AC-HPAT – CHEMISTRY Exam 2025 With
Correct Answers
double-displacement reaction - correct answersis a reaction in which the positive and negative ions of two
f f f f f f f f f f f f f f f f
ionic compounds exchange places to form two new compounds.
f f f f f f f f
Precipitate - correct answersis an insoluble solid that emerges from a liquid solution. The emergence of the
f f f f f f f f f f f f f f f f f
insoluble solid from solution is called precipitation. Often the precipitate emerges as a suspension.
f f f f f f f f f f f f f f
(Precipitates can form when two soluble salts react in solution to form one or more insoluble products)
f f f f f f f f f f f f f f f f
Energy Levels - correct answers(also called electron shells) are fixed distances from the nucleus of an atom
f f f f f f f f f f f f f f f f f
where electrons may be found. As you go farther from the nucleus, electrons at higher energy levels have more
f f f f f f f f f f f f f f f f f f f
energy. Electrons in the outermost energy level of an atom are called valence electrons
f f f f f f f f f f f f f
Marquis Test - correct answersis commonly used for Ecstasy testing as MDMA turns the precipitate purple
f f f f f f f f f f f f f f f f
black. Cobalt thiocyanate is used to test for cocaine. The Cobalt is mixed with the questionable substance, then
f f f f f f f f f f f f f f f f f f
drowned in hydrochloric acid, doused in chloroform, and shaken.
f f f f f f f f
, What is the relation between an atomic number and a mass number? - correct answersAtomic number is
f f f f f f f f f f f f f f f f f
actually the number of protons in an atom while mass number is the number of nucleons i. e, number of
f f f f f f f f f f f f f f f f f f f f
protons plus the number of neutrons. f f f f f
Isotopes - correct answersare members of a family of an element that all have the same number of protons but
f f f f f f f f f f f f f f f f f f f f
different numbers of neutrons. f f f
Chemical Synthesis - correct answersthe construction of complex chemical compounds from simpler ones. It
f f f f f f f f f f f f f f
is the process by which many substances important to daily life are obtained
f f f f f f f f f f f f
Decomposition - correct answersis a type of chemical reaction in which a single compound breaks down into f f f f f f f f f f f f f f f f f
two or more elements or new compounds. These reactions often involve an energy source such as heat, light,
f f f f f f f f f f f f f f f f f f
or electricity that breaks apart the bonds of compounds
f f f f f f f f
single-displacement reaction - correct answersis a type of chemical reaction where an element reacts with a f f f f f f f f f f f f f f f f
compound and takes the place of another element in that compound f f f f f f f f f f
Flame test - correct answersanalytical procedure used in chemistry to detect the presence of certain
f f f f f f f f f f f f f f f
elements, primarily metal ions, based on each element's characteristic emission spectrum. The color of flames
f f f f f f f f f f f f f f
in general also depends on temperature
f f f f f f
Precipitation reaction - correct answersIn an aqueous solution, precipitation is the process of transforming a f f f f f f f f f f f f f f f
dissolved substance into an insoluble solid from a super-saturated solution. The solid formed is called the
f f f f f f f f f f f f f f f f
precipitate
organic compounds - correct answersis a substance that is added to a product, like food, to improve some
f f f f f f f f f f f f f f f f f f
qualities such as taste, smell, colour and texture. These substances can be both positive and negative for
f f f f f f f f f f f f f f f f f
human health. f
Synthetic materials - correct answerswhich are by-products of petroleum are non-biodegradable, synthetic
f f f f f f f f f f f f
products take a long time to decompose, creating long-term pollution. Nylon is hard to recycle, making them
f f f f f f f f f f f f f f f f f
hard to decompose, accumulate landfills more. Polyesters are easy to recycle, which makes them less harmful
f f f f f f f f f f f f f f f f
to the society.
f f
Correct Answers
double-displacement reaction - correct answersis a reaction in which the positive and negative ions of two
f f f f f f f f f f f f f f f f
ionic compounds exchange places to form two new compounds.
f f f f f f f f
Precipitate - correct answersis an insoluble solid that emerges from a liquid solution. The emergence of the
f f f f f f f f f f f f f f f f f
insoluble solid from solution is called precipitation. Often the precipitate emerges as a suspension.
f f f f f f f f f f f f f f
(Precipitates can form when two soluble salts react in solution to form one or more insoluble products)
f f f f f f f f f f f f f f f f
Energy Levels - correct answers(also called electron shells) are fixed distances from the nucleus of an atom
f f f f f f f f f f f f f f f f f
where electrons may be found. As you go farther from the nucleus, electrons at higher energy levels have more
f f f f f f f f f f f f f f f f f f f
energy. Electrons in the outermost energy level of an atom are called valence electrons
f f f f f f f f f f f f f
Marquis Test - correct answersis commonly used for Ecstasy testing as MDMA turns the precipitate purple
f f f f f f f f f f f f f f f f
black. Cobalt thiocyanate is used to test for cocaine. The Cobalt is mixed with the questionable substance, then
f f f f f f f f f f f f f f f f f f
drowned in hydrochloric acid, doused in chloroform, and shaken.
f f f f f f f f
, What is the relation between an atomic number and a mass number? - correct answersAtomic number is
f f f f f f f f f f f f f f f f f
actually the number of protons in an atom while mass number is the number of nucleons i. e, number of
f f f f f f f f f f f f f f f f f f f f
protons plus the number of neutrons. f f f f f
Isotopes - correct answersare members of a family of an element that all have the same number of protons but
f f f f f f f f f f f f f f f f f f f f
different numbers of neutrons. f f f
Chemical Synthesis - correct answersthe construction of complex chemical compounds from simpler ones. It
f f f f f f f f f f f f f f
is the process by which many substances important to daily life are obtained
f f f f f f f f f f f f
Decomposition - correct answersis a type of chemical reaction in which a single compound breaks down into f f f f f f f f f f f f f f f f f
two or more elements or new compounds. These reactions often involve an energy source such as heat, light,
f f f f f f f f f f f f f f f f f f
or electricity that breaks apart the bonds of compounds
f f f f f f f f
single-displacement reaction - correct answersis a type of chemical reaction where an element reacts with a f f f f f f f f f f f f f f f f
compound and takes the place of another element in that compound f f f f f f f f f f
Flame test - correct answersanalytical procedure used in chemistry to detect the presence of certain
f f f f f f f f f f f f f f f
elements, primarily metal ions, based on each element's characteristic emission spectrum. The color of flames
f f f f f f f f f f f f f f
in general also depends on temperature
f f f f f f
Precipitation reaction - correct answersIn an aqueous solution, precipitation is the process of transforming a f f f f f f f f f f f f f f f
dissolved substance into an insoluble solid from a super-saturated solution. The solid formed is called the
f f f f f f f f f f f f f f f f
precipitate
organic compounds - correct answersis a substance that is added to a product, like food, to improve some
f f f f f f f f f f f f f f f f f f
qualities such as taste, smell, colour and texture. These substances can be both positive and negative for
f f f f f f f f f f f f f f f f f
human health. f
Synthetic materials - correct answerswhich are by-products of petroleum are non-biodegradable, synthetic
f f f f f f f f f f f f
products take a long time to decompose, creating long-term pollution. Nylon is hard to recycle, making them
f f f f f f f f f f f f f f f f f
hard to decompose, accumulate landfills more. Polyesters are easy to recycle, which makes them less harmful
f f f f f f f f f f f f f f f f
to the society.
f f
