Formulae and equations - Eduqas

1

What is the correct symbol for the element copper?

2

Which of these elements exists as a molecule with two atoms joined together?

3

Sulfur dioxide is a compound that contains one sulfur atom and two oxygen atoms. What is the formula of sulfur dioxide?

4

Barium is in group 2 of the periodic table. What will be the charge on a barium ion?

5

Copper ions have a 2+ charge and hydroxide ions have a 1- charge. What is the formula of copper hydroxide?

6

Aluminium chloride has the formula AlCl3. What is the Mr of aluminium chloride? (Atomic masses: aluminum = 27, chlorine = 35.5)

7

The diagram shows a CFC molecule. CFCs are compounds that can be used as refrigerants. What is the empirical formula of this CFC?

The covalent structure of a CFC molecule.

8

Which of these represents a solution of sodium chloride in water?

9

Which of these equations is balanced?

10

Which of these equations shows the formation of a precipitate of copper carbonate from copper ions and carbonate ions? - Higher