All Compounds and mixtures articles – Page 4

Experiment
Recovering water from a solution using a condenser

In association with Nuffield Foundation

Use this demonstration to show how pure water can be recovered from copper sulfate solution using a condenser. Includes kit list and safety instructions.
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Making concrete

In this experiment, students determine how different sized materials with binder increase the stability and strength of mortar and concrete. Also, students can test how altering the proportions of cement, water and different aggregates affects concrete’s properties.
Experiment
What ions cause hardness in water?

In association with Nuffield Foundation

Investigate how different cations and anions in dissolved salts affect the formation of a lather in this experiment. Includes kit list and safety instructions.
Experiment
Separating salts from seawater

In association with Nuffield Foundation

Try this simple practical to show that seawater contains a mixture of different salts. Includes kit list and safety instructions.
Experiment
A reversible reaction of hydrated copper(II) sulfate

In association with Nuffield Foundation

A class practical which investigates the reversible reaction of hydrated copper(II) sulfate. Includes kit list and safety instructions.
Experiment
What are the dissolved solids in seawater?

In association with Nuffield Foundation

Analyse the salts that crystallise from evaporating seawater, illustrating cation and anion tests in this demonstration. Includes kit list and safety instructions.
Resource
Oil and water mix

In this practical, students predict and observe what happens when water and alcohol, and water and oil are mixed.
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Making an oil-water emulsion

Students observe what happens when oil and water are mixed, and how the results of the experiment change when various substances, including an emulsifier, are added.
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Tyndall effect- why the sky is blue

In this experiment, students observe and report on the Tyndall effect. Also, students use their knowledge of the properties of mixtures and emulsions, and light to explain their observations.
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Making marbled paper

In this practical, students create a marble effect on paper, using their knowledge of mixtures and hydrophobic solutions to explain the phenomena. Also, students use their evaluating skills to determine which method produces the best result.
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Tie dye milk

This investigation looks at the topic of surface tension in a colourful way, where students create a tie dye effect with milk, water, washing up liquid and food colouring.
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Water drop art

In this practical, students observe and report what happens when water is placed on waxed paper, and a splint or toothpick is positioned close to the droplets.
Resource
The Chemistry of Light: Part 1

A series of short experiments and demonstrations about the chemistry of light, taken from a lecture by Peter Wothers from the University of Cambridge Video: The Chemistry of Light: 01 - Introduction Video: The Chemistry of Light: 02 - Oil Lamps & Candles ...
Resource
Solutions

This activity is designed to develop the students’ higher order thinking – particularly critical thinking skills – in the context of dissolving and solutions. The students have to apply some particle theory and logical reasoning to simple experimental observations.
Experiment
Recovering water from copper(II) sulfate solution

In association with Nuffield Foundation

Try this practical to introduce students to aqueous solutions by distilling water from copper(II) sulfate solution. Includes kit list and safety instructions.
Experiment
Which substances conduct electricity?

In association with Nuffield Foundation

In this class practical, students test the conductivity of covalent and ionic substances in solid and molten states. Includes kit list and safety instructions.
Experiment
How can hardness in water be removed?

In association with Nuffield Foundation

Investigate the effects of three treatments for softening hard water in this class practical and demonstration. Includes kit list and safety instructions.
Experiment
Emulsifiers in the kitchen

In association with Nuffield Foundation

Test a range of common ingredients to see which ones stabilise an oil and water emulsion in this class practical. Includes kit list and safety instructions.
Experiment
Making solder as an alloy of tin and lead

In association with Nuffield Foundation

Try this practical to make solder by heating together the metals tin and lead before investigating the alloy’s properties. Includes kit list and safety instructions.
Experiment
Extracting iodine from seaweed

In association with Nuffield Foundation

Discover how ribbon seaweed (or kelp) can be used as a source of iodine in this demonstration or class experiment. Includes kit list and safety instructions.