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12 Cards in this Set
- Front
- Back
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Chemical Change
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Tarnishing (Tarnished Silverware)
Rusting (Rusted Iron) Combustion (Burning leaves) Cooking (Baking a cake) |
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Physical Change
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Salt Water
Melted Ice Cream Crushed Can Broken Bottle |
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How is an element different from a compound?
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An element is a pure substance made of only one kind of atom that cannot be broken down.
Examples: Hydrogen, Oxygen, Helium, Gold, Silver A compound is a molecule made of at least two different types of elements that are chemically combined. |
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Characteristics of a Compound.
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Compounds are made of 2 or more different elements
Compounds are chemically combined and have a formula. Made of elements of a specific ratio. Compounds cannot be broken down easily. Can only be broken down chemically, not physically |
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What is a precipitate?
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A precipitate is the solid that is formed as a result of a chemical reaction.
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What are some examples of evidence of a chemical change?
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Light
Heat Color Change Gas Production Odor Sound Rusting Tarnishing Combustion (FIRE!) Precipitate |
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What is the formula for Density?
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Density = Mass/Volume
D = M/V Density = g/cm3 or g/mL |
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Explain how you know if an object will sink or float.
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The density of water is 1 g/mL
So… if the density of the object is greater than 1 it will sink. If the density is less than one it will float. Density > 1 g/mL = Sink Density < 1 g/mL = Float |
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A student measures the mass of a 8cm3 block of brown sugar to be 12.9 g. What is the density of the brown sugar?
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D = M/V
12.9g/8cm3 = 1.61 g/cm3 |
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An ice cube has a volume of
12 cm3 and a mass of 11g. What is the density of the ice? |
D = M/V
11g/12cm3 = 0.92 g/cm3 |
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A solid magnesium flare has a mass of 1300g and a volume of 743 cm3. What is the density of the magnesium?
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and a volume of 743 cm3. What is the density of the magnesium? D = M/V
1300g/743cm3 = 1.75 g/cm3 |
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Density is a physical property of matter that can be used to identify a pure substance. No matter the size of the sample, the density will be the same.
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Don't forget
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