Question 1

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound has a fixed composition with elements combined in definite proportions, while a mixture consists of substances physically combined in variable proportions.

Question 2

A student measures the mass of a rectangular block as $$16.39\ \mathrm{g}$$ and its volume as $$2.5\ \mathrm{cm}^3. $$What is the density of the block, reported to the correct number of significant figures?

Accepted Answer

$$6.6\ \mathrm{g/cm}^3$$

Question 3

Which of the following is the correct formula for ammonium sulfite?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_3}$$

Question 4

Which of the following best describes the process of oxidation in a redox reaction?

Accepted Answer

A substance loses electrons and its oxidation number increases.

Question 5

Which of the following is the correct balanced equation for the combustion of methane ($$\mathrm{CH_4$}) in $$oxygen?

Accepted Answer

$$\mathrm{CH_4$} + 2\mathrm{O_2$} \rightarrow \mathrm{CO_2$} + 2\mathrm{H_2O}$$

Question 6

A solution is prepared by dissolving $$18.0\ \mathrm{g} of $$glucose ($$\mathrm{C_6H_{12}O_6$}$$, molar mass $$180.1\ \mathrm{g/mol}) in $$enough water to make $$0.250\ \mathrm{L} of $$solution. What is the molarity of the solution?

Accepted Answer

$$0.36\ \mathrm{M}$$

Question 7

Which of the following statements about the kinetic molecular theory of gases is FALSE?

Accepted Answer

Gas particles exert attractive and repulsive forces on each other.

Question 8

Which of the following ions has the correct formula and charge?

Accepted Answer

$$\mathrm{SO_3$}^{2-} ($$sulfite)

Question 9

Which of the following best explains why water is a polar molecule?

Accepted Answer

Water has a bent molecular geometry and an uneven distribution of electron density.

Question 10

A sample of gas occupies $$4.00\ \mathrm{L} at$$ $$1.00\ \mathrm{atm}$$ and $$300\ \mathrm{K}. $$What volume will it occupy at $$2.00\ \mathrm{atm}$$ and $$300\ \mathrm{K}$$, assuming ideal behavior?

Accepted Answer

$$2.00\ \mathrm{L}$$

Question 11

Which of the following is the correct Lewis structure for carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 12

Which of the following best describes the effect of increasing atomic number across a period on atomic radius?

Accepted Answer

Atomic radius decreases due to increased nuclear charge pulling electrons closer.

Question 13

Which of the following is a correct resonance structure for the carbonate ion ($$\mathrm{CO_3$}^{2-}$$)?

Accepted Answer

One oxygen atom has a double bond to carbon, the other two have single bonds, and the negative charges are delocalized over the two singly bonded oxygens.

Question 14

Which of the following statements about exothermic and endothermic reactions is correct?

Accepted Answer

Exothermic reactions release heat to the surroundings.

Question 15

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of sodium chloride and silver nitrate?

Accepted Answer

$$\mathrm{Ag^+} (aq) + \mathrm{Cl^-} (aq) \rightarrow \mathrm{AgCl} (s)$$

Question 16

Which of the following best explains why the laboratory experiment did not require the addition of an indicator?

Accepted Answer

The reaction involved a color change that was visible without an indicator.

Question 17

Which of the following is the correct formula for copper(II) nitrate?

Accepted Answer

$$\mathrm{Cu(NO_3$)_2}$$

Question 18

A $$2.00\ \mathrm{L}$$ sample of gas at $$25^\circ\mathrm{C}$$ and $$1.00\ \mathrm{atm} is $$compressed to $$1.00\ \mathrm{L} at $$constant temperature. What is the final pressure?

Accepted Answer

$$2.00\ \mathrm{atm}$$

Question 19

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

Accepted Answer

It decreases the activation energy, increasing the reaction rate.

General Chemistry I: Comprehensive Study Notes and Learning Outcomes

Guida di studio - Domande di pratica

Study guide - Flashcard