Intro to Biology Unit 2- WGU (C190)
UPDATED ACTUAL Exam Questions and
CORRECT Answers
protons - CORRECT ANSWER - Positively charged particles; located in the nucleus.
relative mass of 1.0
Neutrons - CORRECT ANSWER - the particles of the nucleus that have no charge,
located in the nucleus. relative mass of 1.0
Electrons - CORRECT ANSWER - Negatively charged particles that orbit outside of the
nucleus in shells; shells fill following a specific pattern( 2 in the first shell, 8 in the next) relative
mass: negligible or 0.
Ion - CORRECT ANSWER - An atom with a positive or a negative charge.
Element - CORRECT ANSWER - is a substance that is composed of a single type of
atom.
Atomic Mass - CORRECT ANSWER - the sum of the number of protons and the number
of neutrons.
Covalent bond - CORRECT ANSWER - Strong. Occurs between atoms in the same
molecule, Electron pairs are shared, creating a strong bond between atoms.
Ionic Bond - CORRECT ANSWER - Moderately strong. Occurs between charged atoms
(ions). Electron transfer from one atom to another, resulting in a moderately strong electrostatic
attraction between oppositely charged ions.
, Hydrogen Bond - CORRECT ANSWER - Weak. Occurs between atoms in different
molecules or parts of molecules. Weak electrostatic attraction between areas of molecules with
opposite partial charges.
4 properties of water - CORRECT ANSWER - 1) excellent solvent and can dissolve a
wide range of substances.
2) it is cohesive.
3) water's temperature tends to remain stable.
4) solid water (ice) is less dense than liquid water.
solvent - CORRECT ANSWER - the component of the solution in the greatest quantity.
Solutes - CORRECT ANSWER - The components present in lower quantities.
Hydrophilic - CORRECT ANSWER - water loving
hydrophobic - CORRECT ANSWER - water-fearing or water-hating.
Cohesion - CORRECT ANSWER - Attraction between molecules of the same substance
surface tension - CORRECT ANSWER - the capacity of a liquid's surface to resist being
ruptured when placed under tension or stress.
adhesion - CORRECT ANSWER - the attraction between water molecules and other
molecules.
Water molecules form hydrogen bonds because water is ___________. - CORRECT
ANSWER - Polar
UPDATED ACTUAL Exam Questions and
CORRECT Answers
protons - CORRECT ANSWER - Positively charged particles; located in the nucleus.
relative mass of 1.0
Neutrons - CORRECT ANSWER - the particles of the nucleus that have no charge,
located in the nucleus. relative mass of 1.0
Electrons - CORRECT ANSWER - Negatively charged particles that orbit outside of the
nucleus in shells; shells fill following a specific pattern( 2 in the first shell, 8 in the next) relative
mass: negligible or 0.
Ion - CORRECT ANSWER - An atom with a positive or a negative charge.
Element - CORRECT ANSWER - is a substance that is composed of a single type of
atom.
Atomic Mass - CORRECT ANSWER - the sum of the number of protons and the number
of neutrons.
Covalent bond - CORRECT ANSWER - Strong. Occurs between atoms in the same
molecule, Electron pairs are shared, creating a strong bond between atoms.
Ionic Bond - CORRECT ANSWER - Moderately strong. Occurs between charged atoms
(ions). Electron transfer from one atom to another, resulting in a moderately strong electrostatic
attraction between oppositely charged ions.
, Hydrogen Bond - CORRECT ANSWER - Weak. Occurs between atoms in different
molecules or parts of molecules. Weak electrostatic attraction between areas of molecules with
opposite partial charges.
4 properties of water - CORRECT ANSWER - 1) excellent solvent and can dissolve a
wide range of substances.
2) it is cohesive.
3) water's temperature tends to remain stable.
4) solid water (ice) is less dense than liquid water.
solvent - CORRECT ANSWER - the component of the solution in the greatest quantity.
Solutes - CORRECT ANSWER - The components present in lower quantities.
Hydrophilic - CORRECT ANSWER - water loving
hydrophobic - CORRECT ANSWER - water-fearing or water-hating.
Cohesion - CORRECT ANSWER - Attraction between molecules of the same substance
surface tension - CORRECT ANSWER - the capacity of a liquid's surface to resist being
ruptured when placed under tension or stress.
adhesion - CORRECT ANSWER - the attraction between water molecules and other
molecules.
Water molecules form hydrogen bonds because water is ___________. - CORRECT
ANSWER - Polar
