HESI A2 Chemistry Practice Test

The HESI A2 Chemistry Test consists of 25 questions related to Scientific Notation, the Metric System, and Temperature; the Atom; the Periodic Table; Chemical Equations; Solutions; Chemical Reactions; Oxidation-Reduction Reactions; Acids and Bases; Nuclear Chemistry; and Biochemistry.

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Scientific Notation, the Metric System, and Temperature

This subsection will require that you demonstrate your knowledge of scientific notation, metric prefixes and basic units of measurement, SI units of measurement, and temperature. Below are a couple sample questions:

1. Use scientific notation to shorten 0.00002509
2. Metric units of measurement include:
1. Meters, liters, and grams
2. Feet, ounces, and pounds
3. Meters, ounces, and grams

The first answer is: 2.509 x 10-5. You can arrive at this answer by simplifying and using exponents. The second answer is: a. Meters, liters, and grams.

The Atom

This subsection consists of questions related to the structure of the atom, including nuclei, electrons, protons, atomic radius, ions, electron clouds, and other related terms and concepts. For example:

1. The number of protons in the nucleus of an atom determines:
1. The number of negatively charged electrons that orbit the nucleus of an ion
2. The atomic number of an element
3. It determines the mass number of the atom

The correct answer is: b. The atomic number of an element.

The Periodic Table

This subsection consists of questions related to element grouping on the periodic table, as well as atomic weight, atomic radii, electronegativity, electron affinity, and other related terms and concepts. For example:

1. Standard atomic weight differs from atomic mass and refers to:
1. The ratio of an element’s average mass of atoms to 1/12 of the mass of a carbon-12 atom
2. The ratio of a carbon-12 atom to an atom’s relative mass based on its most stable isotope
3. The average mass of atoms in an element less the mass of a carbon-12 atom

The correct answer is: a. The ratio of an element’s average mass of atoms to 1/12 of the mass of a carbon-12 atom.

Chemical Equations

This subsection consists of questions related to chemical equations, including reactants, products, coefficients, as well as balanced and unbalanced equations, along with other related terms and concepts. For example:

1. An unbalanced equation
1. Follows the law of conservation of mass, thereby the coefficients on each side will be equal
2. Does not follow the law of conservation of mass, which means the coefficients on each side will not be equal
2. Means the coefficients are whole numbers and must be made fractional

The correct answer is: b. Does not follow the law of conservation of mass, which means the coefficients on each side will not be equal. The equation needs to be balanced by multiplying the coefficients by a constant so as to produce a small whole number.

Solutions

This subsection contains questions related to percent concentrations, molarity, Avogadro’s number, common solutions and their properties, polar and nonpolar solvents, solutes, the effects of pressure and temperature on solubility, along with other related terms and concepts. For example:

1. Hydrophilic molecules…
1. Repel water and do not readily combine with it
2. Attract water and readily combine with it
3. Are nonpolar and usually part of the noble gasses

The correct answer is: b. Attract water and readily combine with it. The suffix philic gives you a hint that these molecules “like” water. The opposite is hydrophobic; phobic indicating that the molecules are not attracted to water.

Chemical Reactions

The questions in this subsection cover the rates and catalysts of chemical reactions, as well as the effects of temperature on reaction rate, combination and decomposition reactions, single versus double substitution reactions, and covalent and ionic bonding, among other related terms and concepts. For example:

1. The Maxwell-Boltzmann distribution refers to:
1. The combination reaction of two or more reactants to form a single product
2. The rate of decomposition
3. The fuels and oxidants necessary for the process of combustion
4. A plot or graph illustrating the energy and/or speed of gas molecules or particles in a system

The correct answer to the first question is: d. A plot of graph illustrating the energy and/or speed of gas molecules or particles in a system.

Oxidation-Reduction Reactions

This subsection contains questions related to metathesis reactions, reducing and oxidizing agents, single replacement reactions, as well as oxidation state and number, among other related concepts and terms. For example:

1. Single replacement reactions are:
1. Oxidation/reduction reactions in which electrons are transferred from one species of chemical to another
2. Oxidation/reduction reactions in which oxidation state is increased through loss of electrons
3. Oxidation/reduction reactions in which electrons are split between bonds

The correct answer is: a. Oxidation/reduction reactions in which electrons are transferred from one species of chemical to another.

Acids and Bases

This subsection contains questions related to strong and weak acids and bases, superacids, superbases, and potential of hydrogen (pH), among other related concepts and terms. For example:

1. Superacids are:
1. Stronger than hydrogen in pH balance
2. Stronger than 100% sulfuric acid
3. Stronger than magic and perchloric acids
4. Stronger than hydrochloric and hydrobromic acids

The correct answer is: b. Stronger than 100% sulfuric acid. These acids include perchloric, magic, and fluoroantimonic acids.

Nuclear Chemistry

This subsection contains questions related to nuclear force, radioactive half-life, isotopes, radioisotopes, radioactivity, and radioactive decay, as well as alpha, beta, and gamma rays, among other related concepts and terms. For example:

1. ____ is a process that can cause the detachment of an electron from an atom
3. Beta rays
4. Gamma rays

The correct answer is: a. Ionizing radiation.

Biochemistry

This subsection consists of questions related to carbohydrates, including glycolysis, proton motive force, the Embden-Meyerhof pathway, proteins, condensation reaction, peptides, amino acids, lipids, and nucleic acids, among other related concepts and terms. For example:

1. Amino acids include:
1. Glutamine and asparagine
2. Fatty acids and phospholipids
3. Arginine, lysine, and histidine

The correct answer is: c. Arginine, lysine, and histidine.

Test Preparation

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by Mometrix Test Preparation | Last Updated: October 18, 2019