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