GCSE 1.5 Formulae and Equations

Which of the following is a diatomic element?

• Carbon

• Hydrogen

• Sodium

• Magnesium

In a chemical reaction, what happens to the atoms?

• Atoms are lost

• Atoms are created

• Atoms are rearranged

• Atoms disappear

Which of the following is NOT a diatomic element?

• Oxygen

• Fluorine

• Bromine

• Carbon

What is the state symbol for an aqueous solution in a chemical equation?

• (s)

• (l)

• (g)

• (aq)

Which of the following is a correct statement about chemical reactions?

• New atoms are created

• Atoms are lost

• Atoms are rearranged

• Atoms disappear

What information does a chemical formula provide?

• The type and number of each atom present in the compound

• The physical state of the compound

• The color of the compound

• The melting point of the compound

How many atoms of sodium are present in the compound Na₂SO₄?

• 1

• 2

• 3

• 4

In the formula Al₂(SO₄)₃, how many atoms of oxygen are present?

• 3

• 6

• 9

• 12

What is the charge on an ion formed by an element in Group 2 of the Periodic table?

• 1+

• 2+

• 3+

• 4+

Which of the following groups forms an ion with a 3- charge?

• Group 1

• Group 2

• Group 5

• Group 7