Chem paper 1 2019 mistakes

describe the process of electrospray ionisation

sample dissolved in solvent, injected through a needle at high voltage

state the meaning of periodicity

repeating patterns

observation for the exaction between sodium bromide and concentrated sulfuric acid

brown gas

role of acid in sodium bromide + concentrated acid

oxidising agent

Explain why copper iodide is white

doesn’t absorb any wavelengths of visible light and has a full d subshell

Suggest two ways that the student could reduce the percentage uncertainty in the

measurement of the volume of sodium thiosulfate solution, using the same

apparatus as this experiment.

Use more alloy

Use less concentrated sodium thiosulfate