Science 8f: Compounds and Mixtures

When substances react with oxygen they form
1. oxides
2. chlorides
3. hydroxides
4. sulphides
When substances react with chlorine they form
1. chlorides
2. oxides
3. chlorates
4. nitrates
When substances react with carbon and oxygen they form
1. carbonates
2. carbonides
3. oxides
4. sulphates
When substances react with sulphur and oxygen they form
1. sulphates
2. carbonates
3. nitrates
4. sulphides
When substances react with nitrogen and oxygen they form
1. nitrates
2. carbonates
3. chlorates
4. sulphates
When substances react with iodine they form
1. iodides
2. bromides
3. oxides
4. chlorides
When substances react with sulphur they form
1. sulphides
2. carbonides
3. oxides
4. sulphates
Which of these is not present in Zinc Sulphate
1. carbon
2. zinc
3. sulphur
4. oxygen
Which of these is not present in Copper Sulphate
1. hydrogen
2. copper
3. oxygen
4. sulphur
Not a property of mixtures
1. fixed composition
2. easy to separate into elements
3. composition can vary
4. made of two or more substances
Not a property of compounds
1. easy to separate into elements
2. fixed composition
3. one substance only
4. difficult to separate into elements; a reaction is needed
Fractional distillation separates mixtures uses the fact that different substances have different
1. boiling points
2. melting points
3. densities
4. smells
Which of these would not be used to get pure water from salty water
1. chromatography
2. evaporation
3. condensation
4. distillation
Which of these modifications will help magnesium burn quickly as seen in fireworks?
1. make it into a fine powder
2. clump it together in one big lump
3. mix it with another metal
4. heat it up more
When we mix two or more metals together we make
1. an alloy
2. an element
3. a mixture
4. it weaker
The boiling point of a substance is
1. always higher than the melting point
2. always lower than the melting point
3. usually but not always higher than the melting point
4. lower than the freezing point
The boiling point of a substance is
1. the point at which the substance turns from a liquid to a gas
2. the point at which the substance turns from a gas to a solid
3. the point at which the substance turns from a liquid to a solid
4. the point at which the substance turns from a solid to a gas
If a substance sublimes then it doesn't have a
1. liquid form
2. solid form
3. gas form
4. backbone
Aristotle came up with a theory that substances were made up from various parts. One of these was not part of his theory
1. ash
2. water
3. earth
4. fire
For a pure substance the melting and boiling point are always
1. constant
2. equal
3. different
4. within 5 degrees C of each other
Alchemists were obsessed with turning metals such as lead into
1. gold
2. water
3. silver
4. tin
What percentage of the air is oxygen
1. 21%
2. 78%
3. 18%
4. 1%
A centrifuge can be used to separate
1. the blood cells from the plasma
2. different coloured inks
3. the sulphur from sulphuric acid
4. salt from salty water
Which of these can be used to separate out different coloured inks
1. chromatography
2. colourimetry
3. filtration
4. condensation
Solids can be separated out from liquids by
1. filtering
2. dissolving
3. chromatography
4. fractional distillation
When scuba divers rise to the surface to quickly dissolved nitrogen can come out as bubbles in the blood. This is called
1. the bends
2. bubbling
3. corners
4. fizzing
Which of the following is not made from crude oil
1. metals
2. plastics
3. petrol
4. lubricating oil