Problems Set #2
1. Which of the following is not the correct chemical formula for the compound named?
a. hydrocyanic acid HCN(aq)
b. calcium sulfate CaSO 4
c. beryllium oxide BeO
d. nickel(II) peroxide Ni O
e. ammonium chromate (NH )4 2O 4
2. The correct name for FeO is
a. iron oxide
b. iron(II) oxide
c. iron(III) oxide
d. iron monoxide
e. iron(I) oxide
3. Titanium(IV) oxide has the formula
a. Ti O
e. Ti4O 2
4. The formula for calcium hydrogen sulfate is
a. Ca(SO )4 2
b. CaS 2
c. Ca(HSO )
d. Ca 2SO 4
e. Ca 2
5. The name of the compound NH ClO is
a. ammonium perchlorate
b. ammonium chlorite
c. ammonium chlorate
d. ammonium hypochlorate
e. ammonium chloride
6. What is the name for HPO 2 ?
a. phosphate ion
b. phosphite ion
c. hydrogen phosphate ion
d. hydrogen phosphite ion
e. hydrogen phosphorus oxide ion
7. The substance ClO 3 is best described as
a. a molecule
b. a polyatomic ion
c. a polyatomic molecule
d. a mixture
8. The formula for the compound formed from the polyatomic ions NH + and PO 3 is
a. NH (4O ) 4 3
b. NH P4 4
c. (NH ) PO
4 3 4
d. (NH )4 2O ) 4 2
9. Which of the following is named incorrectly? What should its name be?
a. FeSO ;4iron(II) sulfate
b. Sn (PO ) ; tin(IV) phosphate
3 4 4
c. K P; potassium phosphide
d. Fe(OH) ;2iron(III) hydroxide
e. All are correct.
10. Aluminum oxide solid reacts with gaseous carbon monoxide to produce aluminum metal and
carbon dioxide gas. Write the balanced equation for this reaction.
11. Sodium metal reacts with water to produce aqueous sodium hydroxide and hydrogen gas. Write
the balanced equation for this reaction.
When the following equations are balanced using the smallest possible integers, what is the number in
front of the bold-underlined substance in each case?
12. C 3 (8) + O (2) CO (g)2+ H O(g)2
13. H 3O (4q) + Ca(OH) (aq2 Ca (PO )3(aq)4 2H O(l)_____
14. Na(s) + H_____ NaOH(aq) + H (g) 2
e. 6 15. MgO(s) Mg(s) + O (g) 2
16. Al(s) + O 2g) Al O2(3)
17. The sum of the coefficients when the following equation is balanced is
BaSO +4K PO3 Ba4(PO ) 3 K S4 2 2 4
18. Which of the following statements concerning balancing equations is false?
a. There must always be a coefficient of 1 in an equation balanced in standard form.
b. The ratio of coefficients is much more meaningful than an individual coefficient in a balanced
c. The total number of atoms must be the same on the reactants side and the product side of the
d. When there are two products, the order in which they are written does not matter.
e. At least two of these statements (a-d) are false.
19. Consider the reaction represented by the unbalanced equation NH + O NO3+ H 2. 2
For every 1.00 mol of NH th3t reacts, _____ mol of O is re2uired.
e. none of these
20. Consider a reaction given by the equation aA + bB cC + dD. In this equation A, B, C, D represent
chemicals, and a, b, c, d represent coefficients in the balanced equation. For a given reaction, how
many values are there for the quantity “c/d”?
e. an infinite number 21. Choose the response that best answers the question “Why do we not change subscripts when
balancing a chemical equation?”
a. There’s no real reason not to, it’s just something that is not done.
b. We never change subscripts because atoms are neither created nor destroyed. This is part of the
law of conservation of matter.
c. It’s fine to do once in awhile, but don’t make a habit of it.
d. We can change subscripts. We can’t change coefficients.
e. Compounds composed of the same elements and having different subscripts are different
22. Balance the equation
NaBH + 4F N3BF + B H 4 2 6
23. Balance the equation
MgCl +2K PO 3 Mg4(PO ) +3KCl 4 2
24. Balance the equation
C H + O CO + H O
6 14 2