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AC-HPAT Chemistry exam with complete solutions 2024_2025.
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AC-HPAT Chemistry exam with complete solutions 2024_2025.
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AC-HPAT Chemistry exam with completesolutions 2024/2025
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
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.
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
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.
What is the relation between an atomic number and a mass number? - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - ANSWER-Synthetic materials which are by-products of
petroleum are non-biodegradable, synthetic products take a long time to
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