Focus Activity: Look at the picture Focus Activity: Look at the picture below. List 4 observations and make below. List 4 observations and make

2 inferences.2 inferences.

Homework: Read section Homework: Read section 2.3 and answer questions 2.3 and answer questions

on page 55- left side of on page 55- left side of your notebook!!!your notebook!!!

Dress Appropriately for Dress Appropriately for the Lab on Wednesday!the Lab on Wednesday!

Physical Properties of Matter:Physical Properties of Matter: a characteristic of a substance that a characteristic of a substance that can be observed without changing it can be observed without changing it

into another substanceinto another substanceExamples:Examples: Physical State Physical State ColorColor TextureTexture HardnessHardness Freezing PointFreezing Point Boiling PointBoiling Point Malleability (Flexibility)Malleability (Flexibility)

Chemical Properties of Matter:Chemical Properties of Matter:a substance’s ability to change into a substance’s ability to change into

a different substancea different substance

Examples:Examples: FlammabilityFlammability Ability to react with Ability to react with

other substances other substances

Oxidation (e.g. rust)Oxidation (e.g. rust) pH LevelpH Level

Physical ChangesPhysical Changes

A A physical changephysical change is any change that alters the is any change that alters the form or appearance of matter but form or appearance of matter but does notdoes not change the substance.change the substance.

The substance is the same before AND after the The substance is the same before AND after the physical change.physical change.

Examples:Examples: Changes of state (melting, evaporating, Changes of state (melting, evaporating,

etc.)etc.) Changes in shape or form Changes in shape or form

(dissolving, bending, (dissolving, bending, crushing, breaking, crushing, breaking, chopping) chopping)

Forming a mixtureForming a mixture http://www.youtube.com/watch?v=BfmxnV

32v6I

Physical ChangePhysical Change

Is this matter changing into Is this matter changing into something new?something new?

How is it changing?

• chemical Changechemical ChangeProduces one or more new substances Produces one or more new substances

through a chemical reaction.through a chemical reaction. Creates a new substance with Creates a new substance with

properties that are different from the properties that are different from the original substance properties.original substance properties.

chemical Changechemical Change

Examples: Combustion (burning) Oxidation (rusting) Any chemical reaction Cooking food

http://www.youtube.com/watch?v=FZq91OnJJW8&feature=related

CHEMICAL CHANGE

Evidence of Chemical ChangesEvidence of Chemical ChangesIf there is a chemical change you If there is a chemical change you might see….might see….

BubblesBubbles

Substance may turn Substance may turn cloudycloudy

Temperature changesTemperature changes

Color changesColor changes

Change in smell or tasteChange in smell or taste

Law of Conservation of Mass Law of Conservation of Mass (Matter) (Matter)

Matter is neither created nor destroyed Matter is neither created nor destroyed during any during any physical or chemical changephysical or chemical change..

• The total amount of matter in a chemical The total amount of matter in a chemical reaction always reaction always remains the sameremains the same..

Molecules can help explain the law of Molecules can help explain the law of conservation of matter. For every molecule of conservation of matter. For every molecule of methane that burns, two molecules of oxygen methane that burns, two molecules of oxygen

are used. The atoms are rearranged in the are used. The atoms are rearranged in the reaction, but they do not disappear.reaction, but they do not disappear.

Thermal EnergyThermal EnergyEnergy – the ability to do work or cause Energy – the ability to do work or cause change.change.

Every physical and chemical change Every physical and chemical change includes a change in energy.includes a change in energy.

Slicing bread, folding paper, cutting Slicing bread, folding paper, cutting toenails, boiling water, all requires energy!toenails, boiling water, all requires energy!

Thermal EnergyThermal Energy

TemperatureTemperature is a measure of the average is a measure of the average energy of the particles matter.energy of the particles matter.

Thermal energy Thermal energy or or heatheat is the total energy is the total energy of all the particles in an object.of all the particles in an object.

Endothermic ChangeEndothermic Change – –

A change in which energy is absorbed A change in which energy is absorbed (taken in).(taken in).

Heat is Heat is absorbed absorbed by a substance.by a substance.

Examples: Examples: snowman meltingsnowman melting water evaporatingwater evaporating

Thermal Energy and Changes in Matter

Thermal Energy Thermal Energy and Changes in Matterand Changes in Matter

Exothermic ChangeExothermic Change – –

A change in which energy is releasedA change in which energy is released

Heat is Heat is releasedreleased by a substance. by a substance.Examples: Examples:

water freezing or condensingwater freezing or condensing burning paper or woodburning paper or wood hand warmers (for winter)hand warmers (for winter)

For your musical enjoyment…For your musical enjoyment…http://www.youtube.com/watch?v=5yjEDihEuZI&feature=related

Gummy Bears….Gummy Bears….With your partner get a cup and 1 gummy With your partner get a cup and 1 gummy bear.bear.

Write your names on the cup.Write your names on the cup.

Fill the cup about half way with water.Fill the cup about half way with water.

Put the gummy bear in.Put the gummy bear in.

We will check it tomorrow.We will check it tomorrow.

On the LEFT side, make a prediction about On the LEFT side, make a prediction about what you think will happen to your gummy what you think will happen to your gummy bear.bear.

http://www.youtube.com/watch?v=5yjEDihEuZI&feature=related