Chemical and Physical Reactions p://www.bing.com/videos/search?q=Bill+Nye+Chemical + ctions+Full+Episode&Form=VQFRVP#view=detail&mid= 29A663E2BC750BEF4B6929A663E2BC750BEF4 ck on link – choose the Bill Nye 7F – simple chemical reactions t is 23 minutes long.
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Physical Properties: characteristics of matter that can be observed without changing it to another substance.
Examples: _________ (mass/volume) ________ (can pulled into wires)
__________ (how easy it breaks) __________ (how stretchy)
_____________ (lets light through)
(Phase change)
Density Ductility
Brittleness Elasticity
Transparency
Boiling / freezing points
Physical ChangesIn a physical change, the substances are not altered chemically. No new products are formed. Chemical bonds are not broken in a physical change.
• Evidence that a physical change has occurred might include:– Change in shape– Change in form– Change in size– Change in phase (This is
always a physical change!)
Physical changes are usually reversible
Physical change• What could you do to
these items to cause a physical change to occur?
Chemical Properties Characteristics of matter that describe its ability to change into a new substance
Examples: _________________________ (ability to burn) ___________________(the ability to react with oxygen, which causes apple slices to turn brown and iron to rust) _________________________________(reacts to form new substance)
flammability
Ability to rustOxidation
Reactivity with acid
A change in matter that results in one or more new substances. You change what it is.
Chemical in the original substance combines with another chemical to create a new substance
Chemical Changes
Evidence of Chemical Reactions or Change
https://www.youtube.com/watch?v=cZMkqagL8Ps (2:52) Evidence of a Chemical Reactions
Gas matter that has no definite volume or shape. Molecules of a gas are so loosely arranged and move so rapidly that they will fill their container.
Liquid matter that has definite volume but not shape. Since the molecules of a liquid are loosely packed and move with greater speed, a liquid can flow and spread.
Solid matter that has definite volume and shape. The molecules are packed together tightly and move slowly.
_____________ the change from solid to liquid. _____________ the change from liquid to solid. ______________ the change from liquid to gas. ______________ vaporization from the surface of a liquid. ______________ vaporization from within as well as from the
surface of a liquid. ________________ the change from gas to liquid. _________________ the change from solid to gas. _________________ the change from gas to solid.