Term
|
Definition
| "anything that has mass and takes up space and is made up of different kinds of atoms; includes all things that can be seen, tasted, smelled, or touched but does not include heat, sound, or light" |
|
|
Term
|
Definition
| "a very small particle that makes up most kinds of matter and consists of smaller parts called protons, neutrons, and electrons" |
|
|
Term
|
Definition
| states that matter is not created or destroyed but only changes its form |
|
|
Term
|
Definition
| " invisible, negatively charged particle located in a cloudlike formation that surrounds the nucleus of an atom" |
|
|
Term
|
Definition
| "positively charged, central part of an atom" |
|
|
Term
|
Definition
| positively charged particle located in the nucleus of an atom and that is counted to identify the atomic number |
|
|
Term
|
Definition
| an uncharged particle located in the nucleus of an atom. Neutral or no charge. |
|
|
Term
|
Definition
| a spherical cloud of varying density surrounding the nucleus. The varying density shows where an electron is more or less likely to be. Atoms with electrons in higher energy levels have additional electron clouds of different shapes that also show where those electrons are likely to be |
|
|
Term
|
Definition
| Smaller parts of protons and neutrons. |
|
|
Term
|
Definition
| natural or synthetic material that cannot be broken down into simpler materials by ordinary means; has unique properties and is generally classified as a metal, metalloid, or nonmetal" |
|
|
Term
|
Definition
| number of protons in the nucleus of each atom of a given element; the top number in the periodic table. |
|
|
Term
|
Definition
| two or more atoms of the same element that have different numbers of neutrons in their nuclei. |
|
|
Term
|
Definition
| sum of the number of protons and neutrons in the nucleus of an atom |
|
|
Term
|
Definition
| "average mass of an atom of an element; its unit of measure is the atomic mass unit (u), which is 1/12 the mass of a carbon-12 atom" |
|
|
Term
|
Definition
| "element that is malleable, ductile, a good conductor of electricity, and generally has a shiny or metallic luster" |
|
|
Term
|
Definition
| elements that are usually gases or brittle solids and poor conductors of electricity and heat; are the basis of the chemicals of life |
|
|
Term
|
Definition
| element that has characteristics of both metals and nonmetals and is a solid at room temperature |
|
|
Term
|
Definition
| An atom that has lost or gained electrons and there has a charge |
|
|
Term
|
Definition
| matter that has the same composition and properties throughout |
|
|
Term
|
Definition
| a substance produced when elements combine and whose properties are different from each of the elements in it |
|
|
Term
|
Definition
| a combination of compounds and elements that has not formed a new substance and whose proportions can be changed without changing the mixture's identity |
|
|
Term
|
Definition
| The formula tells you which elements make up a compound as well as how many atoms of each element are present |
|
|
Term
|
Definition
| """the same throughout."" You can't see the different parts in this type of mixture. Homogeneous mixtures can be solids, liquids, or gases. " |
|
|
Term
|
Definition
| has larger parts that are different from each other. You can see the different parts of a heterogeneous mixture. |
|
|
Term
|
Definition
| "is a change in the form of the original substance. The matter is not changed chemically, just changed to another phase (i.e. gas, liquid, solid) or separated or combined" |
|
|
Term
|
Definition
| a change in the composition of the original substance. A chemical change is also called a chemical reaction. The matter is changed chemically and shows different physical and chemical properties after the change. |
|
|
Term
|
Definition
| properties of an element or compound in chemical reactions |
|
|
Term
|
Definition
| properties of an element or compound that can be observed without a chemical reaction of the matter |
|
|
