Chemical Reactions - Red Cabbage Indicator

What is a chemical reaction?

• When something gets wet

• When two substances mix and stay the same

• When substances mix and make something new

• When something is broken into pieces

What are some signs that a chemical reaction has happened?

• Colour change

• Fizzing or bubbling

• Change in temperature

• All of the above

What is an indicator?

• A type of clothing

• A tool to stir mixtures

• A substance that changes colour with acids or bases

• A smell you notice during a reaction

Which of these is an acid?

• Laundry detergent

• Red cabbage

• Lemon juice

• Water

Which of these is a base?

• Vinegar

• Lemon juice

• Powdered laundry detergent

• Orange juice

What colour does red cabbage indicator turn when mixed with lemon juice (an acid)?

• Green

• Light red or pink

• Blue

• Yellow

What colour does the indicator turn when mixed with laundry detergent (a base)?

• Purple

• Red

• Green

• Orange

What’s the difference between a physical change and a chemical change?

• Physical changes make new substances

• Chemical changes are easy to undo

• Physical changes don’t make new substances

• Chemical changes are always cold

Why is red cabbage used in the experiment?

• It tastes good

• It’s a colourful vegetable

• It’s a natural indicator

• It makes things smell better

What is the secret writing experiment using cabbage and detergent an example of?

• A prank

• A magic trick

• A chemical reaction that changes colour

• Physical change using ink