Regular Chemistry Final (Ch: 8, 9, 10 & 11 Tests and Ch 12 quiz)

to balance a chemical equation, it may be necessary to adjust the a. coefficients b. subscripts c. formulas of the products d. number of products

a

what determines the average kinetic energy of the molecule of any gas a. temperature b. pressure c. container volume d. molar mass

a

what is the number of moles of H2 produced when 23 g of sodium react with water according to the equation 2Na(s) + 2H2O(l) --> 2NaOH(aq) + H2(g) a. .50 mol b. 1.0 mol c. 2.0 mol d. 4.0 mol

a

what is the study of the mass relationships among reactants and products in a chemical reaction a. reaction stoichiometry b. composition stoichiometry c. electron configuration d. periodic law

a

when a solid produced by a chemical reaction separates from the solution it is called a. precipitate b. a reactant c. a molecule d. the mass of the product

a

which best describes the particles of a liquid compared to those of a gas a. less random b. lower in density c. colder d. higher in energy

a

which is an example of effusion a. air escaping slowly from a pinhole in a tire b. the aroma of a cooling pie spreading across a room c. helium dispersing into a room after a ballon pops d. oxygen and gasoline fumes mixing in an automobile carburetor

a

which is a textbook example of gas diffusion a. air escaping slowly from a pinhole in a tire b. the odor of perfume spreading throughout a room c. a cylinder of oxygen stored under high pressure d. all of the above

b

which mixture can be separated by filtration? a. mayonnaise b. muddy water c. shaving cream d. gelatin

b

which mixture exhibits the Tyndall effect a. solvent b. colloid c. suspension d. solute

b

which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen a. carbon plus oxygen yields carbon dioxide b. C + O2 --> CO2 c. CO2 --> C + O2 d. 2C + O --> CO2

b

which of the following solutions does not contain an electrolyte a. potassium bromide water solution b. sugar-water solution c. hydrochloric acid solution d. sodium chloride water solution

b

which term best describes the process by which particles escape from the surface of a nonboiling liquid and enter the gas state a. sublimation b. evaporation c. surface tension d. aeration

b

why doesn't water in lakes and ponds of temperate climates freeze solid during the winter and kill nearly all the living things it contains a. water is colorless b. ice floats c. the molar enthalpy of fusion of ice is relatively low d. water sinks as it freezes

b

a heterogenous mixture that has large particles that settle out is called a a. solvent b. colloid c. suspension d. solute

c

equal volumes of diatomic gases under the same conditions of temperature and pressure contain the same number of a. protons b. ions c. molecules d. electrons

c

for the reaction represented by the equation 2H2 + O2 --> 2H2O, how many moles of water can be produced from 6.0 mol of oxygen a. 2.0 mol b. 6.0 mol c. 12 mol d. 18 mol

c

if force is held constant as surface area decreases, pressure a. remains constant b. decreases c. increases d. increases or decreases, depending on the volume change

c

if the amount of dissolved solute in a solution at given temperature is greater than the amount that can permanently remain in solution at that temperature, the solution is said to be a. saturated b. unsaturated c. supersaturated d. diluted

c

in an equation, the symbol for a substance in water solution is followed by a. (l) b. (g) c. (aq) d. (s)

c

in writing a chem equation that produces hydrogen gas, the correct representation of hydrogen gas is a. H b. 2H c. H2 d. OH

c

standard temperature is exactly a. 100 C b. 273 C c. 0 C d. 0 K

c

which of the following actions odes not, in general, increase the speed of the dissolving process of a solid in a liquid a. increasing the temperature of the solvent b. increasing the surface area of the solute c. increasing the pressure of the solution d. shaking or stirring the solution

c

why could the pressure of a sample of gas at a constant volume fall 75 mm Hg a. the container exploded b. the temperature increased c. the temperature decreased d. the volume increased

c

glycerol boils at a slightly higher temperature than water. this reveals that glycerol's attractive forces are a. nonexistent b. weaker than those of water c. the same as those of water d. stronger than those of water

d

how many grams of CaCl2 (molar mass = 110.98 g/mol) are needed to prepare 1.00 L of a 1.00 M solution? a. 1.00 g b. 40.08 g c. 75.53 g d. 110.98 g

d

if V, P, and T represented the original volume, pressure, and temperature in the correct units, and V1, P1, and T1 represent the new conditions, what is the combined gas law a. PV/T = P1V1/T b. PV^1/T = P1V/T c. P1V/T = PV1/T d. PV/T = P1V1/T1

d

in general, most substances are a. least dense in the liquid state b. more dense as gases than as solids c. less dense as solids than as liquids d. most dense in the solid state

d

in the equation 2KClO3 --> 3O2, how many moles of oxygen are produced when 3.0 mol of KClO3 decompose completely a. 1.0 mol b. 2.5 mol c. 3.0 mol d. 4.5 mol

d

the mass of one mole of a substance is defined as its a. valence b. activity c. mole ratio d. molar mass

d

the reactant that is used up completely in a chemical reaction is referred to as the _____________ reactant while the reactant that is left over is known as the ____________ reactant a. excess, limiting b. primary, secondary c. secondary, primary d. limiting, excess

d

what is the measured amount of product obtained from a chemical reaction a. mole ratio b. percentage yield c. theoretical yield d. actual yield

d

what is the small whole number that appears in front of a formula in chem equation a. a subscript b. a superscript c. a ratio d. a coefficient

d

when does the concentration of a vapor decrease a. when the rate of evaporation increases b. when the temperature remains constant c. when the liquid phase is warmed d. when the rate of condensation exceeds the rate of evaporation

d

when the equation Fe3O4 + Al --> Al2O3 + Fe is correctly balanced, what is the coefficient of Fe? a. 3 b. 4 c. 6 d. 9

d

which equation is not balanced a. 2H2 + O2 --> 2H20 b. 4H2 + 2O2 --> 4H2O c. H2 + H2 + O2 --> H2O d. 2H2 + O2 --> H2O

d

which observation does NOT indicate that a chem reaction has occurred a. formation of a precipitate b. production of a gas c. evolution of heat and light d. change in total mass of substances

d

who developed the concept that the total pressure of a mixture of gases is the sum of their partial pressure a. charles b. boyle c. kelvin d. dalton

d

a pressure of 769 mm Hg equals a. 769 atm b. 1 atm c. 1 torr d. 769 torr

d

In a chem reaction a. the mass of the reactants equals the mass of the products b. the mass of the products is greater than the mass of the reactants c. the number of atoms in the reactants and products must change d. energy as heat must be added to the reactants

a

What is the value of the gas constant? a. 0.0821 L x atm / mol x K b. 0.281 L x atm c. 0.0281 L x atm / mol x K d. 0.0821 mol x K

a

When the size of the particles in a solution and in a colloid are compared, the particle size in the solution is a. smaller b. larger c. the same size as the particle size in the colloid d. either smaller or larger, depending on the colloid, and the solution

a

a balanced chemical equation allows one to determine the a. mole ratio of any two substances in the reaction b. energy released in the reaction c. electron configuration of all elements in the reaction d. mechanism involved in the reaction

a

a solution that contains the maximum amount of dissolved solute at a particular temperature is said to be a. saturated b. unsaturated c. supersaturated d. diluted

a

a substance that is not soluble in a polar solvent is most likely a. nonpolar b. ionic c. polar d. hydrogen bonded

a

according to the kinetic-molecular theory, particles of matter a. are in constant motion b. have different shapes c. have different colors d. are always fluid

a

in the chemical equation 2AlCl3(aq) + 3Pb(NO3)2(aq) --> 3PbCl2(s) + 2Al(NO3)3(aq) the state of PbCl2 is a(n) ________________ a. solid b. liquid c. gas d. aqueous

a

in what kind of reaction does a single compound produce two or more simpler substances? a. decomposition reaction b. synthesis reaction c. single-displacement reaction d. ionic reaction

a

the combined gas law is equivalent to Charles's law when a. the pressure is constant b. the temperature is constant c. the volume is constant d. the volume equals 22.4 L

a

the reaction represented by the equation Pb(NO3)2(aq) + 2KI(aq) --> PbI2(s) + 2KNO3(aq) is a a. double-displacement reaction b. synthesis reaction c. decomposition reaction d. combustion reaction

a

to balance a chem equation, it may be necessary to adjust the a. coefficients b. subscripts c. formulas of the products d. number of products

a

a chemical reaction involving substances A and B stops when B is completely used. B is the a. excess reactant b. limiting reactant c. primary reactant d. primary product

b

a mixture of four gases exerts a total pressure of 860 mm Hg. Gases A and B each exert 220 mm Hg. Gas C exerts 110 mm Hg. What pressure is exerted by gas D a. 165 mm Hg b. 310 mm Hg c. 860 mm Hg d. 220 mm Hg

b

a volatile liquid a. has strong attractive forces between particles b. evaporates readily c. has no odor d. is ionic

b

at the triple point, water can a. have only three pressure values b. exist in equilibrium in three different phases c. only be present as vapor d. exist only as a solid

b

if the percentage yield is equal to 100%, then a. the actual yield is greater than the theoretical yield b. the actual yield is equal to the theoretical yield c. the actual yield is less than the theoretical yield d. there was no limiting reactant

b

in the reaction represented by the equation N2 + 3H2 --> 2NH3, what is the mole ratio of nitrogen to ammonia a. 1:1 b. 1:2 c. 1:3 d. 2:3

b

in the reaction represented by the equation N2(g) + 2O2(g) --> 2NO2(g), what is the volume ration of N2 to NO2 a. 1:1 b. 1:2 c. 2:1 d. 2:5

b

pressure is the force per unit a. volume b. surface area c. length d. depth

b

the coefficients in a chemical equation represent the a. masses, in grams, of all reactants and products b. relative numbers of moles of reactants and products c. number of atoms in each compound in a reaction d. number of valence electrons involved in the reaction

b

the conversion from the mass of a reactant to the mass of a product involved ________ step(s) a. 2 b. 3 c. 5 d. 4

b

the efficiency of a reaction is described by the ________ yield a. actual b. percent c. zero d. excess

b

the reaction represented by the equation 2HgO(s) --> 2Hg(l) + O2(g) is classified as a(n) ___________ reaction a. single replacement b. decomposition c. double replacement d. combustion

b

what is the ratio of the actual yield to the theoretical yield, multiplied by 100% a. mole ratio b. percentage yield c. avogadro yield d. excess yield

b

which coefficients correctly balance the formula equation H4(NO)2(s) --> N2(g) + H20(l) a. 1,2,2 b. 1,1,2 c. 2,1,1 d. 2,2,2

b