This is my homework/study guide for my midterm and i need a little help reviewin
ID: 1035002 • Letter: T
Question
This is my homework/study guide for my midterm and i need a little help reviewing it. (I would like a second pair of eyes to double check it all.) I have a few days until its due.
Question 1
Kinetic energy is a measure of the stability of the molecules.
True
False
1 points
Question 2
Microwave is radiation of a lower energy than that of visible light.
True
False
1 points
Question 3
Heat flows from a system at a higher temperature to a system at a lower temperature.
True
False
1 points
Question 4
A chemical reaction that takes place due to the absorption of light is also called a photochemical reaction.
True
False
1 points
Question 5
When more energy is needed to break bonds than make bonds in a chemical reaction, the reaction is endothermic.
True
False
1 points
Question 6
Sodium and chloride ions that are close to one another have greater potential energy than those far apart from each other.
True
False
1 points
Question 7
Dry ice has less potential energy than gaseous carbon dioxide.
True
False
1 points
Question 8
UV-A is the ultraviolet radiation that activates the production of vitamin D.
True
False
1 points
Question 9
Atmospheric scientists are concerned with the increasing concentration of ozone in the upper atmosphere.
True
False
1 points
Question 10
A system loses the capacity to work when it gains energy.
True
False
1 points
Question 11
Match the wavelength from the first column with the region of electromagnetic radiation in the second column.
-A.B.C.D.E.
0.00001 nm
-A.B.C.D.E.
250 nm
-A.B.C.D.E.
500 nm
-A.B.C.D.E.
1000 nm
-A.B.C.D.E.
1000000 nm
A.
gamma rays
B.
ultraviolet radiation
C.
microwaves
D.
visible light
E.
infrared radiation
2 points
Question 12
The n = 5 principal energy level can hold a maximum of 25 electrons.
True
False
1 points
Question 13
The f-block represents a region on the periodic table which is 10 elements in width.
True
False
1 points
Question 14
Electrons entering orbitals in the same sublevel do so in such a way so as to maximize the number of unpaired electrons.
True
False
1 points
Question 15
It is impossible to know exactly where an electron is and what it is doing.
True
False
1 points
Question 16
The p-block represents a region on the periodic table which is six elements in width.
True
False
1 points
Question 17
The sublevels in a principal energy level are differentiated by the shapes of the orbitals and their potential energy.
True
False
1 points
Question 18
Elements filling the d-block are known as the transition elements.
True
False
1 points
Question 19
The 90% boundary indicates the area where 90% of the time the electron may be found.
True
False
1 points
Question 20
A stationary standing waveform is used to describe an electron. This means that the electron at any given time is at a standstill.
True
False
1 points
Question 21
The correct shortcut for writing the electronic configuration of Sr is [Ar]4s2.
True
False
1 points
Question 22
Classify each of the following as ground state, excited state, or impossible electronic configurations.
-A.B.C.
1s22s22p63s13p3
-A.B.C.
1s22s22p63s23p8
-A.B.C.
1s22s22p63s23p64s1
-A.B.C.
1s22s22p63s23p64s24p1
-A.B.C.
1s22s22p63s23p64s23d5
-A.B.C.
1s22s22p63s23p64s23d12
-A.B.C.
1s22s22p62d2
A.
Ground state
B.
Excited state
C.
Impossible state
2 points
Question 23
Match the outermost occupied orbital(s) in the first column with the corresponding element in the second column.
-A.B.C.D.E.F.G.H.I.J.
5s2
-A.B.C.D.E.F.G.H.I.J.
4p5
-A.B.C.D.E.F.G.H.I.J.
3d5
-A.B.C.D.E.F.G.H.I.J.
3d10
-A.B.C.D.E.F.G.H.I.J.
5p6
-A.B.C.D.E.F.G.H.I.J.
4f10
-A.B.C.D.E.F.G.H.I.J.
6d1
-A.B.C.D.E.F.G.H.I.J.
5d8
-A.B.C.D.E.F.G.H.I.J.
1s2
-A.B.C.D.E.F.G.H.I.J.
5p3
A.
Dy
B.
Br
C.
Xe
D.
Zn
E.
Mn
F.
Sr
G.
He
H.
Pt
I.
Lr
J.
Sb
2 points
Question 24
Elements that belong to the same group have the same number of valence electrons.
True
False
1 points
Question 25
Carbon dioxide has two non-bonded pairs.
True
False
1 points
Question 26
Bromine has seven valence electrons.
True
False
1 points
Question 27
A single, neutral chlorine atom has seven valence electrons.
True
False
1 points
Question 28
One could say that the trigonal pyramidal structure is the tetrahedral arrangement minus a bond but with a lone pair.
True
False
1 points
Question 29
Silicon has five valence electrons.
True
False
1 points
Question 30
Multiple covalent bonds arise when two atoms will share more than one pair of electrons with each other.
True
False
1 points
Question 31
When predicting molecular geometries, the multiple bond is treated as a single electron group, just the way a single bond is treated.
True
False
1 points
Question 32
The nitrogen atom in ammonia, NH3, has three bonds and three non-bonded pairs of electrons.
True
False
1 points
Question 33
In its ground state, sulfur has two electrons and always needs four more to reach the octet.
True
False
1 points
Question 34
Match each molecule listed with the shape of the molecule.
-A.B.C.D.E.
hydrogen fluoride
-A.B.C.D.E.
water
-A.B.C.D.E.
ammonia, NH3
-A.B.C.D.E.
boron trifluoride
-A.B.C.D.E.
carbon tetrachloride
A.
linear
B.
bent
C.
trigonal
D.
pyramidal
E.
tetrahedral
2 points
Question 35
Match each element listed with the number of electrons it needs to fulfill its octet.
-A.B.C.D.E.F.G.H.
oxygen
-A.B.C.D.E.F.G.H.
nitrogen
-A.B.C.D.E.F.G.H.
carbon
-A.B.C.D.E.F.G.H.
sulfur
-A.B.C.D.E.F.G.H.
phosphorus
-A.B.C.D.E.F.G.H.
beryllium
-A.B.C.D.E.F.G.H.
fluorine
-A.B.C.D.E.F.G.H.
lithium
-A.B.C.D.E.F.G.H.
chlorine
-A.B.C.D.E.F.G.H.
argon
-A.B.C.D.E.F.G.H.
boron
-A.B.C.D.E.F.G.H.
neon
-A.B.C.D.E.F.G.H.
sodium
-A.B.C.D.E.F.G.H.
aluminum
A.
1
B.
2
C.
3
D.
4
E.
5
F.
6
G.
7
H.
0
2 points
Question 36
Match every compound listed with the proper account of bonds found in the compound.
-A.B.C.D.E.
carbon dioxide
-A.B.C.D.E.
ammonia, NH3
-A.B.C.D.E.
hydrogen cyanide
-A.B.C.D.E.
ethene, C2H4
-A.B.C.D.E.
acetylene, C2H2
-A.B.C.D.E.
hydrazine, N2H4
-A.B.C.D.E.
nitrogen, N2
-A.B.C.D.E.
oxygen, O2
-A.B.C.D.E.
0.00001 nm
-A.B.C.D.E.
250 nm
-A.B.C.D.E.
500 nm
-A.B.C.D.E.
1000 nm
-A.B.C.D.E.
1000000 nm
A.
gamma rays
B.
ultraviolet radiation
C.
microwaves
D.
visible light
E.
infrared radiation
Explanation / Answer
Q1. False. Kinetic energy has nothing to do with the stability of a molecule. Do you think water at 273 K (lower kinetic energy) is more stable than water at 373 K (higher kinetic energy)? No, right. To break the bonds of water you are going to need the same amount of energy at both the temperature. I hope above question answers your query! Potential energy is a good measure of stability of molecule and not kinetic energy. NOTE that Kinetic energy is proportional to square of velocity, and velocity of a molecule can be increased or decreased by increasing or decreasing the temperature.
Q2. True. E = hv where E is energy, h is Plank's constant, v is frequency. So, higher frequency means higher energy. As microwave radiation (3*1010-3*1012 Hz) is lower than the visible region (3*1014-3*1015 Hz). Hence, the statement is true.
Q3 True. The statement is second law of themodynamics.
Q4. True. Any chemical reaction which occur by absorption of light is called photochemical reaction.
Q5. True. In Endothermic reactions more energy is required to make bonds than break bond, and this diffrence of energy is taken from surrounding, that is why endothermic reaction result into cooling of system (reaction mixture).
Q6. True. For charged species potential energy is inversely proportional to square of distance (Coulomb's Law). So, smaller the distance larger the potential energy and vice-versa.
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