5 Written questions
5 Matching questions
- What two properties of water do plants take advantage of, to move water against gravity, explain?
- Does form impact function?
- Know functional group NAMES, MOLECULAR FORMULAS, and STRUCTURES!
- Draw functional group structure and give molecular formula for: Hydroxyl.
- Draw functional group structure and give molecular formula for: Carboxyl.
- a Cohesion and Adhesion.
Cohesion - waters ability to stick to ITSELF (other water molecules)
Adhesion - waters ability to stick to OTHER THINGS that are POLAR
- b Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, and Methyl
- c Carboxyl (-COOH) acidic properties, components of many biologically important molecules; C double bonded to O and single to OH
Ex: Formic acid or acetic acid
- d Hydroxyl (polar, form hydrogen bonds, polar solvents)
−OH (may be written HO-)
Ex: Alcohols, such as Ethanol
- e YES!
5 Multiple choice questions
- Hydrogen bonds in water hold each other together stronger than they'd bond to the air, for example. Ex: Jesus Christ lizard can walk on water because of it's surface tension; a dragonfly has non-polar exoskeleton so water beads on it
- Organic molecules composed solely of Carbon and Hydrogen; Nonpolar covalent bond so they resist/repel water (ex: fat)
- Solvent: Substance doing the dissolving (water)
Solute: Substance being dissolved (sugar or salt)
Solution: homogenous mixture (product of solvent & solute)
- Methyl (−CH₃) (sex hormones, DNA methylation (when it gets tagged onto your DNA); C single bonded to 3 H's
−C − H
Ex: 5-methyl cytidine
- Resistance to change in temperature
5 True/False questions
Why is water in the solid phase less dense? How does this support life? → 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.
Organic molecules must always contain what? → WATER!
Describe how and why hydrogen bonds form in water. → 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.
What is the pH scale? → pH is the measurement used to quantify the H⁺ ion concentration in an aqueous (water) solution
What is the Universal Solvent? → WATER!