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Daily Science (pg. 14)

Daily Science (pg. 14). How many sig figs are in the following numbers: 8090 0.0086 300000000 0.000405060 1.9000 Put the following numbers into scientific notation: 0.00000607 1900 0.000345 30400000000. Density. Pg. 17. Density.

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Daily Science (pg. 14)

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  1. Daily Science (pg. 14) • How many sig figs are in the following numbers: • 8090 • 0.0086 • 300000000 • 0.000405060 • 1.9000 • Put the following numbers into scientific notation: • 0.00000607 • 1900 • 0.000345 • 30400000000

  2. Density Pg. 17

  3. Density Density is a ratio that compares the mass of an object to its volume. density= mass/volume d= m/v Units: g/cm3 or g/mL

  4. Calculating Density in a Lab Use water displacement method Record starting volume, place object in, record final volume Calculate mass

  5. Practice Problems Calculate the density of a rock that has a mass of 5.6 g if when placed in a graduated cylinder that started at 10 mL, rose to 13 mL. Find the mass of a metal block that has a density of 8.7 g/mL and a volume of 2.1 cm3 . Find the volume of a piece of aluminum wire that has a mass of 4 g and a density of 6.6 g/mL.

  6. Percent Error Percent error is the ratio of an error to an accepted value. Percent error= {(actual value-experimental value)/actual value} x 100

  7. PE practice problems You calculate the density of a piece of metal to be 3.4 g/mL. The actual density is 3.7 g/mL. Calculate the percent error.

  8. Your Turn (pg. 17) Calculate the density of a book that has a mass of 190 g and a volume of 67 cm3 Calculate the mass of a ball that has a density of 6.0 g/cm3 and a volume of 4.5 cm3 Calculate the volume of a bouncy ball that has a density of 3.4 g/mL and a mass of 15 g. If you are in the lab and you find the density of a metal to be 10.2 g/mL but the actual densityis 11.0 g/mL, calculate your percent error.

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