Science

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What are the 4 seperation techniques to seperate mixtures?
Filteration, evaporation, filtering, chromotography
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What is the 4 step method to seperate a mixture of solid from liquid?
Grinding, Dissolving, Filtering, Evaporating
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What are the 2 other uses of chromotograhy other than its use of seperating ink dyes?
Identifying blood samples and investigating chlorophyll
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What does simple distillation do?
It seperates pure water from its ink.
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What does fractional distillation seperate?
It seperates mixed liquids.
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What is a solute and give an example of one?
The component of the solution which gets dissolved in a larger component e.g. sugar.
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What is a solvent?
The solution in which the solute dissolves e.g. water.
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What is an ecosysystem?
All living thing in one area plus their environment.
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What do food chains show?
What is eaten by what.
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What is a foodweb?
In a food web, lots of animals and plants are linked together in multiple ways.
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In a food web, if the number of otters increased, what would happen to the water beetles?
They would decrease as there would be more pike to it them.
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How is a camel adapted to its environment?
It has long eye lashes so it protects its eyes from dust and also it has humps on its back to store food and water so it can go long distances in the desert without it.
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Name some renewable and non-renewable energy sources?
Renewable- solar, wind, tidal, hydroelectric, geothermal, Biomass and wood. Non-renewable energy souces: oil, gas, coal, nucleur.
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Give an advantage of using fossil fuels?
They produce cheaper electricity than it from renewable sources, alos it is available all the time and they do not depend upon the weather.
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Give an disadvantage of using fossil fuels?
Fossil fuels produce greenhouse gases which contribute to climate change
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What does work mean?
The amount of energy transferred to move an object over a distance.
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What is work measured in?
Joules
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What is the work triangle?
Work = distance / time
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Give 2/3 examples of gears, pulleys and levers
Gears: roundabout, electric drill, a clock with hands. Pulleys: flag pole, rowing machine, garage door, lift. Levers: rowing machine and bicylcle brakes.
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What is power in relation to energy?
Power is the rating of watts of something
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What is a power rating?
The power rating of equipment is defined as the highest power input allowed to flow through particular equipment, commonly known as electric power.
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What does watt mean?
Equivalent to one joule per second. corresponding to the rate of consumption of energy in an electrical circuit where the potential difference in one volt and the current of one amphere.
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How many watts is a kilowatt equal to?
1 kilowatt= 1000 watts.
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What is the definition of kilowatt hour?
A measure of electrical energy equivalent to a power consumption of 1000 watts for one hour.
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What does a more reactive metal do to a less reactive metal?
It displaces it from its compound.
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Magnesium + iron nitrate - magnesium nitrate + _____.
Iron.
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Magnesium + _________ - magnesium + sulphate + zinc.
Zinc sulphate.
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________ + copper sulphate - magnesium sulphate + copper.
Magnesium.
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Iron + copper nitrate - ________________.
Iron nitrate + copper.
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What is a polymer?
A substance with very long molecules which consist of identical groups of atoms repeated many times.
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What are the 2 different types of polymers?
Natural and synthetic.
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Give 3 examples of natural polymers.
Wool, cotton, rubber.
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What are synthetic polymers made from?
Chemical reactions.
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Ethene- ______ Polythene- ______.
Ethene- monomer Polthene- polymer.
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State 3 causes why the population of a species changes ( increases/decreases)?
Increase- more habitats, laws restricting killing them, birthrate. Decrease- Animals being killed and climate change and global warming.
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What is an electormagnet?
A soft metal core made into a magnet by the passage of electric current through a coil surrounding it.
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Other cards in this set

Card 2

Front

What is the 4 step method to seperate a mixture of solid from liquid?

Back

Grinding, Dissolving, Filtering, Evaporating

Card 3

Front

What are the 2 other uses of chromotograhy other than its use of seperating ink dyes?

Back

Preview of the front of card 3

Card 4

Front

What does simple distillation do?

Back

Preview of the front of card 4

Card 5

Front

What does fractional distillation seperate?

Back

Preview of the front of card 5
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