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Matter & ItsMatter & Its

PropertiesProperties ChemicalProperties & Chemical

Changes

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Warm Up Question

The hospital cafeteria is ordering

hamburger for the year. If the portion

size is 125 grams and there are 225servings a day, how many kg should

be ordered for the year? How many

pounds should be ordered for a 10

year period?

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Answer to Warm UpQuestion

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Chemical Changes

A.K.A. Chemical Reactions

A process whereby one or more substances

interact in such a way as to be converted into anew one or ones.

Chemical properties of a substance may only

be determined from observing a chemical

change.

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Chemical Changes

The ability of a substance to undergo chemicalreactions and to form new substancesconstitutes its chemical properties.

For any single substance, chemical propertiesare unique & definitive.

A chemical change (or reaction) results in the

formation of new substance or substances withgenerally a different set or sets of physicalAND chemical properties.

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Factors affecting a substancesChemical Properties are ultimately

based on their Electron Structure /Reactivity.

Find your Brainy Smurf and brainstormchemical properties.

Chemical Properties

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Chemical Properties

Examples of Chemical Properties are: Electronegativity

Reactivity

Ionization Potential Flammability

pH

Toxicity

Oxidation state preference

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Chemical Change/Reaction

Evidence of a chemical change/reaction:

Please find your Radioactiveman and brainstormsigns or evidence of a chemical

change/reaction.

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Evidence of a Chemical Change/Reaction are: Formation of a gas or precipitate

Evolution or absorption of heat

Emission of light

Color change

Obvious change in physical properties of the original

substance

Rusting, rotting, decomposing, fermenting, corroding,growing, decaying, odors emitted, sprouting are all descriptors

indicating that a chemical change is taking place.

Chemical Change/Reaction

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Chemical Reactions

When one or more substances are changed into

new substances.

Reactants- stuff you start with

Products- What you make

NEW PROPERTIES

Often times not easily reversed

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Review of Properties

1) Chemical Properties:

characteristics that can

not be observed without

altering the identity of

the substance

2) Physical Properties:

Characteristics that

can be observedwithout altering the

identity of the

substance

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ChemicalProperties

Physical Properties

Density

Melting point

FlammabilityColor

Reactivity

Mass

SolubilityHardness

Boiling point

Temperature

Volume

Electron structure

Classify the following as chemical or physical properties

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Toffee Making!Toffee Making!A gooey and sticky introduction to

the process of candy making.

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Toffee Making Lab