Daily Science August 29 Write the abbreviation for microliters.

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Presentation transcript:

Daily Science August 29 Write the abbreviation for microliters. How many decimeters are in 450 Hectometers You are baking using a recipe from the UK. It calls for 48 ounces of butter. How many pounds is that (16 oz= 1 lb; 1 lb=453.6 g)

Density Pg. 15

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

Calculating Density in a Lab Use water displacement method Record starting volume, place object in, record final volume Calculate mass Can also sometimes measure volume using a ruler

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 volume of a piece of aluminum wire that has a mass of 4 g and a density of 6.6 g/mL.

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

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.