http://safeshare.tv/w/HRIRHUDXlJ

BURNING A CANDLE

• After melting, is the wax still

wax?

Yes, so Physical Change

• After burning, is the candle wick

still a candle wick?

No, so Chemical Change

MR. BEAN MEETS CHEMISTRY

• As you watch the

video of Mr. Bean,

what are some

indicators of a

chemical change

(chemical reaction

that you notice)?

SolidFixed VolumeFixed Shape

Least Kinetic Energy

LiquidFixed Volume

No fixed shapeModerate

Kinetic Energy

GasNo Fixed VolumeNo Fixed Shape

Most Kinetic Energy

Melting

BoilingEvaporating

Freezing Condensing

Sublimation

Deposition

Remember: States of matter changes are physical changes. The identify of the substance

stays the same.

Physical and Chemical Properties of Matter

Physical Properties/Changes Chemical Properties/Changes

Graphite — the layered structure of the carbon atoms gives graphite its physical properties.

The pattern of the atoms gives the

substance its physical properties.

Physical Properties

Physical Properties

Physical Changes– can be observed without changing the identity

of the substance( color, hardness, melting point & density)

– is only a change in any physical property of a substance

– matter can change from one state to another (liquid to a gas)

Some physical changes would be• boiling of a liquid• melting of a solid• dissolving a solid in a liquid • grinding or crushing• Condensation - when gas

becomes a liquid

Physical Properties and Changes Recap

• The characteristics of a substance that can be observed without changing the identity of the substance are called physical properties.▫ Examples:

Color Shape Texture Volume Mass Density

• A physical change is any change in any physical property of a substance, not in the substance itself.▫ Examples

Breaking a piece of clay Stretching a rubber band Melting ice into liquid water Dry Ice sublimating into gas

Chemical Properties and Chemical Changes

• Chemical properties of a substance are defined by the chemical changes it undergoes.

• Chemical changes transform the substance into a new identify.

• Chemical change or chemical reaction is the transformation of one or more atoms or molecules into one or more different molecules.

Chemical Properties and Changes

• Chemical properties describe how substances can form new substances.

• A chemical property is any of a material’s properties that becomes evident during a chemical reaction.▫ Examples:

Combustibility (ability to burn) Easily oxidized (ability to rust) Toxicity (level of harm to organisms) Reactivity with other chemicals Types of chemical bonds that will form

• The change of one substance into another substance is called a chemical change.▫ Examples:

The burning of wood The rusting of iron Mixing baking soda and vinegar to produce carbon dioxide

gas

Physical and Chemical Changes

Indicators of a

Chemical Change

• Color Change▫ Can be tricky to interpret▫ Some color changes are just a

mixture, not a chemical change Physical change – mixing food

coloring into water (mixture) Chemical change – iron

rusting due to oxygen (something new)

• Gas produced▫ Has to be a new substance, not

boiling!• Temperature change

▫ Gets hot – exothermic reaction▫ Gets cold – endothermic

reaction• Precipitate formed

▫ A solid is formed when reacting two or more fluids

• Odor change▫ A new smell!

• Light or sound production▫ Boom!

Physical vs. Chemical

• Examples:

– melting point

– flammable

– density

– magnetic

– tarnishes in air

physical

chemical

physical

physical

chemical

• Examples:

-rusting iron

-dissolving in water

-burning a log

-sublimation

-grinding spices

Chemical and Physical Change Practice Quiz #1

Chemical

Physical

Chemical

Physical

Physical

Practice Quiz #1; Practice Quiz #2

Physical vs. Chemical

COMPLETE CHEMISTRY PACKET USING ONLINE

TEXTBOOK

Mr. Ganey’s Webpage Science Booknotes (Textbook) Chemistry Textbooks

Matter and Energy Textbook Chapter 2

Extension:

Make vocabulary flash

cards from Chapter 1

Study Guide (#1-18)

and Chapter 2 Study

Guide (#1-10)