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Both alkenes and alkanes are chains of carbon and hydrogen molecules. The chains can be different lengths and each length chain has a different name. 

An alkene is a chain which has a double bond b...

The different states at room temperature occur as a result of differences in the bonding and structure of chlorine and sodium chloride. In chlorine, there are covalent bonds between individual atoms which...

An atom has no overall charge because each element has the same number of protons and electrons. Protons have a +1 charge, and electrons have a -1 charge, these charges cancel out if there is the same amo...

acid + hydroxide > salt + water

so this makes Sodium Chloride and water

Relative formula mass is the mass compared  of the compound compared with the mass of atoms of other elements. 
Using the periodic table, the individual Ar (relative atomic mass) can help you find t...