Question 1

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the components are not evenly distributed and can be visually distinguished

Question 2

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

Accepted Answer

Melting of ice to form liquid water

Question 3

A student measures the mass of a sample three times and records the values: 5.12 g, 5.13 g, and 5.11 g. The true mass is 5.50 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate

Question 4

Which of the following is the correct electron configuration for a neutral atom of magnesium ($$Z = 12$$)?

Accepted Answer

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

Question 5

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons

Question 6

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$CH_2O$$

Question 7

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

They consist of ions held together by strong electrostatic forces

Question 8

Which of the following is the correct balanced equation for the reaction of aluminum with oxygen to form aluminum oxide?

Accepted Answer

$$4Al + 3O_2 \rightarrow 2Al_2O_3$$

Question 9

A solution is prepared by dissolving 5.00 g of NaCl in enough water to make 250.0 mL of solution. What is the molarity of the solution? ($$M_{NaCl} = 58.44\ g/mol)$$

Accepted Answer

$$0.342\ M$$

Question 10

Which of the following statements about the octet rule is correct?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their outermost shell

Question 11

Which of the following molecules is nonpolar?

Accepted Answer

$$CO_2$$

Question 12

Which of the following best describes the difference between a strong electrolyte and a weak electrolyte?

Accepted Answer

A strong electrolyte completely dissociates into ions in solution, while a weak electrolyte only partially dissociates

Question 13

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of silver nitrate and sodium chloride?

Accepted Answer

$$Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)$$

Question 14

Which of the following best describes the role of a catalyst in a chemical reaction?

Accepted Answer

It increases the rate of the reaction by lowering the activation energy

Question 15

Which of the following is the correct formula for calculating the percent yield of a reaction?

Accepted Answer

$$	ext{Percent Yield} = \frac{	ext{Actual Yield}}{	ext{Theoretical Yield}} 	imes 100\%$$

Question 16

Which of the following best describes the VSEPR theory?

Accepted Answer

It predicts the geometry of molecules based on the repulsion between electron pairs around a central atom

Question 17

Which of the following is a correct statement about the periodic trend for atomic radius?

Accepted Answer

Atomic radius increases from top to bottom within a group

Question 18

A sample of gas occupies 2.50 L at 1.00 atm and 300 K. What volume will it occupy at 2.00 atm and 300 K? (Assume ideal gas behavior.)

Accepted Answer

$$1.25\ L$$

Question 19

Which of the following best describes why water is a good solvent for ionic compounds?

Accepted Answer

Water is a polar molecule and can stabilize ions through ion-dipole interactions

CHEM 1025 Final Exam Review Topics (Ch 2-10 & 13): Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards