BIO SCI 93 Midterm #1 Exam Questions with Revised Correct Detailed Answers with Rationales Guaranteed Pass
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Course
BIO SCI 93
Institution
BIO SCI 93
BIO SCI 93 Midterm #1 Exam Questions with Revised Correct Detailed Answers with Rationales Guaranteed Pass
What is a hypothesis? - Answers - a testable explanation to a question (can never be proven)
What is a prediction? - Answers - a statement about an uncertain event
What is an experime...
BIO SCI 93 Midterm #1 Exam Questions
with Revised Correct Detailed Answers
with Rationales Guaranteed Pass
What is a hypothesis? - Answers -✔✔ a testable explanation to a question (can never
be proven)
What is a prediction? - Answers -✔✔ a statement about an uncertain event
What is an experiment? - Answers -✔✔ a scientific test (to show if the hypothesis was
accepted or rejected), carried out in controlled conditions
How is a theory different than a hypothesis? - Answers -✔✔ a theory is broader in
scope, general enough to spin a new testable hypothesis, and it is generally supported
by a greater body of evidence
What is the difference between an element and a compound? - Answers -✔✔ an
element cannot be broken down to other substances by chemical reactions & a
compound is made up of two or more DIFFERENT elements
What is the difference between a single bond and a double bond? - Answers -✔✔ a
single bond is a pair of shared valence electrons & a double bond is the sharing of two
pairs of valence electrons
What is electronegativity? - Answers -✔✔ the attraction of a particular atom for the
electrons of a covalent bond (think oxygen and hydrogen). non polar covalent bonds
share the electrons equally because the atoms sharing them, are equal in
electronegativity; unlike polar bonds (H2O)
What is a salt? - Answers -✔✔ compounds formed by ionic bonds (NaCl)
What are Van der Waals interactions? - Answers -✔✔ weak forces that occur only
when atom and molecules are very close together. they occur because electrons are
not always evenly distributed. (ex: gecko walking on a wall)
Why does it mean when a reaction has reached chemical equilibrium? - Answers -✔✔
It mens is has reached the point at which the reactions offset one another exactly.
What is a molecule? - Answers -✔✔ Two or more atoms covalently bonded together
What is the difference between a non-polar covalent bond and polar covalent bond? -
Answers -✔✔ A non polar covalent bond is a bond where the electrons are being
, shared equally and the restructure of the molecule is equal if you cut it n half (CH4). A
polar covalent bond is a bond that does not share the electrons Evelyn because of the
difference in electronegativity amongst the atoms (H2O)
What is an ionic bond? - Answers -✔✔ A bond between a cation (+) and an anion (-)
where an electron is taken/given
What is hydrogen bond? - Answers -✔✔ A weak bond between two molecules resulting
from the attraction between a proton in one molecule and an electronegative atom in the
other (H2O)
What is a chemical reaction? - Answers -✔✔ The making and breaking of chemical
bonds, leading to changes in the composition of matter. The reactant in a reaction is the
stating material and the product is what you get after the reaction.
What is a solution, solvent, and solute, and an aqueous solution? - Answers -✔✔
Solution: a liquid that is a complete homogenous mixture of two or more substances.
Solvent: a dissolving agent.
Solute: a substance that is dissolved.
Aqueous solution: the solute is dissolved in water; water is the universal solvent
What is the difference between an acid and a base? - Answers -✔✔ Acid: a substance
that increases the hydrogen ion concentration in a solution. Base: a substance that
reduces the hydrogen concentration/increases hydroxide concentration in a solution
(some accept hydrogen ions like NH3 + H+ --> NH4+). Strong acids and bases don't
dissociate completely in water.
What is the pH scale and what is a buffer? - Answers -✔✔ pH scale measure how
acidic or basic a solution is and a buffer is a substance that minimizes changes in [H+]
and [OH-] in a solution. Most buffers contain a weak acid and its corresponding base,
which combines with H+
What are functional groups? - Answers -✔✔ Chemical groups that are directly involved
in chemical reactions. Each functional group has different properties; such as shape
and change, that cause it to participate in a certain way.
Hydroxyl group - Answers -✔✔ Forms hydrogen bonds with water because of its
polarity and it helps dissolve compounds like sugar. An example is ethanol which is an
alcohol (its compound name)
Carbonyl group - Answers -✔✔ Compound name: Ketone. Polar. The sugars with
ketone group= ketoses and sugars with aldehydes= aldoses. A ketone is a carbonyl
group within the carbon skeleton. An aldehyde is the carbonyl group at the end of the
carbon skeleton. An example is acetone (simplest ketone) and propanal (aldehyde).
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