AC-HPAT Chemistry Questions and Answers Updated
double-displacement reaction
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...
AC-HPAT Chemistry Questions and
Answers Updated
double-displacement reaction
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
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
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
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?
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
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
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
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
, 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
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
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
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
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
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
Covalent bonds are chemical bonds between two non-metal atoms. An example is
water, where hydrogen (H) and oxygen (O) bond together to make (H2O). A full outer
shell usually has eight electrons, or two in the case of hydrogen or helium. ... Covalent
bonds are formed by atoms sharing valence electrons.
Functional Group
The functional group is 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. Compounds having a similar functional group have
undergone similar reactions.
unique characteristics of the carbon atom in terms of covalent bonding
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
Alkenes are a class of hydrocarbons (e.g, containing only carbon and hydrogen)
unsaturated compounds with at least one carbon-to-carbon double bond. Another term
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