Name:     ID: 
 
    Email: 

Chemical Reactions

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

1. 
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
 

2. 
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.
 

3. 
In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is
a.
H.
c.
H2.
b.
2H.
d.
OH.
 

4. 
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
 

5. 
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.
 

6. 
According to the law of conservation of mass, the total mass of the reacting substances is
a.
always more than the total mass of the products.
b.
always less than the total mass of the products.
c.
sometimes more and sometimes less than the total mass of the products.
d.
always equal to the total mass of the products.
 

7. 
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.
 

8. 
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
 

9. 
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
 

10. 
In an equation, the symbol for a substance in water solution is followed by
a.
(1).
c.
(aq).
b.
(g).
d.
(s).
 

11. 
When the equation Fe3O4 + Al ® Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?
a.
3
c.
6
b.
4
d.
9
 

12. 
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
 

13. 
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.
 

14. 
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.
 

15. 
Which equation is NOT balanced?
a.
2H2 + O2 ® 2H2O
b.
4H2 + 2O2 ® 4H2O
c.
H2 + H2 + O2 ® H2O + H2O
d.
2H2 + O2 ® H2O
 

16. 
The equation AX ® A + X is the general equation for a
a.
synthesis reaction.
c.
combustion reaction.
b.
decomposition reaction.
d.
single-replacement reaction.
 

17. 
The equation AX + BY ® AY + BX is the general equation for a
a.
synthesis reaction.
c.
single-replacement reaction.
b.
decomposition reaction.
d.
double-replacement reaction.
 

18. 
The equation A + X ® AX is the general equation for a(n)
a.
combustion reaction.
c.
synthesis reaction.
b.
ionic reaction.
d.
double-replacement reaction.
 

19. 
In what kind of reaction does a single compound produce two or more simpler substances?
a.
decomposition reaction
c.
single-replacement reaction
b.
synthesis reaction
d.
ionic reaction
 

20. 
The equation A + BX ® AX + B is the general equation for a
a.
double-replacement reaction.
c.
single-replacement reaction.
b.
decomposition reaction.
d.
combustion reaction.
 

21. 
In what kind of reaction do the ions of two compounds exchange places in aqueous solution to form two new compounds?
a.
synthesis reaction
c.
decomposition reaction
b.
double-replacement reaction
d.
combustion reaction
 

22. 
The reaction 2Mg(s) + O2(g) ® 2MgO(s) is a
a.
synthesis reaction.
c.
single-replacement reaction.
b.
decomposition reaction.
d.
double-replacement reaction.
 

23. 
The reaction Mg(s) + 2HCl(aq) ® H2(g) + MgCl2(aq) is a
a.
composition reaction.
c.
single-replacement reaction.
b.
decomposition reaction.
d.
double-replacement reaction.
 

24. 
The reaction Pb(NO3)2(aq) + 2KI(aq) ® PbI2(s) + 2KNO3(aq) is a
a.
double-replacement reaction.
c.
decomposition reaction.
b.
synthesis reaction.
d.
combustion reaction.
 

25. 
The reaction 2KClO3(s) ® 2KCl(s) + 3O2(g) is a(n)
a.
synthesis reaction.
c.
combustion reaction.
b.
decomposition reaction.
d.
ionic reaction.
 

26. 
The decomposition of a substance by an electric current is called
a.
electrolysis.
c.
ionization.
b.
conduction.
d.
transformation.
 

27. 
In the equation 2Al(s) + 3Fe(NO3)2(aq) ® 3Fe(s) + 2Al(NO3)3(aq), iron has been replaced by
a.
nitrate.
c.
aluminum.
b.
water.
d.
nitrogen.
 

28. 
An insoluble gas that forms in a double-replacement reaction in aqueous solution
a.
bubbles out of solution.
c.
disassociates into ions.
b.
forms a precipitate.
d.
reacts with the water.
 

29. 
In a double-replacement reaction, hydrogen chloride and sodium hydroxide react to produce sodium chloride. Another product is
a.
sodium hydride.
c.
water.
b.
potassium chloride.
d.
hydrogen gas.
 

30. 
Predict the product of the following reaction: MgO + CO2 ®
a.
MgCO3
c.
MgC + O3
b.
Mg + CO3
d.
MgCO2 + O
 

31. 
What is the balanced equation when aluminum reacts with copper(II) sulfate?
a.
Al + Cu2S ® Al2S + Cu
c.
Al + CuSO4 ® AlSO4 + Cu
b.
2Al + 3CuSO4 ® Al2(SO4)3 + 3Cu
d.
2Al + Cu2SO4 ® Al2SO4 + 2Cu
 

32. 
Predict what happens when calcium metal is added to a solution of magnesium chloride.
a.
No reaction occurs.
c.
Magnesium calcite forms.
b.
Calcium chloride forms.
d.
Gaseous calcium is produced.
 

33. 
Predict what happens when zinc is added to water.
a.
No reaction occurs.
c.
Zinc oxide forms.
b.
Steam is produced.
d.
Hydrogen is released.
 



 
Submit          Reset Help
Hosted by www.Geocities.ws

1