HESI A2 2025 CHEMISTRY EXAM QUESTIONS

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HESI A2 2025 CHEMISTRY EXAM QUESTIONS

Qs and Ans Expert- Explanation

This Exam contains:

-Guarantee passing score -100 Questions and Answers -format set of multiple-choice -Expert- Explanation

Question 1: 3 types of radiation in nuclear chemistry?

Answer:

Alpha, Beta & Gamma

Question 2: Normal body temperature in °F?

Answer:

98.6°F

Question 3: Polar Covalent bond?

Answer:

Unequal sharing of electrons

Question 4: Boiling point of water in °C?

Answer:

100°C

Question 5: Double Covalent bond?

Answer:

When 2 electron pairs are shared

Question 6: Mixtures of matter that readily separate such as water and oil?

Answer:

Emulsion

Question 7: Basic units of METRIC system?

Answer:

Gram, Liter Meter

Question 8: Ractant is?

Answer:

A chemical substance that is present at the start of a chemical reaction.Reactant Product

Question 9: What is an atom called when it LOSES 1 or more electrons?

Answer:

Cations

Question 10: Ionic bonding?

Answer:

Chemical bond that's formed when an atom transfers a electron to another atom.(steals)

Question 11: How many amino acids are essential for human life?

Answer:

20 amino acids

Question 12: What is reduction?

Answer:

GAIN of electrons

Question 13: Examples of intermolecular forces?

Answer:

Hydrogen bonds, dipole-dipole, dispersion forces

Question 14: Proteins are made up of?

Answer:

Amino Acids

Question 15: 3 common temperature systems?

Answer:

Fahrenheit, Celsius, Kelvin Question 16: What is the oxidation state of the Sulfur atom in Sulfuric Acid H2SO4?

Answer:

6

Question 17: Which is a example of a ionic bond?

Answer:

NaCl (Sodium Chloride) because it does not have a charge

Question 18: Emission of particles or energy from a unstable nucleus?

Answer:

Radioactivity

Question 19: Type of chemical bond that share 2 electron pairs?

Answer:

Double covalent bond Question 20: If a Hydrogen is in a compound, what would its oxidation number be?

Answer:

+1

Question 21: What is the temperature for freezing point of water in Celsius?

Answer:

• degrees Celsius (32°F for Fahrenheit)

Question 22: A way to express concentration of atoms?

Answer:

Mole Question 23: Key note:

Answer:

Acids are Proton donors as Bases are proton acceptors

Question 24: What is the freezing point of sea water in Fahrenheit?

Answer:

0°F

Question 25: What is a compound?

Answer:

? Combination of 2 or more elements or atoms.? Made up of atoms of 2 or more different elements joined by chemical bonds

Question 26: Single Covalent bond?

Answer:

? Chemical bond that shares 1 electron pair ? Formed by non-metals

Question 27: What is the oxidation number of an element atom?

Answer:

Question 28: If Oxygen is in a compound, what would its oxidation number be?

Answer:

-2