Chem 10-10-10

Propane gas, C3H8, burns according to the equation below....

a) 0.050 mol O2 remains unreacted and pressure has increased

A first-order reaction has a half life of 36s....

a) 1.9 x 10^-2

Has the greatest mass in solution

a) 400 mL of 0.30M NH4Cl

Acts as a Lewis acid but not as a Broasted-Lowry acid

a) BF3

Which of the following compounds will NOT form hydrogen bonds?

a) CH2F2

A 22.0 gram sample of an unknown gas occupies 11.2 L at STP. Which of the following could be the identity of the gas?

a) CO2

Which element is expected to have the greatest polarizability?

a) Fe

Identify the reaction in which Kc is equal to Kp

a) H2 + S <=> H2S

Which of the following lists of species is in order of increasing boiling points?

a) H2, N2, NH3

Identify the net ionic equation for the reaction of Acetic acid and sodium hydroxide

a) HC2H303 + OH-.....

The value of Ka for HSO4- is 1 x 10^-2...?

a) Kb = 1 x 10^-12

The proposed reaction mechanism for the reaction of nitrogen dioxide and ozone is detailed above...

a) Rate = k [NO2][O3]

Which of the following is polar?

a) SF4

Gives a red flame test

a) Sr

If the temperature increases from 10 C to 60 C at a constant pressure of 0.4 atm, which of the processes occurs?

a) Sublimation

In the reaction profile A, B, and C should be labeled as shown in

a) [A] Potential energy [B] Reaction Progress [C] Activation Energy

The term "weighted average atomic mass" refers to a calculated atomic mass that takes into account

a) naturally occurring distribution of isotopes

What will happen in the salt bridge as the reaction progresses?

a) the Na+ ions will flow into the Cu/Cu+ half-cell

If the Cu+ +e- ==> Cu half reaction has a standard reduction potential of +0.52...

b) -0.76 V

Given the following thermochemical data: ... determine the heat of the reaction

b) -171.07 kJ

A mixture containing 0.60 mol Al in contact with 0.75 mol of Cl2 is ignited...?

b) 0.50 mol AlCl3 and 0.10 mol Al unreacted

The weak acid H2A ionizes in two steps with these equilibrium constants

b) 1.0 x 10^-10

What is the bond order of the C-O bond in ozone?

b) 1.3

Valence electrons in which of the atoms represented below would have the highest...?

b) 10 p, 10 n

Has the lowest boiling point

b) 500 mL of 0.10 NaCl

What percentage of the original pressure will the final pressure in the container be equal to?

b) 80%

Which of the following has the smallest ionic radius?

b) Al 3+

Which of the following compounds is incorrectly classified?

b) CH3OH is a weak electrolyte

If the pressure increases from 0.5 to 1.5 atm at a constant temperature of 50 C, which of the processes occurs?

b) Condensation

If the temperature decreases from 110 C t0 40 C at a constant pressure of 1.1 atm, which of the processes occurs?

b) Condensation

Can have a +1 and +2 oxidation state

b) Cu

Consider the three acids: HF, HSO4-, and H2PO4- ...

b) F-, SO4-2, and HPO4-2

A certain reaction is non-spontaneous under standard conditions, but becomes spontaneous at lower temperature...?

b) H<0, S<0 and G>0

How does the pH of the solution change as the reaction progresses?

b) It increases but the solution remains acidic

Forms a gas when reacted with an acid

b) Na2CO3

Will form a precipitate in the presence of Ag+

b) Na2CO3

Which of the following has a zero dipole moment?

b) PF5

Their presence explains why the bonds of BF3 are all the same

b) hybrid bond

When potassium carbonate is dissolved in water

b) the solution is basic because of the hydrolysis of the CO3-2 ion

Which particulate drawing best represents the contents of the flask after the reaction?

c)

What is the enthalpy change for reaction 1?

c) -18 kJ/mol

A 40.0 mL sample of 0.25 M KOH is added to 60.0 mL of 0.15 M Ba(OH)2...

c) 0.28 M

A gaseous mixture containing 7.0 moles of nitrogen, 2.5 moles of oxygen, and 0.5 mole of helium ...

c) 0.63 atm

The temperature of a sample of an ideal gas confined in a 2.0 L container was raised form 27 C to 77C...?

c) 1,400 mmHg

A first order reaction has a half-life of 85 s. What fraction of the reaction is left after 255s?

c) 1/8

When the equation above is balanced and all coefficients are reduced to their lowest whole number terms, ...?

c) 12

How many electrons can fit in an orbital in which n=3?

c) 18

The rate at which CO2 is produced by the following reaction....

c) 2.8 x 10^-2

Is not a conductive solutions

c) 200 mL of 0.30M CH3Cl

Which labeled arrow is pointing toward a hydrogen bond?

c) 3

Addition of a catalyst to the reaction mixture will only affect

c) C

Which of the following is most soluble in hexane, C6H14?

c) C6H6

dissolves as a weak electrolyte

c) CH3COOH

In which of the following molecules does hydrogen have an oxidation state of -1?

c) CaH2

Which of the following nuclei has 3 more neutrons than protons?

c) Cl

Is considered a weak electrolyte

c) HNO2

Which could account for a change in the distance between molecules in a sample of gas?

c) I (increase in density at a constant temperature) and II (increases in temp at a constant pressure) only

As the reaction progresses, what will happen to the overall voltage of the cell?

c) It will decrease as [Zn] increases

Which species is being oxidized and which species is being reduced?

c) Oxidized: Ni Reduced: Cr2O7-2

What is the net ionic equation for the following reaction that takes place in an aqueous solution?

c) Pb+2 + 2Cl- ==> PbCl2

The rate law for a reaction is found to be rate = ...

c) The reaction is unlikely since it implies the simultaneous collisions of two atoms of A and one of B

For following reaction: ... which change will NOT be effective in increasing the amount of N2O4?

c) adding a catalyst to the reaction vessel

An unknown substance is found to have a high melting point. In addition, it is a poor conductor ...

c) covalent network bonding

Under what conditions would reaction 3 be spontaneous?

c) it is only favored at low temperatures

Compared to water, a 0.20M solution of NaCl will have all of the following properties EXCEPT

c) lower boiling point

A graph of the reciprocal of reactant concentration versus time will give a straight line for

c) second order reaction

Which of the following diagrams best represents what is happening on a molecular level when NaCl dissolves in water?

d)

Contains the highest concentration of Cl- ions

d) 100 mL of 0.30 M MgCl2

If 64 g of CH4O were to decompose via reaction 4, approximately how much energy would be released or absorbed?

d) 130 kJ of energy would be released

If a reactant's concentration is doubled and the react rate increases by a factor of 8, ....

d) 3

What is the weight of NaNO3 (molecular weight 85.0) present in 100 mL of a 4.00 molar solution?

d) 34.0 grams

When the equation for the following reaction is balanced, the lowest whole-number coefficient for H2O will be

d) 4

How many moles of electrons are transferred when 1 mole of potassium dichromate is mixed with 3 mole of nickel?

d) 6 moles of electrons

When the equation for the half reaction above is balanced with the lowest whole number coefficients, the coefficient for H2O is

d) 7

Correctly identify the anode and cathode in this reaction as well as where oxidation and reduction are taking place

d) Cu is the cathode-reduction Zn is the anode-oxidation

A strong electrolyte that produces a solution that is acidic

d) FeCl3

Which of the following is true for all the reactions?

d) More energy is released when the bonds in the products form than is necessary to break down the bonds in the reactants

What is the percent composition by mass of the elements in the compound NaNO3?

d) Na 27%, N 16%, O 57%

All of the following are true about a boiling liquid except

d) S must equal H

Which of these molecules has the most pi bonds?

d) SO3

Which physical transformation is the process called sublimation?

d) Solid to gas

Based on concepts of polarity and hydrogen bonding, which of the following sequences correctly lists the compounds above in the order of their increasing solubility in water?

d) X<Y<Z

The unusually high melting point of HF is due to this

d) hydrogen bond

In the reaction described by the reaction profile

d) reverse E < forward E and H is endothermic

In a titration experiment, a 0.10 M H2C2O4 solutions was completely neutralized by addition of ...

e)

Has naturally radioactive isotopes

e) Am

Has the largest atomic radius

e) Am

Illustrates amphiprotic behavior in an aqueous solution

e) KHSO3

This causes C30H62 to be a non polar compound that is solid at room temp.

e) London forces