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8th Grade Chemistry
Terms from 8th grade chemistry
| Question | Answer |
|---|---|
| Atom | The basic building block of most ordinary matter. |
| Element | A substance made up of only one type of atom. |
| Nucleus | The center of an atom. |
| Proton | A positively charged subatomic particle. |
| Neutron | A subatomic particle that has no charge. |
| Electron | A negatively charged subatomic particle. |
| Electron Cloud | The area outside the atomic nucleus where electrons are located. |
| Energy Level | The part of the electron cloud where an electron is most likely to be found. |
| Atomic Number | The number of protons in the nucleus of an atom. |
| Neutral | Having no electrical charge. |
| Atomic Mass | The number of protons and neutrons in the nucleus of one atom of an element. |
| Chemical Symbol | A one-or two-letter code used to represent an element. |
| State of Matter | The physical form in which matter exists; solid, liquid, gas, or plasma. |
| Solid | A substance with definite shape and volume. |
| Liquids | A substance that has a definite volume but no definite shape. |
| Gas | A substance that has neither a definite shape nor a definite volume. |
| Plasma | A state of matter that consists of a mixture of electrons and positive ions. |
| Melting point | The temperature at which a liquid begins to change to a solid. |
| Vaporization | The process in which a liquid changes to a gas. |
| Boiling Point | The temperature at which a liquid begins to change to a gas. |
| Condensation | The process in which a gas turns into a liquid. |
| Freezing Point | The temperature at which a liquid begins to change into a solid. |
| Density | The mass of a substance per unit of volume. |
| Physical Property | A characteristic of matter that can be observed or measured without changing the identity of a substance. |
| Chemical Property | A characteristic that determines how a substance will interact with other substances during a chemical reaction. |
| Reactivity | How likely an atom is to react with atoms of other elements to form compounds. |
| Physical Change | A change that alters the physical properties of a substance without changing the identity of the substance. |
| Chemical Change | The changing of one substance into a new substance with different properties. |
| Chemical Reaction | The process by which new substances form during a chemical change. |
| Precipitate | A solid formed by a chemical reaction that takes place in solution. |
| Combustion Reaction | A chemical reaction in which oxygen combines with certain other substances and heat and light are given off. |
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kmk3n
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