CHEMISTRY YEAR 7 MID-TERM 3 EXAM 2020

Name the acid found naturally in citrus fruits.

• Ethanoic Acid

• Sulphuric Acid

• Citric Acid

• Hydrochloric Acid

What is the taste of acids?

(a)  

Acids can be corrosive and must be handled with care.

• True

• False

Acids turn red litmus paper blue.

• True

• False

Alkalis are used for making soaps.

• True

• False

What is the taste of alkalis?

(a)  

What is the pH of distilled water?

• pH 12

• pH 3

• pH 8

• pH 7

What colour does litmus paper turn when added to an alkali?

• Blue

• Red

• Green

• Colourless

What other laboratory substance can you use to test if colourless substance is an acid or an alkali?

• Catalyst

• Salt

• Universal Indicator

• Water

A wasp sting is alkali. Which substance would neutralise the sting?

• Vinegar

• Bleach

• Baking soda

• Distilled water