HESI A2 Chemistry (V1 & V2) EXAM MOST TESTED QUESTIONS AND VERIFIED SOLUTIONS/GET IT 100% ACCURATE!! 2026!!

If a hydrogen is in a compound, what would its oxidation number be

+1

What is the oxidation number for any SIMPLE ion

+1 or -1 depending on the charge of the ion

How many kilograms are in a pound

0.45

What is the temperature for freezing point of water in Celsuis

0 degrees

What is teh conversation of celsius to fahrenheit

0C = 32F

What is the oxidation number of an element atom

0

What is the freezing point of sea water in fahrenheit

0F

How many amino acids are in a dipeptide

2

If oxygen is in a compound, what would its oxidation number be

-2

Which of the following pH values would lemon juice likely have

2

What is a pentose

5 carbon sugar

What is the oxidation state of the sulfur atom in sulfuric acid (H2SO4)

6

How many neutrons does carbon 14 have

8

How many protons does potassium have

19

How many amino acids are essential for human life

20 amino acids

0 K is equal to ____ C

-273

What does amphoteric mean

a substance that can act as a acid or base

What is Kelvin based around

absolute zero

A couple that is a hydrogen or proton donor, corrosive to metals, cause blue litmus paper becomes red and becomes less acidic when mixed with a base is

acid

Mixture of 2 or more metals are

alloys

Acids are:

proton donors (H+)

Alpha radiation has a + ___ and contains ____ protons and ____ neutrons; they admit ____ ions

+2, 2, 2, Helium

Type of alloy in which another metal is dissolved in Mercury

amalgam

Proteins are made up of

amino acids

Glycogen is what kind of starch

animal starch

When an electron gains one or more electrons

Anion

Basic building block of a molecule

atom

Bases are:

Proton accepts (-OH)

Beta radiation has a ___ charge; they _______ products of protons or neutrons

+ or -, decomposition of a proton or neutron

How do catalysts accelerate a chemical recation

By reducing the amount of energy needed for a reaction to occur

Define catalyst

Substances that speeds up a chemical reaction

What is an atom called when it LOSES 1 or more electron

Cation

What is chemical bonding

The joining of an atom to form a new substance, Ionic and Covalent

What is an ionic bond

electrical attraction between 2 oppositely charged atoms (between metals and nonmetals)

Ionic bonding:

formed when an atom transfers an electron to another atom

Single covalent bone

1 shared electron pair (non-metal)

Double covalent bond

2 shared electron pairs

Triple covalent bond

3 shared electron pairs

Combustion reaction products:

CO2 and H2O, releases energy in the form of heat and light

4 Different types of solutions

Compounds, Alloys, Amalgams, Emulsion

What is deoxyribose

A sugar used in the formation of DNA

attraction between opposite charges of a polar mole

dipole-dipole force

Mixtures of matter that readily seperates such as water and oil

Emulsion

What are hydrogen bonds

weak attraction between a hydrogen atom and another atom

Examples of intermolecular forces

London dispersion, dipole-dipole, hydrogen bonding

gluconegogenesis refers to:

Glucose from proteins and fats

What is the molarity formula

moles of solute/liters of solution

How does an increase in concentration cause reaction acceleration?

More potential for contact

What is an example of an ionic bond

NaCl, no charge

In a covalent bond compound, if the electrons are shared equally, then the bond is:

non-polar

Polar covalent bond:

unequal sharing of electrons

How many electron ions does oxygen ion have

8

What is the mass of 1 mol or CO2

44g/mol

What is the charge of K in KCL

+1

How many moles are present in 2 mol of O2

1.204 x 10^24

Dispersions forces are found in which covalent bond

non-polar

Strongest bone of intermolecular forces

hydrogen bone

Charge of Noble Gases

0

Group 1A charge

+1

Group IIA charge

+2

Group III3 charge

+3

Group VA charge

-3

Group VIA charge

-2

Group VIIA charge

-1

How are elements arranged on the periodic table?

by increasing atomic number