20 terms

Unit 3: Chemical Reactions

Matter that has the same composition and properties throughout; contains only one element or molecule
Two or more atoms that are bonded together (can be 2 of the same element or 2 different elements)
Chemical Formula
Identifies the number of atoms of each element in a molecule
The small number following the symbol of an element that shows how many atoms of that element are in the molecule (no # means there is 1 atom)
Chemical Bond
An interaction between atoms where electrons are shared to form molecules
Matter which contains more than one substance
A mixture that forms when one substance dissolves another; solid, liquid, or gas that looks as if it could be one substance
Physical State
The condition in which matter may be found: solid, liquid, or gas
Physical Change
A change in matter that only affects the appearance of the substance
Chemical Change
A change in matter which results in a new and different substance being formed
A physical change in which a solid is mixed in with a liquid
Chemical Reaction
When atoms of at least two different substance rearrange to form new and different substances
Chemical Equation
Shows the formulas for the reactants and products in a chemical reaction
The number that comes before a chemical formula and shows how many molecules are involved in a reaction
Substances that are present before a chemical reaction occurs
Substances that are produced from a chemical reaction
The arrow symbol in a chemical equation
A chemical reaction that absorbs heat
A chemical reaction that gives off heat
A solid that is produced during a chemical reaction between two or more liquids

Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com.
Click to see the original works with their full license.