Brainscape's Knowledge GenomeTM

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


See full index

Molecules and Analysis > Unit 10 > Flashcards

Unit 10 Flashcards

You may prefer our related Brainscape-certified flashcards:
Organic Chemistry 101 flashcards
1
Q

When bonds are made is energy input or output?

A

Output

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

When bonds are broken is energy input or output?

A

Input

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

What is an exothermic reaction?

A

When heat is given out. In the bonds in the products are stronger, they’re more energetically stable than the reactants

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

What is an endothermic reaction?

A

Energy is taken in. Bonds in the products are weaker and less energetically stable than the reactants

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

What is enthalpy change?

A

a heat change that takes place at constant pressure

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

What does standard enthalpy mean?

A

The heat change taking place at 1 ATM

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

What is a state function? and give examples

A

Depends on where you are not how you got there. Temp
Vol
Pressure

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

Is enthalpy a state function?

A

Yes it only depends on the beginning and the end

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

For an exothermic reaction what is enthalpy?

A

negative

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

For endothermic reaction what is enthalpy?

A

Positive

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

What is the transition state of a chemical reaction?

A

it is the intermediate configuration where potential energy is at its highest. It corresponds with activation energy

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

What is Hess’ law?

A

enthalpy of a chemical reaction is independent of the path. (reactions to get to final)

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

What is standard state?

A

It is how an element appears at 1 ATM and 25C

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

What is the enthalpy content of an element in its standard state?

A

0

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

What is standard heat of formation?

A

enthalpy change when one mole of substance is made from elements in their standard states

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

What is the standard heat of combustion?

A

enthalpy change when one mole of substance is completely burned with oxygen to form c02 and h20

17
Q

What is heat of atomisation?

A

Enthalpy change when one mole of substance in its standard state is changed to atoms in gaseous state

18
Q

What is solids turned directly into gases called?

A

Heats of sublimation

19
Q

Heat of combustion hess law cycle

A

Reactants —–> products
↓ ↓
CO2 + H2O
If you want to go the other way to what an arrow if facing, just change the sign

20
Q

heat of formation hess law cycle

A

Reactants ——> Products
↑ ↑
Elements standard state
If you want to go opposite of the arrow flip the sign

21
Q

What is the unit of enthalpy?

A

KJ Mol -1

22
Q

What will heat change be equal to?

A

Enthalpy change

Molecules and Analysis (14 decks)

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