Notes
The student will:
Distinguish the difference between a chemical and a physical change
Investigate and understand physical changes in matter
Investigate and understand chemical changes in matter
Investigate and understand chemical formulas and the types of bonds found in simple compounds
The Law of Conservation of Mass/Matter Chemical Change Physical Change Chemical Formula Chemical Equation Reactant Product
States that mass/matter is neither lost or gained during a reaction, though it may change in substance, form, phase or state
When a substance changes its size or shape or phase/state of matter but still retains the properties of the original substance
i.e.:
▪ Paper being torn into little pieces
When a new substance is created through the combination of chemicals or energy
i.e.:
▪ Paper burning and turning into ash (carbon)
The way a substance or compound is expressed symbolically
▪ CO2 is Carbon Dioxide
▪ H2O is Water
▪ C6H12O6 is Glucose
A math-like equation that shows how chemicals are combined
C + O2 CO2
▪means “Yields”
The chemicals combined in a chemical equation Located on the left side of the
equation
Carbon (C) + 2 Oxygen atoms (O2)
▪2O+C CO2
The final outcome of a chemical reaction
Located on the right side of the equation, (right of the yields symbol )
C + O2CO2
▪Carbon (C ) + 2 Oxygen atoms (O2) = Carbon Dioxide (CO2)
Activity Chemical list Clues to Change
Notes (Cont.)
Simply mixing materials does not always produce a chemical change.
There must be evidence of a chemical change
▪Measurable
▪Observable
Same substance only in a different:
Shape
Size
Phase/State of Matter
▪ Solid
▪ Liquid
▪ Gas
A New substance must be formed!!!!!!!
One or more of these occurs
Color Change
Gas Formation (Bubbles/Fizzing)
Temperature Change (Increase/Decrease)
Precipitate Formation▪An insoluble compound forms at
the bottom