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WorksheetsCompounds
Total questions: 20
Worksheet time: 5mins
The starting materials in a chemical reaction
A substance that is formed as the result of a chemical reaction
Which of the following is an example of a chemical change?
water freezes to form ice
sugar dissolves in water
metals react with oxygen forming metal oxides
a piece of metal expands when it is heated
a gas burns in the air
When soluble substances react together they form an insoluble solid
A chemical change is different than a physical change because in a chemical change
chemicals are used
particles do not physically touch
a new substance is formed and in a physical no new substance is formed
the change can be seen but in a physical change it cannot
Which of the following 2 are chemical reactions?
sugar dissolving in water
water turning into steam
burning wood
mixing baking soda and vinegar
tearing paper
Atoms are not made or destroyed in a chemical reaction
True
False
•A compound can only be separated into elements using chemical reaction. This is difficult to do.
True
False
How to identify a chemical reaction? (multiple choice)
Change in shape
change in colour
change in smell
change in length
When you add vinegar and baking soda it produces :
oxygen gas
hydrogen gas
carbon dioxide gas
Testing for hydrogen gas, the lighted wooden splint :
blows out
produced a pop sound
burns more fiercely
Testing for oxygen gas, the wooden splint
melts
burns more fiercely
blows out
It does NOT dissolve in water
soluble
insoluble
The key word "REACT" meaning_____
When substances are mixed together and change chemically to form a new substance
When substances are mixed together but do not change chemically to form a new substance
none of the above
Both of the above
The word "SOLUBLE" meaning
Something which dissolve in water/liquid
Something which do not dissolve in water/liquid
None
both
The word "INSOLUBLE" meaning ________
Something which dissolve in water/liquid
Something which cannot dissolve in water/liquid
none
both
A mixture that looks clear contains _________ substance.
soluble
insoluble
A dissolved substance like salt can be seen in a mixture.
True
False
"FLOUR" ________ in water.
Soluble
Insoluble
