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Chem Vocab #3 Q1
Chem Vocab Ch 3 sec 1&2
| Term | Definition |
|---|---|
| states of matter | All matter that exists naturally on Earth can be classified as one of these physical forms. |
| solid | a form of matter that has its own definite shape and volume. |
| liquid | a form of matter that flows, has constant volume, and takes the shape of its container. |
| gas | a form of matter that not only flows to conform to the shape of its container but also fills the entire volume of its container, |
| plasma | superheated matter – so hot that the electrons are ripped away from the atoms forming an ionized gas. It comprises over 99% of the visible universe. |
| vapor | the gaseous state of a substance that is a solid or a liquid at room temperature. |
| physical property | a characteristic that can be observed or measured without changing the sample’s composition. They describe |
| chemical property | The ability of a substance to combine with or change into one or more other substances. |
| extensive property | properties that are dependent on the amount of substance present. Mass , length and volume are examples of these properties. |
| intensive property | Independent of the amount of substance present. An example would be the density of a substance (at constant temperature and pressure) is the same no matter how much substance is present. For instance, most of the spices can be identified by their scent. |
| physical change | A change such as this, which alters a substance without changing its composition. |
| phase change | a transition of matter from one state to another. |
| chemical change | A process that involves one or more substances changing into new substances. |
| law of conservation of mass | Mass is neither created nor destroyed during a chemical reaction—it is conserved. |
| hydrogen | The chemical element with the atomic number 1. The lightest element. It is colorless, odorless, non-toxic, and highly combustible. |
| helium | The chemical element with atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling and melting point are the lowest among all the elements. |
| lithium | The chemical element with the atomic number 3. It is a soft, silvery-white alkali metal. Under standard conditions, it is the lightest metal and the lightest solid element |
| beryllium | The chemical element with atomic number 4. It is a steel-gray, strong, lightweight and brittle alkaline earth metal. It is a divalent element that occurs naturally only in combination with other elements to form minerals. |
Created by:
Mr. Bryant
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