HESI A2 Chemistry Questions with Answers and Explanations (A Graded) Latest Questions and Complete Solutions Guaranteed A+: Latest 2023:2024 14 pages

HESI A2 Chemistry Questions with Answers and Explanations (A Graded) Latest Questions and Complete Solutions Guaranteed A+: Latest 2023:2024 

HESI A2 Chemistry Questions with Answers and

Explanations (A Graded) Latest Questions and

Complete Solutions

1. Which of the following elements is not involved in many hydrogen bonds?

A. fluorine

B. carbon

C. oxygen

D. nitrogen

Explanation: Carbon is not involved in many hydrogen bonds. A hydrogen bond occurs when an

atom of hydrogen that has a covalent bond with an electronegative atom forms a bond with a

third atom. The original covalent bond involving hydrogen gives away protons, and the third

element receives them. One of the reasons that fluorine, oxygen, and nitrogen are frequently part

of a hydrogen bond is that they have a strong electronegativity and are therefore able to form

more durable bonds. Chlorine is another element frequently involved in hydrogen bonds.

2. What is the mass (in grams) of 0.350 mol copper?

A. 12.5 g

B. 14.6 g

C. 18.5 g

D. 22.2 g

Explanation: The mass of 0.350 mol copper is 22.2 grams. This problem requires the use of the

periodic table. There you will see that the molecular mass of copper is approximately 63.5. Take

this figure and multiply it by the amount of copper given by the question: 0.350 mol. The

resulting figure is 22.225, which, rounded to the nearest tenth, is 22.2 grams. In order to succeed

on the HESI exam, you will need to be able to perform these simple calculations of mass.

3. How many d orbitals are there in a d subshell?

A. 5

B. 7

C. 9

D. 11

Explanation: There are five d orbitals in a d subshell (or sublevel). Each of these orbitals can

hold two electrons, so sublevel d is capable of holding 10 electrons. The s subshell has one

orbital, the p subshell has three orbitals, the d subshell has five orbitals, and the f subshell has

seven orbitals. In chemistry, the electron configuration of an atom is expressed in the following

form, using helium as an example: 1s2. In this notation, the 1 indicates that the electrons are

found in the first energy level of the atom, the s indicates that the electrons are in a spherical

orbit, and the superscript 2 indicates that there are 2 total electrons in the first energy level

subshell.

4. What is the name for the number of protons in an atom?

a. atomic identity

b. atomic mass

c. atomic weight

d. atomic number

Explanation: The number of protons in an atom is the atomic number. Protons are the

fundamental positive unit of an atom. They are located in the nucleus. In a neutral atom (an atom

with neither positive nor negative charge), the number of protons in the nucleus is equal to the

number of electrons orbiting the nucleus. When it needs to be expressed, atomic number is

written as a subscript in front of the element’s symbol, for example in 13Al. Atomic mass,

meanwhile, is the average mass of the various isotopes of a given element. Atomic identity and

atomic weight are not concepts in chemistry.

5. Which of the following elements is an alkali metal?

a. magnesium

b. rubidium

c. hydrogen

d. chlorine

Explanation: Rubidium is an alkali metal. The alkali metals are located in group 1 of the periodic

table. These soft substances melt at a low temperature and are typically white in color. The alkali

metals are lithium, sodium, potassium, rubidium, cesium, and francium. Rubidium, cesium, and

francium are not commonly encountered in the natural world. The alkali metals are highly reactive,

meaning that they easily engage in chemical reactions when combined with otherelements. These

metals have a low density and tend to react violently with wate

6. Which of the following substances allows for the fastest diffusion?

a) gas

b) solid

c) liquid

d) plasma

Explanation: Diffusion is fastest through gases. The next fastest medium for diffusion is liquid,

followed by plasma, and then solids. In chemistry, diffusion is defined as the movement of

matter by the random motions of molecules. In a gas or a liquid, the molecules are in perpetual

motion. For instance, in a quantity of seemingly immobile air, molecules of nitrogen and oxygen

are constantly bouncing off each other. There is even some miniscule degree of diffusion in

solids, which rises in proportion to the temperature of the substance.

7. What is the oxidation number of hydrogen in CaH2?

A. +1

B. 1

C. 0

D. +2

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