MCA Quarter 3 Multiple Choice Review
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____1.What SI unit is used to measure the number of representative particles in a substance?
a. / kilogram / c. / kelvinb. / ampere / d. / mole
____2.Which of the following elements exists as a diatomic molecule?
a. / neon / c. / nitrogenb. / lithium / d. / sulfur
____3.Avogadro's number of representative particles is equal to one ____.
a. / kilogram / c. / kelvinb. / gram / d. / mole
____4.How many moles of tungsten atoms are in 4.8 10 atoms of tungsten?
a. / 8.0 10 moles / c. / 1.3 10 molesb. / 8.0 10 moles / d. / 1.3 10 moles
____5.How many atoms are in 3.5 moles of arsenic atoms?
a. / 5.8 10 atoms / c. / 2.1 10atomsb. / 7.5 10 atoms / d. / 1.7 10 atoms
____6.Butanol is composed of carbon, hydrogen, and oxygen. If 1.0 mol of butanol contains 6.0 10 atoms of hydrogen, what is the subscript for the hydrogen atom in CHO?
a. / 1 / c. / 6b. / 10 / d. / 8
____7.The atomic masses of any two elements contain the same number of ____.
a. / atoms / c. / ionsb. / grams / d. / milliliters
____8.What is true about the molar mass of chlorine gas?
a. / The molar mass is 35.5 g.b. / The molar mass is 71.0 g.
c. / The molar mass is equal to the mass of one mole of chlorine atoms.
d. / none of the above
____9.The mass of a mole of NaCl is the ____.
a. / molar mass / c. / molecular massb. / atomic mass / d. / gram atomic mass
____10.What is the molar mass of AuCl3?
a. / 96 g / c. / 232.5 gb. / 130 g / d. / 303.6 g
____11.The molar mass of CH and the molar mass of CaCO contain approximately the same number of ____.
a. / carbon atoms / c. / cationsb. / anions / d. / grams
____12.For which of the following conversions does the value of the conversion factor depend upon the formula of the substance?
a. / volume of gas (STP) to molesb. / density of gas (STP) to molar mass
c. / mass of any substance to moles
d. / moles of any substance to number of particles
____13.The volume of one mole of a substance is 22.4 L at STP for all ____.
a. / gases / c. / solidsb. / liquids / d. / compounds
____14.The molar volume of a gas at STP occupies ____.
a. / 22.4 L / c. / 1 kilopascalb. / 0C / d. / 12 grams
____15.The molar mass of a substance can be calculated from its density alone, if that substance is a(n) ____.
a. / element / c. / liquidb. / gas at STP / d. / solid
____16.The molar mass of a gas can be determined from which of the following?
a. / the density of the gas at STP / c. / Avogadro's numberb. / the volume of a mole of the gas / d. / none of the above
____17.What is the number of moles in 500 L of He gas at STP?
a. / 0.05 mol / c. / 22 molb. / 0.2 mol / d. / 90 mol
____18.To determine the formula of a new substance, one of the first steps is to find the ____.
a. / molar mass / c. / volume at STPb. / percent composition / d. / number of particles per mole
____19.What information is needed to calculate the percent composition of a compound?
a. / the weight of the sample to be analyzed and its densityb. / the weight of the sample to be analyzed and its molar volume
c. / the formula of the compound and the atomic mass of its elements
d. / the formula of the compound and its density
____20.What is the percent by mass of carbon in acetone, CHO?
a. / 20.7% / c. / 1.61%b. / 62.1% / d. / 30.0%
____21.The lowest whole-number ratio of the elements in a compound is called the ____.
a. / empirical formula / c. / binary formulab. / molecular formula / d. / representative formula
____22.Chemical reactions ____.
a. / occur only in living organisms / c. / only occur outside living organismsb. / create and destroy atoms / d. / produce new substances
____23.Everyday equations describe ____.
a. / thermonuclear reactions / c. / chemical reactionsb. / everyday processes / d. / biological chemistry
____24.What does the symbol in a chemical equation mean?
a. / Heat is supplied to the reaction. / c. / yieldsb. / A catalyst is needed. / d. / precipitate
____25.Chemical equations ____.
a. / describe chemical reactionsb. / show how to write chemical formulas
c. / give directions for naming chemical compounds
d. / describe only biological changes
____26.Symbols used in equations, together with the explanations of the symbols, are shown below. Which set is correct?
a. / (g), grams / c. / (aq), dissolved in waterb. / (l), liters / d. / s, solid product
____27.This symbol () indicates that ____.
a. / heat must be appliedb. / an incomplete combustion reaction has occurred
c. / a gas is formed by the reaction
d. / the reaction is reversible
____28.A catalyst is ____.
a. / the product of a combustion reactionb. / not used up in a reaction
c. / one of the reactants in single-replacement reactions
d. / a solid product of a reaction
____29.What are the coefficients that will balance the skeleton equation below?
AlCl + NaOH Al(OH) NaCl
a. / 1, 3, 1, 3 / c. / 1, 1, 1, 3b. / 3, 1, 3, 1 / d. / 1, 3, 3, 1
____30.Chemical equations must be balanced to satisfy ____.
a. / the law of definite proportions / c. / the law of conservation of massb. / the law of multiple proportions / d. / Avogadro’s principle
____31.In every balanced chemical equation, each side of the equation has the same number of ____.
a. / atoms of each element / c. / molesb. / molecules / d. / coefficients
____32.In order to predict whether or not a single-replacement reaction takes place, you need to consult a chart that shows the ____.
a. / periodic tableb. / activity series of metals
c. / common polyatomic ions
d. / ionic charges of representative elements
____33.In a combustion reaction, one of the reactants is ____.
a. / hydrogen / c. / oxygenb. / nitrogen / d. / a metal
____34.The type of reaction that takes place when one element reacts with a compound to form a new compound and a different element is a ____.
a. / combination reaction / c. / single-replacement reactionb. / decomposition reaction / d. / double-replacement reaction
____35.In a double-replacement reaction, the ____.
a. / products are always molecularb. / reactants are two ionic compounds
c. / reactants are two elements
d. / products are a new element and a new compound
____36.Which of the following statements is true about single-replacement reactions?
a. / They are restricted to metals. / c. / Two reactants produce two products.b. / They involve a single product. / d. / Any metal replaces any other metal.
____37.In the activity series of metals, which metal(s) will displace hydrogen from an acid?
a. / only metals above hydrogen / c. / any metalb. / only metals below hydrogen / d. / only metals from Li to Na
____38.In a double-replacement reaction, ____.
a. / the reactants are usually a metal and a nonmetalb. / one of the reactants is often water
c. / the reactants are generally two ionic compounds in aqueous solution
d. / energy in the form of heat or light is often produced
____39.The calculation of quantities in chemical equations is called ____.
a. / stoichiometry / c. / percent compositionb. / dimensional analysis / d. / percent yield
____40.What is conserved in the reaction shown below?
H(g) + Cl(g) 2HCl(g)
a. / mass only / c. / mass, moles, and molecules onlyb. / mass and moles only / d. / mass, moles, molecules, and volume
____41.What is conserved in the reaction shown below?
N(g) + 3F(g) 2NF(g)
a. / atoms only / c. / mass and atoms onlyb. / mass only / d. / moles only
____42.In every chemical reaction, ____.
a. / mass and molecules are conserved / c. / mass and atoms are conservedb. / moles and liters are conserved / d. / moles and molecules are conserved
____43.In a chemical reaction, the mass of the products ____.
a. / is less than the mass of the reactantsb. / is greater than the mass of the reactants
c. / is equal to the mass of the reactants
d. / has no relationship to the mass of the reactants
____44.In any chemical reaction, the quantities that are preserved are ____.
a. / the number of moles and the volumesb. / the number of molecules and the volumes
c. / mass and number of atoms
d. / mass and moles
____45.The first step in most stoichiometry problems is to ____.
a. / add the coefficients of the reagents / c. / convert given quantities to volumesb. / convert given quantities to moles / d. / convert given quantities to masses
____46.Which type of stoichiometric calculation does not require the use of the molar mass?
a. / mass-mass problems / c. / mass-particle problemsb. / mass-volume problems / d. / volume-volume problems
____47.When two substances react to form products, the reactant which is used up is called the ____.
a. / determining reagent / c. / excess reagentb. / limiting reagent / d. / catalytic reagent
____48.When an equation is used to calculate the amount of product that will form during a reaction, then the value obtained is called the ____.
a. / actual yield / c. / theoretical yieldb. / percent yield / d. / minimum yield
MULTIPLE CHOICE
MCA Quarter 3 Multiple Choice Review
Answer Section
MULTIPLE CHOICE
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