Q: Which equation is used to calculate the density of a substance?

$$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$$

Q: Which equation is used to calculate molarity?

$$\text{Molarity} = \frac{\text{moles solute}}{\text{liters solution}}$$

Question 1

Which step in the scientific method involves forming a possible explanation based on prior knowledge and research?

Accepted Answer

Construct hypothesis

Question 2

A sample of water is measured using three different rulers. The measurements are 20 cm, 23 cm, and 22.2 cm. Which measurement has the greatest number of significant figures?

Accepted Answer

22.2 cm

Question 3

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements in fixed definite proportions

Question 4

Which equation is used to calculate the density of a substance?

Accepted Answer

$$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}}$$

Question 5

A cube of aluminum has a density of $$2.70\ 	ext{g/mL}$$ and measures $$1.21\ 	ext{cm} on $$each side. What is the mass of the cube?

Accepted Answer

$$4.78\ 	ext{g}$$

Question 6

Which of the following is a chemical change?

Accepted Answer

Burning wood

Question 7

What is the correct electron configuration for the Ca$$^{2+}$$ ion?

Accepted Answer

$$[Ar]$$

Question 8

Which metric prefix represents $$10^{-3}$$?

Accepted Answer

Milli

Question 9

A solution is made from $$12.6\ 	ext{g} of $$NaCl and $$100\ 	ext{g} of $$water. What is the mass percent of NaCl in the solution?

Accepted Answer

$$12.6\%$$

Question 10

Which equation is used to calculate molarity?

Accepted Answer

$$	ext{Molarity} = \frac{	ext{moles solute}}{	ext{liters solution}}$$

Question 11

Which of the following substances is soluble in water according to solubility rules and polarity?

Accepted Answer

CaCl$$_2$$

Question 12

What is the empirical formula for a compound formed from $$3.24\ 	ext{g} of $$titanium and $$2.16\ 	ext{g} of $$oxygen?

Accepted Answer

TiO$$_2$$

Question 13

Which equation represents the Ideal Gas Law?

Accepted Answer

$$PV = nRT$$

Question 14

If $$[H_3O^+] = 2.1 	imes 10$$^{-3}$$, what is the pH of the solution?

Accepted Answer

2.68

Question 15

Which of the following molecules is nonpolar due to its symmetry?

Accepted Answer

CH$$_4$$

Question 16

A gold crown has a mass of $$883.39\ 	ext{g}$$ and a density of $$19.3\ 	ext{g/mL}. $$What is its volume?

Accepted Answer

$$45.8\ 	ext{mL}$$

Question 17

Which of the following is a property of acids?

Accepted Answer

Turns blue litmus paper red

Question 18

What is the percent yield if the theoretical yield is $$36\ 	ext{g}$$ and the actual yield is $$30\ 	ext{g}$$?

Accepted Answer

$$83.3\%$$

Question 19

Which type of radioactive decay results in the emission of a $$^4_2	ext{He}$$ particle?

Accepted Answer

Alpha emission

Introductory Chemistry: Comprehensive Final Exam Review Notes

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