A compound contains one atom of nitrogen and three atoms of hydrogen. What is the correct chemical formula?

• NH₃

• NH^3

• N₃H

• NH3

The formula for calcium hydroxide is Ca(OH)₂. How many atoms of each element are present?

• 1 x calcium, 2 x hydroxide

• 1 x calcium, 2 x oxygen, 2 x hydrogen

• 1 x calcium, 1 x oxygen, 2 x hydrogen

• 2 x calcium, 2 x oxygen, 2 x hydrogen

When describing a word equation, which statement is correct?

• Products on the left of the arrow, reactants on the right

• Products on the right of the arrow, reactants on the left

• Products and reactants can go anywhere you like

Which of the following is a property of ALL acids?

• They taste sour

• They are corrosive

• They feel soapy

• They are flammable

Which of the following is a property of ALL alkalis?

• They taste sour

• They are corrosive

• They feel soapy

• They are flammable

What is an indicator?

• The flashing light on a car that signals a change of direction

• A chemical that is a different colour in acids and alkalis

• An acid or an alkali

What type of substance has a pH of 7?

• Acid

• Alkali

• Neutral

What type of substance has a pH of 14?

• Acid

• Alkali

• Neutral

What type of substance has a pH of 1?

• Acid

• Alkali

• Neutral

What colour does universal indicator turn in a neutral substance?

• Green

• Red

• Yellow

• Purple