You have 90 minutes to complete the whole section.
There are 60 multiple-choice questions for this part of the exam.
You can enter your answers on the answer sheet.
No credit will be given for answers marked on the test itself.
To take the test, mark your answer next to the question and then transfer it to the scoring sheet.
There is only one answer to each question.
Changing answers should be erased completely.
Some people won't know the answers to all of the questions.
To your advantage, you can provide an answer to all questions.
Don't waste time on difficult questions.
If time remains, answer the easier ones first and then the difficult ones.
The number of questions answered correctly is the total score.
Wrong answers on the scoring sheet do not count against you.
You can use the table of equations and constants on this part of the test.
If the problem indicates a different solvent, then assume that H 2 O is the solvent for all solutions.
The questions or incomplete statements that follow are followed by four suggested answers or completions.
The best response to the question will be chosen.
Which of the following should be the strongest acid because it is the heaviestHI, because the bond length is longestHBr, and because water forms the strongest hydrogen bonds?
If zinc metal is not available, which of the following would be a reasonable and safe substitute?
This equation can be interpreted in a number of ways, but the only way that will change the equilibrium is if either S or O2(g) is completely used up.
A piece of magnesium was weighed.
50 mL of hydrogen was collected.
The Mg was dried and weighed again to see how much it had reacted to the water.
The pressure was measured at 755 torr.
The moles of hydrogen were created by measuring the volume of hydrogen.
The smallest error in the result will be caused by forgetting to dry the magnesium before weighing the second time.
The final temperature of the mixture was 35degC.
The sample lost more heat energy than the water did because the sample temperature changed more than the water did.
H3O+ and OH-H3PO4 and H3PO3CO32- and HCO3-SO32- and SO22 are acid-base pairs.
Three 1-liter flasks are connected to a 3-liter flask.
The entire system is at 298 K after the first flask is evacuated.
The pressure of the gas is very high.
The amounts of gas are determined by the representations in the flasks.
A portion of a mass spectrum of neon is presented above.
If the height of each line represents the relative amount of each mass, you can estimate the average mass of naturally occurring atoms of neon.
Which of the particulate diagrams best represents the reaction of carbon monoxide with oxygen to form carbon dioxide?
Questions 18-22 refer to the following diagram and data.
After small volumes of 0.075 M HCl were added to a weak base, the pH was measured with a meter.
The data is shown in a graph.
Which arrow points to the curve where the pH is 14 - pKb?
The region where the solution can be described as a buffer is indicated by the two points on the curve.
The base is dibasic since two end points are observed.
The concentration of the base is 0.075 If a 0.0100 M solution of methylamine is prepared, the expected pH will be in one of the following ranges.
The sample with the lowest density is the same in all three samples since the temperatures are the same in all vessels.
Which attractive force is least likely to cause condensation?
The Lewis electron-dot structures ignore charges for sulfur trioxide and sulfite ion.
The sulfur trioxide and the sulfite ion are both triangular pyramids, which is the best description of their geometry.
The sulfur trioxide species has two negative charges along with a shape that makes it a dipole.
Sulfur trioxide is not polar.
The sulfur trioxide and the sulfite ion are both polar with the only difference being that one is an ion and the other is not.
The net ionic equation is used for the reaction.
What is the approximate molar solubility of lead in distilled water?
1.7 x 10-5 mol/L10-7 mol/L10-2 mol/L10-15 mol/L Questions 34-38 refer to the following equation.N2O A pure sample of N2O4(g) is placed into a container.
The N2O4(g) has a pressure of 760 torr.
The temperature is kept constant until the N2O4(g) reaches equilibrium.
The pressure of the system is shown in the figure.
The intermolecular attractions inside the container decrease, so the molecules strike the walls more frequently.
How much will the equilibrium pressure increase if this reaction goes to completion?
If 1.0 g of rubidium and 1.0 g of bromine are reacted, what will be left in the reaction vessel?
The space for the solute is created by the separation of the solvent molecule from each other.
Solute molecule are separated so they fit in the solvent.
The solute and solvent are brought together.
Which of the statements about the energy involved in the above is correct?Steps 1 and 2 are exothermic, and step 3 is endothermic.
Pt has a boiling point of 3825 and a first ionization energy of 870 kJ/mol.
Which of the following are the most reasonable values of boiling point and energy?
The long chains of n-pentane make it more difficult for them to reach the liquid surface and vaporize.
The long chains of n-pentane provide more sites for London attractive forces for neighboring molecule to have an effect on each other.
To separate the two cells, equalize the charge between the two cells, and allow the reducing substance to flow to the other cell to react with the oxidizing material, what is the purpose of a salt bridge in a galvanic cell?
What are the most probable values for the ionized energy and atomic radius of sodium?
The best interpretation of the data is provided in the table below.
The monoprotic acid is dissolved in 0.250 L of distilled water.
The measured pH was 4.26.
There are four different acid solutions of 0.0100 M prepared, and their pH values are recorded on a laptop computer.
One of the solutions has more than just an acid.
All four solutions are combined with an equal amount of water.
The bottom line is solution 1 and the top line is solution 4.
Which of the four acids is best described as a strong acid?Solution 1 since the initial pH is 2.00,Solution 2 since there is a small pH change, andSolution 3 since added water doesn't affect the pH.
The O-H bonds in sulfuric acid are much weaker than those in sulfur, making it a weak acid.
The p electrons have the same energy as the three lowest energy electrons.
If you finish before 90 minutes have elapsed, you can check your work in this section.
You should not go on to section 2 until you are familiar with it.
When you have 105 minutes to complete the whole section, start.
The questions can be found on the following pages.
Section I gave you the table of equations and constants.
The final answers will be written in the test booklet.
Write your answers on the lined paper.
You will need about three pages for each of the questions.
Don't spend a lot of time on one question.
Answer the easier questions first.
It is important that your work is easy to read.
If you have any mistakes, cross out or erase them.
Erased and crossed-out material will not be scored.
Questions 1, 2, and 3 are long questions.
The questions should take about 20 minutes to answer.
The questions are shorter.
Each person should take about 10 minutes to answer.
Write your responses on lined paper after reading the questions carefully.
Your answers will be graded based on their correctness and relevance to the question.
Explanations need to be clearly written.
Specific answers are better than broad statements.
Since you may receive partial credit, it's important to show clearly the method used and the steps involved in arriving at your answers.
You can only check your work if you finish before 90 minutes have elapsed.