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.
An experiment was performed to determine the moles of carbon dioxide gas formed when an acid reacts with limestone.
A piece of limestone was weighed.
The limestone disappeared after carbon dioxide was collected.
The pressure was measured at 1.065 atm.
The temperature was 295 K and the volume of CO2 was measured to the nearest mL.
The student got low results.
Limestone is not a pure form of CaCO3.Carbon dioxide is not a pure form of water.
Point A is absolute zero, point C is proportional to temperature, and point D is the transition state.
Your supervisor wants to know the enthalpy of a chemical reaction.
A 25 g sample of a solid was heated to 100degC and quickly transferred to an insulated container holding 100 g of water.
The final temperature of the mixture was 37degC.
The sample lost more thermal energy than the water did because the sample temperature changed more than the water did.
Three 1-liter flasks are connected to a 3-liter flask by valves.
The relative number of helium atoms is indicated by the 3-liter flask.
Oxygen, hydrogen, and nitrogen are contained in the first, second, and third flasks.
The pressure of hydrogen is low.
The number of gas molecules is determined by the representations in the flasks.
The mass spectrum of a naturally occurring sample of an element is shown above.
There are two peaks, so there must be two compounds.
Which sequence lists the corresponding cations in order of increasing acid strength?
Which of the following acids is the best choice?
A student uses a pH indicator.
The observed color change will be distinct, and the calculated molarity of the base will be accurate, which characterizes the expected observations based on the titration curve above.
When preforming a titration of 0.050 M benzoic acid, C6H5COOH, which of the following indicators would be the best choice?
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.
If you use the data in the graph, which of the solutions does not have an acid dissolved in water?
We can't tell, we need to know what the anions are.
The underlying structure of a substance is often ascribed to by chemists.
It is almost as brittle as a diamond.
In the diagram above, which labeled arrow is pointing toward a covalent bond and which is pointing toward a hydrogen bond, is the solid state structure of Silicon carbide.
Which sample has the lowest density since the temperatures are the same in all vessels.
Which attractive force causes the condensation of the three compounds in the table above?
All of the statements about this molecule are true, except for the fact thatulfur trioxide has a non-polar S-O bond order.
The charges should be minimized.
The sulfite ion has a double bond and a triangular pyramid shape.
The hydrogen in butanoic acid is at the end of the formula and has the weakest bond to the rest of the molecule.
rancid butter is given a foul smell by butanoic acid C4H8O2.
The Ka is 1.5 x 10-5.
If a 0.0100 M solution of butanoic acid is prepared, the expected pH will be in one of the following ranges.
The information and graph below show the approximate molar solubility of thallium chloride within a factor of 10.
SO3(g) is formed in the atmosphere through the equation above.
A sample of SO3(g) is placed into a container.
The SO3(g) has a pressure of 760 torr.
The system reaches equilibrium when the temperature is held constant.
The pressure of the system is shown in the figure.
The pressure should decrease since three moles of gas are producing two moles in the reaction.
The pressure versus time curve can be used to determine the rate law for the reverse reaction, the rate law for the forward reaction, and the enthalpy of the gas phase reaction.
Why are SO2(g) and SO3(g) pollutants concerned about?
They contain yellow sulfur that causes jaundice, which is a major part of acid rain.
The boiling point of chlorine is at 239 K, while fluorine has a normal boiling point of 85 K. The F2 electron clouds are more polarizable than the Cl2 electron clouds, so which is the best reason for the large difference in boiling points?
There are representations of carbon tetrachloride in space.
The bromine hides the carbon in the carbon tetrachloride.
A standard state chemical system has all concentrations at 1 M. Which of the following is false if the cell potential is +0.500 V?
The reaction is thermodynamically favored, and the concentrations of the products increase.
What is the cell diagram for the cell above?
Based on the information above and your knowledge of periodic trends, which values are the most reasonable for the first ionization energy of the magnesium atom?
HNO2 > H2CO3 > H3PO4HClO4 > HNO2 > H2CO3 > H3PO4H2CO3 0.25 mol of monoprotic acid is dissolved in 0.25 L of distilled water.
The measured pH was 4.26.
Sulfurous acid is a weak acid because the O-H bonds in sulfuric acid are weaker than in sulfurous acid.
H3O+ and OH-H3PO4 and H2PO4-HClO4 and ClO3-SO32- and HSO2 are conjugate acid-base pairs.
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.