test-science

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what is a ion?
when an atom is negatively charged or positively charged
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what attracts and does not attract? (charges)
opposites attract e.g. + + =repel - - =repel + - =attract
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what type of charge can move?
electrons are the only charge that can move because they have more energy.
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what is the current?
the flowing electrons
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what is voltage?
the force moving the electrons around the circuit.
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what does an ammeater do?
an ammeter shows us what the speed of the current is. the current is measured n amps
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what is OHMS law?
OHMS law is the triangle with voltage at the top and current on the bottom left with resistance next to it.
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what is an electromagnet?
it is a bit of metal such as an iron nail and wrap wire round. the electric will make the metal magnetic.
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how can you make the magnet stronger?
by putting more coils around the bit of metal.
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what is a hydrocarbon?
a fuel made from only carbon and hydrogen atoms. such as methane.
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how can you increase the gas pressure in a space?
by burning or making the space smaller.
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when does displacement happen?
it happens when a oxidised element that is less reactive than a other element and the more reactive one steals the oxide from it.
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two ways you can prevent rusting?
physical barrier where you use paint. or using a sacrificial block to attract the oxygen.
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how do things rust?
things rust over a long period of time when iron is in contact with oxygen
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what speeds up the process of rusting?
water and salt
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what is a catalyst?
something that speed up a process.
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what is electrolysis used for?
to get element like sodium separated form an ore.
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how?
by using negative and positive charges the sodium will be attracted to one of the two and the rock it is in will be attracted to the other
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why?
sodium is very attractive meaning and reacts with things easily and the element above it are already reacted so you cannot use them.
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what is an ore?
a rock that contains enough metal to make it economical worthwhile to extract the elements apart.
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very reactive elements?
potassium, sodium, calcium and magnesium.
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not very reactive elements?
copper, silver and gold
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what are in the middle of reactivity?
carbon
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what is reduction?
it is when you use carbon to take away the oxygen
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name some natural elements? (you don't have to use electrolysis or reduction)
gold and silver
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when burning you react with???
oxygen
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potatoes are what?
the starch storage organs of a plant
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weeds are???
unwanted plants
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what is an electrolyte?
a liquid that contains ions so that electricity can go though it during electrolysis
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what is an anode?
a positivity charged electrode
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what is a cathode
a negativity charged electrode
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what is an electrolictic cell?
the devise used in electrolysis
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what is the battery connected to?
an electrode
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cathode =
reduction = gain of electrons
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anode =
oxidation = loss of electrons
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how does co2 get in plant and how does oxygen get out?
through the stomata
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what does chlorophyll attract?
the photons from the sun
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what is the chlorophyll kept in?
chloroplast
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what is electricity?
the movement of electrons
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what is an ionic substance?
when a non-metal reacts with a metal contains ions.
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what are the three magnetic metals?
nickel, iron and Colbert.
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what are watts?
the power of a magnet
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the best test for a magnet and why?
reputation because a magnet can attract non magnetic magnets but can not reple against it
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Other cards in this set

Card 2

Front

what attracts and does not attract? (charges)

Back

opposites attract e.g. + + =repel - - =repel + - =attract

Card 3

Front

what type of charge can move?

Back

Preview of the front of card 3

Card 4

Front

what is the current?

Back

Preview of the front of card 4

Card 5

Front

what is voltage?

Back

Preview of the front of card 5
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