KITCHEN SCIENCE Flashcards
Know the Cleopatra example well
Do you know it?
How is a pearl formed?
An intruder like a grain of sand gets into the oyster.
Calcium carbonate is deposited around the intruder in concentric circles over a period of time to produce a pearl
What is limestone mostly made of?
Calcium carbonate
What does corrosive mean?
A substance that will damage or destroy other substances with which it comes into contact with
What do scientists use to tell if a liquid is an acid or an alkali?
An indicator which turns different colours
What is the name of one of the most useful indicators?
Universal indicator
What is a universal indicator?
A mixture of dyes which has a wide range of colours depending on how strong the acid or alkali is
How can a universal indicator be used?
- As a solution
- Soaked into paper
- The colour of the solution/paper is then compared to a colour chart to give the pH of the substance
What is a pH scale?
A scale which shows how acidic or alkaline a substance is
Name another commonly used indicator
Litmus/Litmus paper
What colour does acid turn Litmus indicator solution?
RED
What colour does an alkali turn Litmus indicator solution?
BLUE
What colour does a neutral substance turn Litmus indicator solution?
PURPLE
What is the most accurate way of measuring the pH of a solution?
A data logging pH sensor
