Unit 2 TEK 6.6 A, 6.6B, 6.6C Review
TEK 6.6A- Metals, Nonmetals & Metalloids
Properties of Metals:
1.
2.
3.
4.
5.
Shiny (Luster)
Good conductor of electricity and thermal energy
Malleable (Hammered into sheets)
Ductile ( pulled into wires)
Mostly solid at room temp
Uses of metals:
1.
2.
3.
4.
5.
Jewelry
Vehicles
Thermometer
Coins
Technology
Properties of Nonmetals:
1.
2.
3.
4.
5.
No Luster
Poor conductor of electricity and thermal energy
Good Insulator
Brittle (NOT Malleable or Ductile)
Many are gases at room temp
Uses of Nonmetals:
1. Insulator
2. Nose cones on space shuttles
3. Diamonds, graphite(pencils)
Properties of Metalloids:
1. Has physical and chemical properties of both metals and nonmetals
2. Act as a semiconductor ( Good conductor at high temps)
Uses of metalloids:
1.
2.
3.
4.
Fireworks
Water softeners
Laundry products
Computer chips
TEK 6.6B- Density
Define the following:
Density- The mass per unit volume of a substance
Mass- The amount of matter in an object
Volume – The amount of space an object takes up
What are the units for density?
What is the formula for density? - mass ÷ volume
Practice Problems:
1. An irregularly shaped stone was lowered into a graduated cylinder holding a volume of
water equal to 2 ml. The height of the water rose to 7 ml. If the mass of the stone was
25 g, what was its density?
D=
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2. A piece of wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 216
grams. What is the density of the wood? (volume = L x W x H)
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D=
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3. What is the density of on object with a mass of 20g and a volume of 7mL?
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D=
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4. An irregularly shaped stone was lowered into a graduated cylinder holding a volume of water
equal to 20.0mL. The height of the water rose to 30.0 mL. If the mass of the stone was 60g, what
was its density?
D=
D=
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5. Calculate the density of a 600 g rectangular block with the following dimensions: length=8 cm,
width=5 cm, height=5 cm.
D=
D=
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TEK 6.6C- Minerals
Minerals are:
1. Naturally occurring
a. Formed in processes on or in the earth with no human input
2. Inorganic
a. Not made by living process
b. *It has never been alive!
3. Definite chemical composition
a. All minerals are elements or compounds with definite chemical composition
4. Crystal Structure
a. The atoms of the mineral are arranged in patterns that repeat over and over
again.
b. Ex. Graphite versus Diamond
The 5 physical properties we use to identify minerals are (be sure to explain each):
1. Color
 This is an easy clue, but it can be misleading.
 Many different minerals have the same color and appearance…
 ex) pyrite and gold
2. Hardness
 A measure of how easily a mineral can be scratched.
 Mohs Hardness Scale
3. Luster
 The way the mineral reflects light.
 Either metallic or non-metallic.
 Nonmetallic can be: Dull, Pearly, Silky, and Glassy
4. Streak
 The color of the mineral in the powdered form.
5. Cleavage and Fracture
 Cleavage – mineral that break along a smooth, flat surface (ex. Mica)
 Not all minerals have cleavage…
 Fracture – minerals that break with uneven, rough, or jagged surfaces (ex. Halite)
Answer the following questions using Moh’s hardness scale:
1. Which mineral could be scratched by a copper penny but not
by a fingernail?
Calcite
2. Which mineral can be scratched by Quartz but no by
Apatite?
Feldspar
3. Which minerals can be scratched by Topaz but not by
Flurite?
Quartz, Feldspar, and Apatite
Use the following chart to answer the questions below:
Observation of Unknown Substance
Unknown
Conducts Electricity
Luster
Malleability
1
2
3
No
Yes
No
Dull
Shiny
Shiny
Snaps easily into small pieces
Bends easily
Bends and snaps back to original shape
4
Yes
Dull
Shatters easily
1. Which of the unknown substances is most likely a metal? __2___
2. Which of the unknown substances is most likely a metalloid? ___3&4___
3. Which of the unknown substances is most likely a nonmetal? ___1___