Starter – What do these hazard symbols mean? You need to know what all these symbols mean to keep...
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Transcript of Starter – What do these hazard symbols mean? You need to know what all these symbols mean to keep...
Starter – What do these hazard symbols mean?
You need to know what all these symbols mean to keep you safe in science.
Harmful
These chemicals are similar to toxic chemicals but are less dangerous.
Irritant
These chemicals cause redness or blistering of the skin.
Oxidising agent
These chemicals help other chemicals to burn more fiercely.
Corrosive
These chemicals attack and destroy living tissue including the eyes and skin.
Toxic
These chemicals can cause death.
They may have their effects when swallowed, absorbed through the skin or breathed in.
Flammable
These chemicals catch fire easily.
Radioactive
These substances can cause burns and cancer.
Harmful to the environment
These chemicals will damage plant or animal life.
Signs used in the Lab
How many can you recognise?
Lesson Objectives
•Recall what different hazard warning symbols mean. (Level 3)•Name some common acids and alkalis. (Level 4)•Evaluate different uses for acids and alkalis (Level 5)
Copy these headings and write AS MUCH AS YOU CAN about what you already know.
Acid Alkali
They are chemicals
They react with each other
They can be concentrated or dilute
Concentrated acids can be corrosive
Concentrated alkalis can be caustic
They are measured using the pH system
Foods - Berries and citrus fruits are acidic. They contain Citric acid. Bicarbonate of soda and chocolate are alkaline.In the body-Stomach juices are acidic. They contain Hydrochloric acid.Pancreatic juices are alkaline.Cleaning products-Products containing ammonia are alkalineProducts containing vinegar are acidic. They contain Ethanoic acid.
A bee sting is acidic, a wasp sting is alkaline
Write an account of what life would be like without acids or alkalis.