Q: Which of the following is the correct formula for calculating the number of neutrons in an atom?

$$\text{Number of neutrons} = \text{Mass number} - \text{Atomic number}$$

Q: Which of the following is a correct example of a redox reaction?

$$\text{Zn} + \text{Cu}^{2+} \rightarrow \text{Zn}^{2+} + \text{Cu}$$

Q: Which of the following is the correct formula for calculating the pH of a solution given the hydrogen ion concentration $$[H^+]$$?

$$\text{pH} = -\log_{10}[H^+]$$

Question 1

Which of the following best describes how a positive ion (cation) is formed?

Accepted Answer

By losing electrons to another atom.

Question 2

Which of the following is the correct formula for calculating the number of neutrons in an atom?

Accepted Answer

$$	ext{Number of neutrons} = 	ext{Mass number} - 	ext{Atomic number}$$

Question 3

A patient is given a solution containing sodium chloride (NaCl). What type of bond holds the sodium and chloride ions together in NaCl?

Accepted Answer

Ionic bond

Question 4

Which of the following is a correct example of a redox reaction?

Accepted Answer

$$	ext{Zn} + 	ext{Cu}^{2+} ightarrow 	ext{Zn}^{2+} + 	ext{Cu}$$

Question 5

Which of the following best describes the process of balancing a chemical equation?

Accepted Answer

Making sure the number of atoms of each element is the same on both sides of the equation.

Question 6

Which of the following is the correct formula for calculating the pH of a solution given the hydrogen ion concentration $$[H^+]$$?

Accepted Answer

$$	ext{pH} = -\log_{10}[H^+]$$

Question 7

A solution has a pH of 3. Which of the following best describes this solution?

Accepted Answer

It is acidic.

Question 8

Which of the following is true about isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 9

Which of the following is the correct definition of Standard Temperature and Pressure (STP)?

Accepted Answer

0°C and 1 atm

Question 10

A sample of gas at STP occupies 22.4 L. How many moles of gas are present?

Accepted Answer

1 mole

Question 11

Which of the following is the correct application of Charles's Law?

Accepted Answer

$$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}$$

Question 12

Which of the following is a molecular compound?

Accepted Answer

CO$$_2$$

Question 13

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^4$$

Question 14

Which of the following best describes an ionic compound?

Accepted Answer

A compound formed by the transfer of electrons from a metal to a nonmetal.

Question 15

Which of the following is the correct definition of atomic number?

Accepted Answer

The number of protons in an atom.

Question 16

A chemical reaction has the following equation: $$2H_2 + O_2$ \rightarrow 2H_2O. $$How many molecules of water are produced when 4 molecules of $$H_2$$ react with 2 molecules of $$O_2$$?

Accepted Answer

4 molecules

Question 17

Which of the following is the correct definition of electronegativity?

Accepted Answer

The ability of an atom to attract electrons in a chemical bond.

Question 18

Which of the following is the correct formula for calculating the equilibrium constant $$K_{eq}$$ for the reaction $$aA + bB \rightleftharpoons cC + dD$$?

Accepted Answer

$$K_{eq} = \frac{[C]^c [D]^d}{[A]^a [B]^b}$$

Question 19

Which of the following is the correct definition of a buffer solution?

Accepted Answer

A solution that resists changes in pH when small amounts of acid or base are added.

CHE 101-01 Final Exam Study Guide: Key Concepts in GOB Chemistry

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