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[BROCK UNIVERSITY] BIOL 1P91
MIDTERM EXAM ACTUAL 2025/2026
QUESTIONS AND 100% CORRECT
ANSWERS
The smallest functional unit in living organisms - (ANSWER)Atoms
The three subatomic particles - (ANSWER)protons, neutrons, electrons
Where the neutrons and protons are found - (ANSWER)The atomic nucleus
What was Rutherford's experiment? - (ANSWER)A fine beam of positively
charged alpha particles (helium nuclei) was aimed at an extremely thin sheet of
gold. A zinc sulphide screen was used to detect any alpha particles that passed
through or bounced off.
What shape are "s" orbitals? - (ANSWER)Spherical
What shape are "p" orbitals? - (ANSWER)Propeller or dumbbell shaped.
How many electrons can an orbital hold? - (ANSWER)2 electrons
What happens when the outer orbital isn't full? - (ANSWER)The tend to share
,2
What are valence electrons? - (ANSWER)Electrons in the outermost shell
What is the atomic number? - (ANSWER)The number of protons in the atom
What unit is atomic mass measure in? - (ANSWER)Daltons
What is Avagadro's number? - (ANSWER)The amount of atoms in 1 mole
(6.022e23)
What is different between isotopes? - (ANSWER)The number of neutrons
What are radioisotopes? - (ANSWER)Unstable isotopes
What is a major use of radioisotopes? - (ANSWER)Modern medicine
What are the four main elements of life? - (ANSWER)Oxygen, carbon, hydrogen,
nitrogen
How much of a living organism is made up of the four main elements? -
(ANSWER)95%
What is a molecule? - (ANSWER)Two or more atoms bonded together
, 3
How do covalent bonds join atoms? - (ANSWER)By sharing electrons
What is electronegativity? - (ANSWER)The measure of it ability to attract
electrons in a bond
What is a polar covalent bond? - (ANSWER)A covalent bond in which electrons
are not shared equally
What is another word for a polar molecule? - (ANSWER)Dipole
What is a polar molecule? - (ANSWER)Molecules with a significant number of
polar bonds
What is an ionic bond? - (ANSWER)A chemical bond that's formed when an atom
transfers and electron to another atom
What is a cation? - (ANSWER)A positively charged ion
What is an anion? - (ANSWER)A negatively charged ion
What are free radicals? - (ANSWER)A molecule containing an atom with a single,
unpaired electron in its outer energy shell.
[BROCK UNIVERSITY] BIOL 1P91
MIDTERM EXAM ACTUAL 2025/2026
QUESTIONS AND 100% CORRECT
ANSWERS
The smallest functional unit in living organisms - (ANSWER)Atoms
The three subatomic particles - (ANSWER)protons, neutrons, electrons
Where the neutrons and protons are found - (ANSWER)The atomic nucleus
What was Rutherford's experiment? - (ANSWER)A fine beam of positively
charged alpha particles (helium nuclei) was aimed at an extremely thin sheet of
gold. A zinc sulphide screen was used to detect any alpha particles that passed
through or bounced off.
What shape are "s" orbitals? - (ANSWER)Spherical
What shape are "p" orbitals? - (ANSWER)Propeller or dumbbell shaped.
How many electrons can an orbital hold? - (ANSWER)2 electrons
What happens when the outer orbital isn't full? - (ANSWER)The tend to share
,2
What are valence electrons? - (ANSWER)Electrons in the outermost shell
What is the atomic number? - (ANSWER)The number of protons in the atom
What unit is atomic mass measure in? - (ANSWER)Daltons
What is Avagadro's number? - (ANSWER)The amount of atoms in 1 mole
(6.022e23)
What is different between isotopes? - (ANSWER)The number of neutrons
What are radioisotopes? - (ANSWER)Unstable isotopes
What is a major use of radioisotopes? - (ANSWER)Modern medicine
What are the four main elements of life? - (ANSWER)Oxygen, carbon, hydrogen,
nitrogen
How much of a living organism is made up of the four main elements? -
(ANSWER)95%
What is a molecule? - (ANSWER)Two or more atoms bonded together
, 3
How do covalent bonds join atoms? - (ANSWER)By sharing electrons
What is electronegativity? - (ANSWER)The measure of it ability to attract
electrons in a bond
What is a polar covalent bond? - (ANSWER)A covalent bond in which electrons
are not shared equally
What is another word for a polar molecule? - (ANSWER)Dipole
What is a polar molecule? - (ANSWER)Molecules with a significant number of
polar bonds
What is an ionic bond? - (ANSWER)A chemical bond that's formed when an atom
transfers and electron to another atom
What is a cation? - (ANSWER)A positively charged ion
What is an anion? - (ANSWER)A negatively charged ion
What are free radicals? - (ANSWER)A molecule containing an atom with a single,
unpaired electron in its outer energy shell.
