Grade 6 7.4 Neutralisation

products of a neutralisation reaction are always

• an acid and a base
• an acid and a salt
• salt and water
• salt and base

Pure water has a pH of 7. Pure water _______.

• is a base
• is a neutral substance
• could be either an acid or a base
• is an acid

What type of reaction occurs when you react an acid with an alkali?

• combustion

• decomposition

• no reaction

• neutralisation

What colour is Universal indicator when the solution is neutral?

• Red

• Green

• Blue

• Purple

What sort of reaction happens when an acid and an alkali are mixed?

• Neutralisation

• Combination

• Acidifying

• Displacement

Why is toothpaste alkaline?

• It can neutralise strong alkaline in

  your mouth

• It can neutralise acid in

  your mouth

• It can refresh your teeth

• Toothpaste is not alkaline.

Where does the acid in you mouth come from?

• From stomach

• From stomach acid

• From the millions of

  bacteria of mouth

• From the teeth

... are used to neutralise acid in the stomach.

• Toothpastes

• Bacterias

• Antacids

• More strong acids

... put a question for investigation in a way that can be tested.

• Scientists

• Builders

• Socialists

• Writers

What colour is litmus in solution of pH 4?

• green

• red

• blue

• dark blue