AC-HPAT Chemistry UPDATED Exam
Questions and CORRECT Answers
double-displacement reaction - Correct 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
Precipitate - Correct 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.
Energy Levels - Correct 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
Marquis Test - Correct 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.
What is the relation between an atomic number and a mass number? - Correct Answer-
Atomic number is actually the number of protons in an atom while mass number is the
number of nucleons i. e, number of protons plus the number of neutrons.
Isotopes - Correct Answer- Isotopes refer to the nuclides of a certain element that have
different numbers of neutrons, or in other words, atomic nuclei that have the same number of
protons but different numbers of neutrons. A radioisotope is an isotope that is unstable and
therefore undergoes radioactive decay or will at some point.
Chemical Synthesis - Correct Answer- Chemical synthesis, the construction of complex
chemical compounds from simpler ones. It is the process by which many substances
important to daily life are obtained. It is applied to all types of chemical compounds, but most
syntheses are of organic molecules.
, Decomposition - Correct Answer- A decomposition reaction is a type of chemical reaction in
which a single compound breaks down into two or more elements or new compounds. These
reactions often involve an energy source such as heat, light, or electricity that breaks apart the
bonds of compounds
single-displacement reaction - Correct Answer- A single-displacement reaction, also known
as a single-replacement reaction, is a type of chemical reaction where an element reacts with
a compound and takes the place of another element in that compound. This type of reaction is
typically pictured like this: Here, A replaces B in the compound BC
Flame test - Correct Answer- flame test is an analytical procedure used in chemistry to detect
the presence of certain elements, primarily metal ions, based on each element's characteristic
emission spectrum. The color of flames in general also depends on temperature; see flame
color.
Precipitation reaction - Correct Answer- A precipitation reaction refers to the formation of an
insoluble salt when two solutions containing soluble salts are combined. The insoluble salt
that falls out of solution is known as the precipitate, hence the reaction's name. Precipitation
reactions can help determine the presence of various ions in solution.
organic compounds - Correct Answer- An organic compound is a substance that is added to a
product, like food, to improve some qualities such as taste, smell, colour and texture. These
substances can be both positive and negative for human health.
Synthetic materials - Correct Answer- Synthetic materials which are by-products of
petroleum are non-biodegradable, synthetic products take a long time to decompose, creating
long-term pollution. Nylon is hard to recycle, making them hard to decompose, accumulate
landfills more. Polyesters are easy to recycle, which makes them less harmful to the society.
Electronegativity - Correct Answer- Electronegativity is a measure of the tendency of an atom
to attract a bonding pair of electrons. The Pauling scale is the most commonly used. Fluorine
(the most electronegative element) is assigned a value of 4.0, and values range down to
caesium and francium which are the least electronegative at 0.7.
Covalent bonds - Correct Answer- Covalent bonds are chemical bonds between two non-
metal atoms. An example is water, where hydrogen (H) and oxygen (O) bond together to
Questions and CORRECT Answers
double-displacement reaction - Correct 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
Precipitate - Correct 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.
Energy Levels - Correct 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
Marquis Test - Correct 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.
What is the relation between an atomic number and a mass number? - Correct Answer-
Atomic number is actually the number of protons in an atom while mass number is the
number of nucleons i. e, number of protons plus the number of neutrons.
Isotopes - Correct Answer- Isotopes refer to the nuclides of a certain element that have
different numbers of neutrons, or in other words, atomic nuclei that have the same number of
protons but different numbers of neutrons. A radioisotope is an isotope that is unstable and
therefore undergoes radioactive decay or will at some point.
Chemical Synthesis - Correct Answer- Chemical synthesis, the construction of complex
chemical compounds from simpler ones. It is the process by which many substances
important to daily life are obtained. It is applied to all types of chemical compounds, but most
syntheses are of organic molecules.
, Decomposition - Correct Answer- A decomposition reaction is a type of chemical reaction in
which a single compound breaks down into two or more elements or new compounds. These
reactions often involve an energy source such as heat, light, or electricity that breaks apart the
bonds of compounds
single-displacement reaction - Correct Answer- A single-displacement reaction, also known
as a single-replacement reaction, is a type of chemical reaction where an element reacts with
a compound and takes the place of another element in that compound. This type of reaction is
typically pictured like this: Here, A replaces B in the compound BC
Flame test - Correct Answer- flame test is an analytical procedure used in chemistry to detect
the presence of certain elements, primarily metal ions, based on each element's characteristic
emission spectrum. The color of flames in general also depends on temperature; see flame
color.
Precipitation reaction - Correct Answer- A precipitation reaction refers to the formation of an
insoluble salt when two solutions containing soluble salts are combined. The insoluble salt
that falls out of solution is known as the precipitate, hence the reaction's name. Precipitation
reactions can help determine the presence of various ions in solution.
organic compounds - Correct Answer- An organic compound is a substance that is added to a
product, like food, to improve some qualities such as taste, smell, colour and texture. These
substances can be both positive and negative for human health.
Synthetic materials - Correct Answer- Synthetic materials which are by-products of
petroleum are non-biodegradable, synthetic products take a long time to decompose, creating
long-term pollution. Nylon is hard to recycle, making them hard to decompose, accumulate
landfills more. Polyesters are easy to recycle, which makes them less harmful to the society.
Electronegativity - Correct Answer- Electronegativity is a measure of the tendency of an atom
to attract a bonding pair of electrons. The Pauling scale is the most commonly used. Fluorine
(the most electronegative element) is assigned a value of 4.0, and values range down to
caesium and francium which are the least electronegative at 0.7.
Covalent bonds - Correct Answer- Covalent bonds are chemical bonds between two non-
metal atoms. An example is water, where hydrogen (H) and oxygen (O) bond together to
