Search found 74 matches

by Alexa Hernandez 3k
Sun Dec 08, 2019 8:26 pm
Forum: General Science Questions
Topic: Grades
Replies: 5
Views: 297

Re: Grades

See your grade on my UCLA, add the pints and then divide by 500 points...
by Alexa Hernandez 3k
Thu Dec 05, 2019 8:34 pm
Forum: Sigma & Pi Bonds
Topic: Delocalized bonnding
Replies: 2
Views: 107

Re: Delocalized bonnding

when electrons can change center
by Alexa Hernandez 3k
Tue Dec 03, 2019 9:22 pm
Forum: Polyprotic Acids & Bases
Topic: How can you tell
Replies: 11
Views: 274

Re: How can you tell

A strong acid with several hidrogens
by Alexa Hernandez 3k
Tue Dec 03, 2019 9:20 pm
Forum: Naming
Topic: Formulas
Replies: 3
Views: 44

Re: Formulas

The ligand names worksheet???
by Alexa Hernandez 3k
Tue Dec 03, 2019 9:16 pm
Forum: Conjugate Acids & Bases
Topic: 6A.1
Replies: 6
Views: 148

Re: 6A.1

Conjugate acid of a base is going to be the given base with an H+
by Alexa Hernandez 3k
Sat Nov 30, 2019 9:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Content
Replies: 14
Views: 189

Re: Final Exam Content

CUMULATIVE
by Alexa Hernandez 3k
Fri Nov 29, 2019 9:27 pm
Forum: Lewis Acids & Bases
Topic: HCl vs HF
Replies: 19
Views: 222

Re: HCl vs HF

CL IS BOTH LARGER AND LESS ELETRONEGATIVE
by Alexa Hernandez 3k
Fri Nov 29, 2019 9:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 6
Views: 104

Re: Test 2

Probably in discussions
by Alexa Hernandez 3k
Tue Nov 26, 2019 6:20 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Compound Drawings
Replies: 2
Views: 42

Re: Coordination Compound Drawings

General Lewis Structure I Believe
by Alexa Hernandez 3k
Tue Nov 26, 2019 6:19 pm
Forum: Student Social/Study Group
Topic: Grades
Replies: 18
Views: 401

Re: Grades

My UCLA
by Alexa Hernandez 3k
Tue Nov 26, 2019 6:19 pm
Forum: Biological Examples
Topic: cisplatin
Replies: 3
Views: 46

Re: cisplatin

I would assume that we need to know the basic functions and how it relates to the topic of coordination compounds
by Alexa Hernandez 3k
Thu Nov 21, 2019 11:52 am
Forum: Hybridization
Topic: Quiz 2 Hybridization Question
Replies: 4
Views: 71

Re: Quiz 2 Hybridization Question

NO... JUST UNTIL SIGMA AND PI BONDS
by Alexa Hernandez 3k
Thu Nov 21, 2019 11:48 am
Forum: Dipole Moments
Topic: Polar or nonpolar
Replies: 8
Views: 134

Re: Polar or nonpolar

O2 NONPOLAR
by Alexa Hernandez 3k
Thu Nov 21, 2019 11:47 am
Forum: Dipole Moments
Topic: Dipole Induced- Dipole Induced
Replies: 13
Views: 300

Re: Dipole Induced- Dipole Induced

It is the weakest... The same thing as referring to London Forces
by Alexa Hernandez 3k
Thu Nov 21, 2019 11:46 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle of O2
Replies: 3
Views: 36

Re: Bond Angle of O2

Because it is Linear but has a trigonal planar arrangement...
by Alexa Hernandez 3k
Sun Nov 17, 2019 2:44 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 5
Views: 78

Re: Bond Angles

You need to know the tendencies of the shape the molecule has, that can and will help a lot ...
by Alexa Hernandez 3k
Sun Nov 17, 2019 2:42 am
Forum: General Science Questions
Topic: Test 2 Review
Replies: 8
Views: 195

Re: Test 2 Review

Everything that was not included in the midterm.
by Alexa Hernandez 3k
Sun Nov 17, 2019 2:41 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Formula
Replies: 7
Views: 69

Re: VSEPR Formula

Lone pairs count as regions within the structure. Be careful because these are not the same as bonding regions and a pair is considered 1 region.
by Alexa Hernandez 3k
Sun Nov 17, 2019 2:39 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Van Der Waals Interaction
Replies: 11
Views: 107

Re: Van Der Waals Interaction

YES, ALL MOLECULE EXPERIENCE THESE FORCES...
by Alexa Hernandez 3k
Thu Nov 14, 2019 10:59 am
Forum: Administrative Questions and Class Announcements
Topic: TEST 2
Replies: 8
Views: 92

Re: TEST 2

From intermolecular forces to VSEPR Model...
by Alexa Hernandez 3k
Tue Nov 12, 2019 6:37 pm
Forum: Dipole Moments
Topic: Distinguishing Types
Replies: 1
Views: 37

Re: Distinguishing Types

Dipole-Dipole is a type of intermolecular force... The other types of intermolecular forces can be Dipole-Induced dipole, Ion-Ion, hydrogen bond...
by Alexa Hernandez 3k
Tue Nov 12, 2019 6:34 pm
Forum: Student Social/Study Group
Topic: Final Exam
Replies: 10
Views: 178

Re: Final Exam

yes...
by Alexa Hernandez 3k
Tue Nov 12, 2019 5:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 3
Views: 42

Re: Test 2

I think anything we have given until now and anything we give this week...
by Alexa Hernandez 3k
Sun Nov 10, 2019 11:10 pm
Forum: Student Social/Study Group
Topic: Midterm Average
Replies: 12
Views: 266

Re: Midterm Average

It says on the syllabus that he doesn't use curves... But it does say he take the class average before giving letter grades, so I am not sure???
by Alexa Hernandez 3k
Sun Nov 10, 2019 7:55 pm
Forum: Dipole Moments
Topic: arrows for dipole moments
Replies: 3
Views: 38

Re: arrows for dipole moments

arrows point towards the element with the higher electronegativity...
by Alexa Hernandez 3k
Sat Nov 09, 2019 2:14 pm
Forum: Bond Lengths & Energies
Topic: de Broglie threshold
Replies: 4
Views: 103

Re: de Broglie threshold

Less than 10^-15 m... That basically is referring to larger objects...
by Alexa Hernandez 3k
Sat Nov 09, 2019 12:06 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Test 2
Replies: 6
Views: 100

Re: Test 2

In the syllabus it says November 19 but it really depends on the day you take your discussion...
by Alexa Hernandez 3k
Sat Nov 09, 2019 12:04 am
Forum: Dipole Moments
Topic: Polar
Replies: 9
Views: 140

Re: Polar

PERIODIC TABLE TRENDS. MORE ELECTRONEGATIVITY DIFFERENCE SIGNIFIES MORE POLAR MOLECULE...
by Alexa Hernandez 3k
Wed Nov 06, 2019 11:08 pm
Forum: Dipole Moments
Topic: Dipole Moment Changing
Replies: 3
Views: 52

Re: Dipole Moment Changing

I believe it can vary if the molecule experiences resonance.
by Alexa Hernandez 3k
Wed Nov 06, 2019 11:06 pm
Forum: Student Social/Study Group
Topic: Class Grading
Replies: 44
Views: 2070

Re: Class Grading

Correcto!
I'm not sure how that would exactly work though...
by Alexa Hernandez 3k
Wed Nov 06, 2019 11:05 pm
Forum: Bond Lengths & Energies
Topic: Midterm
Replies: 9
Views: 142

Re: Midterm

Fingers Crossed for next week...
by Alexa Hernandez 3k
Tue Nov 05, 2019 9:57 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Sr 2+ or Rb 1+
Replies: 6
Views: 53

Re: Sr 2+ or Rb 1+

Rb has the larger Atomic Radius, Consequently Sr has a higher polarizing power.
Larger radius=more polarizability
smaller radius=more Polarizing Power...
by Alexa Hernandez 3k
Mon Nov 04, 2019 10:43 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarisability vs Polarizing Power
Replies: 15
Views: 289

Re: Polarisability vs Polarizing Power

Polarisability is an atoms ability to be polarised, this can be determined by the atom's radius. A larger atomic radius means that the atoms electrons can be more easily distorted making them easier to polarize (Consecuently they are very Polarisable). Polarazing Power is an atoms ability to polariz...
by Alexa Hernandez 3k
Mon Nov 04, 2019 10:38 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polar Covalent VS Ionic
Replies: 11
Views: 153

Re: Polar Covalent VS Ionic

Look at the electronegativity difference between the two elements.
by Alexa Hernandez 3k
Sun Nov 03, 2019 1:10 am
Forum: Ionic & Covalent Bonds
Topic: 2A.1 Part C
Replies: 3
Views: 51

Re: 2A.1 Part C

valence electrons will follow the periodic table trends. Subtract the previous noble gas # of electrons.
by Alexa Hernandez 3k
Thu Oct 31, 2019 8:18 pm
Forum: Electronegativity
Topic: What does electronegativity affect?
Replies: 2
Views: 35

Re: What does electronegativity affect?

It is the capacity of an element to attract Electrons
by Alexa Hernandez 3k
Thu Oct 31, 2019 8:17 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity Trend
Replies: 2
Views: 39

Re: Electronegativity Trend

increasing to the right side of the table
decreasing down the table
by Alexa Hernandez 3k
Tue Oct 29, 2019 12:14 pm
Forum: Ionic & Covalent Bonds
Topic: Study For midterm
Replies: 7
Views: 93

Re: Study For midterm

PRACTICE, PRACTICE, PRACTICE...
And go to the review sections...
by Alexa Hernandez 3k
Tue Oct 29, 2019 12:12 pm
Forum: Bond Lengths & Energies
Topic: bond lengths
Replies: 10
Views: 234

Re: bond lengths

The more Bonds means a stronger pull so consequently you also get a smaller length because of the increased attraction.
by Alexa Hernandez 3k
Tue Oct 29, 2019 12:10 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 10
Views: 178

Re: Midterm

Everything is on the syllabus and in the test schedule.
by Alexa Hernandez 3k
Tue Oct 29, 2019 12:08 pm
Forum: Ionic & Covalent Bonds
Topic: Polar vs Nonpolar bond strength
Replies: 2
Views: 30

Re: Polar vs Nonpolar bond strength

Yes, they are very different.
by Alexa Hernandez 3k
Sat Oct 26, 2019 8:56 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Bonds
Replies: 4
Views: 44

Re: Ionic and Covalent Bonds

It will depend on the elements you are working with and its specific qualities. You will have to pay close attention to the position they have on the periodic table and wether or not it is easier for them to share, lose or gain electrons.
by Alexa Hernandez 3k
Fri Oct 25, 2019 8:30 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations
Replies: 5
Views: 72

Re: Electron Configurations

4s is written after 3d if this level appears in the configuration. It was experimentally proven that 4s has a lower energy level then 3d
by Alexa Hernandez 3k
Fri Oct 25, 2019 1:12 am
Forum: Ionic & Covalent Bonds
Topic: Threshold Energy
Replies: 4
Views: 62

Re: Threshold Energy

It can be calculated. It it the minimum requirement of energy in order to achieve the ejection of an electron.
by Alexa Hernandez 3k
Fri Oct 25, 2019 1:09 am
Forum: Student Social/Study Group
Topic: Midterm
Replies: 17
Views: 275

Re: Midterm

My TA said it was unlikely but Lavelle is the one making the test so I would ask just to be on the safe side.
by Alexa Hernandez 3k
Mon Oct 21, 2019 8:17 pm
Forum: Photoelectric Effect
Topic: Intensity of Light
Replies: 4
Views: 69

Re: Intensity of Light

Increasing the intensity increases the overall number of photons. In order to eject a single electron you need enough energy within a single photon.
by Alexa Hernandez 3k
Sat Oct 19, 2019 2:42 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer vs. Lyman Series
Replies: 4
Views: 68

Re: Balmer vs. Lyman Series

Balmer was in the visible region while Lyman was in the UV region of the spectrum. Each has a different quantum number because the energy levels are different...
by Alexa Hernandez 3k
Sat Oct 19, 2019 2:39 pm
Forum: Photoelectric Effect
Topic: One photon one atom interaction
Replies: 14
Views: 209

Re: One photon one atom interaction

If the individual photon has already passed the energy threshold then theoretically the number of photons overall should equal the amount of ejected electrons.
by Alexa Hernandez 3k
Sat Oct 19, 2019 2:33 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Inner e- and Outer e-
Replies: 14
Views: 132

Re: Inner e- and Outer e-

The inner e- are going to act as a type of shield for the outer e-. Like the Teacher said in class: It is like when a person stand in-between you and a fire. You will not feel the same amount of heat as if you were directly in front of the fire source yourself. The outer electrons have attraction to...
by Alexa Hernandez 3k
Wed Oct 16, 2019 1:52 pm
Forum: General Science Questions
Topic: Salt Water: Mixture or Compound?
Replies: 4
Views: 88

Re: Salt Water: Mixture or Compound?

Mixture... They don't change each others main chemical components when they mix and they can be separated physically
by Alexa Hernandez 3k
Wed Oct 16, 2019 1:51 pm
Forum: Properties of Electrons
Topic: Orbitals and Lobes
Replies: 3
Views: 56

Re: Orbitals and Lobes

I believe orbitals is the overall mathematical function while lobe refers to a more specific part within the orbital.
by Alexa Hernandez 3k
Wed Oct 16, 2019 1:48 pm
Forum: Properties of Light
Topic: Constant for Speed of Light
Replies: 14
Views: 199

Re: Constant for Speed of Light

I think 2.998x10^8 is more accurate but definitely ask if your not positive.
by Alexa Hernandez 3k
Sun Oct 13, 2019 12:00 am
Forum: Properties of Light
Topic: Frequency vs. Wavelength
Replies: 15
Views: 186

Re: Frequency vs. Wavelength

They have an inverse relationship. The more frequency of waves you have, the less length to each wave you will get
by Alexa Hernandez 3k
Sat Oct 12, 2019 11:57 pm
Forum: Properties of Light
Topic: wavelike properties
Replies: 6
Views: 65

Re: wavelike properties

It is less about needing and more about it just having wave-like Properties.
by Alexa Hernandez 3k
Sat Oct 12, 2019 12:25 pm
Forum: Significant Figures
Topic: Balancing Equations
Replies: 4
Views: 188

Re: Balancing Equations

Take in element by element and make sure you have the same number on both sides.
Mainly trust yourself and keep calm... That is essential.
by Alexa Hernandez 3k
Fri Oct 11, 2019 2:23 pm
Forum: Student Social/Study Group
Topic: Best Sessions
Replies: 12
Views: 178

Re: Best Sessions

I personally find it best to do all the homework exercises because that way you get a taste of everything.
by Alexa Hernandez 3k
Fri Oct 11, 2019 12:06 am
Forum: Limiting Reactant Calculations
Topic: Can't Find Limiting Reactant
Replies: 4
Views: 233

Re: Can't Find Limiting Reactant

Make sure to balance first
It is a common mistake people make and a lot of teachers put it in like that in test in order to trick you.
by Alexa Hernandez 3k
Fri Oct 11, 2019 12:03 am
Forum: Significant Figures
Topic: Question About Significant Figures and Rounding
Replies: 22
Views: 1082

Re: Question About Significant Figures and Rounding

Only round for the final result. If not your final number will be slightly different.
For multiplication and division you go with the number with the least Sig. figures
For adding or subtracting use the number with the least amount of decimal points...
by Alexa Hernandez 3k
Fri Oct 11, 2019 12:00 am
Forum: Molarity, Solutions, Dilutions
Topic: Homework L7
Replies: 4
Views: 294

Re: Homework L7

Turn the mass I’m that is given into moles by dividing by the molar mass of the molecule it is asking.

Use a molar ratio to go from the first molecule to the desired one

Multiply that molecule by its molar mass in order to cancel out the moles and get just the mass!!!
by Alexa Hernandez 3k
Tue Oct 08, 2019 9:18 pm
Forum: Properties of Light
Topic: Intensity and the number of photons
Replies: 3
Views: 1086

Re: Intensity and the number of photons

Increasing light intensity will increase the number of photons, but that will not increase the amount of energy per individual photons. That means that changing the intensity does little in relation to the photoelectric effect.
by Alexa Hernandez 3k
Sun Oct 06, 2019 6:37 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Reactions
Replies: 25
Views: 650

Re: Balancing Reactions

Law of Conservation of Mass

MASS IS NOT CREATED NOR DESTROYED, IT IS TRANSFORMED. Consecuently, you need to maintain the same amount of mass at the end the reaction.
by Alexa Hernandez 3k
Sun Oct 06, 2019 6:34 pm
Forum: Student Social/Study Group
Topic: Turning in Extra HW problems
Replies: 10
Views: 211

Re: Turning in Extra HW problems

I would ask your TA directly... Either way you don't lose anything with being extra prepared!!!
by Alexa Hernandez 3k
Sat Oct 05, 2019 2:48 pm
Forum: Molarity, Solutions, Dilutions
Topic: Converting Before or After?
Replies: 10
Views: 153

Re: Converting Before or After?

IF EVERYTHING IS GOING WELL THE DESIRED UNITS SHOULD PERFECTLY CANCEL OUT... IF NOT YOU HAVE A BIT OF A PROBLEM...
by Alexa Hernandez 3k
Thu Oct 03, 2019 9:46 pm
Forum: Significant Figures
Topic: Sig Figs on the Test
Replies: 3
Views: 72

Re: Sig Figs on the Test

For values of elements you cannot simplify. No significant figures, just use the number on the periodic table.
by Alexa Hernandez 3k
Thu Oct 03, 2019 9:45 pm
Forum: Limiting Reactant Calculations
Topic: Basic Question
Replies: 11
Views: 168

Re: Basic Question

EXTREMELY unlikely ...
by Alexa Hernandez 3k
Sun Sep 29, 2019 9:26 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.15, what is a sulfide of a metal?
Replies: 3
Views: 51

Re: E.15, what is a sulfide of a metal?

74.10gxmol-1 - 34.02gxmol-1
40.08gxmol-1 (Ca) + 32.06 gxmol-1 (S)

= 72.14gxmol-1
by Alexa Hernandez 3k
Sun Sep 29, 2019 8:35 pm
Forum: Significant Figures
Topic: Rounding the elements
Replies: 12
Views: 173

Re: Rounding the elements

When it comes to numbers directly from the periodic table y would recommend not rounding. Use the exact number.
by Alexa Hernandez 3k
Sun Sep 29, 2019 8:33 pm
Forum: Significant Figures
Topic: Question About Significant Figures and Rounding
Replies: 22
Views: 1082

Re: Question About Significant Figures and Rounding

It depends on how you obtained that number. If you used division or multiplication, then the number of significant figures will be determined by the original number with the least amount of significant figures. For Example: 2.5 x 3.42 , 2.5 has the smallest amount of sig. figures with only 2 (you wi...
by Alexa Hernandez 3k
Sun Sep 29, 2019 2:30 pm
Forum: Significant Figures
Topic: Basic sig fig question
Replies: 6
Views: 329

Re: Basic sig fig question

Try to always leave it for the final result.
by Alexa Hernandez 3k
Sun Sep 29, 2019 2:25 pm
Forum: Significant Figures
Topic: Significant figures clarification
Replies: 3
Views: 91

Re: Significant figures clarification

It depends on how you obtained that number. If you used division or multiplication, then the number of significant figures will be determined by the original number with the least amount of significant figures. For Example: 2.5 x 3.42 , 2.5 has the smallest amount of sig. figures with only 2 (you wi...

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