Organic Chemistry Questions

Question 2 of 25 How can an unknown ΔHreaction be determined using Hess's law? A. The free energy of the reaction is used to determine the AH for the reaction. B. The unknown ΔHreaction is determined after the reaction is run in a calorimeter. C. The reaction is repeated at different temperatures to determine the ΔHreaction- D. Enthalpies from reaction steps are added to determine an unknown AHreaction

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

The density of iron is 7.874.Convert to kilogram per cubic meter. Do not include units in your answer. Provide your answer below:

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

This question is based on the following paragraph. The back yard was covered in late afternoon sunlight. The leaves danced in the trees, delighted that spring had finally arrived. The tulips were bright slashes of color like a child's crayon drawing. In the garden, the first green shoots were pushing out of the soil to greet the warmth of the sun. Sitting on the porch swing, I drank in the beauty of nature, a delicious treat. Which phrase from the paragraph is an example of a metaphor? A. Greet the warmth of the sun B. In late afternoon sunlight C. Delighted that spring had finally ved D. The beauty of nature, a delicious treat

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

Predict the products of the reaction below. That is, complete the right-hand side of the chemical equation. Be sure your equation is balanced and contains state symbols after every reactant and product. HCIO3(aq) + H2o ⇒ _

Identify areason that chemical reactions release energy during the reaction process. Select one: a. forming bonds b. breaking bonds c. storing energy d. overcoming activation energy

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

Methane and chlorine react to form chloromethane, CH3Cl, and hydrogen chloride. When 29.8 g of methane and 40.3 g of chlorine gas undergo a reaction that has a 64.7% yield, how many grams of chloromethane form? A)60.7 g B)44.4 g C)28.7 g D)18.6 g E)93.9 g

1.49 moles of hydrogen gas are reacted with excess carbon monoxide according to the reaction below. If 15.5 grams of methanol (CH₂OH) are produced, what was the percent yield? 2 H₂(g) + CO(g) → CH₃OH(l) (A) 59.1 % (B) 64.9 % (C) 68.5 % (D) 72.3 % (E) 79.19% (F) 45.9 %

Which experimental conditions would maximize the yield of choloroethane and minimize the production of polychlorinated products during the free radical chlorination of ethane? A. equimolar amounts of chlorine & ethane B. use an excess of chlorine C. excess of ethane D. excess of chlorine & long reaction time E. equimolar amounts of chlorine & ethane and high reaction temperature

Enthalpy change is the Select one: a. pressure change of a system at constant temperature. b. entropy change of a system at constant pressure. c. temperature change of a system at constant pressure. d. amount of energy absorbed or lost by a system as heat during a process at constant pressure.

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.

Identify each category of substance as soluble or insoluble in water. Salts of Group 1 elements Choose... Most nitrate salts Choose... Most carbonate and phosphate salts Choose... Most halide (Br, Cl, and I) salts Choose... Most silver salts Choose...

An aqueous solution at 25 °C has a pOH of 12.62. Calculate the pH. Be sure your answer has the correct number of significant digits.

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.

In the story of Icarus, the Exposition (establishing the setting and the conflict of the story) is A. the explanation that Icarus and his father are prisoners and want to escape. B. the detail of Icarus falling into the sea. C. the details of how Icarus' father made the special wings.

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 is the mass of potassium sulfate in 500 mL of a 1.25 M potassium sulfate solution? We know the volume (500 mL or 0.5 L) and we know the moles per liter, 1.25 M, but we need mass. Solution: • First, determine how many moles we have in solution: 125 x 0.500 L = 0.625 mol • Then, convert that amount to grams. To do this you must get the molar mass of K,SO, from the periodic table 174,3 g/mol. Use the number of moles you calculated above to find grams of potassium sulfate W 0.625 mol x 1743 g K, SO, mal K, 50, = 109 g K₂ SO4 Therefore, the mass of the K₂SO, that dissolves in 500 mL of H₂O to make this solution is 109 g. Solve this problem on paper, then submit your answer to see the solution: How many grams of Ca (OH), are needed to make 100.0 mL of 0.250 M solution?

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.

All BUT one action would increase the rate at which solid metal will react with an acid solution. That is Select one: a. decrease the molarity of the acid. b. break the metal into smaller pieces. c. increase the temperature of the solution. d. increase the concentration of the acid solution.

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)

A sample of a substance burns more rapidly in pure oxygen than in air. Which factor is most responsible for this high rate of reaction? Select one: a. concentration of the substance b. the properties of the reactants c. temperature d. surface area exposed to air Clear my choice

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.

In a chemical reaction, when particle size is reduced, the rate of reaction increases because of increased surface area of the reactants. Why would increased surface area increase reaction rate? Select one: a. It decreases the activation energy. b. It increases the number of collisions among particles. c. It decreases the temperature. d. It increases the concentration.

Be sure to answer all parts. Running at a rate of 7 mi/h uses 812 Calories in an hour. Convert this value to (a) J/h and (b) kJ/h. Report answers to appropriate number of significant figures.

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.

What is the net ionic equation of the reaction of ZnCl2 with NaOH? Express you answer as a chemical equation including phases.

Be sure to answer all parts. This question has two parts. Consider a 100. g sample of water. The specific heat of water is 1.00 cal/g °C) or 4.18 J/(g · °C). Part 1 out of 2 (a) How much energy, in calories, is released as the water is cooled from 55.0°C to 12.0°C? (Enter your answer in scientific notation.) Energy released = _ x 10 _ cal

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.

Some dry chemicals can be used to put out forest fires. One of these chemicals is NaHCO3. When NaHCO3(s) is heated, one of the products is CO₂(g), as shown in the unbalanced equation below. NaHCO3(s) + heat → Na₂CO3(s) + H₂O(g) + CO₂(g) A. Balance the above equation using smallest whole number coefficients. B. Identify the type of chemical reaction represented by the above equation. C. Draw a potential energy diagram to show that the above reaction is endothermic.

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.

What is entropy a measure of? A. The maximum potential energy of a system B. The change in energy of a reaction C. The disorder of a system D. The energy available to do work