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Chapter 3: Matter - Properties and Changes

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Sydney Sturgeon

on 11 October 2016

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Transcript of Chapter 3: Matter - Properties and Changes

Chapter 3: Matter - Properties and Changes
Paper Burning
Chemical change or physical change?

Remember I want for each example:
1) TITLE
2) YOUR OBSERVATIONS
3) TYPE OF CHANGE AND WHY
Substances
Matter that has a uniform and unchanging composition.

Pure substances are the same everywhere.

Examples of pure substances include: pure water, table salt, any element
States of Matter
Substances or matter can be present in 3 different states or physical forms.

These states include:
(1) Solid
(2) Liquid
(3) Gas

And an additional (4) Plasma
Time to be real scientists! Take out a sheet of paper.
The following are examples of chemical changes and physical changes.

For each example I want you to write the:
1) TITLE
2) YOUR OBSERVATIONS - include any of the 4 indicators of a chemical change you notice.
3) TYPE OF CHANGE - whether you think it is a chemical change or a physical change and WHY you made your choice. Pay attention if the example shows one or more of the indicators of a chemical change.
Chemical change or physical change?

Remember I want for each example:
1) TITLE
2) YOUR OBSERVATIONS
3) TYPE OF CHANGE AND WHY
Banana Ripening
Chemical change or physical change?

Remember I want for each example:
1) TITLE
2) YOUR OBSERVATIONS
3) TYPE OF CHANGE AND WHY
Water Boiling
Chemical change or physical change?

Remember I want for each example:
1) TITLE
2) YOUR OBSERVATIONS
3) TYPE OF CHANGE AND WHY
Chemical change or physical change?

Remember I want for each example:
1) TITLE
2) YOUR OBSERVATIONS
3) TYPE OF CHANGE AND WHY
Glass Breaking
Briggs-Rauscher Reaction
Chemical change or physical change?

Remember I want for each example:
1) TITLE
2) YOUR OBSERVATIONS
3) TYPE OF CHANGE AND WHY
Potassium Chlorate and Gummy Bear
SOLID
LIQUID
GAS
PHYSICAL PROPERTIES:
Properties that are observed without changing the chemical identity of a substance.


Broken down into:
(1) Extensive Properties:
Depends on the sample size
(2) Intensive Properties:
Independent of sample size
CHEMICAL PROPERTIES:
Properties observed when a substance takes part in a chemical reaction and changes composition.
Let's Review with Iodine:
For each of the following properties stand up if you think it is a physical property or remain sitting if you think it is a chemical property.
PHYSICAL CHANGE:
When a substance is altered and undergoes a significant change, but its composition stays the same.

Includes changes in state (a.k.a. a phase change). Transition of matter from one state to another.
Phase Change Definitions
(1) Melting Point (MP): temp. at which a substance changes from a solid to a liquid

(2) Boiling Point (BP): temp. at which a substance changes from a liquid to a vapor (gas)
gas
- gas at room temp.; state of matter
vapor
- liquid or solid at room temp.; NOT a state of matter
The terms
gas
and
vapor
can NOT be used interchangeably

(3) Freezing Point: temp. at which a substance changes from a liquid to a solid
Heating Curve for Water
CHEMICAL CHANGE:
Process that involves one or more substances reacting and changing into new substances.

How can we tell if a chemical change has occurred?
4 Indicators of a Chemical Change:
(1) Change in color
(2) Change in energy (temp. change or light is emitted)
(3) Change in odor
(4) A gas (bubbling) or solid (precipitate) has formed
LAW OF CONSERVATION OF MASS
States that mass is neither created nor destroyed during a chemical reaction.

Mass of the reactants equals the mass of the products.
ONLINE STOPWATCH
http://www.online-stopwatch.com/
PHASE CHANGE TRIANGLE
Oct. 10 & 11
Law of Conservation of Mass
Do homework problem on whiteboard
Indefinite shape; indefinite volume
Indefinite shape; definite volume
Definite shape; definite volume
Full transcript