chem test 1 concept questions

27) Which of the following compounds has the highest boiling point? A) H2O B) HCl C) Ar D) N2

A) H2O

32) Which of the following compounds forms a covalent network solid? A) diamond B) CS2 C) Na D) N2

A) diamond

57) To make a 0.125 M solution, one could take 0.125 moles of solute and add A) enough solvent to make 1.00 L of solution. B) 1.00 kg of solvent. C) 1.00 L of solvent. D) enough solvent to make 1.00 kg of solution.

A) enough solvent to make 1.00 L of solution

122) Which of the following forms a metallic solid? A) gold B) quartz C) potassium bromide D) plastic

A) gold

65) In most liquid solutions, the component present in the larger amount is called the A) solvent. B) solute. C) dispersed medium. D) emulsifying agent

A) solvent.

6) Which of the following mixtures have components which can be separated by filtration? A) suspensions B) solutions C) colloids D) all of these

A) suspensions

8) The vapor pressure of a pure liquid increases as the A) temperature of the liquid phase increases. B) intermolecular attractive forces increase. C) average kinetic energy of the molecules in the liquid phase decreases. D) temperature of the liquid phase decreases

A) temperature of the liquid phase increases.

82) For the zeroth-order reaction: A products, what will happen to the rate of reaction if the concentration of A is tripled? A) The rate will be tripled. B) The rate will remain the same. C) The rate will be one-third. D) The rate will be higher.

B) The rate will remain the same.

11) As a liquid evaporates at a temperature below its boiling point, the temperature of the liquid A) decreases at low temperatures, but increases at high temperatures. B) decreases. C) increases. D) remains unchanged.

B) decreases.

37) For which case would ̇Hsoln be expected to be negative? A) if solvent-solvent interactions are much greater than solute-solvent and solute-solute interactions B) if solute-solvent interactions are much greater than solvent-solvent and solute-solute interactions C) if solute-solvent interactions are the same as solvent-solvent and solute-solute interactions D) if solute-solute interactions are much greater than solvent-solvent and solute-solvent interactions

B) if solute-solvent interactions are much greater than solvent-solvent and solute-solute interactions

41) Which concentration becomes smaller as the temperature is increased from 25°C to 60°C? A) mole fraction B) molarity C) mass % D) molality

B) molarity

31) Which type of bonding does sucrose form upon solidification? A) anionic B) molecular C) metallic D) amorphous

B) molecular

1) Which transition could occur if a solid is heated at a pressure above the triple point pressure? A) vaporization B) sublimation C) melting D) deposition

B) sublimation

18) Which transition could occur if a solid is heated at a pressure below the triple point pressure? A) melting B) sublimation C) deposition D) condensation

B) sublimation

15) The normal boiling point occurs when the A) temperature of the pure liquid equals the external temperature. B) vapor pressure of a pure liquid equals an external pressure of one atmosphere. C) vapor pressure of the liquid equals the external pressure. D) intermolecular forces within the liquid phase are broken.

B) vapor pressure of a pure liquid equals an external pressure of one atmosphere.

40) Although there are exceptions, which is most likely to be true for the dissolving of a solid in a liquid? A) ̇Ssoln is negative. B) ̇Ssoln is positive. C) ̇Hsoln is positive. D) ̇Hsoln is negative.

B) ̇Ssoln is positive.

103) To make a 0.125 m solution, one could take 0.125 moles of solute and add A) enough solvent to make 1.00 L of solution. B) 1.00 L of solvent. C) 1.00 kg of solvent. D) enough solvent to make 1.00 kg of solution.

C) 1.00 kg of solvent.

92) Which of the following liquids will exhibit the highest vapor pressure? A) CH3OH, bp = 64.7°C B) H2O, bp = 100°C C) Br2, bp = 58.8°C D) All exhibit the same vapor pressure

C) Br2, bp = 58.8°C

66) Two aqueous solutions, A and B, are separated by a semipermeable membrane. The osmotic pressure of solution A immediately begins to decrease. Which of the following statements is true? A) The solvent molecules are moving from the solution of higher osmotic pressure to that of lower osmotic pressure. B) The initial osmotic pressure of solution B is greater than that of solution A. C) Solvent molecules are moving from solution B into solution A. D) Both B and C are true statements.

C) Solvent molecules are moving from solution B into solution A.

90) Which of the following statements is not consistent with the properties of a molecular solid? A) a low melting solid B) a solid formed by the combination of two nonmetallic elements C) a compound that conducts electricity when molten D) a solid that is a nonconductor of electricity

C) a compound that conducts electricity when molten

29) Which of the following is an allotrope of carbon? A) coal B) glass C) diamond D) carbon monoxide

C) diamond

53) Which is not a solution? A) coffee B) hydrochloric acid C) fog D) sterling silver

C) fog

Which of the intermolecular forces is the most important contributor to the high surface tension shown by water? A) ion-dipole forces B) dispersion forces C) hydrogen bonding D) dipole-dipole forces

C) hydrogen bonding

64) One reason ionic compounds do not dissolve well in nonpolar solvents is that A) not all cations and anions have the same magnitude of charge and therefore do not form neutral ion pairs. B) ion-dipole interactions are too large for effective solvation to occur. C) ion-solvent interactions are not strong enough to solvate the ions in solution. D) there are no forces of attraction between ions and nonpolar molecules

C) ion-solvent interactions are not strong enough to solvate the ions in solution.

38) For a liquid solution made by dissolving a solid or a gas in a liquid, the A) liquid is the solute. B) solvent is the component present in the greatest amount. C) liquid is the solvent. D) solute is the component present in the greatest amount.

C) liquid is the solvent.

100) The solubility of gaseous solutes in liquid solvents is greater when the A) external pressure is decreased. B) external pressure over the solution is increased. C) partial pressure of the gas above the solution is increased. D) partial pressure of the solvent is increased.

C) partial pressure of the gas above the solution is increased.

19) The property of a liquid that measure the liquid's resistance to spread out and increase its surface area is A) dipole-dipole forces. B) heat of deposition. C) surface tension. D) sublimation point.

C) surface tension.

23) Which of the following forms a molecular solid? A) lithium chloride B) graphite C) water D) gold

C) water

62) Commercial cold packs often contain solid NH4NO3 and a pouch of water. The temperature of the pack drops as the NH4NO3 dissolves in water. Therefore, for the dissolving of NH4NO3 in water, A) ̇Hsoln is negative and ̇Ssoln may be negative or positive. B) ̇Hsoln is negative and ̇Ssoln is positive. C) ̇Hsoln is positive and ̇Ssoln is positive. D) ̇Hsoln is positive and ̇Ssoln may be negative or positive.

C) ̇Hsoln is positive and ̇Ssoln is positive.

69) Which of the following does not affect the rate of a bimolecular reaction? A) concentrations of reactants B) temperature C) presence of a catalyst D) All of these affect the rate.

D) All of these affect the rate.

26) Which is expected to have the highest surface tension at 25°? A) C8H10 B) C5H11OH C) C7H16 D) C3H5(OH)3

D) C3H5(OH)3

2) The layers of graphite are held together by A) covalent bonds. B) cationic forces. C) ion-ion forces. D) London dispersion forces

D) London dispersion forces

80) For the reaction shown below, what is the order of reaction with respect to Br ? ClO2 -(aq) + 4 Br-(aq) + 4 H+(aq) Cl-(aq) + 2 Br2(aq) +2 H2O(l) A) 1st order B) 4th order C) 2nd order D) can't tell from the information provided

D) can't tell from the information provided

95) When a liquid is heated at its boiling point, the A) temperature of the liquid decreases. B) ionic bonds are broken, allowing sublimation to occur. C) temperature of the vapor phase decreases. D) temperature of the liquid remains the same as long as any liquid is present.

D) temperature of the liquid remains the same as long as any liquid is present.