Notes gb lab 07 chemical detective b
Transcript of Notes gb lab 07 chemical detective b
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Notes
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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
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The Law of Conservation of Mass/Matter Chemical Change Physical Change Chemical Formula Chemical Equation Reactant Product
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States that mass/matter is neither lost or gained during a reaction, though it may change in substance, form, phase or state
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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
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When a new substance is created through the combination of chemicals or energy
i.e.:
▪ Paper burning and turning into ash (carbon)
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The way a substance or compound is expressed symbolically
▪ CO2 is Carbon Dioxide
▪ H2O is Water
▪ C6H12O6 is Glucose
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A math-like equation that shows how chemicals are combined
C + O2 CO2
▪means “Yields”
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The chemicals combined in a chemical equation Located on the left side of the
equation
Carbon (C) + 2 Oxygen atoms (O2)
▪2O+C CO2
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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)
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Activity Chemical list Clues to Change
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Notes (Cont.)
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Simply mixing materials does not always produce a chemical change.
There must be evidence of a chemical change
▪Measurable
▪Observable
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Same substance only in a different:
Shape
Size
Phase/State of Matter
▪ Solid
▪ Liquid
▪ Gas
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A New substance must be formed!!!!!!!
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One or more of these occurs
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Color Change
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Gas Formation (Bubbles/Fizzing)
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Temperature Change (Increase/Decrease)
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Precipitate Formation▪An insoluble compound forms at
the bottom