CHEM 4 – Spring 2017
Exam #1 – 10 am Section
1) What is the name of HBrO (aq)?
A) bromic acid
D) hypobromous acid
Answer key (see last page)
B) bromous acid
E) hydrobromic acid
C) hypobromic acid
F) hydrobromous acid
2) Which of the is true for molecular compounds, but not for ionic compounds?
A) They are also called “salts”.
B) Their atoms end up with the same number of electrons as the nearest noble gas.
C) They typically contain a combination of metal and non-metal atoms.
D) Their atoms share electrons.
E) The cation and anion combine in a ratio that cancels their charges.
3) A particular compound is found to contain only carbon and hydrogen. A sample of this compound has
23.5 g of carbon and 5.1 g of hydrogen. If a second sample is found to contain 18.2 grams of
hydrogen, what must be the mass of this second sample?
A) 102 g
B) 3.2 g
C) 87.0 g
D) 124 g
E) 95.3 g
F) 74.3 g
4) Which of the following formulas is not a possible ionic compound based on predicted ion charges?
A) CaO
B) MgI2
C) NaN3
D) K2S
5) Which of the following statements about the modern periodic table (PT) is false?
A) The modern PT lists the elements from smallest to largest atomic number.
B) New elements can still be added as they are created.
C) Elements in the same column (i.e. same “group”) have similar properties.
D) There are elements still missing between La (#57) and Hf (#72) on the periodic table.
E) The modern PT has more metals than non-metals.
6) What is the formula for nitric acid?
A) HNO4 (aq)
B) H2NO3 (aq)
D) H2NO4 (aq)
E) HNO3 (aq)
7) Which of the following is an example of a ionic compound?
A) N2O4
B) Cl2
C) SO2
8) What is the name of Sn(CrO4)2?
A) antimony(II) chromate
D) antimony(II) dichromate
C) H2NO2 (aq)
F) HNO2 (aq)
D) NH4Cl
B) antimony(VI) dichromate
E) tin(IV) chromate
9) Which of the following properties is not a physical property?
A) length
B) color
C) flammability
D) mass
E) C2H4
C) tin(II) chromate
F) tin(IV) dichromate
E) melting point
F) density
10) How many electrons would be required to equal the mass of a single boron-11 nucleus? Note: the
proton mass = 1.0073 amu; the neutron mass = 1.0087 amu; and the electron mass = 0.00055
amu. Round your answer up to the nearest whole number.
A) 20,161
B) 11,081
C) 22,816
D) 11,089
E) 20,150
F) 22,831
11) What is the formula for carbon tetrachloride?
A) CCl7
B) C2Cl2
C) CCl4
12) Which of the following ions has a -3 charge?
A) acetate ion
B) arsenate ion
D) sulfate ion
E) hydrogen phosphate ion
D) CCl3
E) CCl5
C) carbonate ion
13) Which of the following statements does not agree with Rutherford’s nuclear theory of the atom?
A) For an atom to be neutral, it must have the same number of protons and electrons.
B) All of an atom’s positive charge is located in the nucleus.
C) An atom’s protons and neutrons account for most of its mass.
D) An atom’s nucleus accounts for most of it volume.
E) An atom’s electrons are dispersed in the empty space outside of the nucleus.
1
CHEM 4 – Spring 2017
Exam #1 – 10 am Section
Answer key (see last page)
14) What needs to happen to an atom of Ba to turn it into a Ba2+ ion?
A) it must gain 2 electrons
B) it must gain 2 neutrons
D) it must lose 2 electrons
E) it must lose 2 neutrons
C) it must gain 2 protons
F) it must lose 2 protons
15) What is the formula for nickel(II) hydroxide?
A) Ni(OH)2
B) Ni2OH
D) NiOH
E) NiOH2
C) Ni2OH2
F) Ni(OH2)2
16) A new man-made element is found to have two isotopes. One isotope, has an abundance of 68.2%
and a mass of 296.5 amu. The other isotope has a mass of 299.6 amu. What atomic mass should be
written on the periodic table for this new element?
A) 297.0 amu
B) 299.0 amu
C) 297.5 amu
D) 298.6 amu
E) 298.1 amu
17) What is the formula for silver sulfate?
A) Ag3SO3
B) Ag3SO4
D) Ag2SO3
E) AgSO4
C) Ag(SO3)2
F) Ag2SO4
18) What is the symbol for the isotope that has 52 protons and 77 neutrons?
A) 77Cr
B) 129Te
C) 129Ir
D) 52Cr
19) How many atoms are present in 1 unit of Pb(HC2O4)4?
A) 20
B) 8
C) 32
20) What is the name for NO3?
A) nitrate ion
D) nitrite ion
E)
77Te
D) 29
B) nitrogen trioxide
E) nitrogen(VI) oxide
F)
77Ir
E) 4
C) mononitrogen trioxide
F) nitrogen(III) oxide
21) Which following statements about the element Cu is false?
A) It is an transition metal
B) It has properties similar to Ag
C) It always has 34 neutrons
D) It should conduct electricity
E) It is a type II metal
F) Its atomic mass is 63.55 amu
22) Which of the following lists an alkali metal, a halogen, and a noble gas metal, in that order?
A) Ca, F, Cr
B) Zn, Ne, Cu
C) K, Cl, He
D) Li, Ar, I
23) Which of the following is not typically considered to be a diatomic element?
A) iodine
B) bromine
C) sulfur
D) hydrogen
E) chlorine
F) nitrogen
24) Which of the following is an example of a sample of matter?
A) light
B) sound
C) love
D) this test
25) What is the name for NaI?
A) monosodium monoiodide
D) sodium monoiodide
1)
2)
3)
4)
5)
D
D
A
C
D
6) E
7) D
8) E
9) C
10) A
B) sodium(I) iodide
E) sodium iodide
C) sodium(I) monoiodide
F) sodium iodine
Answers (each question is worth 4 points)
11) C
16) C
12) B
17) F
13) D
18) B
14) D
19) D
15) A
20) B
21)
22)
23)
24)
25)
C
C
C
D
E
2