MC_Chem1A_Sp08_LabQuiz1

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

____	1.	You can identify a metal by carefully determining its density. A 8.44 g piece of an unknown metal is 1.25 cm long, 2.50 cm wide, and 1.00 cm thick. What is a possible identity of the element?
a.	nickel, 8.90 g/cm3	
b.	aluminum, 2.70 g/cm3	
c.	titanium, 4.54 g/cm3	
d.	zirconium, 6.51 g/cm3	
e.	chromium, 7.20 g/cm3	

____	2.	Convert 5.000 ´ 10-2 meters to millimeters and express the answer in standard notation using the correct number of significant figures.
a.	50 mm	
b.	50.0 mm	
c.	50.00 mm	
d.	500 nm	
e.	5000 mm	

____	3.	What is the correct answer to the following expression: (18 + 95) ´ 0.077351? Carry out the addition operation first.
a.	8.7	
b.	8.74	
c.	8.741	
d.	8.7407	
e.	8.74066	

____	4.	Express 0.38300 in exponential notation.
a.	3.8300 ´ 10-1	
b.	3.83 ´ 10-1	
c.	3.830 ´ 10-2	
d.	3.83 ´ 101	
e.	3.8300 ´ 101	

____	5.	The radius of a lithium atom is 152 pm. What is the volume of a lithium atom is cubic centimeters? The volume of a sphere is (4/3)pr3 and 1 pm = 10-12 m.
a.	1.47 ´ 10-27 cm3	
b.	1.47 ´ 10-23 cm3	
c.	1.47 ´ 10-20 cm3	
d.	1.47 ´ 10-14 cm3	
e.	1.47 ´ 107 cm3	

____	6.	The smallest unit into which a pure substance such as sugar or water can be divided, while still retaining its composition and chemical properties is a(n) ____.
a.	ion	
b.	atom	
c.	isotope	
d.	mixture	
e.	molecule	

____	7.	Chalcopyrite is a copper containing ore. This ore contains 1 iron atom and 2 sulfur atoms for each copper atom. What is the formula of chalcopyrite?
a.	CuFeS	
b.	CuFe(2S)	
c.	CuFeS2	
d.	2SCuFe	
e.	CuFeS2	

____	8.	Identify the ions present in KHCO3.
a.	KHCO3 is not ionic.	
b.	KH+, and CO3-	
c.	K+, H+, C4+, and O2-	
d.	KH2+ and CO32-	
e.	K+ and HCO3-	

____	9.	Which atom is most likely to form a 1- ion?
a.	I	
b.	S	
c.	Ag	
d.	P	
e.	Na	

____	10.	Which atom is most likely to form a 3+ ion?
a.	Li	
b.	Sr	
c.	Kr	
d.	Fe	
e.	P	

____	11.	Which of the following formulas is not correct?
a.	Al2(SO4)3	
b.	NaClO3	
c.	Ba2O3	
d.	Mg(NO3)2	
e.	KH2PO4	

____	12.	What is the charge on the lead ion in PbS2?
a.	4-	
b.	2-	
c.	0	
d.	2+	
e.	4+	

____	13.	What is the correct formula for cobalt(III) oxide?
a.	CoO	
b.	Co3O	
c.	Co3O2	
d.	Co2O3	
e.	CoO3	

____	14.	All of the following are named correctly EXCEPT
a.	LiClO4; lithium perchlorate.	
b.	CaHPO4; calcium hydrogen phosphide.	
c.	NaCN; sodium cyanide.	
d.	Mg(OH)2; magnesium hydroxide.	
e.	CaSO3; calcium sulfite.	

____	15.	What is the molar mass of ammonium sulfate?
a.	110.0 g/mol	
b.	114.1 g/mol	
c.	132.1 g/mol	
d.	144.6 g/mol	
e.	168.9 g/mol	

____	16.	If 1.00 g of an unknown molecular compound contains 4.55 ´ 1021 molecules, what is its molar mass (Avogadro Number = 6.023 x 1023)?
a.	44.0 g/mol	
b.	66.4 g/mol	
c.	72.1 g/mol	
d.	98.1 g/mol	
e.	132 g/mol	

____	17.	Ammonia is prepared by reacting nitrogen and hydrogen gases at high temperature according to the unbalanced chemical equation below.

__ N2(g) + __ H2(g) ® __ NH3(g)

What are the respective coefficients when the equation is balanced with the smallest whole numbers?
a.	1, 1, 1	
b.	1, 3, 1	
c.	1, 3, 2	
d.	2, 1, 2	
e.	2, 3, 2	

____	18.	Which of the following is the greatest mass?
a.	2.3 ´ 109 pg	
b.	1.5 ´ 108 ng	
c.	6.6 ´ 105 mg	
d.	8.4 ´ 102 mg	
e.	3.0 ´ 10-1 g	

____	19.	The radius of a helium atom is 31 pm. What is the radius in nanometers?
a.	3.1 ´ 10-9 nm	
b.	3.1 ´ 10-6 nm	
c.	3.1 ´ 10-5 nm	
d.	3.1 ´ 10-3 nm	
e.	3.1 ´ 10-2 nm	

____	20.	What is the correct answer to the following expression: 2.97 ´ 10-5 + 6.13 ´ 10-3?
a.	6.1 ´ 10-3	
b.	6.16 ´ 10-3	
c.	6.160 ´ 10-3	
d.	6.1597 ´ 10-3	
e.	6.15970 ´ 10-5	

____	21.	Which of the following substances is an element?
a.	CO	
b.	S8	
c.	NaCl	
d.	C6H12O6	
e.	CO2	

____	22.	Chemical reactions are often studied at 25 °C. What is this temperature in Fahrenheit?
a.	45 °F	
b.	57 °F	
c.	68 °F	
d.	77 °F	
e.	103 °F	

MC_Chem1A_Sp08_LabQuiz1
Answer Section

MULTIPLE CHOICE

	1.	ANS:	B	PTS:	1	OBJ:	1.4 Physical Properties

	2.	ANS:	C	PTS:	1	OBJ:	1.8 Mathematics of Chemistry

	3.	ANS:	B	PTS:	1	OBJ:	1.8 Mathematics of Chemistry

	4.	ANS:	A	PTS:	1	OBJ:	1.8 Mathematics of Chemistry

	5.	ANS:	B	PTS:	1	OBJ:	1.8 Mathematics of Chemistry

	6.	ANS:	E	PTS:	1	OBJ:	3.1 Molecules | Compounds | and Formulas

	7.	ANS:	C	PTS:	1	OBJ:	3.1 Molecules | Compounds | and Formulas

	8.	ANS:	E	PTS:	1	OBJ:	3.3 Ionic Compounds: Formulas | Names | and Properties

	9.	ANS:	A	PTS:	1	OBJ:	3.3 Ionic Compounds: Formulas | Names | and Properties

	10.	ANS:	D	PTS:	1	OBJ:	3.3 Ionic Compounds: Formulas | Names | and Properties

	11.	ANS:	C	PTS:	1	OBJ:	3.3 Ionic Compounds: Formulas | Names | and Properties

	12.	ANS:	E	PTS:	1	OBJ:	3.3 Ionic Compounds: Formulas | Names | and Properties

	13.	ANS:	D	PTS:	1	OBJ:	3.3 Ionic Compounds: Formulas | Names | and Properties

	14.	ANS:	B	PTS:	1	OBJ:	3.3 Ionic Compounds: Formulas | Names | and Properties

	15.	ANS:	C	PTS:	1	OBJ:	3.5 Formulas | Compounds | and the Mole

	16.	ANS:	E	PTS:	1	OBJ:	3.5 Formulas | Compounds | and the Mole

	17.	ANS:	C	PTS:	1	OBJ:	4.2 Balancing Chemical Equations

	18.	ANS:	D	PTS:	1	OBJ:	1.6 Units of Measurement

	19.	ANS:	E	PTS:	1	OBJ:	1.6 Units of Measurement

	20.	ANS:	B	PTS:	1	OBJ:	1.8 Mathematics of Chemistry

	21.	ANS:	B	PTS:	1	OBJ:	1.2 Elements and Atoms

	22.	ANS:	D	PTS:	1	OBJ:	1.6 Units of Measurement