2022 paper 1 PPE

Question 1

Predict the difference, if any, between the volume of gas produced by calcium and strontium. (1)

Answer 1

• greater vol w/ Ca AND more moles of Ca

Question 2

Explain why the general increase in first ionisation energies across Period 3 is not followed for Mg to Al. (2)

Answer 2

• Mg electron removed from 3s orbital
  & Al electron is removed from 3p orbital
• Al electron has higher energy

Question 3

Name the apparatus the student should use to:

• make up the acid solution to 250cm^3

Answer 3

volumetric flask

Question 4

Name the apparatus the student should use to:

• measure the 25.0cm^3 portion:

Answer 4

(graduated) pipette

Question 5

Suggest what the student should do next to reduce the effect of any random error in the titration. (2)

Answer 5

• repeat until you get 2 titrations that are concordant
• calculate the mean titre from the concordant titres

Question 6

In which group of the periodic table is the element found in?

Group:

Justification:

Answer 6

Group: 2

Justification: largest increase b/w 2nd and 3rd ionisation energy values