HESI A2 CHEMISTRY 2024 EXAM QUESTIONS

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HESI A2 CHEMISTRY 2024 EXAM QUESTIONS

Qs and Ans Expert- Explanation

This Exam contains:

-Guarantee passing score -30 Questions and Answers -format set of multiple-choice -Expert- Explanation

Question 1: Synthesis

Answer:

combining parts into a whole

Question 2: Polar covalent

Answer:

a type of bond that forms when electrons are not shared equally

Question 3: Balancing chemical equations

Answer:

Make certain that there are equal numbers of each atom on the reactant side and the product side

Question 4: Types of reactions

Answer:

synthesis, decomposition, single replacement, double replacement, combustion

Question 5: Single replacement

Answer:

one element replaces another element in a compound A + BC --> B + AC

Question 6: Alloy

Answer:

A mixture of two or more metals

Question 7: Equilibrium

Answer:

A state of balance

Question 8: Ionic bond

Answer:

Formed when one or more electrons are transferred from one atom to another

Question 9: Hydrogen bond

Answer:

A type of weak chemical bond formed when the slightly positive hydrogen atom of a polar covalent bond in one molecule is attracted to the slightly negative atom of a polar covalent bond in another molecule.

Question 10: Protons

Answer:

Positively charged particles

Question 11: Scientific notation

Answer:

A method of writing or displaying numbers in terms of a decimal number between 1 and 10 multiplied by a power of 10.

Question 12: Bases

Answer:

Compounds that reduce the concentration of hydrogen ions in a solution.

Question 13: Different types of bonds

Answer:

covalent, ionic, hydrogen

Question 14: Decomposition

Answer:

A chemical reaction that breaks down compounds into simpler products. (AB-> B)

Question 15: Properties of water

Answer:

high polarity->hydrogen bonding-> cohesiveness-> adhesiveness ->high specific heat->high latent heat and High heat of vaporization

Question 16: Electrons

Answer:

Negatively charged particles

Question 17: Metals

Answer:

Elements that are good conductors of electric current and heat.

Question 18: Double replacement

Answer:

a chemical reaction where two elements in different compounds trade places (AB + CD = AD + CB)

Question 19: Covalent bond

Answer:

A chemical bond that involves sharing a pair of electrons between atoms in a molecule

Question 20: Isotopes

Answer:

Atoms of the same element that have different numbers of neutrons

Question 21: Neutrons

Answer:

the particles of the nucleus that have no charge

Question 22: Nonmetals

Answer:

Elements that are poor conductors of heat and electric current

Question 23: Organic compound

Answer:

Compounds that contain carbon

Question 24: Calculating molarity

Answer:

moles of solute/liters of solution

Question 25: Combustion

Answer:

the process of burning something

Question 26: Calculating density

Answer:

Density = mass/volume

Question 27: Nucleus

Answer:

Contains both protons and neutrons

Question 28: Subatomic particles

Answer:

protons, neutrons, electrons