Question 1

Which of the following best describes an alkane?

Accepted Answer

A hydrocarbon with only single covalent bonds between its carbon atoms.

Question 2

What is the general formula for a straight-chain alkane?

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n+2}$$

Question 3

Which of the following is a structural isomer of butane ($$\mathrm{C}_4\mathrm{H}_{10}$$)?

Accepted Answer

Methylpropane

Question 4

A hydrocarbon with the formula $$\mathrm{C}_6\mathrm{H}_{14}$$ can have how many structural isomers?

Accepted Answer

5

Question 5

Which property of alkanes makes them useful as lubricating materials?

Accepted Answer

Their chemical inertness at room temperature

Question 6

What is the main intermolecular force present in alkanes?

Accepted Answer

Van der Waals forces

Question 7

Which of the following best explains why the boiling point of alkanes increases with chain length?

Accepted Answer

Longer chains have greater surface area, leading to stronger van der Waals forces.

Question 8

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$$?

Accepted Answer

Heptane

Question 9

Which of the following statements about alkyl halides is correct?

Accepted Answer

They have higher boiling points than the corresponding alkanes due to increased polarity.

Question 10

A chemist burns equal moles of ethane, pentane, nonane, and dodecane. Which produces the largest volume of $$\mathrm{CO}_2$$?

Accepted Answer

Dodecane

Question 11

Which of the following best describes the process of fractional distillation?

Accepted Answer

Separation of hydrocarbons based on their boiling points

Question 12

Which of the following is the correct condensed formula for octane?

Accepted Answer

$$\mathrm{CH}_3(\mathrm{CH}_2)_6\mathrm{CH}_3$$

Question 13

Which of the following is a correct name for a cyclic alkane with six carbon atoms and two methyl groups on carbons 1 and 3?

Accepted Answer

1,3-dimethylcyclohexane

Question 14

Which of the following best explains why water does not mix with liquid hydrocarbons?

Accepted Answer

Hydrocarbons are non-polar, while water is polar.

Question 15

Which of the following is the correct name for the compound with the structure $$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$$?

Accepted Answer

Hexane

Question 16

Which of the following is a real-world application of propane, as shown in the study materials?

Accepted Answer

Fuel for soldering torches

Question 17

What is the main environmental concern associated with the combustion of alkanes?

Accepted Answer

Release of $$\mathrm{CO}_2$$ contributing to global warming

Question 18

Which of the following is the correct IUPAC name for a compound with a 10-carbon chain and methyl groups on carbons 2 and 3?

Accepted Answer

2,3-dimethyldecane

Question 19

Which of the following is a correct description of an alkyl group?

Accepted Answer

A group of one or more carbon atoms that forms a branch off the main chain of a hydrocarbon

Question 20

Which of the following is a correct equation for the complete combustion of butane?

Accepted Answer

$$2\ \mathrm{C}_4\mathrm{H}_{10} + 13\ \mathrm{O}_2 \rightarrow 8\ \mathrm{CO}_2 + 10\ \mathrm{H}_2\mathrm{O}$$

Lesson 1.1: Alkanes: Structure, Properties, and Nomenclature

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