What are the kinds of molecules?
The molecules and the matter The molecules of one substance are alike in properties, but they differ from other substance molecules, the molecule is composed of tiny structural units called the atoms, A molecule...
The molecules and the matter The molecules of one substance are alike in properties, but they differ from other substance molecules, the molecule is composed of tiny structural units called the atoms, A molecule...
The metals and chemical activity Metals can be classified according to their chemical activity into three groups which are very active metals, less active metals, and inactive metals.
The electric conductivity The substances can be classified according to the electric conductivity into good conductors of electricity and bad conductors of electricity, The electrical conductivity is the ability of a material to carry...
Hardness of materials Some solid substances are soft at room temperature such as the rubber, and some solid substances need heat to become soft and easy to be shaped such as the metals, and...