equations

Question 1

atom economy

Answer 1

Mr desired product/total Mr products x 100

Question 2

percentage yield

Answer 2

actual yield/theoretical yield x 100

Question 3

moles

Answer 3

mass/Mr

Question 4

reacting masses (4 steps)

Answer 4

1. tick/?-what do we have/what do we want to work out
2. find moles of tick (known)
3. find moles of ? (unknown) using ratio
4. find mass of ? using Mr x moles

Question 5

using moles to balance equations (4 steps)

Answer 5

1. write out equation and check if balanced
2. calculate the moles of all reactants and products
3. divide all answers by smallest number and round to simplest whole number ratio
4. balance equation using ratio

Question 6

limiting reactant (3 steps)

Answer 6

1. write the balanced equation
2. calculate the number of moles of reactants if given masses
3. use mole ratio to work out limiting reactant

Question 7

concentration (mol/dm³)

Answer 7

moles/volume

Question 8

concentration (g/dm³)

Answer 8

mass/volume

Question 9

conc (mol/dm³) in conc (g/dm³)

Answer 9

conc (mol/dm³) x Mr

Question 10

cm³ to dm³

Answer 10

/1000

Question 11

calculating titrations (4 steps)

Answer 11

1. calculate number of moles for known concentration
2. use molar ratio from equation to work out moles of unknown
3. use moles of unknown to work out concentration
4. convert from mol/dm³ to g/dm³

Question 12

gas volume

Answer 12

no. moles x molar volume (24)