Scientists
Developed the Atomic Theory containing 5 postulates.
Dalton
positively charged subatomic particle
proton
mass is neither created or destroyed
Conservation of Mass
What is the atomic mass of lithium?
6.941
6.02 x 1023
Conducted experiments in the late 1800s showing that cathode rays were composed of negatively charged particles.
JJ Thompson
the atomic mass is the total mass of these two subatomic particles
protons and neutrons
a chemical compound contains the same elements in the same proportions regardless of sample or source
definite proportions
6
How do you convert from grams to moles?
multiply by molar mass
With Thompson, Robert Milikan's carried out experiments called _______ and measured the charge of an electron.
Oil Drop Experiment
the empty space of the atom, that takes up most of the volume contains this subatomic particle
electrons
The Law of Multiple Proportions states that the ratio of masses of two elements that combine in different ratios will always be a small _______ number.
whole
How many neutrons does cobalt contain?
32
What does the molar mass represent in regards to grams and moles?
The # of grams that represents 1 mole.
Earnest Rutherford's experiments that helped show the existence of a positively charged nucleus.
Gold Foil Experiment
the subatomic particle that determines the type of atom and it's properties
protons
water molecules from the ocean and water molecules from a river contain 2 hydrogen and 1 oxygen.
Law of Definite Proportions
Which atom on the periodic table has 14 protons?
silicon
How do you convert grams to atoms?
divide by molar mass, then multiply by avogardro's number
Rutherford's student that developed the first atomic model with subatomic particles.
Neils Bohr
The forces within the nucleus that keeps holds similarly charged subatomic particles together.
nuclear forces
In your lab last week, which law did you demonstrate?
Conservation of Mass
What does varying the number of neutrons between atom of the same elements results in?
isotopes
What number is required to know in order to convert between grams and moles?
molar mass