Thursday, Jan. 5th: Physical and Chemical Changes

icg_physchemchangeposter

LEARNING TARGETS

  • What is the difference between a physical and chemical properties and changes?
  • What are some examples of each?
  • To identify each type of change in an activity and to explain why it is that type of change.

What is a PROPERTY?

What is a PHYSICAL PROPERTIES and CHANGES?

  • PHYSICAL PROPERTIES: Color, shape, mass/weight, volume (how much space something takes up, state of matter- solid, liquid gas, length.
  • PHYSICAL CHANGES
    • DEFINITION: There is a change in the physical properties but the material is STILL the same material.
    • MORE for UNDERSTANDING:
      • A new substance IS NOT created.
      • Material (matter) is the same before and after the change.
      • Physical changes can usually be undone: i.e. water can be frozen and melted.
    • EVIDENCE OF A PHYSICAL CHANGE (How do I know when a physical change has happened?
      • Some examples of physical changes: different shape, different color, different state of matter, different size.

What is a CHEMICAL CHANGE?

  • CHEMICAL PROPERTIESare characteristics of a material that become evident (show up) when the material undergoes a chemical reaction or chemical change. Some examples are how a substance might react with oxygen or water; how flammable it is (will start on fire); how toxic something is (how much damage it does to the organism and how quickly that damage occurs).
  • CHEMICAL CHANGES- Write all of this down:
    • Produce a new substance when substances react to each other.
    • A reaction happens and a new component is formed.
    • Substances present at the beginning of the change are NOT present at the end.
    • Cannot or are very difficult to undo!
    • EVIDENCE OF A CHEMICAL CHANGE: Different signs include odor, light, temperature change- it takes in or gives off heat,  a precipitate forms (formation of a solid when two liquids are combined), production of gas bubbles, and a color change.

WATCH

REVIEW

LET’S PLAY (Use Chrome)

LAB INFORMATION RESOURCES

  • Exploritorium: scroll down the page for information on how this works and other questions to ask.
  • Science Bob: has reaction information and things to test.
Advertisements
This entry was posted in Uncategorized. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s