Physical or Chemical Changes
A block of ice is heated. The ice melts and forms water.
Physical Change
a change that occurs in matter in which no bonds are broken or formed, the substance is the same substance before and after the reaction
Physical Change
5 Signs of a Chemical Change
A solid when you mix to liquids
Precipitate
Na
Sodium
Iron is exposed to air and water. Rust forms.
Chemical
a positive electric charge
Proton
Two things must happen for a chemical change to occur
Bonds must be broken or formed
The chemical and physical properties of the reactants change
Substance that does The dissolving
Solvent
NaCl
Bromine has a red color.
Physical
the substances you mix together to make the reaction happen, found to the left of the arrow in an equation
Reactant
a change in matter that results from breaking bonds or forming new bonds
Chemical Change
Substance that is dissolved
Solute
CO2
Carbon Dioxide
Diamonds are capable of cutting glass.
Physical
the substances that are produced in a reaction, the substances that are made from the reaction, found to the right of the arrow in an equation
Products
Photosynthesis is a
Chemical Reaction
Draw the Bohr Model
Bohr Model
Two or more elements joined together chemically in a definite proportion
Compound Example H2O