Search found 60 matches

by Drew Myers 4G
Sun Jan 19, 2020 2:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in K when reaction is endothermic?
Replies: 2
Views: 6

Change in K when reaction is endothermic?

What happens to K when the temperature changes as a result of the reaction being endothermic?
by Drew Myers 4G
Sun Jan 19, 2020 2:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in K from Exothermic Reaction?
Replies: 2
Views: 6

Change in K from Exothermic Reaction?

What happens to K when the temperature changes as a result of the reaction being exothermic?
by Drew Myers 4G
Sun Jan 19, 2020 2:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in Pressure?
Replies: 2
Views: 7

Change in Pressure?

What happens to K when you change the pressure?
by Drew Myers 4G
Sun Jan 19, 2020 2:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in Volume?
Replies: 3
Views: 8

Change in Volume?

What happens to K when you change the volume?
by Drew Myers 4G
Sun Jan 19, 2020 2:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in Amount of P/R?
Replies: 2
Views: 7

Change in Amount of P/R?

What happens to K when you change the amount of product or reactant?
by Drew Myers 4G
Sat Jan 11, 2020 10:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating K
Replies: 5
Views: 19

Calculating K

Why do we not include solids or liquids when calculating K?
by Drew Myers 4G
Sat Jan 11, 2020 9:58 pm
Forum: Ideal Gases
Topic: Q and K
Replies: 2
Views: 16

Q and K

When do we use Q, and when do we use K?
by Drew Myers 4G
Sat Jan 11, 2020 9:54 pm
Forum: Ideal Gases
Topic: Units for K
Replies: 1
Views: 35

Units for K

Why are there no units for K?
by Drew Myers 4G
Sat Jan 11, 2020 9:52 pm
Forum: Ideal Gases
Topic: PV = nRT
Replies: 16
Views: 52

PV = nRT

What does each variable in PV = nRT stand for?
by Drew Myers 4G
Sat Jan 11, 2020 9:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Different K's
Replies: 5
Views: 23

Different K's

When are we supposed to use Kp, and when are we supposed to use Kc?
by Drew Myers 4G
Sat Dec 07, 2019 4:44 pm
Forum: Lewis Acids & Bases
Topic: 6.5
Replies: 1
Views: 21

Re: 6.5

After figuring out that the chemical equation is: H2O2 + SO3 -> H2SO5, you can determine that H2O2 is the Lewis base as it is the lone pair donor and SO3 is the Lewis acid as it is the lone pair acceptor.
by Drew Myers 4G
Sat Dec 07, 2019 4:42 pm
Forum: Identifying Acidic & Basic Salts
Topic: 6.21 (C)
Replies: 1
Views: 25

6.21 (C)

In part C, why do the NH groups act amphoteric?
by Drew Myers 4G
Sat Dec 07, 2019 4:39 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Weak Acids
Replies: 4
Views: 31

Weak Acids

How do you know if an acid is weak?
by Drew Myers 4G
Sat Dec 07, 2019 4:37 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: NH3
Replies: 1
Views: 14

NH3

Why is NH3 monodentate?
by Drew Myers 4G
Sat Dec 07, 2019 4:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: oxidation number
Replies: 1
Views: 13

Re: oxidation number

The easiest way to find the oxidation number is to substract the overall charge of the ligands from the overall charge of the coordinate compound.
by Drew Myers 4G
Sun Dec 01, 2019 8:02 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Inorganic or Organic
Replies: 6
Views: 31

Inorganic or Organic

How does one differentiate between inorganic and organic acids?
by Drew Myers 4G
Sun Dec 01, 2019 8:02 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Inorganic and organic
Replies: 3
Views: 20

Inorganic and organic

How does one differentiate between inorganic and organic bases?
by Drew Myers 4G
Sun Dec 01, 2019 7:59 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acid and Base
Replies: 5
Views: 23

Bronsted Acid and Base

Are Bronsted bases and acids determined based solely on if a proton is donated or accepted?
by Drew Myers 4G
Sun Dec 01, 2019 7:56 pm
Forum: Lewis Acids & Bases
Topic: Proton acceptor and proton donor?
Replies: 33
Views: 132

Re: Proton acceptor and proton donor?

Acids are proton donors and bases are proton acceptors.
by Drew Myers 4G
Sun Dec 01, 2019 7:55 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Compound
Replies: 5
Views: 29

Amphoteric Compound

What is an amphoteric compound, and what are some examples?
by Drew Myers 4G
Sun Nov 24, 2019 6:52 pm
Forum: Trends in The Periodic Table
Topic: Pneumonic devices for trends
Replies: 4
Views: 47

Pneumonic devices for trends

Does anyone have an easy way to memorize the trends in the periodic table?
by Drew Myers 4G
Sun Nov 24, 2019 6:51 pm
Forum: Quantum Numbers and The H-Atom
Topic: Calculating quantum numbers
Replies: 4
Views: 41

Calculating quantum numbers

What is the best way to calculate quantum numbers?
by Drew Myers 4G
Sun Nov 24, 2019 6:51 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Equation
Replies: 4
Views: 58

Heisenberg Equation

What exactly does heisenberg’s equation mean empirically?
by Drew Myers 4G
Sun Nov 24, 2019 6:50 pm
Forum: DeBroglie Equation
Topic: Lambda = h/p
Replies: 1
Views: 33

Lambda = h/p

What exactly does lambda = h/p mean empirically?
by Drew Myers 4G
Sun Nov 24, 2019 6:49 pm
Forum: Einstein Equation
Topic: e = hv
Replies: 1
Views: 30

e = hv

What exactly does E = hv mean empirically?
by Drew Myers 4G
Sun Nov 17, 2019 4:29 pm
Forum: Dipole Moments
Topic: London Forces
Replies: 4
Views: 25

London Forces

Am I right in saying that all molecules have london dispersion forces? If so, why is this the case?
by Drew Myers 4G
Sun Nov 17, 2019 4:28 pm
Forum: Dipole Moments
Topic: Ion-dipole molecular force
Replies: 3
Views: 23

Ion-dipole molecular force

What kinds of molecules are bonded with an ion-dipole molecular force?
by Drew Myers 4G
Sun Nov 17, 2019 4:26 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen Bonds
Replies: 6
Views: 30

Hydrogen Bonds

Which atoms can have hydrogen bonds?
by Drew Myers 4G
Sun Nov 17, 2019 4:23 pm
Forum: Sigma & Pi Bonds
Topic: explanation
Replies: 2
Views: 21

Re: explanation

Sigma bonds are formed by head to head overlapping orbitals, whereas pi bonds are formed by the lateral overlapping. Additionally, sigma bonds are stronger than pi bonds. Lastly, sigma bonds can be formed between both s and p orbitals whereas pi bonds are mostly formed between p and d orbitals.
by Drew Myers 4G
Sun Nov 17, 2019 4:23 pm
Forum: Sigma & Pi Bonds
Topic: Sigma V Pi
Replies: 5
Views: 30

Re: Sigma V Pi

Sigma bonds are formed by head to head overlapping orbitals, whereas pi bonds are formed by the lateral overlapping. Additionally, sigma bonds are stronger than pi bonds. Lastly, sigma bonds can be formed between both s and p orbitals whereas pi bonds are mostly formed between p and d orbitals.
by Drew Myers 4G
Sun Nov 10, 2019 4:36 pm
Forum: Lewis Structures
Topic: More than 8 electrons in structure?
Replies: 4
Views: 24

More than 8 electrons in structure?

Is the presence of the d-block the reason why atoms such as Xenon can go beyond the octet rule?
by Drew Myers 4G
Sun Nov 10, 2019 4:32 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity
Replies: 9
Views: 51

Electronegativity

So just to be sure, electronegativity follows the same trend as ionization energy and electron affinity on the periodic table right? If not, what trend does it follow?
by Drew Myers 4G
Sun Nov 10, 2019 4:27 pm
Forum: Bond Lengths & Energies
Topic: London Forces
Replies: 6
Views: 42

Re: London Forces

All compounds can have an instantaneous dipole moment (even ions) meaning that London Forces exist for all compounds.
by Drew Myers 4G
Sun Nov 10, 2019 4:23 pm
Forum: Dipole Moments
Topic: Difference between two attractive forces
Replies: 1
Views: 13

Re: Difference between two attractive forces

The main difference between the two is that dipole-dipole forces occur among molecules with dipole moments whereas London forces occur due to instantaneous dipoles that form in atoms or nonpolar molecules. I'm not sure how exactly you can tell if a compound has a dipole-dipole force from the chemica...
by Drew Myers 4G
Sun Nov 10, 2019 4:19 pm
Forum: Dipole Moments
Topic: What's a dipole
Replies: 4
Views: 17

Re: What's a dipole

A dipole is a pair of equal and oppositely charged or magnetized poles separated by a distance.
by Drew Myers 4G
Sun Nov 03, 2019 11:40 am
Forum: Coordinate Covalent Bonds
Topic: Single, double, and triple bonds
Replies: 6
Views: 42

Re: Single, double, and triple bonds

No. It depends on the radii of the elements themselves.
by Drew Myers 4G
Sun Nov 03, 2019 11:37 am
Forum: Electronegativity
Topic: Electronegativity Correlations
Replies: 3
Views: 20

Re: Electronegativity Correlations

Yes. Ionization energy and electron affinity positively correlate with electronegativity since the periodic trends align.
by Drew Myers 4G
Sun Nov 03, 2019 11:33 am
Forum: Bond Lengths & Energies
Topic: Strength of Bonds
Replies: 16
Views: 61

Strength of Bonds

Are longer bonds or shorter bonds stronger?
by Drew Myers 4G
Sun Nov 03, 2019 11:29 am
Forum: Ionic & Covalent Bonds
Topic: Drawing Ionic Compunds
Replies: 7
Views: 38

Drawing Ionic Compunds

How exactly are we supposed to draw ionic compunds? I know it was briefly addressed in class, but I’m still confused.
by Drew Myers 4G
Sun Nov 03, 2019 11:23 am
Forum: Lewis Structures
Topic: Atoms that can accept more than 8 Valence E-
Replies: 3
Views: 21

Atoms that can accept more than 8 Valence E-

Why are some atoms able to break the octet rule and accept more than 8 valence electrons?
by Drew Myers 4G
Sun Oct 27, 2019 2:11 pm
Forum: Trends in The Periodic Table
Topic: The Inert Pair Effect
Replies: 2
Views: 19

Re: The Inert Pair Effect

The reason for the effect is the inertness of the inner s electrons due to poor shielding.
by Drew Myers 4G
Sun Oct 27, 2019 2:09 pm
Forum: Trends in The Periodic Table
Topic: 1F.9
Replies: 1
Views: 26

Re: 1F.9

The first ionization energy for sulfur and phosphorus atoms are nearly the same, despite sulfur having a larger Zeff; this is due to greater electron-electron repulsions in S, making the energy of the outermost electrons higher than predicted. Once the first electron is removed, the Zeff becomes the...
by Drew Myers 4G
Sun Oct 27, 2019 2:05 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.17b
Replies: 1
Views: 14

Re: 1E.17b

Since 4s orbitals have lower energy, they are filled first. When 3D orbitals are filled, 4s is no longer lower in energy.
by Drew Myers 4G
Sun Oct 27, 2019 2:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.9
Replies: 1
Views: 16

Re: 1E.9

For part A, see if the quantum numbers are invalid. n=4, which means l can only be 0,1,2, or 3, and since it’s 2, l is valid. M(l) can only be -l through l, so it is valid as it is -1. Lastly, m(s) can be either -1/2 or +1/2, so it is valid. For part B, it is not possible because l = 0, so m(l) must...
by Drew Myers 4G
Sun Oct 27, 2019 1:57 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1F.19: s-block
Replies: 2
Views: 19

Re: 1F.19: s-block

S-block metals have lower ionization energies than p-block metals, which means that s-block metals tend to form cations as they are more willing to give away electrons. Thus, they are more reactive.
by Drew Myers 4G
Sat Oct 19, 2019 10:15 pm
Forum: Photoelectric Effect
Topic: Intensity of Light
Replies: 5
Views: 36

Re: Intensity of Light

The amount of energy is not what causes the photoelectric effect. It is caused by the wavelength of the light used.
by Drew Myers 4G
Sat Oct 19, 2019 10:13 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 43
Views: 1965

Re: E=hv

E represents the energy of the photon. The energy required to remove an electron is known as the work function/threshold energy and is not present in this equation.
by Drew Myers 4G
Sat Oct 19, 2019 9:40 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Which Element to Use in Electron Configurations
Replies: 5
Views: 33

Which Element to Use in Electron Configurations

When doing electron configurations for multi-electron atoms, do we always use the noble gas of the previous line to shorten the configuration? Why can't we use the atom that comes before the atom we're doing the configuration for?
by Drew Myers 4G
Sat Oct 19, 2019 9:37 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Purpose of the Equation
Replies: 9
Views: 49

Purpose of the Equation

So after hearing both a lecture and a discussion section about this equation, I am still incredibly confused as to what its purpose/use is. What is the purpose of this equation?
by Drew Myers 4G
Sat Oct 19, 2019 9:35 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Letter Names
Replies: 4
Views: 45

Re: Letter Names

After doing a little online research, the s, p, d, and f letters do have a history that can be discovered through this link: https://pubs.acs.org/doi/pdf/10.1021/ed084p757
by Drew Myers 4G
Sun Oct 13, 2019 3:29 pm
Forum: Photoelectric Effect
Topic: Mass of Neutron
Replies: 1
Views: 23

Mass of Neutron

What is the mass of a neutron, and when will we need to use it in this chapter/ever?
by Drew Myers 4G
Sun Oct 13, 2019 3:27 pm
Forum: Properties of Light
Topic: 1A.5
Replies: 3
Views: 25

1A.5

What is the order of energy from increasing to decreasing of gamma rays, x rays, UV light, visible light, and microwaves?
by Drew Myers 4G
Sun Oct 13, 2019 3:23 pm
Forum: Einstein Equation
Topic: Units
Replies: 17
Views: 625

Re: Units

Will there ever be a time where we need to use megagrams or gigagrams or will we likely only go as big as kilograms?
by Drew Myers 4G
Sun Oct 13, 2019 3:16 pm
Forum: Photoelectric Effect
Topic: Work Function for the Modules
Replies: 1
Views: 33

Re: Work Function for the Modules

The energy required to remove an electron is the work function, which they give you as 150.6 kJ/mol. All you need to do is convert that value into Joules, which is done by multiplying 150.6kJ/mol x 1000 g/kg = 150600 J/mol. Then divide that value by Avogadro's number (6.022 x 10^23 molecules/mol) to...
by Drew Myers 4G
Sun Oct 13, 2019 3:10 pm
Forum: Properties of Electrons
Topic: Lyman and Balmer Series
Replies: 2
Views: 26

Re: Lyman and Balmer Series

As you said, there are no other differences than them being in the visible light and UV regions (which also means that they have different wavelengths).
by Drew Myers 4G
Sat Oct 05, 2019 12:35 am
Forum: Limiting Reactant Calculations
Topic: M 15B
Replies: 1
Views: 33

M 15B

For problem M15 part B, how would you determine the mass of aluminum chloride that can be produced by the reactants? My answer is different from the one in the odd numbered examples solutions and I don't know why.
by Drew Myers 4G
Sat Oct 05, 2019 12:30 am
Forum: Balancing Chemical Reactions
Topic: H 7 a.
Replies: 3
Views: 35

Re: H 7 a.

To find the stoichiometric coefficients, simply balance the chemical equation.
Before balance: Ca + H2O -> H2 + Ca(OH)2
Balanced: Ca + 2H20 -> H2 + Ca(OH)2
The stoichiometric coefficients are 1, 2, 1 and 1.
by Drew Myers 4G
Sat Oct 05, 2019 12:27 am
Forum: Molarity, Solutions, Dilutions
Topic: G 5a.
Replies: 1
Views: 32

Re: G 5a.

In order to get the volume needed, you must first find the molarity of Na2CO3 : (2.111g)/(105.99g.mol^-1 x 0.2500L) = .07967 mol Na2CO3. From there, determine the mol of Na+ ions present in Na2CO3 (there are 2). Then, solve for the volume by dividing the mol of Na+ given by the molarity found before...
by Drew Myers 4G
Sat Oct 05, 2019 12:20 am
Forum: Molarity, Solutions, Dilutions
Topic: G 21a.
Replies: 1
Views: 25

Re: G 21a.

In order to find the mol K+ in the problem, you have to first convert the .500 g KCl, K2S, and K3PO4 into mol instead of grams using their molar masses which can be determined from the periodic table. After doing so, look at each compound and see how many mol of potassium ions are in each (KCl has 1...
by Drew Myers 4G
Sat Oct 05, 2019 12:12 am
Forum: Significant Figures
Topic: Sig Figs in % Yield
Replies: 10
Views: 136

Sig Figs in % Yield

Imagine that a problem asks you to find the percent yield but wants 2 sig figs, and the end answer you get is 63.5%. Would that round up to 64% or down to 63%, and why?

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