Brainscape's Knowledge GenomeTM

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


See full index

adv chemistry > 1.5 reaction feasibility > Flashcards

1.5 reaction feasibility Flashcards

1
Q

what is the feasibility of a reaction?

A

whether it will spontaneously take place

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

what is a standard enthalpy of formation? (ΔH°f)

A

the enthalpy change when one mole of a substance is formed from its elements in their standard state

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

what is the standard state of a substance?

A

it’s most stable state at standard conditions

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

what is standard conditions?

A

pressure of 1 atmosphere and a specified temperature, usually room temp

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

what is room temp?

A

298K, 25 degrees

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

what is standard enthalpy of formation for an element?

A

zero

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

where can enthalpy of formation values be found?

A

page 11 of the data booklet

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

what is a spontaneous/feasible reaction?

A

one which happens if it’s own accord and doesn’t need energy input

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

what will a feasible reaction tend towards?

A

the products

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

what is entropy (S)?

A

a measure of the degree of disorder

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

the greater the entropy, the greater the…

A

disorder

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

what level of disorder do solids have?

A

low

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

what level of disorder do gases have?

A

high

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

what entropy value does a crystal lattice at absolute zero (0K) have?

A

zero

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

what do entropy values increase with?

A

temperature

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

when does a gradual increase in entropy change to a large increase on the temperature graph?

A

when a change in state occurs

17
Q

how does heat released by an exothermic reaction alter the entropy?

A

it increases it

18
Q

how does heat absorbed by an endothermic reaction system alter the entropy?

A

it decreases it

19
Q

what is the standard entropy? (ΔS)

A

the entropy of a substance at its standard state

20
Q

where are values of standard entropy found?

A

page 18 of the data booklet

21
Q

what does Gibbs free energy (ΔG) represent?

A

the excess energy available beyond what is needed to make the reaction spontaneous

22
Q

what does it mean if ΔG is less than 0?

A

reaction is feasible/spontaneous

23
Q

what does it mean if ΔG is 0?

A

reaction is just feasible/at equilibrium

24
Q

what does it mean if ΔG is greater than 0?

A

reaction is not feasible/spontaneous

25
Q

a reversible reaction proceeds spontaneously until…

A

a composition is reached where ΔG is 0

26
Q

when calculating ΔG, which value must be divided by 1000?

A

ΔS

adv chemistry (22 decks)

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