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Period 2 Chemistry - Chapters 7 & 8 Prep-Test

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 
 
General Solubility Guidelines     
1. Most sodium, potassium, and ammonium compounds are soluble in water.     
2. Most nitrates, acetates, and chlorates are soluble.     
3. Most chlorides are soluble, except those of silver, mercury(I), and lead. Lead(II) chloride is soluble in hot water.     
4. Most sulfates are soluble, except those of barium, strontium, and lead.     
5. Most carbonates, phosphates, and silicates are insoluble, except those of sodium, potassium, and ammonium.     
6. Most sulfides are insoluble, except those of calcium, strontium, sodium, potassium, and ammonium.     
 

 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. 
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
 

 6. 
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.
 

 7. 
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
 

 8. 
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
 

 9. 
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.
 

 10. 
What is the balanced equation for the combination of sulfur with oxygen to produce sulfur dioxide?
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)
 

 11. 
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), soluble
 

 12. 
In the chemical equation Hmc012-1.jpgOmc012-2.jpg(aq) ® Hmc012-3.jpgO(l) mc012-4.jpg Omc012-5.jpg(g), the mc012-6.jpg is a ____.
a.
catalyst
c.
product
b.
solid
d.
reactant
 

 13. 
If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for fluorine be?
nitrogen trifluoride mc013-1.jpg nitrogen mc013-2.jpg fluorine
a.
6Fmc013-3.jpg
c.
6F
b.
Fmc013-4.jpg
d.
3Fmc013-5.jpg
 

 14. 
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
 

 15. 
What are the missing coefficients for the skeleton equation below?
Almc015-1.jpg(SOmc015-2.jpg)mc015-3.jpg(aq) mc015-4.jpg KOH(aq) ® Al(OH)mc015-5.jpg(aq) mc015-6.jpg Kmc015-7.jpgSOmc015-8.jpg(aq)
a.
1, 3, 2, 3
c.
4, 6, 2, 3
b.
2, 12, 4, 6
d.
1, 6, 2, 3
 

 16. 
The product of a combination reaction is Ba(OH)mc016-1.jpg. If one of the reactants is Hmc016-2.jpgO, what is the other reactant?
a.
Bamc016-3.jpgO
c.
BaH
b.
BaO
d.
BaOmc016-4.jpg
 

 17. 
Which of the following pairs of solutions produces a precipitate when combined?
a.
KOH and NH4Cl
c.
NH4Cl and AgNO3
b.
Na2SO4 and KCl
d.
Fe(NO)3 and KCl
 

 18. 
What is the driving force in the following reaction?
Ni(NOmc018-1.jpg)mc018-2.jpg(aq) mc018-3.jpg Kmc018-4.jpgS(aq) mc018-5.jpg NiS(s) mc018-6.jpg 2KNOmc018-7.jpg(aq)
a.
Ionic compounds are products.
c.
A precipitate is formed.
b.
A gas is formed.
d.
Ionic compounds are reactants.
 

 19. 
Which of the following is NOT a net ionic equation?
a.
Fe2+(aq) + 2Cl–(aq) + 2OH–(aq) ® Fe(OH)2(s) + 2Cl–(aq)
b.
Ag+(aq) + Cl–(aq) ® AgCl(s)
c.
Cu2+(aq) + S2–(aq) ® CuS(s)
d.
3Ca2+(aq) + 2P3–(aq) ® Ca3P2(s)
 

 20. 
A double-replacement reaction takes place when aqueous Namc020-1.jpgCOmc020-2.jpg reacts with aqueous Sn(NOmc020-3.jpg)mc020-4.jpg. You would expect one of the products of this reaction to be ____.
a.
NaSn
c.
SnCOmc020-6.jpg
b.
Na2COmc020-5.jpg
d.
CNOmc020-7.jpg
 

 21. 
The equation 2Cmc021-1.jpgHmc021-2.jpgOH mc021-3.jpg 9Omc021-4.jpg mc021-5.jpg 6COmc021-6.jpg mc021-7.jpg 8Hmc021-8.jpgO is an example of which type of reaction?
a.
single-replacement reaction
c.
decomposition reaction
b.
double-replacement reaction
d.
combustion reaction
 

 22. 
When solutions of two ionic compounds are combined and a solid forms, the process is called
a.
dissociation.
c.
precipitation.
b.
solvation.
d.
hydration.
 

 23. 
What is the net ionic equation for the precipitation reaction between copper(II) chloride and sodium hydroxide?
a.
Na+(aq) + Cl–(aq) ® NaCl(s)
c.
Cu2+(aq) + 2OH–(aq) ® Cu(OH)2(s)
b.
Cu2+(aq) + 2Cl–(aq) + 2Na+(aq) + 2OH–(aq) ® Cu(OH)2(s) + 2NaCl(s)
d.
Cu2+(aq) + 2OH–(aq) + 2Cl–(aq) ® Cu(OH)2(s) + 2Cl–(aq)
 

 24. 
Which of the following dissociates in water?
a.
AgCl
c.
MgCO3
b.
NaCl
d.
BaSO4
 

 25. 
What is the spectator ion in the equation
2Na+(aq)  + S2–(aq)+ Zn2+(aq) +  2NO3–(aq)® 2Na+(aq)+ 2NO3-(aq) + ZnS(s)?
a.
S2–(aq)
c.
Na+(aq)
b.
ZnS(s)
d.
none of these
 

 26. 
In a double-replacement reaction, the ____.
a.
products are a new element and a new compound
c.
reactants are usually two ionic compounds
b.
reactants are two elements
d.
products are always carbon dioxide and water
 

 27. 
In a combustion reaction, one of the reactants is always ____.
a.
a metal
c.
hydrogen
b.
oxygen
d.
nitrogen
 

 28. 
The type of reaction that takes place when one element reacts with a compound to form a new compound and a different element is a ____.
a.
single-replacement reaction
c.
decomposition reaction
b.
double-replacement reaction
d.
combination/synthesis reaction
 

Matching
 
 
Match each equation with its correct type
a.
synthesis
c.
single replacement
b.
acid-base reaction/double replacement
d.
precipitation reaction/double replacement
 

 29. 

 Hma029-1.jpgPOma029-2.jpg (aq)ma029-3.jpg 3KOH(aq) ma029-4.jpg Kma029-5.jpgPOma029-6.jpg(aq)ma029-7.jpg 3Hma029-8.jpgO(l)
 

 30. 

 2H2(g) + O2(g)  ma030-1.jpg 2H2O(g)
 

 31. 

 Ba(NOma031-1.jpg)ma031-2.jpg(aq) ma031-3.jpg Kma031-4.jpgSO4(aq) ma031-5.jpg BaSO4(s) ma031-6.jpg 2KNOma031-7.jpg(aq)
 

 32. 

 Mg(s) ma032-1.jpg 2HCl(aq) ma032-2.jpg MgClma032-3.jpg(aq) ma032-4.jpg Hma032-5.jpg(g)
 



 
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