Science

What are the types of chemical reactions?

Combination, Decomposition, Single Displacement, Double Displacement, and Combustion.

What is a Combination reaction?

A+B→AB.

What is a Decomposition reaction?

AB→A+B.

What is a Single Displacement reaction?

A+BC→AC+B.

What is a Double Displacement reaction?

AB+CD→AD+BC.

What indicates that a chemical reaction has taken place?

Change in colour, smell, bubbles, temperature change, and change of state.

What is a carbonic acid salt known as?

A carbonate.

What is the general word equation for a carbonate reaction?

Acid + carbonate → salt + water + carbon dioxide.

Which metal is the least reactive?

Gold.

What is a nugget?

A pure lump of a precious metal.

What are the products formed in a reaction with a metal and acid?

A salt and hydrogen.

What is an example of oxidation in an equation?

‘metal’ + oxygen → ‘metal’ oxide.

What is precipitation in chemical reactions?

A reaction in which substances in a solution are mixed and an insoluble product is formed.

What does the conservation of mass state?

You can't create or destroy atoms.

Modules of chemical reactions

If it has 1 electron it has 7 hands because it needs 7 more to get to 8