| A | B |
|---|
| Atomic Mass | the total number of protons and neutrons in the nucleus |
| Atomic Number | the number of protons in the nucleus |
| Atom | the smallest particle into which an element can be divided and still be the same substance |
| Dalton's Atomic Theory | All substances are made of atoms, atoms are small particles that cannot be created, divided, or destroyed, atoms of the same element are exactly alike, and atoms of different elements are different, and atoms join with other atoms to make new substances. |
| Halogens | very reactive group of gases located on the right of the periodic table |
| Metalloids | have properties of both metals and nonmetals. |
| Noble Gases | Group of unreactive nonmetals. |
| Reactive | to undergo a chemical change |
| Controlled Experiment | a control group, an experimental group, and a variable. |
| Balanced Forces | produce a net force of zero |
| Air Resistance | Fluid friction |
| Control of Variables | change one variable in an experiment and all the other variables stay the same in the experiment |
| Motion | Any change in position over time |
| Density | the amount of matter in a given space |
| Pressure | That amount of force applied to a surface |
| Unbalanced forces | create movement |
| Newton | unit of force or weight |
| Acceleration | a change in velocity created by an object speeding up, slowing down or changing direction |
| Velocity | speed in a particular direction |
| Gravity | a force between objects that depends on their masses |
| Phase Change | when a substance changes state for example water freezing. |
| Periodic | when something happens in a repeating pattern |
| Rolling Friction | the friction between wheels and a surface |
| Analyze | to look ant information and figure out what it means |
| Derive | to discover by looking at other things. The classroom definition is that the property of the substance can be discovered by using math. |
| Sublimation | change of state that goes from a solid to a gas. |
| Pure Substance | all of the particles in a substance are the same. |
| Atomic Theory | the idea that everything is made up of tiny particles called atoms that combine with other atoms to make new things. |
| Viscosity | a liquids resistance to flow |
| Ductile | the ability of a substance to be drawn into a wire |
