AC-HPAT - CHEMISTRY EXAM QUESTIONS AND ANSWERS LATEST UPDATE 2025 ALREADY PASSED
double-displacement reaction - Answers is a reaction in which the positive and negative ions of two ionic
compounds exchange places to form two new compounds.
Precipitate - Answers 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 - Answers (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 - Answers 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? - Answers 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 - Answers are members of a family of an element that all have the same number of protons but
different numbers of neutrons.
Chemical Synthesis - Answers the construction of complex chemical compounds from simpler ones. It is
the process by which many substances important to daily life are obtained
Decomposition - Answers 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 - Answers is a type of chemical reaction where an element reacts with a
compound and takes the place of another element in that compound
Flame test - Answers 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
Precipitation reaction - Answers In an aqueous solution, precipitation is the process of transforming a
dissolved substance into an insoluble solid from a super-saturated solution. The solid formed is called
the precipitate
organic compounds - Answers 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 - Answers 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 - Answers measure of the tendency of an atom to attract a bonding pair of electrons.
The Pauling scale is the most commonly used.
Covalent bonds - Answers consists of the mutual sharing of one or more pairs of electrons between two
atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms
when the difference between the electronegativities of two atoms is too small for an electron transfer
to occur to form ions.
Functional Group - Answers defined as an atom or group of atoms joined in a specific manner, which
gives the chemical properties of the organic compound and are the centers for chemical reactivity
unique characteristics of the carbon atom in terms of covalent bonding - Answers Because each carbon
is identical, they all have four valence electrons, so they can easily bond with other carbon atoms to
form long chains or rings. In fact, a carbon atom can bond with another carbon atom two or three times
to make double and triple covalent bonds between two carbon atoms.
Alkenes - Answers are a class of hydrocarbons (e.g, containing only carbon and hydrogen) unsaturated
compounds with at least one carbon-to-carbon double bond.
**They are more reactive because of the double-bond
Alkane - Answers hydrocarbons in which the carbon atoms are held together by single bonds. (all
carbon-carbon bond is single)
Alkyne - Answers s a molecule that has a triple bond between two carbon atoms.
Alcohol - Answers is an organic compound that carries at least one hydroxyl functional group (−OH)
bound to a saturated carbon atom. ... An important class of alcohols, of which methanol and ethanol are
the simplest members
Aldehyde - Answers any of a class of organic compounds in which a carbon atom shares a double bond
with an oxygen atom, a single bond with a hydrogen atom, and a single bond with another atom or
group of atoms
Ketone - Answers are acids that your body makes when it breaks down fat for energy
carboxylic acid - Answers an organic compound containing a carboxyl functional group.
Ester - Answers A molecule or functional group derived by condensation of an alcohol and an acid with
simultaneous loss of water.
double-displacement reaction - Answers is a reaction in which the positive and negative ions of two ionic
compounds exchange places to form two new compounds.
Precipitate - Answers 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 - Answers (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 - Answers 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? - Answers 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 - Answers are members of a family of an element that all have the same number of protons but
different numbers of neutrons.
Chemical Synthesis - Answers the construction of complex chemical compounds from simpler ones. It is
the process by which many substances important to daily life are obtained
Decomposition - Answers 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 - Answers is a type of chemical reaction where an element reacts with a
compound and takes the place of another element in that compound
Flame test - Answers 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
Precipitation reaction - Answers In an aqueous solution, precipitation is the process of transforming a
dissolved substance into an insoluble solid from a super-saturated solution. The solid formed is called
the precipitate
organic compounds - Answers 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 - Answers 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 - Answers measure of the tendency of an atom to attract a bonding pair of electrons.
The Pauling scale is the most commonly used.
Covalent bonds - Answers consists of the mutual sharing of one or more pairs of electrons between two
atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms
when the difference between the electronegativities of two atoms is too small for an electron transfer
to occur to form ions.
Functional Group - Answers defined as an atom or group of atoms joined in a specific manner, which
gives the chemical properties of the organic compound and are the centers for chemical reactivity
unique characteristics of the carbon atom in terms of covalent bonding - Answers Because each carbon
is identical, they all have four valence electrons, so they can easily bond with other carbon atoms to
form long chains or rings. In fact, a carbon atom can bond with another carbon atom two or three times
to make double and triple covalent bonds between two carbon atoms.
Alkenes - Answers are a class of hydrocarbons (e.g, containing only carbon and hydrogen) unsaturated
compounds with at least one carbon-to-carbon double bond.
**They are more reactive because of the double-bond
Alkane - Answers hydrocarbons in which the carbon atoms are held together by single bonds. (all
carbon-carbon bond is single)
Alkyne - Answers s a molecule that has a triple bond between two carbon atoms.
Alcohol - Answers is an organic compound that carries at least one hydroxyl functional group (−OH)
bound to a saturated carbon atom. ... An important class of alcohols, of which methanol and ethanol are
the simplest members
Aldehyde - Answers any of a class of organic compounds in which a carbon atom shares a double bond
with an oxygen atom, a single bond with a hydrogen atom, and a single bond with another atom or
group of atoms
Ketone - Answers are acids that your body makes when it breaks down fat for energy
carboxylic acid - Answers an organic compound containing a carboxyl functional group.
Ester - Answers A molecule or functional group derived by condensation of an alcohol and an acid with
simultaneous loss of water.
