HESI A2 CHEMISTRY PRACTICE TEST

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HESI A2 CHEMISTRY PRACTICE TEST

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -25 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Normal body temperature is considered to be 98.6oF. What is the normal body temperature in degrees Celsius?

21° C

32° F

37° C

100° C

Answer:

37° C

Question 2: What is the oxidation number of oxygen?

1- 2- 1+

Answer:

2-

Question 3: Which of the following pH values is acidic?

11 7 13 5

Answer:

5

Question 4: Which of the following correctly defines the term isotope?

Atoms with the same number of protons and electrons, but a different number of neutrons.Atoms that have the same number of protons and neutrons, but a different number of electrons.Atoms that have different numbers of neutrons, electrons, and protons.Atoms with the same number of neutrons and electrons, but a different number of protons.

Answer:

Atoms with the same number of protons and electrons, but a different number of neutrons.

Question 5: Which of the following describes a catalyst?

A gas that evolves from the reaction A solid that precipitates out of a reaction A substance that slows down a reaction.A substance that increases the rate of a chemical reaction

Answer:

A substance that increases the rate of a chemical reaction

Question 6: What is the name given to a negatively-charged atom?

Isotope Ion Anion Cation

Answer:

Anion

Question 7: Which of the following is emitted during beta decay?

Neutron Electron Nucleus Proton

Answer:

Electron

Question 8: Which of the following solvents are lipids insoluble in?

Dichloromethane Ethanol Chloroform Water

Answer:

Water Question 9: What percentage of an original sample of iodine-131 will remain after 64 days if iodine-131 has a half-life of 8 days?

12.5 %

0.39 %

25%

6.25 %

Answer:

0.39 %

Question 10: Which of the following phase transition describes the change from ice into steam?Freezing Melting Sublimation Evaporation

Answer:

Sublimation

Question 11: What type of bonding exists in NaCl?

Synthetic Stoic Isotopic Ionic

Answer:

Ionic Question 12: Which of the following is represented by the atomic number of an element?An element's number of protons and neutrons An element's number of protons, neutrons, and electrons An element's number of protons An element's number of neutrons

Answer:

An element's number of protons

Question 13: Which of the following is not a simple sugar?

Fructose Glycogen Dextrose Glucose

Answer:

Glycogen Question 14: The mass of a grain of sand is 1.672 × 10-4 kg. Express this number in standard notation.

0.0001672 kg 0.00001672 kg 1,672 kg 1,672,000 kg

Answer:

0.0001672 kg Question 15: Which of the following is the SI unit used to measure the amount of a substance?Meter Kilogram Mole Gram

Answer:

Mole Question 16: In a redox reaction, oxidation is the _______ of electrons and reduction is the _______ of electrons.gain, gain loss, gain loss, loss gain, loss

Answer:

loss, gain Question 17: Which of the following is the correct term for chemicals on the left side of the reaction arrow?Reactants Ions Products Equation

Answer:

Reactants