Name______________________________________ Date______ Block____
Unit 3: Chemistry
Learning Target
I can identify chemical and
physical changes and
properties.
I can use data to determine
if a chemical reaction
occurred and describe the
change in properties.
I can label and identify parts
of a chemical equation.
I can construct and use a
model to explain the Law of
Conservation of Mass.
Activity
Self Check: Have
it…or still working on
it?
1. Examples of Chemical and Physical Properties
Chemical Property
Physical Property
Flammability
Density
Odor
Melting point
Reactivity
Boiling point
5. Circle the subscript and put a box around the coefficients
6. Label each part of the equation
2. Examples of Chemical and Physical Changes
Chemical Change
Physical Change
Burning
Boiling
Bubbling
Freezing
Odor produced
Dissolving
New substance formed
Breaking
3. Define Chemical and Physical Change
Chemical Change:
Happens when one or more substances are changed into new substances
that have new and different properties.
Physical Change:
any change NOT involving a change in the substance's chemical identity
Produces or yields
Reactants
Products
7. Balance the chemical equations
4. Using the chart below, determine which test caused a chemical
reaction. Explain how you know a chemical reaction took place.
Test
1
2
3
4
Substance A
White powder
Red powder
Substance B
Clear liquid
Clear liquid
White powder
Yellow liquid
Clear liquid
Clear liquid
Observation
Bubbling
Color change, no
odor produced
Odor produced
Precipitate formed
In Test 1, a chemical reaction took place because bubbling was observed.
Bubbling is a sign of a chemical change.
In Test 3, a chemical reaction took place because an odor was produced.
Production of an odor is a sign of a chemical change.
In Test 4, a chemical reaction took place because a precipitate was
formed. A new substance formed is a sign of a chemical change.
8. What is the Law of Conservation of Mass?
The law of conservation of mass is a law of science that states that
MATTER cannot be CREATED or DESTROYED only CHANGED in form.
9.
How does the Law of Conservation of Mass apply to chemical
reactions?
The mass of the reactants must be equal to the mass of the products.