactants, because energy is RELEASED.

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5
Q

In an endothermic reaction, what has more energy: the reactants or the products?

A

The products, because energy is ABSORBED.

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6
Q

In an exothermic reaction, what is the overall energy change?

A

Negative.

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7
Q

In an endothermic reaction, what is the overall energy change?

A

Positive.

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8
Q

An in endothermic reaction, are bonds broken or formed?

A

Broken.

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9
Q

In an exothermic reaction, are bonds broken or formed?

A

Formed.

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10
Q

When you break bonds, is energy taken in or given out?

A

Taken in.

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11
Q

When you form bonds, is energy taken in or given out?

A

Given out.

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12
Q

How can a simple cell be made?

A

By connecting two different metals in contact with an electrolyte.

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13
Q

In a non-rechargeable cell, how long is a voltage produced?

A

Until one of the reactants is used up.

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14
Q

What two things guarantee that fuel cells will produce a voltage?

A

If they have:
-A constant supply of a suitable fuel
-Oxygen

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15
Q

What are the products of hydrogen-oxygen fuel cells?

A

Water vapour.

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16
Q

What are the pros of alkaline cells?

A

Cheaper to manufacture.

17
Q

What is the con of an alkaline cell?

A

May end up in landfill sites once fully discharged; recyclable though it is expensive

18
Q

What is a pro of a rechargeable cell?

A

Can be recharged many times before being recycled, reducing the use of resources

19
Q

What is a con of a rechargeable cell?

A

Costs more to manufacture

20
Q

What are the pros of a hydrogen fuel cell?

A

Easy to maintain as there are no moving parts; small size; water is the only chemical product

21
Q

What are the cons of hydrogen fuel cells?

A

Very expensive to manufacture; need a constant supply of hydrogen fuel, which is a flammable gas

22
Q

What type of reaction is Sodium Hydrogencarbonate with Nitric Acid?

A

Endothermic.

23
Q

Is thermal decomposition endothermic or exothermic?

A

Endothermic.

GCSE Chemistry (11 decks)

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