HOW DOES MATTER CHANGE?

Investigation

Chapter 13 Lesson 2

Pages E50-E51

Objectives

• Compare and contrast physical and chemical changes

• Recognize that a physical change does not involve a change in the type of matter undergoing change

• Recognize that the same amount of matter exists before and after a chemical change takes place

Why it matters. . .

• What happens when an ice cube melts?

• What happens to iron in the rain?

• Where does the matter in a piece of wood go when the wood is burned?

Why it matters. . .

• When you shape wood with a saw, you have only changed its physical properties

• If you burn the wood, it is a chemical change in properties

Physical Properties

• Measured or detected by the senses

• Include: State, Size, Odor, Color

Length, Mass, Volume

Chemical Properties

• Ability or tendency of a material to change its chemical makeup

• Atoms and molecules create a new arrangement and a new material with different properties from the original material is formed.

Breaking an egg?

Fireworks exploding?

Cutting paper?

Cooking an egg?

Boiling water?

Sharpening a pencil?

Inquiry Skill . . .

• COMPARE– When you compare, you determine

how two or more organisms, objects, or events are similar and how they are different.

SCIENCE INVESTIGATION                    Chapter_____Lesson______    Name/Names:__________________________    Date:__________________ 

1.What is the Question?  What is the Problem?

 

2.Hypothesis:

 

3.Materials:   

•Procedures:

 

•Data:

      6.  Conclusion/Results

COMPARE

YOU WILL BE COMPARING AND CONTRASTING THE

PROPERTIES OF MILK AND VINEGAR

Question or Problem?

• What happens when milk and vinegar mix?

HYPOTHESIZE

• Write your hypothesis on your investigation paper.

– What do you predict will happen when milk and vinegar mix?

Materials

• Goggles

• Two jars

• Skim Milk

• Vinegar

SAFETY!!!!!

Wear goggles during this investigation!!!

4. Procedures:

{WRITE: See attached sheet}

You will be given a copy of the procedures to staple to your paper.

COLLABORATE

• Work with your partner.• Create a chart large enough for you to

include written observations• You can create this chart on the back of

your investigation sheet• Example is on the next slide • On your investigation sheet under 5. Data

write: See back of paper

Data Chart to Create

MILK VINEGAR Combined

Milk &

Vinegar

Properties

Behavior after shaking

OBSERVE

• Pour 100mL of milk into one jar• Pour 100mL of vinegar into the

other jar• Study the properties of each liquid• Record your observations on your

chart

OBSERVE

• Tightly cover the jar of milk and shake vigorously

• Set the jar back on your table

• Observe how the milk returns along the sides to the bottom of the jar

• Record your observations

OBSERVE

• Tightly cover the jar of vinegar and shake vigorously

• Set the jar back on your table

• Observe how the milk returns along the sides of the bottom of the jar

• Record your observations

EXPERIMENT

• Uncover the jars and carefully pour a small amount of vinegar into the milk.

• Observe the interaction of the two liquids.

• Record your observations.

EXPERIMENT

• Pour the rest of the vinegar into the milk.

• Stir the mixture and allow it to settle.

• Record your observations.

EVALUATE RESULTS

• Discuss with your lab partner the chart you created.

• Compare and Contrast the milk and vinegar properties when separate and then when mixed.

• Record your conclusion of your hypothesis on your investigation sheet (#6)

EXPLAIN RESULTS

• At your group, discuss your results with each other.

QUESTION?

• What kind of change took place when milk and vinegar were combined?

• CHEMICAL CHANGE– The result was a new substance

WOW

• You are now an expert in Chemical and Physical Change.

• Well, if you are not sure don’t worry. As we read the next lesson you should have a lot more confidence!

• Way to go!!!!!!