A pure substance is one that contains only one type of substance, i.e. only one type of atom or molecule. A mixture contains two or more different substances physically combined together. They can be separated by different methods of purification. Dissolving,...
Testing the Purity of substances: A pure substance has a fixed and exact melting point. A pure substance has a fixed and exact boiling point. A pure substance shows only one spot on a chromatogram.
II). Collection of Gases: Speed of Chemical Reactions: In a chemical reaction where a gas is given off, we can measure the speed of the reaction by recording the volume of gas given off in a certain time interval, which can be measured using a gas syringe, or by...
I). Measurements: The study of chemistry requires the measurement of various quantities, such as mass and volume. Mass: The mass of a substance is the amount of matter it contains. Its unit is the gram (g) for small amounts or the kilogram (kg) for larger amounts. It...