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Chemistry > Energy Changes PAPER 1 > Flashcards

Energy Changes PAPER 1 Flashcards

1
Q

What is an electrolyte?

A

A liquid where ions can move freely

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2
Q

What is an electrode?

A

Metal that can conduct electricity

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3
Q

What metals are less reactive than carbon? (Displacement)

A

Iron
Zinc
Copper
Gold

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4
Q

Which metals are more reactive than carbon?

A

Magnesium
Calcium
Sodium
Potassium

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5
Q

The ______ the difference in reactivity of electrodes, the ______ the voltage produced

A

Bigger, greater

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6
Q

What is an alkaline battery?

A

A non rechargeable battery

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7
Q

Why are some batteries non rechargeable?

A

Because the reactants (electrodes and electrolyte) get used up

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8
Q

How do fuel cells produce electricity?

A

By using fuel and oxygen where the fuel is oxdised electrochemically.

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9
Q

What are hydrogen fuel cells?

A

Fuel cells which use hydrogen as a fuel

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10
Q

What are the disadvantages to hydrogen fuel cells? (2)

A

Expensive
Highly flammable

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11
Q

What is an advantage to using hydrogen fuel cells?

A

Dont produce pollutants instead water

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12
Q

What are the disadvantages and advantages to alkali cells?

A

Cheap
Not environmentally friendly (go to landfill)

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13
Q

What is an endothermic reaction?

A

When energy is taken in from surroundings

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14
Q

What is an exothermic reaction?

A

When energy is released to surroundings

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15
Q

What is a redox reaction?

A

When oxidation and reduction occur at the same time

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16
Q

What is reduction?

A

Gaining of electrons

17
Q

What is oxidation?

A

Losing of electrons

18
Q

What is thermal decomposition?

A

When a compound break down when heated

19
Q

What is activation energy?

A

The minimum amount of energy needed for particles to react

20
Q

Method: temperature changes?

A

1) measure 25cm³ of HCL into polystyrene cups using measuring cylinder
2) measure the initial temperature of HCL using thermometer
3) measure 5cm³ of NAOH and add to polystyrene cup
4) Quickly put lid on the cup & stir thermometer through hole
5) wait for thermometer to reach consistent reading as record as final temperature
6) repeat and calculate mean

Chemistry (12 decks)

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