Experiments and stuff
Like charges ________
Repel
Carbon has an atomic mass of 12.0111. What is its most abundant Isotope?
Carbon-12
What is the charge of a Proton, Neutron, and Electron?
+, n, -
Who developed the first atomic theory that included five points about atoms?
John Dalton
How many moles are present in 9.06g of
H_2
4.49 mol
H_2
What did Rutherford and his crew shoot aplha particles through?
Gold Foil
How many Protons and Neutrons in Li-7
3 Protons and 4 Neutrons.
In a non-ion the number of electrons are equal to what?
Protons
Describe the experiment used to disprove the idea of the "Plum Pudding Atom."
Rutherford's experiment
0.45 mol O to mas O
7.2 g O
What is the plum pudding atom? Draw it yo!
Model of an atom consisting of positively charged "pudding" with electrons scattered throughout.
What is different in an Isotope, what is the same?
Protons and Electrons are the same. Neutrons change because of different mass.
Where are electrons found?
Electron cloud.
Who is credited with discovering electrons with his experiments with cathode rays?
J.J. Thomson
How many moles are there in molecules of H2O2
2.37*10^23
.394 moles of H2O2
What did Rutherford Experiment prove?
Small positively charged mass inside of atom called "Nucleus." Atom is mostly empty space.
What is an Isotope?
more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
How many electrons in Nickel with a +2 charge?
26
Who is responsible for the idea of a positively charged nucleus after shooting Alpha Particles through gold foil?
Rutherford.
How many atoms are there in 1.5 Moles of NaOh
9.03 x 1023
What happened during the cathode ray experiment, and how did that prove the existence of electrons?
A ray of light flowing through a Cathode called a "Cathode Ray." Went from - to +, electricity goes from + to _. Repel by a negative magnet.
How many Neutrons in Carbon-14
8 yo.
How many Electrons in a -3 charge Silver atom?
50.
Who is credited with the creation of the Plum Pudding model?
J.J. Thomson
What is mass in grams of 6.02 x 1023 atoms of C
12.01 g