Sig Figs
How many sig figs in: 1220?
12,200 m = ____ km
12.2
Calculate the energy (E) of a photon a the frequency of 6.165 x 1014 Hz
4.1 x 10-19 J
You have a rock with a volume of 30cm3 and a mass of 60g. What is its density?
2 g/cm3
find the molar mass of CaCOH
69.09 grams
0.003 + 3.5198 + 0.0118
3.535
324,000 micrometers to hectometers
express in scientific notation
3.24 x 10-3
Calculate the wavelength (nm) of light that has a frequency of 1.5 x 1015 Hz
200 nm
A wooden cube has side lengths of 3 cm and weighs 27 grams. What is its density?
1 g/cm3
How many moles are in 22 grams of argon?
0.55 moles
Put the answer to this equation into scientific notation: 57 x 7.368
4.2 x 102
Convert 1 week to minutes
10,080 minutes
A photon of light has a wavelength of 0.050 cm. Calculate its energy.
3.98 x 10-22 J
A pencil has a density of .875 g/ml. It has a mass of 3.5 grams. What is the volume?
3.0625 mL
How many molecules are in 190 grams of NaF?
2.70 x 1024
(4.6 x 3.75) + 2.4
19.7
32 feet/second to meters/minute
1 meter is 3.28 feet
585 m/min
Calculate the total energy in 1.5 x 1013 photons of gamma radiation having l = 3.0 x 10-12 m
0.99 J
A cork has a volume of 16 cm3 and a density of 0.1875 mL. Calculate the mass.
85.3 grams
Find the average atomic mass of copper if Cu-63 has an abundance of 69.2% and Cu-65 has an abundance of 30.8%
63.616
(1.23 + 0.673 + 6.1) x (1.76)
14
You find $13,406 in pennies. If each penny weighs 4 grams, how much did all that loot weigh in lbs.? (2.2 lbs = 1 Kilogram
11,797 lb
The work function of an element is the energy required to remove an electron from the surface of the solid. The work function for lithium is 279.7 kJ/mol. What is the maximum wavelength of light that can remove an electron from an atom in lithium?
428 nm
An irregularly shaped stone was lowered into a graduated cylinder holding a volume of water equal to 2 ml. The height of the water rose to 7 ml. If the density of the stone is 5 g/mL, what is the mass?
25 grams
Europium (Eu) has two isotopes. One has a mass of 151 and the other is 153. If the average atomic mass for Europium is 151.97 amu, what are the abundances of the two isotopes?
51.5% Eu-151; 48.5% Eu-153