instructional objective: 1.explain the properties of matter 2.identify elements and compounds....
TRANSCRIPT
Instructional Objective:1.Explain the properties of matter
2.Identify elements and compounds. 3.Compare and contrast solutions, colloids and
suspensions.4.Learn how to separate the substance.
Matter• Has mass
• Takes up space
Substance• Cannot be broken into a
smaller form• Definite composition
Mixture• A combo of two or moresubstances that can be
separated
Homogeneous• Two or more substances
blended evenly• Every part of the mixtureis identical to another part
Heterogeneous• Different substances can
be identified easily
Element• One type of element
• Found on periodic table• Oxygen, Carbon, etc…
Compound• Combination of two or
more elements• Water, table salt, etc…
What is a Pure Substance?
• Can be an element or a compound• Cannot be broken down into simpler
components• Always maintain the properties of the original
substance
Ex: helium,aluminum,water and salt
Elements
• substance that cannot be chemically broken down into simpler substances
• An element is made up of only one kind of atom.
• Are 90 elements found in nature.• More than 20 other elements have been
made in labs.• Some elements are unstable and exist only for
short time.
Elements
• Examples of Elements:
• Elements can be found onthe periodic table
Gold (Au)
Carbon (C)
Aluminum (Al)
Compounds
substance made up of two more elements that are chemically combined in a fixed ratio
The properties of a compound are different from the properties of the elements that make it up
Ex: Water is made of 2 hydrogen and 1 oxygen (both elements are gas)
Compounds
• Examples of Compounds:• Made up of more than
one element
Water (H2O)
Table Salt(NaCl)
Hydrogen PeroxideH2O2
SugarC12H22O11
Mixtures
• Two or more substances that can be separated by physical means
• Heterogeneous Mixture: A mixture that has different substances that can be distinguished easily
• Homogeneous Mixture: A mixture that has different substances blended together evenly.
Water (H2O)and
Acetic Acid (CH3CO2H)
1.Heterogeneous mixture (unevenly mixed )
Ex: salad, milk, blood etc…….
2.Homogeneous mixture (evenly mixed)Ex: any flat soft drink
Instructional Objective:1..Compare and contrast solutions, colloids and
suspensions.2.Learn how to separate the substance.
Colloids( come from a Greek word for glue)
A homogeneous mixtureIs a type of a mixture that never settlesParticles are larger than those solution but not heavy enough to settleEx: milk , gelatin, paint, fog, smoke etc…
How can you detect colloids?
• By it’s appearance.• By passing a beam of light through it• The particles are large enough to scatter
light• Ex: fog, shampoos, gelatins
Solutions, Colloids, and Suspensions Solution: Extremely small particles that will
not settle to the bottom of a container Colloid: A mixture that never settles but have
larger particles than a solution and whose particles never settle (fog, smoke)
Suspensions: A mixture that contains larger particles that will settle to the bottom with time (muddy water, orange juice)
What are physical and chemical changes?
–physical change: change that does not produce new substances
–chemical change: change that produces new substances
•
Instructional Objective:1.Identify the state of matter. 2Compare the heat of fusion and heat of vaporization
Physical Changes
• A physical change is a change in size, shape, or state of matter.
• In a physical change – the material you are changing is the same thing at the beginning and end of the change
Properties of Matter
Physical Properties-with out changing the appearance
Chemical Properties- always indicate a change
Physical Properties.
Identifying the content of a substances without changing it.
Can identify by their appearances.Ex: shape, color and state of matter. By their behaviorEx: melting point ,freezing point,
attraction of the particles etc……
Physical Properties. Viscosity (resistance to flow.) Conductivity (ability to allow heat or current
to flow) Malleability (ability to be hammered) Melting points (temperature at a substance
change from solid to liquid) Boiling points ( temperature at a substance
change from liquid to gas) Density (Use to identify a pure substances)
Date :1/25/11
Instructional Objective:1. Identify mixtures and learn how to separate them2.. Learn about chemical change and chemical properties
Review Questions:1.What is a compound ?
Other Instructions:Lab :work on Lab 8, Pg# 17Homework:Do the work sheet(Use your notes)
Chemical Change
A chemical change is a change that changes a material into something new
Burning paper (ash, smoke, fire) Sometimes you must rely on clues
Bubbles Heat produced Change in color Smoke
raw egg raw egg becomes becomes cooked cooked
eggegg
cake mix cake mix
becomes becomes cakecake
paper paper becomes becomes
ashash
steel steel becomes becomes
rustrust
What is a Chemical properties?
• Is a characteristic of a substance that indicates the chemical change
Ex: odor, color change,bubbling,foaming etc…..
Chemical Properties
• Flammability• Reactivity• Change of color• Odor • Production of Gas (bubbling)• Production of a precipitate (producing
solid matter)
Separate the substances using their Physical properties:
• Ex. Size(Size of a poppy seed and sunflower seeds.)
• Ex: color of the seed• Ex : attraction of the iron to the magnet
Separate the substance using their physical change
Distillation:
* is process for separating substance in a mixture by evaporating a liquid and recondensing it’s vapor.
Ex. Separate the salt from saltwater.
How can a suspension be separated?
• filtration: separation of particles in a suspension by passing through the filter paper or some other porous material
Separating substances using chemical change
• Ex: silver tarnish due to the reaction of silver with sulfur compound in the air forming sliver sulfide.
• Using chemical reaction sulfide can be removed to polish the sliver.
Conservation of Mass
In any type of change (physical or chemical), the combined mass of the material does not change◦This is called the “Law of Conservation of Mass”
◦Why do ashes have less mass that the wood that was burned?