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Drawing & Naming
Biomolecules
Calculate!
SPECIAL TERM TIME
Molecular Behavior
100

Draw the Lewis dot structure for nitrogen trifluoride. Then predict the molecular shape and molecular polarity.

triangular planar, nonpolar (N in middle, 3 Fs on side w valence electrons!)

100

Nuts are very high in protein, but eating purely nuts is not enough to ensure that your body will receive adequate protein. Is this a contradiction? Explain your thinking.

We need to eat ALL ESSENTIAL AMINO ACIDS (some we can only get from certain foods)

100

What is the molar mass of glucose?

180.16

100
What structure controls what comes into and out of the cell?

The cell membrane.

100
Why does heptanol have a higher boiling point than pentane?

POLARITY (heptanol has stronger IM attractions)

200

Write the name: Al(NO3)3

aluminum nitrate

200

Mary says the following: "The reason that the lactose stops converting into glucose in the milk is that we've used up all the lactase in the reaction." Is she right? Explain.

No, enzymes are reusable! They are not used up in reactions (they are like tools). 

200

You find a mysterious blue substance in the science classroom. You know it is either copper sulfate or glucose died blue. How can you determine which it is?

Solubility!!!

200

This form of "eating" things that protists (and other cells) do requires ATP and involves engulfing particles outside the cell. What is this process called?

Endocytosis.

200

Explain how soap molecules orient themselves to form bubbles in air. 

NONPOLAR tails facing outward AND inward (air on both sides)
300

Write the formula: cesium selenide

Cs2Se

300

Collagen is an example of a ______, while cellulose is an example of a ________.

Protein/polypeptide, polysaccharide. 

300

If two solutions have the following molarities, where would water move in a dialysis tubing set-up with a semi-permeable membrane?

Solution A: 0.9M NaCl

Solution B: 0.4M C6H12O6

From B to A! 
300

Why is the term "hydrogen bonding" slightly inaccurate/confusing? Explain.

It is not a bond, but a particularly strong dipole-dipole attraction.

300
What kind of IM attraction(s) would form between ethanol and hexane?

ID-ID and dipole-ID

400

Name and write the chemical formula for the compound made of silicon and fluorine that has a tetrahedral shape.

silicon tetrafluoride

    SiF4

400

How do amino acids bond? Be SPECIFIC!

N of the amino and C of the carboxyl form a polar covalent bond through dehydration synthesis (which requires an enzyme). 

400

How could you make 200 ml of 0.2M magnesium sulfate solution? 

Add 4.82g of magnesium sulfate to your 200 ml of water. 

400

What is molarity describing? Be specific!

The number of particles in a solution (concentration). NOT number of grams!

400

How does a base denature an enzyme? Explain.

IONS come off of the base (OH-) and break IM attractions between amino acids. 

500

What is the chemical formula for butane?

C4H10

500

Draw the cell membrane. Why do we call it a "fluid mosaic"? What specific properties of the molecules involved demonstrate form=function?

Phospholipids (unsaturated = fluid), and proteins (channels/signaling) that are specific to their purpose (mosaic). 

500

Colby adds 50 g of hydrochloric acid to 150 mL of water. What concentration is the solution they created?

9.13M (50 g/36.45 g HCl)

500
What are the equations for cellular respiration and photosynthesis, and how are they related?

glucose + 6O2 -> 6CO2 + 6H2O + 36 ATP

Photosynthesis: Same but reversed, except energy is sunlight, not ATP