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WorksheetsChemistry Review
Total questions: 40
Worksheet time: 42mins
Name
Class
Date
1.
A subscript is the small number below a(n) ________ that tells the number of _______ of that element.
a)
element symbol; atoms
b)
atom; element symbol
c)
subscript; protons
d)
compound; elements
2.
If there is no subscript, there is ______ atom(s) of that element.
a)
0
b)
2
c)
1
d)
no
3.
How many elements are present in the compound Mg2As3COHNi2?
a)
10
b)
7
c)
6
d)
9
4.
Which of these is NOT a compound?
a)
H2Cr
b)
2Cr3
c)
OH
d)
PNi
5.
Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)
three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
6.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
d)
2
7.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
d)
6
8.
2H2O → 2H2 + O2; What are the products?
a)
→
b)
2H2O
c)
2H2 + O2
d)
O2
9.
2H2O → 2H2 + O2; What are the reactants?
a)
→
b)
2H2O
c)
2H2 +O2
d)
2H2
10.
Which equation obeys the law of conservation of mass?
a)
H2 + O2 → H20
b)
C + 2H2 → CH4
c)
2Fe2O3 → 2O2 + 4Fe
d)
K(OH)3 + 2Na → 3KH + Na2O
11.
The law of conservation of mass states that
a)
chemical reactions change matter.
b)
in chemical reactions, the identity of reactants and products is conserved.
c)
atoms are neither created nor destroyed in chemical reactions.
d)
a chemical formula must be balanced.
12.
What is the left part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
13.
What is the right part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
14.
At the end of a chemical reaction, how does the total mass of the reactants compare to the total mass of the products?
a)
The product is double the mass
b)
The product is half the mass of the reactants
c)
The mass stays the same
d)
The mass changes depending on the reaction
15.
Coefficients tell us how many ________ there are of an element in a compound.
a)
Elements
b)
Atoms
c)
Molecules
d)
Reactants
16.
How many molecules are in this chemical formula? 2Al2O3
a)
4 Molecules
b)
6 Molecules
c)
2 Molecules
d)
5 Molecules
17.
Is this balanced?
2HgO → 2Hg + O2
2HgO → 2Hg + O2
a)
Yes
b)
No
18.
One cup of water is left outside for two days when it was checked there was only half a cup left. What happened?
a)
evaporation; chemical change
b)
condensation; physical change
c)
evaporation; physical change
d)
condensation; chemical change
19.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
20.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
21.
Is bleaching your hair with peroxide a physical or chemical change?
a)
physical
b)
chemical
22.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
23.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
soured milk
24.
Kim puts an ice cube in a beaker and it melts. This is a good example of:
a)
a physical change.
b)
a chemical change.
c)
an experiment.
d)
an analysis.
25.
Salt dissolves in water is an example of a
a)
physical change
b)
chemical change
26.
A piece of copper being cut in half is an example of a
a)
physical change
b)
chemical change
27.
A sugar cube being ground up is an example of a
a)
physical change
b)
chemical change
28.
Fireworks exploding is an example of a
a)
physical change
b)
chemical change
29.
Iron pipes rusting is an example of a
a)
physical change
b)
chemical change
30.
A tire inflated with air is an example of a
a)
physical change
b)
chemical change
31.
How many atoms of oxygen are in Al(OH)3?
a)
1
b)
3
c)
7
d)
5
32.
How many total atoms are in C2H6O?
a)
2
b)
6
c)
8
d)
9
33.
Which compound contains three times as many hydrogen atoms as carbon atoms?
a)
H3CO4
b)
H3ClO2
c)
C6H12O2
d)
(CO)3
34.
A chemical reaction will always produce
a)
bubbles/gas
b)
a new substance
c)
an odor
d)
a precipitate
35.
A pan of boiling water that produces steam is an example of
a)
a chemical change
b)
a chemical reaction
c)
a physical change
d)
condensation
36.
When you pour oil into vinegar to make salad dressing, the oil sits on top of the vinegar. This is an example of a
a)
chemical change
b)
physical change
37.
Calculate the missing mass:
2H2 + O2 → 2H2O
5 g + 12 g→ ? g
2H2 + O2 → 2H2O
5 g + 12 g→ ? g
a)
7 g
b)
5 g
c)
12 g
d)
17 g
38.
Calculate the missing mass:
2H2O → 2H2 + O2
? mL → 3 mL + 11 mL
2H2O → 2H2 + O2
? mL → 3 mL + 11 mL
a)
3 mL
b)
11 mL
c)
14 mL
d)
8 mL
39.
How would you calculate the average speed of the graph?
(s = d/t)
(s = d/t)
a)
8/45
b)
45/8
c)
45⋅8
d)
8+45
40.
Geoff runs across the field at a rate of 6 m/s2. When he tackles another player, he exerts a force of 540 N. What is his mass?
a)
90 kg
b)
3,240 kg
c)
546 kg
d)
534 kg
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