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Use appropriate metric prefixes to write the following measurements without use of exponents: (c) 9.5 x 10-4 m.

 

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Use appropriate metric prefixes to write the following measurements without use of exponents:  (b) 6.5 x 10-6 s.

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Use appropriate metric prefixes to write the following measurements without use of exponents: (a) 6.35 x 10- 2 L.
 

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A match is lit and held under a cold piece of metal. The following observations are made: (a) The match burns. (b) The metal gets warmer. (c) Water condenses on the metal. (d) Soot (carbon) is deposited on the metal. Which of these occurrences are due to physical changes, and which are due to chemical changes?
 

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Label each of the following as either a physical process or a chemical process: (e) exploding of nitroglyerin.
 

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Label each of the following as either a physical process or a chemical process:  (d) digesting a candy bar.
 

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Label each of the following as either a physical process or a chemical process: (c) pulverizing an aspirin.

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Label each of the following as either a physical process or a chemical process:  (b) melting of ice.
 

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Label each of the following as either a physical process or a chemical process: (a) corrosion of aluminum metal.
 

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Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (d) sand.
 

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Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (c) iodine crystals.
 

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Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (b) tomato juice.
 

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Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (a) air.
 

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Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (d) gasoline.
 

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Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous:  (c) magnesium.

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Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous:  (b) seawater.
 

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Classify each of the following as a pure substance or a mixture.If a mixture, indicate whether it is homogeneous or heterogeneous: (a) rice pudding.

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(a) How many significant figures should be reported for the volume of the metal bar shown below? [5ection 1.5]
 

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(b) An oven thermometer with a circular scale reading degrees Fahrenheit is shown. What temperature does the scale indicate? How many significant figures are in the measurement? [Section 1.5]
 

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(a) What is the length of the pencil in the following figure if the scale reads in centimeters? How many significant figures are there in this measurement?
 

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The following dartboards illustrate the types of errors often seen when one measurement is repeated several times. The bull's-eye represents the "true value," and the darts represent the experimental measurements. Which board best represents each of the following scenarios: (a) measurements both accurate and precise? [Section 1.5]

 

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(a) Three spheres of equal size are composed of aluminum (density = 2.70 g/cm 3), silver (density = 10.49 g/cm3), and nickel (density = 8.90 g/cm3). List the spheres from lightest to heaviest.

 

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Does the following diagram represent a chemical or physical change? How do you know? [Section 1.3]
 

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Which of the following figures represents (d) a mixture of an element and a compound? (More than one picture might fit each descríption.)
[Section 1.2]
 

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Which of the following figures represents (c) a pure compound? (More than one picture might fit each descríption.)
[Section 1.2]
 

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