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Category: Science and Technology
Date Submitted: 02/26/2011 09:25 PM
Science Test
Hazardous Household Product Symbols (HHPS):
- were developed to indicate why and to what degree a product is dangerous
(study diagrams on Blackline Master 5.1c)
Workplace Hazardous Materials Information System (WHMIS):
- were developed to standardize the labelling of dangerous materials used in all workplaces
(study diagrams on Blackline Master 5.1c)
Physical Properties:
- a characteristic or description of a substance that may help to identify it
The States of Matter –
Solid – Definite shape: has a fixed unchanging shape
Definite volume: has a fixed volume
Liquid – Indefinite shape: always takes the shape of its container
Definite volume: has a fixed volume
Gas – Indefinite shape: always takes the shape of its container
Indefinite volume: always fills the entire container
Hardness – a measure of the resistance of a solid to being scratched or dented.
Examples: a harder material will scratch or dent a softer one, but not vice versa; diamond is used to cut glass because it is harder than it.
Malleability – it can be hammered or bent into different shapes.
Examples: aluminium foil is malleable so it’s useful for wrapping food in it as it cooks; if an object is not malleable (it shatters when hammered) it is brittle.
Ductility – it can be pulled into wires.
Examples: copper is used for electrical wiring because it can be drawn out into long thin wires.
Melting and Boiling Point - the temperatures at which substances change state.
Examples: water always changes from liquid to solid ice at 0 degrees Celsius (freezing point is 0 degrees Celsius); boiling point is 100 degrees Celsius (when it changes from liquid to vapour)
Crystal Form – are the solid forms of many minerals in which you can see a definite structure of cubes or blocks with a regular pattern.
Examples: when you look closely at salt crystals, you can see tiny cubes; when you look closely at sodium thiosulphate, you can see...