CHEM Exam 2

What is the molarity of NaOH solution if 39.1 mL of a 0.112 M H2SO4 solution is required to neutralize a 25 mL sample of the NaOH solution?

**-0.350 -0.0716 -0.143 -54.7 -0.175

How many moles CH3CH2Cl are contained in 548 mL of 0.0788 M CH3CH2Cl solution?

**-4.32x10^-2 mol -2.32x10^-2 mol -6.95x10^-2 mol -1.44x10^-2 mol -5.26x10^-2 mol

Choose the statement below that is true.

**-A weak acid solution consists of mostly nonionized acid molecules. -The term "strong electrolyte" means that the substance is extremely reactive. -A strong acid solution consists of only partially ionized acid molecules. -The term "weak electrolyte" means that the substance is inert. -A molecular compound that does not ionize in solution considered a strong electrolyte.

Which of the following compounds is soluble in water?

**-CaS -MgCO3 -PbI2 -SrSO4 -None of these compounds is soluble in water

Define Thermal Energy

**-Energy associated with the temperature of an object. -Energy associated with the motion of an object. -Energy associated with the force of an object. -Energy associated with the gravity of an object. -Energy associated with the position or composition of an object.

What is the oxidation number of the sulfur atom in Li2SO4?

- -2 - +2 - +4 **- +6

If 4.89g of ZnCl2 is dissolved in enough water to give a total volume of 500 mL, what is the molarity of the solution?

-0.217 M -0.0179 M **-0.0717 M -1.33 M -0.849 M

How much heat energy is required to raise the temperature of 0.298 mole of water from 35.93 C to 79.84 C? The specific heat capacity of water=4.18 J/gC.

-13.1 J -54.7 J **-985 J -2105 J -3310 J

Which pair of compounds is soluble in water?

-Hg2Cl2 and Hg2Br2 -NiS and Li2S **-NH4I and Ni(NO3)2 -LiNO3 and CuCO3

A piece of iron (mass=25 g) at 398K is placed in a styrofoam coffee cup containing 25 mL of water at 298K. Assuming that no heat is lost to the cup or the surroundings what will the final temperature of the water be? The specific heat capacity of iron=0.449 J/gC and water=4.18 J/gC.

-348 K **-308 K -287 K -325 K -388 K

How many milliliters of 0.200 M FeCl3 are needed to react with an excess of Na2S to produce 2.75g of Fe2S3 if the percent yield for the reaction is 65.0%? 3 Na2S(aq)+2FeCl3(aq)--> Fe2S3(s)+6NaCl(aq)

-50.9 mL -86.0 mL -102 mL **-204 mL

What volume of 0.305 M AgNO3 is required to react exactly with 155.0 mL of 0.274 M Na2SO4 solution? Hint: You will want to write a balanced equation.

-581 mL -173 mL -345 mL -139 mL **-278 mL

The specific heat capacity of liquid mercury is 0.14 J/gK. How many joules of heat are needed to raise the temperature of 5.00 g of mercury from 15.0 C to 36.5 C?

-7.7 x 10^2 J **-15 J -36 J -0.0013 J -1.7 J

How many molecules of Sucrose (C12H22O11, molar mass=342.30 g/mol) are contained in 14.3 mL of 0.140 sucrose solution?

-8.29x10^22 molecules **-1.21x10^21 molecules -6.15x10^22 molecules -1.63x10^23 molecules -5.90x10^24 molecules

Identify the spectator ions in the following molecular equation. KBr(aq) + AgNO3(aq) --> AgBr (s) + KNO(aq)

-Ag+ and Br- **-K+ and NO3- -K+ and Br- -Ag+ and NO3- -There are no spectator ions in this reaction

Which of the following statements about energy is false?

-Energy can be converted from one type to another. -The total energy of a system remains constant. **-Kinetic Energy is the energy associated with its position or composition. -Energy is the capacity to do work. -Systems tend to change in order to lower their potential energy.

What element is undergoing oxidation (if any) in the following reaction? 2HCl(aq) + Ca(OH)2(aq) --> 2H2O(l) + 2CaCl2(aq)

-H -Cl -Ca -O **-This is not an oxidation-reduction reaction

The chemical formula for sulfurous acid is

-H2S(aq) **-H2SO3(aq) -H2SO4(aq) -H2S2O7(aq)

Give the units of heat capacity.

-J/C **-J/gC -Jmole/C -g/C -mole/C

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

-K2CO3 + NaBr -Na2 + LiOH **-CaS + Na2SO4 -None of these solution pairs will produce a precipitate. -All of these solution pairs will produce a precipitate.

Which one of the following compounds is insoluble in water?

-K2SO4 -NaNO3 **-PbSO4 -Rb2CO3

The Law of _________ states that energy can neither be created nor destroyed.

-Kinetic Energy -The Consecration of Energy -Potential Energy **-The Conservation of Energy -Thermochemistry

What element is undergoing oxidation (if any) in the following reaction? 2MnO4-(aq) + 3NO2-(aq) + H2O (l) --> 2MnO2 + 3NO3-(aq) + 2OH-(aq).

-Mn -O **-N -H -This is not an oxidation-reduction reaction

Which of the following statements is true?

-State functions do not depend on the path taken to arrive at a particular state. -DErxn can be determined using constant volume calorimetry. Energy is neither created nor destroyed, excluding nuclear reactions. -DeltaHrxn can be determined using constant pressure calorimetry. **-All of the above are true.

Define molar heat capacity.

-The quantity of heat required to raise the temperature of 1 mole of a substance by 1 C. **-The quantity of heat required to change a system's temperature by 1 C. -The quantity of heat required to raise the temperature of 1 gram of a substance by 1 C. -The quantity of heat required to lower the temperature of 1 g of a substance by 1 F. -The quantity of heat required to lower the temperature of 1 L of a substance by 1 C.

Determine the name for aqueous HBr.

-bromic acid -bromous acid -hydrobromous acid -hydrogen bromate **-hydrobromic acid

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of H2S04 and KOH are mixed.

H+ (aq) + OH-(aq) --> H20(l)