AQA GCSE CHEMISTRY - QUANTATIVE CHEMISTRY

Front

What is a balanced equation?

Back

A balanced equation shows that the number of atoms for each element is the same on both sides of the equation.

Front

What is the relative formula mass?

Back

The relative formula mass is the sum of the relative atomic masses of all the atoms in a formula.

Front

How do you calculate the relative formula mass of Mg(OH)₂?

Back

Add the atomic masses: Mg (24) + 2*O (16) + 2*H (1) = 58.

Front

What is the law of conservation of mass?

Back

The law states that mass is neither created nor destroyed in a chemical reaction.

Front

How many atoms are in a molecule of Cl₂?

Back

There are 2 chlorine atoms in a molecule of Cl₂.

Front

What is the formula for carbon monoxide?

Back

The formula for carbon monoxide is CO.

Front

What is the relative formula mass of CO?

Back

The relative formula mass of CO is 28 (C=12, O=16).

Front

What does it mean to balance a chemical equation?

Back

Balancing a chemical equation means ensuring the same number of each type of atom appears on both sides.

Front

What is the formula for iron oxide?

Back

The formula for iron oxide is Fe₂O₃.

Front

How do you find the number of atoms in a molecule?

Back

Count the subscripts in the chemical formula; if there is no subscript, it is 1.