A quality-control technician checks two metal samples labelled zinc and iron.

For each comparison, the technician uses equal masses of powder with the same particle size. The volume and concentration of each solution and the starting temperature are kept the same.

Test	Zinc sample	Iron sample
Volume of hydrogen made in the first minute with dilute hydrochloric acid in $cm3\mathrm{cm^3}$	34	11
Temperature rise with copper(II) sulfate solution in $∘C^{\circ}\mathrm{C}$	9.8	4.1

The technician also adds the iron sample to zinc sulfate solution. A metal coating forms on the iron sample.

Which result is anomalous? Explain your answer using all the results.

A quality-control technician checks two metal samples labelled zinc and iron.

For each comparison, the technician uses equal masses of powder with the same particle size. The volume and concentration of each solution and the starting temperature are kept the same.

Test	Zinc sample	Iron sample
Volume of hydrogen made in the first minute with dilute hydrochloric acid in $cm3\mathrm{cm^3}$	34	11
Temperature rise with copper(II) sulfate solution in $∘C^{\circ}\mathrm{C}$	9.8	4.1

The technician also adds the iron sample to zinc sulfate solution. A metal coating forms on the iron sample.

Which result is anomalous? Explain your answer using all the results.

4.1 Predicting chemical reactions

Question 32

Markscheme

4.1 Predicting chemical reactions

Question 32

Markscheme

4.1 Predicting chemical reactions

Question 32

4.1 Predicting chemical reactions Questions

4.1 Predicting chemical reactions

Question 32

4.1 Predicting chemical reactions Questions