1. Physical or Chemical? Changes and Properties

2. What is Chemistry?
The study of the composition of matter and the changes that matter undergoes.

3. What is Matter? Anything that has mass and volume (space it occupies)
All objects are made of matter
It can be something that you can’t see.
Examples:
Air
Water
You!

4. States of matter
There are three states of matter
1. Solid
2. Liquid
3. Gas

5. SOLID Has a definite shape and volume
Shape of solid does not depend on shape of container
Arrangement of particles: tightly packed together

6. Has an indefinite shape, flows, yet has a fixed volume.
LIQUID
Has an indefinite shape, flows, yet has a fixed volume.
Particles are close together but able to flow
Takes the shape of container

7. Gas Takes both the shape and volume of its container
Gas can expand to fill any volume (unlike a liquid)
Particles within a gas are far apart

8. States of Matter ( ( ) ) moving; close together moving quickly;
SOLID
LIQUID
GAS
( ( ) )
moving;
close together
moving quickly;
far apart
vibrating

10. Phase (State) of matter
Think-Pair-Share: Complete the state of matter summary chart in your notes.
Phase (State) of matter
Shape
Volume
Spacing of Particles
Movement of Particles
Solid
Liquid
Gas
Abbreviation
(s)
(l)
(g)

11. Solid Liquid Gas PHASES OF MATTER Phase (State) of matter Shape Volume
Spacing of Particles
Movement of Particles
Solid
Liquid
Gas
Abbreviation
Fixed position; very close
(s)
Definite
Definite
Vibrating
Moving: close together
Close but in a random arrangement
(l)
Indefinite
Definite
Moving quickly; far apart
Spread far apart from each other
(g)
Indefinite
Indefinite

12. Physical vs. Chemical Properties
Physical Property
Chemical Property
A characteristic that can be observed for a substance only during a change in the identity of the substance; ability of a substance to undergo a chemical change
Ex: ability to rust, ability to burn, flammability, reactivity
A characteristic that can be observed or measured for a substance without a change in the identity of the substance (chemical composition does not change).
Ex: color, state of matter, boiling point, melting point, density, solubility

13. Physical Properties Density Melting point Electrical conductivity
Solubility
Adsorption to a surface
Hardness
Size
Mass/volume
Shape
Melting point
Boiling point
Color
State of matter
Odor
Taste
Texture
Physical changes are characterized by the following:

14. Chemical Properties
Flammability
Explosiveness
Reactivity with acid
Corrosiveness
Ability to Burn
Ability to Rot
Ability to Rust
Ability to Decompose
Physical changes are characterized by the following:
**These properties are observed as the chemical make-up of the substance is changing**

15. Demo: physical or chemical change?
RECORD OBSERVATIONS
IS IT CHEMICAL OR PHYSICAL CHANGE? Why?
DEMO #2:

16. Physical vs. Chemical Changes
Physical Change
Chemical Change (reaction)
A change in which
only the physical state or condition of a substance is involved.
the particles (atoms or molecules) of a substance retain their identity.
Chemical composition does not change
No new products are formed
Ex: dissolving, grinding, melting
A change in which
A new substance results (with new physical and chemical properties).
the particles (atoms or molecules) of a substance become particles of a different substance
Chemical composition does change
Ex: burning wood, rusting

17. Physical changes All changes of state: Melting Freezing
Solid becoming a liquid
Freezing
Liquid becoming a solid
Boiling/Evaporation
Liquid becoming a gas
Condensation
Gas becoming a liquid
Deposition/Solidification
Gas becoming a solid
Sublimation
Solid becoming a gas

18. Changes of State Concept Map
Remember these
are physical changes!
Deposition

19. Physical Changes Freezing Milk Dissolving sugar Breaking a Vase
Coloring water red
Boiling Water
Ice melting
Melting Wax
Breaking a glass
Mixing sand and gravel
Cutting of Hair
Do demo showing mixture of food coloring

20. Chemical Changes Cooking Heating Sugar Leaves changing colors Rusting
Burning
With leaves changing colors, note back to physical change demo (how are they different)? Need something rusted

21. Signs of Chemical Changes
Gas Produced
2. Precipitate Formed
3. Color Change
4. Temperature Change
5. Bright Light Formed
Chemical Changes are characterized by the following:

22. Physical vs chemical changes video

23. Partner practice Identify & Explain why Chemical change
Physical change

24. Part 1: molecular modelsB) C)

25. D) E) F)

26. Part 2: Statements Two elements react to produce a compound
ice (H2O) melting
Cl2 + H2  2 HCl
a solid compound dissolving in water (H2O)
Hydrogen peroxide decomposing

27. Ability to do something or -ity word Just describes how it looks/acts
How do we know the difference between physical and chemical Changes and Properties?????
Is it an Action Word????
(-ing word)
Is it a Description????
Property
Change
Ability to do something or
-ity word
Just describes how it looks/acts
New Substance Made
Just Looks Different
Physical Property
Chemical Change
Physical Change
Chemical Property