Gen Chem 1 - Set 2

Which of these compounds is most likely to be ionic? Select one: a. KF b. CCl4 c. CS2 d. CO2 e. ICl

a. KF

What is the term used for findings that are summarized based on a pattern or trend? Select one: a. Law b. Hypothesis c. Theory d. Phenomena e. Prediction

a. Law

Which one of these represents a physical change? Select one: a. Water, when heated, forms steam. b. Bleach turns hair yellow. c. Sugar, when heated, becomes brown. d. Milk turns sour. e. Apples, when exposed to air, turn brown.

a. Water, when heated, forms steam.

Which of the following is a type of radioactive radiation that consists of positively charged particles and is deflected away from the positively charged plate? Select one: a. α rays b. β rays c. γ rays d. δ rays e. ε rays

a. α rays

How many moles of ammonia, NH3, are in 13.81 g of NH3? Select one: a. 1.234 moles b. 0.8107 moles c. 8.316 × 1024 moles d. 4.881 × 1023 moles e. 235.3 moles

b. 0.8107 moles

When octane (C8H18) is burned in a particular internal combustion engine, the yield of products (carbon dioxide and water) is 93%. What mass of carbon dioxide will be produced in this engine when 15.0 g of octane is burned with 15.0 g of oxygen gas? Select one: a. 13 g b. 12 g c. 21 g d. 54 g e. 43 g

b. 12 g

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate? Select one: a. 4.00 × 102 g b. 25.0 g c. 17.0 g d. 4.00 × 10-2 g e. 2.50 × 10-3 g

b. 25.0 g

What mass of Cr can be produced by the reaction of 44.1 g of Cr2O3 with 35.0 g of Al according to the following chemical equation? 2Al + Cr2O3 → Al2O3 + 2Cr Select one: a. 15.1 g b. 30.2 g c. 67.4 g d. 99.9g e. 104 g

b. 30.2 g

Aluminum reacts with bromine to form aluminum bromide (used as an acid catalyst in organic synthesis).Al(s) + Br2(l) → Al2Br6(s) [unbalanced]How many moles of Al are needed to form 2.43 mol of Al2Br6? Select one: a. 7.29 mol b. 4.86 mol c. 2.43 mol d. 1.62 mol e. 1.22 mol

b. 4.86 mol

Which of the following is a nonmetal? Select one: a. Lithium, Li, Z = 3 b. Bromine, Br, Z = 35 c. Mercury, Hg, Z = 80 d. Bismuth, Bi, Z = 83 e. Sodium, Na, Z = 11

b. Bromine, Br, Z = 35

Which one of these represents a chemical change? Select one: a. Boiling water to form steam b. Turning hair yellow with bleach c. Melting butter d. Mixing powdered charcoal and oxygen at room temperature e. Cutting a bar of sodium metal into pieces with a knife

b. Turning hair yellow with bleach

Give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine-37. Select one: a. 37 p, 37 e, 17 n b. 17 p, 17 e, 37 n c. 17 p, 17 e, 20 n d. 37 p, 17 e, 20 n e. 17 p, 37 e, 17 n

c. 17 p, 17 e, 20 n

Which of the following is an extensive property? Select one: a. Density b. Temperature c. Mass d. Specific Heat e. Pressure

c. Mass

Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3. Select one: a. 2.377 mol b. 2.146 mol c. 1.105 mol d. 0.4660 mol e. 0.4207 mol

d. 0.4660 mol

How many significant figures does the sum 8.5201 + 1.93 contain? Select one: a. 1 b. 2 c. 3 d. 4 e. 5

d. 4

Phosphine, an extremely poisonous and highly reactive gas, reacts with oxygen gas to form tetraphosphorus decaoxide and water. PH3(g) + O2(g) → P4O10(s) + H2O(g) [unbalanced] Calculate the mass of P4O10(s) formed when 225 g of PH3 reacts with excess oxygen. Select one: a. 1880 g b. 940. g c. 900. g d. 470. g e. 56.3 g

d. 470. g

Which of the following is a molecular formula for a compound with an empirical formula of CH? Select one: a. C2H6 b. C3H9 c. C4H10 d. C6H6 e. None of the answers is correct.

d. C6H6 (?)

Polyatomic molecules contain: Select one: a. two different types of atoms. b. two of the same types of atoms. c. only two atoms of the same or different type. d. more than two atoms of the same or different type.

d. more than two atoms of the same or different type.

Phosphorus pentachloride, a white solid that has a pungent, unpleasant odor, is used as a catalyst for certain organic reactions. Calculate the number of moles in 38.7 g of phosphorus pentachloride. Select one: a. 5.38 mol b. 3.55 mol c. 0.583 mol d. 0.282 mol e. 0.186 mol

e. 0.186 mol

A dose of medication was prescribed to be 35 microliters. Which of the following expresses that volume in centiliters? Select one: a. 3.5 × 105 cL b. 3.5 × 104 cL c. 3.5 cL d. 3.5 × 10-4 cL e. 3.5 × 10-3 cL

e. 3.5 × 10-3 cL

What terms defines a mass which is exactly equal to 1/12 the mass of one carbon-12 atom? Select one: a. Isotope number b. Mass number c. Mass-to-charge ratio d. Atomic number e. Atomic mass unit

e. Atomic mass unit

Which of these elements is most likely to be a good conductor of electricity? Select one: a. N b. S c. He d. Cl e. Fe

e. Fe

Ferric oxide is used as a pigment in metal polishing. Which of the following is its formula? Select one: a. FeO b. Fe2O c. FeO3 d. Fe2O5 e. Fe2O3

e. Fe2O3

Which of the following activities is not a part of good science? Select one: a. Proposing a theory b. Developing a hypothesis c. Making quantitative observations d. Designing experiments e. Indulging in speculation

e. Indulging in speculation

Which of these quantities represents the largest mass? Select one: a. 2.0 × 102 mg b. 0.0010 kg c. 1.0 × 105 μg d. 2.0 × 102 cg e. 10.0 dg

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