Question 1

Which of the following correctly names the compound with the formula $$\mathrm{Na_2SO_4}$$?

Accepted Answer

Sodium sulfate

Question 2

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

Carbon dioxide, $$\mathrm{CO_2$}$$

Question 3

What is the correct IUPAC name for the following compound: $$\mathrm{CH_3CH_2CH_2CH_3}$$?

Accepted Answer

Butane

Question 4

Which of the following statements about resonance is TRUE?

Accepted Answer

Resonance involves the delocalization of electrons, which increases molecular stability.

Question 5

A molecule has a central atom with four regions of electron density and no lone pairs. What is its molecular geometry and approximate bond angle?

Accepted Answer

Tetrahedral, $$109.5^\circ$$

Question 6

Which of the following is the correct condensed structural formula for an ester?

Accepted Answer

$$\mathrm{RCOOR'}$$

Question 7

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in a molecule of ethyne ($$\mathrm{C_2H_2}$$)?

Accepted Answer

3 $$\sigma$$ bonds and 2 $$\pi$$ bonds

Question 8

Which of the following best describes a molecule that is optically active?

Accepted Answer

It contains at least one chiral center and has non-superimposable mirror images.

Question 9

What is the correct name for the polyatomic ion $$\mathrm{NO_3$^-}$$?

Accepted Answer

Nitrate

Question 10

Which of the following compounds is a structural (constitutional) isomer of $$\mathrm{C_4H_{10}}$$?

Accepted Answer

2-methylpropane

Question 11

A patient is given a medication containing the ion $$\mathrm{NH_4$^+}. $$What is the name of this ion?

Accepted Answer

Ammonium

Question 12

Which of the following best explains why double bonds are more reactive than single bonds?

Accepted Answer

Double bonds contain a $$\pi$$ bond, which is weaker and more easily broken than a $$\sigma$$ bond.

Question 13

Which of the following is the correct formula for the compound formed between calcium and phosphate?

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 14

Which of the following statements about fatty acids is TRUE?

Accepted Answer

Saturated fatty acids have higher melting points than unsaturated fatty acids due to stronger intermolecular forces.

Question 15

What is the index of hydrogen deficiency (IHD) for a molecule with the formula $$\mathrm{C_6H_{10}}$$?

Accepted Answer

2

Question 16

Which of the following is a correct statement about cis/trans isomerism in alkenes?

Accepted Answer

Cis/trans isomerism is possible only if each carbon of the double bond has two different groups attached.

Question 17

Which of the following best describes the geometry and bond angle of ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Trigonal pyramidal, $$107^\circ$$

Question 18

Which of the following is the correct name for the compound $$\mathrm{CH_3CH_2OH}$$?

Accepted Answer

Ethanol

Question 19

A molecule has the formula $$\mathrm{C_5H_{12}}. $$Which class of hydrocarbon does it belong to?

Accepted Answer

Alkane

Question 20

Which of the following is a correct statement about isomers?

Accepted Answer

Enantiomers are non-superimposable mirror images of each other.

CHEM 1110 Exam 2 Study Guide: Compounds, Bonding, and Organic Molecules

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