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| 191327826 | acid | A substance that increases the hydrogen ion concentration of a solution. | 0 | |
| 191327827 | acid precipitation | Rain, snow, or fog that is more acidic than pH 5.6. | 1 | |
| 191327828 | adhesion | The attraction between different kinds of molecules. | 2 | |
| 191327829 | aqueous solution | A solution in which water is the solvent. | 3 | |
| 191327830 | base | A substance that reduces the hydrogen ion concentration of a solution. | 4 | |
| 191327831 | buffer | A substance that consists of acid and base forms in a solution and that minimizes changes in pH when extraneous acids or bases are added to the solution. | 5 | |
| 191327832 | calorie (cal) | The amount of heat energy required to raise the temperature of 1 g of water by 1°C; also the amount of heat energy that 1 g of water releases when it cools by 1°C. The Calorie (with a capital C), usually used to indicate the energy content of food, is a kilocalorie. | 6 | |
| 191327833 | Celsius scale | A temperature scale (°C) equal to 5/9 (°F - 32) that measures the freezing point of water at 0°C and the boiling point of water at 100°C. | 7 | |
| 191327834 | cohesion | The binding together of like molecules, often by hydrogen bonds. | 8 | |
| 191327835 | colloid | A mixture made up of a liquid and particles that (because of their large size) remain suspended in that liquid. | 9 | |
| 191327836 | evaporative cooling | The property of a liquid whereby the surface becomes cooler during evaporation, owing to a loss of highly kinetic molecules to the gaseous state. | 10 | |
| 191327837 | heat | The total amount of kinetic energy due to molecular motion in a body of matter. Heat is energy in its most random form. | 11 | |
| 191327838 | heat of vaporization | The quantity of heat a liquid must absorb for 1 g of it to be converted from the liquid to the gaseous state. | 12 | |
| 191327839 | hydration shell | The sphere of water molecules around each dissolved ion. | 13 | |
| 191327840 | hydrogen ion | A single proton with a charge of +1. The dissociation of a water molecule (H2O) leads to the generation of a hydroxide ion (OH-) and a hydrogen ion (H+). | 14 | |
| 191327841 | hydrophilic | Having an affinity for water. | 15 | |
| 191327842 | hydrophobic | Having an aversion to water; tending to coalesce and form droplets in water. | 16 | |
| 191327843 | hydroxide ion | A water molecule that has lost a proton. | 17 | |
| 191327844 | joule (J) | A unit of energy: 1 J = 0.239 cal; 1 cal = 4.184 J. | 18 | |
| 191327845 | kilocalorie (kcal) | A thousand calories; the amount of heat energy required to raise the temperature of 1 kg of water by 1°C. | 19 | |
| 191327846 | kinetic energy | The energy of motion, which is directly related to the speed of that motion. Moving matter does work by imparting motion to other matter. | 20 | |
| 191327847 | molarity | A common measure of solute concentration, referring to the number of moles of solute per liter of solution. | 21 | |
| 191327848 | mole (mol) | The number of grams of a substance that equals its molecular weight in daltons and contains Avogadro's number of molecules. | 22 | |
| 191327849 | molecular mass | The sum of the masses of all the atoms in a molecule; sometimes called molecular weight. | 23 | |
| 191327850 | pH | A measure of hydrogen ion concentration equal to -log [H+] and ranging in value from 0 to 14. | 24 | |
| 191327851 | polar molecule | A molecule (such as water) with opposite charges on opposite sides. | 25 | |
| 191327852 | solute | A substance that is dissolved in a solution. | 26 | |
| 191327853 | solution | A liquid that is a homogeneous mixture of two or more substances. | 27 | |
| 191327854 | solvent | The dissolving agent of a solution. Water is the most versatile solvent known. | 28 | |
| 191327855 | specific heat | The amount of heat that must be absorbed or lost for 1g of a substance to change its temperature by 1°C. | 29 | |
| 191327856 | surface tension | A measure of how difficult it is to stretch or break the surface of a liquid. Water has a high surface tension because of the hydrogen bonding of surface molecules. | 30 | |
| 191327857 | temperature | A measure of the intensity of heat in degrees, reflecting the average kinetic energy of the molecules. | 31 |
