F321 june 15 questions

Question 1

write the formula of cerium(III) sulfate and, explain what has happened to the cerium in this reaction in terms of the electrons transferred. (2)

Answer 1

Ce2(SO4)3 

(Cerium) loses three electrons

Question 2

explain what is meant by the term alkali. (1)

Answer 2

releases OH– ions into (aqueous) solution

Question 3

a student prepares a solution of calcium nitrate from calcium carbonate. what reagent would the student use? write the equation for the reaction (2)

Answer 3

HNO3 

CaCO3 + 2HNO3 -> Ca(NO3)2 + H2O + CO2