____________ reaction happens when energy is released to the surroundings and the temperature of the surroundings increases.

ΔH is negative for what type of reactions?

chlorine + potassium bromide ==> potassium chloride + bromine           What is this reaction called?

What happens to the density of group 1 metals as you go down the group?

The breaking down of a compound by passing an electric current through it is called ________.

At __________, the rate of the forward and reverse reaction are the same. the rate of the forward and reverse reaction are the same.

A reaction which will proceed in both forwards and backwards directions is called a _____________.

Halogens exist as ___________ molecules. It means that each molecule contains 2 atoms.

When an exothermic reaction takes place, the reaction mixture gives out heat because more energy is ____ when new bonds are formed than is taken in when existing bonds in the reactants are broken.

As you go down group 7, from fluorine to astatine, what happens to the reactivity of the elements?

Energy change in a chemical reaction is represented by the symbol...

What gas is given off when group I elements react with water?