Physical and Chemical Changes Unit Study Guide
Name____KEY______
SC-06-1.1.1 Students will explain how or why mixtures can be separated using physical properties.
A mixture of substances often can be separated into the original substances by using one or more of its characteristic
physical properties.
SC-06-1.1.2 Students will identify and describe evidence of chemical and physical changes in matter.
In chemical reactions, the total mass is conserved.
Substances are often classified into groups if they react in similar ways.
The patterns that allow classification can be used to infer or understand real life applications
for those substances.
I Can Statements
Meaning
Examples/Diagrams
A _mixture_ is matter made up of two or more pure
substances.
I can explain
how/why mixtures
can be separated
through the
identification of
physical
properties.
I can describe
evidence of
physical and
chemical changes
in matter.
Two types: __homogeneous___
___heterogeneous___
Exs: A tossed salad is a _heterogeneous__ mixture.
Lemonade is a __homogeneous___ mixture.
Five methods of separating of mixtures and examples:
1- evaporation -salt & water
2- sifting
-seashells & sand
3- magnets
-iron filings & sawdust
4- floatation
-oil & water
5- filtration
-coffee grounds & water
sorting
-bag of skittles
_Solutions__ are mixtures in which the parts are evenly
distributed throughout the mixture. Example
kool aid, sugar water, lemonade
A __physical__ property is any characteristic of matter that can
be observed or measured without changing the matter.
Examples (refer to p84)
color, shape, length, mass, density, volume,
state of matter, ability to attract magnet,
melting/boiling point, malleability, ductility
A __chemical__ property is any characteristic that allows a
substance (matter) to undergo a change that results in a new
substance(matter).
Examples (refer to p84)
flammability, reacts with: oxygen, water,
vinegar, etc
reacts in presence of: light, heat,
electricity, etc
Examples of Changes in Matter
Physical
Chemical
boiling/melting/
freezing
cooking food
A __chemical___ change is a change in matter that changes the
identity of a substance and forms a new substance.
Evidence of this type of change:
1 – gas forms (bubbles)
odor produced
2 – new substance
heat/cool w/no source
3 – color change(w/another clue) light produced
A __physical__ change is a change in which the properties of
matter change but the identity of the matter does not.
The __Law of Conservation of Mass___ states that the mass of
the products of a chemical change is always the same as the
mass of what you started with. (Refer to pg 85)
tearing paper
slicing tomato
make playdoh snake
burning something
digestion/respiration
photosynthesis
glow sticks
hot hands
*Sketch Campfire Example When flammable
materials burn, they combine with oxygen. Ash,
smoke, & gas produced. Smoke & gas escape to
air. If could measure that mass w/ash from
wood -would be same as original firewood.