Physical and Chemical Physical and Chemical Properties and ChangesProperties and Changes

Physical PropertiesPhysical Properties

Characteristics of a material Characteristics of a material that you can observe without that you can observe without changing the substances that changing the substances that make up the materialmake up the material

A PHYSICAL DESCRIPTIONA PHYSICAL DESCRIPTION

ExampleExample What are the physical properties of a What are the physical properties of a

pumpkin? (Physically Describe the Pumpkin)pumpkin? (Physically Describe the Pumpkin)

Color – OrangeColor – Orange Shape – RoundShape – Round Odor – Smell itOdor – Smell it Taste – YumTaste – Yum Texture - TouchTexture - Touch Mass – Weigh itMass – Weigh it Dimensions – Measure itDimensions – Measure it Density – Mass/VolumeDensity – Mass/Volume

Let’s Ponder!!!!Let’s Ponder!!!! If a physical property is a physical If a physical property is a physical

description of an object, what is a physical description of an object, what is a physical change change

Physical ChangePhysical Change

A change in the: 1. SIZE A change in the: 1. SIZE 2. SHAPE 2. SHAPE 3. STATE OF MATTER3. STATE OF MATTER

Although the physical characteristics of the Although the physical characteristics of the substance have changed, chemically it is still the substance have changed, chemically it is still the same substancesame substance

ExampleExampleHH22OO

SolidLiquid

Gas

It is all still H2O

Example:Example:Paper DemonstrationPaper Demonstration

Salt Water DemonstrationSalt Water Demonstration

Chemical PropertiesChemical PropertiesA characteristic of a substance that A characteristic of a substance that

indicates whether it can undergo a specific indicates whether it can undergo a specific chemical changechemical change

In English Please!!!!In English Please!!!!Properties that can alter or change matter Properties that can alter or change matter

into something differentinto something differentExamples: 1. FlammabilityExamples: 1. Flammability 2. Explosive2. Explosive

3. Light Sensitive 3. Light Sensitive

Chemical ChangeChemical ChangeA change of one substance in a A change of one substance in a

material to a different substance or the material to a different substance or the creation of an additional substancecreation of an additional substance

Example:Example:

Nail + WaterNail + Water

Nail is made of iron (physical property)Nail is made of iron (physical property) Iron when exposed to water and oxygen Iron when exposed to water and oxygen

oxidizes (chemical property)oxidizes (chemical property)This means it rusts!!!!This means it rusts!!!!

Your nail is now iron oxideYour nail is now iron oxide

DemonstrationDemonstrationVinegar and Baking SodaVinegar and Baking Soda

Exploding BalloonExploding Balloon

Evidence of Chemical ChangesEvidence of Chemical ChangesFire/BurningFire/BurningBubbling/Gas productionBubbling/Gas productionTemperature Change without Temperature Change without

heating/coolingheating/coolingChange in ColorChange in ColorChange in OdorChange in OdorForms a precipitateForms a precipitate

ConclusionConclusionMatter can undergo physical and/or Matter can undergo physical and/or

chemical changeschemical changesPhysical Changes alter the physical make up Physical Changes alter the physical make up

of the matterof the matterChemical Change changes or creates a new Chemical Change changes or creates a new

substancesubstancePhysical Property – Physical descriptionPhysical Property – Physical descriptionChemical Property – Properties that Chemical Property – Properties that

determine how a substance behavesdetermine how a substance behaves