Chapter 3 Marking

You did really really well on this one! Congrats! You seem like you really know your stuff!
One comment that I'd like to make is that a lot of the questions need more than a one sentance answer. They need a bit more detail. Hope that helps!


3. (3/4) a. The nucleus of the atom is not neutral because it contains the protons and no electrons

a. T
b. F
c. F
d. T


5. (4/4) Are these the answers for atomic number or mass number?

a. 2, 4
b. 4, 9
c. 5, 9
d. 28, 58


7. (3/4) c. (-0.5)The number of neutrons would be the mass number-atomic number (ie the total number of objects in the nucleus minus the number of protons). Therefore, the correct answer is 24 neutrons. d. (-0.5) There would be 157 neutrons, 100 protons, and 100 electrons.

a. 8 neutrons, 8 protons, 8 electrons
b. 10 neutrons, 8 protons, 8 electrons
c. 22 neutrons, 20 protons, 20 electrons
d. 146 neutrons, 92 protons, 92 electrons


11. (4/4)

a. s, cl, ar, k
b. ar, k, cl ,s
c. s, cl, ar, k
d. s, k , cl, ar


13. (4/4) W00T! So schmart :)

a. protons 24, neutrons 29, electrons 24, nucleons 53, total sub atomic particles 77
b. p=101 , n=155 , e=101 , nu=256 , sap= 357
c. p=30 , n=37 , e=30 , nu=67 , sap=97
d. p=20 , n=20 , e=20 , nu=40 , sap=60


17. (4/4)

a. F
b. F
c. T
d. T


25. (4/4) Very good answer!

This is because to discover the atomic mass all the istopes is added together and dived leaving an number that isn't whole.

31. (4/4) 
a. K, Rb
b. P, As
c. Sr, Ba
d. Na, Cs


39. (4/4)

a. S
b. P
c. I
d. Cl


43. (4/4)

a. orbital
b. orbital
c. shell
d. sub shell


45. (3/4) d. The "p" subshells all contain the same number of electrons, regardless of which shell they are a part of.

a. T
b. T
c. F
d. F


47. (4/4) Expert!

a. 2
b. 2
c. 6
d. 18


49. (4/4) Excellent!

a. 1s^2 2s^2 2p^2
b. 1s^2 2s^2 2p^6 3s^1
c. 1s^2 2s^2 2p^6 3s^2 3p^4
d. 1s^2 2s^2 2p^6 3s^2 3p^6


51. (4/4)

a. oxygen
b. neon
c. aluminum
d. argon


55. (3/4) You can't have two spin up electrons in the same orbital, unfortunately as is depicted in a.

(o represents up and x represents down)

1s 2s 2p 3s 3p 4s 3d
a. ox ox oo
b. ox ox oxoxox o
c. ox ox oxoxox ox o
d. ox ox oxoxox ox oxoxox ox oxoxo





3) (2/3) You have inadvertently used the circumference of the earth, instead of the diameter...
The correct number of sigfigs were needed to be used in this question.

ok so in the book we are told a diameter of 2.9 inches for a nucleus of of an atom that is 2.5 miles

1 mile = 1.609 km
1 inch = 2.54 E-5 km

2.9 inches = 7.366 E-5 km
2.5 miles = 4.0233 km

the distance around the earth at the equator is approximately 40,074 km according to here 

40,074 km / 4.0233 km = 9,960.4

so 9,960.4 x 7.366 E-5 km = 0.73308 km


4) (4/4) Very good!

a quark makes these up, the six flavours are up, down, charm, strange, top, and bottom. (Their names were chosen arbitrarily based on the need to name them something that could be easily remembered and used.)


5) (3/3) Lol about the game!!

protium is required for ammonium.
deuterium is used in the manufacturing of nuclear weapons.
tritium is used in flares, emergency lights, exit signs as a source of light.


on a side note: apparently "every time you view a galaxy or system, you use 10 Deuterium" according to this gaming site here I can't begin to think how much of this deuterium i've wasted looking at the night sky.


6) (1/4) I needed a lot more detail in this question!! Sigfigs need to be addressed as well!

The reasoning the average atomic mass needs to be a weighted average is because of the possibility of the various isotopes being in a similar compound. This value makes a generalization to simplify the additional properties of the relative amu.


7) (4/4) 
24-Mg 78.99% = 19 amu
25-Mg 10% = 2.5 amu
26-Mg 11.01% = 2.8 amu

total = 24.3 amu


8) (+1 for pure cheek! Free points! Ha - I only give one point for cheek)
question doesn't exist? free points? the answer is true


9) (2/3) Of course there are metals found in the body!! What do you consider copper to be, or zinc, or any of those other trace metals?

There are no metals normally present as such in the body, except those put there during surgery.

These are the elements present in a human
1. Oxygen (65%)
2. Carbon (18%)
3. Hydrogen (10%)
4. Nitrogen (3%)
5. Calcium (1.5%)
6. Phosphorus (1.0%)
7. Potassium (0.35%)
8. Sulfur (0.25%)
9. Sodium (0.15%)
10. Magnesium (0.05%)
11. Copper, Zinc, Selenium, Molybdenum, Fluorine, Chlorine, Iodine, Manganese, Cobalt, Iron (0.70%)
12. Lithium, Strontium, Aluminum, Silicon, Lead, Vanadium, Arsenic, Bromine (trace amounts)

vitamin b-12 is in metallic cobalt, the possibility of me consuming it is there in when I eat my wheaties.


10. (0.5/2) Yes, these do refer to the placement of electrons. There is a blurby in your text that gives the meaning - sharp, principal, diffuse, and fundamental.

these refer the placement of the electrons i really dont know how to describe this further


11. (0/4) The answer is Shell, Subshell, Orbital, Spin

I cant find this one


12. (5/4) Very good!! Wow! Your answer on this one really exceeded my expectations!

These values depend on the element in quesiton


every orbital holds a max of 2 electrons

1s = 2
2s = 2
2p = 6
3s = 2
3p = 6
4s = 2
3d = 10
4p = 6
4d = 10
4f = 14

shell 1 = 2
shell 2 = 8
shell 3 = 18
shell 4 = 32


13. (3/3)

there are 10 subshells filled
there are 16 orbitals filled
there are 32 electrons


14. (0/3) You know that for every proton there is a neutron, and that for approximately every proton there is a neutron. You know that the electrons weigh virtually nothing compared to the protons and neutrons. Take your weight in kilograms and cut it in half (your weight in protons alone). Find the weight of a proton in kilograms. Divide your halved weight by the weight of a proton. This will give you the number of protons. This is equal to the number of electrons - ha problem solved!

Billions?
I'm at a loss how to solve this one


 Bonus (2/3) Why do they react in this fashion?

The thing I've noticed most is the fact they like to combust. The higher on the periodic table the greater the combustion, simply because the higher the element the more energy it contains.


Total Chapter Marks: 56 / 60 = 93%
Total Assignment Marks: 25.5 / 35 = 73%
Bonus: 2
Total: 81.5 / 95 = 86%