What’s water cohesion?
polar water molecules binding to each other
What’s water adhesion?
polar water molecules binding to other things. makes most other things wet.
Water strongly repels _____________
nonpolar molecules
Water helps to maintain __________ by exhibiting a high ______ capacity
homeostasis; heat
Ion
atom of an element that DOES NOT have an equal number of protons & electrons
Base
substance that decreases H+ concentration in a solution (has OH-)
Acid
substance that increases H+ concentration in a solution
Buffer
chemicals/substances that help keep a solution at a certain pH by adding or removing H+; helps maintain homeostasis
Neutral pH level
7
Partial positive charges are attracted to ___________
partial negative charges
Top 3 Irreplaceable Resources:
topsoil, groundwater, and biodiversity
Explain why an insect can walk on water, whereas you
cannot
surface tension due to cohesion. Weight of human overcomes due to gravity; weight of insect not great enough.
When you drink a cola, you are consuming an acid. Why
doesn’t your body’s pH go down as a result?
your body’s natural buffering system takes up the extra H+ with end result not changing pH. homeostasis.
Would adding table salt to a bottle of water cause the water
to freeze to ice faster than when you place the bottle in the
freezer without adding salt?
no, bc Na+ interferes with H bonding of water molec.’s, thereby not “holding” the H’s still enough to form ice crystals easily. Think of why spreading salt on icy/snowy roads cause melting of the ice.
Would adding table salt (NaCl) to a pan of water cause the
water to come to a boil faster on a stove? Why or why not?
Yes, bc speeds up thermal reaction. Recall, Na+ attraction to partial negatively charged O. This would interfere with H bonds between water molecules themselves.
Macromolecules are _________
polymers; building material for cells & belong to either: carbohydrates, lipids, proteins, or nucleic acids. A molecule built of long chains of similar subunits (monomers.)
Phylogeny
the history of an organism & its relationship to other
species.
Carbohydrates
organic compounds that includes SUGARS
Lipids
organic compounds that includes FATS & CHOLESTEROL
Proteins
organic compounds that includes ENZYMES
Nucleic Acids
organic compounds that include DNA
An organic compound contains the element ________
Carbon (C)
Fats are polymers (T/F)
False! Strictly, fats are NOT polymers, but their fatty acid tails are added like polymers.
Polymers are built through the process of __________________
Dehydration Synthesis
