Q: Which of the following is a correct example of dimensional analysis to convert $5.0\ \mathrm{km}$ to $\mathrm{m}$?

$5.0\ \mathrm{km} \times \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} = 5000\ \mathrm{m}$

Question 1

A student measures the mass of a metal block as $45.67\ \mathrm{g}$ and its volume as $16.2\ \mathrm{cm}^3$. What is the density of the metal, reported to the correct number of significant figures?

Accepted Answer

$2.82\ \mathrm{g/cm}^3$

Question 2

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 3

A solution is prepared by dissolving $5.00\ \mathrm{g}$ of NaCl in $100.0\ \mathrm{g}$ of water. Which of the following best describes the resulting mixture?

Accepted Answer

Homogeneous mixture

Question 4

Which of the following changes is a chemical change?

Accepted Answer

Rusting of iron

Question 5

A graduated cylinder is used to measure the volume of a liquid. The liquid level is between the $21.0\ \mathrm{mL}$ and $22.0\ \mathrm{mL}$ marks, closer to $21.6\ \mathrm{mL}$. What is the correct way to record this measurement?

Accepted Answer

$21.60\ \mathrm{mL}$

Question 6

Which of the following best describes the difference between physical and chemical properties?

Accepted Answer

Physical properties can be observed without changing the substance's identity, while chemical properties describe how a substance reacts to form new substances.

Question 7

Which of the following is the correct name for the compound $\mathrm{FeCl}_3$?

Accepted Answer

Iron(III) chloride

Question 8

A student needs to convert $25.0\ \mathrm{cm}^3$ to $\mathrm{mL}$. Which of the following is the correct answer and conversion factor?

Accepted Answer

$25.0\ \mathrm{mL}$;\ 1\ \mathrm{cm}^3 = 1\ \mathrm{mL}$

Question 9

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the composition is not uniform throughout

Question 10

Which of the following glassware is most appropriate for measuring $25.00\ \mathrm{mL}$ of a solution with the highest precision?

Accepted Answer

Volumetric pipette

Question 11

A sample of gold has a mass of $19.3\ \mathrm{g}$ and a volume of $1.00\ \mathrm{cm}^3$. If the accepted density of gold is $19.3\ \mathrm{g/cm}^3$, what is the percent error in the student's measurement?

Accepted Answer

$0\%$

Question 12

Which of the following is a physical separation technique that can be used to separate a mixture of sand and salt?

Accepted Answer

Filtration

Question 13

Which of the following is an example of a chemical property?

Accepted Answer

Ability to react with oxygen

Question 14

Which of the following is a correct classification for oxygen ($\mathrm{O}_2$) at room temperature?

Accepted Answer

Element and gas

Question 15

A student records the following measurements for the mass of a sample: $2.51\ \mathrm{g}$, $2.50\ \mathrm{g}$, $2.52\ \mathrm{g}$, and $2.51\ \mathrm{g}$. The true mass is $2.70\ \mathrm{g}$. Which statement best describes the data?

Accepted Answer

The data are precise but not accurate.

Question 16

Which of the following is a correct example of dimensional analysis to convert $5.0\ \mathrm{km}$ to $\mathrm{m}$?

Accepted Answer

$5.0\ \mathrm{km} 	imes \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} = 5000\ \mathrm{m}$

Question 17

Which of the following best describes the difference between a metal and a nonmetal?

Accepted Answer

Metals are good conductors of electricity, while nonmetals are poor conductors.

Question 18

Which of the following is the correct name for $\mathrm{Na}_2\mathrm{SO}_4$?

Accepted Answer

Sodium sulfate

Question 19

Which of the following best describes the phase of matter for bromine ($\mathrm{Br}_2$) at room temperature?

Accepted Answer

Liquid

Question 20

A sample of water is heated from $25.0^\circ\mathrm{C}$ to $100.0^\circ\mathrm{C}$. Which property of water changes during this process?

Accepted Answer

Temperature

General Chemistry I: Unit 1 Study Guide

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