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WorksheetsMatter - Chemical Reactions
Total questions: 20
Worksheet time: 40mins
Name
Class
Date
1.
In a nonpolar covalent bond, electrons are
a)
located in a mobile "sea" shared by many ions
b)
transferred from one atom to another
c)
shared equally by two atoms
d)
shared unequally by two atoms
2.
Which compound contains ionic bonds?
a)
NaBr
b)
HBr
c)
C6H12O6
d)
CO2
3.
Which substance contains a polar covalent bond?
a)
H2
b)
HCl
c)
Cl2
d)
KCl
4.
As a bond between a hydrogen atom and a sulfur atom is formed, electrons are
a)
shared to form an ionic bond
b)
shared to form a covalent bond
c)
transferred to form an ionic bond
d)
transferred to form a covalent bond
5.
What is the formula for potassium hydride?
a)
K3H
b)
K2H
c)
KH
d)
KH2
6.
What is the name of the following chemical formula? P2Cl5
a)
potassium chloride
b)
phosphorus (II) chloride
c)
phosphorus (V) chloride
d)
diphosphorus pentachloride
7.
How many oxygen atoms are present in the reactant in this chemical equation?
4Fe + 3O2 → 2 Fe2O3
4Fe + 3O2 → 2 Fe2O3
a)
2
b)
3
c)
4
d)
6
8.
Identify the correctly balanced equation:
a)
Fe + H2O → Fe3O4 + H2
b)
C+ H2 → CH4
c)
S8 + F2 → SF6
d)
N2 + 3H2 → 2NH3
9.
Which of the following BEST represents the law of conservation of mass?
a)
12 grams reactant X + 10 grams reactant Y --> 2 grams product Z
b)
4 grams reactant U + 3 grams reactant V --> 7 grams product W
c)
10 grams reactant Q + 9 grams reactant R --> 90 grams product S + 90 grams product T
d)
5 grams reactant E + 5 grams reactant F --> 20 grams product G + 5 grams product H
10.
Which procedure BEST represents the law of conservation of mass?
a)
Evaporating salt water leaves 5 grams of salt
b)
Burning 2 kilograms of wood leaves 0.4 kilograms of ash
c)
Using filter paper to separate 2 grams of solid from 10 grams of water
d)
Combining 2 grams of copper and 4 grams of sulfur to produce 6 grams of copper sulfate
11.
A balanced chemical equation reflects the idea that the mass of the products
a)
is greater than the mass of the reactants
b)
is less than the mass of the reactants
c)
equals the mass of the reactants
d)
is not related to the mass of the reactants
12.
How is this reaction classified?
CaO + H2O --> Ca(OH)2 + heat
CaO + H2O --> Ca(OH)2 + heat
a)
endothermic
b)
exothermic
c)
decomposition
d)
double replacement
13.
Which of the following chemical reactions is a decomposition reaction?
a)
BaCO3 --> BaO + CO2
b)
2Ca + O2--> 2CaO
c)
3 Br2+ 2FeI3--> 2FeBr3 + 3 I2
d)
MgCl2+ H2SO4--> MgSO4+ 2HCl
14.
Which of the following represents a double displacement reaction?
a)
ABC --> AB + C
b)
A + B --> AB
c)
AB + CD --> AC + BD
d)
A + BC --> B + AC
15.
A student makes some yogurt. The yogurt tastes sour. The yogurt is most likely in which pH range?
a)
between 4 and 6
b)
between 7 and 8
c)
between 9 and 11
d)
between 11 and 13
16.
A solution of a base differs from a solution of an acid in that the solution of a base _______________________.
a)
is able to conduct electricity
b)
is able to cause an indicator color change
c)
has a greater H3O+ concentration
d)
has a greater OH- concentration
17.
The acidic property of an aqueous solution is due to an excess of _________________________.
a)
H2
b)
H+
c)
H2O
d)
OH-
18.
Which relationship is present in a solution that has a pH of 7?
a)
concentration of H= = concentration of OH-
b)
concentration of H- > concentration of OH-
c)
concentration of H- < concentration of OH-
d)
concentration of H- + concentration of OH-
19.
Given the neutralization reaction:
H2SO4 + 2KOH --> K2SO4 + 2 H2O
Which compound is a salt?
H2SO4 + 2KOH --> K2SO4 + 2 H2O
Which compound is a salt?
a)
KOH
b)
H2SO4
c)
K2SO4
d)
H2O
20.
Which species does a base produce in an aqueous solution?
a)
hydrogen
ions
b)
hydroxide
ions
c)
sodium
ions
d)
chloride
ions
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