| A | B |
|---|
| atom | smallest particle of an element; the building block of matter |
| atomic number | the number of protons in an atom's nucleus |
| chemical change | a reaction between substances that results in the formation of new substances with different properties |
| chemical formula | letters and numbers that tell the types and numbers of atoms in a single molecule |
| chemical property | a characteristic of a substance that describes what will happen when it interacts with other substances |
| chemical reaction | process in which the physical and chemical properties of substances are changed into different substances that have their own physical and chemical properties |
| compound | a chemical substance that is made up of 2 or more different kinds of atoms that are bonded together |
| element | a substance that cannot be broken down by chemical or physical processes |
| endothermic | type of chemical change that absorbs heat energy from the surroundings |
| exothermic | type of chemical change that releases heat energy |
| indication | evidence that a chemical reaction is occurring |
| molecule | smallest part of a substance that is made up of two or more atoms |
| periodic table | visual representation of all elements arranged in increasing atomic number and grouped according to similar properties |
| product | substance formed from a chemical reaction |
| proton | a positively charged particle in an atom's nucleus |
| reactant | one of the original substances in a chemical reaction |
