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Transcript 
boiling bubbles colour compound condensation
element equation gases heat products reactants
reaction reversed word
1. Hydrogen and carbon dioxide are __________.
If they are formed in a reaction you will see
__________. This can be a sign that a chemical
__________ has happened.
2. Other signs of a chemical reaction might be an
increase in temperature if _____ is released or a
change in ________.
3. Physical changes like _________ do not make new
materials and are easily _________ eg, by cooling
which causes ___________.
4. The substances you start with are called
_________, and after the chemical change what is
formed are called the __________.
5. Zinc consists of only one type of atom so is called an
___________.
6. Carbon dioxide is made up of combining the different
atoms carbon and oxygen, and is known as a
____________.
7. A shorthand way of representing a chemical change
is to use a _____ _____________.
Name _____________ Form ___
What are reactions?
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ANTACID
CARBONATE
CHARACTERISTIC
EXOTHERMIC
FLAMMABLE
HYDROGEN
INDIGESTION
METAL
NEUTRALISATION
PRODUCT
REACTANT
REACTION
REACTIVE
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What are reactions? Keyword crossword
1
Across
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3
6.
7.
9.
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10.
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A change which means the products can't be returned back
to the reactants.
Acid + _______ --> salt + hydrogen
Acid + alkali --> ______ + water
The ________ of gas given off in a chemical reaction can be
measured using a measuring cylinder.
How you can tell that a gas is being given off.
Something which might change during a chemical reaction.
This might change during a chemical reaction.
A gas that can be identified by bubbling it through
limewater
An everyday household acid
Down
1.
14
15
16
Created with EclipseCrossword — www.eclipsecrossword.com
A gas that can be identified by the squeaky pop sound given
when a lit splint is put into the tube.
2. Taking an antacid for acid indigestion is an example of this
type of reaction.
4. Something which can be burned.
5. pH 14 shows a solution is __________
8. Acid + _________ --> salt + carbon dioxide + water
11. A reaction can be described using a word __________.
12. A type of change like melting.
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