1051-1st Chem Exam_1051026(A)
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1)The width, length, and height of a large, custom-made shipping crate are 1.20 m, 2.12 m, and 0.54 m, respectively. The volume of the box using the correct number of significant figures is __________ m3.
A) 1.4 B) 1.37 C) 1.3738 D) 1.37376 E) 1.374
Answer: A
2) In the following list, only __________ is not an example of a chemical reaction.
A) a burning candle B) the rusting of iron
C) the condensation of water vapor D) dissolution of a penny in nitric acid
E) the formation of polyethylene from ethylene Answer: C
3) The temperature of -25 °C is __________ in Kelvins.
A) 103 B) 248 C) 166 D) 138 E) 298
Answer: B
4) Of the following, only __________ is an extensive property.
A) freezing point B) density C) mass
D) boiling point E) temperature Answer: C
5) Accuracy refers to __________.
A) how close a measured number is to other measured numbers B) how close a measured number is to infinity
C) how close a measured number is to the calculated value D) how close a measured number is to zero
E) how close a measured number is to the true value Answer: E
6) How many significant figures are in the measurement 5.34 g?
A) 1 B) 4 C) 3 D) 2 E) 5
Answer: C
7) The law of constant composition says __________.
A) that all substances have the same composition
B) that the composition of a heterogeneous mixture is always the same C) that the composition of an element is always the same
D) that the composition of a compound is always the same
E) that the composition of a homogeneous mixture is always the same Answer: D
8) Which one of the following is the highest temperature?
A) The boiling point of water B) 373 K
C) 220 °F D) 100°C
E) All of the above are identical temperatures Answer: C
9) The density of silver is 10.5 g/cm3. A piece of silver that occupies a volume of 63.1 cm3 would have a mass of __________ g.
A) .445 B) 112 C) 663 D) 23.6 E) 2.25
Answer: C
10) Which species is an isotope of 39Cl?
A) 34S2- B) 39Ar C) 40Ar+ D) 36Cl- E) 80Br
Answer: D
11) Which pair of elements below should be the most similar in chemical properties?
A) K and Kr B) I and Br C) B and As D) C and O E) Cs and He
Answer: B
12) The gold foil experiment performed in Rutherford's lab __________.
A) led to the discovery of the atomic nucleus B) confirmed the plum-pudding model of the atom 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: A
13) The formula for the compound formed between aluminum ions and phosphate ions is __________.
A) AlP B)Al2(PO4)3 C)Al(PO4)3 D)Al3(PO4)3 E)AlPO4
Answer: E
14) Formulas that show how atoms are attached in a molecule are called __________.
A) molecular formulas B) structural formulas C) empirical formulas D) ionic formulas
E) diatomic formulas Answer: B
15) In the symbol below, X = __________.
13 6 X A) KB) C D) AlC) N
16)The correct name for MgF2 is __________.
A) magnesium difluoride B) manganese bifluoride C) manganese difluoride D) monomagnesium difluoride
E) magnesium fluoride Answer: E
17) 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.
Isotope Abundance Mass
221X 74.22 220.9
220X 12.78 220.0
218X 13.00 218.1
A) 221.0 B) 220.42 C) 218.5 D) 220.4 E) 219.7
Answer: D
18) Which formula/name pair is incorrect?
A)Mn(NO3)2 manganese(II) nitrate B)Mg3N2 magnesium nitrite
C)Mg(MnO4)2 magnesium permanganate D)Mg(NO3)2 magnesium nitrate
E)Mn(NO2)2 manganese(II) nitrite Answer: B
19) Which species has 48 electrons?
A) 11850 Sn+2 B) 11248 Cd+2 C) 6831Ga D) 11650 Sn+4 E) 4822Ti Answer: A
20) The molecular formula of a compound is always __________ the empirical formula.
A) simpler than
B) an integral multiple of C) the same as
D) more complex than E) different from Answer: B
21) When the following equation is balanced, the coefficients are __________.
C8H18 + O2 CO2 + H2O
A) 2, 12, 8, 9 B) 1, 4, 8, 9 C) 4, 4, 32, 36 D) 2, 3, 4, 4 E) 2, 25, 16, 18 Answer: E
22) Lithium and nitrogen react to produce lithium nitride:
6Li (s) + N2 (g) 2Li3N (s)
How many moles of lithium nitride are produced when 0.400 mol of lithium react in this fashion?
A) 0.0667 B) 0.133 C) 0.800 D) 1.20 E) 0.200
Answer: B
23) Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements:
2NaN3 (s) 2Na (s) + 3N2 (g)
How many moles of N2 are produced by the decomposition of 3.55 mol of sodium azide?
A) 2.37 B) 1.78 C) 5.33 D) 1.18 E) 10.7
Answer: C
24) 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) 66.0 B) 94.5 C) 57.6 D) 38.0 E) 86.4
Answer: C
25) A 17.6-g sample of ammonium carbonate contains __________ mol of ammonium ions.
A) 3.47 B) 0.176 C) 2.14 D) 0.183 E) 0.366
Answer: E
26)A sample of CH4O with a mass of 32.0 g contains __________ molecules of CH4O.
A) 1.00 B) 32.0 C) 5.32 × 10-23 D) 1.88 × 1022 E) 6.02 × 1023
Answer: E
27) Calcium carbide (CaC2) reacts with water to produce acetylene (C2H2):
CaC2 (s) + 2H2O (g) Ca(OH)2 (s) + C2H2 (g)
Production of 3.3 g of C2H2 requires consumption of __________ g of H2O.
A) 1.2 B) 4.6 C) 480 D) 0.048 E) 2.3
Answer: B
28) Which of the following are decomposition reactions?
1) CH4 (g) + O2 (g) CO2 (g) + H2O (l) 2) CaO (s) + CO2 (g) CaCO3 (s) 3) Mg (s) + O2 (g) MgO (s) 4) PbCO3 (s) PbO (s) + CO2 (g)
A) 2, 3, and 4 B) 4 only C) 2 and 3 D) 1, 2, and 3 E) 1, 2, 3, and 4 Answer: B
29) One mole of __________ contains the smallest number of atoms.
A)Na3PO4 B)C10H8 C) NaCl D)Al2(SO4)3 E)S8
Answer: C
30) A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be __________.
A)N2O B)N2O4 C) NO D)NO2
E)either NO2 or N2O4 Answer: A
31) What volume (mL) of 0.135 M NaOH is required to neutralize 13.7 mL of 0.129 M HCl?
A) 14.3 B) 0.24 C) 6.55 D) 0.076 E) 13.1
Answer: E
32) Which one of the following compounds is insoluble in water?
A)K2SO4 B)Fe(NO3)3 C)Na2CO3 D) ZnS E)AgNO3
Answer: D
33)A stock solution of HNO3 is prepared and found to contain 13.5 M of HNO3. If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L, the concentration of the diluted solution is __________ M.
A) 270 B) 1.48 C) 0.675 D) 0.270 E) 675
Answer: C
34) The net ionic equation for the reaction between aqueous sulfuric acid and aqueous sodium hydroxide is __________.
A) H+ (aq) + HSO4- (aq) + 2Na+ (aq) + 2OH- (aq) 2H2O (l) + 2Na+ (aq) + SO42- (aq) B) SO42- (aq) + 2Na+ (aq) 2Na+ (aq) + SO42- (aq)
C) H+ (aq) + OH- (aq) H2O( l)
D) H+ (aq) + HSO4- (aq) + 2OH- (aq) 2H2O (l) + SO42- (aq)
E) 2H+ (aq) + SO42- (aq) + 2Na+ (aq) + 2OH- (aq) 2H2O (l) + 2Na+ (aq) + SO42- (aq) Answer: C
35) Oxidation is the __________ and reduction is the __________.
A) loss of electrons, gain of electrons B) loss of oxygen, gain of electrons C) gain of oxygen, loss of electrons D) gain of oxygen, loss of mass
E) gain of electrons, loss of electrons Answer: A
36) Which of the following is an oxidation-reduction reaction?
A)AgNO3 (aq) + HCl (aq) AgCl (s) + HNO3 (aq) B)HCl (aq) + NaOH (aq) H2O (l) + NaCl (aq)
C) H2CO3 (aq) + Ca(NO3)2 (aq) 2HNO3 (aq) + CaCO3 (s) D)Cu (s) + 2AgNO3 (aq) 2Ag (s) + Cu(NO3)2 (aq)
E)Ba(C2H3O2)2 (aq) + Na2SO4 (aq) BaSO4 (s) + 2NaC2H3O2 (aq) Answer: D
37) The reaction between strontium hydroxide and chloric acid produces __________.
A) two molecular compounds B) two weak electrolytes
C) a molecular compound and a weak electrolyte D) a molecular compound and a strong electrolyte
E) two strong electrolytes Answer: D
38)The balanced molecular equation for complete neutralization of H2SO4 by KOH in aqueous solution is __________.
A)H2SO4 (aq) + 2KOH (aq) 2H2O (l) + K2SO4 (s) B)H2SO4 (aq) + 2KOH (aq) 2H2O (l) + K2SO4 (aq) C) 2H+ (aq) + 2OH- (aq) 2H2O (l)
D) H2SO4 (aq) + 2OH- (aq) 2H2O (l) + SO42- (aq) E) 2H+ (aq) + 2KOH (aq) 2H2O (l) + 2K+ (aq) Answer: B
39) Which of the following are weak acids?
A) HI, HF B) HF
C)HI, HNO3, HBr D) HF, HBr
E) none of the above Answer: B
40) A solution is prepared by mixing 50.0 mL of 0.100 M HCl and 10.0 mL of 0.200 M NaCl. What is the molarity of chloride ion in this solution?
A) 8.57 B) 3.50 C) 0.183 D) 0.117 E) 0.0500
Answer: D
