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Chapter 10 - Chemical Reactions - Section 1



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

 1. 

Balancing a chemical equation so that the same number of atoms of each element is found in both the reactants and the products is an illustration of
a.
activation energy.
c.
the law of conservation of mass.
b.
the law of conservation of energy.
d.
a double-replacement reaction.
 

 2. 

How many atoms are represented in the formula CaCO3?
a.
three
c.
five
b.
four
d.
six
 

 3. 

The law of conservation of mass means that a chemical equation must show the same
a.
kind of atom on both sides of the arrow.
b.
number of atoms on both sides of the arrow.
c.
number and kind of atom on both sides of the arrow.
d.
None of the above
 

 4. 

For a chemical reaction to occur,
a.
chemical bonds must break.
c.
new bonds must form.
b.
atoms must rearrange.
d.
All of the above
 

 5. 

Which of the following is NOT an example of a chemical reaction?
a.
milk turning sour
c.
a match burning
b.
food being digested
d.
ice melting
 

 6. 

In a chemical equation,
a.
reactants appear before the arrow.
b.
products appear after the arrow.
c.
a plus sign separates the formulas of two or more reactants or products.
d.
All of the above
 

 7. 

How many nitrogen atoms are in the chemical formula Ca(NO3)2?
a.
1
c.
3
b.
2
d.
6
 

 8. 

When the substances that make up baking powder are mixed with water, carbon dioxide gas is formed. This is an example of
a.
a physical reaction.
c.
a change of state.
b.
a chemical reaction.
d.
a nuclear reaction.
 

 9. 

Which of the following is NOT an example of the law of conservation of mass?
a.
The mass is the same before and after a reaction takes place.
b.
A chemical equation is balanced.
c.
The same number and kind of atom are on both sides of the arrow in a chemical equation.
d.
The reactants are different from the products.
 

 10. 

The new substances produced in a chemical reaction have
a.
the same properties as the original substances.
b.
different physical properties from the original substances.
c.
different chemical properties from the original substances.
d.
different physical and chemical properties from the original substances.
 

 11. 

A shorthand method of identifying an element is a chemical
a.
symbol.
c.
reaction.
b.
change.
d.
formula.
 
 
Determine the balanced equation for each of the following:
 

 12. 

When calcium bromide reacts with chlorine, bromine and calcium chloride are produced. Which of the following equations describes this reaction?
a.
CaBr2 + Cl2 ® Br2 + CaCl2
c.
CaBr2 + Cl2 ® Br2 + 2CaCl2
b.
2CaBr2 + Cl2 ® Br2 + 2CaCl2
d.
2CaBr + Cl2 ® Br2 + 2CaCl
 

 13. 

Al + HCl ® AlCl3 + H2
a.
Al + HCl ® AlCl3 + H2
c.
Al + 3HCl ® AlCl3 + 3H2
b.
2Al + 6HCl ® 2AlCl3 + 3H2
d.
Al + 3HCl ® AlCl3 + H2
 

 14. 

C2H6O + O2 ® CO2 + H2O
a.
C2H6O + O2 ® CO2 + H2O
c.
C2H6O + 3O2 ® 2CO2 + 3H2O
b.
C2H6O + 3O2 ® 2CO2 + H2O
d.
2C2H6O + 3O2 ® 2CO2 + 3H2O
 

 15. 

How many atoms of oxygen are there in Al2(SO4)3?
a.
12
c.
4
b.
7
d.
15
 

 16. 

Which of the following is the chemical formula for the diatomic element oxygen?
a.
O
c.
O2
b.
O1
d.
2O
 



 
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