Salts, acids and alkalis

What are the products if the reactants are sodium carbonate and nitric acid? (check all that apply)

• Sodium nitrate

• Carbon dioxide

• Water

• Hydrogen

An alkali is an

What is the gas produced from a Acid + Metal reaction?

• water vapour
• carbon dioxide gas (CO₂)
• hydrogen gas (H₂)
• oxygen gas (O₂)

The reaction between an acid and a base or an acid and an alkali is referred to as a neutralisation. This is because:

• The reaction cancels itself out and nothing actually changes

• The reactants have pHs which are not 0 (neutral), but the products all have pHs of 0 (neutral).

• All of the reactants are neutral in colour

• The reactants have pHs which are not 7 (neutral), but the products all have pHs of 7 (neutral).

The image shows a PH scale. Which option indicates strong alkali?

• a

• b

• c

• d

_{What is the hazard shown in this hazard sign?}

• Explosive
• Corrosive
• Irritant
• High level Irritant

The pH scale is a range from:

• 1-7

• 0-14

• 1-20

You have an acidic solution. If you add an alkali to it, what will happen to the pH?

• It will increase

• It will decrease

• It will not change

• It will become 7

Acids taste _________________.

• sour

• spicy

• sweet

• bitter

Hydrochloric acid + Potassium hydroxide -->

• Hydrochloric potassium + Hydrogen

• Potassium chloride + Water

• Potassium Acid + Chlorine

• Potassium Sulfate + Water