Q: Which of the following is a correct use of dimensional analysis to convert 5.00 inches to centimeters? (1 inch = 2.54 cm)

$5.00\ \text{in} \times \frac{2.54\ \text{cm}}{1\ \text{in}} = 12.7\ \text{cm}$

Question 1

Which of the following statements best describes a heterogeneous mixture?

Accepted Answer

It consists of two or more substances that are not uniformly mixed and can be separated by physical means.

Question 2

Which of the following is the correct electron configuration for a neutral atom of sodium ($Z = 11$)?

Accepted Answer

$1s^2\ 2s^2\ 2p^6\ 3s^1$

Question 3

Dalton's Atomic Theory included several postulates. Which of the following is NOT a postulate of Dalton's Atomic Theory?

Accepted Answer

Atoms can be created or destroyed in chemical reactions.

Question 4

A sample contains 3.00 moles of $\ce{NaCl}$. How many formula units of $\ce{NaCl}$ are present in the sample? ($N_A = 6.022 	imes 10^{23}\ 	ext{mol}^{-1}$)

Accepted Answer

$1.81 	imes 10^{24}$

Question 5

Which of the following best explains why isotopes of the same element have different atomic masses?

Accepted Answer

They have different numbers of neutrons.

Question 6

Which of the following compounds is most likely to be soluble in water?

Accepted Answer

$\ce{NaNO_3}$

Question 7

Given the following unbalanced equation: $\ce{C_2H_6 + O_2 -> CO_2 + H_2O}$, what is the sum of the coefficients when the equation is balanced?

Accepted Answer

13

Question 8

Which of the following best describes a strong electrolyte?

Accepted Answer

A substance that dissolves in water and produces a solution that conducts electricity very well because it completely dissociates into ions.

Question 9

Which of the following is the correct formula for the compound formed between aluminum and sulfate ions?

Accepted Answer

$\ce{Al_2(SO_4)_3}$

Question 10

A solution is prepared by dissolving 10.0 g of $\ce{NaOH}$ in enough water to make 500.0 mL of solution. What is the molarity of the solution? ($M_{NaOH} = 40.0\ 	ext{g/mol}$)

Accepted Answer

0.50\ 	ext{M}

Question 11

Which of the following best describes Rutherford's gold foil experiment and its significance?

Accepted Answer

It demonstrated that atoms are mostly empty space with a small, dense, positively charged nucleus.

Question 12

Which of the following is the correct IUPAC name for $\ce{FeCl_3}$?

Accepted Answer

Iron(III) chloride

Question 13

A student mixes solutions of $\ce{AgNO_3}$ and $\ce{NaCl}$ and observes a white precipitate. Which compound is the precipitate?

Accepted Answer

$\ce{AgCl}$

Question 14

Which of the following is the correct net ionic equation for the reaction between $\ce{BaCl_2}$ and $\ce{Na_2SO_4}$ in aqueous solution?

Accepted Answer

$\ce{Ba^{2+}(aq) + SO_4^{2-}(aq) -> BaSO_4(s)}$

Question 15

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

Accepted Answer

Gain of electrons by a substance.

Question 16

A 25.0 mL sample of 0.200 M $\ce{HCl}$ is diluted to a final volume of 100.0 mL. What is the new concentration?

Accepted Answer

0.050\ 	ext{M}

Question 17

Which of the following is a correct use of dimensional analysis to convert 5.00 inches to centimeters? (1 inch = 2.54 cm)

Accepted Answer

$5.00\ 	ext{in} 	imes \frac{2.54\ 	ext{cm}}{1\ 	ext{in}} = 12.7\ 	ext{cm}$

Question 18

Which of the following is the correct empirical formula for a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$\ce{CH_2O}$

Question 19

Which of the following best describes the difference between a covalent and an ionic compound?

Accepted Answer

Covalent compounds are formed by the sharing of electrons between nonmetals, while ionic compounds are formed by the transfer of electrons from metals to nonmetals.

Question 20

A reaction has a theoretical yield of 15.0 g, but only 12.0 g of product is actually obtained. What is the percent yield?

Accepted Answer

$80.0\%$

General Chemistry I: Exam 1 Study Guide (Chapters 1–4)

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