Chemistry Review 2

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

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

ΔH is negative for what type of reactions?

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

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

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

What is the transition metal used as a catalyst(to convert carbon monoxide to carbon dioxide) in the car exhaust?

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

The reactivity of group I elements ______ down the group.

What is the reaction in which an acid reacts with a base or alkali to form a salt and water called?

Why does an electrolyte need to be either molten or in solution?

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

_____ reaction happens when energy is absorbed from the surroundings and the temperature of the surroundings decreases

When an acid and an alkali react, a salt and water are formed. What is the salt produced when ammonium hydroxide reacts with nitric acid?

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

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

The minimum amount of energy required by particles to react is called the _________.

When a group 1 element reacts with water, a hydroxide is formed. What colour could Universal Indicator turn in this solution?

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

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.