5 Written questions
5 Matching questions
- Describe how and why hydrogen bonds form in water.
- Why is water in the solid phase less dense? How does this support life?
- Does form impact function?
- Draw functional group structure and give molecular formula for: Phosphate.
- Why is carbon the basic building element of life?
- a Hydrogen bonds keep the molecules spread out, so they don't pack together, making them less dense.
The floating ice insulates the body of water underneath it; if ice sank, then all the bodies of water would freeze solid, making life unlivable.
- b Hydrogen bonds are the bonds between two polar molecules - one with a partial positive charge and one with a partial negative charge; water is perfect for this because it has the partial negative of Oxygen and the partial positive of Hydrogen.
- c YES!
- d Because it can bond to 4 other atoms (tetravalent - 4 valence electrons)
- e Phosphate (−OPO₃²⁻) (acid: DNA, cell membrane, ATP); P double to O, single to O, 2 O⁻
Ex: glycerol phosphate
5 Multiple choice questions
- Yes. Ex: tiny tag from a functional group determines whether we are males or females
- 4 and 4
- Special abilities water takes on when combined with itself (only works with large amounts of molecules, not just a single molecule)
- A log scale. Each change is 10 times. So when we go up or down, we add a zero to the end.
5 True/False questions
What is specific heat? → pH is the measurement used to quantify the H⁺ ion concentration in an aqueous (water) solution
What two properties of water do plants take advantage of, to move water against gravity, explain? → Yes. Ex: tiny tag from a functional group determines whether we are males or females
Draw functional group structure and give molecular formula for: Sulfhydryl.
Example? → Sulfhydryl (−SH or HS−) (protein cross-linking, stabilizes structure)
Ex: Covalent bonding w/ other sulfhydryls (disulfide bridge)
What are the different types of isomers (changes) and how are they different? → Hydrophilic - attracted to water; polar or ionic; has charge
Hydrophobic - repels water; nonpolar; no charge
Be able to recreate hydrogen bonding in water. →
(see p. 1 slide 4 in ch. 3)