Types of Matter Monday
Objectives: Define element, compound, and mixtures. Define homogenous mixture and heterogeneous mixture. Classify examples of matter as element, compound, or mixture. Classify mixtures as homogenous or heterogeneous.
 Pure substance
 One kind of atom
 Represented by 1 or 2 letter symbol (the first letter will always be capitalized,
the second lower case)
 Examples: Helium ( He ), oxygen ( O
2
), copper (Cu)
 Categorized on the periodic table
 God created everything with 91 elements. Man has create more since.
 2 or more elements are chemically combined
 Represented by a chemical formula. The formula shows what elements are in the compound & how many atoms of each element are present.
 Examples: sodium chloride (NaCl), water (H
2
O).
 Combine in same proportion (example H
2
O vs. H
2
O
2
)
 Cannot be separated physically, must be separated by a chemical reaction.
 two or more substances physically combined
 Do not combined in some proportion
 Can be separated by physical means
 Heterogeneous mixture – not uniform (examples include: ocean, muddy water, air)
 Homogeneous mixture (aka solutions) - uniform (examples include: soda, salt water, brass, bronze)
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-
Cannot be separated physically
One kind of atom
2+ atoms chemically combined
-Can be separated by physically
2+ elements or compounds physically combined UNIFORMLY
2+ elements or compounds physically combined NOT
UNIFORMLY
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Homework Tuesday
______ 1. Read pages 26-35
______2. Vocabulary Quiz Wednesday: matter, pure substance, element, atom, compound, and molecule. Vocabulary quiz on Wednesday.
_____3. Continue to work on lab procedures.
Vocabulary Quiz Tuesday
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10.
Suspensions and Colloids Wednesday 9/17
Suspension:
 Mixture
 Particles will settle.
 Partlicles are large enough to block light.
 Examples: salad dressing, sand water, snow globe.
Colloid:
 Mixture
 Partles will not settle.
 Scatter light.
 Examples: Mixture in which particles will not settle.
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 Tyndall Effect: the scattering of light by colloids.
Notes:
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Homework Thursday 9/18
______ 1. Read pages 34-35
______ 2. Prepare for a quiz. Answer sample questions in printout. Study the “Composition of Matter” concept map, vocabulary, and class notes.
SAMPLE QUESTIONS: Label Each C, E, or M for Compound, Element, or Mixture. These are not the exact questions on the quiz. Study the composition of matter table and pages 26-35.
___M___1. Oil and water
____C__2. NaOH
____E__3. Nitrogen
____C__4. Carbon Dioxide
____E__5. Cl
2
____C__6. Carbon Dioxide
____E__7. Only one type of element
___M__8. Can be separated by physical means.
___M__9. Elements or molecules that are NOT chemically bond.
__E__10. Fe
__C__11. CO
__M__12. Combines in definite proportions
Answer Key
______1. Oil and water – mixture
______2. NaOH – compound
______3. Nitrogen - element
______4. Carbon Dioxide - compound
______5. Cl
2
- element
______6. Carbon Dioxide - compound
______7. Only one type of atom - element
_____8. Can be separated by physical means - mixture
_____9. Elements or molecules that are NOT chemically bond. - mixture
____10. Fe - element
____11. CO – compound
____12. Co - element
____12. Combines in definite proportions - mixture
*Remember, some elements are represented by one capital letter (like oxygen is O). Other are represented by one capital letter and one lower case letter (Like sodium is Na). So, if a formula only has one capital letter – it is an element. If it has more than one capital letter, it is a compound.
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Separations Lab CW Friday 9/19
Objectives: Distinguish between pure substances and mixtures ; Separate mixtures using various methods
Materials: Coffee filters, magnets, water, hot plate, sample consisting of
Styrofoam, sand, salt, iron fillings, and rocks.
Instruction: Separate Sample Contents!!!!! Yes, that is all I am going to tell you; put on your thinking hats. Plan first. If you do not have a good plan first, you may make a mistake that will make this lab very difficult. Separate Sample Contents!!!!!
Please write out your plan to separate each ingredient BEFORE beginning. These are
NOT in order.
Separate Styrofoam by:
_________________________________________________________________________
_________________________________________________________________________
Separate iron fillings by:
_________________________________________________________________________
_________________________________________________________________________
Separate rocks by:
_________________________________________________________________________
_________________________________________________________________________
Separate sand by:
_________________________________________________________________________
_________________________________________________________________________
Separate salt by:
_________________________________________________________________________
_________________________________________________________________________
NOW: List contents in order of separation:
_________________________________________________________________________
_________________________________________________________________________
YOU ARE NOW READY TO SEPARATE.
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Quiz questions:
Which of the following in NOT a symbol for an element? a.
Na b.
CO c.
S d.
He
A(n) _____________ is made of two or more elements chemically combined. a.
Element b.
Mixture c.
Compound d.
Alloy
Which of the following is an example of a compound? a.
Oxygen b.
Pizza c.
Sodium chloride d.
Helium
Which of the following is an example of a heterogeneous mixture? a.
Tea b.
Oxygen c.
Pizza d.
Water
Which of the following always combines in definite proportions? a.
Element b.
Compound c.
Heterogeneous mixture d.
Homogeneous mixture.
Classify each of the following as an element (E), compound (C), or mixture (M)
Chocolate chip cookie _____
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Oxygen gas _____
Salt water _____
Taco _____
Gold _____
Carbon dioxide _____
Water _____
Table salt _____
Muddy water _____
Potassium _____
Brass _____
Graphite _____
Glass _____
Air _____
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