General organic chemistry Questions and Answers

A new drug has been released to the public and is popular among consumers. It is effective in relieving high blood pressure. However, it has altered some patients' personalities. Which stage of the engineering process may address this negative side effect? A. Screening B. Looking for improvements C. Testing D. Evaluating test results

A 6.9 L balloon is filled with water at 3.16 atm. If the balloon is squeezed into a 3.18 L beaker and does NOT burst, what is the pressure of water in the balloon? a. 6.86 b. 1.46 c. 69.3 d. 0.0789

How much heat must be transferred to 55 g of ice to change the ice's temperature from -13°C to -5.0°C? (The specific heat capacity of ice is 2.11 J/g °C.) A. 930 J B. 15 J C. 580 J D. 3.3 J

Ethanoic acid (vinegar) when diluted to low concentrations by water can be prepared from ethene by a. reduction with H2, followed by reaction with a strong oxidizer b. addition of HCl, followed by reaction with H₂O c. addition of H₂Ofollowed by reaction with a strong oxidizer d. addition of Br2, followed by reduction with H₂

A sample of carbon dioxide gas at 292 K and 0.838 atm occupies a volume of 1.70 L. If the gas is compressed into a smaller volume, while at the same time it is cooled to a lower temperature, the final gas pressure will be lower than 0.838 atm. will be higher than 0.838 atm. could be higher or lower than 0.838 atm depending on the final volume and temperature.

When CH4 is reacted with excess Cl₂(g) in the presence of light, the reaction mixture contains which of the following? a. CH3Cl b. CH₂Cl₂ c. CH3C1, CH₂Cl2, CHCl3 d. CHCl3

Which of the following gas samples would have the largest volume, if all samples are at the same temperature and pressure? 1.33 moles CH4 8x1023 molecules of H₂ 53.09 grams of Ar they would all have the same volume

The engineering process defines the steps engineers take to create technology. Which of these describes these steps in the correct order? A. Identifying a problem, making a solution, testing the solution, mass production, making improvements B. Identifying a problem, testing various solutions, researching side effects of each solution, choosing a solution, looking to improve the solution, planning how to test the solution C. Identifying a problem, brainstorming solutions, researching the background of each solution, testing solutions, choosing a solution, production, making future improvements Stery D. Identifying a need, researching the background of that need, making a plan to meet the need, doing the work, evaluating the results, looking for improvements

A sample of nitrogen gas had a volume of 500. mL, a pressure in its closed container of 740. torr, and a temperature of 25.0 °C. What was the new volume of the gas when the temperature was changed to 50.0°C and the new pressure was 760. torr? 976 mL 452 mL 528 mL 244 mL

The prefix "heptyl" corresponds to: a carbohydrate side-chain with seven carbons in a straight link. a hydrocarbon side-chain with seven carbons in a straight link none of the above. a hydrocarbon side-chain with seven carbons with any arrangement. a hydrocarbon with seven carbons

The acid dissociation constant, K₂, of HNO3 is 4.0 x 104. What does the Ka value indicate about this compound? A. HNO3 is a strong acid. B. HNO3 is a strong base. C. HNO3 is a weak acid. D. HNO3 is neither an acid nor a base.

A scientist wants to make advances in the way skin cancer patients are treated. What is something she should do first? A. Study the side effects of her new treatment. B. Test people who use sunscreen to see if it actually prevents sunburns. C. Interview people at beaches to see how they feel about sunscreen. D. Look at the success rate of the current treatments.

Cu(s) + 2AgNO3(aq) Cu(NO3)2(aq) + 2Ag(s) How many grams of excess reactant do you have if you react 221 grams of Cu with 575 mL of a 3.1 M AgNO3 solution? Molar masses: Cu = 63.546 g/mole; AgNO3= 169.87 g/mole; Cu(NO3)2= 187.56 g/mole; Ag = 107.868 g/mole The Limiting Reagent is Therefore will remain and its excess is

What is represented at the triple point of water? A. Solid, liquid, and gas phases in equilibrium B. Solid, liquid, and gas molecules no longer interacting C. Solid, gas, and vapor molecules changing into each other D. Solid, liquid, and supersaturated solution in equilibrium

Sound travels at a velocity of 333 meters per second. How long does it take for sound to travel the length of a 100 yard football field? How long does it take for the sound to travel the length of the football field? 0.275 s 0.28 s 0.27459 s 0.27 s 0.2746 s

What is Keq for the reaction N₂ + 3H₂ = 2NH3 if the equilibrium concentrations are [NH3] = 3 M, [N₂] = 1 M, and [H₂] = 2 M? A. Keq = 4.5 B. Keq B. Keq = 1.5 C. Keq = 1.125 D. Keg = 0.75

The reaction below is at equilibrium. What would happen if more Na2O2 were added? 2Na(s) + O₂(g) → Na₂O₂ (s) A. The equilibrium position would shift to produce more Na202. B. The equilibrium position would shift to produce more 02. C. The equilibrium position would shift to produce more Na2 and 0₂. D. The equilibrium position would stay the same.

Which of the following characterizes a reaction at equilibrium? A. The forward reaction stops, and the backward reaction starts. B. The reactants are changed into products. C. The forward and backward reactions stop happening. D. The rates of the forward and backward reactions are equal.

Which statement about muckraking journalism is correct? Select the best answer from the choices provided. A. It was a feature of the Progressive Movement. B. It investigated corruption, scandals, and corporate crime. C. Ida B. Wells's investigation of lynching is a good example. D.All answers are correct.

Draw the structure of a tripeptide "ADK" at physiological pH. What would be the net charge on this molecule at this pH?

Which of these is a significant ethical dilemma that a drug designer may face? A. A new drug effectively fights allergies but causes drowsiness. B. A new drug effectively treats skin cancer but may cause minor skin rashes during treatment. C. A new drug effectively lowers blood pressure but may cause headaches. D. A new drug treats hypothyroidism but destroys the thyroid; this means that patients will be on the drug indeterminately.

What is the difference between science and pseudoscience? A. Science is based on observation, while pseudoscience is based on experimentation. B. Pseudoscience is based on observation, while science is based on experimentation. C. Pseudoscientific conclusions are based on empirical evidence, while scientific conclusions are not. D. Scientific conclusions are based on empirical evidence, while pseudoscientific conclusions are not.

What does Le Châtelier's principle state? A. A reaction at equilibrium will go to completion when the equilibrium is upset. B. A reaction will form a new equilibrium ratio when the equilibrium is upset. C. A reaction at equilibrium will respond to balance a change. D. A reaction at equilibrium will not respond to a change.

You would like to make 3.1 L of a NaCl solution that has a concentration of 2.8 M. How many grams of salt (NaCl) will you need to make your solution?

The process of using computers and robots to conduct thousands of tests to determine the interaction between different compounds and a disease is called what? A. Evaluating test results B. High-throughput screening C. An intravenous solution D. The engineering process

A scientist has just developed a composite drug to fight seasonal allergies. What's the next step in the engineering process before the drug is released? A. Analyzing the strengths and weaknesses of each drug currently on the market B. Determining if any other diseases might also benefit from this composite drug C. Researching how each drug has been used in the past D. Testing the composite drug in a trial run.

(Ba(C₂H₂O₂)₂) working solution. She'll do this by pouring out some 0.484 M A chemist must prepare 250. mL of 475. mM aqueous barium acetate aqueous barium acetate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the barium acetate stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits.

You determine the empirical formula of a compound to be CH3. In a separate experiment, you determine the molar mass of the compound to be 90.208 g/mol. What is the molecular formula for this compound? (When entering your answer, you do not need to use subscripts - for example, you could write C1202 for the empirical formula Cl₂0₂.)

A solution of ammonia NH3(aq) is at equilibrium. How would the equilibrium change if OH- were added to the solution? A. [NH4+] and [OH-] would increase. B. [NH4+] and [OH-] would decrease. C. [NH4+] and [H*] would decrease. D. [NH4+] would increase and [OH-] would decrease.

A chemist prepares a solution of magnesium bromide (MgBr₂) by measuring out 0.90 g of MgBr₂ into a 100 mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Br anions in the chemist's solution. Be sure your answer is rounded to the correct number of significant digits.

A chemist adds 410.0 mL of a 3.7 x 10-5 mol/L mercury(II) iodide (Hgl₂) solution to a reaction flask. Calculate the micromoles of mercury chemist has added to the flask. Be sure your answer has the correct number of significant digits.

Draw the skeletal ("line") structure of pentane.

A chemist prepares a solution of vanadium(III) chloride (VC13) by measuring out 0.12 g of VCI3 into a 300. mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of C1 anions in the chemist's solution. Be sure your answer is rounded to the correct number of significant digits.

A chemist dissolves 230. mg of pure hydrochloric acid in enough water to make up 350. mL of solution. Calculate the pH of the solution. Be sure your answer has the correct number of significant digits.

Gasecus ammonia chemically reacts with oxygen (0.) gas to produce nitrogen monoxide gas and water vapor. Calculate the moles of nitrogen monoxide produced by the reaction of 2.10 mol of oxygen. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.

Calculate the volume in milliliters of a 0.527M aluminum sulfate solution that contains 425. mmol of aluminum sulfate (Al₂(SO4)3).

Write the systematic name of each organic molecule: structure CH3 CH2CH₂CH2CH₂CH₂- -CH2CH2CH₂CH₂CH₂CH3 CH3CH₂CH₂CH₂CH₂CH₂CH₂CH₂CH3 CH3CH2CH3

A chemist dissolves 191. mg of pure perchloric acid in enough water to make up 80. mL of solution. Calculate the pH of the solution. Be sure your answer has the correct number of significant digits.

An aqueous solution at 25 °C has a H₂O+ concentration of 6. × 10 M. Calculate the OH concentration. Be sure your answer has the correct number of significant digits.

An aqueous solution at 25 °C has a OH concentration of 2.7 x 10 M. Calculate the H₂O concentration. Be sure your answer has the correct number of significant digits.

2. How satisfied do you think the founding fathers would be with the way that the Constitution has evolved and been used overtime? Be sure to consider issues of the President's power over war, the size of the national government and the protection of civil liberties.

One of the challenges astronauts face is in space travel is the build-up of carbon dioxide in their spacecraft. The average human exhales about 42.0 of carbon dioxide per hour. One method to remove the excess carbon dioxide from the air is using solid lithium hydroxide: CO2(g) + 2 LiOH(s) Li₂CO3(2) H₂O(1) If a typical cannister of LiOH contains 750.0 g, how many hours will it last for one person before it has to be replaced? (6 marks): (I)

Be sure to answer all parts. Answer the following questions about the molecule Cl₂O. a. How many valence electrons does Cl₂O contain? _ valence electrons

Be sure to answer all parts. Rank the atoms in each group in order of increasing electronegativity. a. Ge, C. Si (select) b. N. Si, C

Metals that can form cations with variable charge are typically found in which of the following areas of the periodic table? Check all that apply. Group 4A Group 7A Transition metals Group 2A

A chemist prepares a solution of mercury(I) chloride (Hg₂Cl₂) by measuring out 0.275 mg of mercury(1) chloride into a 250. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's mercury(I) chloride solution. Be sure your answer has the correct number of significant digits.

A chemist prepares a solution of aluminum chloride (AICl3) by measuring out 15. g of aluminum chloride into a 50. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's aluminum chloride solution. Be sure your answer has the correct number of significant digits.

A chemist prepares a solution of potassium permanganate (KMnO4) by measuring out 26. µmol of potassium permanganate into a 400. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in μmol/L of the chemist's potassium permanganate solution. Be sure your answer has the correct number of significant digits.

Given the following balanced equation, determine the rate of reaction with respect to [Cl 2]. If the rate of Cl 2 loss is 4.00 x 10 what is the rate of formation of NOCI? 2 NO(g) + Cl 2(g) → 2 NOCI(g) 7.25 x 10-2 M/s 1.00 × 10-1 M/s 4.00 × 10-2 M/s 8.00 × 10-2 M/s 2.00 × 10-2 M/s

The electronic configurations of neutral atoms are given. Match each electronic configuration of the neutral atoms with the charge of its monatomic ion. 1s2 2s1 1s2 2s2 2p5 1s2 2s2 2p6 3s2 Drag statements on the right to match the left. +1 -1 +2