Matter exists in three states which are solid, liquid, and gas, and the matter can change from one state to another by heating, The change of matter from the solid state to the liquid...
Each substance has its density, The density is a physical property of the matter as each element and compound has its density, and it varies with the temperature and the pressure.
All metals are good conductors of heat and they are different in conducting the heat, which means that some metals conduct the heat faster than the other, The heat makes us comfortable and helps...
The bases (alkalis) The bases are the substances that dissociate in the water producing the negative hydroxide ions (OH–), Examples of some bases such as sodium hydroxide (the caustic soda) NaOH, calcium hydroxide (lime...
