Exothermic and Endothermic
This energy from this type of reaction is often released through heat.
Exothermic
When groups of atoms combine together, they are referred to as...
Molecules
One of the three types of subatomic particles. [Has a positive charge]
Protons
A new substance formed in a chemical reaction.
The three groups of elements on the periodic table.
Metals, metalloids, and nonmetals
A molecule that speeds up chemical reactions.
Catalyst
H2O is an example of a...
Chemical formula
All matter is composed of...
Atoms
A change in matter that does not result in a new substance.
Physical change
Horizontal rows on the periodic table
Periods
Photosynthesis is an example of this type of reaction.
Double replacement
This rule states that atoms bond in order to have a full valence shell of eight electrons.
Octet Rule
Nucleus
This law states that matter is never created nor destroyed.
The Law of Conservation of Mass
Electrons involved in chemical reactions.
Chemical reaction that uses more energy than it releases.
Endothermic Reactions
A chemical bond between sodium and chloride.
Ionic bond
This type of subatomic particle has no mass.
Electron
If a chemical change has happened, a ___ happened as well.
Chemical reaction
Activation Energy
Type of chemical bond in which electrons are being shared?
covalent bonds
How many electrons are in the outer shell of Calcium (Ca)?
2
A solid that forms but does not dissolve in a reaction mixture. [Can cause cloudy-ness]
Precipitate
Alkali metals