Search found 27 matches

by Haya Rabadi 1F
Thu Jun 14, 2018 1:58 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: French Toast 28
Replies: 3
Views: 228

French Toast 28

I'm confused how HI is a stronger acid than HCl. What are some rules or trends to figure out what are the stronger acids? I though polarity aka electronegative trends helped to figure out the stronger acids, so I chose HCl but thats apparently not the correct answer. Question from French Toast: Whic...
by Haya Rabadi 1F
Mon Jun 11, 2018 2:00 am
Forum: Hybridization
Topic: 4.95 [ENDORSED]
Replies: 1
Views: 166

4.95 [ENDORSED]

Consider the bonding in CH2=CHCHO. (a) Draw the most important Lewis structure. Include all nonzero formal charges (b) Identify the composition of the bonds and the hybridization of each lone pair- for example, by writing sigma(H1s,C2sp^2)

How do we find composition of the bonds?
by Haya Rabadi 1F
Mon Jun 11, 2018 1:44 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.75 [ENDORSED]
Replies: 1
Views: 87

4.75 [ENDORSED]

An organic compound distilled from wood was found to have a molar mass of 32.04 g/mol and the following composition by mass: 37.5% C, 12.6 % H, and 49.9% O. (a) Write the Lewis structure of the. compound and determine bond angles about the carbon and oxygen atoms (B) Give the hybridization of the ca...
by Haya Rabadi 1F
Sun Jun 10, 2018 2:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shapes to Remember for the Final
Replies: 1
Views: 91

Re: Molecular Shapes to Remember for the Final

I think its important to remember all of the molecular shapes, especially with matching the notation and the corresponding molecular shape. So, I remembered the shapes as such: AX2- linear AX3- trigonal planar AX2E- bent AXE2- linear AX4- tetrahedral AX3E- trigonal pyramidal AX2E2- bent AXE3- linear...
by Haya Rabadi 1F
Sun Jun 03, 2018 10:34 am
Forum: Hybridization
Topic: Question 4.45
Replies: 3
Views: 70

Question 4.45

Describe the structure of the formaldehyde molecule, CH2O, in terms of hybrid orbitals, bond angles, and sigma and pi bonds. The C atom is the central atom to which the other three atoms are attached. I dont quite understand sigma and pi bonds and when to use them, if someone could explain the diffe...
by Haya Rabadi 1F
Sun Jun 03, 2018 10:18 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Question 4.29 [ENDORSED]
Replies: 4
Views: 93

Question 4.29 [ENDORSED]

There are three isomers of diclorobenzene, C6H4Cl2, which differ in the relative positions of the chlorine atoms on the benzene ting. (a) Which of the three forms are polar? (b) Which has the largest dipole moment? Can someone clarify how, when given three images, can we determine if they're polar? ...
by Haya Rabadi 1F
Sun Jun 03, 2018 10:11 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Question 4.7 [ENDORSED]
Replies: 1
Views: 65

Question 4.7 [ENDORSED]

(a) What is the shape of the thionyl chloride molecule, SOCl2? Sulfur is the central atom. (b) How many different OSCl bond angles are there in this molecule? (c) What values are expected for the OSCl and ClSCl bond angles? So I understand this molecule's shape is a trigonal pyramidal and the O-S-Cl...
by Haya Rabadi 1F
Sun May 20, 2018 2:51 pm
Forum: Lewis Structures
Topic: 3.55
Replies: 6
Views: 149

3.55

Which of the following species are radicals? (a)NO2- (b) CH3 (c) OH (d)CH2O

What are radicals again? How do we determine them?
by Haya Rabadi 1F
Sun May 20, 2018 2:38 pm
Forum: Lewis Structures
Topic: 3.39
Replies: 5
Views: 197

3.39

Write the complete Lewis structure for each of the following compounds a) ammonium chloride b) potassium phosphide c) hypochlorite

I make mistakes when converting the words into equations.
by Haya Rabadi 1F
Sun May 13, 2018 6:47 pm
Forum: Trends in The Periodic Table
Topic: Q 2.67
Replies: 2
Views: 121

Q 2.67

Why for b) does it state that carbon has a higher electron affinity than nitrogen? Doesn't electron affinity increase across a period? Is this an exception to the rule?
by Haya Rabadi 1F
Sun May 13, 2018 6:43 pm
Forum: Trends in The Periodic Table
Topic: Exceptions to Ionization Energy Trend
Replies: 2
Views: 208

Exceptions to Ionization Energy Trend

So I know oxygen is an exception to the ionization energy trend. Are there other exceptions as well? Is there a guideline or criteria for what makes an element not follow the ionization energy trend?
by Haya Rabadi 1F
Sun May 13, 2018 6:41 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 3
Views: 115

Re: Covalent Bonds

Elements closer in electronegativity tend to share electrons. You can tell if they are electronegatively close if the difference in electronegativity between the two elements is less than 1.8. If the difference in electronegativity is more than 1.8, they don't share electrons, and form iconic bonds ...
by Haya Rabadi 1F
Sun May 06, 2018 11:25 am
Forum: Balancing Chemical Reactions
Topic: Test 1. Q 3
Replies: 1
Views: 135

Test 1. Q 3

How did you guys go about balancing equation?
__H3PO4 + __Ca(OH)2 ---> __Ca(H2PO4)2+ __H2O

For some reason during the test this had me stumped. Is there an easy trick to apply to these kinds of balancing equation problems?
by Haya Rabadi 1F
Sun May 06, 2018 11:18 am
Forum: Molarity, Solutions, Dilutions
Topic: Test 1. Q 2
Replies: 3
Views: 322

Test 1. Q 2

One industrial application of an electrolyte solution is electroplating of metals. In this process, an aqueous solution of metal ions is prepared and electrochemistry can be performed to deposit metal to a desired electrode surface. Suppose one is depositing nickel to an electrode surface and has pr...
by Haya Rabadi 1F
Sun May 06, 2018 11:10 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Exceptions
Replies: 2
Views: 144

Electron Configuration Exceptions

Are there more electron configuration exceptions than Cr and Cu? Which ones should we know for the midterm, if need be?
by Haya Rabadi 1F
Sun Apr 29, 2018 7:32 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question 2.47
Replies: 2
Views: 70

Question 2.47

For each of the following ground-state atoms, predict the type of orbital (1s,2p,3d,4f,etc) from which an electron will be removed to form the +1 ion: (a) GE; (b) MN; (c) Ba; (d) Au
by Haya Rabadi 1F
Sun Apr 29, 2018 7:31 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question 2.43
Replies: 1
Views: 54

Question 2.43

What is the ground-state electron configuration expected for each of the following elements: (a) silver; (b) beryllium; (c) antimony; (d) gallium; (e) tungsten; (f) iodine?
by Haya Rabadi 1F
Sun Apr 29, 2018 7:29 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question 2.41
Replies: 3
Views: 99

Question 2.41

Of the following sets of four quantum numbers(nil,ml,ms), identify the ones that are forbidden for an electron in an atom and explain why they are invalid:
(a) {4,2,-1,+1/2}; (b) {5,0,-1,+1/2}; (c) {4,4,-1,+1/2}
by Haya Rabadi 1F
Sun Apr 22, 2018 3:35 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg [ENDORSED]
Replies: 5
Views: 248

Rydberg [ENDORSED]

When would we incorporate the -R[1/n1^2 - 1/n2^2], or which problems would call for this equation?
by Haya Rabadi 1F
Sun Apr 22, 2018 3:31 pm
Forum: Properties of Light
Topic: Question 1.3 [ENDORSED]
Replies: 6
Views: 207

Question 1.3 [ENDORSED]

What does the answer choice (c) The extent of the change in the electrical field at a given point decreases mean?
by Haya Rabadi 1F
Wed Apr 18, 2018 2:40 pm
Forum: DeBroglie Equation
Topic: Measurable Wavelike Properties
Replies: 2
Views: 131

Measurable Wavelike Properties

How can you detect if something has any measurable wavelike properties? What value determines if we answer yes or no?
by Haya Rabadi 1F
Sat Apr 14, 2018 9:06 pm
Forum: Photoelectric Effect
Topic: Dividing by Avogadro's constant [ENDORSED]
Replies: 2
Views: 78

Dividing by Avogadro's constant [ENDORSED]

During Friday's lecture, Lavelle mentioned dividing by Avogadro's constant in a certain instance, but I missed it. What was he referring to?
by Haya Rabadi 1F
Sat Apr 14, 2018 9:04 pm
Forum: Balancing Chemical Reactions
Topic: How to Balance [ENDORSED]
Replies: 5
Views: 183

How to Balance [ENDORSED]

Does someone have any tips how to balance complicated chemical equations? Some of the ones on the test were not ones you could figure out the numbers for right away. So I was wondering if someone has a helpful method to solve equations like those ones.
by Haya Rabadi 1F
Sat Apr 14, 2018 9:00 pm
Forum: Properties of Light
Topic: Equations [ENDORSED]
Replies: 8
Views: 196

Equations [ENDORSED]

So when do we use the c= v x lambda equation and when do we use the E=hv equation?
by Haya Rabadi 1F
Sat Apr 14, 2018 8:56 pm
Forum: Limiting Reactant Calculations
Topic: Theoretical Yield [ENDORSED]
Replies: 6
Views: 269

Theoretical Yield [ENDORSED]

Can someone clarify how we come up with the value for theoretical yield?
by Haya Rabadi 1F
Sat Apr 14, 2018 7:12 pm
Forum: Molarity, Solutions, Dilutions
Topic: G17 [ENDORSED]
Replies: 1
Views: 61

G17 [ENDORSED]

How would you go about solving the second part in G17's problem? Determine the mass of CuSO4 5H2O that must be used to prepare 250 mL of 0.20 M CuSO4?
by Haya Rabadi 1F
Sat Apr 14, 2018 6:55 pm
Forum: Photoelectric Effect
Topic: Photoelectric effect module assessment #34B [ENDORSED]
Replies: 1
Views: 62

Re: Photoelectric effect module assessment #34B [ENDORSED]

So, I first took the minimum frequency, 1.09 x 10^15 s^-1, and multiplied it by h (Plank's constant) or 6.63 X10^-34 Js. (Since the equation is E=hv) This energy, 7.22 x 10^-19 J, is the energy needed to remove the electrons (since it says "can emit an electron") Next I found the energy of...

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