Upload
opal-hudson
View
217
Download
0
Tags:
Embed Size (px)
Citation preview
Physical Change
Physical change is a change that occurs that does not change the identity of the substance A change in which matter looks different but is still the same matter . A change that affects the size, shape or color of a substance but does not affect its composition
EXAMPLES OF PHYSICAL CHANGES
• Cutting paper• Mashing potatoes• Painting a wall• Breaking glass• Melting marshmallows• Molding clay• Water freezing• Water boiling• Thawing meat
A physical change alters the form of a substance, but does not change it to another substance.
Making Orange Juice
Chemical change is a change that occurs causing the identity of the substance to change. Examples include:
>Burning wood>Digesting food>Potassium reacting with water
A chemical change can also be called a chemical reaction.
Wood burning to ash and smoke (a
new substance is formed)
Iron rusting
Marshmallows burning
Apple rotting
Toasting bread
Examples of Chemical Changes
.
Example:
Baking a Cake
Indicators of a Chemical Change
Indicators of a chemical change can include:
Light is produced
Heat is either absorbed or produced
Gas is produced
There is a change in color
Formation of a precipitate
Differences between physical and chemical changes
With a physical change, the item can be change back to its original form
With a chemical change, the item cannot be changed back to its original form
IS IT A CHEMICAL OR A PHYSICAL CHANGE
Type of Change Physical Chemical
Melting ice
Burning wood
Souring milk
Wadding up paper
Rusting metal
Corn Starch and Water
Corn Plastic
Adapted from: www.dpi.state.nc.us/docs/curriculum/science/units/.../8unit2pt2.ppt
Thank you