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chemistry mid-term review #2 Flashcards | StudBud
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chemistry mid-term review #2
chemistry mid-term review #2
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1
1s2 2s2 2p6 3s2 3p6... what will be the next sublevel to fill in?
3d
4s
4p
<p>3d </p>
2
Whose experiments with oil droplets determined the charge of electrons
Millikan
Democritus
Dalton
Bohr
3
Consider a neutral atom with 30 protons and 34 neutrons. The mass number is
34
64
30
4
4
A calculator answer of 423.6059 must be rounded to 3 sig figs. What is the answer?
420
423
423.6
424
5
Which of the following is NOT true for the atoms, N-13, N-14, & N-15?
They are isotopes
They all have 7 electrons
They all have the same mass number
They all have the same atomic number
6
What is the mass of 53 mL of ethyl alchol, which has a density of 0.79 g/mL?
42 g
41.9 g
67.1 g
53 g
7
A 50.0 mL liquid sample has a mass of 50.7 g. The density of the sample is __________.
50.7
1.01
1.01 g/mL
0.986 g/L
8
How many kilograms are in 30.4 lb? ( 1 kg = 2.2 lb)
14 kg
13.8 kg
67 kg`
66.9 kg
9
Valence electrons are electrons located
in the highest energy level
in the lowest energy level of an atom
in the nucleus of an atom
throughout the atom
10
Protons, neutrons, and electrons are examples of _______________.
subatomic particles
ions
elements
compounds
11
A temperature of 54 degrees celsius is what in Kelvin?
273 K
54 K
-219 K
327 K
12
1s2 2s2 2p6 3s1 is what element?
P
Ne
K
Na
13
Which is NOT apart of Dalton's atomic theory?
electrons are outside of the nucleus
In a chemical reaction atoms are separated or combined
Matter is composed of atoms
Atoms of the same element are identical
14
The number of signficant figures in the measurement of 45.030 mm is _____________.
3
4
5
0
15
How many valence electrons are in the electron-dot structures for the elements in group 3A /13?
3
4
2
1
