Name: __________________
Date: __________________
Honors Chemistry Quiz 2
True False: (1 pt ea)
1.
2.
3.
4.
(T/F) The formula for chromium (II) iodide is CrI2
(T/F) The purpose of a generator is to rotate a shaft for multiple uses
(T/F) The cartesian diver floats back up because the air in the ketchup pouch increases in volume
(T/F) The poly density bottle works because alcohol has a greater affinity to salt than water does.
Therefore the salt and alcohol sink to the bottom and the water is on top
Multiple Choice: For each of the following, choose the best answer. (2 pts each)
1. The law of constant composition applies to ________.
A) solutions
C) compounds
B) heterogeneous mixtures
D) homogeneous mixtures
E) solids
2. The charge on an electron was determined in the ________.
A) cathode ray tube, by J. J. Thomson
C) Millikan oil drop experiment
of matter
B) Rutherford gold foil experiment
D) Dalton atomic theory
E) atomic theory
3. Consider the following selected postulates of Dalton's atomic theory:
(i) Each element is composed of extremely small particles called atoms.
(ii) Atoms are indivisible.
(iii) Atoms of a given element are identical.
(iv) Atoms of different elements are different and have different properties.
Which of the postulates is(are) no longer considered valid?
A) (i) and (ii)
B) (ii) only
C) (ii) and (iii)
D) (iii) only
E) (iii) and (iv)
4. Which one of the following is often easily separated into its components by simple techniques such as filtering
or decanting?
A) heterogeneous mixture
C) homogeneous mixture
E) solutions
B) compounds
D) elements
5. A separation process that depends on differing abilities of substances to form gases is called ________.
A) filtration
C) distillation
E) All of the above are correct
B) solvation
D) chromatography
6. When the following equation is balanced, the coefficient of H2 is ________.
K (s) + H2O (l) → KOH (aq) + H2 (g)
A) 1
B) 2
C) 3
D) 4
E) 5
7. A molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass. This is a statement of ________.
A) the law of multiple proportions
C) the law of conservation of mass
B) the law of constant composition D) the law of conservation of energy
8. The dissolution of Sodium Chloride can be considered as both a chemical and a physical change. Justify
Chemical CHange
Physical Change
A. Na+ and Cl- bonds are broken
H-O-H bonds are broken
B. Na+ and Cl- bonds are disrupted
Hydrogen bonds between water molecules are
broken
C. H-O-H bonds are broken
Na+ and CL- bonds are broken
D. Hydrogen bonds between water molecules
are broken
Na+ and Cl- form ion-dipole attractions to water
9. The molar mass of calcium nitrate Ca(NO3)2, rounded to one decimal place, is ________ g/mol.
A) 102.1 B) 164.0
C) 204.2
D) 150.1
E) 116.1
10. The mass % of H in methane (CH4) is ________.
A) 25.13 B) 4.032
C) 74.87
D) 92.26
E) 7.743
11. One mole of ________ contains the smallest number of atoms.
A) S8
B) C10H8
C) Al2(SO4)3
D) Na3PO4
E) NaCl
12. How many molecules of CH4 are in 48.2 g of this compound?
A) 5.00 × 1024
B) 3.00
C) 2.90 × 1025
D) 1.81 × 1024 E) 4.00
13. How many carbon atoms are there in 52.06 g of carbon dioxide?
A) 5.206 × 1024
B) 3.134 × 1025
C) 7.122 × 1023
14. Which formula/name pair is incorrect?
A) Mn(NO2)2
manganese(II) nitrite
B) Mg(NO3)2
magnesium nitrate
C) Mn(NO3)2
manganese(II) nitrate
D) 8.648 × 10-23 E) 1.424 × 1024
D) Mg3N2
magnesium nitrite
E) Mg(MnO4)2
magnesium permanganate
15. Which one of the following is the formula of hydrochloric acid?
A) HClO3 C) HClO
E) HClO2
B) HClO4 D) HCl
16. In a paper chromatography experiment, a
sample of a pigment is separated into two
components, A and B, as shown in the figure
at right. The solvent (water) is polar, and
the surface of the paper is coated with a
material that is moderately nonpolar.
What can be concluded about A and B
based on the experimental results?
A. A has a larger molar mass than B does
B. B has a larger molar mass than A does.
C. A is more polar than B.
D. B is more polar than A
.
Free Response:
You must clearly show all your work and how units cancel for ANY credit to be given
1. Acceleration due to gravity of a free-falling object is 9.8 m/s2. Express this in mm/ms2. 3 pt
A) 9.8 × 10-9
B) 9.8 × 103
C) 9.8 × 10-6
D) 9.8 × 106
E) 9.8 × 10-3
2. The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the
isotopes are given in the table below. The average atomic mass of the element is ________ amu
A. 219.7
B. 220.4
C. 220.42
D. 218.5
E. 221.0
3. A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular weight of the compound is
60.05 amu. The empirical formula is: __________The molecular formula of this compound is _____________.
CH2O
C2H4O2
14. ________-rays consist of fast-moving electrons.
A) Alpha B) Beta
C) Gamma
D) X
E) the nucleus of a He atom
15. A 30.5 gram sample of glucose C6H12O6 contains ________ mol of glucose.
A) 0.424
B) 0.169
C) 5.90
D) 2.36
E) 0.136
5. You are holding three 729 in3 spheres submerged under water. They are made out of styrofoam, wood and
lead. Which sphere would have the greatest buoyant force
A. The styrofoam sphere
C. A and B
B. The wooden sphere
D. All of the above
E. the lead sphere
21. 28. Which one of the following molecular formulas is also an empirical formula?
A) C6H6O2
B) C2H6SO
C) H2O2
D) H2P4O6
E) C6H6
23. A compound that is composed of only carbon and hydrogen contains 80.0% C and 20.0% H by mass. What
is the empirical formula of the compound?
A) C20H60
B) C7H20
C) CH3
D) C2H6
E) CH4
Propane (C3H8) reacts with oxygen in the air to produce carbon dioxide and water. In a particular experiment,
38.0 grams of carbon dioxide are produced from the reaction of 22.05 grams of propane with excess oxygen.
What is the % yield in this reaction?
A) 38.0
B) 57.6
C) 66.0
D) 86.4
E) 94.5
11. A temperature of ________ K is the same as 63 °F.
A) 17
B) 276
C) 290
D) 29
E) 336
1) When the following equation is balanced, the coefficients are ________.
C8H18 + O2 → CO2 + H2O
A) 2, 3, 4, 4
B) 1, 4, 8, 9
C) 2, 12, 8, 9
D) 4, 4, 32, 36 E) 2, 25, 16, 18
3) A combination of sand, salt, and water is an example of a ________.
A) homogeneous mixture
B) heterogeneous mixture
C) compound
D) pure substance
E) solid
Answer: B
Diff: 1
Var: 1
Page Ref: Sec. 1.2
LO: 1.2
GO: G2
4) A small amount of salt dissolved in water is an example of a ________.
A) homogeneous mixture
B) heterogeneous mixture
C) compound
D) pure substance
E) solid
Answer: A
Diff: 1
Var: 1
LO: 1.2
GO: G2
Page Ref: Sec. 1.2
39) The correct result (indicating the proper number of significant figures) of the following calculation of the
molecular mass for H2SO4 is ________.
4 × 15.9994 + 32.066 + 2 × 1.0079
A) 98.08
B) 98.079
C) 98.074
D) 98.838
E) 98.84
Answer: B
9) The gold foil experiment performed in Rutherford's lab ________.
A) confirmed the plum-pudding model of the atom
B) led to the discovery of the atomic nucleus
C) was the basis for Thomson's model of the atom
D) utilized the deflection of beta particles by gold foil
E) proved the law of multiple proportions
Answer: B
Diff: 1
Var: 1
Page Ref: Sec. 2.2
LO: 2.2
GO: G2
86) Which formula/name pair is incorrect?
A) FeSO4
iron(II) sulfate
B) Fe2(SO3)3 iron(III) sulfite
C) FeS
iron(II) sulfide
D) FeSO3
iron(II) sulfite
E) Fe2(SO4)3 iron(III) sulfide
Answer: E
Diff: 2
Var: 1
Page Ref: Sec. 2.8
LO: 2.8
GO: G2
24. Combustion of a 0.9827-g sample of a compound containing only carbon, hydrogen, and oxygen produced
1.900 g of CO2 and 1.070 g of H2O. What is the empirical formula of the compound?
A) C2H5O
B) C4H10O2
C) C4H11O2
D) C4H10O
E) C2H5O2