Q: Which of the following is the correct formula for calculating molarity?

$$\text{Molarity} = \dfrac{\text{moles of solute}}{\text{liters of solution}}$$

Question 1

Which subatomic particle is responsible for the positive charge of an atom?

Accepted Answer

Proton

Question 2

What is the correct electron configuration for an oxygen atom?

Accepted Answer

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

Question 3

Which of the following best describes how electronegativity changes across a period in the periodic table?

Accepted Answer

It increases from left to right.

Question 4

A solution is prepared by dissolving 0.5 moles of NaCl in enough water to make 2 liters of solution. What is the molarity of the solution?

Accepted Answer

$$0.25\ \mathrm{M}$$

Question 5

Which statement is true about balancing chemical equations?

Accepted Answer

The number of atoms of each element must be equal on both sides of the equation.

Question 6

Which of the following is the correct formula for calculating molarity?

Accepted Answer

$$	ext{Molarity} = \dfrac{	ext{moles of solute}}{	ext{liters of solution}}$$

Question 7

If an atom has 8 protons, 8 neutrons, and 8 electrons, what is its atomic number?

Accepted Answer

8

Question 8

Which of the following elements is expected to have the highest electronegativity?

Accepted Answer

Fluorine

Question 9

A student mixes 0.2 moles of glucose into 500 mL of water. What is the molarity of the resulting solution?

Accepted Answer

$$0.4\ \mathrm{M}$$

Question 10

Which of the following is NOT a subatomic particle found in atoms?

Accepted Answer

Photon

Question 11

When balancing the chemical equation $$\mathrm{H_2$ + O_2$ \rightarrow H_2O}$$, what is the correct set of coefficients?

Accepted Answer

$$2\ \mathrm{H_2$} + 1\ \mathrm{O_2$} \rightarrow 2\ \mathrm{H_2O}$$

Question 12

Which of the following best explains why electronegativity increases across a period?

Accepted Answer

Increasing nuclear charge attracts electrons more strongly.

Question 13

A hospital prepares a saline solution by dissolving 9 grams of NaCl (molar mass = 58.5 g/mol) in enough water to make 0.5 liters of solution. What is the molarity of the solution?

Accepted Answer

$$0.31\ \mathrm{M}$$

Question 14

Which of the following statements about neutrons is correct?

Accepted Answer

Neutrons have no electrical charge.

Question 15

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

Accepted Answer

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

Question 16

Which of the following best describes the trend in atomic radius across a period in the periodic table?

Accepted Answer

Atomic radius decreases from left to right.

Question 17

A chemist needs to prepare 1.5 liters of a 0.2 M KCl solution. How many moles of KCl are required?

Accepted Answer

$$0.3\ 	ext{moles}$$

Question 18

Which of the following is a correct statement about electrons in an atom?

Accepted Answer

Electrons are negatively charged and found outside the nucleus.

Question 19

A student is asked to balance the equation $$\mathrm{C_2H_6 + O_2$ \rightarrow CO_2$ + H_2O}. $$What is the correct set of coefficients?

Accepted Answer

$$2\ \mathrm{C_2H_6} + 7\ \mathrm{O_2$} \rightarrow 4\ \mathrm{CO_2$} + 6\ \mathrm{H_2O}$$

Question 20

Which of the following best explains why atomic radius decreases across a period?

Accepted Answer

Increasing nuclear charge pulls electrons closer to the nucleus.

General Chemistry Study Notes: Atomic Structure, Molarity, Periodic Trends, Electron Configuration, and Chemical Equations

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