Question 1

The image shows a flambé cooking technique. Which property of alcohols makes flambé possible?

Accepted Answer

Alcohols are flammable due to their ability to combust in the presence of oxygen.

Question 2

Which of the following best explains why ethanol is used in flambé cooking?

Accepted Answer

Ethanol is flammable and burns with a visible flame, making it suitable for flambé.

Question 3

Which intermolecular force is primarily responsible for the higher boiling point of alcohols compared to alkanes?

Accepted Answer

Hydrogen bonding

Question 4

Which of the following reactions describes the combustion of ethanol, as used in flambé?

Accepted Answer

$$2 \mathrm{C_2H_5OH}(l) + 6 \mathrm{O_2$}(g) \rightarrow 4 \mathrm{CO_2$}(g) + 6 \mathrm{H_2O}(g)$$

Question 5

Why are alcohols, such as ethanol, more soluble in water than alkanes of similar molecular mass?

Accepted Answer

Alcohols can form hydrogen bonds with water molecules.

Question 6

Which of the following statements about the flammability of alcohols is correct?

Accepted Answer

Alcohols are flammable because they can combust in oxygen to produce carbon dioxide and water.

Question 7

Which of the following best describes the role of ethanol in the flambé process shown in the image?

Accepted Answer

Ethanol provides the fuel that combusts to produce the visible flame.

Question 8

Which of the following is a product of the complete combustion of ethanol during flambé?

Accepted Answer

Carbon dioxide

Question 9

If a beverage is labeled as '100 percent proof,' what does this indicate about its ethanol content?

Accepted Answer

It contains at least 57% ethanol by volume.

Question 10

Which of the following best explains why the proof test for alcoholic beverages involved igniting gunpowder soaked in the beverage?

Accepted Answer

To determine if the beverage contained enough ethanol to be flammable.

Lesson 1.4: Alcohols, Ethers, and Thiols: Structure, Properties, and Reactions

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