Search found 30 matches

by Amanda Cardenas 1J
Wed Jun 06, 2018 9:35 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.53
Replies: 2
Views: 190

Help on 3.53

I need help on 3.53. I'm still confused on the concept of formal charge.
3.53: Determine the formal charge of each atom in the following molecules. Identify the structure of lower energy in each pair. (The structures are in the book)
by Amanda Cardenas 1J
Wed Jun 06, 2018 8:19 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.49
Replies: 2
Views: 205

Help on 3.49

Need help on part d of 3.49. Specifically the formal charge.
3.49: Draw the lewis structure and determine the formal charge on each atom in
d) C2^2-
by Amanda Cardenas 1J
Wed Jun 06, 2018 6:33 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.39
Replies: 2
Views: 201

Help on 3.39

I need help on part a of 3.39. I'm not sure how exactly it should be structured.
3.39: Write the complete Lewis structure for the following compound:
a) ammonium chloride
by Amanda Cardenas 1J
Thu May 31, 2018 9:56 am
Forum: Ionic & Covalent Bonds
Topic: Help on 3.33
Replies: 1
Views: 178

Help on 3.33

Need help on part b of 3.33.
3.33: Write the lewis structure of
b) COCl2
by Amanda Cardenas 1J
Wed May 30, 2018 8:59 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.27
Replies: 1
Views: 199

Help on 3.27

I need help on part a of 3.27. Any help is appreciated.
3.27: On the basis of expected charges of the monatomic ions, give the chemical formula of each of the following compounds:
a) thallium(III) chloride
by Amanda Cardenas 1J
Wed May 30, 2018 2:53 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.25 [ENDORSED]
Replies: 3
Views: 220

Help on 3.25 [ENDORSED]

I need help with parts b, d, and e of 3.25.
3.25: On the basis of the expected charges on the monoatomic ions, give the chemical formula of each of the following compounds:
b) indium(III)
d) hydrogen telluride
e) bismuth(III) floride
by Amanda Cardenas 1J
Thu May 24, 2018 10:07 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.5
Replies: 2
Views: 189

Help on 3.5

I need help on part b of 3.5.
3.5: Give the ground-state electron configuration expected for each of the following ions:
b) Bi^3+
by Amanda Cardenas 1J
Wed May 23, 2018 10:13 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.13
Replies: 1
Views: 135

Help on 3.13

I need help on parts a and b for 3.13. Any help is appreciated.
3.13: For each of the following ground-state atoms, predict the type of orbital from which an electron will need to be removed to form the +1 ions:
a) Zn
b) Cl
by Amanda Cardenas 1J
Tue May 22, 2018 9:17 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.11
Replies: 1
Views: 131

Help on 3.11

I need help on parts b,c, and d for question 3.11.
3.11: Which M3+ ions (where M is a metal) are predicted to have the following ground-state electron configurations:
b) [Ar]3d^5
c) [Kr]4d^5
d) [Kr]4d^3
by Amanda Cardenas 1J
Thu May 17, 2018 11:04 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.23
Replies: 2
Views: 138

Help on 3.23

I need help on parts b and c of 3.23.
3.23: Chlorine can exist in both positive and negative oxidation states.
b)negative oxidation number that chlorine can have?
c) Write the electron configuration for each of these states.
by Amanda Cardenas 1J
Thu May 17, 2018 10:19 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.21
Replies: 2
Views: 119

Help on 3.21

I need help on c and d of 3.21. Any help is appreciated.
3.21: Give the ground-state electron configuration and numbers of unpaired electrons expected for each of the following ions:
c) Te2-
d) Ag+
by Amanda Cardenas 1J
Thu May 17, 2018 9:55 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.19
Replies: 1
Views: 94

Help on 3.19

I need help on part a and e of 3.19. I know how to do the other parts of the problem but just a and e are confusing me.
3.19: Give the ground-state electron configuration and number of unpaired electrons expected for each of the following ions:
a) Sb3+
e) Ni2+
by Amanda Cardenas 1J
Thu May 10, 2018 10:13 pm
Forum: Resonance Structures
Topic: Help on 2.51
Replies: 3
Views: 227

Help on 2.51

I need help on part a and d of 2.51. Any help is useful.
2.51: How many unpaired electrons are predicted for the ground-state configuration of each of the following atoms:
(a) Bi
(d) Ni
by Amanda Cardenas 1J
Thu May 10, 2018 8:36 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 2.45
Replies: 2
Views: 139

Help on 2.45

I need help on part c and d of 2.45. Please include steps on how to do them too.
2.45: Which elements are predicted to have the following ground-state electron configurations:
(c) [He]2s^22p^2
(d) [Rn]7s^26d^2
by Amanda Cardenas 1J
Thu May 10, 2018 8:08 pm
Forum: Lewis Structures
Topic: Help on 2.31
Replies: 1
Views: 164

Help on 2.31

Can someone help me with part b of 2.31. Any help is needed.
2.31: Which of the following subshells cannot exist in an atom:
(b) 4d
by Amanda Cardenas 1J
Thu May 03, 2018 10:28 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 2.43
Replies: 3
Views: 190

Help on 2.43

I need help with parts a, b and d for 2.43. Any help is needed. Thanks.
2.43: What is the ground-state electron configuration expected for each of the following elements:
(a) Silver
(b) Beryllium
(d) Gallium
by Amanda Cardenas 1J
Wed May 02, 2018 10:48 pm
Forum: Lewis Structures
Topic: Help on 3.35
Replies: 2
Views: 156

Help on 3.35

I need help on parts (a) and (c) for question 3.35. Thank you in advance.
3.35: Write the Lewis structure of
(b) hypobromite ion, BrO-
(c) amide ion, NH2-
by Amanda Cardenas 1J
Tue May 01, 2018 5:10 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.9 (b) [ENDORSED]
Replies: 2
Views: 142

Help on 3.9 (b) [ENDORSED]

Hello. I know how to do 3.9 (a) but I'm having trouble doing part (b). Any help matters. Thank you.

3.9: Which M2+ ions are predicted to have the following ground-state electron configurations:
(b) [Ar]3d^6
by Amanda Cardenas 1J
Thu Apr 26, 2018 7:39 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.9 Help
Replies: 1
Views: 122

2.9 Help

2.9: What is the probability of finding an electron anywhere in a sphere of radius
a) a0 or
b) 2a0
in the ground state of a hydrogen atom?
by Amanda Cardenas 1J
Thu Apr 26, 2018 7:37 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.5 Help
Replies: 1
Views: 105

2.5 Help

2.5: Evaluate the probability of finding an electron in a small region of a hydrogen 1s-orbital at a distance 0.55a0 from the nucleus relative to finding it in the same small region located at the nucleus.
by Amanda Cardenas 1J
Thu Apr 26, 2018 7:35 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.1 help [ENDORSED]
Replies: 3
Views: 180

2.1 help [ENDORSED]

2.1: Which of the following increase when the electron in a hydrogen atom undergoes a transition from the 1s-orbital to a 2p-orbital?
a) Energy of the electron
b) Value of n
c) Value of l
d)Radius of the atom
by Amanda Cardenas 1J
Tue Apr 17, 2018 12:06 am
Forum: Properties of Light
Topic: 1.30 [ENDORSED]
Replies: 1
Views: 106

1.30 [ENDORSED]

Need help on starting this problem. Also please include the steps on how to solve this problem.
1.30: The very hot star Spica has a surface temperature of 23 kK (2.3 x 10^4 K). At what wavelength does Spica emit the maximum intensity of light?
by Amanda Cardenas 1J
Tue Apr 17, 2018 12:02 am
Forum: Properties of Light
Topic: 1.24
Replies: 1
Views: 113

1.24

Need help on how to start this problem.
1.24: A mixture of argon and mercury vapor used in blue advertising signs emits light of wavelength 470 nm. Calculate the energy change resulting from the emission of 1.00 mol of photons at this wavelength.
by Amanda Cardenas 1J
Tue Apr 17, 2018 12:00 am
Forum: Properties of Light
Topic: 1.23
Replies: 3
Views: 166

1.23

Need help on this problem.
1.23: The y-ray photons emitted by the nuclear decay of a technetium-99 atom used in radoopharmaceuticals have an energy of 140.511 keV. Calculate the wavelength of these y-rays.
by Amanda Cardenas 1J
Tue Apr 10, 2018 4:37 pm
Forum: Properties of Light
Topic: Need help on 1.4
Replies: 2
Views: 188

Need help on 1.4

I need help on question 1.4. Any advice on how to conquer questions like this will be greatly appreciated. 1.4: Which of the following statements about the electromagnetic spectrum is true? Explain your reasoning. a) X-rays travel faster than the infrared radiation because they have higher energy. b...
by Amanda Cardenas 1J
Tue Apr 10, 2018 4:36 pm
Forum: Properties of Electrons
Topic: Need help on 1.17
Replies: 1
Views: 170

Need help on 1.17

I need help on problem 1.17. Here is the question:
1.17: The energy levels of hydrogenlike one-electron ions of atomic number Z differ from those of hydrogen by a factor of Z^2. Predict the wavelength of the transition from n =2 to n=1 in He+.
by Amanda Cardenas 1J
Tue Apr 10, 2018 4:32 pm
Forum: Properties of Light
Topic: Need help on 1.16
Replies: 2
Views: 623

Need help on 1.16

I need help on problem 1.16. Here is the question:
1.16: A violet line is observed at 434 nm in the spectrum of atomic hydrogen. Determine the values of n for the beginning and ending energy levels of the electron during the emission of energy that leads to this spectral line.
by Amanda Cardenas 1J
Thu Apr 05, 2018 11:37 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.29
Replies: 1
Views: 222

E.29

I need help with this question. I'm not sure exactly how to start it. Also if anyone has advice on how to start these problems or a better way to look at them, let me know. Here is the question: A chemist measured out 8.61g of Copper (II) chloride tetra hydrate, CuCl2 X 4H2O. A) How many moles of Cu...
by Amanda Cardenas 1J
Thu Apr 05, 2018 11:29 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.27
Replies: 2
Views: 152

Re: E.27

Basically for part b, divide 1000g by the molar mass of H2O which is 18.02 g X mol^-1. Then multiply that by Avogadro's number, 6.022x10^23 moles X mol^-1. And that should get you your answer.
This is how it looks like:
(1000g/18.02 g X mol^-1)(6.022x10^23 moles X mol^-1) = 3.34 x 10^25 moles
by Amanda Cardenas 1J
Thu Apr 05, 2018 11:18 am
Forum: Balancing Chemical Reactions
Topic: H.5: Balancing Equations
Replies: 6
Views: 522

H.5: Balancing Equations

I'm still having problems with balancing equations. Somewhere in the middle of balancing equations I get confused and mixed up. If anyone has any advice on how to start balancing equations or the best way to solve them, let me know. Anyways, here is the question: Balance the following skeletal chemi...

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