HESI A2 Chemistry Exam Newest 2024/2025 Questions
With Correct Verified Answers/Graded A+
1. Acid a compound that is a hydrogen or proton donor. It is
corrosive to metals, changes blue litmus paper red, and
becomes less acidic when mixed with bases
2. atom the basic building block of a molecule that contains a
nucleus and orbits
3. atomic mass the average mass of each of that element's isotopes
4. atomic number the number of protons in the nucleus, and it defines an
atom of a particular element
5. base a hydrogen or proton acceptor and generally has a hy-
droxide (OH) group in the makeup of the molecule. Bases
are also called alkaline compounds and are substances
that denature proteins, making them feel very slick; they
change red litmus paper blue and become less basic when
mixed with acids.
, HESI A2 Chemistry Exam
6. basic unit of standard unit of a system by which a quantity is accounted
measure for and expressed (grams, liters, or meters)
7. catalysts substances that accelerate a reaction by reducing the
activation energy or the amount of energy necessary for a
reaction to occur
8. Celsius a temperature system used in most of the world and by the
scientific community; It has these characteristics:
zero degrees = freezing point of pure water at sea level
100 degrees = boiling point of pure water at sea level.
Most people have a body temperature of 37 degrees Cel-
sius.
9. chemical equa- combination of elements or compounds called reactants
tions responding to create a product or end result. Equations
are written in the following manner: reactants ---> prod-
ucts. The arrow can go the other way or both ways
10. combustion a self sustaining exothermic chemical reaction usually
initiated by HEAT acting on OXYGEN and a fuel compound
such as hydrocarbons
, HESI A2 Chemistry Exam
11. compound the combination of two or more elements or atoms
12. covalent bond 2 atoms share electrons, generally in pairs, one from each
atom
13. decomposition a chemical reaction often described as the opposite of
synthesis because it is the breaking of a compound into
its component parts
14. deoxyribose a sugar used in the formation of DNA
15. double replace- a reaction that involves two ionic compounds. The positive
ment ion from one compound combines with the negative ion
of the other compound. The result is the two new ionic
compounds that have "switched partners"
16. electron clouds the group of electrons revolving around the nucleus of an
atom; a cloudlike group of electrons
With Correct Verified Answers/Graded A+
1. Acid a compound that is a hydrogen or proton donor. It is
corrosive to metals, changes blue litmus paper red, and
becomes less acidic when mixed with bases
2. atom the basic building block of a molecule that contains a
nucleus and orbits
3. atomic mass the average mass of each of that element's isotopes
4. atomic number the number of protons in the nucleus, and it defines an
atom of a particular element
5. base a hydrogen or proton acceptor and generally has a hy-
droxide (OH) group in the makeup of the molecule. Bases
are also called alkaline compounds and are substances
that denature proteins, making them feel very slick; they
change red litmus paper blue and become less basic when
mixed with acids.
, HESI A2 Chemistry Exam
6. basic unit of standard unit of a system by which a quantity is accounted
measure for and expressed (grams, liters, or meters)
7. catalysts substances that accelerate a reaction by reducing the
activation energy or the amount of energy necessary for a
reaction to occur
8. Celsius a temperature system used in most of the world and by the
scientific community; It has these characteristics:
zero degrees = freezing point of pure water at sea level
100 degrees = boiling point of pure water at sea level.
Most people have a body temperature of 37 degrees Cel-
sius.
9. chemical equa- combination of elements or compounds called reactants
tions responding to create a product or end result. Equations
are written in the following manner: reactants ---> prod-
ucts. The arrow can go the other way or both ways
10. combustion a self sustaining exothermic chemical reaction usually
initiated by HEAT acting on OXYGEN and a fuel compound
such as hydrocarbons
, HESI A2 Chemistry Exam
11. compound the combination of two or more elements or atoms
12. covalent bond 2 atoms share electrons, generally in pairs, one from each
atom
13. decomposition a chemical reaction often described as the opposite of
synthesis because it is the breaking of a compound into
its component parts
14. deoxyribose a sugar used in the formation of DNA
15. double replace- a reaction that involves two ionic compounds. The positive
ment ion from one compound combines with the negative ion
of the other compound. The result is the two new ionic
compounds that have "switched partners"
16. electron clouds the group of electrons revolving around the nucleus of an
atom; a cloudlike group of electrons
