Chemical Change Wave 1

What is the pH of acids?

• 2

• Neutral

• Below 7

• 1-6

What ion do all acids release?

• Acid ion

• Hydroxide ion

• OH^-

• H⁺

Which of these is an alkali?

• Sodium hydroxide

• Bleach

• Toothpaste

• Sodium oxide

Universal indicator will turn what colour when its added to a substance with pH = 7

• Green

• Red

• Purple

• Yellow

Universal indicator will turn what colour when its added to a substance with pH = 14

• Green

• Red

• Purple

• Yellow

Universal indicator will turn what colour when its added to a substance with pH = 5

• Yellow

• Purple

• Red

• Green

What is the pH of a weak acid?

• pH = 1

• pH = 4

• pH = 7

• pH = 8

What is the reaction of an acid and a base called?

• Displacement

• Oxidation

• Base reaction

• Neutralisation

What is the correct ionic equation for neutralisation

• H⁺ + OH^- → H2O

• H + OH → H₂O

• H⁺ + OH^- → H₂O

• H^- + OH⁺ → H2O

Acid + alkali → ?

• Salt and hydrogen

• Salt and water

• Water and hydrogen

• Salt and hydrogen and water