Topic 5 Flashcards Preview

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Flashcards in Topic 5 Deck (11):
1

What is an exothermic reaction?

An exothermic reaction is one which transfers energy to the surroundings. Shown by a rise in temperature.

2

What is an example of an exothermic reaction?

Combustion

3

What is an endothermic reaction?

An endothermic reaction is one which takes in energy from the surroundings. Shown with a decrease in temperature.

4

What is an example of an endothermic reaction?

Thermal decommission(Cold Pack)

5

Is bond breaking endothermic or exothermic?

Endothermic

6

Is bond forming endothermic or exothermic?

Exothermic

7

What effects voltage in electrolysis?

Type of electrodes
Difference in reactivity
Electrolyte

8

Why do non-rechargeable batteries stop producing electricity?

As all of the reaction has taken place, and that the reaction can’t be reversed.

9

How does a fuel cell create energy?

They are supplied with fuel and oxygen that are reacted to create energy.

10

What are the advantages of a hydrogen fuel cell?

Don’t produce many pollutants
Can be recharged

11

What are the disadvantages of a hydrogen fuel cell?

Hard to source hydrogen
Batteries are hard to dispose of
Store less energy that fuel cells