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Do now!. Can you spell the following words correctly in the back of your book? Nuetralisasion, indicater, litmas, alkcali, burete. Acids and alkalis. What have you learnt?. Acid tastes. Acid tastes. - PowerPoint PPT PresentationTRANSCRIPT
Do now!
Can you spell the following words
correctly in the back of your book?
Nuetralisasion, indicater, litmas, alkcali, burete.
Acids and alkalis
What have you learnt?
Acid tastes
Acid tastes
Acid comes from the latin word acer, which means sharp. Acids are sharp tasting! (“Tangy”)
Indicators
Indicators are chemicals (coloured dyes) which change colour in acids and alkalis.
Litmus
Turns red in acid
Turns blue in alkali
Litmus
Turns red in acid
Turns blue in alkali
Litmus can tell us if something is an acid or an alkali, but it cannot tell us how strong the
acid or alkali is
Other indicators
Red cabbage and beetroot make excellent indicators
The pH scale
The strength of an acid is measured on the pH scale
pH stands for the “potential of hydrogen”
Universal Indicator
To measure pH, we need an indicator that has a different colour for each value of pH
Universal Indicator
Universal Indicator
It comes in the form of a paper
Universal Indicator
It also comes in the form of a liquid
Neutralisation
Neutralisation
What happens when we add an acid to an alkali?
Neutralisation
Acid + alkali salt + water
Both neutral
Examples of neutralisation
Chemical Hazard Symbols
• Corrosive – dissolves metals, stone and skin
• Irritant – harms eyes and skin
• Flammable – burns easily
• Toxic – poisonous
Summary sheet
Can you stick the summary sheet into your books?
Summary exercise
Read pages 64 and 65
Abigail Tom
Read pages 64 and 65
Abigail Tom
Can you now write 6 multiple choice questions to go with these pages
Multiple choice questions
What is a burette used for?
Multiple choice questions
What is a burette used for?
A. to add measured amounts of a liquid
Multiple choice questions
What is a burette used for?
A. to add measured amounts of a liquid
B. to stir reactants together
Multiple choice questions
What is a burette used for?
A. to add measured amounts of a liquid
B. to stir reactants together
C. to grind solids into a powder
Multiple choice questions
What is a burette used for?
A. to add measured amounts of a liquid
B. to stir reactants together
C. to grind solids into a powder
D. to make french toast
Read pages 64 and 65
Abigail Tom
Can you now write 6 multiple choice questions to go with these pages
TEST
We will be having an acids and alkalis TEST on Monday 17th December