- 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 PROPERTIES: are 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.
- Bozeman Science: Physical and Chemical Changes– http://www.bozemanscience.com/physical-chemical-changes/
- Physical vs Chemical Changes– https://www.youtube.com/watch?v=hcunQqbNEMQ
- Physical vs Chemical Changes with Mark and Molly– https://www.youtube.com/watch?v=M8tyjwB42X4
- Crash Course: Kitchen Chemical Changes– https://www.youtube.com/watch?v=37pir0ej_SE
- Physical and Chemical Changes for Kids– https://www.youtube.com/watch?v=BgM3e8YZxuc
- Chemical vs Physical Changes- https://www.learner.org/courses/essential/physicalsci/session4/closer1.html
- Chemical Reactions/Changes
- 10 Examples of Everyday Chemical Reactions- http://chemistry.about.com/od/chemicalreactions/ss/10-Examples-of-Chemical-Reactions-in-Everyday-Life.htm#showall
- Chemical Change Examples- http://www.buzzle.com/articles/chemical-change-examples.html
- Examples of Chemical Changes- http://www.chemistryforkids.net/reactions/what-is-a-chemical-change
- Physical Changes
- 10 Examples of Physical Changes- http://chemistry.about.com/od/matter/a/10-Physical-Change-Examples.htm
- Physical Change Examples- http://www.softschools.com/examples/science/physical_changes_examples/170/
LET’S PLAY (Use Chrome)
- Choose: Is it a physical or chemical change? http://vital.cs.ohiou.edu/steamwebsite/downloads/ChangeLab.swf
- Glencoe Physical and Chemical Change Virtual Lab- http://www.glencoe.com/sites/common_assets/science/virtual_labs/E03/E03.html
- Reversable (physical) and Irreversable (chemical) Changes, BBC- http://www.bbc.co.uk/schools/scienceclips/ages/10_11/rev_irrev_changes_fs.shtml
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.