Formulae and equations - Edexcel

1

Which element has a formula that shows its molecules contain two atoms joined together?

2

What is the correct formula for ammonia?

3

Which of the following compounds is made up of molecules that contain five atoms?

4

Which of these compounds is most likely to contain ions?

5

What is the correct formula for sodium oxide, which is formed by joining positive sodium ions (Na+) to doubly negative oxide ions (O2-)?

6

What is the word equation for a reaction where hydrogen and carbon monoxide are the products, and water and carbon are the reactants?

7

Which equation shows a substance dissolved in water reacting to form a gas?

8

In this unbalanced symbol equation: Na + Cl2 → NaCl what is the correct balanced equation?

9

Which equation is balanced correctly?

10

Which ions can be missed out when writing this ionic equation?

AgNO3(aq) + KBr(aq) → AgBr(s) + KNO3(aq)