3.2.2 Amount Of Substance

Question 1

Relative atomic mass

Answer 1

The average mass of an atom of an element on a scale where an atom of carbon 12 is exactly 12

Question 2

Relative molecular mass

Answer 2

Average mass of a molecule on a scale where an atom of carbon 12 is exactly 12

Question 3

Relative formula mass

Answer 3

The average mass of a formula unit on a scale where carbon 12 is exactly 12

Question 4

What is relative formula mass used for

Answer 4

Ionic compounds

Question 5

Avogadro

Answer 5

6.02 x 10^-23

Question 6

Mr mole lives under the?

Answer 6

Mass

Question 7

Concentration =

Answer 7

Mol / volume

Question 8

Ideal gas equation

Answer 8

pV = nRT

p = pressure Pa
V = volume m^3
n = moles
R = molar gas constant 8.31
T = temp K

Question 9

Celsius to kelvins

Answer 9

+ 273

Question 10

Empirical formula

Answer 10

Simplest whole number ratio of atoms of each element in a compound

Question 11

Molecular formula

Answer 11

The actual number of atoms in each element of a compound

Question 12

Percentage yield

Answer 12

Actual/theoretical x 100

Question 13

Atom economy

Answer 13

Mr useful product / mr total reactants

Remember to use big numbers

Question 14

Economic advantages of high atom economy

Answer 14

Making lots of waste is economically not viable

Byproducts also require separation, disposal, additional costs

Question 15

Environmental advantages of atom economy

Answer 15

Processing fewer raw materials
Less waste , which harms environment
More sustainable

Question 16

Purpose of a titration

Answer 16

To find the concentration of an acid or alkali

Need a standard solution

Question 17

Biurette

Answer 17

Volume not fixed

Question 18

Pipette

Answer 18

Fixed, known volume