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Per 2 Chapter 7 Prep-Test

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
A chemical reaction has NOT occurred if the products have
a.
the same mass as the reactants.
b.
less total bond energy than the reactants.
c.
more total bond energy than the reactants.
d.
the same chemical properties as the reactants.
 

 2. 
Which observation does NOT indicate that a chemical reaction has occurred?
a.
formation of a precipitate
c.
evolution of heat and light
b.
production of a gas
d.
change in total mass of substances
 

 3. 
A solid produced by a chemical reaction in solution that separates from the solution is called
a.
a precipitate.
c.
a molecule.
b.
a reactant.
d.
the mass of the product.
 

 4. 
After the correct formula for a reactant in an equation has been written, the
a.
subscripts are adjusted to balance the equation.
b.
formula should not be changed.
c.
same formula must appear as the product.
d.
symbols in the formula must not appear on the product side of the equation.
 

 5. 
In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is
a.
H.
c.
H2.
b.
2H.
d.
OH.
 

 6. 
What is the small whole number that appears in front of a formula in a chemical equation?
a.
a subscript
c.
a ratio
b.
a superscript
d.
a coefficient
 

 7. 
To balance a chemical equation, it may be necessary to adjust the
a.
coefficients.
c.
formulas of the products.
b.
subscripts.
d.
number of products.
 

 8. 
A chemical equation is balanced when the
a.
coefficients of the reactants equal the coefficients of the products.
b.
same number of each kind of atom appears in the reactants and in the products.
c.
products and reactants are the same chemicals.
d.
subscripts of the reactants equal the subscripts of the products.
 

 9. 
How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water?
a.
oxygen
c.
O2
b.
O
d.
O3
 

 10. 
Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen?
a.
Carbon plus oxygen yields carbon dioxide.
b.
C + O2 ® CO2
c.
CO2 ® C + O2
d.
2C + O ® CO2
 

 11. 
In an equation, the symbol for a substance in water solution is followed by
a.
(1).
c.
(aq).
b.
(g).
d.
(s).
 

 12. 
When the equation Fe3O4 + Al ® Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?
a.
3
c.
6
b.
4
d.
9
 

 13. 
Which coefficients correctly balance the formula equation NH4NO2(s)® N2(g) + H2O(l)?
a.
1, 2, 2
c.
2, 1, 1
b.
1, 1, 2
d.
2, 2, 2
 

 14. 
Which coefficients correctly balance the formula equation CaO + H2O ® Ca(OH)2?
a.
2, 1, 2
c.
1, 2, 1
b.
1, 2, 3
d.
1, 1, 1
 

 15. 
After the first steps in writing an equation, the equation is balanced by
a.
adjusting subscripts to the formula(s).
b.
adjusting coefficients to the smallest whole-number ratio.
c.
changing the products formed.
d.
making the number of reactants equal to the number of products.
 

 16. 
The complete balanced equation for the reaction between zinc hydroxide and acetic acid is
a.
ZnOH + CH3COOH ® ZnCH3COO + H2O.
b.
Zn(OH)2 + CH3COOH ® Zn + 2CO2 +3H2O.
c.
Zn(OH)2 + 2CH3COOH ® Zn(CH3COO)2 + 2H2O.
d.
Zn(OH)2 + 2CH3COOH ® Zn(CH3COO)2 + H2 + O2.
 

 17. 
What is the balanced equation for the combustion of sulfur?
a.
S(s) + O2(g) ® SO(g)
c.
2S(s) + 3O2(g) ® SO3(s)
b.
S(s) + O2(g) ® SO2(g)
d.
S(s) + 2O2(g) ® SO42–(aq)
 

 18. 
Chemical reactions ____.
a.
occur only in living organisms
c.
only occur outside living organisms
b.
create and destroy atoms
d.
produce new substances
 

 19. 
Chemical equations ____.
a.
describe chemical reactions
b.
show how to write chemical formulas
c.
give directions for naming chemical compounds
d.
describe only biological changes
 

 20. 
Symbols used in equations, together with the explanations of the symbols, are shown below. Which set is correct?
a.
(g), grams
c.
(aq), dissolved in water
b.
(l), liters
d.
(s), solid product
 

 21. 
In the chemical equation Hmc021-1.jpgOmc021-2.jpg(aq) ® Hmc021-3.jpgO(l) mc021-4.jpg Omc021-5.jpg(g), the mc021-6.jpg is a ____.
a.
catalyst
c.
product
b.
solid
d.
reactant
 

 22. 
Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?
a.
P(s) mc022-1.jpg Omc022-2.jpg(g) ® POmc022-3.jpg(g)
c.
P(s) mc022-7.jpg O2(g) ® Pmc022-8.jpgOmc022-9.jpg(s)
b.
P(s) mc022-4.jpg O(g) ® Pmc022-5.jpgOmc022-6.jpg(g)
d.
Pmc022-10.jpgOmc022-11.jpg(s) ® Pmc022-12.jpg(s) mc022-13.jpg Omc022-14.jpg(g)
 

 23. 
If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for fluorine be?
nitrogen trifluoride mc023-1.jpg nitrogen mc023-2.jpg fluorine
a.
6Fmc023-3.jpg
c.
6F
b.
Fmc023-4.jpg
d.
3Fmc023-5.jpg
 

 24. 
What are the coefficients that will balance the skeleton equation below?
AlClmc024-1.jpg + NaOH mc024-2.jpg Al(OH)mc024-3.jpg mc024-4.jpg NaCl
a.
1, 3, 1, 3
c.
1, 1, 1, 3
b.
3, 1, 3, 1
d.
1, 3, 3, 1
 

 25. 
What are the coefficients that will balance the skeleton equation below?
Nmc025-1.jpg + Hmc025-2.jpg mc025-3.jpg NHmc025-4.jpg
a.
1, 1, 2
c.
3, 1, 2
b.
1, 3, 3
d.
1, 3, 2
 

 26. 
When the equation Fe mc026-1.jpg Clmc026-2.jpg mc026-3.jpg FeClmc026-4.jpg is balanced, what is the coefficient for Clmc026-5.jpg?
a.
1
c.
3
b.
2
d.
4
 

 27. 
When the following equation is balanced, what is the coefficient for HCl?
Mg(s) mc027-1.jpg HCl(aq) mc027-2.jpg MgClmc027-3.jpg(aq) mc027-4.jpg Hmc027-5.jpg(g)
a.
6
c.
1
b.
3
d.
2
 

 28. 
Which of the following statements is NOT true about what happens in all chemical reactions?
a.
The ways in which atoms are joined together are changed.
b.
New atoms are formed as products.
c.
The starting substances are called reactants.
d.
The bonds of the reactants are broken and new bonds of the products are formed.
 

 29. 
When the equation KClOmc029-1.jpg(s) mc029-2.jpg KCl(s) + Omc029-3.jpg(g) is balanced, the coefficient of KClO3 is ____.
a.
1
c.
3
b.
2
d.
4
 

 30. 
In every balanced chemical equation, each side of the equation has the same number of ____.
a.
atoms of each element
c.
moles
b.
molecules
d.
coefficients
 

 31. 
What are the missing coefficients for the skeleton equation below?
Cr(s) mc031-1.jpg Fe(NOmc031-2.jpg)mc031-3.jpg(aq) mc031-4.jpg Fe(s) mc031-5.jpg Cr(NOmc031-6.jpg)mc031-7.jpg(aq)
a.
4, 6, 6, 2
c.
2, 3, 3, 2
b.
2, 3, 2, 3
d.
1, 3, 3, 1
 

 32. 
What are the missing coefficients for the skeleton equation below?
Almc032-1.jpg(SOmc032-2.jpg)mc032-3.jpg(aq) mc032-4.jpg KOH(aq) ® Al(OH)mc032-5.jpg(aq) mc032-6.jpg Kmc032-7.jpgSOmc032-8.jpg(aq)
a.
1, 3, 2, 3
c.
4, 6, 2, 3
b.
2, 12, 4, 6
d.
1, 6, 2, 3
 

 33. 
When potassium hydroxide and barium chloride react, potassium chloride and barium hydroxide are formed. The balanced equation for this reaction is ____.
a.
KH mc033-1.jpg BaCl mc033-2.jpg KCl mc033-3.jpg BaH
c.
2KOH mc033-7.jpg BaClmc033-8.jpg mc033-9.jpg 2KCl mc033-10.jpg Ba(OH)mc033-11.jpg
b.
KOH mc033-4.jpg BaCl mc033-5.jpg KCl mc033-6.jpg BaOH
d.
KOH mc033-12.jpg BaClmc033-13.jpg mc033-14.jpg KClmc033-15.jpg mc033-16.jpg BaOH
 

 34. 
The product of a combination reaction is Ba(OH)mc034-1.jpg. If one of the reactants is Hmc034-2.jpgO, what is the other reactant?
a.
Bamc034-3.jpgO
c.
BaH
b.
BaO
d.
BaOmc034-4.jpg
 

 35. 
For the formula equation 2Mg + O2 ® 2MgO, the word equation would begin
a.
Manganese plus oxygen . . .
c.
Magnesium plus oxygen . . .
b.
Molybdenum plus oxygen . . .
d.
Heat plus oxygen . . .
 

Matching
 
 
Match each item with the correct statement below.
a.
product
d.
balanced equation
b.
reactant
e.
skeleton equation
c.
chemical equation
 

 36. 

 a chemical equation that does not indicate relative amounts of reactants and products
 

 37. 

 a new substance formed in a chemical reaction
 

 38. 

 a starting substance in a chemical reaction
 

 39. 

 a concise representation of a chemical reaction
 

 40. 

 an equation in which each side has the same number of atoms of each element
 



 
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