Q: Which of the following is the correct formula for calculating the energy change ($$\Delta E) in an $$endothermic reaction?

$$\Delta E = \text{Energy entering the reaction}$$

Question 1

Which of the following statements correctly describes a valence electron in a sodium atom (Na)?

Accepted Answer

It is an electron in the outermost shell that is available for bonding.

Question 2

Which electron configuration represents a neutral oxygen atom?

Accepted Answer

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

Question 3

Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

Accepted Answer

Pauli Exclusion Principle

Question 4

A student mixes 50.0 mL of 1.00 M HCl with 50.0 mL of 1.00 M NaOH. What is the final concentration of NaCl in the solution after the reaction is complete?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 5

Which of the following best describes the difference between a strong acid and a weak acid in aqueous solution?

Accepted Answer

A strong acid completely ionizes in water, while a weak acid only partially ionizes.

Question 6

Which of the following ions is a spectator ion in the reaction between aqueous NaCl and AgNO$$_3$$?

Accepted Answer

Na$$^+$$

Question 7

Which of the following statements about electromagnetic waves is correct?

Accepted Answer

High frequency waves have short wavelengths.

Question 8

Which of the following is the correct formula for calculating the energy change ($$\Delta E) in an $$endothermic reaction?

Accepted Answer

$$\Delta E = 	ext{Energy entering the reaction}$$

Question 9

Which of the following elements has the highest ionization energy?

Accepted Answer

F

Question 10

What is the oxidation state of oxygen in H$$_2O$_2$$?

Accepted Answer

$$-1$$

Question 11

Which of the following best describes the role of a reducing agent in a redox reaction?

Accepted Answer

It loses electrons and is oxidized.

Question 12

A solution is prepared by dissolving 0.50 mol of NaCl in enough water to make 1.0 L of solution. What is the molarity of the solution?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 13

Which of the following is the correct balanced molecular equation for the reaction between aqueous HCl and NaOH?

Accepted Answer

$$\mathrm{HCl}(aq) + \mathrm{NaOH}(aq) \rightarrow \mathrm{NaCl}(aq) + \mathrm{H_2O}(l)$$

Question 14

Which of the following best explains why the atomic radius decreases across a period from left to right?

Accepted Answer

The nuclear charge increases, pulling electrons closer.

Question 15

Which of the following is the correct net ionic equation for the reaction between AgNO$$_3(aq) $$and NaCl(aq)?

Accepted Answer

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

Question 16

Which of the following is the correct formula for calculating the frequency ($$f) of a $$wave given its wavelength ($$\lambda) $$and the speed of light ($$c$$)?

Accepted Answer

$$f = \dfrac{c}{\lambda}$$

Question 17

Which of the following best describes the result of the double-slit experiment?

Accepted Answer

It shows that light and electrons exhibit both wave and particle properties.

Question 18

Which of the following is the correct formula for calculating molar mass ($$M) $$from mass ($$m) $$and number of moles ($$n$$)?

Accepted Answer

$$M = \dfrac{m}{n}$$

Question 19

Which of the following statements about heat capacity is correct?

Accepted Answer

Heat capacity is the amount of heat required to raise the temperature of a substance by one degree Celsius.

General Chemistry 1A Exam 2 Study Guide: Atomic Structure, Periodicity, Chemical Reactions, and Solution Chemistry

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