Q: A sample of ethanol has a density of $0.789\ \mathrm{g/mL}$. What is the mass of $50.0\ \mathrm{mL}$ of ethanol?

$0.789 \times 50.0 = 39.45\ \mathrm{g}$

Q: A patient’s body temperature is measured as $102.2\ ^\circ\mathrm{F}$. What is this temperature in Celsius?

$(102.2 - 32) \times \frac{5}{9} = 39.0\ ^\circ\mathrm{C}$

Question 1

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

Accepted Answer

Iron rusting when exposed to air

Question 2

A student measures the mass of a metal block as 45.0 g and its volume as 15.0 mL. What is the density of the metal?

Accepted Answer

$\frac{45.0\ \mathrm{g}}{15.0\ \mathrm{mL}} = 3.0\ \mathrm{g/mL}$

Question 3

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout

Question 4

Convert a temperature of $25.0\ ^\circ\mathrm{C}$ to Kelvin.

Accepted Answer

$25.0 + 273.15 = 298.15\ \mathrm{K}$

Question 5

Which of the following is NOT a physical property?

Accepted Answer

Flammability

Question 6

A sample of ethanol has a density of $0.789\ \mathrm{g/mL}$. What is the mass of $50.0\ \mathrm{mL}$ of ethanol?

Accepted Answer

$0.789 	imes 50.0 = 39.45\ \mathrm{g}$

Question 7

Which of the following statements about matter is correct?

Accepted Answer

An element is a pure substance that cannot be broken down by chemical means

Question 8

A patient’s body temperature is measured as $102.2\ ^\circ\mathrm{F}$. What is this temperature in Celsius?

Accepted Answer

$(102.2 - 32) 	imes \frac{5}{9} = 39.0\ ^\circ\mathrm{C}$

Question 9

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen

Question 10

A gold ring has a mass of $6.50\ \mathrm{g}$ and a volume of $0.340\ \mathrm{cm}^3$. What is the density of gold in $\mathrm{g/cm}^3$?

Accepted Answer

$\frac{6.50}{0.340} = 19.1\ \mathrm{g/cm}^3$

Question 11

Which of the following best describes a physical change?

Accepted Answer

Evaporating alcohol from skin

Question 12

A solution is prepared by dissolving $10.0\ \mathrm{g}$ of salt in $90.0\ \mathrm{g}$ of water. Which statement is correct?

Accepted Answer

The solution is a homogeneous mixture

Question 13

Which of the following is a pure substance?

Accepted Answer

Carbon dioxide

Question 14

A sample of mercury has a density of $13.6\ \mathrm{g/mL}$. What is the volume of $27.2\ \mathrm{g}$ of mercury?

Accepted Answer

$\frac{27.2}{13.6} = 2.00\ \mathrm{mL}$

Question 15

Which of the following is NOT a mixture?

Accepted Answer

Salt (NaCl)

Question 16

A chemist needs to convert $250.0\ \mathrm{mL}$ to liters using dimensional analysis. Which setup is correct?

Accepted Answer

$250.0\ \mathrm{mL} 	imes \frac{1\ \mathrm{L}}{1000\ \mathrm{mL}} = 0.250\ \mathrm{L}$

Question 17

Which of the following best describes the phase change that occurs when dry ice (solid CO$_2$) is left at room temperature?

Accepted Answer

Sublimation

Question 18

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 19

A student needs to convert $5.00\ \mathrm{cm}$ to inches using the conversion factor $1\ \mathrm{in} = 2.54\ \mathrm{cm}$. What is the correct answer?

Accepted Answer

$5.00\ \mathrm{cm} 	imes \frac{1\ \mathrm{in}}{2.54\ \mathrm{cm}} = 1.97\ \mathrm{in}$

Question 20

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

Accepted Answer

A physical property can be observed without changing the substance’s identity, while a chemical property describes the substance’s ability to undergo a specific chemical change.

Matter and Measurements: Phases, Classification, Properties, and Calculations

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