8499863
Descripción
Test por Lily O'Brien, actualizado hace más de 1 año
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Creado por Lily O'Brien
hace más de 7 años
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Pregunta 1
Pregunta
The number of protons equals
Respuesta
-
The number of electrons
-
The number of neutrons
Pregunta 2
Pregunta
Limestone is mainly
Respuesta
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Sodium carbonate
-
Calcium carbonate
-
Magnesium carbonate
Pregunta 3
Pregunta
Metals are:
Choose 3
Respuesta
-
Good conductors of electricity
-
Colourful when molten
-
Strong
-
Good conductors of heat
Pregunta 4
Pregunta
Alloys are softer than pure metals
Respuesta
- True
- False
Pregunta 5
Pregunta
Crude oil is mainly made up of hydrocarbon molecules
Respuesta
- True
- False
Pregunta 6
Pregunta
Sulphur dioxide causes acid rain
Respuesta
- True
- False
Pregunta 7
Pregunta
Cracking means splitting up long- chain hydrocarbons
Respuesta
- True
- False
Pregunta 8
Pregunta
Polymers are:
Choose 3
Respuesta
-
Cheap
-
Expensive
-
Most aren't biodegradable
-
Biodegradable
-
Most don't rot
Pregunta 9
Pregunta
Choose every right answer about vegetable oils (3)
Respuesta
-
Have benefits for cooking
-
Used in detergents
-
Used to produce fuels
-
Used in food
Pregunta 10
Pregunta
Unsaturated oils contain double bonds
Respuesta
- True
- False
Pregunta 11
Pregunta
Hydrophilic ends of an emulsifier latch onto oil molecules
Respuesta
- True
- False
Pregunta 12
Pregunta
Why wasn't Wegner's theory of continental drift accepted for many years? Choose 2
Respuesta
-
He had got his facts mixed up
-
He had used inaccurate data in his calculations
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Many believed it to be impossible
-
he was ahead of his time
Pregunta 13
Pregunta
The centre of the Earth is mainly made of iron and nickel
Respuesta
- True
- False
Pregunta 14
Pregunta
The early atmosphere was mainly
Respuesta
-
methane
-
oxygen
-
carbon dioxide
-
nitrogen
Pregunta 15
Pregunta
Ethanol can be produced from plant materials
Respuesta
- True
- False
Pregunta 16
Pregunta
Biodiesel can be produced from vegetable oils
Respuesta
- True
- False
Pregunta 17
Pregunta
The mass number is the total number of protons and electrons
Respuesta
- True
- False
Pregunta 18
Pregunta
The atomic number tells you the number of protons or electrons
Respuesta
- True
- False
Pregunta 19
Pregunta
Emulsifiers stop emulsions from seperating out and this gives them a longer shelf life. They allow food companies to produce food lower in fat
Respuesta
- True
- False
Pregunta 20
Pregunta
No one is known to be allergic to emulsifiers so they can be very useful
Respuesta
- True
- False
Pregunta 21
Pregunta
Convection currents in the mantle cause plates to drift
Respuesta
- True
- False
Pregunta 22
Pregunta
The oceans formed when the water vapour condensed
Respuesta
- True
- False
Pregunta 23
Pregunta
the oceans are a natural store of carbon dioxide, however the amount of CO2 we're releasing is making them too acidic
Respuesta
- True
- False
Pregunta 24
Pregunta
Polymers are:
Choose 2
Respuesta
-
Very durable
-
Now mostly having waterproof coating
-
Very strong
-
Light,stretchable
Pregunta 25
Pregunta
Saturated fats are healthier than unsaturated fats
Respuesta
- True
- False
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