Y9 GCSE pH Scale - YouTube video

What does litmus paper indicate?

• The exact pH value of a substance

• The viscosity of a substance

• Whether a substance is acidic or alkaline

• The temperature of a substance

What color does blue litmus paper turn in acidic conditions?

• Blue

• Red

• Yellow

• Green

What is the pH value of neutral substances?

• 10

• 14

• 7

• 0

Which of the following is a strong acid based on its pH value?

• Stomach acid

• Soapy water

• Milk

• Seawater

What does the universal indicator show?

• The viscosity of a substance

• The temperature of the solution

• Only if a substance is acidic or alkaline

• The pH value of the solution

Which substance is slightly alkaline?

• Seawater

• Stomach acid

• Bleach

• Acid rain