KS3 Y7 Activate C4: Acids and Bases

What are acids?

• Solutions with pH greater than 7

• Solutions with pH less than 7

• Solutions with pH equal to 7

• Solutions that are always solid

What are bases?

• Substances that can react to cancel out acids

• Substances that are always liquids

• Solutions with pH less than 7

• Substances that only react with metals

What are alkalis?

• Soluble bases with pH less than 7

• Soluble bases with pH greater than 7

• Acids that are safe to touch

• Substances that do not react with acids

Which of the following is NOT a household acid?

• Vinegar

• Lemon juice

• Bleach

• Fizzy drinks

Which of the following is a common household alkali?

• Lemon juice

• Vinegar

• Toothpaste

• Fizzy drinks

What hazard is associated with working with lab acids and alkalis?

• They are flammable

• They are corrosive

• They are explosive

• They are toxic

What pH do neutral solutions have?

• pH 6

• pH 7

• pH 8

• pH 9

What is an indicator?

• A type of acid

• A chemical that changes colour depending on the pH of the solution

• A base that does not dissolve in water

• A solid substance

What colour does Universal Indicator turn in acids?

• Blue

• Green

• Red, orange or yellow

• Purple

What colour does Universal Indicator turn in neutral solutions?

• Red

• Blue

• Green

• Yellow