science revision

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who created the periodic table?
Dmitri Mendeleev
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how do we know a chemical reaction has taken place?
change size, change colour or if it produces bubbles
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complete the word equasion: iron + oxygen -> .................
iron oxide
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what does a wod equasion explain?
a word equasion describes a chemical reaction using words
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for a certian area will a big force give a high or a low pressure?
a big force wil give high pressure
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which two of the following metals are magnetic: aluminium, copper, nickel, wood or iron
nickel and iron
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why does an electromagnet need a core?
because it makes it a magnetic material
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what is the earths core made of?
iron
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how is the Earth's magnetic field produced?
by an electric currernt in the core
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what is a cosmic ray?
high energy paricles
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how can cosmic rays affect your health?
because of the strong force
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what is the needle of a compass made of?
magnetic materials
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where is bacteria found?
in air, soil, water, plants ad animals
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what does engolfing mean?
when bacteria is eaten and then bascteria changes the white blood cells into puss
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what does the heart pump blood around?
Vains and Arteries
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give a definition of a temperature
a temperature measures how hot or cold something is
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what object do we use to measure temperature?
a thermometer
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how fast do particles in a solid move?
particles in a solid dont move
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what is convection?
convection is when something floats because there are less dense particles than the air
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what happens to the density of water as you heat it?
the density is less dense when heated because the particles are expanding
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how does a heater use convection?
it pumps out walm air by heating cold air particles in the room
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how does sweating cool us down?
by removing heat from our body to the envirolment
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Other cards in this set

Card 2

Front

how do we know a chemical reaction has taken place?

Back

change size, change colour or if it produces bubbles

Card 3

Front

complete the word equasion: iron + oxygen -> .................

Back

Preview of the front of card 3

Card 4

Front

what does a wod equasion explain?

Back

Preview of the front of card 4

Card 5

Front

for a certian area will a big force give a high or a low pressure?

Back

Preview of the front of card 5
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