Unit 3-4 Multiple Choice

According to the balanced equation above, how many moles of ClO2 are needed to react completely with 20 ml of 2 M KMnO4 solution?

.030 moles

How many moles of NaOH + ions are in 100 ml of .2 M na3po4

.0600 mol

Equal masses of He and Ne are placed in a sealed container. What is the partial pressure of Ne if the total pressure in the container is 6 ATM?

1 atm

A .2 mol sample of mgcl2 and a .1 mol sample of KCl are dissolved in water and diluted to 500 mL. What is the concentration of Cl in the solution?

1.0 M

The total pressure of the gas mixture is .500 atm and the partial pressure of nitrogen is...

1.00 atm

in the reaction represented above, what is the total number of moles of reactants consumed when 1 mol of CO2 is produced?

2 moles

In the reaction represented above, what mass of HF is produced by the reaction of 3.0x10^23 molecules of H2 with an excess of F2

20g

An Oxidation reduction reaction that is also a synthesis reaction

2H2 + O2 → 2H2O

The half reactions for the oxidation reduction reaction between Al + Zn2 + are represented above based on half reactions, what is the coefficient for ZN in the equation for oxidation reduction reaction that is balanced with the smallest whole number coefficients?

3

which of the following best represents the contents of a box after the reaction has preceded and as completely as possible?

4 sets of three one set of 2

Over what volume rain should the student collect the distillate of the compound with the weakest intermolecular forces?

B

if equal masses of the following compounds undergo complete combustion, which will yield the greatest mass of CO2?

Benzene, C6H6

The reactions represented above occur in an aqueous solution of oxalic acid. Which of the following represents a Bronsted Lowry conjugate acid base pair?

HC2O4 and C204

A .5 mol sample of he and a .5 mol sample of ne are placed separately into 10 liter rigid containers at 25° C. Each container has a pinhole opening. Which of the gases, he or ne, will escape faster through the pinhole and why?

He will escape faster because the he atoms are moving at a higher average speed than the ne atoms

equal masses of three different ideal gases, x, y, and z are mixed in the sealed rigid container. If the temperature of the system remains constant, which of the following statements about the partial pressure of Gas X is correct?

It depends on the relative molecular masses of x y and z

based on the diagram above, which of the following best helps explain why MgO(s) is not able to conduct electricity, but MgO(l) was a good conductor of electricity?

MgO(s) consists of separate mg ions and o ions held by a fixed lattice, but in MgO(l) the ions are free to move and conduct electricity

.1 molar aqueous solution of sodium sulfate is a better conductor of electricity than a .1 molar aqueous solution of sodium chloride. Which of the following best explains this difference?

More moles of ions are present in a given volume of .10 molar of na2so4 then in the same volume of .10 molar NaCl

solid at room temperature?

Na2S

based on the tables above, which of the following statements provides the best prediction for the boiling point of NaCl?

NaCl will have a lower boiling point than that of Naf because the Columbus attractions are weaker in NaCl then in Naf

white crystalline solid

NaOH

Atoms of which element are reduced in the reaction above?

O in Na2O2; each atom gains one electron

a sample of ch3oh is placed in a previously evacuated vessel with a pressure of 600 K. What is the final pressure in the vessel after the reaction is complete and the contents of the vessel are returned to 600k?

P/3

Equal volumes of CO2 molar lead nitrate and potassium bromide are combined to form lead bromide as a yellow precipitate. Which of the following is the correct net ionic equation for the reaction?

PB + 2BR→ PbBr2

A student had to dilate, colorless Solutions, HCL and NaOH, which were at the same temperature. This student combined the solutions, and the reaction represented above occurred. Which of the following results would be evidence that a chemical reaction took place?

The temperature of the reaction mixture increases

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

X < Y < Z

The exothermic process represented above is best classified as?

a Chemical change because covalent bonds are broken and new covalent bonds are formed

a 1 liter sample of pure gas is found to have a lower pressure than that predicted by the ideal gas law. the best explanation for the observation is that the molecules of the gas...

are attracted to each other and do not exert as much force on the container walls as they would if they had no Mutual attractions

the table above shows the structural formula and molar masses for three different compounds. Which of the following is a list of the compounds in order of increasing boiling points?

butane <acetone <propanol

equal volumes of Solutions in two different vessels are represented above the solution represented in biathlon is KCl then the solution represented in vessel to could be an aqueous solution of...

cacl2 with twice similarity as the solution in vessel one

in the diagram above, which of the labeled arrows identifies hydrogen bonding in water

d

on the basis of the chromatogram and the information about solvents in the table above, which of the following would be the best way to decrease the distance that the products have to travel up the plate?

decrease the percentage of ethyl acetate in the solvent

Which diagram provides the better particle representation for the solubility of o2 in H2O and why?

diagram 2, because the polar H2O molecules can induced temporary dipoles on the electron clouds of o2 molecules

Benzene C6 H6 has the structure shown above. Considering the observation that Benzene is only sparingly soluble in water, which of the following best describes the intermolecular forces of the attraction between water and benzene?

dipole - induced dipole and London dispersion

Which of the following laboratory setups is most appropriate for the student to use in order to separate and collect a substantial sample of each of the two hydrocarbons?

distillation

a 2 mol sample of F2 reacts with excess NaOH according to the equation above. If the reaction is repeated with the excess NaOH but with 1 mol of F2, which of the following is correct?

f2 halved

At 298 K and 1 atm, br2 is a liquid with a high vapor pressure, and cl2 is a gas. Those observations provide evidence that under the given conditions

forces among br2 molecules are stronger than those among cl2 molecules

The MaxwellBoltzman distribution of molecular Speeds and samples of two different gases at the same temperature as shown below. Which gas has the largest molar mass?

gas a

The Maxwell Boltzman distribution of molecular Speeds and samples of two different gases at the same temperature as shown below. Which gas has the smallest molar mass?

gas b

diagrams above represent solutes present in two different dilute aqueous Solutions before they were mixed. Water molecules are not shown. When the solutions were combined a precipitation reaction took place. Which of the diagrams below is the best particle representation of a mixture after the precipitation reaction occurred?

it is the answer choice where the AG and cl's are packed while the na's and NO3's are floating around

after all the gases are combined in a previously evacuated two

liter vessel what is the total pressure of the gases at 298 K? - 4.58 atm

compared to the equilibrium vapor pressure of ch3oh at 300 K, the equilibrium vapor pressure of C2H5OH at 300K is

lower, because London dispersion forces among C2H5OH molecules are greater than those among ch3oh molecules

The pressure of each gas is increased at a constant temperature and condensation occurs, which gas will condense at the highest pressure?

methane

when C2 H2 reacts with H2, the compound c2h for is produced by the equation above. The reaction is correctly classified as which of the following ppes?

oxidation reduction, because H2O is oxidized

the reaction represented above is observed to proceed spontaneously to the left in aqueous solution. In this system the strongest base is

so4

at constant temperature, the behavior of a sample of a real gas more closely approximate that of an ideal gas as the volume of the container is increased because

the average distance between molecules becomes greater

which of the following describes the changes in forces of attraction that occur as H2O changes phase from liquid to Vapor?

the hydrogen bonds between H2O molecules are broken

which of the following diagram shows the correct representation of the hydrogen bonding between thymine and adenine base pairs?

the one with only one backbone

which of the following graph shows the speed distribution from the same molecules at a lower temperature?

the one with the tallest dotted line

the average kinetic energy of the gas molecules is

the same in all three containers

the student made the standard curve to the left. Which of the following most likely caused the air in the point the student plotted at point of 050 molar of CO2 +?

there was distilled water in the cuvette when the student put the standard solution in it

which of the following correctly compares the two samples in terms of their deviation from ideal gas behavior and explains why?

xe atoms are closer together

In a paper chromatography experiment, a sample of pigment is separated into two compounds, X and Y, as shown in the figure above. The surface of the paper is moderately polar. What can be concluded above X and Y based on the experimental results?

y is more polar than x