Brainscape's Knowledge GenomeTM

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


See full index

AS-Level Chemistry Unit 1 > 1.3 Chemical Calculations > Flashcards

1.3 Chemical Calculations Flashcards

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

How do you work out the number of moles using mass?

A

number of moles = mass/mr

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

How do you work out the number of moles using concentration?

A

number of moles = concentration x volume

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

In what units should volume always be in?

A

dm^3

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

What is the unit for concentration?

A

mol dm^-3

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

What is mr?

A

relative atomic mass

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

How do you work out the empirical formula?

A

mass of the substances
divided by it’s mr
divide again by the lowest
work out the ratio

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

What is the ideal gas equation

A

PV= nRT

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

What does P stand for in the ideal gas equation? units?

A

pressure (Pascals/Pa)

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

What does V stand for in the ideal gas equation? units?

A

Volume (m^3)

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

What does n stand for in the ideal gas equation? units?

A

moles (mol)

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

What does R stand for in the ideal gas equation?

A

molar/ideal gas constant
always 8.31

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

What does T stand for in the ideal gas equation? units?

A

temperature (Kelvin/K)

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

How do you convert from *C to Kelvin (temperature)?

A

+273

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

How do you convert cm^3 to dm^3?

A

divide 1000

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

How do you convert dm^3 to m^3?

A

divide 1000

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

How do you convert m^3 to dm^3?

A

divide 1000

17
Q

How do you convert dm^3 to cm^3?

A

x 1000

18
Q

How do you convert cm^3 to m^3?

A

divide 1000000

19
Q

How do you convert m^3 to cm^3?

A

x 1000000

20
Q

How do you work out the atom economy?

A

(mass of useful product / total mass of reactants) x 100

21
Q

What is the unit of atom economy?

A

%

22
Q

How do you work out the molecular formula?

A

Divide the molar mass by empirical formula molar mass
then multiply that number by the empirical formula

23
Q

how do you calculate a back titration?

A
  1. Calculate the moles of acid added
  2. Calculate the moles of alkali added
  3. Subtract the moles of alkali from the moles of acid to give the number of acid reacted
  4. Calculate the moles of base that reacted
  5. Calculate the mass of base reacted
  6. Calculate % mass (mass reacted/mass of tablet x 100)
24
Q

How do you work out percentage yield?

A

mass of required product/theoretical x 100

25
Q

second pv=nrt equation

A

V2 = P1 V1 T2 / P2 T1

AS-Level Chemistry Unit 1 (8 decks)

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