# Quantitative chemistry – pupil resources

This collection of classroom resources features all the pupil activities from our Developing expertise in teaching quantitative chemistry course for teachers. This collection is most valuable to those who have attended this course and wish to put into practice with their students some of the ideas and activities presented as part of that event.

## The change in mass when magnesium burns

Magnesium is weighed and then heated in a crucible. It reacts with oxygen to produce the oxide. It can be shown that there has been an increase in mass. The results can be used to find the formula of magnesium oxide and two methods are described for doing so.

## A reversible reaction of hydrated copper(II) sulfate

An experiment which removes the water of crystallisation from hydrated blue copper(II) sulfate. After cooling the anhydrous copper(II) sulfate formed is then rehydrated with the same water.

## Finding the formula of hydrated copper(II) sulfate

In this experiment, the water of crystallisation is removed from hydrated copper(II) sulfate. The mass of water is found by weighing before and after heating. This information is used to find x in the formula: CuSO4.xH2O.

## Determining relative molecular masses by weighing gases

Demonstrate how different gases can be weighed in a gas syringe and their relative molecular masses determined using the ideal gas equation.

## The volume of 1 mole of hydrogen gas

Calculate the volume of one mole of hydrogen at room temperature and pressure by  reacting magnesium with hydrochloric acid

## Gas volume

Construct apparatus to measure the molar volume of hydrogen produced from the reaction of magnesium with vinegar.

## The rate of reaction of magnesium with hydrochloric acid

Magnesium reacts with dilute hydrochloric acid in a conical flask which is connected to an inverted measuring cylinder in a trough of water. The volume of hydrogen gas produced is measured over a few minutes, and the results are used to plot a graph.

## A microscale acid-base titration

In this experiment you will be using microscale titration apparatus to complete an acid-base neutralisation. The aim is to calculate the exact concentration of sodium hydroxide solution.

## The ‘whoosh’ bottle demonstration

A mixture of alcohol and air in a large polycarbonate bottle is ignited. The resulting rapid combustion reaction, often accompanied by a dramatic ‘whoosh’ sound and flames, demonstrates the large amount of energy released in the combustion of alcohols.

## The methane rocket

A strong plastic bottle is filled with a 2:1 ratio of oxygen to methane and the mixture ignited with the bottle standing on a suitable ‘launch pad’. The mixture ignites with a loud bang and the bottle flies several metres.