What is the concentration, in mass percent, of a solution prepared from 5.00 g cooper(II) sulfate penta hydrate (CuSO4 *5H2O) and 15.0 g of water?

A) 0.250%

B) 40.0%

C) 25.0%

D) 3.00%

E) 33.3% 

At STP, what is the volume of 4.50 moles of methane gas?

A) 3420 L

B) 167 L

C) 1230 L

D) 60.7 L

E) 101 L 

PCl5 (g)  PCl3 (g)+ Cl2 (g) For the above reaction at equilibrium, if the volume of the container is increased, the amount of PCl5 present will

A) stay the same.

B) increase.

C) double.

D) triple.

E) decrease. 

What is the conjugate acid of HCO3 ?

A) H2O

B) H2CO3

C) CO3 2-

D) H3O+

E) OH

Which one of the following is characteristic of a base?

A) turns blue litmus paper red

B) has a slippery, soapy feel

C) is insoluble in water

D) produces hydronium ions (H3O+) in water

E) has a sour taste

During the process of diluting a solution to a lower concentration,

A) the amount of solvent does not change.

B) the amount of solute does not change.

C) there is more solute in the concentrated solution.

D) the volume of the solution does not change.

E) water is removed from the concentrated solution.

A solution with the same osmotic pressure as the blood is

A) nontonic to the blood.

B) hypotonic to the blood.

C) molar to the blood.

D) hypertonic to the blood.

E) isotonic to the blood. 

 A chemical reaction that can proceed in either the forward or the reverse direction as written is called a __________ reaction. For example 2 HI(g) H2(g) + I2(g).

A) reversible

B) miniscule

C) solid phase

D) microscopic

E) favored 

In a catalyzed chemical reaction, one function of a catalyst is to

A) increase the temperature at which the reaction is carried out.

B) change the equilibrium concentrations of the products and reactants.

C) increase the energy given off during the reaction.

D) increase the activation energy.

E) increase the number of successful reactant collisions. 

The activation energy of a chemical reaction is the energy that

A) activates the catalyst.

B) initiates the reaction.

C) is the difference in the energies of the starting materials and products.

D) must be released from the mixture.

E) must be removed from the mixture

What is the molarity of a solution that contains 34.0 g of NH3 (17 .0g/mol) in 1.00 L of solution?

A) 2.0 M

B) 1.0 M

C) 0.029 M

D) 34 M

E) 0.50 M 

According to the Arrhenius concept of Acids and Bases, if NaOH were dissolved in water, it would act as

A) an acid.

B) a base.

C) a source of hydronium ions.

D) a proton donor.

E) a source of H- ions.

The commercial sold rubbing alcohol is 70.% isopropyl alcohol by volume. How many mL of isopropyl alcohol are in a 473 mL (1 pint) container?

A) 0.15 mL

B) 331 mL

C) 470 mL

D) 680 mL

E) 70. mL 

How many grams of NO (30.0 g/mol) are required to produce 14.5 g of N2 (28.0 g/mol) in the following reaction? 4NH3(g) + 6NO(g) 5N2(g) + 6H2O(l)

A) 12.9 g

B) 15.5 g

C) 14.5 g

D) 18.6 g

E) 12.5 g

Refrigerating perishable foods controls biochemical reactions by

A) catalyzing the removal of harmful chemicals from the foods. B) removing bacteria.

C) decreasing the rate of reactions affecting spoilage.

D) improving the appearance of the foods.

E) increasing concentrations of antioxidants

 In the following gas phase reaction, what is the effect of adding more NO2 to the starting reaction mixture? 2NO2(g) <----> N2O4(g)

A) It would make the reaction more exothermic.

B) It would slow the reaction down.

C) It would decrease the final quantity of products.

D) It would increase the final quantity of products.

E) It would make the reaction more endothermic. 

Which one of the following is NOT a colloid or suspension?

A) an aerosol

B) salt water

C) smoke

D) milk

E) fog

The magnitude of equilibrium constant Kw (1.0 × 10-14M) of water indicates that __________.

 A) water autoionizes very quickly

B) water autoionizes only to a very small extent

C) water autoionizes very slowly

D) the autoionization of water is exothermic

A substance that is capable of acting as both an acid and as a base is __________.

A) autosomal

B) conjugated

C) miscible

D) saturated

E) amphoteric

How many mL of 6.00 M NaOH solution would be required to prepare 2.50 L of 0.0100 M NaOH by dilution?

A) 150. mL

B) 4.17 mL

C) 2.40 mL

D) 41.7 mL

E) 240. mL 

Which as given below, when dissolved in 1L water , would have the most dramatic effect on the colligative properties like freezing point depression of water?

A) 0.15 mole of NaCl

B) 0.10 mole AlCl3

C) 0.12 of K2 S

D) 0.18 mole NH4ClO4

E) 0.25 mole of glucose (C6H12O6)

Olive oil does not dissolve in water because

A) Olive oil is hydrated.

B) water is saturated.

C) water has a different density than olive oil.

D) Olive oil is polar and water is nonpolar.

E) Olive oil is nonpolar and water is polar

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K2S and Fe(NO3)2 are mixed. [Fe(NO3)2(aq)+ 2 K2S(aq)  FeS(s) + 2 KNO3 (aq)]

A) K+(aq) + NO3 -(aq)---->  KNO3(s)

B) Fe2+(aq) + S2-(aq) ---> FeS(s)

C) Fe2+(aq) + S2-(aq) + 2 K+(aq) + 2 NO3 -(aq) ---> Fe2+(aq) + S2-(aq) + 2 KNO3(s)

D) Fe2+(aq) + S2-(aq) + 2 K+(aq) + 2 NO3 -(aq)--->  FeS(s) + 2 K+(aq) + 2 NO3 -(aq)

E) No reaction occurs

The mass/volume percent concentration refers to

A) grams of solvent in 100 mL of solution.

B) grams of solute in 1 L of solution.

C) grams of solute in 100 mL of solution.

D) grams of solute in 1 L of solvent.

E) grams of solute in 100 mL of solvent. 

Of the following, __________ is a weak acid.

A) HBr

B) HCl

C) HNO3

D) H2 SO4

E) HF

Which of the following is NOT a conjugate acid-base pair?

A) H3O/OH

B) C2H3O2/HC2H3O2

C) H2SO3/HSO3

D) NH4 +/NH3

E) All of the above are conjugate acid-base pairs. 

In seawater large amounts of sodium chloride (NaCl) are dissolved. What is the major interaction between

the ions of NaCl and water?

A) ion-ion

B) dipole-dipole

C) hydrogen bonding

D) ion-dipole

E) dispersion 

The correct formula for sulfuric acid is

A) H2SO3.

B) H2SO3 -.

C) H2SO4 -.

D) SO4 2-.

E) H2SO4

In any chemical reaction, the rate of the reaction can be increased by

A) adding water to the reaction.

B) adding product molecules to the reaction mixture.

C) increasing the concentrations of the reactants.

D) changing the size of the container.

E) decreasing the temperature.

In basic solution, the following is true: __________.

A) [H3O+] > [OH-]

B) [H3O+] = 0 M

C) [OH-] > 7.00

D) [H3O+] = [OH-]

E) [H3O+] < [OH-]

The medical process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining large particles is called

A) dilution.

B) hydration.

C) dialysis.

D) solvation.

E) osmotic pressure.

The molar concentration of hydronium ion (H3O+) in pure water at 25°C is __________.

A) 0.00 M

B) 1.0 × 10-7M

C) 7.00 M

D) 1.0 × 10-14M

E) 1.00 M 

 For the following reaction, the determine the equilibrium constant Kc if the concentration of both products is 0.10 M and the concentration of the starting material NOBr is 0.0224 M at equilibrium? 2NOBr(g)  2NO(g) + Br2(g); Kc = [Br2][NO]2 [NOBr]2

A) 0.45

B) 20

C) 2.0

D) 0.50

E) 2.2

What is the molarity of a KOH solution if 25.0 mL neutralizes 35.0 mL of a 0.200 M HCl solution?

A) 0.100 M

B) 0.280 M

C) 0.267 M

D) 0.143 M

E) 0.200 M 

Please consider a 4% starch solution and a 10% starch solution separated by a semipermeable membrane to answer the following : The physical process that occurs in this system is called

A) filtration.

B) neutralization.

C) osmosis.

D) dialysis.

E) hydration

The mathematical expression of the Dalton's law is

A) P1V1 = P2V2.

B) PV = nRT.

C) P1 V1 = P2 V2 .

D) P1 T1 = P2 T2 .

E) Ptotal = P1 + P2 + P3+.... 

Which of the following is a neutralization reaction?

A) H2O (l) + SO3 (g)---->H2SO4(aq)

B) 2NO2 (g)---> 2NO (g) + O2(g)

C) 4Na (s) + O2 (g)--->  2Na2O (aq)

D) KCl(aq)+ NaNO3(aq)--->  KNO3(aq)+ NaCl(aq)

E) HNO3 (aq) + KOH (aq)---> H2O (l)+ KNO3(aq)

In the following gas phase reaction, Kc is much less than 1. At equilibrium, which of the following statements is true? COCl2(g) <----> CO(g) + Cl2(g)

A) The concentrations of products and reactants are approximately equal.

B) The concentration of products is much greater than the concentration of reactants.

C) At equilibrium, the concentrations of reactants and products are equal.

D) A catalyst will increase the concentration of products formed.

E) The concentration of reactant is much greater than the concentration of products.

According to Avogadro's law

A) the volume of a gas is directly related to the number of moles at constant temperature and pressure.

B) the volume of a gas depends only on the number of moles in the sample.

C) the volume of a gas is inversely related to the number of moles at standard temperature and pressure.

D) the volume of a gas depends only on the temperature and pressure.

E) the volume of a gas is inversely related to the number of moles at constant temperature and pressure.

Use the reaction: 2AgNO3(aq) + H2SO4(aq) d Ag2SO4(s) + 2H2O(l) What volume of 0.123 M AgNO3(aq) (169 g/mol) is needed to form 0.657 g of Ag2SO4(s) (310 g/mol)?

A) 10.7 mL

B) 34.4 L

C) 17.2 mL

D) 53.4 mL

E) 34.4 mL 

Nitric acid is a strong acid. This means that __________.

A) HNO3 does not dissociate at all when it is dissolved in water

B) aqueous solutions of HNO3 contain equal concentrations of H+(aq) and OH-(aq)

C) HNO3 produces a gaseous product when it is neutralized

D) HNO3 cannot be neutralized by a weak base

E) HNO3 dissociates completely to H+(aq) and NO3 -(aq) ions when it dissolves in water 

The equilibrium constant for the reaction for the decomposition of PCl5 to chlorine and PCl3 is 0.042. PCl5(g)  PCl3(g)+ Cl2(g) Kc = [PCl3][Cl2] [PCl5] If the equilibrium concentrations are [PCl3] = 0.010 M, [Cl2] = 0.10 M, what is the value of [PCl5]?

A) 0.024 M

B) 0.0020 M

C) 0.0010 M

D) 0.042 M

E) 0.010 M 

A Br+nsted-Lowry base is defined as a substance that __________.

A) increases [OH-] when placed in H2O

B) acts as a proton donor

C) increases [H+] when placed in H2O

D) acts as a proton acceptor

E) decreases [H+] when placed in H2O

What is the pH of a solution with [ H3O+] = 1 × 10-9 M?

A) 1.0 × 10-5 M

B) 9.0

C) 5.0

D) -5.0

E) -9.0

An acid and base react to form a salt and water in a(n) ________ reaction.

A) neutralization

B) ionization

C) oxidation

D) reduction

E) dissociation 

3H2(g) + N2(g) <----> 2NH3(g) + heat For the above exothermic reaction at equilibrium, if the temperature is raised, the amount of N2 will

A) decrease.

B) increase.

C) stay the same. 

The name of Ca(OH)2 is

A) calcium oxygen hydride.

B) monocalcium dihydroxide.

C) calcium dihydroxide.

D) calcium(II) hydroxide.

E) calcium hydroxide. 

In osmosis, there is a net flow of __________ molecules through a __________ membrane toward the more __________ solution.

A) solute, semipermeable, dilute

B) solvent, porous, dilute

C) solvent, semipermeable, concentrated

D) solute, semipermeable, concentrated

E) solute, permeable, concentrated 

What is the correct form for the equilibrium constant expression for this reaction? 2 HF(g) <--> H2(g) + F2(g)

A) H2 F2/ 2 HF

B) H2 F2/ HF

C) HF H2 F2

D) H2/ F2 /HF 2

E) HF 2/ H2 F2