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9.4& 9.6 Chemistry worksheet
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9) Which of the following should be kept as a control variable?
 
Volume of water in the container
 
Temperature change
 
Type of fuel
 
Amount of heat released
10) Why is it important to keep control variables the same?
 
To ensure a fair test
 
To increase the temperature
 
To change the results
 
To make the experiment more fun
7) In an investigation comparing fuels, what is the independent variable?
 
The type of fuel used
 
The amount of heat released
 
The temperature change of water
 
The size of the container
6) Which is the best scientific question for investigating fuels?
 
Which fuel releases the most heat energy when burned?
 
Which fuel is the best?
 
Why are fuels important?
 
Which fuel looks nicer?
5) Which process releases heat energy to the surroundings?
 
Freezing water
 
Cooking an egg
 
Boiling water
 
Melting wax
4) After reacting hydrochloric acid with sodium hydroxide, the temperature has increased from 21ËšC to 52ËšC. This reaction is
 
Exothermic
 
Endothermic
 
Athermic
 
isothermic
3) A grade 7 student wants to know if the reaction of hydrochloric acid and sodium hydroxide solution is exothermic or endothermic. He did an experiment for this reaction. Give the name of this reaction:
 
Neutralization
 
Dissolving
 
Burning
 
Combustion
2) Which of the following is an example of an endothermic reaction?
 
Ice melting into water
 
Explosion of fireworks
 
A candle flame giving off heat
 
Burning wood
1) Which statement best describes an exothermic reaction?
 
A reaction that releases heat to its surroundings
 
A reaction that absorbs heat from its surroundings
 
A reaction that does not involve energy
 
A reaction that only happens in cold conditions
True& false Some metals react with oxygen to make oxides.
True
True& false Magnesium is more reactive than Sodium
False
sodium peroxide symbol
Na2O2
Word chemical equation Magnesium reacts with oxygen
magnesium + oxygen-> magnesium oxide
The flare includes .........................., which makes a red flame.
strontium nitrate
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