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?
- What is the pH scale?
- What are functional groups? Names?
- What is a hydrocarbon? Polar or non-polar?
- a Organic molecules composed solely of Carbon and Hydrogen; Nonpolar covalent bond so they resist/repel water (ex: fat)
- b pH is the measurement used to quantify the H⁺ ion concentration in an aqueous (water) solution
- c YES!
- d Small organic molecules with great effects:
Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, and Methyl
- e Cohesion and Adhesion.
Cohesion - waters ability to stick to ITSELF (other water molecules)
Adhesion - waters ability to stick to OTHER THINGS that are POLAR
5 Multiple choice questions
- Hydroxyl (polar, form hydrogen bonds, polar solvents)
−OH (may be written HO-)
Ex: Alcohols, such as Ethanol
- 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.
- 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
- Special abilities water takes on when combined with itself (only works with large amounts of molecules, not just a single molecule)
- 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
5 True/False questions
Describe the terms: solvent, solute, and solution. → Solvent: Substance doing the dissolving (water)
Solute: Substance being dissolved (sugar or salt)
Solution: homogenous mixture (product of solvent & solute)
What is heat of vaporization? How does it relate to evaporative cooling? What affect does it have on living organisms? → Organic molecules composed solely of Carbon and Hydrogen; Nonpolar covalent bond so they resist/repel water (ex: fat)
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.
What is a buffer? → A log scale. Each change is 10 times. So when we go up or down, we add a zero to the end.
Organic molecules must always contain what? → WATER!