AeL - Advanced eLearning :: Chemical and material behaviour

Thermal effects accompanying dissolution

Students are asked to carry out an experiment in order to observe if the temperature of the water increases, decreases or remains constant when into water are inserted potassium permanganate, sulphuric acid or ammonium nitrate.

Factors that favor the dissolution of a solid in water

In order to observe the factors that favor the dissolution of a solid into water, students are asked to carry out an experiment in which they are asked to dissolve grains of copper sulphate and dust copper sulphate into water, then to dissolve cobalt chloride into water at a temperature of 20° and at a temperature of 80° and finally to dissolve sodium carbonate into water in two crystallizer tanks.

Importance of plants for life

Plants are true "live chemical factories", which generate oxygen. In order to prove that the plants consume the carbon dioxide in the cylinder and that their leaves generate oxygen, students are asked to carry out an experiment, following the instructions on the screen.

Methods for corrosion prevention

Students are asked to carry out an experiment in order to prove which are the oxygen proof metals, and how can corrosion be prevented in the case of oxygen non-proof metals.

Corrosion

In this moment, students are asked to carry out an experiment that proves the chemical phenomenon of rusting for bodies made up of iron. In the end, students will have to write down the results of the experiment.

Transformations of substances by changing of composition

Students are asked to carry out a number of experiments in order to prove that the burning of substances takes place with a change of their composition and with their transformation into new substances.

Purify substances by sublimation

Students are asked to perform an experiment in order to learn more about the sublimation phenomenon. The substances used are Naphthalene and the benzoic acid (a food preservative) that have the property of sublimating.

Purifying substances by distillation

Students learn that substances can be purified by distillation (physical method). They are asked to perform a practical experiment of the theoretical notions by distilling a mixture of water and alcohol.

Pure substances and impure substances

Students learns, using a practical exercise, that substances can be pure or impure. They are asked to dissolve two pieces of sugar, one pure and one impure with coal dust. After the dissolution of the impure piece of sugar, students notice the residue left on the bottom of the beaker.

Separation of substances in a solid-liquid mixture by filtering

Students learn how to create a filtering installation and also how to make an adequate filter using a square paper. They will be asked to filter a mixed solution using the installation created earlier.