Vocab
matter
56 sec -> days
6.5 x 10-4 days
The number of _____ determines the identity of an atom
protons
Argon has three naturally occurring isotopes: argon-36, argon-38, and argon-40. Based on argon’s reported atomic mass, which isotope exists as the most abundant in nature? Explain.
Ar-40 , closest to the given amu on the periodic table
How many apples are in 1 mole?
6.022 x 1023 apples
Explain the differences between qualitative and quantitative observations?
qualitative - no numbers are involved (colors, shape, sound, taste, smell, etc.)
quantitative - measurable (numbers and units, mass, volume, and temperature)
32 psi -> g/cm2
2200 g/cm2
237U92
Copper exists as a mixture of two isotopes. Copper-63 is 69.17% abundant and it has a mass of 62.9296 amu. Copper-65 is 30.83% abundant and it has a mass of 64.9278 amu. Calculate the atomic mass of copper.
63.55 amu
Ca(HSO3)2
What type of matter is made up of two or more substances physically combined? What two categories can it be split into?
Mixture; heterogenous and homogenous
70 in3 -> ml
1 x 103 mL
Determine the number of protons and neutrons given the symbol: 119Sn50
p = 50
n = 69
Calculate the atomic mass of silicon. The three silicon isotopes have atomic masses and relative abundances of 27.9769 amu (92.2297%), 28.9765 amu (4.6832%) and 29.9738 amu (3.0872%).
28.321 amu
How many sig figs are there:
1) 0.005020 mol
2) 37.00001 mg
3) 5.0 cm
4) 798 g
4
7
2
3
This unit of measurement measures average kinetic energy
temperature
9.81 m/s2 -> km/hr2
1.27 x 105 km/hr2
complete the following given: 24Mg12 +2
Element:
p+=
n =
e-=
Magnesium
12
12
10
If the masses of one isotope of nitrogen, nitrogen-14, is 14.003 amu and another isotope, nitrogen-15, is 15.000 amu, find the relative abundance of the isotopes.
N-14 = 99.6%
N-15 = 0.4%
write the formula for magnesium sulfate heptahydrate then find the molar mass
MgSO4 * 7H2O
246.51 g/mol
_______ = reproducible data but does not guarantee accuracy
precision
Can a 197 lb wrestler compete at weight class: 75 kg?
The wrestler weighs 89.4 kg therefore no they can not.
What do the following have in common?
Mg-24 Mg-25 Mg-26
They are isotopes: same # of protons
Antimony has two naturally occurring isotopes. The mass of antimony-121 is 120.904 amu and the mass of antimony-123 is 122.904 amu. Using the average mass from the periodic table, calculate the abundance of each isotope.
Sb-121= 57.2%
Sb-123= 42.8%
How many grams are there in 4.5 x 1022 molecules of barium nitrite?
17.1 grams