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Presentation transcript:

20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt Those annoying Sig Figs Lots of zeroes What’s the Density, Kenneth? How wrong were you Secular Conversions

How many sig figs are in the following numbers: a b c. 700.

a. 4 b. 4 c. 3

How many sig figs would this measurement have?

3, estimate one extra place

Round the following numbers to 2 sig figs: a b c

a b c. 0.40

Calculate, using sig figs: 21 x 4.63 x

8.7

Calculate, using sig figs:

285.5

Convert to scientific notation:

4.51 x x 10 -4

When adding or subtracting in scientific notation, what must be the same?

The superscript

What is x 10 4 in correct scientific notation?

6.72 x 10 2

Calculate, and put into correct scientific notation and sig figs: (9.15 x 10 5 ) – (3.12 x 10 2 )

9.15 x 10 5

Calculate, and put into correct scientific notation and sig figs: (8.96 x ) x (2.7 x 10 5 )

2.4 x 10 3

What are the units for density?

g/cm 3 or g/mL

What is the order of density from least dense to most dense?

Oil, water, syrup

Using sig figs, what is the density of an object with a volume of 15.5 cm 3 and a mass of 3.21 g?

0.207 g/cm 3

Using sig figs, calculate the volume for a substance that has a density of 2.9 g/mL and has a mass of g.

7.3 mL

A cube is 2.56 cm x 3.89 cm x 9.10 cm, and has a density of 12.5 g/cm 3. What is the mass of the cube? (use sig figs)

1130 g

Draw a dart board that represents low accuracy and good precision.

Which of these sets is more accurate, if the accepted value is 20.0 g? Set 1Set g19.8 g 20.1 g19.2 g 20.5 g 19.5 g20.3 g

Set 1; average = 20 g ( set 2 average = g)

What is the difference between accuracy and precision?

Accuracy = close to accepted value Precision = measurements are all close together

Calculate the percent error if an object has an actual mass of 45.0 g and a student measures it to be 42.9 g.

4.6% error

If the percent error during a lab is 10% and the accepted value is 50 g, what was the measured value? (there are 2 possible answers)

55 g or 45 g

How many mL are in 1 L? How many g are in 1 kg?

1000 mL 1000 g

How many km are in 2567 cm?

km

How many miles are in 12,560 cm? (1 inch = 2.54 cm)

miles

How many mL are in 4.6 pints? 1 cup = L 1 pint = 2 cups

2200 mL

How many meters/day is 3.89 mph? 1 inch = 2.54 cm 1 mile = 5280 ft

1.50 x 10 5 m/day