Search found 31 matches

by Sara Veerman-1H
Mon Jun 04, 2018 6:38 pm
Forum: Lewis Acids & Bases
Topic: Strength between 2 weak/strong acids/bases
Replies: 5
Views: 298

Strength between 2 weak/strong acids/bases

If given two weak acids, two strong acids, two weak bases, or two strong bases, how could you tell which one is stronger/weaker?
by Sara Veerman-1H
Mon Jun 04, 2018 6:31 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 3
Views: 132

Ligands

Can someone explain to me exactly what a ligand is? I'm confused...
by Sara Veerman-1H
Mon Jun 04, 2018 6:26 pm
Forum: Dipole Moments
Topic: dipole moments
Replies: 9
Views: 395

Re: dipole moments

I think they were probably talking about the strength. The polar bonds may not cancel if one is stronger than the other.
by Sara Veerman-1H
Mon Jun 04, 2018 6:23 pm
Forum: Properties of Light
Topic: Memorizing formulas test 2
Replies: 16
Views: 601

Re: Memorizing formulas test 2

We don't have to memorize formulas, but I do find that doing a bunch of practice problems helps with memorization (although it may not be very fun).
by Sara Veerman-1H
Mon Jun 04, 2018 6:17 pm
Forum: Lewis Acids & Bases
Topic: weak acids
Replies: 3
Views: 120

Re: weak acids

I wrote down carbonic acid (H2CO3) and benzoic acid (C6H5COOH). Apparently, when there is a carbon present the acid is weaker. In addition, compared to strong acids which dissociate completely, weak acids only dissociate ~1%.
by Sara Veerman-1H
Mon Jun 04, 2018 6:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Helpful Chart
Replies: 18
Views: 550

Re: Helpful Chart

Thank you so much!
by Sara Veerman-1H
Mon Jun 04, 2018 6:12 pm
Forum: Hybridization
Topic: Lone Pairs
Replies: 5
Views: 188

Re: Lone Pairs

I believe so because there are 4 areas of electron density
by Sara Veerman-1H
Fri May 25, 2018 12:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 10
Views: 294

Re: Bond Angle

I believe we need to know some general angles: tetrahedral - 109.5º, linear - 180º, trigonal planar - 120º (I'm not too sure if we need to know octahedral or trigonal bipyramidal). Outside of that, we probably only need to know some trends. For example, although trigonal pyramidal has a shape simila...
by Sara Veerman-1H
Fri May 25, 2018 12:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: shape of water
Replies: 8
Views: 219

Re: shape of water

I think shape is named based on the amount of bonds there are. However, the amount of lone pairs do alter the shape of the molecule. Water, because the central atom is only bonded to 2 other atoms, cannot be named trigonal pyramidal (trigonal pyramidal implies there are 3 bonds to the central atom a...
by Sara Veerman-1H
Fri May 25, 2018 12:07 pm
Forum: Ionic & Covalent Bonds
Topic: Formal charge?
Replies: 12
Views: 487

Re: Formal charge?

Formal Charge = (# of valence e-) – (# of lone pair e-) – (1/2)(# of bonded e-)
by Sara Veerman-1H
Wed May 09, 2018 4:10 pm
Forum: Properties of Light
Topic: Problem 1.69
Replies: 1
Views: 127

Re: Problem 1.69

Because we are given the work energy in eV so converting it to Joules and calculating for its frequency is helpful. We know that the laser the secret agents want to use is going to have the same or higher frequency (calculate frequency for both lasers to figure out which one should be used). After f...
by Sara Veerman-1H
Wed May 09, 2018 4:04 pm
Forum: Properties of Light
Topic: Quiz 2 Question #6
Replies: 2
Views: 135

Re: Quiz 2 Question #6

I'm not too sure how you got 4.28x10^13m, when entering this into a calculator I got 42.9m. However, in order to turn meters into nm, all you would have to do is divide it by 10^-9. Essentially, 42.9m x [1nm/(10^-9m)] = 4.29x10^10 nm. I hope this helps.
by Sara Veerman-1H
Wed May 09, 2018 3:55 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: HW Problem 2.39
Replies: 2
Views: 143

Re: HW Problem 2.39

I'm assuming we only need to know when atoms are in their ground state (and the configuration for ground state) or when they are not in their ground state.
by Sara Veerman-1H
Mon May 07, 2018 4:30 pm
Forum: Properties of Light
Topic: Test 2 Question 4
Replies: 8
Views: 285

Re: Test 2 Question 4

Lilianna, I believe the answer to this problem is 2.84x10^-19 J
by Sara Veerman-1H
Mon May 07, 2018 4:28 pm
Forum: Empirical & Molecular Formulas
Topic: Test #1 Question 7 mass percentage
Replies: 2
Views: 338

Re: Test #1 Question 7 mass percentage

Yeah, this is a tricky question because the amount of O2 that reacted was not given. First I divided both amounts of CO2 and H2O formed by their respective molar masses and found that they were equal to each other (both created 0.178 moles). Using this knowledge and the fact that O2 was present I cr...
by Sara Veerman-1H
Tue May 01, 2018 5:41 pm
Forum: Ionic & Covalent Bonds
Topic: Help on 3.9 (b) [ENDORSED]
Replies: 2
Views: 85

Re: Help on 3.9 (b) [ENDORSED]

[Ar]3d^6 would be [Ar]3d^(6)4s^(2) if it did not have a charge of 2+. [Ar]3d^(6)4s^(2) is Fe, so [Ar]3d^6 is Fe^(2+). I hope this helps.
by Sara Veerman-1H
Tue May 01, 2018 5:32 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: How detailed should the configurations be?
Replies: 3
Views: 130

Re: How detailed should the configurations be?

I think you only need to know the shorthand, but being familiar with the notation of sub-levels may come in handy later.
by Sara Veerman-1H
Mon Apr 30, 2018 4:14 pm
Forum: DeBroglie Equation
Topic: De Brogiles wavelength
Replies: 4
Views: 230

Re: De Brogiles wavelength

Yes, I think you would have to use the molar mass and convert that to kg per unit(or atom). I don't know how else a person would be able to get the mass in order to plug it into the equation λ=h/mv.
by Sara Veerman-1H
Mon Apr 30, 2018 4:10 pm
Forum: Photoelectric Effect
Topic: Test 2 final question [ENDORSED]
Replies: 15
Views: 586

Re: Test 2 final question [ENDORSED]

There is always a one-to-one ratio in the interactions between a photon and an electron, so when 1000 photons are used, 1000 electrons are emitted.
by Sara Veerman-1H
Mon Apr 30, 2018 4:05 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra
Replies: 1
Views: 111

Re: Atomic Spectra

When calculating for frequency, just make the value positive. The negative only indicates whether or not the energy is getting absorbed or emitted. It is not necessary in an equation for frequency.
by Sara Veerman-1H
Mon Apr 30, 2018 4:03 pm
Forum: Photoelectric Effect
Topic: What is work function? [ENDORSED]
Replies: 15
Views: 1754

Re: What is work function? [ENDORSED]

The Work function (threshold energy) is the energy needed to expel one electron from metal in a vacuum.
by Sara Veerman-1H
Mon Apr 30, 2018 3:57 pm
Forum: Photoelectric Effect
Topic: light problem
Replies: 2
Views: 225

Re: light problem

So right now, you have the answer in meters. Nanometers is 10^(-9) meters so you can calculate (4.32x10^-7m)x(1nm/[10^-9]m). Which would give you 432.x10^-9m or 432nm. Hope this helps.
by Sara Veerman-1H
Mon Apr 30, 2018 3:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 3d and 4s orbitals
Replies: 3
Views: 159

Re: 3d and 4s orbitals

When getting to higher energy levels, the energy levels get closer and closer together, so the 4s and 3d levels are really close. At first, the 4s level is lower than 3d (so it will fill up first), but once there are 20+ electrons, the 3d level shifts down slightly and ends up at a lower energy leve...
by Sara Veerman-1H
Sat Apr 21, 2018 4:41 pm
Forum: DeBroglie Equation
Topic: DeBrogile Module
Replies: 6
Views: 205

Re: DeBrogile Module

I believe it needs to be converted. What is the answer supposed to be?
by Sara Veerman-1H
Thu Apr 12, 2018 12:28 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Which mass of oxygen should be used? [ENDORSED]
Replies: 23
Views: 994

Re: Which mass of oxygen should be used? [ENDORSED]

Since the last digit in an answer is typically an estimate I don't believe it matters.
by Sara Veerman-1H
Thu Apr 12, 2018 12:21 pm
Forum: Molarity, Solutions, Dilutions
Topic: Units - L or mL? [ENDORSED]
Replies: 15
Views: 626

Re: Units - L or mL? [ENDORSED]

I believe it is preferred to give an answer in Liters rather than mL unless asked otherwise
by Sara Veerman-1H
Thu Apr 12, 2018 12:16 pm
Forum: SI Units, Unit Conversions
Topic: Chemistry Review Section E
Replies: 2
Views: 153

Re: Chemistry Review Section E

I think 1 mol of something = 6.022x10^23 units of that something
by Sara Veerman-1H
Fri Apr 06, 2018 4:52 pm
Forum: Limiting Reactant Calculations
Topic: Module 3: Limiting Reactant Calculations Problem 21 [ENDORSED]
Replies: 2
Views: 97

Module 3: Limiting Reactant Calculations Problem 21 [ENDORSED]

After doing this problem several times over, I never end up with any of the given answers. The problem gives 0.750 g C6H9Cl3, 1.000 kg AgNO3, and their molar masses: 187.50 g/mol and 169.88 g/mol respectively. Chemical Formula: C6H9Cl3 + 3(AgNO3) ---> AgCl + C6H9(NO3)3. I found that there are 4x10^3...
by Sara Veerman-1H
Fri Apr 06, 2018 4:33 pm
Forum: Empirical & Molecular Formulas
Topic: F.25
Replies: 2
Views: 106

Re: F.25

In the solutions manual, the answer given is C2H8N2.
by Sara Veerman-1H
Fri Apr 06, 2018 1:36 pm
Forum: Empirical & Molecular Formulas
Topic: Which mass of Hydrogen should I use?
Replies: 3
Views: 157

Re: Which mass of Hydrogen should I use?

I believe the last digit in the numerical value is an "estimate", so I don't believe you would lost points if the answer you proposed is off in the hundredths place.

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