## Search found 56 matches

Sat Jan 09, 2021 2:11 am
Forum: Ideal Gases
Topic: Ideal Gas Definition
Replies: 10
Views: 44

### Re: Ideal Gas Definition

ideal gasses are just theoretical for simplicity and calculations as they don't have interparticle interactions
Sat Jan 09, 2021 2:06 am
Forum: Ideal Gases
Topic: Finding x for K using quadratic equation
Replies: 6
Views: 40

### Re: Finding x for K using quadratic equation

apply the x to the final concentrations of both the product and reactants, the one that doesn't make either negative is the correct x
Sat Jan 09, 2021 2:06 am
Forum: Ideal Gases
Topic: Finding x for K using quadratic equation
Replies: 6
Views: 40

### Re: Finding x for K using quadratic equation

apply the x to the final concentrations of both the product and reactants, the one that doesn't make either negative is the correct x
Sat Jan 09, 2021 2:03 am
Forum: Ideal Gases
Topic: PV=nRT and concentration
Replies: 27
Views: 94

### Re: PV=nRT and concentration

we can change the n/v into concentration because the definition of molarity is just moles/liters so they are substitutable
Sat Jan 09, 2021 2:00 am
Forum: Ideal Gases
Topic: Gas constant R
Replies: 21
Views: 62

### Re: Gas constant R

gas constant is given on the equation sheet as 8.3145 J mol^-1K^-1
Sat Jan 09, 2021 1:58 am
Forum: Ideal Gases
Topic: Kc vs Kp
Replies: 106
Views: 882

### Re: Kc vs Kp

kp is used if it is calculated using partial pressure while kc is used if it is calculated using concentration
Sat Dec 12, 2020 4:27 pm
Forum: Polyprotic Acids & Bases
Topic: Polyprotic Acids
Replies: 6
Views: 47

### Re: Polyprotic Acids

yes the anion will have more than 1 hydrogen
Sat Dec 12, 2020 4:19 pm
Forum: Polyprotic Acids & Bases
Topic: Polyprotic Acids and Bases
Replies: 4
Views: 41

### Re: Polyprotic Acids and Bases

yep polyprotic just means they can accept or donate more than 1 h+
Sat Dec 12, 2020 4:17 pm
Forum: Polyprotic Acids & Bases
Topic: Defintion
Replies: 24
Views: 760

### Re: Defintion

acids are polyprotic when they donate more than 1 h+ :H2SO4, H2CO3, H3PO4
Sat Dec 12, 2020 4:14 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Why isn't HF a strong acid?
Replies: 23
Views: 118

### Re: Why isn't HF a strong acid?

hf is a weak acid due to its size the bond length is short and therefore stronger making it dissociate less in water
Sat Dec 12, 2020 4:10 pm
Forum: Polyprotic Acids & Bases
Topic: Polyprotic Acids and Bases
Replies: 2
Views: 23

### Re: Polyprotic Acids and Bases

also their conjugate base all accept more than 1 h+
Sat Dec 05, 2020 5:37 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strength of Acids
Replies: 8
Views: 67

### Re: Strength of Acids

acids are stronger when they can easily dissociate in water and since br has a longer and weaker bond then it makes the stronger acid
Sat Dec 05, 2020 5:33 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Trichloroacetic acid example
Replies: 4
Views: 32

### Re: Trichloroacetic acid example

pka is the negative log of ka the acid dissociation constant, the lower the pka the stronger the acid
Sat Dec 05, 2020 5:22 pm
Forum: Naming
Topic: Sapling
Replies: 11
Views: 105

### Re: Sapling

en is the abbreviation for the ligand Ethylenediamine
Sat Dec 05, 2020 5:20 pm
Forum: Naming
Topic: Order of Ligands/naming
Replies: 28
Views: 128

### Re: Order of Ligands/naming

name the ligands first in alphabetical order then the metal
Sat Dec 05, 2020 5:15 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: strong vs weak
Replies: 10
Views: 73

### Re: strong vs weak

strong acids need to dissociate easily in their solution so they will have weaker bonds than weak acids
Sat Nov 28, 2020 1:21 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number
Replies: 13
Views: 69

### Re: coordination number

The [Fe(CN)6]-4 has a coordination number of 6 because it is octahedral shape with the Fe at the center meaning it has 6 bonds connecting to the central atom
Sat Nov 28, 2020 1:18 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Bracket Notation
Replies: 4
Views: 43

### Re: Bracket Notation

you are correct the charge goes outside the bracket
Sat Nov 28, 2020 1:11 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ring Structures
Replies: 9
Views: 54

### Re: Ring Structures

Lavelle said he goes through all the sapling problems so I would assume that if it is on the sapling we need to know it
Sat Nov 28, 2020 1:04 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination number
Replies: 9
Views: 63

### Re: Coordination number

double bonds count as 2 when finding coordination number
Sat Nov 28, 2020 12:42 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 6
Views: 60

### Re: Ligands

A ligand is a lewis base or something that donates a lone pair in order to form a coordinate covalent bond with the center metal atom of a complex. The ligands themselves are not the central atom of the complex
Sun Nov 22, 2020 3:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling #4
Replies: 5
Views: 39

### Re: Sapling #4

as said above sea saw shape is similar to trigonal bipyramidal except one atom is replaced with a lone pair making it 4 atoms and 1 lone pair
Sun Nov 22, 2020 3:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair E-
Replies: 47
Views: 255

### Re: Lone Pair E-

lone pairs do count as their own region of electron density
Sun Nov 22, 2020 3:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Tetrahedral vs. Square Planar
Replies: 4
Views: 39

### Re: Tetrahedral vs. Square Planar

if the molecule has only 4 regions of electron densities around it it will be tetrahedral but if it has 6 regions of electron density (2 lone pairs) then it will be square planar
Sun Nov 22, 2020 3:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Visualizing VSEPR Shapes
Replies: 5
Views: 36

### Re: Visualizing VSEPR Shapes

i agree drawing your the molecular geometry using the dashed lines and wedges helps
Sun Nov 22, 2020 3:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polarity examples
Replies: 5
Views: 53

### Re: polarity examples

when the cl molecules are on opposite sides of the molecule the dipoles will cancel out which makes the molecule polar
Sat Nov 14, 2020 8:45 pm
Forum: Dipole Moments
Topic: Textbook 3F #13
Replies: 3
Views: 36

### Re: Textbook 3F #13

it is II because it is lined up so that the white and green atoms are closest to each other and therefore have the highest attraction
Sat Nov 14, 2020 8:40 pm
Forum: Dipole Moments
Topic: H-Bond acceptor
Replies: 9
Views: 68

### Re: H-Bond acceptor

the hydrogen bond acceptor does not need to be attached to a hydrogen
Sat Nov 14, 2020 8:35 pm
Forum: Dipole Moments
Topic: Sapling #19
Replies: 12
Views: 72

### Re: Sapling #19

it should say so2 not h2s
Sat Nov 14, 2020 8:32 pm
Forum: Bond Lengths & Energies
Topic: Sapling HW Bond Length
Replies: 7
Views: 53

### Re: Sapling HW Bond Length

s is below o on the periodic table meaning that the atomic radius is larger and therefore the bond length is larger
Sat Nov 14, 2020 8:30 pm
Forum: Bond Lengths & Energies
Topic: Size
Replies: 13
Views: 158

### Re: Size

bonds become weaker the longer they are
Sat Nov 07, 2020 2:02 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge of the Same Element
Replies: 15
Views: 60

### Re: Formal Charge of the Same Element

i agree each atom in a molecule has its own formal charge
Sat Nov 07, 2020 1:58 pm
Forum: Formal Charge and Oxidation Numbers
Topic: What do we use formal charges for?
Replies: 15
Views: 51

### Re: What do we use formal charges for?

formal charges are used to determine which lewis structure is most stable
Sat Nov 07, 2020 1:57 pm
Forum: Resonance Structures
Topic: resonance structures
Replies: 8
Views: 64

### Re: resonance structures

resonance structures are used because one lewis structure is not always good enough to represent a molecule
Sat Nov 07, 2020 1:51 pm
Forum: Resonance Structures
Topic: Oxidation Number
Replies: 9
Views: 55

### Re: Oxidation Number

oxidation number is the charge of specific atoms that make up the compound which shows how many electrons each atom has gained or lossed when forming bonds
Sat Nov 07, 2020 1:42 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Charges on Individual Atoms
Replies: 3
Views: 31

### Re: Charges on Individual Atoms

it is preferable to have more formal charges of zero because it means that the structure is more stable
Fri Oct 30, 2020 5:38 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: l=4
Replies: 13
Views: 85

### Re: l=4

for what we are learning i think it is safe to keep l at 0-3
Fri Oct 30, 2020 5:35 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Plane Importance
Replies: 9
Views: 50

### Re: Nodal Plane Importance

since electrons are not found in the plane, they help create an outline to the shape of the orbital by showing where the electrons are allowed.
Fri Oct 30, 2020 5:25 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: d orbitals
Replies: 17
Views: 97

### Re: d orbitals

basically the d subshell has 4 orbitals which follow the clover shape on the dxy, dxz, dyz , and dx^2-y^2 and 1 orbital on the dz^2 which looks like 2 lobes with a ring
Fri Oct 30, 2020 5:17 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Quick Question about Wave Functions and their Definition
Replies: 3
Views: 32

### Re: Quick Question about Wave Functions and their Definition

psi squared is proportional to the probability of finding a particle given by psi at a point and time
Fri Oct 30, 2020 5:08 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: SAPLING #20
Replies: 4
Views: 51

### Re: SAPLING #20

nitrogen is more stable due to its half filled orbital meaning that oxygen wants to give away its electron to become more stable due to electron electron repulsion which is why its ionization energy is lower
Fri Oct 23, 2020 2:46 pm
Forum: DeBroglie Equation
Topic: Sapling Question 29
Replies: 6
Views: 56

### Re: Sapling Question 29

Brandon Le 3C wrote:What would we plug into for mass if we are only given the length of the E.coli bacterium (1.7 μm)?

if you are referring to the equation Ek = 1/2 mv^2 then we would use the mass of an electron 9.11x10^-31 kg
Fri Oct 23, 2020 2:36 pm
Forum: DeBroglie Equation
Topic: Rearranging De Broglie Equation
Replies: 17
Views: 116

### Re: Rearranging De Broglie Equation

You want to rearrange the equation to isolate the v which can be done simply by multiplying both sides by v and dividing both sides by λ to get v=h/mλ
Fri Oct 23, 2020 2:30 pm
Forum: DeBroglie Equation
Topic: Smallest Measurable Wavelength
Replies: 7
Views: 58

### Re: Smallest Measurable Wavelength

can confirm that wavelength less than 10^-15 m cannot be observed
Fri Oct 23, 2020 2:28 pm
Forum: DeBroglie Equation
Topic: Light and momentum
Replies: 7
Views: 58

### Re: Light and momentum

The equation E=pc shows how momentum p and energy E are related where c is the speed of light.
Fri Oct 23, 2020 2:21 pm
Forum: DeBroglie Equation
Topic: De Broglie Equation v. Speed of Light Equation
Replies: 14
Views: 101

### Re: De Broglie Equation v. Speed of Light Equation

Yes, put simply, De Broglie Equation is used on things with mass while Speed of Light is used on photons which are massless.
Fri Oct 16, 2020 12:10 am
Forum: Einstein Equation
Topic: Einstein Equation
Replies: 10
Views: 223

### Re: Einstein Equation

h is planck's constant which is always 6.62607015×10−34 js and v is the frequency which is how often a wave passes a given point per second.
Fri Oct 16, 2020 12:02 am
Forum: Properties of Electrons
Topic: Combining Equations
Replies: 10
Views: 98

### Re: Combining Equations

E=hv and c=λv Basically if you need to find E but only have λ you can use λ to solve for v by rearranging the equation c=λv to c/λ=v then plugging that value of v into E=hv. If you want to make it quicker you can just replace the v with c/λ to get the equation you asked about.
Thu Oct 15, 2020 11:55 pm
Forum: Properties of Electrons
Topic: protons and electrons
Replies: 33
Views: 191

### Re: protons and electrons

when determining mass protons and neutrons are almost the same and the weight of electrons is basically negligible
Thu Oct 15, 2020 11:53 pm
Forum: Einstein Equation
Topic: m vs nm
Replies: 66
Views: 413

### Re: m vs nm

I prefer to put the answer in nanometers since it just easier to read rather rather than reading it in meters way past the decimal.
Thu Oct 15, 2020 11:51 pm
Forum: Einstein Equation
Topic: Equation Sheet
Replies: 15
Views: 131

### Re: Equation Sheet

I believe that we will be given the constants and equations on the test however I think you will generally memorize them as you are learning and doing problems with them.
Wed Oct 07, 2020 11:59 am
Forum: Balancing Chemical Reactions
Topic: butane balancing equation question
Replies: 6
Views: 93

### Re: butane balancing equation question

Everything in the equation is a gas so you just need to find how many more moles were produced from the reactants(30) to the products(36). To do this we take the difference which is 36-30=6
Wed Oct 07, 2020 11:46 am
Forum: Limiting Reactant Calculations
Topic: Limiting reactants
Replies: 8
Views: 80

### Re: Limiting reactants

If you have the perfect ratio of reactants which matches the balanced equation then there will be no left over reactants and either reactant can be used to find the amount of product since they will both give you the same answer.
Wed Oct 07, 2020 11:40 am
Forum: Molarity, Solutions, Dilutions
Topic: mmol/mL vs. mol/L
Replies: 6
Views: 70

### Re: mmol/mL vs. mol/L

When you are diluting with the equation m1v1 = m2v2 you can also use units like milliliters to solve the problem as long as you use it on both sides. If you are trying to solve for volume then putting in milliliters just gives you the answer in milliliters.
Wed Oct 07, 2020 11:23 am
Forum: SI Units, Unit Conversions
Topic: Conversion of grams to moles and millimoles to moles.
Replies: 9
Views: 101

### Re: Conversion of grams to moles and millimoles to moles.

For converting the moles to millimoles my hs chem teacher taught us to use King Henry Died Monday Drinking Chocolate Milk which makes the acronym KHDMDCM which also stands for kilo hecto deca (moles in this case but can be substituted for any unit) deci centi milli. Each movement right is a multipli...
Wed Oct 07, 2020 11:07 am
Forum: SI Units, Unit Conversions
Topic: Rounding in Between Steps [ENDORSED]
Replies: 22
Views: 202

### Re: Rounding in Between Steps[ENDORSED]

Follow-up question, I completely agree that in order to maintain accuracy we should wait until the final step to round. Let's say you were doing a multi-step problem with lots of calculations, would you agree that after each set of calculations it would be best to round to the correct number of sig...