Do now!

Can you take a look at your evaporating

dishes with your copper sulphate in?

Last lesson

• Writing word equations for making salts by neutralisation

• Making Copper sulphate

Making Copper sulphate

Acid + Base “salt” + water

Hydrochloric acid + sodium hydoxide sodium chloride + water

Sulphuric acid + Potassium hydroxide Potassium sulphate + water

Nitric acid + ammonia ammonium nitrate + water

In general, hydrochloric acid makes a chloride, nitric acid makes a nitrate, and sulphuric acid makes a sulphate.

Today’s lesson

• An indicator exercise

• The reactivity series

Indicators

Indicators are chemicals (coloured dyes) which change colour in acids and alkalis.

Universal Indicator

To measure pH, we need an indicator that has a different colour for each value of pH

Universal Indicator

Mission impossible?

Mission impossible?

Your task is to produce the colours of the rainbow in 6 test tubes using only Universal Indicator liquid and the acids and alkalis provided.

Mission impossible?

Mission impossible?

The first group to succeed will receive 3 house marks each

Mission impossible?

Use SMALL amounts – it’s easier!

Don’t forget safety glasses!

Mission impossible?

Go!

Reactivity Series

• YouTube - Rubidium and Cesium in water

• YouTube - Alkali metals in water ( Not the braniac version )

• YouTube - Brainiac Alkali Metals

• Alkali Metal Bangs

Could you quietly and sensibly gather your stools around Mr

Porter?

Reactivity Series

Reactivity Series

• potassium• sodium• lithium• calcium• magnesium• aluminium• zinc• iron• tin• lead• copper• silver• gold

Can you compose a sentence to help you remember this order? (important)