Science (Unit 1)(Chemical Reaction)

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Melting
a solid to a liquid
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Freezing
a liquid changing to a solid
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evaporation
a liquid changing to a gas
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Condensation
a gas changing to a liquid
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Sublimation
a solid changing to a gas
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Physical Change
a reversible reaction
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Chemical Change
an irriversible reaction
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Reactants
The substances that are reacted together in a chemical reaction and are written before the arrow in a word equation
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Products
The substances that are produced in a chemical reaction and are written after the arrow in a word equation
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Flammable
burns easily
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3 physical changes
melting chocolate, melting wax, melting butter
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steam
the gas version of water
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boiling point
100 degrees C
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melting point or freezing point
0 degrees C
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To change from one point to another you must...
heat or cool
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Where in the water cycle does the water condense?
The sky
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Where in the water cycle does water freeze?
The sky or mountains
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Where in the water cycle does the water melt?
on the ground
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if it rained today where would most of the rain go?
It would evapourate
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How are insoluble particles removed?
Filtration
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how are germs removed?
chlorination
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what does '------>' mean?
changes into
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What does zinc oxide look like before heating?
White solid
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What does zinc oxide look like after heating?
Yellow solid
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is zinc oxide reversible or irriversible after heating?
Reversible
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What does copper sufate look like before heating?
Blue salt
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What does copper sulfate look like after heating?
white solid
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is copper sulfate reverisble or irriversible after heating?
Irreversible
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What does magnesium ribbon look like before heating?
Grey metal solid
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What does magnesium ribbon look like after heating?
White ash
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Is magnesium ribbon reversible or irrversible after heating?
Irreversible
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What does copper carbonate look like before heating?
green solid
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What does copper carbonate look like after heating?
Black solid
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is copper carbonate reversible or irreversible after heating?
Irreversible
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What do Iodine crystals look like before heating?
black solid
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what do iodine crystals look like after heating?
purple gas
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are iodine crystals reversible or irreversible?
reversible
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what does Ammonium dichromate look like before heating?
orange solid
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what does Ammonium dichromate look like after heating?
green solid
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Is ammonium dichromate reversible or irreversible after heating?
Irreversible
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4 characteristics for a physical change
No new substance, reversible, no change in mass, small amount of energy or heat is required
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4 characteristics for a chemical change
a new substance, irreversible, chnage in mass, large amount of energy taken in or given out
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What is the word eqaution for burning magnesium in air
magnesium + oxygen ---> magnesium oxide
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3 fossil fuels
coal, gas and oil
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what is the word equation for burning?
fuel + oxygen ---> carbon dioxide + water + energy
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what is in the fire triangle?
Fuel, oxygen, heat
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what would happen if 1 thing from the fire triangle is remvoed from the fire?
The fire would go out
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What percentage of the air is Nitrogen?
78%
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What percentage of the air is Oxygen?
21%
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What percentage of the air is Carbon Dioxide?
0.03%
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What percentage of the air is Water Vapour?
varies
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What percentage of the air is Helium, Neon and other noble gases
0.90
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Other cards in this set

Card 2

Front

a liquid changing to a solid

Back

Freezing

Card 3

Front

a liquid changing to a gas

Back

Preview of the back of card 3

Card 4

Front

a gas changing to a liquid

Back

Preview of the back of card 4

Card 5

Front

a solid changing to a gas

Back

Preview of the back of card 5
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