Past paper 3

• Lithium is a good conductor of electricity and forms a basic oxide
• When lithium is added to water it slowly fizzes, hydrogen gas is produces and it turns to a ball
• When sodium is added to water it quickly turns to a ball, moves quickly and fizzes
• When potsssium is added to water, a lilac flame is produced and it is more vigorous reaction
• Group one elements have similar reactions because they all have one electron is their outer shells so are all reactive with air and water
• Oxygen makes up 21% of air
• Sir is a mixture of many different gases
• Helium can be better than hydrogen becaus it’s not explosive