Question 1

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two nonmetal atoms.

Question 2

Given the molecular formula $$\mathrm{C_2H_6O}$$, which of the following is a valid Lewis structure for ethanol, ensuring all atoms have a complete octet or duet?

Accepted Answer

A structure where both carbons are bonded to each other, each carbon is bonded to three hydrogens, and the oxygen is bonded to one carbon and one hydrogen.

Question 3

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

$$\mathrm{AgCl}$$

Question 4

How many total valence electrons are present in a molecule of $$\mathrm{CO_2$}$$?

Accepted Answer

$$18$$

Question 5

Which of the following best describes the effect of lone pairs on the bond angles in a molecule with tetrahedral electron geometry?

Accepted Answer

Lone pairs decrease the bond angles between atoms.

Question 6

A sample contains $$0.50$$ moles of $$\mathrm{NaCl}. $$How many formula units of $$\mathrm{NaCl}$$ are present in the sample? (Avogadro's number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$3.01 	imes 10$$^{23}$$

Question 7

Which of the following molecules is nonpolar, given its geometry and bond polarities?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 8

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

Accepted Answer

Butane

Question 9

Which functional group is present in the molecule $$\mathrm{CH_3COOH}$$?

Accepted Answer

Carboxylic acid

Question 10

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

Accepted Answer

2-methylpropane

Question 11

A reaction has $$\Delta H = -150\ \mathrm{kJ}. $$Which statement is correct?

Accepted Answer

The reaction is exothermic and releases heat to the surroundings.

Question 12

Which of the following changes will increase the rate of a chemical reaction?

Accepted Answer

Increasing the concentration of reactants.

Question 13

Which of the following is the correct classification for the reaction: $$\mathrm{2H_2 + O_2$ \rightarrow 2H_2O}$$?

Accepted Answer

Synthesis reaction

Question 14

In the reaction $$\mathrm{Zn + $$CuSO_4$$ \rightarrow $$ZnSO_4$$ + Cu}$$, which element is oxidized?

Accepted Answer

Zn

Question 15

Which of the following best describes an alkene functional group?

Accepted Answer

A hydrocarbon with at least one carbon-carbon double bond.

Question 16

Which of the following molecules contains a chiral carbon?

Accepted Answer

$$\mathrm{CH_3CHBrCH_3}$$

Question 17

What is the molar mass of $$\mathrm{C_2H_6O} ($$ethanol)? (C: 12.01 g/mol, H: 1.01 g/mol, O: 16.00 g/mol)

Accepted Answer

$$46.08\ \mathrm{g/mol}$$

Question 18

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases from left to right across a period.

Question 19

Which of the following is the correct formula for dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N_2O_4}$$

Question 20

Which of the following best describes an exergonic reaction?

Accepted Answer

$$\Delta G \u003c 0$$, the reaction is spontaneous.

CHEM1050 Exam #2 Study Guide: Compounds, Organic Chemistry, and Chemical Reactions

Guida di studio - Domande di pratica

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