Y9 Units 1-3 revision

Front

If 24g of magnesium reacts with 16g of oxygen, how much magnesium oxide is made?

Back

40g

Front

The term conservation of mass means:

Back

The mass of the reactants must equal the mass of the products.

Front

Mass is conserved in a chemical reaction because:

Back

No atoms are made or destroyed in a chemical reaction.

Front

What are the substances on the left-hand side of an equation called?

Back

Reactants

Front

Why are equations balanced?

Back

Because atoms are never created or destroyed, simply rearranged during a reaction.

Front

Location of sub-atomic particles in the atom

Back

Proton - nucleus, Neutron - nucleus, Electron - shells

Front

Where are the sub-atomic particles found in the atom?

Back

Proton - nucleus, Neutron - nucleus, Electron - shells

Front

Atoms have no overall charge because....

Back

They have equal numbers of protons and electrons.

Front

The charge of an electron is....

Back

-1

Front

The charge of a proton is....

Back

+1