Post on 26-Dec-2015
transcript
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.
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
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
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
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)
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!!!!!!