notes gb lab 07 chemical detective a

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 ChangePhysical ChangeChemical FormulaChemical EquationReactantProduct

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)

▪C + O2 CO2

The final outcome of a chemical reaction

Located on the right side of the equation, (right of the yields symbol )

C + O2 CO2

▪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

CCoolloorr CChhaannggee

Gas Formation Gas Formation (Bubbles/Fizzing)(Bubbles/Fizzing)

Temperature Change Temperature Change (Increase/Decrease)(Increase/Decrease)

Precipitate FormationPrecipitate Formation▪An insoluble compound forms at the

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