Brainscape's Knowledge GenomeTM

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


See full index

iGCSE Chemistry > 5.2 Energetics > Flashcards

5.2 Energetics Flashcards

1
Q

What is meant by the term enthalpy change?

A

heat energy released or absorbed per mole

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

What does endothermic mean?

A

heat energy absorbed

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

What does exothermic mean?

A

heat energy released

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

What does breaking bonds do?

A

absorbs energy

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

What type of reaction is bond breaking?

A

endothermic

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

What does making bonds do?

A

releases energy

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

What type of reaction is bond making?

A

exothermic

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

When is enthalpy change positive?

A

endothermic reactions

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

When is enthalpy change negative?

A

exothermic reactions

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

What requires more energy to break?

A

stronger bonds

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

What releases more energy when made?

A

stronger bonds

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

How can enthalpy change be calculated?

A

bonds broken - bonds made

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

How is a reaction profile diagram different to an energy level diagram?

A

shows path of reaction from reactants to products

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

When is more energy released?

A

exothermic reaction

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

When is less energy released?

A

endothermic reaction

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

When is more energy absorbed?

A

endothermic reaction

17
Q

When is less energy released?

A

exothermic reaction

18
Q

What is calorimetry?

A

experimental method used to measure enthalpy change`

19
Q

What happens in an exothermic calorimetry reaction?

A

reaction releases heat energy
absorbed by water
temperature of water increases

20
Q

What is the equation for heat energy Q (J)?

A

Q = mcΔT

21
Q

What is the equation for enthalpy change ΔH (kj/mol) ?

A

ΔH = - Q / moles

22
Q

What is heat energy measured in?

A

Joules

23
Q

What is enthalpy change measured in?

A

kilojoules / mole

24
Q

What is the simplest type of calorimetry?

A

combusting a fuel to heat up water

25
Q

What are the two significant errors in combusting a fuel?

A

heat loss
incomplete combustion

26
Q

How is heat loss an error in combusting a fuel?

A

heat energy dissipates into air instead of water

27
Q

How is incomplete combustion in combusting fuel an error?

A

releases less heat energy than expected

iGCSE Chemistry (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions