Phases, Phase Changes,

Chemical and Physical Changes

Science Fifth Grade

Mr. Pate

Standards• S5P2. Students will explain the difference

between a physical change and a chemical change.

• a. Investigate physical changes by separating mixtures and manipulating (cutting, tearing, folding) paper to demonstrate examples of physical change.

• b. Recognize that the changes in state of water (water vapor/steam, liquid, ice) are due to temperature differences and are examples of physical change.

Standards• c. Investigate the properties of a

substance before, during, and after a chemical reaction to find evidence of change.

• S5P1. Students will verify that an object is the sum of its parts

Standards• a. Demonstrate that the mass of an object

is equal to the sum of its parts by manipulating and measuring different objects made of various parts.

• b. Investigate how common items have parts that are too small to be seen without magnification

Essential Questions• What is a chemical change?• What is a physical change?• How does an object equal the

sum of its parts?

Task• The students will use the liquid mixture in

the baggie to create a change in state. • The students will use a banana and break

it into parts to see if the sum of the parts equal the whole.

Circumstance• The students will work in teacher assigned

groups to perform the experiments. • They will use the lab sheets to record data

and answer questions.

GOAL• To discuss the states of matter and the

terms relative to changes in state• To distinguish between chemical and

physical changes

Phases of Matter• Solid • 1. Has a definite shape

• 2. Has a definite volume

Phases of Matter• Solid • 3. Particles are tightly

packed (can’t move or flow well)

• 4. Low energy

Phases of Matter• Solid • 5. May be crystals with

repeating patterns– Ex: salt

Phases of Matter• Solid • 6. Amorphous solids

lose shape/flow like slow moving liquids– Ex: candle wax, window

glass, tar

Phases of Matter• Liquid • 1. No definite shape-

takes the shape of the container

• 2. Has a definite volume

Phases of Matter• Solid • 3. Particles are packed

loosely and flow slowly• 4. Average energy

Phases of Matter• Liquid • 5. Varying viscosities=

resistance of a liquid to flow– Honey has a high viscosity

Phases of Matter• Gas • 1. No definite shape-

takes shape of container• 2. No definite volume

Phases of Matter• Gas • 3. Particles are spread

far apart- fill all spaces• 4. Contantly moving and

bumping into eachother• 5. High energy

Phases of Matter• Gas • 6. Particles can be

squeezed in closer– Bumping into eachother and

walls causes pressure

Phase Website• Phases of matter at the molecular level

Phase Summary Chart• Work with a partner to fill in the phase

summary chart

Phase Changes• Phase

Changes• Matter such as water can

change from phase to phase by adding or taking away heat energy

Phase Changes• Melting • Solid to liquid

• Must take in heat energy• M.P of water = 0 C or 32 F

Examples of Melting

Phase Changes• Freezing • Liquid to solid

• Must lose heat energy• F.P of water = 0 C or 32 F

Examples of Freezing

Phase Changes• Evaporati

on• Liquid to gas• Must gain heat energy• B.P of water = 100 C or

212 F

Examples of Evaporation

Phase Changes• Condensatio

n• Gas to liquid• Must lose heat energy

Examples of Condensation

Phase Changes• Sublimati

on• Solid skips to gas• Must gain a lot of heat

energy• Ex:

– Freezer Frost– Dry Ice– Cirrus Clouds

Phase Change Website• Click here to view a phase change

Phase Change Diagram

Assessment• Determine what phase change is the

opposite of evaporation. Explain

Assessment• What type of phase change is seen in

this picture? Explain what occurs during this phase change

Physical and Chemical Changes• Physical

Change• Change in the

appearance of a substance without changing its identity

• The atoms remain unchanged

Physical and Chemical Changes• Chemical

Change• A substance changes into

a new and different substance

• The atoms are altered• Often involves chemical

rx

Ice Cream Baggie Procedure:1. Get a 1 gallon bag from Mr. Pate2. Put two cups of ice into the bag.3. Put ½ cup of rock salt on the ice and mix.4. Place the liquid mixture baggie inside the gallon bag

and seal the gallon bag.5. Begin to gently shake and roll the bag in your hands.

Pass to another group member if your hands get too cold.

6. Make sure that you are mixing the baggie with the liquid thoroughly.

7. You will need to mix thoroughly for at least 15 minutes. Check the clock to make sure.

8. If you have questions, raise your hand and talk to Mr. Pate.

Banana Procedure:1. Using the balance and the gram stackers, find the mass

of the banana. To do this, find the mass of the paper plate (Measure 1). Next, place the banana on the plate and find a new measure (Measure 2).

2. Subtract measure 1 from measure 2 to find the mass of the banana.

3. Carefully peel the banana into its edible and inedible parts.

4. Place the edible part of the banana on the plate and find its mass(Measure 3).

5. Subtract Measure 1 from Measure 3 to find the mass of the edible part of the banana.

6. Place the inedible part of the banana on the plate and find the mass (Measure 4).

7. Subtract Measure 1 from Measure 4 to find the inedible mass.