2021 HESI A2 CHEMISTRY EXAM QUESTIONS

PDF Download

2021 HESI A2 CHEMISTRY EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -91 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Which of the following is the deposition of a liquid or a solid from its vapor?

Answer:

• Evaporation

• Oxidation

C. CONDENSATION

• Vaporization

Question 2: Triglyceride

Answer:

is a neutral fat that contains three fatty acids that are joined to a glycerol.

Question 3: A base substance will usually contain which group?

Answer:

OH

Question 4: Who makes the polysaccharide known as glycogen?

Answer:

animals; glycogen serves as a form of energy for animals and fungi because it is a multi branched polysaccharide of glucose.

Question 5: When is a single covalent bond formed?

Answer:

When one pair of electrons is shared between two atoms.

Question 6: If a solution does from a pH of 3 to 2, it has become

Answer:

10 times more acidic; when a number on the pH scale does downward, it moves closer to the acidic side and is therefore becoming more acidic. The pH is a logarithmic scale, thus a step representing 1 represents 10 to the power of 1, or 10 times the original value.

Question 7: What is an atom called if it is electrically charged?

Answer:

An ion

Question 8: Oxidation

Answer:

is the combination of a substance with oxygen.

Question 9: Synthesis

Answer:

is when two elements are combined to form a product. The reverse, breaking down of a compound into its component parts is called decomposition. Synthesis is the creation of an object using artificial means.

Question 10: Double covalent bond

Answer:

is a chemical bond that shares two electron pairs.

Question 11: Increasing surface area does what to a chemical reaction?

Answer:

Increasing surface area increases the opportunity for particles to come into contact with one another. A catalyst reduces the amount of energy required for a reaction to occur. Increasing the concentration increases the chances of a collision between reactants and produces more products.

Question 12: Increasing temperature does what to a chemical reaction?

Answer:

Increasing the temperature is a way to increase the reaction rate of a chemical reaction because the increased temperature increases the chance of contact by causing particles to move around faster due to kinetic energy.

Question 13: The p-block consist of...

Answer:

boron, carbon, nitrogen, chalcogens, halogens, and noble gases.

Question 14: Chemical Equation

Answer:

is known as the recipe or the equation, the product is known as the compound or desired end result.

Question 15: The f-block consist of....

Answer:

lanthanoids and actinoids

Question 16: London Dispersion Forces (LDF)

Answer:

Weakest of all the intermolecular forces

Question 17: Reactants vs Reactions

Answer:

reactants precede the arrow of a chemical equation; they are the starting materials of the reaction. The arrow will also point in the direction of the reaction or products.

Question 18: Stoichiometry

Answer:

is the calculation of relative quantities of reactants and products in chemical reactions.

Question 19: Solvent

Answer:

part of the solution that dissolves the solute. (the greater amount)

Question 20: How is a diploe created?

Answer:

A diploe is created during a covalent bond when an electron pair is not equally shared between two atoms. Dipoles are created during covalent bonds

Question 21: Amalgams

Answer:

are solutions that use mercury to dissolve another metal type.

Question 22: Phospholipids

Answer:

contains two fatty acids and phosphate group that are joined to a glycerol.

Question 23: Which type of bond is formed when two oppositely charged ions are

electrostatically attracted?

Answer:

Ionic bonds

Question 24: The s-block of the periodic table consists of which two groups?

Answer:

Alkali metals and alkaline earth metals

Question 25: Covalent Bond

Answer:

is a chemical bond that shares one or more pairs of electrons between nuclei.

Question 26: Solute

Answer:

is a substance that can be dissolved in a solution. (the lesser amount)

Question 27: What describes an atom that is in an ionic state?

Answer:

An atom that is in an ionic state is electrically charged. An ionic state generally occurs when the atom is in a chemical compound.