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Chem 1 Midterm 2020
Chem 1 Midterm 2020
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1
Atoms in a bond that have an equal attraction for shared electrons.
polar
ionic
dipolar
non polar
2
The reason the evaporation point of HF is high is
covalent bonding
hydrogen bonding
LD forces
ionic bonding
3
According to the quantum theory of the atom
an electron has no energy
electrons travel around the nucleus on fixed paths
an electron's position cannot be known precisely
electrons cannot be found
4
Dalton's theory of the atom says
all matter is made of ions
all matter is made of different elements that cannot be divided or combined
all matter is made of atoms
most of the mass of the atom is in the nucleus
5
What is the polarity of this molecule?
arctic fox
polar bear
non polar
polar
6
The attraction of
one polar molecule to another polar molecule
is the basis for which of these?
LD attractive forces
orbital hybridization
metallic bonding
dipole diple attractions
7
The measurement 0.046770 has how many sig figs?
none
3
7
5
8
What is the percent by mass of carbon in carbon dioxide?
72.71%
27.29%
28%
12.01%
9
A gas state of matter can be described as
having lost electrons
no definite shape or volume
having a definite volume but not a definite shape
having definite shape and volume
10
What group tends to give away 1 electron to form bonds with other atoms?
alkaline earth metal
noble gases
halogens
alkali metal
11
Which of the following lists atomic orbitals in the correct order they are filled according to the Aufbau principle?
1s 2s 2p 3s 3p 3d 4s 4p 5s
1s 2s 3s 4s 3p 3d 4p 5s
1s 2s 2p 3s 3p 4s 3d 4p 5s
1s 2s 2p 3s 3p 4s 4p 3d 4d
12
Which 2 orbitals could never exist? (choose 2)
4p
7d
3f
3d
13
Give the name for this formula: SF
6
hexasulfide monfluoride
sulfur hexafluoride
sulfur flourine
mono sulfur fluoride
14
A nitrogen atom has how many valence electrons?
3
5
8
15
15
The charge on Lead in this compound is +2: PbO
2
False
True
16
In the electron configuration for chromium (atomic number 24), what is the notation for the
highest energy electrons
?
4s4
4s24p1
4s23d4
3d4
17
What is the
weakest
intermolecular force water experiences?
LD attractive forces
Dipole Dipole forces
Hydrogen Bonding
Covalent bonding
18
Which has the greatest atomic radii?
B
Ni
F
Cs
19
What does the 238 represent in Uranium- 238?
the mass defect
the number of neutrons
the mass number
the atomic number
20
The attraction (affinity) of Group 17 (halogens) for their own valence electrons is
weak
strong
zero
super weak
21
An atom is electrically neutral because
the number of protons and electrons are equal
neutrons balance protons
nuclear forces stabilize charges
the number of protons and ions are equal
22
What is the VSEPR shape of HCN?
trigonal planar
linear
tetrahedral
bent
23
A mixture is
a combination of pure substances bonded chemically
any substance with a uniform composition
a blend of 2 or more kinds of matter, each maintaining own properties
any group of elements that are chemically bonded to one another
24
How many single bonds are in a molecule of CH
2
Cl
2?
2
5
4
3
25
An isotope of Palladium has 46 protons, 46 electrons and 59 neutrons. Its
mass number
is
26
46
105
13
26
Give the molar mass of C
6
Br
4
O
2
391 g/mol
424 g/mol
423.68 g/mol
411.25 g/mol
27
What is the formula for Magnesium Sulfite?
Mg(SO4)2
MgSO3
MgSO2
SO3Mg
28
The 6 in the atomic notation below represents
the number of ions
the number of neutrons
the atomic number
the mass number
29
Use scientific notation to put this value into 2 sig figs: 345000
3.4 x 105
3.5x105
3.5 x 103
3.45 x 105
30
How many non polar bonds does this molecule have?
12
3
6
2
31
The element that has the lowest electronegativity is
oxygen
fluorine
sodium
chlorine
32
The Rutherford experiment concluded
atoms are not mostly empty space
atoms have a nucleus
atoms can combine with other atoms
only neutrons form the nucleus
33
The mass of sample containing 2.5 mol of silicon atoms is
(molar mass is 28.09 g/mol)
?
70. g
0.090 g
70.0 g
0.09 g
34
Phosphorus has the atomic number of 15 and a mass number of 31. It has
15 neutrons
15 electrons
16 protons
31 protons
35
When ice melts to liquid water, this is best described as a____ change.
molecular
atomic
physical
chemical
36
Identify the element based on this electron configuration:
Chlorine
Sulfur
Selenium
Silicon
37
What is the VSEPR shape of the pictured molecule?
bent
linear
bendy
trigonal pyramidal
38
A compound is found to contain 50.05 % sulfur and 49.95 % oxygen by weight. What is the empirical formula?
SO2
S1.5O3
SO
S20
39
How many molecules are there in 6.0 g of glucose, C
6
H
12
O
6
?
2.00x 1022 molecules
2.0 x 1022 molecules
3.6 x 1024 molecules
.03 molecules
40
Isotopes of the same element have a different number of
electrons
neutrons
protons
orbitrons
41
Iodine monochloride (ICl) has a higher boiling point than chlorine (Cl
2
) partly because it is a
polyatomic ion
metal
polar molecule
non polar molecule
42
CaBr
2
dissolves in water. It's individual charges are
Ca-2 and Br -1
Ca+2 and Br + 1
Ca +2 and Br -2
Ca+2 and Br -1
43
Hydrogen and oxygen come together to make water. Water is considered to be the
reactant
equilibria
flamingo
product
44
An isotope has a half life of 10 years. If you have 20.0 grams existing today, how long will it take to get to 2.5 g
40 years
30 years
10 years
5 years
45
You are given a compound with the formula KX, where X is a nonmetal with 53 electrons. What is the identity of X?
As
Cl
C
I
46
Which is the most unstable radioactive element?
beryllium- 7 = 53 days
rhodium- 1 = 30 seconds
carbon- 14 = 5,730 years
sodium- 24 = 15 hours
47
The 4th energy level contains _______orbitals.
4
16
3
9
