Search found 98 matches

by Inderpal Singh 2L
Sat Jan 16, 2021 9:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE table and Molarity units
Replies: 16
Views: 34

Re: ICE table and Molarity units

I personally convert everything to mol/L to simplify and organize the whole process better!
by Inderpal Singh 2L
Sat Jan 16, 2021 9:05 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: H2O as a Gas
Replies: 53
Views: 374

Re: H2O as a Gas

Make sure to include H2O if it is a gas!
by Inderpal Singh 2L
Sat Jan 16, 2021 3:24 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Molecular phases
Replies: 6
Views: 17

Re: Molecular phases

We don't include water because it is available in such a large amount that very little is being put to use. Therefore, it is considered a constant and allows for water to be canceled out in the equation.
by Inderpal Singh 2L
Sat Jan 16, 2021 3:22 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Box
Replies: 28
Views: 71

Re: ICE Box

You usually wouldn't need to use an ICE box for strong acids/bases. However, I believe that there is no harm in doing so.
by Inderpal Singh 2L
Wed Jan 13, 2021 2:33 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Kw
Replies: 8
Views: 56

Re: Kw

Since water does not ionize completely, it is considered both a weak acid and base.

If you would like a more in-depth description:

http://chemed.chem.purdue.edu/genchem/t ... nd%20bases.
by Inderpal Singh 2L
Wed Jan 13, 2021 2:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: lecture 5 question
Replies: 13
Views: 54

Re: lecture 5 question

I think you should have most of them memorized. However, when you do enough practice with these types of problems, they become increasingly easier to identify I've found!
by Inderpal Singh 2L
Mon Jan 11, 2021 2:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw
Replies: 9
Views: 48

Re: Kw

I am pretty sure that they don't always have to be equal, and sometimes the [H30+] will be larger than [OH-] making it acidic, and the [OH-] can be larger than [H30+] making it basic. However, the Kw will always be equal to 10^-14.
by Inderpal Singh 2L
Mon Jan 11, 2021 2:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw in Lecture
Replies: 5
Views: 36

Re: Kw in Lecture

Kw is the equilibrium constant for [H30+][OH-], not the equilibrium constant for the Ba equation.
by Inderpal Singh 2L
Sat Jan 09, 2021 1:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs. Q
Replies: 53
Views: 159

Re: K vs. Q

Yes! Q is when the reaction is not at equilibrium.
by Inderpal Singh 2L
Fri Jan 08, 2021 2:37 pm
Forum: Ideal Gases
Topic: Ideal vs real gases
Replies: 12
Views: 57

Re: Ideal vs real gases

Dr. Lavelle said that for this class we should assume that the gases given are ideal :) in reality, I don't think there are many ideal gases. Heres a website with some more info if ur curious: https://www.khanacademy.org/science/physics/thermodynamics/temp-kinetic-theory-ideal-gas-law/a/what-is-the-...
by Inderpal Singh 2L
Fri Jan 08, 2021 2:33 pm
Forum: Ideal Gases
Topic: PV=nRT and concentration
Replies: 27
Views: 100

Re: PV=nRT and concentration

Molarity = mol/L
And n, in this case, represents mol
V would be liters(L)
by Inderpal Singh 2L
Wed Jan 06, 2021 1:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reverse Reactions
Replies: 12
Views: 45

Re: Reverse Reactions

You are essentially "flipping" the reactants and products of the forward reaction, and when you would "plug" this into the equation, you would end up with the reciprocal of the forward reaction. This applies in the other direction as well.
by Inderpal Singh 2L
Wed Jan 06, 2021 1:38 pm
Forum: Ideal Gases
Topic: Units of Temperature
Replies: 82
Views: 284

Re: Units of Temperature

We have to use Kelvin, but we will have the conversion equation on the equation sheet I believe in case we are given celsius.
by Inderpal Singh 2L
Mon Jan 04, 2021 8:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant
Replies: 8
Views: 51

Re: Equilibrium Constant

It K is less than one, it is favoring the reactants.
by Inderpal Singh 2L
Tue Dec 15, 2020 2:36 pm
Forum: Industrial Examples
Topic: Chemotherapy
Replies: 18
Views: 380

Re: Chemotherapy

Why do cisplatin and transplatin behave differently?
by Inderpal Singh 2L
Tue Dec 15, 2020 2:35 pm
Forum: Lewis Acids & Bases
Topic: Strong Lewis Bases?
Replies: 3
Views: 12

Strong Lewis Bases?

What are the common characteristics of a strong versus weak Lewis base?
by Inderpal Singh 2L
Fri Dec 11, 2020 10:29 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How to identify polydentates
Replies: 2
Views: 13

Re: How to identify polydentates

The biggest tip I can give you is to draw the lewis structures. It becomes much easier to identify if a compound if polydentate or not.
by Inderpal Singh 2L
Fri Dec 11, 2020 10:28 pm
Forum: Amphoteric Compounds
Topic: Metalloid Line
Replies: 2
Views: 17

Metalloid Line

In one of the lectures, an "amphoteric line" was shown which was very similar to the metalloid line, are these all the possible amphoteric compounds or are their more than just these?
by Inderpal Singh 2L
Fri Dec 11, 2020 10:26 pm
Forum: Bronsted Acids & Bases
Topic: Acid and Base Identification
Replies: 3
Views: 23

Re: Acid and Base Identification

This is a super simple diagram, but it may help clear some minor details up:

https://lh3.googleusercontent.com/proxy ... gXwGPHRmvQ
by Inderpal Singh 2L
Fri Dec 11, 2020 10:24 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Ph and PKA
Replies: 7
Views: 73

Re: Ph and PKA

HA is the acid and A- is the base!
by Inderpal Singh 2L
Thu Dec 10, 2020 2:30 am
Forum: Determining Molecular Shape (VSEPR)
Topic: wedge and dash
Replies: 14
Views: 96

Re: wedge and dash

Wedge = to you
Dash = away from u

This helps visualize it.
by Inderpal Singh 2L
Thu Dec 10, 2020 2:27 am
Forum: Naming
Topic: Naming quizlet
Replies: 41
Views: 261

Re: Naming quizlet

This is a life saver! Thank you.
by Inderpal Singh 2L
Tue Dec 08, 2020 2:19 pm
Forum: Lewis Acids & Bases
Topic: J.5 part c
Replies: 2
Views: 20

Re: J.5 part c

I saw this too and I am not sure either.
by Inderpal Singh 2L
Mon Dec 07, 2020 3:27 pm
Forum: Lewis Acids & Bases
Topic: Calculations for Acids and Bases
Replies: 5
Views: 38

Re: Calculations for Acids and Bases

I don't think so!
by Inderpal Singh 2L
Mon Dec 07, 2020 3:27 pm
Forum: Industrial Examples
Topic: Bond rotations
Replies: 7
Views: 149

Re: Bond rotations

I don't believe that resonant bonds can rotate.
by Inderpal Singh 2L
Mon Dec 07, 2020 1:48 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Common Ligands
Replies: 3
Views: 41

Re: Common Ligands

I believe we will need to know a decent amount of it.
by Inderpal Singh 2L
Fri Dec 04, 2020 3:10 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Sigma and Pi Bonds
Replies: 31
Views: 393

Re: Sigma and Pi Bonds

I believe the order does not matter.
by Inderpal Singh 2L
Fri Dec 04, 2020 3:08 am
Forum: Hybridization
Topic: Difference between hybrid orbitals and hybridization
Replies: 5
Views: 689

Re: Difference between hybrid orbitals and hybridization

^What is a hybridization scheme?
by Inderpal Singh 2L
Wed Dec 02, 2020 1:25 pm
Forum: Hybridization
Topic: Pi Bonds Cannot Rotate
Replies: 23
Views: 158

Pi Bonds Cannot Rotate

Why can Pi Bonds not Rotate? I cannot visualize it properly.
by Inderpal Singh 2L
Wed Dec 02, 2020 1:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Type of Bond from Shape
Replies: 12
Views: 37

Re: Determining Type of Bond from Shape

Make sure you always draw out the Lewis Structure!
by Inderpal Singh 2L
Mon Nov 30, 2020 11:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Differences in Bond Angles with Same VSEPR Formula?
Replies: 4
Views: 53

Re: Differences in Bond Angles with Same VSEPR Formula?

I believe if the electronegativity of the central atom decreases, so will the bond angle.
by Inderpal Singh 2L
Mon Nov 30, 2020 12:39 pm
Forum: Hybridization
Topic: Pi Bonds break
Replies: 8
Views: 67

Re: Pi Bonds break

I do not believe there would be any exceptions to this, however, I would seek further clarification.
by Inderpal Singh 2L
Fri Nov 27, 2020 12:12 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Chart
Replies: 18
Views: 104

Re: VSEPR Chart

I think we will have to memorize it but with enough practice, some of them should become very apparent to us.
by Inderpal Singh 2L
Thu Nov 26, 2020 2:19 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Atom Angles
Replies: 3
Views: 47

Re: Atom Angles

These links may help provide some insight :) : https://www.dartmouth.edu/~genchem/0102/spring/6winn/VSEPR2.html#:~:text=The%20bond%20length%20is%20determined,apart%20the%20ligands%20themselves%20are. https://physics.stackexchange.com/questions/215405/how-are-bond-angles-determined#:~:text=The%20posi...
by Inderpal Singh 2L
Thu Nov 26, 2020 2:17 am
Forum: Determining Molecular Shape (VSEPR)
Topic: What does delocalized π bond mean?
Replies: 18
Views: 134

Re: What does delocalized π bond mean?

I believe resonance means there are delocalized pi bonds.
by Inderpal Singh 2L
Wed Nov 25, 2020 1:42 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Reason why lone pairs decrease bond angle
Replies: 7
Views: 45

Re: Reason why lone pairs decrease bond angle

Lone pairs actually have the highest repulsion, meaning they push the bonds farther away compared to if they were not lone pairs. This causes the bond angles to decrease.
by Inderpal Singh 2L
Tue Nov 24, 2020 12:12 pm
Forum: Hybridization
Topic: Hybridization Clarification
Replies: 9
Views: 61

Re: Hybridization Clarification

Essentially, you mix together orbitals to create a new orbital that is better suited to form chemical bonds. This is a really good video :) :

https://www.organicchemistrytutor.com/hybridization/
by Inderpal Singh 2L
Tue Nov 24, 2020 12:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: memorization
Replies: 12
Views: 114

Re: memorization

I used flashcards and drew out the structures myself multiple times.
by Inderpal Singh 2L
Mon Nov 23, 2020 2:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: H20 Bent Structure
Replies: 14
Views: 107

Re: H20 Bent Structure

The two lone pairs repel each other, making them move away!
by Inderpal Singh 2L
Mon Nov 23, 2020 2:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angle tips
Replies: 10
Views: 64

Re: bond angle tips

The best bet would probably to use flashcards. I would also look at some YouTube videos, their might be some nice tips and tricks.
by Inderpal Singh 2L
Sat Nov 21, 2020 3:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Which shapes to memorize
Replies: 11
Views: 133

Re: Which shapes to memorize

Would we have to memorize the bond angles as well?
by Inderpal Singh 2L
Sat Nov 21, 2020 3:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Stable Structures
Replies: 10
Views: 65

Re: Stable Structures

The more stable the better :)
by Inderpal Singh 2L
Fri Nov 20, 2020 1:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR notation
Replies: 9
Views: 31

Re: VSEPR notation

I believe that it can
by Inderpal Singh 2L
Thu Nov 19, 2020 10:04 am
Forum: Electronegativity
Topic: Most Electronegative Element
Replies: 5
Views: 53

Most Electronegative Element

Why is Flourine considered the most electronegative element and not Helium? I know that the trend increases from bottom left to top right, so I was curious.
by Inderpal Singh 2L
Wed Nov 18, 2020 1:23 pm
Forum: Ionic & Covalent Bonds
Topic: Disassociation energy
Replies: 3
Views: 32

Re: Disassociation energy

I have already read that ionic bonds are stronger than covalent. I am not sure if their are exceptions.
by Inderpal Singh 2L
Tue Nov 17, 2020 3:37 pm
Forum: Bond Lengths & Energies
Topic: Higher Melting Point
Replies: 27
Views: 211

Re: Higher Melting Point

CHI3 has a higher melting point because it is bigger.
by Inderpal Singh 2L
Sun Nov 15, 2020 5:56 pm
Forum: Bond Lengths & Energies
Topic: Hydrogen Bonding
Replies: 13
Views: 68

Hydrogen Bonding

Will there ever be exceptions to the rule that H-bonding only occurs between H and N, O, or F?
by Inderpal Singh 2L
Sun Nov 15, 2020 11:34 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.21 (omit c)
Replies: 3
Views: 34

1E.21 (omit c)

How many unpaired electrons are predicted for the ground-state configuration of each of the following atoms: (a) Bi; (b) Si; (c) Ta; (d) Ni?

Please help :)
by Inderpal Singh 2L
Thu Nov 12, 2020 1:32 am
Forum: Ionic & Covalent Bonds
Topic: distinguishing bonds
Replies: 2
Views: 13

Re: distinguishing bonds

Covalent bonds are usually formed between two nonmetals while ionic bonds are between a metal and nonmetal. Ionic bonds are also considered to be stronger than covalent bonds, due to the attraction between positives and negatives.
by Inderpal Singh 2L
Wed Nov 11, 2020 1:22 pm
Forum: Bond Lengths & Energies
Topic: Quadruple Bond
Replies: 2
Views: 22

Quadruple Bond

Is there a such thing as a quadruple bond by chance? So far I have only heard of single, double, and triple bonds. Even if we won't be reviewing it in this class, will be ever come across a quadruple bond in chemistry?
by Inderpal Singh 2L
Tue Nov 10, 2020 11:32 am
Forum: Ionic & Covalent Bonds
Topic: delta + or -
Replies: 12
Views: 71

Re: delta + or -

You would base it off the one that has the higher electronegativity! Also, remember that induced dipole moments can cause compounds such as N2 to have one nitrogen slightly more electronegative than the other.
by Inderpal Singh 2L
Mon Nov 09, 2020 10:13 am
Forum: Ionic & Covalent Bonds
Topic: Sulfate
Replies: 8
Views: 29

Re: Sulfate

As far as I know, it is because sulfate has d-orbitals. However, I am also still confused on why it is allowed an expanded octet. However, I think it may have something to do with the post being directly above mine ^ (-2,-1,0,1,2)
by Inderpal Singh 2L
Sun Nov 08, 2020 3:20 am
Forum: Resonance Structures
Topic: Valence Electrons [ENDORSED]
Replies: 43
Views: 248

Valence Electrons [ENDORSED]

How does the professor calculate the number of valence electrons in an element so quickly? Does it have something to do with its position in a column of the periodic table? (Oxygen has 6 VE)
by Inderpal Singh 2L
Fri Nov 06, 2020 2:56 am
Forum: Ionic & Covalent Bonds
Topic: Size of Bonds
Replies: 28
Views: 99

Re: Size of Bonds

Double bonds have a higher number of electrons than single bonds, therefore being pulled closer to the nucleus of the atom. The nucleus of the atom is positively charged while the electrons are negative, opposites attract :)
by Inderpal Singh 2L
Fri Nov 06, 2020 2:54 am
Forum: Octet Exceptions
Topic: Group 13 Elements
Replies: 13
Views: 120

Re: Group 13 Elements

I agree with everyone else that group 13 elements do not require an octet.
by Inderpal Singh 2L
Thu Nov 05, 2020 1:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 1 Review
Replies: 7
Views: 56

Re: Midterm 1 Review

I also agree, I would like to go over what I got wrong and right, or else I will never know what to improve on.
by Inderpal Singh 2L
Tue Nov 03, 2020 5:47 pm
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 22
Views: 349

Re: Bond Length

Triple bonds are the strongest bond so they would indeed require more energy than single and double bonds to break.
by Inderpal Singh 2L
Tue Nov 03, 2020 5:46 pm
Forum: Trends in The Periodic Table
Topic: Inert-pair effect
Replies: 4
Views: 43

Re: Inert-pair effect

I am also unaware of this effect. It would be nice if someone could explain it :)
by Inderpal Singh 2L
Tue Nov 03, 2020 5:44 pm
Forum: Electronegativity
Topic: Periodic Table Trend
Replies: 37
Views: 387

Re: Periodic Table Trend

Increase across a period and decrease down a group :)
by Inderpal Singh 2L
Tue Nov 03, 2020 5:43 pm
Forum: Trends in The Periodic Table
Topic: Easy Way to Remember Trends
Replies: 5
Views: 97

Easy Way to Remember Trends

Does anyone know an acronym for remembering periodic trends? For instance, for the different wavelengths, there was Rauls Mother is Visiting Uncle Xaviers Garden. (Radio, Microwave, Infrared, Visible, UV, X-ray, Gamma).
by Inderpal Singh 2L
Tue Nov 03, 2020 12:53 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 11
Views: 333

Re: Formal Charge

You would get 1- for this.
by Inderpal Singh 2L
Tue Nov 03, 2020 12:48 am
Forum: Trends in The Periodic Table
Topic: # of electrons
Replies: 23
Views: 118

Re: # of electrons

Equivalent to it's atomic number.
by Inderpal Singh 2L
Mon Nov 02, 2020 9:02 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Noble Gas Configuration
Replies: 13
Views: 75

Re: Noble Gas Configuration

I would stick to the previous noble gas or just writing out the whole configuration to be safe.
by Inderpal Singh 2L
Mon Nov 02, 2020 9:01 pm
Forum: Trends in The Periodic Table
Topic: Sizes of ions vs elements
Replies: 4
Views: 37

Re: Sizes of ions vs elements

Na is to the left side of Cl on the periodic table. By making Na into Na+, you are losing an electron. Since the outermost electron was in the 3 state, by taking it away, the radius drops down to the 2 state/shell. Na was normally larger than Cl but by making it into an ion, it got smaller.
by Inderpal Singh 2L
Thu Oct 29, 2020 6:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 1
Replies: 2
Views: 32

Midterm 1

Hello, if a midterm question had an error in the actual question or answers, how would these be graded? One of my midterm questions had two of the same answers and it made me curious. Thank youuu
by Inderpal Singh 2L
Wed Oct 28, 2020 3:34 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Sapling Question
Replies: 4
Views: 75

Sapling Question

How many electrons in an atom could have these sets of quantum numbers?
n=3
n=5,ℓ=0
n=6,ℓ=2,mℓ=−1

Can someone explain how this is done/how to start it? I am very confused about orbitals and quantum numbers at the moment.
by Inderpal Singh 2L
Tue Oct 27, 2020 3:46 pm
Forum: DeBroglie Equation
Topic: Sapling Week 2-4 HW Question 24
Replies: 11
Views: 127

Re: Sapling Week 2-4 HW Question 24

They have to be "uniform" throughout the whole wave. (same length wavelengths and amplitude). They also have to end where the beginning of the wave begins. Visualize it as putting multiple of these waves together, would they fit together like a puzzle piece? This was very hard to describe ...
by Inderpal Singh 2L
Mon Oct 26, 2020 11:04 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Units for Heisenberg Indeterminacy Equation
Replies: 6
Views: 45

Re: Units for Heisenberg Indeterminacy Equation

Yes, I believe they are the same thing. Use kg for mass and m/s for velocity. Make sure to convert if not! :)
by Inderpal Singh 2L
Mon Oct 26, 2020 11:02 am
Forum: Properties of Light
Topic: Is c always the speed of light?
Replies: 88
Views: 457

Re: Is c always the speed of light?

C will be equal to 3*10^8.
by Inderpal Singh 2L
Fri Oct 23, 2020 3:45 pm
Forum: Photoelectric Effect
Topic: Application
Replies: 5
Views: 44

Re: Application

I believe that it only does apply to metal surfaces :) but I would double-check.
by Inderpal Singh 2L
Fri Oct 23, 2020 3:43 pm
Forum: Significant Figures
Topic: Quick Sig Fig Question with Addition/Subtraction
Replies: 7
Views: 90

Re: Quick Sig Fig Question with Addition/Subtraction

I've always rounded at the end. This is what my teacher in high school did as well.
by Inderpal Singh 2L
Wed Oct 21, 2020 11:13 pm
Forum: Properties of Light
Topic: Wavelengths in Light Spectrum
Replies: 9
Views: 78

Re: Wavelengths in Light Spectrum

I am personally going to familiarize myself with the spectrum. I feel like it will come in handy after the midterm as well :)
by Inderpal Singh 2L
Wed Oct 21, 2020 1:20 pm
Forum: Properties of Light
Topic: Electrons Emitted
Replies: 7
Views: 45

Re: Electrons Emitted

I had trouble with this as well, all you have to do is divide the total energy by the work function. Take into account what the problem might have already given you.
by Inderpal Singh 2L
Wed Oct 21, 2020 1:18 pm
Forum: Balancing Chemical Reactions
Topic: H7
Replies: 4
Views: 54

Re: H7

I personally am going to memorize a few of the common ones. However, I think it is best to check with the professor or TA just in case to make sure.
by Inderpal Singh 2L
Wed Oct 21, 2020 1:17 pm
Forum: Significant Figures
Topic: How would you round these numbers
Replies: 10
Views: 118

Re: How would you round these numbers

8.0 and 5.0. Remember that any zero's at the end of a number after a decimal point count as a significant figure :)
by Inderpal Singh 2L
Wed Oct 21, 2020 1:11 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Applied to particles other than electrons
Replies: 5
Views: 23

Re: Applied to particles other than electrons

The equation applies to protons and neutrons as well I believe. Pretty much anything that is super small on a subatomic scale I believe.
by Inderpal Singh 2L
Tue Oct 20, 2020 10:01 am
Forum: Photoelectric Effect
Topic: Constants and Equations
Replies: 5
Views: 27

Re: Constants and Equations

I think Dr. Lavelle also mentioned in the lectures multiple times that we would not have to memorize any constants or equations. So I think we should focus more on the conceptual aspect of the material rather than actually memorizing anything.
by Inderpal Singh 2L
Mon Oct 19, 2020 1:08 pm
Forum: DeBroglie Equation
Topic: E=pc Equation
Replies: 3
Views: 39

Re: E=pc Equation

He was trying to show all the other equations you could derive from E=m*c^2. This is similar to the equations we used in the photoelectric effect and how we would use what is given to us to answer a problem. Depending on what we are given, we can form different types of equations.
by Inderpal Singh 2L
Mon Oct 19, 2020 1:02 pm
Forum: Properties of Light
Topic: Lecture 7
Replies: 5
Views: 23

Re: Lecture 7

I believe you cannot see wavelengths that are smaller than about 10^-15 m.
by Inderpal Singh 2L
Mon Oct 19, 2020 12:59 pm
Forum: Photoelectric Effect
Topic: What is equation is this ?
Replies: 11
Views: 75

Re: What is equation is this ?

This is the equation for the speed of light. It is used a lot in the equations revolving around the photoelectric effect :)
by Inderpal Singh 2L
Fri Oct 16, 2020 1:43 pm
Forum: Photoelectric Effect
Topic: Sapling HW #4 Part 2 Photoelectric
Replies: 3
Views: 28

Sapling HW #4 Part 2 Photoelectric

When a metal was exposed to photons at a frequency of 1.40×1015 s−1, electrons were emitted with a maximum kinetic energy of 3.30×10−19 J. Calculate the work function, Φ, of this metal. Φ =5.97×10^−19 J/photon What is the maximum number of electrons that could be ejected from this metal by a burst o...
by Inderpal Singh 2L
Thu Oct 15, 2020 12:23 pm
Forum: Einstein Equation
Topic: Planck's Number
Replies: 6
Views: 108

Planck's Number

Can someone explain where h (Plancks constant) comes from? I want to have a better understanding of why it is in the equation :)
by Inderpal Singh 2L
Thu Oct 15, 2020 12:21 pm
Forum: Photoelectric Effect
Topic: Amplitude and Intensity
Replies: 6
Views: 64

Re: Amplitude and Intensity

Yes. When the amplitude increases, so does the number of photons.
by Inderpal Singh 2L
Wed Oct 14, 2020 12:23 pm
Forum: Properties of Light
Topic: Memorization of Increasing Energy
Replies: 4
Views: 57

Memorization of Increasing Energy

Do we need to memorize the order of electromagnetic radiation in order of increasing energy?

Like placing the following in order: γ-rays, visible light, ultraviolet radiation, microwaves, x-rays.
by Inderpal Singh 2L
Mon Oct 12, 2020 2:34 pm
Forum: Properties of Light
Topic: Light Intensity
Replies: 7
Views: 54

Re: Light Intensity

Yes, that is correct. Since the interaction between photons and electrons is one on one, increasing the intensity will not affect whether or not the electrons would be ejected as only the number of photons is increased. In order for electrons to be ejected, it depends on the energy of the individual...
by Inderpal Singh 2L
Sun Oct 11, 2020 8:53 pm
Forum: Limiting Reactant Calculations
Topic: Double Check my Understanding
Replies: 10
Views: 138

Re: Double Check my Understanding

Yup, you are good. The stoichiometric coefficients are just there to create a balance between the two sides and don't actually go into the calculation.
by Inderpal Singh 2L
Sat Oct 10, 2020 3:17 pm
Forum: Empirical & Molecular Formulas
Topic: Calculating Atomic Mass of a Molecule
Replies: 9
Views: 58

Re: Calculating Atomic Mass of a Molecule

I personally use the exact values provided on the periodic table and do not round until the very end of the problem. A scientific calculator should save all of your decimal points and use it later.
by Inderpal Singh 2L
Fri Oct 09, 2020 10:55 am
Forum: Significant Figures
Topic: Which number determines sig figs of the answer?
Replies: 26
Views: 179

Re: Which number determines sig figs of the answer?

Based on what I learned from my chem teacher in highschool, we usually just went with the smallest number given to us in the actual problem.
by Inderpal Singh 2L
Wed Oct 07, 2020 5:16 pm
Forum: Empirical & Molecular Formulas
Topic: Outline 1 Question L39
Replies: 3
Views: 33

Outline 1 Question L39

A 1.50-g sample of metallic tin was placed in a 26.45-g crucible and heated until all the tin had reacted with the oxygen in air to form an oxide. The crucible and product together were found to weigh 28.35 g. (a) What is the empirical formula of the oxide? (b) Write the name of the oxide. Can someo...
by Inderpal Singh 2L
Tue Oct 06, 2020 4:28 pm
Forum: Balancing Chemical Reactions
Topic: Combustion
Replies: 14
Views: 189

Re: Combustion

I believe he was trying to make a point that not only do combustion, burning and oxidation have to do with the addition of O2 gas but that these types of reactions are exothermic. Exothermic means that the reaction is releasing energy.
by Inderpal Singh 2L
Tue Oct 06, 2020 12:35 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 11
Views: 118

Re: Sig Figs

If significant numbers are an issue for anyone, I studied the topic using mainly this image:

https://getstartedinscience.weebly.com/ ... orig.jpg?1

I think it really sums up everything simply and clearly :)
by Inderpal Singh 2L
Tue Oct 06, 2020 12:33 pm
Forum: Significant Figures
Topic: Sig Figs for Molar Mass
Replies: 14
Views: 115

Re: Sig Figs for Molar Mass

Similar to the other responses above, I use the largest amount of numbers to increase my accuracy. But then I would round down to the smallest amount of sig figs given within the actual problem. This may require you to use scientific notation to clean up the numbers. I am not sure how important sig ...
by Inderpal Singh 2L
Mon Oct 05, 2020 10:22 am
Forum: Significant Figures
Topic: Significant Figures In A Given Weight
Replies: 11
Views: 186

Re: Significant Figures In A Given Weight

For anyone having trouble with significant figures, the following link is what I use if I ever get confused.

https://getstartedinscience.weebly.com/ ... orig.jpg?1

This summarizes the rules of significant figures pretty well :)
by Inderpal Singh 2L
Sat Oct 03, 2020 9:02 pm
Forum: Balancing Chemical Reactions
Topic: Mass conservation in chemical reactions [ENDORSED]
Replies: 3
Views: 414

Re: Mass conservation in chemical reactions [ENDORSED]

A good way to think of it is that the atoms of the products are created from the atoms of the reactants. They didn't just pop out of nowhere. (the atoms of the reactants are rearranged, bonded, etc. to become the products)
by Inderpal Singh 2L
Sat Oct 03, 2020 3:28 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions [ENDORSED]
Replies: 6
Views: 325

Re: Balancing Chemical Reactions [ENDORSED]

I started out with balancing the Fe, giving me: Fe3O4 + CO -> 3Fe + CO2. In an attempt to balance out the oxygens on both sides, I will add a 2 in front of carbon monoxide on the reactant side. This will give me: Fe3O4 + 2CO -> 3Fe + CO2. I will also add a 3 in front of the CO2 on the right in an at...
by Inderpal Singh 2L
Fri Oct 02, 2020 2:40 pm
Forum: Molarity, Solutions, Dilutions
Topic: G25
Replies: 3
Views: 143

G25

Can somehow please explain how the following is done: Practitioners of the branch of alternative medicine known as homeopathy claim that very dilute solutions of substances can have an effect. Is the claim plausible? To explore this question, suppose that you prepare a solution of a supposedly activ...
by Inderpal Singh 2L
Fri Oct 02, 2020 2:10 pm
Forum: Empirical & Molecular Formulas
Topic: Emprical Formulas Ever Larger than Molecular? [ENDORSED]
Replies: 26
Views: 458

Emprical Formulas Ever Larger than Molecular? [ENDORSED]

Since Empirical Formulas are ratios. Can empirical formulas ever be larger than the molecular formula? For instance, Glucose C6H12O6. Can the empirical formula be C12H24O6? I am guessing you would just simplify it down to C3H6O3.

Go to advanced search