Brainscape's Knowledge GenomeTM

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


See full index

a level chemistry > enthalpy changes > Flashcards

enthalpy changes Flashcards

1
Q

exothermic reaction

A

heat energy is released to the surroundings (ΔH is negative)

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

endothermic reaction

A

heat energy is absorbed from the surroundings (ΔH is positive)

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

average bond enthalpy

A

average enthalpy change for the breaking of one mole of bonds in gaseous molecules

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

standard conditions

A

298K
101kPa
1.0moldm-3

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

enthalpy change of neutralisation

A

enthalpy change when one mole of water is formed by neutralisation

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

enthalpy change of formation

A

enthalpy change when one mole of a compound is formed from its elements

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

enthalpy change of combustion

A

enthalpy change when one mole of a compound undergoes complete combustion

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

hess’ law

A

the enthalpy change of a reaction depends only on the initial and final states and is independent of the route taken

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

homolytic fission

A

bond breaks evenly to form two radicals

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

heterolytic fission

A

bond breaks unevenly to form two ions

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

enthalpy change of reaction

A

ΔrH = ΔH(breaking bonds) - ΔH(forming bonds)

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

enthalpy changes when making/breaking bonds

A

mexo bendo
making bonds is endothermic
breaking bonds is exothermic

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

using ΔfH data

A

use fliPpeR
arrows upwards
products - reactants

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

using ΔcH

A

use cRaP
arrows downwards
reactants - products

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

calculating enthalpy change of reaction from experimental data

A

q = mcΔt
ΔH = q / n

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

a level chemistry (19 decks)

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