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Thurs Terms - Wk #6
| Question | Answer |
|---|---|
| Alkali Metals | Group 1 elements; most reactive METALS on the PT; Metals that only have 1 valence electron |
| Alkaline Earth Metals | Group 2 elements; MOST REACTIVE METALS on the PT; They that only have 2 valence electrons |
| Halogens | Group 17 elements; MOST REACTIVE NONMETALS on the PT; They that have 7 valence electrons |
| Noble Gases | Group 18 elements; UNREACTIVE NONMETALS on the PT; They have a full energy level with 8 valence electrons |
| Actinides | The bottom horizontal line of elements at the bottom of the periodic table that is separated from the rest, mostly synthetic (man-made) |
| Lanthanides | The top horizontal line of elements at the bottom of the periodic table that is separated from the rest, often are radioactive, including the elements Uranium and Plutonium, used for nuclear energy |
| Group/Family | one of 18 columns of elements on the PT; elements in the same group will react very similarly |
| Period | one of 7 rows of elements on the PT; elements in the same period will have the same number of energy levels |
| Valence Electron | electrons in the outermost energy level that form bonds with other elements, remember the magic number is 8 |
| Precipitate | the chemical reaction/formation of a solid when you mix a solution of two liquids |
| Open System | matter or energy can enter from or escape to the surroundings from the chemical reaction ex. campfire |
| Closed System | matter or energy is not allowed to enter or leave the chemical reaction ex chemical reaction in a ziplock bag |
| Catalyst | a chemical or substance that speeds up a chemical reaction ex. digestive enzymes link different molecules together so they can be broken down easier |
| Inhibitor | a chemical or substance that slows down a chemical reaction, ex. Water (water's high specific heat absorbs the energy instead of going into the chemical reaction) |
| Chemical equation | a way to represent a chemical reaction using element symbols and coefficients |
| Chemical formula | A set of chemical symbols and subscripts showing how many of each element present in a substance |
| Coefficient | changeable large numbers in front of each substance in a chemical equation; tells how many molecules of each substance the equation; Change the number to balance the equation |
| Subscript | permanent small numbers that are written below the line; tells how many atoms of a given type are in a compound |
| The arrow in an equation | Called a "Yield sign" means to produce or make in a chemical reaction |
| Law of Conservation of Mass | matter cannot be created or destroyed, just rearranged to form new substances |
| Product | the chemicals that are made in a chemical equation |
| Reactants | the starting materials for a chemical reaction |
Created by:
jhandy8
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