Gr. 7 Chemistry Final Assessment - Revision

Which of the following are characteristics of acids?

• Turn litmus paper blue

• Turn litmus paper red

• Have pH above 7

• Have pH below 7

Which of the following are characteristics of bases?

• Have sour taste

• Have bitter taste

• Always dissolve in water

• React with acids to form salt and water

What is the colour of universal indicator in hydrochloric acid, pH 2?

• Red

• Yellow

• Green

• Blue

• Purple

What is the colour of universal indicator in sodium hydroxide, pH 12?

• Red

• Yellow

• Green

• Blue

• Purple

What is the colour of universal indicator in ethanoic acid, pH 5?

• Red

• Yellow

• Green

• Blue

• Purple

What is the colour of universal indicator in sodium chloride, pH 7?

• Red

• Yellow

• Green

• Blue

• Purple

Which of these could you use to find out whether a given acid is a strong acid or weak acid?

• Litmus paper

• Methyl orange

• Universal indicator

• pH meter

Neutralisation reaction is a reaction what occurs:

• between an acid and a base.

• when an acid is dissolved in water.

• when a base is heated strongly.

What are the products formed when an acid and an alkali react together?

• Water

• Salt

• Hydrochloric acid

• Universal indicator

Which air pollutant is produced when nitrogen and oxygen in the air react together inside car engines?

• Nitrogen oxides

• Carbon dioxide

• Sulphur dioxide

• Lead