Q: A graduated cylinder contains 25.0 mL of water. After a metal object is submerged, the water level rises to 32.5 mL. If the mass of the object is 60.0 g, what is its density?

$$\text{Density} = \frac{60.0\ \text{g}}{7.5\ \text{mL}} = 8.0\ \text{g/mL}$$

Q: A patient is prescribed a medication at a dosage of $$5.0\ \text{mg/kg}$$ body weight. If the patient weighs $$70.0\ \text{kg}$$, how many milligrams of medication should be administered?

$$5.0\ \text{mg} \times 70.0 = 350\ \text{mg}$$

Q: A sample of water is heated from $$20.0\ ^\circ\text{C} to$$ $$85.0\ ^\circ\text{C}. If $$the mass of the water is $$50.0\ \text{g}$$ and the specific heat is $$4.18\ \text{J/g}^\circ\text{C}$$, how much heat is absorbed?

$$\text{Heat} = 50.0 \times (85.0 - 20.0) \times 4.18 = 13,585\ \text{J}$$

Q: A solution contains 15.0 g NaCl dissolved in enough water to make 250.0 mL of solution. What is the percent (m/v) concentration of NaCl?

$$\frac{15.0\ \text{g}}{250.0\ \text{mL}} \times 100 = 6.0\%$$

Question 1

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

Accepted Answer

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

Question 2

A graduated cylinder contains 25.0 mL of water. After a metal object is submerged, the water level rises to 32.5 mL. If the mass of the object is 60.0 g, what is its density?

Accepted Answer

$$	ext{Density} = \frac{60.0\ 	ext{g}}{7.5\ 	ext{mL}} = 8.0\ 	ext{g/mL}$$

Question 3

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

Accepted Answer

Sand and iron filings

Question 4

A patient is prescribed a medication at a dosage of $$5.0\ 	ext{mg/kg}$$ body weight. If the patient weighs $$70.0\ 	ext{kg}$$, how many milligrams of medication should be administered?

Accepted Answer

$$5.0\ 	ext{mg} 	imes 70.0 = 350\ 	ext{mg}$$

Question 5

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 6

How many significant figures are in the measurement $$0.004560\ 	ext{g}$$?

Accepted Answer

4

Question 7

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

NaHCO$$_3$$

Question 8

Which of the following molecules can form hydrogen bonds?

Accepted Answer

NH$$_3$$

Question 9

What is the correct name for the compound CuSO$$_4$$?

Accepted Answer

Copper(II) sulfate

Question 10

Which of the following statements about the Kelvin temperature scale is correct?

Accepted Answer

There are no negative temperatures on the Kelvin scale.

Question 11

A sample of water is heated from $$20.0\ ^\circ	ext{C} to$$ $$85.0\ ^\circ	ext{C}. If $$the mass of the water is $$50.0\ 	ext{g}$$ and the specific heat is $$4.18\ 	ext{J/g}^\circ	ext{C}$$, how much heat is absorbed?

Accepted Answer

$$	ext{Heat} = 50.0 	imes (85.0 - 20.0) 	imes 4.18 = 13,585\ 	ext{J}$$

Question 12

Which of the following best explains why ice floats on water?

Accepted Answer

Ice is less dense than liquid water.

Question 13

Which of the following is the correct electron-dot (Lewis) structure for a chlorine atom?

Accepted Answer

A Cl symbol surrounded by 7 dots

Question 14

Which of the following molecules is nonpolar?

Accepted Answer

CO$$_2$$

Question 15

What is the dominant intermolecular force in CH$$_4 ($$methane)?

Accepted Answer

Dispersion (London) forces

Question 16

Which of the following is the correct formula for aluminum sulfate?

Accepted Answer

Al$$_2(SO$_4$$)$$_3$$

Question 17

How many valence electrons does a nitrogen atom have?

Accepted Answer

5

Question 18

Which of the following best describes the trend in atomic size across a period from left to right on the periodic table?

Accepted Answer

Atomic size decreases

Question 19

Which of the following is the correct name for the molecular compound N$$_2O$_4$$?

Accepted Answer

Dinitrogen tetroxide

Question 20

A solution contains 15.0 g NaCl dissolved in enough water to make 250.0 mL of solution. What is the percent (m/v) concentration of NaCl?

Accepted Answer

$$\frac{15.0\ 	ext{g}}{250.0\ 	ext{mL}} 	imes 100 = 6.0\%$$

Foundations of Chemistry: Matter, Measurement, and Chemical Compounds

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