## Search found 71 matches

Wed Jan 20, 2021 3:38 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8544
Views: 1474372

### Re: Post All Chemistry Jokes Here

Why did the noble gas cry? Because all his friends argon.
Wed Jan 20, 2021 3:34 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess Law
Replies: 10
Views: 153

### Re: Hess Law

You add up the values of the enthalpies and "cancel" out the reactants if those reactants are the same as those on the product side of another equation. If in case the coefficients are different, the equations can be combined algebraically. If one side of a reaction had say, 4H2 on the rea...
Wed Jan 20, 2021 3:20 pm
Forum: Phase Changes & Related Calculations
Topic: Phase Change
Replies: 5
Views: 54

### Re: Phase Change

I think that state is state property since it doesn't matter the pathway that the chemical takes to get to that phase.
Mon Jan 18, 2021 3:45 pm
Forum: Phase Changes & Related Calculations
Topic: heat capacity at constant volume vs constant pressure
Replies: 3
Views: 21

### Re: heat capacity at constant volume vs constant pressure

I think for an ideal gas at constant pressure, it takes more heat to achieve the same temperature change than it does at constant volume. At constant volume all the heat added goes into raising the temperature.But at constant pressure some of the heat goes to doing work.
Mon Jan 18, 2021 3:43 pm
Forum: Ideal Gases
Topic: Hw Question #4
Replies: 5
Views: 52

### Re: Hw Question #4

With gas pressures, you can still set up an ICE table since the K is given in Kp. It would be set up the same way as you would given molarity.
Thu Jan 14, 2021 2:20 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8544
Views: 1474372

### Re: Post All Chemistry Jokes Here

Have you heard of Boyle's Law? It's a law stating that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature. Now building on top of that, have you ever heard of Cole's Law? It's a salad dish of raw cabbage, carrots, and other vegetables mixed...
Thu Jan 14, 2021 2:17 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: pKA and pH
Replies: 8
Views: 48

### Re: pKA and pH

I think pka ad pkb aren't necessarily equal to ph and pOH, but they both will add to 14. If you think about the way Lavelle explains how p is (-log), then we can see how [H30+][OH-]=10^-14 and [Ka][Kb]=10^-14.
Thu Jan 14, 2021 10:16 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Textbook Problem 5J.5
Replies: 2
Views: 14

### Re: Textbook Problem 5J.5

When the pressure is increased, the reaction is going to favor the side with fewer moles. This is because, by the equation PV=nRT, we see that an increase in pressure creates an increase in moles. In order to retain equilibrium, the reaction will favor the side with fewer moles. So no change should ...
Tue Jan 12, 2021 11:35 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Video Module question 19
Replies: 3
Views: 25

### Re: Video Module question 19

Since we need the concentration (M) for the equation, divide the number of moles by the 3 liters.
Tue Jan 12, 2021 11:23 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Textbook 5G.9
Replies: 3
Views: 33

### Re: Textbook 5G.9

I think this reasoning would be okay as well, since Le Chatilier's principle states that the reaction will always establish equilibrium again it would do so by forming more products. This results in more moles in the same volume, which by the PV=nrT equation shows that the pressure does increase.
Fri Jan 08, 2021 3:18 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Textbook Problem 5J.11 Part D
Replies: 3
Views: 24

### Re: Textbook Problem 5J.11 Part D

Knowing that breaking of bonds is an endothermic process, that means that heat is a reactant in the process. Therefore with a temperature increase, the system will shift towards where there is less heat, which is the product side.
Fri Jan 08, 2021 3:15 pm
Forum: Ideal Gases
Topic: Bohr, Gay-Lussac, etc.
Replies: 3
Views: 30

### Re: Bohr, Gay-Lussac, etc.

I think as long as you remember how to isolate each variable and solve it using the given information, you will be okay.
Fri Jan 08, 2021 1:14 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Video Module Question 30 [ENDORSED]
Replies: 3
Views: 41

### Re: Video Module Question 30[ENDORSED]

With questions like this, it always helps me to immediately make sure all concentrations are given, so I always automatically convert given moles and grams to concentrations. Also, since there are no coefficients other than 1, after setting up the ICE table you would be able to solve an equation for...
Tue Jan 05, 2021 2:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q vs K
Replies: 12
Views: 70

### Re: Q vs K

Something that helped me remember is that K is the constant of a certain reaction when it is in equilibrium, but Q is the same formula using products and reactants at any stage of a reaction.
Mon Jan 04, 2021 3:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Problem 5G11
Replies: 5
Views: 32

### Re: Problem 5G11

I believe the reaction quotient Q is the same as the Kc. There was a previous question that asked this on the chemistry community too from a while back, but it seems the reaction quotient Q follows the same rules where you do not take into account solids or liquids.
Mon Jan 04, 2021 3:22 pm
Forum: Ideal Gases
Topic: Converting to Concentration and Pressure Values
Replies: 7
Views: 66

### Re: Converting to Concentration and Pressure Values

Another way to think of it is to rearrange the variables in the equation. We know that moles/volume is concentration, so n/V in this case is concentration. Solving for n/V in PV=nrT shows that concentration is equal to P/(R*T)
Mon Dec 07, 2020 12:20 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8544
Views: 1474372

### Re: Post All Chemistry Jokes Here

Why do chemists enjoy working with ammonia?
Because it's pretty basic stuff.
Mon Dec 07, 2020 12:18 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Acids and Bases
Replies: 4
Views: 42

### Re: Conjugate Acids and Bases

In general, a conjugate base is an anion that can absorb a proton in a chemical reaction. The conjugate acid is a cation that donates the proton or hydrogen in the reaction and loses the proton.
Mon Dec 07, 2020 12:17 pm
Forum: Calculating the pH of Salt Solutions
Topic: kbr?
Replies: 3
Views: 119

### Re: kbr?

In general, I believe cations from group 1 and group 2 are considered weak lewis acids and do not generate H3O+, and does not affect the pH, making it nuetral.
Mon Dec 07, 2020 12:15 pm
Forum: Calculating the pH of Salt Solutions
Topic: weak acid/base and pH
Replies: 9
Views: 158

### Re: weak acid/base and pH

If the salt has the anion of a weak acid, it will make the solution basic. If the salt has a cation of a weak base, it will make the solution acidic.
Mon Dec 07, 2020 12:14 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Electronegativity/acidity
Replies: 5
Views: 40

### Re: Electronegativity/acidity

If an acid has a more electronegative cation, the acid will more readily lose H+ ions. This is because the resulting anion is more stable, making the two parts ionize more easily, hence increasing the acidity.
Mon Dec 07, 2020 12:12 pm
Forum: Polyprotic Acids & Bases
Topic: Protonated Acid
Replies: 3
Views: 44

### Protonated Acid

In the lecture, Dr. Lavelle referred to protonated and alkaline solutions, what exactly does this mean?
Tue Dec 01, 2020 2:59 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8544
Views: 1474372

### Re: Post All Chemistry Jokes Here

I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO
Tue Dec 01, 2020 2:57 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Replies: 2
Views: 42

The radial distribution function is the probability distribution to find the center of a particle in a given position at a radial distance r from the center of a reference sphere. I just think the most important part of this concept it knowing that orbitals and wavefunctions are what give us the pro...
Tue Dec 01, 2020 2:50 pm
Forum: Limiting Reactant Calculations
Topic: Stoichiometric Problem
Replies: 3
Views: 46

### Re: Stoichiometric Problem

Hi bff so in the stoichiometric problem you would use the chemical equation to find ratios between any two molecules. From there you can use the ratio of moles to convert from moles to grams using molar mass.
Tue Dec 01, 2020 2:38 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands and Chelating Complexes
Replies: 2
Views: 26

### Re: Ligands and Chelating Complexes

if ligands are bidentate or more they can form a chelate. I believe this means they bind at more than one site.
Tue Dec 01, 2020 2:27 pm
Forum: Coordinate Covalent Bonds
Topic: mono, bi, tridentate
Replies: 2
Views: 37

### mono, bi, tridentate

Is whether a ligand is mono, bi, or tri dentate dependent on how many lone pairs it has?
Tue Dec 01, 2020 2:16 pm
Forum: Hybridization
Topic: identification
Replies: 5
Views: 66

### Re: identification

hybrid orbitals have to do with the regions of electron density. In this case, the five regions of electron density mean the hybridization is sp3d.
Tue Dec 01, 2020 1:52 pm
Forum: Naming
Topic: Ligand Names
Replies: 3
Views: 33

### Re: Ligand Names

I think that we have to know the general formula of ligand names( with the greek prefix) with the transition metal cation and the anion hydrate.
Wed Nov 25, 2020 8:14 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8544
Views: 1474372

### Re: Post All Chemistry Jokes Here

Two chemists go into a bar. The first one says "I think I'll have an H2O." The second one says "I think I'll have an H2O too" — and he died.
Wed Nov 25, 2020 8:13 am
Forum: Hybridization
Topic: Hybridization Clarification
Replies: 9
Views: 61

### Re: Hybridization Clarification

In lecture, Dr. Lavells referred to many "unhybridized orbitals". How exactly can you identify these?
Wed Nov 25, 2020 8:11 am
Forum: Electronegativity
Topic: How is electronegativity calculated?
Replies: 4
Views: 68

### Re: How is electronegativity calculated?

After looking into it, it looks like electronegativity cannot be calculated from the number of subatomic particles in an atom. However, using Ionization Energy and Electron Affinity, one can calculate the Electronegativity of an atom using the above equation.
Wed Nov 25, 2020 8:02 am
Forum: Lewis Structures
Topic: Octet Rule
Replies: 17
Views: 137

### Re: Octet Rule

I had a follow-up question to this discussion thread, is there a maximum number of electrons an expanded octect can accommodate?
Wed Nov 25, 2020 7:58 am
Forum: Dipole Moments
Topic: Dipole Moments Cancelling out
Replies: 10
Views: 98

### Re: Dipole Moments Cancelling out

It is also important to note that different electronegativities between elements indicate different "vector" lengths when drawing the dipole moments out. This could result in a net vector or dipole in one direction.
Thu Nov 19, 2020 9:06 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Hydrogen bonds and dipole-dipole
Replies: 8
Views: 92

### Hydrogen bonds and dipole-dipole

If a molecule has hydrogen bonds does it mean it has dipole-dipole as well?
Thu Nov 19, 2020 6:02 pm
Forum: Electronegativity
Topic: Electronegativity Trends
Replies: 8
Views: 89

### Re: Electronegativity Trends

Kind of as a follow-up question, how would you determine which element in a molecule would create a bigger difference in electronegativity? Like when trying to compare two molecules' iconic character?
Thu Nov 19, 2020 3:37 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8544
Views: 1474372

### Re: Post All Chemistry Jokes Here

What do you call a tooth in a glass of water? One molar solution
Wed Nov 18, 2020 1:56 pm
Forum: Hybridization
Topic: 2.a.13 part d sappling
Replies: 2
Views: 27

### 2.a.13 part d sappling

I had a question that came up as I was doing one of the textbook problems. I noticed that the first electron taken out of Cu to become an ion is taken from 4s. Why is this the case, if the electron configuration of NI is [Ar], 3d8, 4s2?
Mon Nov 16, 2020 5:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape generalities
Replies: 4
Views: 38

### Re: Molecular Shape generalities

It isn't always the same, but I have found that usually when a molecule has the same number of electron densities it becomes easy to assume a shape. For example, when an atom has 4 electron densities around it and no lone pairs, the shape is tetrahedral. When there is one lone pair, the topmost atom...
Mon Nov 16, 2020 5:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8544
Views: 1474372

### Re: Post All Chemistry Jokes Here

Why was the mole of oxygen molecules excited when he walked out of the singles bar?
Fri Nov 13, 2020 8:35 pm
Forum: Sigma & Pi Bonds
Topic: Triple bond?
Replies: 21
Views: 165

### Re: Triple bond?

So just to clarify, as the bond numbers increase (etc. single to triple), the number of sigma bonds stay the same and pi and delta increase?
Fri Nov 13, 2020 8:33 pm
Forum: Octet Exceptions
Topic: Octet Rule Exceptions
Replies: 20
Views: 170

### Re: Octet Rule Exceptions

I believe that any elements past the atomic number 10 can have an expanded octect. This is because we see that when there are 5 or 6 groupson the central atom, d- orbitals are involved which allow octects to expand.
Fri Nov 13, 2020 8:31 pm
Forum: Dipole Moments
Topic: Dipole dipole vs LDF
Replies: 10
Views: 59

### Re: Dipole dipole vs LDF

LDF happens between all molecules I believe, but dipole dipole will happen between polar ones. LDF only happens when symmetric molecules bind or molecules of the same molecular formula bind.
Mon Nov 09, 2020 4:13 pm
Forum: Bond Lengths & Energies
Topic: Sapling #4 Bond Length
Replies: 2
Views: 30

### Re: Sapling #4 Bond Length

To add on to the previous comment, I believe you would be able to tell which experimentally derived bond length fits which atom because the length is usually in between the single and double bond lengths, as in the example with CH above.
Mon Nov 09, 2020 4:09 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 3
Views: 32

### Re: Polarity

I believe if the difference in electronegativity for the atoms in a bond is greater than 0.4, we consider the bond polar. If the difference in electronegativity is less than 0.4, the bond is essentially nonpolar. If the electronegativity difference is greater than 2 it is considered ionic, and if it...
Sun Nov 08, 2020 9:02 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Distortion
Replies: 8
Views: 67

### Re: Distortion

I think the reason anions that are pulled into the shared region are classified as covalent is because a covalent bond indicates that two electrons are being shared by two molecules and unlike an ionic bond, are completely transferred over to the other molecule. In the shared region, the two electro...
Thu Nov 05, 2020 5:23 pm
Forum: Lewis Structures
Topic: Sapling Week5/6 Q3
Replies: 5
Views: 57

### Re: Sapling Week5/6 Q3

You could start this by drawing out the lewis structures for the nitrite, nitrate, phosphite, and phosphate ions. Nitrite has the formula NO2, which when drawn out without minimizing formal charges, would have single bonds between both Os and the N, leaving a formal charge of -1 on both Os and a for...
Thu Nov 05, 2020 5:16 pm
Forum: Octet Exceptions
Replies: 24
Views: 176

I believe that if there ever if one electron that is not paired in a molecule it would be considered a radical.
Mon Nov 02, 2020 1:23 pm
Forum: Octet Exceptions
Topic: Sulfur Octet Exception
Replies: 2
Views: 41

### Re: Sulfur Octet Exception

Just for further explanation, for atoms in the fourth period and beyond, higher d orbitals can be used for additional shared pairs beyond the octet. The energetic cost of using these higher orbitals to accommodate bonding electrons becomes smaller, as shown by the different atomic orbital energies.
Mon Nov 02, 2020 1:15 pm
Forum: Lewis Structures
Topic: Different Lewis Structures
Replies: 6
Views: 49

### Different Lewis Structures

If two resonance structures have a mirror image of eachother (have the same outer atoms connected to it), are they still considered two different resonance structures or can they be considered the same?
Fri Oct 30, 2020 10:08 am
Forum: Quantum Numbers and The H-Atom
Topic: Principal quantum number
Replies: 2
Views: 58

### Re: Principal quantum number

Another trend like this is seen in the l subshells, as you can find the number of subshells using 2l+1. For example, when l is 1, there are three subshells(2*1+1), -1, 0 and 1. when l is 2, there are five subshells(2*2+1), -2,-1, 0 and 1 and 2.
Wed Oct 28, 2020 4:29 pm
Forum: Trends in The Periodic Table
Replies: 30
Views: 420

An easy way to remember it is that as you go down a group, additional levels of shells are added, which adds tangible size to the atom. Across a period, the atomic radii decreases because as more electrons are added in the same shell, the effective nuclear charge, or Zeff, increases. This is the opp...
Wed Oct 28, 2020 4:26 pm
Forum: Ionic & Covalent Bonds
Topic: Is ionic or covalent stronger?
Replies: 31
Views: 393

### Re: Is ionic or covalent stronger?

Ionic bonds are stronger than covalent bonds because the electronegativity difference between the two elements is much greater than that of two elements in a covalent bond. In a covalent bond electrons are shared between the two elements and will often favor one element over the other depending on p...
Mon Oct 26, 2020 1:31 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chromium and Copper
Replies: 5
Views: 46

### Re: Chromium and Copper

The same is true for period 5 as it shows the same trend. for example, the electron configuration of silver is [Kr] 4d¹⁰ 5s¹ and the configuration for molybdenum is [Kr] 4d₅ 5s₁.
Mon Oct 26, 2020 1:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Hund's Rule
Replies: 4
Views: 48

### Re: Hund's Rule

Hund's rule tells us about how the electrons in an atom should be placed into degenerate orbitals and is important for distinguishing characteristics of bonding because of how the electrons are placed.
Fri Oct 23, 2020 10:35 pm
Forum: DeBroglie Equation
Topic: DeBroglie derivation
Replies: 2
Views: 41

### DeBroglie derivation

Could someone please explain the conceptual significance of the derivation of the DeBroglie particle equation?
Fri Oct 23, 2020 10:30 pm
Forum: Empirical & Molecular Formulas
Topic: workshop question emp formula
Replies: 3
Views: 68

### Re: workshop question emp formula

The general process I use to find empirical formulas from combustion is as follows: 1. Balance the combustion reaction, 2. Convert CO2 and H2O to moles. 3. convert moles of co2 and h20 into moles of c and h, respectively, and convert into grams of each element. 3. Subtract sum of grams of C and H fr...
Wed Oct 21, 2020 3:23 pm
Forum: Ionic & Covalent Bonds
Topic: 2A23 Part E
Replies: 4
Views: 85

### Re: 2A23 Part E

The group 5 elements have five valence electrons in their highest-energy orbitals so they can form ionic compounds by gaining three electrons, forming anions, but I believe they more frequently form compounds through covalent bonding. Bismuth can lose either their outermost p electrons to form 3+ ch...
Wed Oct 21, 2020 3:20 pm
Forum: Photoelectric Effect
Topic: Absorption of a photon
Replies: 4
Views: 35

### Re: Absorption of a photon

Once the frequency of the light exceeds the threshold frequency, photoemission begins. I did some more research regarding this and found Plank's quantum hypothesis, which states that the vibrational energy of atoms in a solid is not continuous but has only discrete values, which I believe would mean...
Mon Oct 19, 2020 3:45 pm
Forum: *Shrodinger Equation
Topic: Schrodinger for exam
Replies: 20
Views: 445

### Re: Schrodinger for exam

Schrodinger's equation is important because wavefunctions of certain electrons are obtained as solutions to this equation. For example, atomic orbitals would be one.
Fri Oct 16, 2020 8:46 pm
Forum: Photoelectric Effect
Topic: Sapling #4 Homework Part 2
Replies: 9
Views: 121

### Re: Sapling #4 Homework Part 2

The second part of the question is basically asking how many electrons will be ejected when the energy of each photon is equal to the work function. This occurs when the kinetic energy of the electrons is zero. You would divide the given 7.21 x 10^-7 J by the found work function to find the number o...
Thu Oct 15, 2020 11:41 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Difference regarding atomic spectroscopy and molecular spectroscopy
Replies: 3
Views: 55

### Difference regarding atomic spectroscopy and molecular spectroscopy

I saw on the chemistry outline for the Quantum World there was one point that states: With respect to electron transitions that give rise to a UV or visible spectrum: understand the difference between electronic transitions in atomic orbitals (atomic spectroscopy) and electronic transitions in molec...
Wed Oct 14, 2020 3:35 pm
Forum: Molarity, Solutions, Dilutions
Topic: E 29 part c
Replies: 12
Views: 1507

### Re: E 29 part c

Hi, we did this problem in discussion today but I missed the answers. For part a) I ended up getting 0.0423 moles and I was wondering why I got a different answer than posted above? I multiplied 8.61 g * (1 mol/ 202.484 g/mol). I got 202.484 g/mol by adding up the molar mass. I think it has to do w...
Wed Oct 14, 2020 3:27 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Difference Between Absorption and Emission Spectroscopy
Replies: 3
Views: 71

### Re: Difference Between Absorption and Emission Spectroscopy

So I was curious regarding this concept after the module as well and after doing some research I found that atomic emission spectroscopy uses transfer and differences in transfers of wavelengths to see how much was absorbed. It does go off of the fact that the wavelengths that are mitted are recorde...
Mon Oct 12, 2020 11:53 am
Forum: Properties of Electrons
Topic: Experiments of electrons
Replies: 5
Views: 184

### Re: Experiments of electrons

An easy way to remember that electrons behave as particles in the photoelectric experiment is to remember that when intensity of light was increased, it did not help to remove any more electrons from the metal. Here, increasing intensity of light increased the wavelength which had no effect on the e...
Mon Oct 12, 2020 11:46 am
Forum: Photoelectric Effect
Topic: Electron Emission
Replies: 5
Views: 46

### Re: Electron Emission

The energy of the incident photon must be equal to the sum of the metal's work function and the photoelectron kinetic energy. If the kinetic energy if the electron is zero, then by the equation it means the energy of the photon must be equal to the work function, or the energy required to remove an ...
Fri Oct 09, 2020 6:32 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Solving Atomic Spectra
Replies: 2
Views: 28

### Re: Solving Atomic Spectra

Usually in mathematical functions you should wait until the very end to round answers to any sig figs, which would help avoid errors as such. For example on this problem, you would first solve for the frequency using the equation -R(1/n^2-1/n^2). Then you would directly divide c (speed of light) by ...
Wed Oct 07, 2020 5:13 pm
Forum: Properties of Electrons
Topic: Question 35 Wave Properties of Electrons Post Module
Replies: 3
Views: 37

### Re: Question 35 Wave Properties of Electrons Post Module

Another way to solve this is using dimensional analysis. It goes back to the usage of the given equation, but you can also think of it in terms of dimensional analysis itself. In this case you would start with 275kg multiplied by 125 km.hr-1 knowing that to find a wavelength only given velocity in m...
Wed Oct 07, 2020 4:58 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E 23(a)
Replies: 3
Views: 56

### Re: E 23(a)

Whenever converting amount of moles of a certain ion in a mass of a compound, you use stoichiometric ratios which are given through balanced chemical reactions and the formula of the compound given. In this case it is CuBr2, so in this compound there is 1 mol Cu2+ ion in 1 mole cuBr2 and 2 moles Br-...
Mon Oct 05, 2020 10:44 am
Forum: Limiting Reactant Calculations
Topic: Week 1 Sapling HW Chem 14A Problem 10
Replies: 10
Views: 198

### Re: Week 1 Sapling HW Chem 14A Problem 10

Hi! I know this problem was already solved but in the case that a problem does not state which reactant is in excess, an easy to I have found to solve for limiting reactant is to first balance the chemical equation if not already given. Then I convert both reactants from grams to moles and use stoic...
Mon Oct 05, 2020 10:25 am
Forum: Molarity, Solutions, Dilutions
Topic: Diluting a Solution
Replies: 9
Views: 98

### Re: Diluting a Solution

In a situation like this, the moles solute do not necessarily stay the same since you are not "diluting" the solution, but just taking an actual portion of it and transferring it to a different container. You would know the moles in this solute by using the idea of molarity itself as the e...