$$C_6H_{12}O_6$ molar mass = (6$$ \times 12.0) + (12 \times 1.0) + (6 \times 16.0) = 180.0$$ g/mol.\n0.50$ mol $$\times$$ 180.0$ g/mol = 90.0$ g.

Question 1

Which of the following statements best describes Avogadro’s number?

Accepted Answer

It is the number of particles in 1 mole of a substance, equal to $$6.022 	imes 10$$^{23}$$.

Question 2

Calculate the mass in grams of 0.50 moles of glucose ($$C_6H_{12}O_6$). (Atomic masses: C = 12.0, H = 1.0, O = 16.0)

Accepted Answer

$$C_6H_{12}O_6$ molar mass = (6$$ 	imes 12.0) + (12 	imes 1.0) + (6 	imes 16.0) = 180.0$$ g/mol.
0.50$ mol $$	imes$$ 180.0$ g/mol = 90.0$ g.

Question 3

Which of the following compounds is an example of a saturated hydrocarbon?

Accepted Answer

Hexane

Question 4

How many hydrogen atoms are present in one molecule of cyclopentane ($$C_5H_{10}$$)?

Accepted Answer

10

Question 5

Which of the following is a correct IUPAC name for the compound with the structure: $$CH_3CH_2CH(Cl)CH_3$?

Accepted Answer

2-chlorobutane

Question 6

Which of the following best distinguishes a primary alcohol from a secondary alcohol?

Accepted Answer

A primary alcohol has the $$-OH$$ group attached to a carbon bonded to only one other carbon.

Question 7

Which of the following is a structural isomer of butane ($$C_4H_{10}$$)?

Accepted Answer

2-methylpropane

Question 8

A reaction has $$\Delta H = -150 kJ $$and $$\Delta S = +200 J/K. At 298 K$$, what can you predict about the spontaneity of the reaction?

Accepted Answer

The reaction is spontaneous because $$\Delta G is $$negative.

Question 9

Which of the following best describes the effect of a catalyst on a chemical reaction?

Accepted Answer

It lowers the activation energy, increasing the reaction rate.

Question 10

Which of the following is the correct balanced equation for the complete combustion of propane ($$C_3H_8$$)?

Accepted Answer

$$C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O$$

Question 11

Which of the following is an example of an oxidation reaction in organic chemistry?

Accepted Answer

Conversion of a primary alcohol to an aldehyde

Question 12

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes are biological catalysts that speed up reactions without being consumed.

Question 13

Which of the following best describes a cis isomer in an alkene?

Accepted Answer

The two substituents are on the same side of the double bond.

Question 14

How many moles of $$CO_2$$ are produced from the complete combustion of 44 grams of propane ($$C_3H_8$$)? (Molar mass $$C_3H_8 = 44 g/$$mol)

Accepted Answer

3 moles

Question 15

Which of the following is a correct classification for the reaction: $$C_2H_4 + H_2$ \rightarrow C_2H_6$$?

Accepted Answer

Hydrogenation (addition) reaction

Question 16

Which of the following fatty acids is classified as an omega-3 fatty acid?

Accepted Answer

A fatty acid with the first double bond at the third carbon from the methyl end

Question 17

Which of the following is true about chiral centers in organic molecules?

Accepted Answer

A chiral center is a carbon atom bonded to four different groups.

Question 18

Which of the following is a correct example of a condensation reaction?

Accepted Answer

Formation of an ester from a carboxylic acid and an alcohol with the loss of water

Question 19

Which of the following statements about the effect of temperature on reaction rate is correct?

Accepted Answer

Increasing temperature increases the reaction rate by providing more particles with sufficient energy to overcome the activation energy.

Chemistry Basics, Organic Chemistry, and Chemical Reactions: Study Guide

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