AC-HPAT CHEMISTRY EXAM QUESTIONS WITH CORRECTLY
SOLVED SOLUTIONS.
1) 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 _ _
2) 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.
3) 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
4) 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.
_ _ _ _ _ _ _ _ _
5) 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.
_
, 6) 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._ _ _ _ _
7) 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.
_ _ _ _ _ _ _ _
8) 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
_ _ _ _ _ _ _ _ _ _ _ _
9) 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
_ _ _ _ _ _ _ _
10) 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.
_ _ _ _ _ _
11) 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. _ _ _ _ _
12) 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,
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
SOLVED SOLUTIONS.
1) 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 _ _
2) 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.
3) 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
4) 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.
_ _ _ _ _ _ _ _ _
5) 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.
_
, 6) 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._ _ _ _ _
7) 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.
_ _ _ _ _ _ _ _
8) 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
_ _ _ _ _ _ _ _ _ _ _ _
9) 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
_ _ _ _ _ _ _ _
10) 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.
_ _ _ _ _ _
11) 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. _ _ _ _ _
12) 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,
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
