Scientific Notation
Convert 30,100 to scientific notation
3.01 x 104
600,000
1 sig fig
1.4 cm
What is the formula and typical SI units for density?
mass/volume = density
units: g/cm3 or g/mL
What two things does every number need to tell us?
Units and sig figs!
Convert 9.32 x 10-5 to standard notation
0.0000932
200.
3 sig figs
500.00 x 16.3 =
8150
Define weight
Weight is the pull of gravity on a given mass
What is the SI unit for mass?
kg
Convert 0.00787 to scientific notation
7.87 x 10-3
0.000056809800
8 sig figs
Convert 25 degrees celsius to Kelvin
298 K
273 + 25= 298 K
Why does ice float in water?
The ice is less dense than the water -- less mass per unit of volume
What is the SI unit for temperature?
Convert 4.80 x 106 to standard notation
4,800,000
30.00
4 sig figs
If an object has a density of 20 g/mL and a mass of 400 g, what is the volume?
20 cm3
Define specific gravity and give the formula?
specific gravity = material density/ water density
comparison of a substance's density to water (or another reference) density
1000 mm = 1 m
Convert 89 to scientific notation
8.9 x 101
30 students
unlimited
Accounting for sig figs:
(3.01 X 1021) / (2.8 x 1015)
1.1 x 106
only 2 sig figs possible so must round up to 1.1
How is the density of something impacted by temperature?
Volume increases, mass stays the same--- so density DECREASES!
except water
How many picograms are in 1 gram?
10-12 picograms = 1 gram