AC-HPAT Chemistry EXAM STUDY GUIDE
2026/2027 ACCURATE QUESTIONS WITH
CORRECT DETAILED ANSWER ||
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<RECENT VERSION>
1. double-displacement reaction - ANSWER ✔ A double displacement
reaction, also known as a double replacement reaction or metathesis, is a
type of chemical reaction where two compounds react, and the positive ions
(cation) and the negative ions (anion) of the two reactants switch places,
forming two new compounds or products
2. Precipitate - ANSWER ✔ precipitate is an insoluble solid that emerges from
a liquid solution. The emergence of the insoluble solid from solution is
called precipitation. Often the precipitate emerges as a suspension.
Precipitates can form when two soluble salts react in solution to form one or
more insoluble products.
3. Energy Levels - ANSWER ✔ Energy levels (also called electron shells) are
fixed distances from the nucleus of an atom where electrons may be found.
As you go farther from the nucleus, electrons at higher energy levels have
more energy. Electrons in the outermost energy level of an atom are called
valence electrons
4. Marquis Test - ANSWER ✔ The Marquis Test is commonly used for
Ecstasy testing as MDMA turns the precipitate purple black. Cobalt
, thiocyanate is used to test for cocaine. The Cobalt is mixed with the
questionable substance, then drowned in hydrochloric acid, doused in
chloroform, and shaken.
5. Combustion Reaction - ANSWER ✔ A combustion reaction is a reaction in
which a substance reacts with oxygen gas, releasing energy in the form of
light and heat. Combustion reactions must involve O2 as one reactant. The
combustion of hydrogen gas produces water vapor. Notice that this reaction
also qualifies as a combination reaction.
6. Fermentation - ANSWER ✔ Fermentation is where all alcohol is created,
distillation is where the alcohol is separated and removed. In order for
fermentation to occur, two things are needed: a raw material in liquid form
that contains sugar, followed by the addition of yeast.
7. galvanic cell - ANSWER ✔ a device in which chemical energy is changed to
electrical energy ex. battery
8. How does the redox reaction occur in the electroplating process? -
ANSWER ✔ Plating is an oxidation-reduction reaction, where one material
gives up electrons (gets oxidized) and the other material gains electrons (gets
reduced). The anode is the electrode at which oxidation occurs, and the
cathode is the electrode at which reduction occurs. Oxidation-reduction
(redox) reactions are important because they are the principal sources of
energy on this planet, both natural or biological and artificial. Oxidation of
molecules by removal of hydrogen or combination with oxygen normally
liberates large quantities of energy.
9. Rust proofing - ANSWER ✔ Rustproofing is the prevention or delay of
rusting of iron and steel objects, or the permanent protection against
corrosion. Typically, the protection is achieved by a process of surface
, finishing or treatment. When the oil spray contacts the surface of your car it
lifts off any amount of moisture that might be clinging to it. As thin as water
itself, the oil can reach into every little seam and spot weld on your vehicle
10.cathodic protection - ANSWER ✔ Cathodic protection (CP) is a technique
used to control the corrosion of a metal surface by making it the cathode of
an electrochemical cell. A simple method of protection connects the metal to
be protected to a more easily corroded "sacrificial metal" to act as the anode.
11.Galvination - ANSWER ✔ Galvanization or galvanizing (also spelled
galvanisation or galvanising) is the process of applying a protective zinc
coating to steel or iron, to prevent rusting. The most common method is hot-
dip galvanizing, in which the parts are submerged in a bath of molten hot
zinc.
12.Electrolyte - ANSWER ✔ An ionic compound whose aqueous solution
conducts an electric current
13.Ion - ANSWER ✔ A charged atom
14.ionic bond - ANSWER ✔ Formed when one or more electrons are
transferred from one atom to another
15.redox reaction - ANSWER ✔ Oxidation-reduction reactions, commonly
known as redox reactions, are reactions that involve the transfer of electrons
from one species to another. The species that loses electrons is said to be
oxidized, while the species that gains electrons is said to be reduced.
2026/2027 ACCURATE QUESTIONS WITH
CORRECT DETAILED ANSWER ||
100% GUARANTEED PASS
<RECENT VERSION>
1. double-displacement reaction - ANSWER ✔ A double displacement
reaction, also known as a double replacement reaction or metathesis, is a
type of chemical reaction where two compounds react, and the positive ions
(cation) and the negative ions (anion) of the two reactants switch places,
forming two new compounds or products
2. Precipitate - ANSWER ✔ precipitate is an insoluble solid that emerges from
a liquid solution. The emergence of the insoluble solid from solution is
called precipitation. Often the precipitate emerges as a suspension.
Precipitates can form when two soluble salts react in solution to form one or
more insoluble products.
3. Energy Levels - ANSWER ✔ Energy levels (also called electron shells) are
fixed distances from the nucleus of an atom where electrons may be found.
As you go farther from the nucleus, electrons at higher energy levels have
more energy. Electrons in the outermost energy level of an atom are called
valence electrons
4. Marquis Test - ANSWER ✔ The Marquis Test is commonly used for
Ecstasy testing as MDMA turns the precipitate purple black. Cobalt
, thiocyanate is used to test for cocaine. The Cobalt is mixed with the
questionable substance, then drowned in hydrochloric acid, doused in
chloroform, and shaken.
5. Combustion Reaction - ANSWER ✔ A combustion reaction is a reaction in
which a substance reacts with oxygen gas, releasing energy in the form of
light and heat. Combustion reactions must involve O2 as one reactant. The
combustion of hydrogen gas produces water vapor. Notice that this reaction
also qualifies as a combination reaction.
6. Fermentation - ANSWER ✔ Fermentation is where all alcohol is created,
distillation is where the alcohol is separated and removed. In order for
fermentation to occur, two things are needed: a raw material in liquid form
that contains sugar, followed by the addition of yeast.
7. galvanic cell - ANSWER ✔ a device in which chemical energy is changed to
electrical energy ex. battery
8. How does the redox reaction occur in the electroplating process? -
ANSWER ✔ Plating is an oxidation-reduction reaction, where one material
gives up electrons (gets oxidized) and the other material gains electrons (gets
reduced). The anode is the electrode at which oxidation occurs, and the
cathode is the electrode at which reduction occurs. Oxidation-reduction
(redox) reactions are important because they are the principal sources of
energy on this planet, both natural or biological and artificial. Oxidation of
molecules by removal of hydrogen or combination with oxygen normally
liberates large quantities of energy.
9. Rust proofing - ANSWER ✔ Rustproofing is the prevention or delay of
rusting of iron and steel objects, or the permanent protection against
corrosion. Typically, the protection is achieved by a process of surface
, finishing or treatment. When the oil spray contacts the surface of your car it
lifts off any amount of moisture that might be clinging to it. As thin as water
itself, the oil can reach into every little seam and spot weld on your vehicle
10.cathodic protection - ANSWER ✔ Cathodic protection (CP) is a technique
used to control the corrosion of a metal surface by making it the cathode of
an electrochemical cell. A simple method of protection connects the metal to
be protected to a more easily corroded "sacrificial metal" to act as the anode.
11.Galvination - ANSWER ✔ Galvanization or galvanizing (also spelled
galvanisation or galvanising) is the process of applying a protective zinc
coating to steel or iron, to prevent rusting. The most common method is hot-
dip galvanizing, in which the parts are submerged in a bath of molten hot
zinc.
12.Electrolyte - ANSWER ✔ An ionic compound whose aqueous solution
conducts an electric current
13.Ion - ANSWER ✔ A charged atom
14.ionic bond - ANSWER ✔ Formed when one or more electrons are
transferred from one atom to another
15.redox reaction - ANSWER ✔ Oxidation-reduction reactions, commonly
known as redox reactions, are reactions that involve the transfer of electrons
from one species to another. The species that loses electrons is said to be
oxidized, while the species that gains electrons is said to be reduced.
