WorksheetsDescribing Chemical Reaction 1 - Post
Total questions: 9
Worksheet time: 5mins
Name
Class
Date
1.
Is ths a chemical or a physical change?
a)
Chemical change
b)
Physical change
2.
A substance that speeds up chemical reactions
a)
activation energy
b)
catalyst
c)
precipitate
d)
chemical reaction
3.
The total mass of the reactants must equal the total mass of products. Matter is never created or destroyed
a)
Conservation of Mass
b)
Pascal's Principle
c)
catalyst
d)
inhibitor
4.
Is burning a campfire a chemical or physical change?
a)
Chemical
b)
Physical
5.
In this model, the reactants are...
a)
2H2O
b)
H2O2
c)
2H2
d)
O2
6.
In this model, the PRODUCTS are
a)
2KI and 2KNO3
b)
2KI and Pb(NO3)2
c)
PbI2 and 2KI
d)
PbI2 and 2KNO3
7.
Why is ice freezing ONLY a physical change?
a)
The ice is colder than water.
b)
It can stay cold when you put it in the freezer.
c)
The molecules of water do NOT change. They only slow down and vibrate in position.
d)
Its physical appearance does NOT change.
8.
Which of the following statements is true about what happens in all chemical reactions?
a)
The ways in which atoms are joined together is not changed.
b)
New atoms are formed as products.
c)
The final substances are called reactants.
d)
Bonds between atoms are broken and new bonds are formed.
9.
The symbol in the image below stands for
a)
aqueous
b)
aqualine
c)
aquaman
d)
aqua
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