| A | B |
|---|
| Atom | The smallest unit of an element, that still retains the properties of that element |
| Element | A pure substance |
| Proton | Positive charged particles in an atom. |
| Neutron | Neutral charged particles in an atom. |
| Electron | Negatively charged particles in an atoms. |
| Periodic Table | A table organizing elements. |
| How many elements are in the periodic table | 109 |
| What holds atoms together? | Chemical bonds |
| Compound | a pure substance formed from chemical combinations of two or more elements |
| Weight | The measure of the force of gravity on an object |
| Mass | The measure of how much matter an object contains |
| Density | How much mass is contained in a given volume |
| Molecule | A group of atoms that are bonded together and act as a single unit |
| Solid | A substance with a definate volume and a definate shape |
| Liquid | A substance with a definate volume but no definate shape |
| Gas | A substance without a definate volume or shape |
| Viscosity | The resistance of a liquid to flowing |
| Fluid | A substance that flows |
| Thermal energy | Energy from the movement of particles |
| Chemical energy | Energy from chemical bonds within matter |
| Vaporization | Changing from a liquid to a gas |
| Boiling | Vaporization that takes place within a liquid |
| Evaporation | Vaporization that takes place only on the surface of a liqid |
| Sublimation | Going directly from a solid to a gas |
| Atomic mass | The number of protons plus neutrons in an atom |
| Atomic number | The number of protons OR electrons in an atom |
| Protons | The positively charged particles in an atom |
| Neutrons | The neutral particles in an atom |
| Electrons | The negatively charged particles |
| Group or Family | A column in a periodic table |
| Period | A row in a periodic table |
| Valence electrons | The electrons involved in the bonding of atoms |
| Malleable | Materials that can be pounded into various shapes |
| Ductile | Materials that can be pulled out into long wire |
| Conductors | Able to transmit heat and electricity |
| Alloy | A mixture of metals |
| Alkali metals | The most reactive of all metals |
| Alkaline earth metals | The second group or family of elements |
| Transition metals | The largest group of metals |
| Halogens | The salt formers |
| Pure Substances | Sugar and salt are examples of these |
| Physical change | A change that alters the form of a substance without changing it to a new substance |
| Chemical change | burning paper, heating sugar, baking cookies are all examples |
| Volume | how much matter an object contains |
| Density | mass divided by volume |
| Chemical bonds | bonds that hold atoms together |
| Law of conservation of energy | states that energy is neither lost nor gained |
| Chemical properties | can be determined from an element's location in the periodic table |
| Metalloids | contain properties of both metals and nonmetals |
| Hydrocarbon | compounds that contain only the elements hydrogen and carbon |
| Organic compounds | Another name for carbon compounds |
