Y7 Chapter 5 Properties of materials

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.

What colour is Universal indicator when the solution is neutral?

• Red

• Green

• Blue

• Purple

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

• combustion

• decomposition

• no reaction

• neutralisation

Excess acids in stomach can be neutralized using ............

• antacid

• vinegar

• slaked lime

• hydrochloric acid

_____ has a neutral pH

• Bleach

• Water

• Orange Juice

• Blood

The pH scale ranges from

• 1-7

• 0-14

• 0-20

• 1-14

What colour does universal indicator turn to indicate a substance is strongly alkaline?

• red

• orange

• blue

• purple

What colour does universal indicator turn to indicate a substance is strongly acidic?

• red

• orange

• blue

• purple

What pH represents a neutral solution?

• 0-6

• 7

• 8-14

• 0-14

Brass is an alloy consisting of a mixture of

• copper and zinc

• copper and lead

• copper and tin

• tin and lead