Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

chemistry paper 1 > energy changes > Flashcards

energy changes Flashcards

1
Q

What happens during a chemical reaction

A

energy is conserved

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is an exothermic reaction

A

transfers energy to the surroundings and heats up the surroundings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

examples of an exothermic reaction

A

combustion
hand warmers
self heating cans

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

exothermic reaction profile

A

product molecules have less energy than the reactants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is an endothermic reaction

A

takes in energy from the surroundings, temperature of the surroundings cools down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

endothermic reaction profile

A

products have more energy than reactants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

examples of endothermic reaction

A

sports injury packs
photosynthesis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is activation energy

A

minimum amount of energy that particles must have to react

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

disadvantage of rechargeable cells and batteries

A

hard to dispose of
will eventually stop working

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

advantages of rechargeable cells and batteries

A

cab be recharged by reversing a reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

advantages of hydrogen fuel cell

A

fuel cells can be constantly provided if fuel keeps being put in

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

disadvantages of hydrogens fuel cell

A

harder to store
dangerous explosive gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what do cells contain

A

chemicals which react to produce electricity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

how can a simple cell be made

A

connecting 2 different metals with an electrolyte

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is a battery

A

two or more cells connected together in series to provide a greater voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what are non rechargeable cells and batteries

A

chemical reaction stops when one of the reactants has been used up

17
Q

what are non rechargeable batteries

A

alkaline batteries

18
Q

what are rechargeable batteries

A

can be recharged because the chemical reactions are reversed when an external electrical current is supplied

19
Q

what are fuel cells

A

supplied by an external source of fuel e.g hydrogen the fuel is then oxidised within the fuel cell to produce a potential difference

20
Q

what is the overall reaction in a hydrogen fuel cell

A

oxidation of hydrogen to produce water

21
Q
A

chemistry paper 1 (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions