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Worksheetslaw of mass conservation
Total questions: 14
Worksheet time: 14mins
Name
Class
Date
1.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
2.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same number of atoms
3.
Which of these is not a chemical reaction?
a)
Burning of wood
b)
Milk going bad
c)
Mixing vinegar and baking soda
d)
Melting of ice
4.
The number of water molecules in 3H2O is
a)
6
b)
2
c)
3
d)
5
5.
If reaction starts with 20g of reactants it should produce
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
6.
In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?
a)
4g
b)
5g
c)
9g
d)
14g
7.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
8.
Which are the reactants in the following reaction?
2Mg + O2 ---> 2MgO
2Mg + O2 ---> 2MgO
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
9.
In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?
a)
17g
b)
2g
c)
7g
d)
None of the above
10.
How many oxygen atoms are in the products for the chemical reaction below?
4Fe + 3O2 → 2Fe2O3
a)
2
b)
3
c)
5
d)
6
11.
What do we call the chemicals that result from a chemical reaction?
a)
reactants
b)
products
c)
subscripts
d)
coefficients
12.
When sodium and chlorine combine to form sodium chloride, sodium chloride is the:
a)
Originator
b)
Reactant
c)
Product
d)
Produce
13.
What is this emotion?
a)
Cool
b)
Cold
c)
Hot
d)
In Love
14.
which cartoon character is this?
a)
ben ten
b)
oggy
c)
tom and jerry
d)
jake
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