Search found 80 matches

by Christineg1G
Mon Jan 27, 2020 2:06 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Week 4 Homework
Replies: 11
Views: 35

Re: Week 4 Homework

This week we are going over outline 3 which is thermochemistry. I would suggest doing homework problems that come from focus 4 in the textbook.
by Christineg1G
Mon Jan 27, 2020 2:02 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 4A 1 Part c)
Replies: 4
Views: 16

Re: 4A 1 Part c)

A bomb calorimeter would be a isolated system that works at a constant volume where heat (energy) is exchanged and volume is constant (isochoric).
by Christineg1G
Mon Jan 27, 2020 1:54 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units for enthalpy
Replies: 3
Views: 16

Re: Units for enthalpy

For the standard enthalpy of reaction, the units would be kJ/mol.
by Christineg1G
Mon Jan 27, 2020 1:49 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: bomb calorimeter
Replies: 5
Views: 12

Re: bomb calorimeter

A bomb calorimeter is a constant volume calorimeter that is used to measure the heat of specific reactions.
by Christineg1G
Mon Jan 27, 2020 10:46 am
Forum: General Science Questions
Topic: Fall 2019 final
Replies: 7
Views: 28

Re: Fall 2019 final

Although Lavelle said we can pick up the finals during week 3 from Young Hall 3034, I would recommend to go check to see if it’s available to pick up. I went around 8:40am and the office was open.
by Christineg1G
Tue Jan 21, 2020 9:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw
Replies: 1
Views: 17

Kw

How would you know when to use Ka x Kb= Kw when solving for pH? For example in 6D.17 (a) you would need to find the Kb value using Kb= Kw/Ka.
I know you would use it for finding the pH of salt solutions, but what are some indicators to help let us know that we need to use that constant?
by Christineg1G
Mon Jan 20, 2020 2:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH of salt solutions
Replies: 2
Views: 15

pH of salt solutions

If we are given a problem and asked to calculate the pH, how would we know if we should follow the steps for calculating the pH of salt solutions (like finding the Ka value if we are given the Kb value) or just continue with the calculations and not solve for either Ka or Kb and just use the value w...
by Christineg1G
Mon Jan 20, 2020 9:48 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5% rule clarification
Replies: 2
Views: 9

Re: 5% rule clarification

If k<10^-3 you can attempt an approximation. To ensure the validity of your approximation, you should check by dividing the x value you received over the initial concentration. If this value is less than 5%, your approximation is valid.
by Christineg1G
Mon Jan 20, 2020 9:37 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Effect of Increasing Temperature on an Equilibrium System
Replies: 4
Views: 14

Re: Effect of Increasing Temperature on an Equilibrium System

Exothermic reactions give off heat while forming product, and reactant formation will be favored. For exothermic reactions, you can picture heat as being a product and apply Le Chatelier's principle of what happens when you add product to a system. Therefore, increasing the temperature will shift th...
by Christineg1G
Mon Jan 20, 2020 9:32 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding Inert Gas
Replies: 9
Views: 28

Re: Adding Inert Gas

An inert gas is another term for noble gas. Also, the addition of an inert gas, for example argon or krypton, to a reaction will have no effect on the system.
by Christineg1G
Mon Jan 20, 2020 9:28 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: q vs k
Replies: 9
Views: 15

Re: q vs k

Yes, when Q=K the solution has reached its equilibrium composition and doesn't change in either direction.
by Christineg1G
Mon Jan 20, 2020 9:26 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: pKa and pKb
Replies: 17
Views: 47

Re: pKa and pKb

pKa is the negative base-10 logarithm of the acid dissociation constant (Ka) of a solution and pKb is the negative base-10 logarithm of the base dissociation constant (Kb). pKa and pKb added together equals 14.
by Christineg1G
Wed Jan 15, 2020 9:47 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 5I.11 units
Replies: 5
Views: 28

5I.11 units

For HW 5I.11 how would the concentration of SO2, O2, and SO3 be converted from nmol to mol. For example how is the concentration of SO2=1.20nmol converted to 1.20x10^-3 mol?
by Christineg1G
Mon Jan 13, 2020 4:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: lecture 1/13 topic
Replies: 1
Views: 25

lecture 1/13 topic

What did Dr. Lavelle mean in lecture 1 today when he said that 10^-12 is actually and would be correct if it were written as 10^-7 for the concentration of H3O+?
by Christineg1G
Mon Jan 13, 2020 4:02 pm
Forum: Student Social/Study Group
Topic: Notes for 1/13 Lecture
Replies: 4
Views: 40

Re: Notes for 1/13 Lecture

In addition to the post made before this, we also reviewed the meanings of neutralization (reaction between acid and base, product is salt and water), amphiprotic (proton donor and acceptor, like water), and autoprotolysis (proton transfer between same type of molecule).
by Christineg1G
Mon Jan 13, 2020 3:58 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5J.3
Replies: 5
Views: 20

Re: 5J.3

According to Le Chatelier's principle, removing NO will lead to the formation of more products. So to maintain equilibrium, the amount of NH3 will decrease. Hope this helps!
by Christineg1G
Mon Jan 13, 2020 3:53 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5J.1
Replies: 3
Views: 12

Re: 5J.1

You would use Le Chatelier's principle and know that if a reactant is increased, in this example being CO, the system will shift the equilibrium to the right towards the products, thus increasing the concentration of H2.
by Christineg1G
Mon Jan 13, 2020 3:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Textbook question 5.39
Replies: 1
Views: 24

Re: Textbook question 5.39

For part (a) you should double check their I.C.E table as well as the expression for Kc which should be (N2O4)/(NO2)^2. After inputting the values from your I.C.E table into the Kc expression, you should be solving for the equation: 6.4x10^2 x^2 - 14x + 0.064=0. After you plug this equation into the...
by Christineg1G
Thu Jan 09, 2020 9:19 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: units of K
Replies: 10
Views: 29

Re: units of K

Equilibrium constants don't have units because we used the active masses of the substances, hence why they are unit less/eliminated from the equilibrium constant expression.
by Christineg1G
Thu Jan 09, 2020 9:11 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: solids/liquids
Replies: 4
Views: 19

Re: solids/liquids

Gases and aqueous solutions would only be used and considered in equilibrium expressions since the concentration of pure solids and liquids does not change.
by Christineg1G
Thu Jan 09, 2020 9:06 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5H.3
Replies: 4
Views: 30

Re: 5H.3

You would use the values of K in the table to determine the value of K for the reaction. So you would use K=377 for the expression 2BrCl<->Br2+Cl2 and K=4.0x10^31 for the expression H2+Cl2<->2HCl. You would then multiply the values of K1 and K2 to get your answer.
by Christineg1G
Thu Jan 09, 2020 9:02 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G3
Replies: 8
Views: 25

Re: 5G3

Yes, you would include gases in equilibrium expressions, but you wouldn't include solids or liquids.
by Christineg1G
Thu Jan 09, 2020 9:00 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs. Q
Replies: 10
Views: 47

Re: K vs. Q

K would be known as the equilibrium constant, Kc. K can also be used to calculate the partial pressure of a species at equilibrium, Kp. Q is the reaction quotient and it is used to determine which direction a reaction will proceed. Q or Qc or Qp are calculated the same way as K, but for Q, the react...
by Christineg1G
Sat Dec 07, 2019 9:45 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 2oh- and oh-
Replies: 1
Views: 14

2oh- and oh-

When solving for pH, how would you know to use 2OH- or OH- in your calculations? Does it have to do with the present of an oxide?
by Christineg1G
Mon Dec 02, 2019 9:34 pm
Forum: Bronsted Acids & Bases
Topic: stronger acid ?
Replies: 3
Views: 26

stronger acid ?

why is HClO2 stronger than HBrO2 ?
by Christineg1G
Mon Dec 02, 2019 3:55 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: lecture example pKa Ka
Replies: 2
Views: 24

lecture example pKa Ka

From the pKa and Ka example done in lecture today, what factors would show that the Ka=6.0x10^-5 is a weak acid and that the equilibrium constant is small?
by Christineg1G
Mon Dec 02, 2019 3:46 pm
Forum: Lewis Structures
Topic: 2D.1
Replies: 1
Views: 23

Re: 2D.1

Remember that the trends for electronegativity are that it increases as you go up a group and increases as you go across a period. To answer your question it will be: indium<tin<antimony<selenium
by Christineg1G
Mon Dec 02, 2019 3:01 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: H-F, H-Cl, H-Br, and H-I
Replies: 3
Views: 24

Re: H-F, H-Cl, H-Br, and H-I

Remember that bond length increases with atomic radius. So, the longer the bond is between two elements, the stronger the acid is. For example, H-I has the longest bond, so it will be the strongest acid. And vice versa, the shorter the bond is, the weaker the acid is. So, H-F would be the weakest ac...
by Christineg1G
Mon Dec 02, 2019 9:31 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH vs pOH
Replies: 4
Views: 37

pH vs pOH

After your calculation, how would you determine which value is your pH and your pOH?
For example in 6B. 5D how would you determine that 3.15 is your pOH and 10.85 is your pH?
by Christineg1G
Mon Dec 02, 2019 9:25 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH scale
Replies: 12
Views: 59

Re: pH scale

The pH scale is most common between 0-14, but it is possible to go above or below 0 or 14. In the case of very acidic acids known as super acids, the pH scale goes below 0.
by Christineg1G
Mon Nov 25, 2019 3:47 pm
Forum: Bronsted Acids & Bases
Topic: J.9C and ionic equations
Replies: 1
Views: 41

J.9C and ionic equations

How would you write the complete ionic equation for reactions?
For example, J.9C which asks to write the ionic equation and identify the salt produced from calcium hydroxide and bromous acid.
by Christineg1G
Mon Nov 25, 2019 2:56 pm
Forum: Bronsted Acids & Bases
Topic: 6A.5
Replies: 1
Views: 20

Re: 6A.5

The acid which would be HNO3 would be determined because acids usually have a H atom attached to it and you can see that the conjugate base to the HNO3 would be NO3-. As for the base, it will be HPO4^2- because you can see that its conjugate acid, which is H2PO4-, has a one extra H atom attached to ...
by Christineg1G
Mon Nov 25, 2019 2:46 pm
Forum: Amphoteric Compounds
Topic: amphoteric compounds
Replies: 2
Views: 43

amphoteric compounds

How would you know that As2O3 and Bi2O3 are amphoteric, while BaO is basic?
by Christineg1G
Mon Nov 25, 2019 2:35 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: charge and oxidation state
Replies: 2
Views: 23

charge and oxidation state

How do you find the charge of a ligand and also the oxidation state?
by Christineg1G
Mon Nov 25, 2019 9:25 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: brackets
Replies: 13
Views: 59

Re: brackets

Whatever is inside the brackets is directly bound to the transition metal and is in the coordination sphere. Hope this helps!
by Christineg1G
Tue Nov 19, 2019 7:18 pm
Forum: Dipole Moments
Topic: boiling point
Replies: 6
Views: 80

boiling point

Why would HI have a higher boiling point than HBr if HBr has a stronger dipole-dipole force? Would we go based off of the fact that HI is larger than HBr?
by Christineg1G
Tue Nov 19, 2019 7:00 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: polarizability
Replies: 9
Views: 65

polarizability

What is the role of polarizability when determining higher and lower melting/boiling points of compounds?
by Christineg1G
Mon Nov 18, 2019 2:03 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: wedge and dash
Replies: 2
Views: 22

Re: wedge and dash

The wedge and dash would be used for VSEPR 3D structures of molecules. The wedge would be used to show that the element is sticking forward/coming towards us and the dash would be used to show that the element is pointing away from us/sticking back.
Hope this helps!
by Christineg1G
Mon Nov 18, 2019 1:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: lone pairs VSEPR
Replies: 1
Views: 24

lone pairs VSEPR

In terms of repulsion and VSEPR, if a compound has lone pairs, should they always be placed in the equatorial plane instead of the axial plane?
by Christineg1G
Mon Nov 18, 2019 1:57 pm
Forum: Student Social/Study Group
Topic: Test 2 Study Worksheets
Replies: 9
Views: 199

Re: Test 2 Study Worksheets

Naren_Ramesh_4D wrote:What room in Covel is the study session in?

The study sessions are in Covel 210
by Christineg1G
Mon Nov 18, 2019 1:55 pm
Forum: Dipole Moments
Topic: Dipole moments
Replies: 4
Views: 28

Re: Dipole moments

Dipole moments will be drawn with the arrow pointing towards the partial negative element, rather than the partial positive.
by Christineg1G
Mon Nov 18, 2019 1:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 6
Views: 39

Re: Test 2

The final is cumulative, so yes I'm assuming hybridization will be covered on the final.
by Christineg1G
Mon Nov 11, 2019 8:24 pm
Forum: Ionic & Covalent Bonds
Topic: Exam 2 & Homework
Replies: 5
Views: 43

Re: Exam 2 & Homework

Test 2 will start the week of November 19 in discussion.
by Christineg1G
Mon Nov 11, 2019 10:09 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: hydrogen bonding in water
Replies: 3
Views: 21

hydrogen bonding in water

What do the series of short lines represent in bonds? For example, the hydrogen bonding in water example that was shown in class on Friday.
by Christineg1G
Mon Nov 11, 2019 10:03 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Difference Between Lewis Structure and VSEPR Model
Replies: 3
Views: 22

Re: Difference Between Lewis Structure and VSEPR Model

A lewis structure is a dot diagram that shows the valence electrons as well as various bonds present in elements. While VSEPR is used to draw and name the different molecular shapes like bent, linear, tetrahedral, etc. These shapes are determined based off of the lewis structure and the VSEPR theory.
by Christineg1G
Mon Nov 11, 2019 9:58 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: Dimers
Replies: 1
Views: 17

Re: Dimers

A dimer would be two monomers that are linked together by intermolecular or covalent bonds and/or interactions.
by Christineg1G
Mon Nov 11, 2019 9:53 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: difference between intermolecular forces
Replies: 3
Views: 18

difference between intermolecular forces

What are some key factors to remember when trying to distinguish between dipole-dipole, London forces, induced dipole-induced dipole, and hydrogen bonding?
by Christineg1G
Mon Nov 04, 2019 4:15 pm
Forum: DeBroglie Equation
Topic: de Broglie vs electromagnetic radiation
Replies: 3
Views: 43

de Broglie vs electromagnetic radiation

How do you know when to use the De Broglie equation or the equations for electromagnetic radiation like E=hV
by Christineg1G
Mon Nov 04, 2019 3:44 pm
Forum: Quantum Numbers and The H-Atom
Topic: Orbital vs Subshells
Replies: 3
Views: 36

Re: Orbital vs Subshells

Orbitals within a shell are divided into subshells that have the same value of the angular quantum number l, which determines which orbital the element is in (s,p,d,or f). l=0, corresponds to the s orbital, l=1 corresponds to the p orbital, l=2 corresponds to the d orbital, and l=3 corresponds to th...
by Christineg1G
Mon Nov 04, 2019 2:35 pm
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 4
Views: 31

Re: Lewis Structure

After determining the number of valence electrons for each element, you would use the element with the lowest ionization energy. Also, know that H can never be the central atom.
by Christineg1G
Mon Nov 04, 2019 2:31 pm
Forum: Lewis Structures
Topic: When to use brackets
Replies: 2
Views: 25

Re: When to use brackets

When writing shorthand electron configurations, you would use brackets to indicate the element that comes before the compound you are writing the configuration for. For example, for Sc you will write [Ar] 3d^1 4s^2
by Christineg1G
Mon Nov 04, 2019 2:26 pm
Forum: General Science Questions
Topic: Concept Questions
Replies: 2
Views: 45

Re: Concept Questions

Attending the review sessions are helpful as well if you need help on specific concepts/sections.
by Christineg1G
Mon Nov 04, 2019 2:18 pm
Forum: General Science Questions
Topic: Midterm
Replies: 12
Views: 169

Re: Midterm

Every student is assigned to a specific testing location based on their last name and if they're either in a 10am, 12pm, or 2pm lecture. The list is on the class website.
by Christineg1G
Sat Nov 02, 2019 4:08 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: dino nuggets 13 (c)
Replies: 1
Views: 60

dino nuggets 13 (c)

I understand that we are supposed to use the indeterminacy equation to solve 13 (c), from the midterm practice, but when I input the values into the calculator, I am not getting the correct answer, which is supposed to be 2.8x10^-32 m. I have converted the 2.8 g to kg and am solving for delta x. Can...
by Christineg1G
Mon Oct 28, 2019 7:28 pm
Forum: Trends in The Periodic Table
Topic: electronegativity table
Replies: 5
Views: 35

electronegativity table

Would we be given a table on tests in order to determine electronegativity of elements?
by Christineg1G
Mon Oct 28, 2019 6:40 pm
Forum: Ionic & Covalent Bonds
Topic: ionic bonding 2A.13
Replies: 1
Views: 20

ionic bonding 2A.13

In homework problem 2A.13, part (b), why would a 3p orbital need to be removed from Cl in order to form a +1 ion?
by Christineg1G
Mon Oct 28, 2019 6:22 pm
Forum: Octet Exceptions
Topic: Unpaired Electrons
Replies: 1
Views: 24

Re: Unpaired Electrons

I had trouble figuring out why this occurred as well, but I found a post made by Dr. Lavelle a few years ago on Chemistry Community stating, "It seems that the correct answer is based off molecular orbital arguments that are outside of the scope of this course."
Hope this helps!
by Christineg1G
Mon Oct 28, 2019 6:12 pm
Forum: Lewis Structures
Topic: 2B.11c
Replies: 2
Views: 34

Re: 2B.11c

I recommend taking it step by step or by portions because this will ensure that the correct atoms as well as the correct number of atoms will be bonded with each other. You can also take a look at the solutions manual for help with drawing the lewis structure. Hope this helps!
by Christineg1G
Mon Oct 28, 2019 6:08 pm
Forum: Properties of Light
Topic: Midterm formulas
Replies: 6
Views: 74

Re: Midterm formulas

I believe it will be the same as our first test, where we were given formulas as well as the periodic table.
by Christineg1G
Tue Oct 22, 2019 5:59 pm
Forum: Student Social/Study Group
Topic: Video Module For New Material
Replies: 4
Views: 82

Re: Video Module For New Material

He has not said anything recently about posting any new modules
by Christineg1G
Mon Oct 21, 2019 4:31 pm
Forum: Properties of Electrons
Topic: Angstrom
Replies: 2
Views: 36

Re: Angstrom

700 nm would be 7000 angstrom
(1nm is equal to 10 angstrom)
by Christineg1G
Mon Oct 21, 2019 4:27 pm
Forum: Einstein Equation
Topic: Converting Energy Units
Replies: 2
Views: 19

Re: Converting Energy Units

You would use 1.6022 x 10^-19 J/eV to convert between the two units
by Christineg1G
Mon Oct 21, 2019 4:24 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: determining the number of orbitals
Replies: 1
Views: 26

determining the number of orbitals

Is it possible to determine the number of orbitals in a shell by only being given the principle quantum number, n, or would you need the angular momentum quantum number as well?
by Christineg1G
Mon Oct 21, 2019 4:11 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shell vs. Orbital
Replies: 3
Views: 24

Re: Shell vs. Orbital

Shell=All electrons are in the same shell when they have the same value for n (the principle quantum number) Sub-shell= Within a shell (same n), all electrons that share the same l (the angular momentum quantum number, or orbital shape) are in the same sub-shell Orbital= When electrons share the sam...
by Christineg1G
Tue Oct 15, 2019 6:56 pm
Forum: Quantum Numbers and The H-Atom
Topic: 1D 11
Replies: 4
Views: 39

Re: 1D 11

l, which is the angular quantum number, represents the shape of the orbital.
m shows the number of orbitals in a sublevel. For example, m=-1,0,+1 shows that there is 3 orbitals in the p sublevel.
n is the energy level of the orbital.
by Christineg1G
Mon Oct 14, 2019 6:32 pm
Forum: *Shrodinger Equation
Topic: Midterm
Replies: 14
Views: 211

Re: Midterm

No, there's only one midterm.
by Christineg1G
Mon Oct 14, 2019 6:28 pm
Forum: Properties of Light
Topic: Symbol review
Replies: 3
Views: 28

Re: Symbol review

Ψ (psi)= wave function
by Christineg1G
Mon Oct 14, 2019 5:36 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Positive and Negative signs?
Replies: 5
Views: 45

Re: Positive and Negative signs?

I believe that if energy is leaving a system or if the force and displacement are moving in the opposite direction, then we use a negative sign to represent that. And vice versa if energy is entering a system, or the force and displacement are moving in the same direction, we would use a positive si...
by Christineg1G
Mon Oct 14, 2019 5:27 pm
Forum: *Shrodinger Equation
Topic: Shrodinger Equation
Replies: 1
Views: 25

Re: Shrodinger Equation

Psi represents the height of a wave at a specific position such as x, y, or z. The wave of this function is represents as a sine function. Psi squared represents the probability of finding an electron, and this value is always positive. Also, for Psi squared, the peak of the wave has a high probabil...
by Christineg1G
Thu Oct 10, 2019 7:53 pm
Forum: Properties of Light
Topic: Frequency
Replies: 2
Views: 45

Re: Frequency

"v" comes from the Greek symbol "nu" (v) which is used to represent the frequency of a light wave.
Hope this helps!
by Christineg1G
Thu Oct 10, 2019 7:48 pm
Forum: Limiting Reactant Calculations
Topic: M7
Replies: 1
Views: 52

Re: M7

You would first start off by converting the 125kg of B2O3 to grams so you should get 125x10^3g B2O3. You would then multiply that value by 1 mole of B2O3/ 69.619g B2O3, times 2 mol B/1mol B2O3 (gotten from the balanced equation), times 10.811 g B/1 mol B. You should get the answer 3.88x10^4 g B prod...
by Christineg1G
Thu Oct 10, 2019 7:38 pm
Forum: Student Social/Study Group
Topic: Pen or Pencil for Homework Problems?
Replies: 8
Views: 72

Re: Pen or Pencil for Homework Problems?

There is nothing on the syllabus that says whether we should use a pen or pencil on the homework assignments, so you can use either one.
by Christineg1G
Mon Oct 07, 2019 4:39 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula Help [ENDORSED]
Replies: 7
Views: 131

Re: Empirical Formula Help [ENDORSED]

After you find the amount of moles in each element, you divide the mole values you found by the smallest number of moles calculated. After this step, the outcomes of your division (which should be rounded to whole numbers, if possible) will determine the values for the empirical formula. If your out...
by Christineg1G
Mon Oct 07, 2019 3:33 pm
Forum: Limiting Reactant Calculations
Topic: Percent yield
Replies: 3
Views: 40

Percent yield

How would you calculate theoretical yield without being given the percent or actual yield? Would you just multiply moles by the molar mass ?
by Christineg1G
Mon Oct 07, 2019 3:15 pm
Forum: Balancing Chemical Reactions
Topic: Homework Question H21
Replies: 5
Views: 79

Re: Homework Question H21

Your final answer should be:
2 C10H15N (s) + 26 O2 --> 19 CO2 (g) + 13 H20 (l) + CH4N2O (aq)
by Christineg1G
Sun Sep 29, 2019 2:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 130
Views: 3396

Re: Advice from a Medical Student - Part II [ENDORSED]

Thank you for sharing your insight on your journey in medical school! It's always inspiring to read about students who are taking a similar career pathway as me and see their view on this career and the different steps they take. I am also not sure what field I would want to specialize in, but am lo...
by Christineg1G
Sun Sep 29, 2019 2:17 pm
Forum: Significant Figures
Topic: Significant figures clarification
Replies: 3
Views: 59

Significant figures clarification

I need some clarification on basic sigfig rules. For example if we end up with the number 0.126358352 after a calculation, how would the correct answer be 1.264 x 10^-2 ?
by Christineg1G
Sun Sep 29, 2019 2:03 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Mole
Replies: 1
Views: 60

Re: Mole

One reason Avogadro chose carbon-12 to determine a mole is because when compared to other elements on the periodic table, carbon-12's atomic mass is measured particularly accurate. Also, a mole is the number of atoms in exactly 12g of carbon-12, which has become the standard for determining a mass o...
by Christineg1G
Sun Sep 29, 2019 1:52 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula
Replies: 6
Views: 61

Re: Empirical Formula

Using the empirical formula rather than the molecular formula is based on what you want to determine from the compound. It's important to use the empirical formula if you want to know the relative number of atoms in a molecule, rather than the actual number of atoms (which is the molecular formula)....
by Christineg1G
Fri Sep 27, 2019 6:13 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 29
Views: 416

Re: Ionic vs Covalent

I also agree that ionic bonds are stronger than covalent bonds.

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