Organic Chemistry Questions

According to the definitions given, which is the correct use of the word novel as an adjective? A. Wyatt came up with the novel idea of having a talk show just for students. B. This book about Abraham Lincoln is a very interesting novel. C. Something that everyone already knows or is doing is called novel.

Through what process is heat transferred between the warm air in front of a fireplace and the cooler air on the other side of the room? A. Radiation B. Convection C. Conduction D. Absorption

Indicate whether heat is absorbed or released in each process. a. melting 500 g of ice: (select) b. freezing 11 g of water: (select) c. condensing 70 g of steam: ((select) d. vaporizing 50 g of water: (select)

Be sure to answer all parts. Carry out the following conversion. Report answers to appropriate number of significant figures. a. 354 kcal to kJ b. 11.7 kcal to J kJ J

Which of the following sources is considered to be most reliable for scientific information? A. Criticism of a journal article B. A science encyclopedia C. A conference paper that reports research D. Laws regulating science

Be sure to answer all parts. Combustion of 1 g of liquid hydrogen releases 33.6 kcal of energy. How many kilojoules of energy are released? How many joules does this correspond to? Report answers to appropriate number of significant figures. kJ J

A lead strip is placed in a copper(II) sulfate solution. a) List all the entities present in the mixture. b) Identify all OA's and RA's. c) Does a redox reaction occur and, if it does what is the reaction equation?

What is the change in enthalpy of the first reaction below, given the enthalpies of the other two reactions? 2NO₂(g) →2NO(g) + O₂(g) N₂(g)+0₂(g) → NO(g) N₂(g) +O₂(g) → NO₂(g) ΔH°-90 kJ/mol ΔH-34 kJ/mol A. -112 kJ B. 112 kJ C. 248 kJ D. -56 kJ

Consider the following reaction: 4 PH3(g) + 8 0₂ (g) ---> P4010 (s) + 6 H₂O (g) a. What is the theoretical yield of tetraphosphourous decoxide, P4010, if 28.5 g of phosphine, b. What is the percentage yield of P4010, if the actual yield is 49.0 g ? PH3, reacts with oxygen?

Which statement explains why a strip of sulfur is a better electrical insulator than a strip of silicon? A. Sulfur atoms have more protons than silicon atoms. B. Sulfur atoms allow fewer electrons to move between atoms than silicon atoms do. C. Sulfur atoms allow more electrons to move between atoms than silicon atoms do. D. Sulfur atoms have fewer protons than silicon atoms.

Questions (Answer in complete, full sentences. Limit yourself to the available space.) 1. Using your knowledge of this reaction, sketch an energy profile diagram for the reaction. In your diagram, clearly label the axes, structures of reactants, structures of products, activation energy (E₂), transition state structure, and AH.

Based on the data table, one scientist concludes that the mass of AgCl formed depends only on the amount of HCI added, and another scientist concludes that the mass of AgCl formed depends on the amount of the limiting reactant. How might this conflict be resolved? A. Explain the reasoning of each scientist to the other scientist. B. Compare the solubilities of the reactants and the precipitate. C. Read other lab reports that describe what takes place during this reaction. D. Perform further investigations using different amounts of reactants. -

Consider the combustion of benzene; 2C6H6(l) + 1502(g) à 12CO₂(g) + 6H₂O(l) if 20.0 g of benzene and 20.0 g of O₂ reacts together according to the above reaction: • identify the limiting reagent. • how many grams of the excess reagent will remain unused?

For scuba dives below 150 ft, helium is often used to replace nitrogen in the scuba tank. If 14.7 g of He(g) and 28.0 g of O₂(g) are added to a previously evacuated 5.35 L tank at 20.°C, calculate the partial pressure of each gas present as well as the total pressure in the tank. Partial pressure of He Partial pressure of 02 Total pressure = atm atm atm

Why does Hess's law allow you to determine the enthalpy change of a reaction? A. It states how the equilibrium constant is related to the enthalpy change. B. It states that the change in enthalpy depends on the reaction pathway between the products and the reactants. C. It states that the change in enthalpy is independent of the pathway the reaction takes to get to the products. D. It states that the enthalpy of any reaction can be determined using a bomb calorimeter.

Which statement best describes what happens as thermal energy from the sun warms the pavement? A. The thermal energy that is not absorbed by the pavement is destroyed. B. The thermal energy absorbed by the pavement is destroyed. C. Some thermal energy is absorbed by the pavement, and some is destroyed. D. The thermal energy of the sun is transferred to the pavement.

Enter your answer in the provided box. Carry out the following conversion. Report answers to appropriate number of significant figures. 32.9 kcal to cal cal

What is the best definition of the enthalpy of formation, AH? A. The energy released when products form in a reaction B. The energy absorbed when products form in a reaction C.' The energy required for an atom to form from its subatomic particles D. The energy required for a molecule to form from its elements

The temperature of 500 mL of water is 16°C. What happens to the water when thermal energy is transferred to it? A. The volume of the water increases because thermal energy increases as volume increases. B. The temperature of the water increases because the average kinetic energy of the water molecules increases. C. The volume of the water decreases because thermal energy decreases as volume decreases. D. The temperature of the water decreases because the average kinetic energy of the water molecules decreases.

Is pentane (Molecular formula: C5H12) saturated, mono- unsaturated, or poly-unsaturated. Hint: Draw the Lewis structure Saturated Mono-unsaturated Depending on how it is drawn, it could be any of the choices. poly-unsaturated

A box has volume of 4.75 x 1018 μm³ (cubic micrometers). What is the volume of the box in cubic feet (ft³)? 2.54 cm = 1.00 inch; 12.00 inches = 1.00 foot 1.68 x 1011 ft³ 1.55 x 1013 ft³ 2.87 × 1017 ft³ O 1.87 × 106 ft³ 168 ft³

Acid 1 has a pKa value of +6. Acid B has a pKa value of -2. Which statement below is accurate? Acid B is 100,000,000 times weaker than acid A. Acid B is 80 times stronger than acid A. Acid B is 100,000,000 times stronger than acid A. Acid B is 80 times weaker than acid A. Acid B is 8 times stronger than acid A. Acid B is 8 times weaker than acid A.

The primary structure of a protein involves which of the following? a. Van der Waals forces b. hydrogen bonds c. hydrophilic forces d. peptide bonds e.disulfide bonds

A 1.28 mol sample of Xe gas is confined in a 31.1 liter container at 23.3 °C. If the amount of gas is decreased to 0.640 mol, holding the volume and temperature constant, the pressure will decrease because: Choose all that apply. With lower average speeds, on average the molecules hit the walls of the container with less force. With fewer molecules in the container, the molecules have lower average speeds. As the number of molecule-wall collisions increases, the force per collision decreases. With fewer molecules per unit volume, the molecules hit the walls of the container less often. None of the Above

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

During a test trial, the control and test group are both given a pill. To account for the effect patients may think the drug being tested is having just because they believe they're being treated, the control group is given a "sugar pill," which is called what? A. screening tool B. placebo C. drug D. medicine

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.

A sample of neon gas at 302 K and 0.565 atm occupies a volume of 4.91 L. If the pressure of the gas is decreased, while at the same time it is heated to a higher temperature, the final gas volume will be larger than 4.91 L. could be larger or smaller than 4.91 L depending on the final pressure and temperature. will be smaller than 4.91 L.

The reaction of CH3CH=CH-CH=CH₂ with excess bromine gives chiefly a. 1,2-dibromo-3-pentene b. 3,4-dibromo-1-pentene C. 1,4-dibromo-2-pentene d. a mixture of the above three compounds e. none of the above three compounds

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

You would like to make a solution that 38.8 L of a 2.9 M solution. You have a stock solution that is 9 M. How much your stock solution will you need to dilute to get the solution you want? Just the number!

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

According to Le Châtelier's principle, how would a change in pressure affect a gaseous system in equilibrium? A. The equilibrium would shift to reduce the pressure change. B. The number of both reactants and products would increase. C. The equilibrium would shift in the direction of the change. D. All equilibrium interactions would stop.

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.

A young scientist wants to focus on drug creation. What is one of the first things he should do? A. Test a composite material in the lab to see how it can be improved. B. Look into trends of various diseases and their effects on society. C. Research available drugs for treating illnesses such as cancer and heart disease, as well as the side effects of these drugs. D. Make a plan for how to conquer a disease with drugs.

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