5.1 Chemicals and Chemical Change.notebook

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5.1 Chemicals and Chemical Change

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Pure Substance­

Element­

Compound­

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Physical Properties are characteristics of a substance that

you can observe or measure WITHOUT changing the

composition of the substance.

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Malleable Ductile

ability of a solid to be hammered or bent into

shapes

ability to be pulled into a wire

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Viscosity Density

inability to flow mass per unit volume (m/v)

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Color Texture Taste

Size Shape Odor

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Boiling Point State changes from liquid to gas

Melting/Freezing Point State changes from solid to liquid

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Sep 12­8:01 PM

Chemical Property

A chemical property is a characteristic behavior that occurs when a substance changes into a new substance.

Sep 12­8:33 PM

Combustibility ability of a substance to burn in air

Sep 12­8:40 PM

Reaction with an Acid

How a substance behaves when exposed to an acid

Reaction of Copper with Nitric Acid Reaction of Sulfuric Acid and Sugar

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Reaction with Water substance reacts with water to form gas

Reaction of Magnesium Ribbon with Water

The reaction between calcium metal and water

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Physical Changes

A change which occurs when one or more physical properties of a substance is changed. It does not produce any new substance and usually is easily reversed. It is a change in the shape, size, or state of matter.

Typically can be identified using the five senses

Examples:

• Tearing

• Grinding

• Melting

• Dissolving

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Physical Vocabulary

Freezing ShreddingGrinding ErodingMelting DryingCombing CreasingShaved BreakingWrinkle EvaporatingCondensing

ch

baking soda + vinegar = carbon dioxide gas

Chemical Changes

A change which alters the chemical properties of a substance or which forms a new substance. The properties of the new substance are different than the properties of the starting substances.

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Chemical Changes

Clues that a chemical change has happened

5 Signs of a Chemical Change

• Bubbles of gas are produced• Heat or light is given off• A solid (precipitate) is formed in a liquid• A new color appears• The change is difficult to reverse

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Chemical Vocabulary

Burning RustingCooking DigestingExploding ReactingRotting MoldingIgniting PhotosynthesisOxidizing

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Classify the Changes Below as Physical or Chemical

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• Hazardous Material is a substance that requires special handling or storage because it can be dangerous or harmful to humans, animals or the environment.

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• The two types of hazardous material symbols are;1. Hazardous Household Product Symbols (HHPS)

2. Workplace Hazardous Materials Information System (WHMIS) Symbols

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