TOPICTOPIC

PHYSICAL AND CHEMICAL PHYSICAL AND CHEMICAL CHANGESCHANGES

ObjectiveObjective

To differentiate between physical To differentiate between physical and chemical changesand chemical changes

YOU ARE BE ABLE TO:YOU ARE BE ABLE TO:

1.1. Explain differentiate between Explain differentiate between physical and chemical changesphysical and chemical changes

2.2. Mention examples of physical Mention examples of physical and chemical changesand chemical changes

Key WordsKey Words

1.1. Physical ChangePhysical Change

2.2. Chemical ChangeChemical Change

Physical ChangePhysical Change

What is a physical change?What is a physical change?

A physical change is a change in the A physical change is a change in the size, shape, state, or appearance of size, shape, state, or appearance of matter.matter.

Physical ChangePhysical Change

Physical changesPhysical changes occur when occur when matter changes its property but matter changes its property but not its chemical nature.not its chemical nature.

Physical property changes could Physical property changes could include a change in: texture, include a change in: texture, shape, size, color, odor, volume, shape, size, color, odor, volume, mass, weight, and densitymass, weight, and density..

Chemical ChangeChemical Change

A chemical change A chemical change occurs when fireworks occurs when fireworks are used. Fireworks are used. Fireworks are made of metals are made of metals such as magnesium such as magnesium and copper. These and copper. These change chemically as change chemically as they light up the sky. they light up the sky.

Metal rustingMetal rusting

What is a chemical change?What is a chemical change?

A chemical change causes matter to A chemical change causes matter to become a new kind of matter.become a new kind of matter.

Here are some examples of chemical Here are some examples of chemical changes:changes:

campfire

rusty car

You are now ready to playYou are now ready to play“Name That Change!”

physical

chemicalchemical

physicalphysical

physicalphysical

chemicalchemical

physicalphysical

NNoo

EventEvent PhysycaPhysycall

ChangesChanges

ChemicalChemical

ChangesChanges

11 Iron meltsIron melts

22 Break a bar of Break a bar of candlecandle

33 FreezingFreezing

44 BoilingBoiling

55 VaporizingVaporizing

66 SublimatingSublimating

77 CondensingCondensing

TABEL 1

NNoo

EventEvent PhysycaPhysycall

ChangeChangess

ChemicalChemical

ChangesChanges

88 Bicycle rustedBicycle rusted

99 Candles burnedCandles burned

1010 Eggs rottenEggs rotten

1111 Mixing pea and Mixing pea and carrotcarrot

1212 Lighting upa Lighting upa ciggaretteciggarette

1313 Breaking GlassBreaking Glass

1414 Burning PaperBurning Paper

1515 Melting IceMelting Ice

CONCLUSIONCONCLUSION

NNoo

Physical Physical ChangeChange

cchemihemicalcal Change Change

11 No, New No, New substance are substance are formedformed

New substance areNew substance are formformed ed