1. Standard 2 LESSON 8 Chemical Reactions

2. Properties and Changes in Matter
Matter can be described in two kids of properties:
Physical properties
Chemical properties
Changes in matter can be described by:
Physical change
Chemical change

3. Fill in the blank
Matter can be described by ________________ & _______________ properties
Changes in matter can be described by ________________ & ____________ change

4. Properties of Matter
Physical property is a characteristic of a substance that can be observed without changing the substance into another substance.
Ex. Color , hardness, texture, shine, flexibility, temperature at which a solid melts
Ice melts at 32 degrees F.
The chemical properties do not change because water is the same substance frozen or liquid

5. Fill in the Blank
Examples of physical properties include ______________, ____________, and _______________
Color , hardness, texture, shine, flexibility, temperature at which a solid melts

6. Chemical Properties
Chemical properties is a characteristic of a substance that describes it’s ability to change into other substances.
To observe chemical properties you must watch a substance change into another substance
Ex. Burning and rusting
Magnesium burns  combines with Oxygen  forms magnesium oxide

7. Fill in the blank
Chemical properties is a trait of a substance that describes it’s ability to _______________________
_______________ & _______________ are examples of chemical properties
Change into other substances
Burning & rusting

8. Chemical Reaction
Chemical Reaction: change in matter that produces one or more new substances in a chemical change
Ex. Gas burns in car engine  new substances is cars exhaust
Chemical change occurs when bonds break and new ones form
Chemical Reaction examples:

9. Fill in the blank
A chemical Reaction is change in matter that produces ________________ in a chemical change.
Ex. Gas __________ in car engine  new substances is _______________
Chemical change occurs when ___________ break and new ones form
New substances, burns, car exhaust, bonds

10. Evidence for Chemical Reaction
Changes in properties
Color change
A solid may appear when two solutions mix
Gas may be produced (bubbles)
Heat/flame produced or absorbed
Changes in energy
Endothermic reaction: energy is absorbed
exothermic reaction: releases energy

11. Physical Change
A physical change is a type of change in which the form of matter is altered but one substance is not transformed into another.
The size or shape of matter may be changed
No chemical reaction occurs.
Physical changes are usually reversible.

12. Fill in the Blank
A physical change is a type of change in which the form of matter is ______________ but not _______________
The ____________ or ____________ of matter may be changed
No __________________ occurs.
Physical changes are usually __________________

13. Examples of Physical Change
Crumpling a sheet or paper
Breaking a pane of glass
Freezing water into ice 
Chopping vegetables
Dissolving sugar in water
(sugar mixes with water, but the molecules are not changed and may be recovered by boiling off the water)

14. Chemical Reactions Ticket to Leave
Physical or chemical
1. Baking bread
2. Peeling an orange
3. Rotting Eggs
4. Melting Ice
5. Burning Wood
6. Fireworks
7. Wood to sawdust
Chemical, 2. physical, 3. chemical, 4. physical, 5. Chemical, 6. chemical, 7. Physical