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.
Four different acid solutions are prepared, and their pH values are determined.
Which of the four acids is best described as a strong acid?Acid 1Acid 2Acid 3Acid 4 The last line of the table shows the end point pH values.
An experiment was performed to determine the moles of hydrogen gas formed (collected over water) when acid 3 is strong and all the other acids are weak.
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 moles of hydrogen were created by measuring the volume of hydrogen.
The largest error in the result will be caused by forgetting to dry the magnesium before both weighings and failing to convert the gas-collecting container to K. The final temperature of the mixture was 37degC.
The equilibrium constant must be less than 1 because the sample temperature changed more than the water temperature.
Three 1-liter flasks are connected to a 3-liter flask.
Oxygen, hydrogen, and nitrogen are contained in the first three liters of the system.
The pressure of hydrogen is very high.
The amounts of gas are determined by the representations in the flasks.
The mass spectrum of a naturally occurring sample of an element is shown above.
There is not enough information about the element.
The titration curve below is of a weak base and a strong acid.
The above graph shows the data from that experiment.
Which sequence lists the corresponding anions in order of increasing base strength?
If you want the best results with a visual indicator, add the indicator two drops before the end point.
The observed color change will be distinct, and the calculated molarity of the base will be accurate, if the student uses a pH indicator that changes color from pH 6 to 8.
A student is doing a titration of a weak acid with a strong base of the same concentration.
Which is the easiest way to burn a copper penny, a covalent bond or a hydrogen bond?
If a 100 M solution of morphine is prepared, the expected pH will be in the range of 2 to 44 to 12.
All of the samples have the same density since the temperatures are the same.
Which attractive force is the main cause of condensation?Hydrogen bondingLondon forces Dipole-dipole attractive forcesMolar mass The S-O bond order and the arrangement of atoms suggested in the skeleton are both true.
The charges should be minimized.
The sulfite ion has a triangular pyramid shape, the S-O bond order is nonpolar, and the sulfite ion has a double bond.
The diagram below shows the approximate molar solubility of PbCl2 in a solution of 0.17 M Pb2+ ion.
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.
Which is the correct description of the partial pressures of N2O4 and NO2?
The reaction goes to completion because of the given pressure.900 torr, but it doesn't go to equilibrium.
Which diagram is appropriate for calculating Kp?Kp is a combination of numbers.
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.
solute and solvent are brought together to fill the spaces.
All of the fundamental principles below are important in understanding the formation of solutions.
The boiling point of bromide is 59degC, and the boiling point of Iodized Salt is 184degC.
The I2 molecule is larger than the Br2 molecule.
The I2 electron clouds are more polarizable than the Br2 electron.
Which is the best reason for the large difference in boiling points?
The vapor pressure of ethachic acid is much lower than that of ethanol.
The strongest attractive force in ethanoic acid is hydrogen bonding, which is caused by the polarizability of two oxygen atoms.
2CO2(g)2C6H6(l) + 15O2(g) - 12CO2(g) + 6H2O(g)2C6H6 If 0.200 mol N2 is reacted with 0.300 mol O2 to form NO, how much heat is produced or absorbed?
The metal that is easiest to oxidize is Pb, while the metal that is most difficult to oxidize is Zn.
The most probable values are 70 pm, 1402 kJ/mol86 pm, 898 kJ/mol135 pm, and 523 kJ/mol40 pm.
Under those conditions, which of the following acids will have the highest percentage?
HNO2HClO4H2SH3PO4CompoundFormulaNormalBoiling Point, Kn-heptaneC7H16371n-octaneC8H18398n-nonane It oxidizes many colored compounds and makes a good bleach.
AlH2SZnKMnO4Vitamin C can be used for oxidizers if chlorine isn't available.
It iscatalyzed by Cu2+ and Fe3+.
The reaction can be followed by measuring the ultraviolet absorbance.
A monoprotic acid with a molar mass of 248 g/mol is found to be a new compound.
The pH is measured when the acid is dissolved in water.
nitric acid has more oxygen atoms in its formula than nitrous acid, which makes it a stronger acid.
The photoelectron data for sodium is shown above.
Which of the following statements is true about the data?
All 11 electrons are shown in the table.
There are 9 valence electrons.
The 2s electrons have binding energies of 104 MJ/mol.
The conjugate acid-base pair of H3O+ and OH-H3PO4 and H3PO3HC2H3O2 can be identified.
NO2 + NO2 - NO3 + NO rate-limiting step.
The rate law for this mechanism is Rate = k [NO2]2.NO3(g) is an intermediate.
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.
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