Abridged Science for High School Students. The Nuclear by H. Messel

By H. Messel

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Extra resources for Abridged Science for High School Students. The Nuclear Research Foundation School Certificate Integrated, Volume 2

Sample text

If you study these graphs carefully you will see that• Not all solids increase in solubility when the temperature is raised. � . 70 60 • 40 '" __;; /: f::;-� . 2. Place equal quantities of sugar into separate equal quantities of water in two test tubes. Shake one tube and leave the other to stand . Compare the rates at which the samples dissolve. ,__ f. 3. Place equal quantities of potassium nitrate­ saltpetre-in equal quantities of water in two test tubes. Shake both test tubes, holding one of them over a flame.

4. Using the apparatus shown in Figure 24. 1 , discover whether dilute aqueous solutions of sodium chloride, alcohol, sugar, copper sulphate, sodium nitrate, sodium hydroxide and sulphuric acid are conductors or non­ conductors. Decide, also, whether solutions of olive oil, lard and iodine in carbon tetrachloride are conductors. Aqueous solutions of acids, alkalis and salts are generally good conductors of electricity. For instance, you found that aqueous solutions of the salts sodium chloride, copper sulphate and sodium nitrate ; of the alkali, sodium hydroxide ; and of the acid, sulphuric acid are good conductors.

If too large a distorting force is used, then the material may he strained beyond its elastic limit and plastic deformation or fracture may occur. In this case the particles have been pulled so far apart that inter-particle forces become too weak to return the particles to their original positions. bench . Can you explain why the particles fly off the rod ? 1 2. Describe the tests you would carry out on a lump of paraffin wax in order to find out if it contained i onic or molecular particles. 1 3 .

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