Lecture 3 Flashcards Preview

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Flashcards in Lecture 3 Deck (17):
1

acid

A substance that increases the hydrogen ion concentration of a solution. An acid is low on the pH scale

2

adhesion

The clinging of one substance to another such as water to plant cell walls, by means of hydrogen bonds. (This is how a miniscus is formed in a test tube.

3

base

A substance that reduces the Hydrogen ion concentration. A base has more Hydroxides. It is higher on pH scale.

4

buffer

A solution containing a weak acid & corresponding base. A buffer minimizes changes in pH when acids or bases are added.

5

cohesion

Linking together of like molecules. Often by H-bonds. Related to surface tension.

6

heat

Thermal energy in transfer of one body of matter to another. NOT TEMPERATURE. It is the TOTAL quantity of kinetic energy due to molecular motion.

7

hydrogen ion

Positively charged hydrogen atom. Lost it's ONLY electron. Happens when H2O splits into OH and H

8

hydrophilic

Having an affinity for water

9

hydrophobic

Having an aversion for water

10

molarity

The measure of a solute concentration. Refers to number of moles of solute per liter of solution.

11

mole (mol)

1 mole = total # of daltons in grams
1 mole = 6.02 x 10^23 molecules
Proton/neutron = 1 dalton

12

pH

A measure of Hydrogen ion concentration

13

polar molecule

Molecule with an uneven distribution of charges in different regions of the Mol'c

14

solute

Substance dissolved in a solution

15

solution

Solvent + Solute = Solution

16

solvent

Dissolving agent of a solution.
Note: Water is most versatile solvent known.

17

temperature

The AVERAGE measure of kinetic energy due molecular movement.