Numbers
How many sig figs in 0.0024?
2
Which element has mass number 6?
C
First to propose matter is made of tiny, indivisible particles called *atomos*.
Democtirus
Electron Config for He
1s2
DNA
How many sig figs in 3.00500 x 105?
6
How many neutrons does C-14 have?
8
Atoms are indivisible, identical in an element, and combine in whole-number ratios to form compounds.
Dalton
Electron Config for B
1s22s22p1
Which scientist is famous for the phrase "every action has an equal and opposite reaction"?
Newton
What is the density of a sample with a mass of 32 g and a volume of 10 ml?
3 g/ml (sig figs!)
Which ion of Be is the most abundant?
Be-9
What did Bohr propose?
Planetary model; electrons orbit the nucleus in fixed energy levels.
[Ar] 4s2 3d⁵
Cr
What does Mach 1 mean?
The speed of sound. Or the sound barrier.
How many seconds are in a day?
86,400
Which group of the periodic table forms 2+ ions?
2
Gold foil experiment
Rutherford
Name this element
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d4
Sg
What is the name of the nearest star to Earth (other than the sun)
Proxima Centauri
A program you download has a file size of 32.5 MB. How many mB is that?
3.25 x 1010
Name an element that can produce 2+ and 3+ ions
Answers can vary, but generally transition metals
What year was the neutron discovered?
1932
Neutral Atom
[Ar] 4s1 3d9
Ni
What is it called when a solid goes straight to a gas?
Sublimation