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WorksheetsBonding and Balancing Equations Test Review
Total questions: 50
Worksheet time: 48mins
Name
Class
Date
1.
When an atom loses an electron, it becomes a:
a)
positive ion
b)
negative ion
c)
neutral ion
d)
neutral atom
2.
Elements in Group 1 lose one electron to form ions with a(n) _________________ charge.
a)
1+
b)
2+
c)
0
d)
1-
3.
What is the charge on an Aluminium ion?
a)
3
b)
+3
c)
+2
d)
+1
4.
How many valence electrons does hydrogen have?
a)
1
b)
2
c)
3
d)
4
5.
How many valence electrons does calcium have?
a)
2
b)
4
c)
6
d)
7
6.
A charged particle that has gained at least one electron is called a(n) _____.
a)
Anion
b)
Cation
c)
Anonion
d)
chemistry cat
7.
Nitrogen will ____ electrons when forming an ionic bond.
a)
gain 1
b)
lose 1
c)
gain 3
d)
lose 3
8.
Ionic bonds form between metals and ____.
a)
metalloids
b)
metals
c)
nonmetals
9.
What are charged particles that form when atoms gain or lose electrons?
a)
ions
b)
neutrons
c)
bonds
d)
particle atoms
10.
Why are ions charged particles?
a)
The number of electrons does not equal the number of protons.
b)
The number of protons does not equal the number of neutrons.
c)
The number of neutrons does not equal the number of electrons.
d)
The electric charges of the electrons and protons cancel each other out.
11.
When atoms gain electrons during chemical changes, what charge do they have?
a)
positive charge
b)
negative charge
c)
neutral charge
d)
electric charge
12.
For electrons to pull away from atoms, ____________________ is needed.
a)
negative ions
b)
charges
c)
electric charges
d)
energy
13.
In sodium chloride, sodium gives an electron to chlorine.
a)
True
b)
False
14.
Which two elements could form an ionic compound?
a)
#6 carbon and #8 oxygen
b)
#1 hydrogen and #7 nitrogen
c)
#3 lithium and #9 fluorine
d)
#5 boron and #10 neon
15.
Which of the following compounds is not an ionic compound?
a)
barium oxide
b)
lithium oxide
c)
carbon dixoide
d)
calcium chloride
16.
How many electrons does #15 phosphorus need to gain to be stable?
a)
one
b)
two
c)
three
d)
four
17.
When two atoms share electrons, a chemical bond is formed. This type of bond is called:
a)
covalent bond
b)
ionic bond
c)
crystal bond
d)
polyatomic bond
18.
What is a double bond?
a)
a bond between two atoms
b)
one pair of electrons shared between two atoms
c)
two pairs of electrons shared between two atoms
d)
James Bond's brother
19.
What region of the periodic table contains atoms that form covalent bonds?
a)
the left side
b)
the middle
c)
the right side
d)
top left
20.
What molecule is this?
a)
CO
b)
CO2
c)
C2O
d)
C2O2
21.
How many bonds does carbon have to create in order to satisfy the octet rule
a)
1
b)
2
c)
3
d)
4
22.
What two types of atoms make a covalent bond?
a)
2 Nonmetals
b)
1 Nonmetal and 1 Metal
c)
2 Metals
d)
2 Noble Gases
23.
How many are shared in a single bond?
a)
2 pairs
b)
4
c)
2
d)
1
24.
How many are shared in a double bond?
a)
2
b)
4 pairs
c)
6
d)
4
25.
How many electrons are shared in a triple bond?
a)
6
b)
3
c)
6 pairs
d)
5
26.
What is a reactant in a chemical equation?
a)
The input which reacts chemically to create product
b)
the output, or result of a chemical reaction
c)
a small molecule that makes up one part of a polymer
d)
compounds made of thousands of repeating smaller molecules
27.
What is a product in a chemical reaction?
a)
the output, or result of a chemical reaction
b)
occurs when the atoms and molecules of two or more substances rearrange to form new substances
c)
a small molecule that makes up one part of a polymer
d)
The input which reacts chemically to create product
28.
Fill in the blank:
The law of conservation of mass states that matter cannot be created nor __________________.
The law of conservation of mass states that matter cannot be created nor __________________.
a)
destroyed
b)
rearranged
c)
transferred
d)
changed
29.
Fill in the blank:
A __________________ chemical equation shows that the same number of atoms in the reactants are also in the product.
A __________________ chemical equation shows that the same number of atoms in the reactants are also in the product.
a)
balanced
b)
transferred
c)
rearranged
d)
beautiful
30.
In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25g. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?
a)
25g
b)
You can't tell with the given information.
c)
30g
d)
15g
31.
The following chemical reaction occurs:
2S + 3O2 -> 2SO3
How many atoms of oxygen are there in the reactant?
2S + 3O2 -> 2SO3
How many atoms of oxygen are there in the reactant?
a)
2 atoms of oxygen
b)
3 atoms of oxygen
c)
6 atoms of oxygen
d)
1 atom of oxygen
32.
The following chemical reaction occurs:
N2 + 3 H2 -> 2 NH3
How many atoms of hydrogen are there in the product?
N2 + 3 H2 -> 2 NH3
How many atoms of hydrogen are there in the product?
a)
3 atoms of hydrogen
b)
2 atoms of hydrogen
c)
6 atoms of hydrogen
d)
1 atom of hydrogen
33.
The following chemical equation occurs:
CH4 + 2O2 -> CO2 + 2H2O
Does this equation follow the law of conservation of mass? In other words, are there the same number of carbon, hydrogen, and oxygen atoms in the reactants and the products?
CH4 + 2O2 -> CO2 + 2H2O
Does this equation follow the law of conservation of mass? In other words, are there the same number of carbon, hydrogen, and oxygen atoms in the reactants and the products?
a)
Yes
b)
No
c)
You can't tell with the given information
34.
There are two reactants in a chemical equation, and one product. The mass of the product is 30g. The mass of the first reactant is 17g. What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?
a)
47g
b)
13g
c)
23g
d)
You cant tell with the given information
35.
Number placed in front of a chemical formula
a)
product
b)
coefficient
c)
reactant
d)
subscript
36.
Number written below & to the right of a chemical symbol
a)
subscript
b)
reactant
c)
product
d)
coefficient
37.
10 g of a solid chemical reacts with a 10 g of a liquid chemical, the reaction bubbles and changes the color of the liquid. The colored liquid weighs 13 g, what can be concluded?
a)
The gas produced from the bubbles weighed 5 g
b)
The bubbles were evidence of 7 g of matter being destroyed
c)
The gas produced weighed 7 g
d)
The gas produced weighed 13 g
38.
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
39.
Which is Chemical Equation is Balanced?
a)
CH₄+O₂------CO₂+2H₂O
b)
H₂+O₂-----2H₂O₄
c)
4Al+3O₂-----2Al₂O₃
40.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
41.
Is this equation balanced or unbalanced?
2Fe2O3 + 3C --> 4Fe + 3 CO2
2Fe2O3 + 3C --> 4Fe + 3 CO2
a)
balanced
b)
unbalanced
42.
Is this balanced?
2HgO → 2Hg + O2
2HgO → 2Hg + O2
a)
Yes
b)
No
43.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
44.
Which Chemical Equation is Balanced?
a)
CH₄+O₂------CO₂+2H₂O
b)
H₂+O₂-----2H₂O₄
c)
4Al+3O₂-----2Al₂O₃
45.
Ca + O2 --> CaO
What coefficient goes in front of CaO?
What coefficient goes in front of CaO?
a)
1
b)
2
c)
3
d)
4
46.
Cu2O + C --> Cu + CO2
What coefficient goes in front of Cu?
What coefficient goes in front of Cu?
a)
1
b)
2
c)
3
d)
4
47.
KNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?
What coefficients are needed to balance the reaction?
a)
2, 2, 1
b)
2, 3, 2
c)
1, 2, 2
d)
1, 3, 1
48.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
49.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
50.
Balance the following equation:
__N2 + __H2 --> __NH3
__N2 + __H2 --> __NH3
a)
N2 + 3H2 --> 2NH3
b)
2N2 + 3H2 --> NH3
c)
3N2 + 2H2 --> 2NH3
d)
N2 + H2 --> NH3
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