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A change in the concentration of reactants or products per unit time

Ionic bonding occurs between positive and negatively charged ions. A simple example is Sodium Chloride. Sodium has 1 outer shell electron which it wants to lose in order to create a stable electronic conf...

C_nH_2n+2C₇H₁₆Heptane

A fully-marked answer would contain each of these points, or clear diagram equivalent
10 protons10 neutrons10 electrons, arranged with 2 in the inner 's' shell and 8 in the 'p' shell

The group 7 elements become less volatile as you go down the group. This is because as you go down the group the molecules become larger and contain more electrons. Therefore there are Greater London forc...