| A | B |
|---|
| Matter | Everything that makes up the world around you; anything that has mass and volume |
| Mass | the amount of matter in an onject |
| volume | the amount of space an object takes up |
| density | the amount of mass in a certain volume of materials; found by dividing the mass of an object by its volume |
| physical property | a property that can be observed without changing the identity |
| physical change | a change in size, shape, or state without forming a new substance |
| solution | a mixture of one substance dissolved in another so that the properties are the same throughout |
| element | a substance that cannot be broken down any further into anything simpler |
| atom | the smallest particle |
| nucleus | the densest part of an atom where most of its mass is located |
| proton | charged particle inside an atom's nucleus |
| neutron | a particle with no charge inside an atom's nucleus |
| electron | a negatively charged particle that moves around an atom's nucleus |
| atomic number | the number of protons in an atom |
| metal | any of a group of elements that conducts heat and electricity, and is shiny and bendable |
| chemical change | a change in matter that produces a new substance with different properties from the original |
| compound | a chemical combination of two or more elements |
| chemical bond | a link that atoms or atomic sized particles can form with each other |
| chemical formula | a way of using letters and numbers to show how much of each element is in a substance |
| chemical property | a way of describing a substance by how it reacts chemically to other substances |
| ion | an electrically charged particle with unequal numbers of protons and electrons |
| molecule | a group of tightly bonded atoms that acts like a single particle |
| exothermic | a reaction that gives off heat |
| endothermic | a reaction that absorbs heat |
