Term
|
Definition
| anything that occupies space and has mass |
|
|
Term
|
Definition
| a pure substance that cannot be broken down into other substances by chemical means |
|
|
Term
|
Definition
| elements that make up less than 0.01% of your body's mass, but nonetheless critical to your health |
|
|
Term
|
Definition
| a substance containing two or more elements that are chemically combined in a fixed ratio |
|
|
Term
|
Definition
from Greek atomos, meaning invisible
The smallest possible particle of an element |
|
|
Term
|
Definition
| a sub-atomic particle with a single unit of positive electrical charge |
|
|
Term
|
Definition
| a sub-atomic particle with a single unit of negative electric charge |
|
|
Term
|
Definition
|
|
Term
|
Definition
| an atom's protons and neutrons are tightly packed together forming a central core |
|
|
Term
|
Definition
| has the same number of protons, but a different number of neutrons |
|
|
Term
|
Definition
| one in which the nucleus decays, breaks down over time giving off radiation in the form of matter and energy |
|
|
Term
|
Definition
| all atoms of a particular element have the same number of protons as the element's atomic number |
|
|
Term
|
Definition
| occurs when an atom transfers an electron to another atom |
|
|
Term
|
Definition
| atoms or groups of atoms that have become electrically charged as a result of gaining or losing electrons |
|
|
Term
|
Definition
| chemical bond that forms when two atoms share electrons |
|
|
Term
|
Definition
| two or more atoms held together by covalent bonds |
|
|
Term
|
Definition
| breaking of old and formation of new chemical bonds that result in new substances |
|
|
Term
|
Definition
| starting material for a chemical reaction |
|
|
Term
|
Definition
| material created as a result of a chemical reaction |
|
|
Term
|
Definition
| molecule in which opposite ends have opposite electric charges |
|
|
Term
|
Definition
| bond created by the weak attraction of a slightly positive hydrogen atom to a slightly negative portion of another molecule |
|
|
Term
|
Definition
| tendency of molecules of the same kind to stick to one another |
|
|
Term
|
Definition
| attraction between unlike molecules |
|
|
Term
|
Definition
| total amount of energy associated with the random movement of atoms and molecules in a sample of matter |
|
|
Term
|
Definition
| measure of the average energy of random motion of particles in a substance |
|
|
Term
|
Definition
two substences or more were one is dissolved complestly in the other
EX: salt water |
|
|
Term
|
Definition
| solution in which water is the solvent |
|
|
Term
|
Definition
| compound that donates H+ ions to an aqueous solution and measures less than 7 on the pH scale |
|
|
Term
|
Definition
| compound that removes H+ ions from an aqueous solution and that measures more than 7 on the pH scale |
|
|
Term
|
Definition
| a range of numbers used to describe how acidic or basic a solution is; ranges from 0 (most acidic) to 14 |
|
|
Term
|
Definition
| substance that maintains a fairly constant pH in a solution by accepting H+ ions when their levels rise and donating H+ ions when their levels fall |
|
|
Term
| Describe the structure of a water molecule |
|
Definition
|
|
