Brainscape's Knowledge GenomeTM

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


See full index

General Chem I > Chapter 7 > Flashcards

Chapter 7 Flashcards

You may prefer our related Brainscape-certified flashcards:
AP® Chemistry flashcards Periodic Table flashcards Chemistry 101 flashcards Organic Chemistry 101 flashcards
1
Q

What is a system?

A

part of the universe where the study is focused

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

What is the immediate surrounding?

A

the surroundings that the system affects

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

What is energy?

A

capacity to do work or produce heat

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

What is the law of conservation of energy aka 1st law of thermodynamics?

A

states that energy can be converted from one form to another but never created nor destroyed

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

What are exothermic reactions?

A

system release energy

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

What are endothermic reactions?

A

system absorbs energy

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

What will the energy number be if the reaction is endothermic?

A

positive

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

What will the energy number be if the reaction is exothermic?

A

negative

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

What is enthalpy?

A

change in enthalpy (Delta H) of a system equals the flow of heat into or out of a system

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

What is the equation for change in enthalpy of a system?

A

delta H Reaction = delta HProducts –delta HReactants

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

What is a state function?

A

variable that only depends on the state

that the system is in, value does not depend on the path taken to reach that specific value.

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

How is enthalpy like a state function?

A

there will be 0 change in total heat going from reactant to product since the internal heat within a pathway can’t change (no matter how many paths you

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

What is the equation for the enthalpy of a system?

A

H = internal energy of a system + pressurexvolume

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

What does delta H also equal when PRESSURE IS CONSTANT?

A

delta H = q

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

What is calorimetry?

A

science of measuring heat

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

What is heat capacity?

A

amount of heat needed to raise the temperature of a substance by 1 degree NOT INCLUDING MASS

17
Q

What is specific heat capacity?

A

is the amount of energy required to

raise the temperature of 1 gram of substance by 1 ºC

18
Q

What are the units of specific heat capacity?

A

Units of J/ºC•gor J/K•g

19
Q

What is molar heat capacity?

A

The amount of energy required to raise

the temperature of 1 mol of substance by 1 ºC

20
Q

What are the units of the molar heat capacity?

A

Units of J/ºC•mol or J/K•mol

21
Q

What is the equation for heat transfer?

A

q = smΔT

22
Q

What is Hess’s law?

A

If a process can be written as the sum of several processes, the change in enthalpy (DH) of the process equals the sum of the enthalpy changes of the individual steps

23
Q

In Hess’s law, what happens to the sign of the enthalpy when you switch products and reactants?

A

you switch the signs

24
Q

The magnitude of ΔH is directly proportional to…

A

the amount of reactant and products in a reaction

25
Q

What is the standard enthalpy of formation?

A

the change in enthalpy that accompanies the formation of 1 mole of a compound from its elements

26
Q

What is the standard enthalpy of formation symbol?

A

ΔHfº

27
Q

What is the equation for the standard of enthalpy?

A

(all products) - (all reactants)

28
Q

In the standard of enthalpy of formation equations, what is the number of lone elements?

A

0

29
Q

`What is bond strength?

A

defined as the energy required to break the bond

30
Q

What influences the bond values for bond energies?

A

chemical “environments”

31
Q

What is the equation for the energy of reaction?

A

sum of bonds broken minus the sum of bonds formed

32
Q

What are examples of state functions?

A

potential energy, temperature, enthalpy

33
Q

q system = - q surroundings means what?

A

heat of system will be = to opposite signs of heat of its surroundings

34
Q

q metal = -qwater means what?

A

heat of metal will be equal to opposite signs of heat of water

General Chem I (10 decks)

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