History
Atoms and Photons
Chemical Bonds
Chemical Formulas
Chemical Reactions
100
Ernest Rutherford determined that an atom's positive charge resides in a small, massive nucleus by shooting alpha particles at foil composed of this metal. 
What is gold?
100
Atoms are made up of these three subatomic particles. 
What are protons, neutrons, and electrons?
100
This is the smallest unit of an element.
What is an atom?
100
This is the chemical name for water. 
What is dihydrogen monoxide?
100

H2 (g) + O2 (g) -> 2 H2O (g) 

If we have 2 moles of H2 and 1 mole of O2, this is the limiting reactant. 

What is O2?

200
Bohr's theory said that electrons can exist only in certain allowed orbitals. This is the name for the lowest energy orbital. 
What is the ground state?
200
The element sodium belongs to group 1A which goes by this name. 
What are the alkali metals?
200
Atoms share electrons in this type of bond.
What is a covalent bond?
200
This is the formula for potassium (K) iodide.
What is KI?
200
This is the number of moles in a mole of moles. (Avogadro's number)
What is 6.022E23?
300
This scientist determined the charge-to-mass ratio of an electron. 
Who is J. J. Thomson
300
The isotopes chlorine-35 and chlorine-37 have different numbers of these subatomic particles.
What are neutrons?
300
These are the electrons that participate in bonding. 
What are valence electrons?
300

This is the formula for the compound aluminum (Al) bromide (Br). 

What is AlBr3?

300

C3H8 (g) + O2 (g) -> CO2 (g) + H2O (g)

This is the unbalanced form of this balanced equation. 

What is 

C3H8 (g) + 5 O2 (g) -> 3 CO2 (g) + 4 H2O (g)?

400
This scientist determined the mass of the electron.
Who is Robert Millikan?
400
Carbon-13 has this many neutrons.
What is 7?
400
This is the electron configuration for nitrogen.

What is 1s22s22p3?

400
This is the formula for aluminum oxide. 

What is Al2O3?

400
This is the formula for percent yield.
What is [(actual yield)/(theoretical yield)] * 100%? 
500
This was the name of J. J. Thomson's early model of the atom. 
What is the plum pudding model?
500
According to the Bohr model. Atoms emit light (photons) when electrons do this. 
What is move from a higher energy state (orbital) to a lower energy state (orbital)?
500
An oxide anion has this charge. 

What is -2?

500
This is the formula for sulfur hexafluoride. 

What is SF6?

500

This is the percent hydrogen in methane. (CH4)

What is 25.13%?
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