Chemical Reactions

A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products

• Chemical equation

• Formula equation

• Coefficient

A representation of the reactants and products of a chemical reaction by their symbols or formulas

• Chemical equation

• Formula equation

• Coefficient

A small whole number that appears as a factor in front of a formula in a chemical equation

• Chemical equation

• Formula equation

• Coefficient

The process by which one or more substances are changed into one or more different substances.

• Chemical reaction

• Chemical formula

• Chemistry

According to the law of conservation of mass:

• the total mass of reactants must equal the total mass of products for any given chemical reaction.

• the total mass of reactants must be different to the total mass of products for any given chemical reaction.

• the total mass of reactants must be less to the total mass of products for any given chemical reaction.

Chemical reactions are described by chemical equations.

• True

• False

A chemical equation represents, with :

• symbols and formulas

• only symbols

• formulas and words

Select the indicators of chemical reactions

• emission of light

• emission of heat

• formation of gas

• formation of precipitate

• formation of fire

To balance numbers of atoms, add coefficients where necessary.

• True

• False

Identify the type of reaction

• Synthesis reaction

• Decomposition

• Single displacement

• Double-displacement

• Combustion reactions