Example_LecExam1

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

____	1.	A pure substance composed of two or more different elements is
a.	a homogeneous mixture.	
b.	a heterogeneous mixture.	
c.	a polyelement.	
d.	an atom.	
e.	a chemical compound.	

____	2.	All of the following are examples of physical properties EXCEPT
a.	gold is yellow in appearance.	
b.	aluminum oxidizes to form Al2O3.	
c.	copper is ductile and malleable.	
d.	mercury is a liquid at room temperature.	
e.	the density of silver is 10.45 g/cm3.	

____	3.	Which of the following is an extensive property?
a.	volume	
b.	density	
c.	melting point	
d.	boiling point	
e.	both melting and boiling point	

____	4.	All of the following are examples of chemical change EXCEPT
a.	the tarnishing of silver.	
b.	the rusting of iron.	
c.	the combustion of butane gas.	
d.	the condensation of steam.	
e.	the decomposition of water to hydrogen gas and oxygen gas.	

____	5.	Thermostats are often set to 68 °F. What is this temperature in Celsius?
a.	2.0 ´ 101 °C	
b.	25 °C	
c.	38 °C	
d.	56 °C	
e.	7.0 ´ 102 °C	

____	6.	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	

____	7.	The wavelength of light emitted from a green laser pointer is 5.32 ´ 102 nm. What is the wavelength in meters?
a.	5.32 ´ 10-9 m	
b.	5.32 ´ 10-7 m	
c.	5.32 ´ 10-5 m	
d.	5.32 ´ 10-3 m	
e.	5.32 ´ 10-1 m	

____	8.	At 25 °C, the density of oxygen in air is 0.275 g/L. What volume is occupied by 25 kg of oxygen at 25 °C?
a.	1.1 ´ 10-5 L	
b.	6.9 L	
c.	2.8 ´ 102 L	
d.	6.9 ´ 103 L	
e.	9.1 ´ 104 L	

____	9.	Beta (b) particles are identical to ____.
a.	neutrons	
b.	electrons	
c.	helium nuclei	
d.	light	
e.	protons	

____	10.	How many protons, neutrons, and electrons are in an oxygen-18 atom?
a.	6 protons, 8 neutrons, 4 electron	
b.	6 protons, 10 neutrons, 8 electrons	
c.	8 protons, 8 neutrons, 8 electrons	
d.	8 protons, 10 neutrons, 8 electrons	
e.	8 protons, 10 neutrons, 18 electrons	

____	11.	What is the identity of ?
a.	Hf	
b.	Zr	
c.	Rf	
d.	Ge	
e.	Cu	

____	12.	Give the mass number of a bromine atom with 46 neutrons.
a.	11	
b.	35	
c.	46	
d.	80	
e.	81	

____	13.	An element consists of two isotopes. The abundance of one isotope is 95.72% and its atomic mass is 114.9041 u. The atomic mass of the second isotope is 112.9043 u. What is the average atomic mass of the element?
a.	113.9 u	
b.	113.0 u	
c.	113.9 u	
d.	114.8 u	
e.	115.1 u	

____	14.	Calculate the number of moles in 39 g silicon.
a.	9.1 ´ 10-4 mol	
b.	0.72 mol	
c.	1.4 mol	
d.	11 mol	
e.	1.1 ´ 103 mol	

____	15.	The molar mass of carbon is 12.01 g/mole. What is the mass of a 1.0 ´ 109 carbon atoms?
a.	1.4 ´ 10-16 g	
b.	2.0 ´ 10-14 g	
c.	1.2 ´ 10-8 g	
d.	8.3 ´ 107 g	
e.	7.2 ´ 1015 g	

____	16.	What element is in the fifth period in Group 3A?
a.	As	
b.	Nb	
c.	P	
d.	In	
e.	Tl	

____	17.	Which atom is most likely to form a 3+ ion?
a.	Li	
b.	Sr	
c.	Kr	
d.	Fe	
e.	P	

____	18.	Sodium sulfate has the chemical formula Na2SO4. Based on this information, the formula for chromium(III) sulfate is ____.
a.	Cr3(SO4)2	
b.	Cr2(SO4)3	
c.	Cr(SO4)2	
d.	Cr2SO4	
e.	CrSO4	

____	19.	What is the correct formula for vanadium(V) sulfide?
a.	V2S5	
b.	V5S	
c.	VS5	
d.	V10S5	
e.	V5S2	

____	20.	What is the molar mass of cobalt(II) iodide hexahydrate?
a.	212.8 g/mol	
b.	293.9 g/mol	
c.	312.7 g/mol	
d.	420.8 g/mol	
e.	465.1 g/mol	

____	

Example_LecExam1
Answer Section

MULTIPLE CHOICE

	1.	ANS:	E	PTS:	1	OBJ:	1.1 Classifying Matter

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

	3.	ANS:	A	PTS:	1	OBJ:	1.4 Physical Properties

	4.	ANS:	D	PTS:	1	OBJ:	1.5 Physical and Chemical Changes

	5.	ANS:	A	PTS:	1	OBJ:	1.6 Units of Measurement

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

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

	8.	ANS:	E	PTS:	1	OBJ:	1.8 Mathematics of Chemistry

	9.	ANS:	B	PTS:	1	
OBJ:	2.1 Protons | Electrons | and Neutrons: Development of Atomic Structure

	10.	ANS:	D	PTS:	1	OBJ:	2.2 Atomic Number and the Mass

	11.	ANS:	D	PTS:	1	OBJ:	2.2 Atomic Number and the Mass

	12.	ANS:	E	PTS:	1	OBJ:	2.2 Atomic Number and the Mass

	13.	ANS:	D	PTS:	1	OBJ:	2.4 Atomic Weight	

	14.	ANS:	C	PTS:	1	OBJ:	2.5 Atoms and the Mole

	15.	ANS:	B	PTS:	1	OBJ:	2.5 Atoms and the Mole

	16.	ANS:	D	PTS:	1	OBJ:	2.6 The Periodic Table

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

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

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

	20.	ANS:	D	PTS:	1	OBJ:	3.5 Formulas | Compounds | and the Mole