HESI A2 Entrance Exam Chemistry

HESI A2 Entrance Exam Chemistry V1 - V2 File Latest 2023 - 2024

• If a Hydrogen is in a compound, what would its oxidation number be?

+1

• What is the oxidation number of any simple ion?

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

• How many kilograms are in a pound?

0.453592 kg

• What is the temperature for freezing point of water in Celsius?
• degrees Celsius (32°F for Fahrenheit)
• What is the conversion of Celsius to Fahrenheit?

0°C = 32°F

• What is the oxidation number of an element atom?

• What is the freezing point of sea water in Fahrenheit?

0°F

• 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?
• because the lower the pH value, the more acidic
• What is a pentose?

A 5 carbon sugar (Pent = 5) (ose = sugar)

• What is the oxidation state of the Sulfur atom in Sulfuric Acid H2SO4?

6

• How many neutrons does carbon 14 have?
• ( mass# - atomics # = neutrons) 14 - 6 = 8
• How many protons does Potassium have?

19

• How many amino acids are essential for human life?

20 amino acids

• Normal body temperature in °C?

37°C

• Normal body temperature in °F?

98.6°F

• Boiling point of water in °C?

100°C

• Boiling point of water in °F?

212°F

• 0°K is equal to °C? -273°C
• The term Amphoteric means?

A substance that can act as both a base & acid

• What is Kelvin based around? 1 / 4

Absolute zero

• A compound that is a Hydrogen or proton donor, corrosive to metals, causes blue litmus

paper to become red and becomes less acidic when mixed with a base is?Acid

• Mixture of 2 or more metals are?

Alloys

25. Acids:

33. Atomic #:

# of protons in nucleus of an atom

• Base?

• A Hydrogen or proton ACCEPTOR & has hydroxide group in the makeup of the molecule 26 .

27 .pH less than 7.0 sour/tart Formulas begin with H (Hydrogen) Proton Donor

• types of radiation in nuclear

chemistry? Alpha, Beta & Gamma

Alpha radiation:

• Emission of Helium (He) ions in

the nuclei

• Contains 2 protons & 2

neutrons.

• +2 Charge
• Largest radiation particle.
• Can be stopped by piece of

paper

• Type of Alloy in which another metal is dissolved

in Mercury (Hg)?Amalgam

• Proteins

are made up of?Amino Acids

• Glycogen is

what kind of starch? Animal Starch

• When a electron gains one or

more electrons? Anions

• Basic building

block of a molecule? Atom

(NOT CELL!!)

• Atomic mass?

Average mass of a elements isotope 2 / 4

• Produce -OH • Bitter, slippery, conduct electricity, formulas contain -OH • pH value greater than 7.0 • Proton acceptor

35. Key note:

Acids are Proton donors as Bases are proton acceptors

36. Beta radiation:

• Decomposition product of a proton or neutron • High speed/energy Electrons • EITHER - charged electrons or + charged positrons • Can be stopped by aluminum foil

• What is Biochemistry?

Study of substances & processes occurring in living things

• Fahrenheit is based off of?

Body temperature

• How does ↑ Surface area speed up chemical reactions?

By ↑ areas of contact where chemical reactions can occur

• How do catalyst accelerate a chemical reaction?

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

• What does COOH symbolize?

A Carboxyl group

• Which of the following is not a solution type?

Catalyst

• Define Catalyst.

Substance that speeds up a chemical reaction.

• What is an atom called when it LOSES 1 or more electrons?

Cations

• What is chemical bonding?

The joining of atoms to form new substances. 2 types: ionic & covalent bonding

• What is a Ionic bond?

• Electrical attraction between 2 oppositely charged atoms groups of atoms called ions • (between metals & nonmetals)

• Ionic bonding?

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

• Single Covalent bond?

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

• What are chemical reactions?

Making & breaking of chemical bonds, leading to changes in composition of matter

• Double Covalent bond? 3 / 4

When 2 electron pairs are shared

• Triple Covalent bond?

When 3 electron pairs are shared

• The following is an example of?

Combustion reaction 2C2H6 (g) + 7O2 (g)  4CO2(g) + 6H2O

• What is a combustion reaction?

A chemical reaction that occurs when a substance reacts with Oxygen, releasing energy in the form of heat & light

• What is a compound?

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

• Different types of solutions?

Compounds, Alloys, Amalgams, Emulsions

• Strongest type of chemical bond?

Covalent

• What is a decomposition reaction?

A SINGLE compound breaks down to form 2 or more simpler substances

• What is Deoxyribose?

A sugar used in the formation of DNA

• Attractions between opposite charges of polar moles?

Dipole-dipole forces

• What is a Disaccharide?

A double sugar molecule made of 2 monosaccharides bonded together through dehydration synthesis.

• When 2 monosaccharides are joined together this makes?

Disaccharide

• Type of chemical bond that share 2 electron pairs?

Double covalent bond

• Example of double replacement?

AB + CD = AD + CB

• Example of Single replacement?

A + BC  B + AC

• Group of electrons revolving around the nucleus of an atom, or known as a cloudlike

group of electrons?Electron clouds

• Mixtures of matter that readily separate such as water and oil?

Emulsion

• 3 common temperature systems?

Fahrenheit, Celsius, Kelvin

• Celsius is based around?

Freezing & boiling point of water

• What is reduction?

GAIN of electrons

• / 4