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Science - Atoms, etc
| Question | Answer |
|---|---|
| Matter | Anything that has mass and takes up space. |
| Mass | The amount of matter in an object. |
| Volume | The amount of space an object occupies. |
| Density | Mass divided by volume. |
| States of Matter | The physical forms in which matter exists - solid, liquid, gas, and plasma. |
| Atom | The smallest unit of an element that retains the properties of that element. |
| Proton | A positively charged particle found in the nucleus of an atom. |
| Neutron | A particle with no charge found in the nucleus of an atom. |
| Electron | A negatively charged particle that orbits the nucleus. |
| Nucleus | The center of an atom, containing protons and neutrons. |
| Atomic Number | The number of protons in an atom's nucleus. |
| Molecule | Two or more atoms bonded together. |
| Compund | A substance made for two or more different elements chemically bonded. |
| Chemical Bond | The force that holds atoms together in a molecule or compound. |
| Chemical Formula | A representation of a compound using element symbols and numbers (e.g., H₂O). |
| Mixture | A combination of two or more substances that are not chemically bonded. |
| Homogeneous Mixture | A mixture that looks the same throughout (e.g., saltwater). |
| Heterogeneous Mixture | A mixture where you can see the different parts (e.g., salad). |
| Solution | A type of homogeneous mixture where one substance dissolves in another. |
| Solute | The substance that is dissolved. |
| Solvent | The substance that does the dissolving. |
| Element | A pure substance made of only one kind of atom. |
| Periodic Table | A chart that organizes all known elements by their properties. |
| Group (Family) | A column on the periodic table; elements in the same group have similar properties. |
| Period | A row on the periodic table; elements in the same period have the same number of energy levels. |
| Metals | Elements that are shiny, conduct electricity, and are malleable. |
| Nonmetals | Elements that are dull, poor conductors, and brittle. |
| Metalloids | Elements with properties of both metals and nonmetals. |
| Valence Electrons | Electrons in the outermost energy level of an atom; important in bonding. |
| Reactant | A substance that is present at the start of a chemical reaction and is changed during the reaction. |
| Product | A substance that is formed as a result of a chemical reaction. |
| Law of Conservation of Matter | Matter cannot be created or destroyed in a chemical reaction; the total mass of reactants equals the total mass of products. |
Created by:
Mickey Jackson
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