c5.1

Question 1

Theoretical yield definition

Answer 1

maximum possible mass of a product that can be made in a chemical reaction

Question 2

Theoretical yield formula

Answer 2

mass of limiting reactant/ sum of Mr of limiting reactant x sum of Mr of products

Question 3

percentage yield

Answer 3

actual mass of product / maximum theoretical mass of product produced x 100

Question 4

factors effecting percentage yield

Answer 4

• reversible
• unwanted product
• lost in handling
• may be impure
• desired product may be lost

Question 5

atom economy definition

Answer 5

measure of how many atoms are in the reactants from a desired product

Question 6

atom economy formula

Answer 6

sum of Mr of desired product / sum of Mr of all products. x 100

Question 7

choosing a reaction pathway factors

Answer 7

• yield of product
• atom economy of reaction
• usefulness of by products
• rate of reaction
• equilibrium position
• cost of raw materials

Question 8

concentration definition

Answer 8

number of particles dissolved in a given volume

Question 9

concentration formula

Answer 9

amount of substance / volume of solution

Question 10

g/dm3 —> mol/dm3

Answer 10

divide by Mr

Question 11

titration

Answer 11

technique that uses a neutralisation reaction to find the concentration of an acid or alkali

Question 12

why can’t universal indicator be used for titrations

Answer 12

• mixture of indicators
• colours would be close to each other

Question 13

titre

Answer 13

amount of acid / alkali added by burette

Question 14

phenolphthalein

Answer 14

pink —> alkali
colourless —> acid

Question 15

Methyl Orange

Answer 15

Orange —> alkali
Red —> acid

Question 16

concordant results

Answer 16

within 0.1cm3 of each other

Question 17

cm3 —> dm3

Answer 17

divide by 1000

Question 18

volume of gases

Answer 18

the volume of one mole of any gas is 24 dm3 at room temperature and pressure

Question 19

volume formula of gases

Answer 19

moles x. 24dm3