Biology Exam 1 MGCCC Explore New
Questions and Answers|2025 Update |
100% Correct.
When the number of neutrons is changed, the atom destabilizes and
becomes radioactive.
Uses for Isotopes - CORRECT ANSWER-Medicine (PET scans, FDA approved
isotopes, C14 traces how carbon moves through plants, Radiometic dating..)
half life - CORRECT ANSWER-Time it takes for an atom to lose 50% of its energy
covalent bond - CORRECT ANSWER-electrons are shared
ionic bond - CORRECT ANSWER-electrons are taken
hydrogen bond - CORRECT ANSWER-weak attraction between slightly charged atoms
and a hydrogen atom
covalent bond example - CORRECT ANSWER-oxygen
ionic bond example - CORRECT ANSWER-salt
hydrogen bond example - CORRECT ANSWER-water
H2O - CORRECT ANSWER-H and 0 share electrons, but not evenly. We call this a
Polar Covalent Bond!
hydrogen bond (contd.) - CORRECT ANSWER-weak attraction between a slightly + H,
and a
slightly -atom on some other molecule.
adhesion - CORRECT ANSWER-H2O H-bonds to other H2O
cohesion - CORRECT ANSWER-H2O H-bonds to anything else
hydrogen bonds are.... - CORRECT ANSWER-wea. They form and break very easily...
like high school relationships
Collectively, hydrogen bonds are.... - CORRECT ANSWER-STRONG
, hydrophillic - CORRECT ANSWER-"water loving"
universal solvent - CORRECT ANSWER-other Polar or Ionic substances can dissolve in
H2O
solvent - CORRECT ANSWER-does the dissolving
solute - CORRECT ANSWER-gets dissolved
solution - CORRECT ANSWER-uniform mixture
hydrophobic - CORRECT ANSWER-"Water-dreading" does not mix with water
examples of hydrophobic - CORRECT ANSWER-oils/lipids (Nonpolar)
Cell membrane is made of - CORRECT ANSWER-phospholipids
Surface Tension - CORRECT ANSWER-This makes the surface of H2O "tighter".
hydrogen can't bond to air.
Evaporation - CORRECT ANSWER-"cooling effect" when water turns into a vapor
what does water do to temperature? - CORRECT ANSWER-stabilizes it
water takes __________ time to warm up and a _____________ time to cool down. -
CORRECT ANSWER-long, long
Atomic Number - CORRECT ANSWER-The Number of Protons in the
Nucleus.
Cation - CORRECT ANSWER-Atom with a positive charge (more protons than
electrons)
Anion - CORRECT ANSWER-Atom with a negative charge (more electrons than
protons)
he number of Protons CAN or CAN NOT be changed? - CORRECT ANSWER-Can
NOT (except in stars)
electrons - CORRECT ANSWER-are added as dots, starting on the
right, and move clockwise.
isotopes - CORRECT ANSWER-Change in the number of Neutrons
Questions and Answers|2025 Update |
100% Correct.
When the number of neutrons is changed, the atom destabilizes and
becomes radioactive.
Uses for Isotopes - CORRECT ANSWER-Medicine (PET scans, FDA approved
isotopes, C14 traces how carbon moves through plants, Radiometic dating..)
half life - CORRECT ANSWER-Time it takes for an atom to lose 50% of its energy
covalent bond - CORRECT ANSWER-electrons are shared
ionic bond - CORRECT ANSWER-electrons are taken
hydrogen bond - CORRECT ANSWER-weak attraction between slightly charged atoms
and a hydrogen atom
covalent bond example - CORRECT ANSWER-oxygen
ionic bond example - CORRECT ANSWER-salt
hydrogen bond example - CORRECT ANSWER-water
H2O - CORRECT ANSWER-H and 0 share electrons, but not evenly. We call this a
Polar Covalent Bond!
hydrogen bond (contd.) - CORRECT ANSWER-weak attraction between a slightly + H,
and a
slightly -atom on some other molecule.
adhesion - CORRECT ANSWER-H2O H-bonds to other H2O
cohesion - CORRECT ANSWER-H2O H-bonds to anything else
hydrogen bonds are.... - CORRECT ANSWER-wea. They form and break very easily...
like high school relationships
Collectively, hydrogen bonds are.... - CORRECT ANSWER-STRONG
, hydrophillic - CORRECT ANSWER-"water loving"
universal solvent - CORRECT ANSWER-other Polar or Ionic substances can dissolve in
H2O
solvent - CORRECT ANSWER-does the dissolving
solute - CORRECT ANSWER-gets dissolved
solution - CORRECT ANSWER-uniform mixture
hydrophobic - CORRECT ANSWER-"Water-dreading" does not mix with water
examples of hydrophobic - CORRECT ANSWER-oils/lipids (Nonpolar)
Cell membrane is made of - CORRECT ANSWER-phospholipids
Surface Tension - CORRECT ANSWER-This makes the surface of H2O "tighter".
hydrogen can't bond to air.
Evaporation - CORRECT ANSWER-"cooling effect" when water turns into a vapor
what does water do to temperature? - CORRECT ANSWER-stabilizes it
water takes __________ time to warm up and a _____________ time to cool down. -
CORRECT ANSWER-long, long
Atomic Number - CORRECT ANSWER-The Number of Protons in the
Nucleus.
Cation - CORRECT ANSWER-Atom with a positive charge (more protons than
electrons)
Anion - CORRECT ANSWER-Atom with a negative charge (more electrons than
protons)
he number of Protons CAN or CAN NOT be changed? - CORRECT ANSWER-Can
NOT (except in stars)
electrons - CORRECT ANSWER-are added as dots, starting on the
right, and move clockwise.
isotopes - CORRECT ANSWER-Change in the number of Neutrons
