General organic chemistry Questions and Answers

Draw the condensed structure of 1,2,5-pentanetriol.

Identify the components of the ionic formula based on the name nickel(III) sulfide. What is the symbol for the element that forms the positive cation?__ What is the symbol for the element that forms the negative anion?__ What is the subscript on the cation in the neutral formula?__ What is the subscript on the anion in the neutral formula?__

Which of the following shows that the combustion of methane produces 802 kJ/mol of energy? A. CH4(g) + 20₂(g) → CO₂(g) + 2H₂O(g) + 802 kJ/mol B. CH4(g) + 20₂(g) → CO₂(g) + 2H₂O(g) - 802 kJ/mol C. CH4(g) +202(g) + 802 kJ/mol → CO₂(g) + 2H₂O(g) D. CH₂(g) +20₂(g) → CO₂(g) + 2H₂O(g)

A chemist prepares a solution of barium acetate (Ba(C₂H₂O₂)₂) by measuring out 100. g of barium acetate 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 barium acetate solution. Be sure your answer has the correct number of significant digits.

Dilution A chemist must prepare 725. mL of 5.00 mM aqueous barium chlorate (Ba(ClO3)₂) working solution. She'll do this by pouring out some 49.9 mM aqueous barium chlorate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the barium chlorate stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits.

Question 3 of 10 Which of these statements about airplane and rocket flight is true? A. Only one requires combustion reactions to generate thrust. B. Only one must overcome the force of gravity. C. Only one requires both fuel and an oxidizer for the combustic reaction. D. Only one requires air molecules to generate lift.

Question 9 of 10 If an engineer's greatest concern is easy maintenance of a rocket throughout the years, the rocket should be designed to use which type of fuel? A. Liquid chemical fuel B. Gaseous fuel C. Nuclear fuel D. Solid chemical fuel

A chemist prepares a solution of zinc oxalate (ZnC₂O4) by measuring out 1.01 mg of zinc oxalate into a 100. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's zinc oxalate solution. Be sure your answer has the correct number of significant digits. _ mol/L _x10

Calculate the number of boron atoms in a 70.0 g sample of tetraborane (B4H10). Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits

What is ironic about this following passage? "So you're not killed, as you ought to be, but you're caught, anyway," he cried; "caught fast. Ho, what a jest, Ulrich von Gradwitz snared in his stolen forest. There's real justice for you!" A. Ulrich is caught, helpless in his own forest, as pointed out by Georg. B. Georg says, "So you're not killed." C. Justice is real.

A catalyst works by. Select one: a. changing the particle size of the reactants b. lowering the activation energy barrier c. shifting the equilibrium position toward the products d. changing the temperature of the reactants

Situational irony occurs when what is expected to happen is different from what actually happens. From the highlighted passage in Sec. 33, we expect that... A. They are seeing things because they have been trapped for so long. B. Some foresters are coming to their rescue. C. The men's cries won't be heard and they will be passed by.

What drives spontaneous reactions? Select one: a. increasing enthalpy and increasing entropy b, increasing enthalpy and decreasing entropy c. decreasing enthalpy and decreasing entropy d. decreasing enthalpy and increasing entropy

Question 1 of 10 When is a secondary source more helpful than a primary source? A. When you are an expert in the field being studied in the experiment B. When you want all the details of the experiment C. When you want a quick summary of the experiment D. When you want to perform the experiment yourself

Which situation is the best example of irony? A. The map showed me where to go to get to my destination. B. I got extremely thirsty while swimming in the pool. C. Her family photo album has pictures of her family and also all of her friends.

Which is the best summary of paragraph 8 of "The Lady, or the Tiger?" A. The crowd likes to see someone be punished. They come often to the arena. B. The crowd was usually at a hilarious wedding. C. The surprise verdict makes the arena popular. Because the choice is the accused's, it seems just.

Which of the following is the of best summarization paragraphs 23 and 24? A. The princess is weighing her options. B. The princess is wondering where her lover is. C. The princess is waiting for something to happen.

Question 5 of 10 How is heat transferred from one object to another? A. Heat moves from warmer objects to cooler objects. B. Heat moves between objects of the same temperature. C. Heat moves back and forth between two objects. D. Heat moves from cooler objects to warmer objects.

A chemist prepares a solution of copper(II) sulfate (CuSO4) by measuring out 51. g of copper(II) sulfate into a 400. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's copper(II) sulfate solution. Be sure your answer has the correct number of significant digits.

The lab you have been assigned in chemistry class asks you to mix two chemicals together to create a chemical reaction. You do not have much time to complete the lab. Which of these would help speed up the reaction rate? Select one: a. put the chemicals on a ice bath b. carefully heat the chemicals on a hot plate c. do not add the supplied catalyst to the reaction d. add more solvent to the chemicals in order to lower their concentration

What volume of a 5.50 M solution of NaNO3 do you need to make 0.495 L of a 1.00 M solution of NaNO3? Express the volume to three significant figures and include the appropriate units.

Calculate the mass of camphor (C₁0H₁60) that contains a trillion (1.0 × 10¹2) carbon atoms. Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits.

Calculate the mass of forsterite (Mg₂SiO4) that contains a billion (1.0 × 109) magnesium atoms. Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits.

Which of the following chemical equations is balanced correctly? A. Zn(s) + 2AgNO3(aq) → 2Ag(s) + Zn(NO3)2(aq) B. CH₂OH(1) + 20₂(g) → CO₂(g) + 2H₂O(1) C. H₂SO4(aq) + 2NaOH(aq) → Na₂SO4(s) + H₂O(l) D. 2Al(s) + 302(g) → Al₂O3(s)

Which sentence uses the underlined vocabulary word incorrectly? A. I filled out the acquiesce for the insurance company. B. Tom's pain and his languor let us know he hadn't completely recovered from his surgery yet. C. The two angry men could not shake hands and come to a reconciliation in a timely manner.

Based on the second definition given, which sentence most correctly uses the word academic as "assumed, a known procedure"? A. My parents reward me for my academic progress -- my grades in school. B. An athlete should consider a college's academic program as well as its sports program. C. Getting candy by throwing a fit has become academic for the child whose mother gives in.

Is pentene (Molecular formula: C5H10) saturated, mono- unsaturated, or poly-unsaturated. Hint: Draw the Lewis structure Mono-unsaturated Poly-unsaturated Saturated Depending on how it is drawn, it could be any of the choices.

How does describing the princess's conflicting feelings build the tension and the action? A. It doesn't - the author should have described her clothes and her hair color to build the action. B. It makes the conflict seem real and leaves the reader anxious to know what happens at the climax. C. The author should have described what the king felt - he wasn't worried about what would happen.

The thermochemical equation for the reaction of carbon dioxide with sulfur dioxide is shown below. How can the reaction be described? CO₂(g) +2SO₂(g) +1104 kJ → CS₂(g) +30₂(g) A., It has a low activation energy. B. It is exothermic. C. It has a high activation energy. D. It is endothermic.

How much energy in kilocalories is needed to vaporize 185 g of water? The heat of vaporization of water is 540 cal/g. kcal

Select the single best answer. Which of the following samples has the higher final temperature? 12.0 g of aluminum at 18°C that absorbs 95.0 cal of heat 16.0 g of iron at 22°C that absorbs 55.0 J of heat

What is ironic about the following passage? 41- "No," said Ulrich with a laugh, the idiotic chattering laugh of a man unstrung with hideous fear. 42- "Who are they?" asked Georg quickly, straining his eyes to see what the other would gladly not have seen. 43- "Wolves." A. The men were finally ready to end their feud when their feud resulted in the end of them. B. Georg was too blind to see their fate. C. The men had traveled in packs just like the wolves

If 75 kJ of heat is transferred to 1200 g liquid water at 36°C, what would the new temperature of the water be? (The specific heat capacity of liquid water is 4.186 J/g °C.) A. 15°C B. 51°C C. 100°C D. 36°C

Aweather balloon has a volume of 52.5 liters at a temperature of 295 K. The balloon is released and rises to an altitude where the temperature is 252 K. A. How does this temperature change affect the gas particle motion? Explain. B. The original pressure at 295 K was 100.8 kpa and the pressure at the higher altitude at 252 K is 45.6 kpa. Calculate the volume of the balloon at the higher altitude.

Consider the following elements: Sodium, Carbon, Calcium, Fluorine, Oxygen. A. Name two elements that would form an ionic compound. B. Write the correct formula of an ionic compound that could be formed by the elements you gave in part (A). C. Give the correct name of the ionic compound you wrote in (B). D. Propose an experimental test you can perform to prove that the compound you wrote in (B) is ionic. E. Name an element from the above list that conducts electricity in solid state. Justify.

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)

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?

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?

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?

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

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