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WorksheetsConservation of mass Exit
Total questions: 14
Worksheet time: 13mins
Name
Class
Date
1.
A 500-gram block of solid cheese is melted in a pot. Which is most likely the mass of the cheese after it is melted?
a)
500 grams, because the cheese does not gain or lose mass just because it was melted
b)
499 grams, because some of the cheese evaporates as it melts
c)
502 grams, because the cheese absorbs heat as it melts
2.
A 55-gram egg is placed in a pot. After the egg is boiled, which is most likely the mass of the egg?
a)
50
b)
55
3.
In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B have?
a)
4g
b)
5g
c)
9g
d)
14g
4.
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
5.
What do we call the chemicals that result from a chemical reaction?
a)
reactants
b)
products
c)
subscripts
d)
coefficients
6.
The Law of Conservation of Mass says that matter can neither be __________ or __________.
a)
created; destroyed
b)
recycled; renewed
c)
subtracted; added
d)
joined; separated
7.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
8.
Is this equation balanced or unbalanced?
H2 + O2 --> H2O
H2 + O2 --> H2O
a)
balanced
b)
unbalanced
9.
How many Hydrogen atoms are in 4H2O?
a)
6
b)
8
c)
2
d)
4
10.
Number written below & to the right of a chemical symbol
a)
subscript
b)
reactant
c)
product
d)
coefficient
11.
Number placed in front of a chemical formula
a)
product
b)
coefficient
c)
reactant
d)
subscript
12.
How many oxygen atoms are in the products for the chemical reaction below?
4Fe + 3O2 → 2Fe2O3
a)
2
b)
3
c)
5
d)
6
13.
What is the total number of atoms in the chemical formula 2H2SO4?
a)
8
b)
10
c)
12
d)
14
14.
2Na + Cl2 → 2NaCl
How many Sodiums are there in the chemical formula.
a)
2
b)
4
c)
1
d)
6
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