Name:______________________________Class: _________________ Date: _________________
Assessment
Chapter Test A
Teacher Notes and Answers
7
Chemical Formulas and
Chemical Compounds
TEST A
1. d
2. a
3. b
4. a
5. c
6. c
7. d
8. b
9. d
10. a
11. c
12. d
13. c
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
b
b
d
c
a
c
d
b
b
c
b
d
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Modern Chemistry
1
Chapter Test
Name:______________________________Class: _________________ Date: _________________
Assessment
Chapter Test A
Chapter: Chemical Formulas and Chemical Compounds
In the space provided, write the letter of the term or phrase that best completes
each statement or best answers each question. For calculations that require the
atomic mass of an element, round the atomic mass found on the periodic table to
two decimal places.
_____ 1. What follows an element’s symbol in a chemical formula to indicate
the number of atoms of that element in one molecule of the compound?
a. charge sign
b. superscripted number
c. number in parentheses
d. subscripted number
_____ 2. The chemical formula for an ionic compound represents one
a. formula unit.
b. ion.
c. molecule.
d. cation.
_____ 3. What is the correct notation for a calcium ion whose outershell is a full
octet?
a. Ca1 +
b. Ca2 +
c. Ca1 d. Ca2 _____ 4. What is the correct name for the NO 3 ion?
a. nitrate
b. nitrite
c. nitride
d. nitrogen oxide
_____ 5. What is the correct formula for copper(I) cyanide?
a. CuCy
b. CuCy2
c. CuCN
d. Cu2CN
_____ 6. What is the correct name for the acid CH3COOH?
a. carbonic acid
b. carbonate acid
c. acetic acid
d. acetous acid
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Modern Chemistry
2
Chapter Test
Name:______________________________Class: _________________ Date: _________________
Chapter Test A, continued
_____ 7. What is the correct name for the compound P2Cl4.
a. phosphorus chloride
b. phosphorus tetrachloride
c. diphosphorus chloride
d. diphosphorus tetrachloride
_____ 8. What is the correct formula for the compound made of magnesium and
nitrogen?
a. Mg2N3
b. Mg3N2
c. MgN2
d. MgN
_____ 9. Oxidation numbers are used to indicate the
a. charge on an ion.
b. number of atoms or ions in a compound.
c. type of bond holding particles together in a compound.
d. distribution of electrons among the bonded particles in a compound.
_____ 10. Atoms have an oxidation number of zero in a(n)
a. pure element.
b. acid.
c. ionic compound.
d. molecular compound.
_____ 11. What is the oxidation number of nickel in NiCO3?
a. 0
b. +1
c. +2
d. +3
_____ 12. What is the correct name for the compound Ni2CO3 using the Stock
system?
a. nickel(II) oxide
b. dinickel trioxide
c. nickel trioxide
d. nickel(III) oxide
3
_____ 13. What is the oxidation number of phosphorus in the PO 4 ion?
a. 3
b. 0
c. +5
d. +8
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Modern Chemistry
3
Chapter Test
Name:______________________________Class: _________________ Date: _________________
Chapter Test A, continued
_____ 14. What is the correct formula for the compound platinum(VI) fluoride?
a. PtF3
b. PtF6
c. Pt6F2
d. Pt6F
_____ 15. The formula mass of any coumpound is described in units of
a. grams.
b. u.
c. moles.
d. grams per mole.
_____ 16. The molar mass of water is equal to
a. 1 g of O plus 2 g of H.
b. 1 g of O plus 1 g of H.
c. the mass of 1 mol of O plus the mass of 1 mol of H.
d. the mass of 1 mol of O plus the mass of 2 mol of H.
_____ 17. What is the molar mass of pure tin?
a. 1.00 g/mol
b. 47.88 g/mol
c. 118.71 g/mol
d. 237.42 g/mol
_____ 18. How many moles of compound are there in 15.0 g of potassium
dichromate, K2Cr2O7? (The molar mass of K2Cr2O7 is 294.2 g.)
a. 0.0510 mol
b. 11.0 mol
c. 15.0 mol
d. 294 mol
_____ 19. What is the mass percentage of cobalt in cobalt(II) fluoride, CoF2?
a. 33.33%
b. 39.20%
c. 60.80%
d. 96.93%
_____ 20. What is the mass of 4.80 mol of barium hydride, BaH2?
a. 4.80 g
b. 29.0 g
c. 139 g
d. 669 g
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Modern Chemistry
4
Chapter Test
Name:______________________________Class: _________________ Date: _________________
Chapter Test A, continued
_____ 21. Which of the following molecular formulas does not have the
corresponding empirical formula XY2Z?
a. X2Y4Z2
b. XYZ
c. X6Y12Z6
d. X3Y6Z3
_____ 22. The simplest whole-number ratio of moles of each element in a
compound is known as the
a. percent composition.
b. empirical formula.
c. Stock formula.
d. molecular formula.
_____ 23. What is the empirical formula for a compound that contains 12.62% Li,
29.17% S, and 58.21% O?
a. LiSO2
b. LiS2O6
c. Li2SO4
d. Li2SO3
_____ 24. What is the molecular formula for the compound with a formula mass
of 58.12 u and an empirical formula of C2H5?
a. C2H5
b. C4H10
c. C6H15
d. C8H20
_____ 25. What is the molecular formula for the compound that is made up of
30.45 g N and 69.55 g O, and has a formula mass of 92.02 u?
a. NO
b. N2O2
c. NO2
d. N2O4
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Modern Chemistry
5
Chapter Test