| A | B |
|---|
| endothermic | heat absorbing process |
| exothermic | heat dissipating process |
| cation | any atom with a negative charge |
| anion | any atom with a positive charge |
| kinetic energy | energy of motion |
| potential energy | energy of position |
| binary compound | a compound of two elements |
| ternary compound | a compound of three elements |
| energy | capacity for doing work |
| kelvin temperature scale | freezing is 273, boiling is 373 |
| celsius temperature scale | freezing is 0, boiling is 100 |
| absolute zero | all motion stops at this temperature |
| elements | cannot be broken down by chemical change |
| compounds | can be broken down by chemical change |
| chemistry | the study of the composition of substances and the changes they undergo |
| volume | space that matter occupies |
| mass | amount of matter that an object contains |
| solution | a homogeneous mixture |
| substance | matter that has definite composition |
| matter | anything that takes up space and has mass |
| acid | a compound containing hydrogen that ionizes to yield hydrogen ions in water |
| acidic solution | any solution in which the hydrogen-ion concentration is greater than the hydroxide-ion concentration |
| alkali metal | any metal in Group 1A of the periodic table |
| atom | the smallest particle of an element that retains the properties of that element |
| atomic number | the number of protons in the nucleus of an atom of an element |
| basic solution | any solution in which the hydroxide-ion concentratin is greater than the hydrogen-ion concentration |
| bonding orbital | a molecular orbital whose energy is lower than that of the atomic orbitals from which it is formed |
| calorie | the quantity of heat that raises the temperature of 1 g. of pure water 1C |
| chemical equilibrium | a state of balance in which forward and reverse reactions are taking place at the same rate |
