CHEMISTRY HESI A2 EXAM QUESTIONS

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CHEMISTRY HESI A2 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

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-Guarantee passing score -99 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Which of the following statements about atoms is false?

A.) Electrons do not orbit an atom's nucleus; they exist in electron clouds surrounding the nucleus.B.) As each orbital of an atom is filled to capacity, electrons begin occupying a higher energy orbital.C.) Most of the volume of an atom is empty space.D.) Atoms are most stable when their outer electron shell (valence shell) is incomplete.

Answer:

D.) Atoms are most stable when their outer electron shell (valence shell) is incomplete.

Question 2: A. By lowering the pressure

Answer:

What is the concentration of 58.5 g of NaC1 in 2 L of solution (atomic weights of each element are as

follows: Na = 23 g/mol, C1 = 35.5 mol)?

• 0.5 NaC1

• 0.75 mol NaC1

• 1 mol NaC1

• 2 mol NaC1

Question 3: *** a pentose is: A.) pentateuch B.) a 5-carbon sugar C.) one of the bases of the base pairs in DNA and RNA D.) found in DNA and not RNA

Answer:

B.) a 5-carbon sugar

Question 4: A.) electronegativity values for the elements involved in the bond.

Answer:

In a complete combustion reaction involving adequate amounts of oxygen and a compound containing carbon and hydrogen, the products are always?A.) carbon monoxide and oxygen B.) carbon dioxide and water C.) heat and water D.) carbon dioxide and heat Question 5: Nora makes soup by adding some spices to a pot of boiling water and stirring the spices until completely dissolved. Next, she adds several chopped vegetables. What is the solute in her mixture?A.) vegetables B.) spices C.) heat D.) water

Answer:

B.) spices

Question 6: *** how many amino acids are essential for human life

A.) 20

B.) 22

C.) as many as 585 D.) amino acids are not essential for life

Answer:

A.) 20

Question 7: Which of the following is not a state of matter?

A.) Liquid B.) Gas C.) Lattice D.) Solid

Answer:

C.) Lattice Question 8: B.) Stoichiometry is the calculation of relative quantities of reactants and products in chemical reactions.

Answer:

in a redox reaction, the element that is oxidized _____ an electron and the element that is reduced _____ an electron.A.) gains, loses B.) loses, gains C.) loses, loses D.) gains, gains

Question 9: B.) alkaline.

Answer:

Which of the following subatomic particles are found inside of an atom's nucleus?A.) Electrons, neutrons, protons B.) Neutrons, protons C.) Electrons, protons D.) Electrons

Question 10: B.) Fructose.

Answer:

Foods such as oils, milk, and butter contain high amounts of:

A.) proteins.B.) carbohydrates.C.) calcium.D.) lipids

Question 11: B.) Carboxyl group.

Answer:

Given enough time, unstable nuclei will:

A.) lose protons.B.) evolve.C.) decay into a stable form.D.) degrade into a further unstable form.

Question 12: D.) acidic, basic

Answer:

Glycolysis results in a net gain of how many ATP molecules?A.) 0 B.) 1 C.) 2 D.) 4

Question 13: A. The properties of each of the elements

Answer:

What is a pH of 7?

• Acidic

• Basic

• Neutral

• Positive

Question 14: *** glycogen is: A.) a plant starch B.) a disaccharide C.) an animal starch D.) not a starch or a disaccharide

Answer:

C.) an animal starch

Question 15: What is freezing point?

A.) The point at which a gas changes to a solid B.) The point at which a liquid changes to a gas C.) The point at which a liquid changes to a solid D.) The point at which a gas changes to a liquid

Answer:

C.) The point at which a liquid changes to a solid