I'm not sure if we have to memorize this for the test but here is a vid that would help you out
https://www.youtube.com/watch?v=G01ybx24hJg
-Jimmy Lira 1G
Search found 61 matches
- Sun Jun 10, 2018 11:06 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric Oxides
- Replies: 4
- Views: 727
Re: Naming
I believe it is 72 and 90 degrees
check out this link!
https://chemistryonline.guru/hybridization-sp3d3/
-Jimmy Lira 1g
check out this link!
https://chemistryonline.guru/hybridization-sp3d3/
-Jimmy Lira 1g
- Sun Jun 10, 2018 11:01 pm
- Forum: Polyprotic Acids & Bases
- Topic: ligand bonds
- Replies: 2
- Views: 640
Re: ligand bonds
Writing it in this order shows which element is going to be bonded by the metal; your question is somewhat unclear but I hope this answers your question!
-Jimmy Lira 1G
-Jimmy Lira 1G
- Sat Jun 09, 2018 12:06 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand shape
- Replies: 2
- Views: 360
Ligand shape
If a molecule forms a ring structure with a ligand and metal does that always mean this ring shape is a polydentate ligand??
-Jimmy Lira 1G
-Jimmy Lira 1G
- Sat Jun 09, 2018 11:50 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand bind to metal
- Replies: 2
- Views: 363
Ligand bind to metal
Can a ligand bind to a metal if it has a double bond? In section we discussed how it is harder for double bonds to stretch and rotate to bind to a specific metal, does that mean all double bonds don't bind to metals?
-Jimmy Lira 1 G
-Jimmy Lira 1 G
- Sat Jun 09, 2018 11:39 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Difference
- Replies: 1
- Views: 396
Difference
What is the difference between pKA and KA for in terms of acidity?
-Jimmy Lira 1G
-Jimmy Lira 1G
- Sun Jun 03, 2018 8:19 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pairs
- Replies: 7
- Views: 778
Re: Lone pairs
To answer your question: "Lone pairs have the greatest repelling effect because they are closer to the nucleus of the central atom compared to the bonding pairs, therefore they repel other lone pairs greater compared to bonding pairs. Bonding pairs have a bond between the nucleus of the central...
- Sun Jun 03, 2018 8:14 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pairs
- Replies: 5
- Views: 648
Re: Lone pairs
To see more details about lone pairs and how they affect bond angles check out this file!
-Jimmy Lira 1G
-Jimmy Lira 1G
- Sun Jun 03, 2018 8:10 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Ch 4 clarification
- Replies: 2
- Views: 483
Re: Ch 4 clarification
So when describing the structure in terms of hybrid orbitals it is referring to hybridization where you would 1. Look at the atom. 2. Count the number of atoms connected to it (not bonds – atoms). 3. Count the number of lone pairs attached to it. 4. Add these two numbers together. 5. put this number...
- Sun Jun 03, 2018 8:03 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bonds
- Replies: 2
- Views: 431
Bonds
How are anti-bonding orbitals and bonding orbitals created/formed?
-Jimmy Lira 1G
-Jimmy Lira 1G
- Thu May 31, 2018 6:56 pm
- Forum: Hybridization
- Topic: Hybridization exceptions
- Replies: 1
- Views: 855
Hybridization exceptions
I was just wondering if there are any exceptions to hybridization of molecules? Also, will we see anything bigger than an octahedral (sp3d2) on the test?
-Jimmy Lira 1G
-Jimmy Lira 1G
- Wed May 30, 2018 2:30 pm
- Forum: Hybridization
- Topic: Hybrid
- Replies: 1
- Views: 292
Hybrid
Are the # of regions of e- density always the same as the # of hybrid orbitals?
-Jimmy Lira 1G
-Jimmy Lira 1G
- Sun May 27, 2018 11:19 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Ionisation [ENDORSED]
- Replies: 2
- Views: 678
Re: Ionisation [ENDORSED]
So I looked up your question and did some research and found link that is really helpful check it out !!
https://courses.lumenlearning.com/chemi ... constants/
-Jimmy Lira 1g
https://courses.lumenlearning.com/chemi ... constants/
-Jimmy Lira 1g
- Sun May 27, 2018 11:13 pm
- Forum: Resonance Structures
- Topic: Resonance [ENDORSED]
- Replies: 5
- Views: 912
Re: Resonance [ENDORSED]
I believe that this means which has more resonance structures . So whichever has more structures that contribute to resonance has the most resonance .
-Jimmy Lira 1G
-Jimmy Lira 1G
- Sun May 27, 2018 11:06 pm
- Forum: Octet Exceptions
- Topic: Expanded Octet
- Replies: 2
- Views: 562
Re: Expanded Octet
As stated above , yes it is because of the d orbital as the d contains 10 , so these elements can have an expanded octet as they can have the d orbital
-Jimmy Lira 1g
-Jimmy Lira 1g
- Sun May 27, 2018 11:00 pm
- Forum: Dipole Moments
- Topic: Dipole
- Replies: 4
- Views: 610
Dipole
Which effects dipole more radius size or ionization ? Or do these factors not effect dipole ? Only electronegativity effects dipole ?
-Jimmy Lira 1g
-Jimmy Lira 1g
- Sat May 26, 2018 3:48 pm
- Forum: Ionic & Covalent Bonds
- Topic: Group 17
- Replies: 2
- Views: 444
Group 17
For group 17 elements, I understand that they can only form one bond with other elements since they already have 7 electrons; however, is there any exceptions that would allow group 17 elements to obtain a double bond or triple bond? Just curious
-Jimmy Lira 1g
-Jimmy Lira 1g
- Mon May 21, 2018 8:47 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Order
- Replies: 4
- Views: 610
Bond Order
What equation do we use to find bond order, as it relates to bond length?
Like I know the higher the bond order the shorter the bond length
-Jimmy Lira 1G
Like I know the higher the bond order the shorter the bond length
-Jimmy Lira 1G
- Sun May 20, 2018 11:28 pm
- Forum: Resonance Structures
- Topic: Double bonds
- Replies: 3
- Views: 610
Re: Double bonds
Your question is kind of confusing, but I'm going to attempt to help you out! So double bonds are used simply when they are needed to fill the octet rule and shelves of certain combinations of elements. Whether the molecules are large or small, double bonds are used to fulfill the octet rule and mak...
- Sun May 20, 2018 11:14 pm
- Forum: Electronegativity
- Topic: Electronegativiry vs electron affinity [ENDORSED]
- Replies: 4
- Views: 960
Re: Electronegativiry vs electron affinity [ENDORSED]
I found a couple of sources which could answer your question, check these links out! https://socratic.org/questions/what-is-the-difference-between-electronegativity-and-electron-affinity "1. Electronegativity is a numerical value associated with an atoms ability to form a covalent bond 2. Elect...
- Sun May 20, 2018 11:11 pm
- Forum: Properties of Electrons
- Topic: Midterm #2 question 4a,b
- Replies: 5
- Views: 783
Midterm #2 question 4a,b
For question 4 on Midterm 2 it asks to find the wavelength of the ejected electron, which I knew how to do; however 4b asks "can the wavelike properties of ejected electrons in part A be detected?" and this question threw me off can someone explain the conceptual answer to this question; d...
- Sun May 20, 2018 8:33 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Order of Increasing Polarization
- Replies: 2
- Views: 432
Re: Order of Increasing Polarization
More shells means that these electrons are easier to be taken away , thus more polarizability.
Also , polarizing power is the power to take electrons , while polarization is the ability to let go of your electrons .
-Jimmy Lira 1g
Also , polarizing power is the power to take electrons , while polarization is the ability to let go of your electrons .
-Jimmy Lira 1g
- Thu May 17, 2018 6:54 pm
- Forum: Electronegativity
- Topic: Connection
- Replies: 3
- Views: 532
Connection
How are polarizability and electronegativity connected? Which effects which?
-Jimmy Lira 1G
-Jimmy Lira 1G
- Wed May 16, 2018 4:01 pm
- Forum: Bond Lengths & Energies
- Topic: exceptions
- Replies: 1
- Views: 312
exceptions
Are there any exceptions to the bond length and energy rules that we went over in class today ?
-Jimmy Lira 1g
-Jimmy Lira 1g
- Sun May 13, 2018 8:32 pm
- Forum: Lewis Structures
- Topic: Cations and Anions
- Replies: 3
- Views: 659
Re: Cations and Anions
Yes, it is possible the lewis structure would be placed in brackets with the correct cation or anion. This should help: http://butane.chem.uiuc.edu/pshapley/GenChem2/A1/2.html "By convention, the cation goes before the anion in a formula. Write out the Lewis structure of each atom or ion separa...
- Sun May 13, 2018 8:20 pm
- Forum: Electronegativity
- Topic: Helium
- Replies: 2
- Views: 1120
Re: Helium
I just answered this previously check this out abetterchemtext.com/Periodicity/exceptions.htm "This is the easiest of the exceptions. We have said that electronegativity increases to the right. This is true except that the trend does NOT include the noble gases. That means that fluorine has the...
- Sun May 13, 2018 8:19 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Fornal Charge Exceptions?
- Replies: 1
- Views: 493
Re: Fornal Charge Exceptions?
I think I may have found one check this link out http://www.chem.ucla.edu/~harding/tutorials/formalcharge.pdf "(The rare exception is a pure covalent bond between two identical atoms such as in molecular chlorine, Cl-Cl.) Because of this uneven sharing atoms have fractional, rather than integer...
- Tue May 08, 2018 9:42 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization
- Replies: 1
- Views: 349
Ionization
How do the ionization trends work for the periodic table ? For 1st ionization ? For 2nd ionization ?
For finding greatest or least of ionization
-Jimmy Lira 1G
For finding greatest or least of ionization
-Jimmy Lira 1G
- Tue May 08, 2018 3:36 pm
- Forum: Trends in The Periodic Table
- Topic: Increasing Ionic radius
- Replies: 2
- Views: 432
Increasing Ionic radius
What do the anions have to do with the organization of the ionic radius
for example
order these :
s^2- , cl-, p^3-
Answer : p^3-, s^2-, cl-
How do I organize by increasing ionic radius with regard to the anions ?
-Jimmy Lira 1G
for example
order these :
s^2- , cl-, p^3-
Answer : p^3-, s^2-, cl-
How do I organize by increasing ionic radius with regard to the anions ?
-Jimmy Lira 1G
- Mon May 07, 2018 7:17 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Ground state elec. config.
- Replies: 3
- Views: 353
Ground state elec. config.
Give the ground state electron configuration for the following:
Sn^ 4+
- I did this practice problem, but I got
[Kr]5s^2 5p^2 4d^10
However i know we have to take away the 4+ , but how do I know which to take it from ? why can't I take it away from the d ?
the answer is [Kr]4d^10
Jimmy Lira 1-G
Sn^ 4+
- I did this practice problem, but I got
[Kr]5s^2 5p^2 4d^10
However i know we have to take away the 4+ , but how do I know which to take it from ? why can't I take it away from the d ?
the answer is [Kr]4d^10
Jimmy Lira 1-G
- Sun May 06, 2018 11:24 pm
- Forum: Ionic & Covalent Bonds
- Topic: van der waals forces [ENDORSED]
- Replies: 3
- Views: 425
van der waals forces [ENDORSED]
Will we need to know about van der waals forces? If so can somone explain how these forces work and if they are stronger than ionic or covalent bonds? Where would these forces apply in chem ?
-Jimmy Lira 1 G
-Jimmy Lira 1 G
- Sun May 06, 2018 11:18 pm
- Forum: Properties of Light
- Topic: Test 2 Question 4
- Replies: 8
- Views: 884
Re: Test 2 Question 4
To further explain , it is from n=x to n=2 You would use the wav= h/m*v put this into terms of v and solve using 700nm given for wavelength then when v is found find energy E=hv after this En=-hR/n^2 , put in terms of n and solve when you get n then use the En=-hR/n^2 equation again with that n foun...
- Sun May 06, 2018 9:32 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 3d before 4s
- Replies: 9
- Views: 1055
Re: 3d before 4s
Your question is unclear, but I do believe your statement is true , and the only exceptions are Cr and Cu, as I remember him saying that in lecture ;hope this helps https://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Electronic_Structure_of_Atoms_and_Molecules/Electronic_Configuratio...
- Sun May 06, 2018 9:22 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent vs. Ionic
- Replies: 3
- Views: 491
Re: Covalent vs. Ionic
They are significantly different. Cavelent bonds are bonds formed between 2 nonmetals , which share their electrons to become stable. It is chemical bonding Ionic bonds are bonds formed between a nonmetal and metal ; nonmetals are stronger than metals and can get electrons from the metal. It is an e...
- Wed May 02, 2018 5:41 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 2.25 hw
- Replies: 2
- Views: 375
2.25 hw
For 2.29 it gives orbitals and the block of the orbital for example 4p orbital It asks how many electrons are available at this orbital? I got 6 electrons for 4p, but I'm not sure if I did this right can somone explain the correlation of orbitals and blocks to electron availability ? I used the peri...
- Wed May 02, 2018 4:44 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: hw qs 2.19
- Replies: 1
- Views: 261
hw qs 2.19
I'm confused on where the 6d subshell (n=7) came from is it given ? Also, do I use ml= l,l-1,...-l to find how many ml values a 6d subshell has?
-Jimmy Lira1-G
-Jimmy Lira1-G
- Wed May 02, 2018 2:05 pm
- Forum: Trends in The Periodic Table
- Topic: Decrease across a period
- Replies: 3
- Views: 340
Decrease across a period
Why do the elements in the periodic table cause a decrease across a period of ionic radius? I understand they decrease, but why do the specific elements cause this ?
-Jimmy Lira 1G
-Jimmy Lira 1G
- Mon Apr 30, 2018 12:02 am
- Forum: *Shrodinger Equation
- Topic: Energy equation
- Replies: 1
- Views: 374
Energy equation
for
energy of photon -threshold = kinetic energy
if we have to solve for kinetic do we use
e= 1/2 mv^2 or do we just use energies that are gven in the problem ??
-Jimmy Lira- 1g
energy of photon -threshold = kinetic energy
if we have to solve for kinetic do we use
e= 1/2 mv^2 or do we just use energies that are gven in the problem ??
-Jimmy Lira- 1g
- Mon Apr 30, 2018 12:00 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: test
- Replies: 3
- Views: 426
test
for the test we took there was a problem that gave us the type of light and said to find resting and excited states of n and calculate n , how would this be solved without knowing the value of n??
-Jimmy Lira -1g
-Jimmy Lira -1g
- Sun Apr 29, 2018 11:58 pm
- Forum: DeBroglie Equation
- Topic: work threshold
- Replies: 1
- Views: 309
work threshold
for threshold or work when solving for it can we use
wavlength= hc/ work ??
I have seen many people do this but still confused
-Jimmy Lira 1-g
wavlength= hc/ work ??
I have seen many people do this but still confused
-Jimmy Lira 1-g
- Sun Apr 29, 2018 11:57 pm
- Forum: Properties of Electrons
- Topic: ejecting electrons
- Replies: 4
- Views: 492
Re: ejecting electrons
wavelenght does but amplitude doesn't, so shortning the wavlenght will help ejection but amplitude will have no effect
-Jimmy Lira 1-g
-Jimmy Lira 1-g
- Sun Apr 29, 2018 11:51 pm
- Forum: Trends in The Periodic Table
- Topic: S and d orbitals [ENDORSED]
- Replies: 2
- Views: 405
Re: S and d orbitals [ENDORSED]
4s orbitals have lower energy than 3d , so 4s are filled first ; 4s electrons are lost first during ionization so the 4s orbitals must have a higher energy then 3d orbitals which is why 3d comes after 4s Here's a helpful link https://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Electr...
- Sun Apr 29, 2018 11:43 pm
- Forum: Properties of Electrons
- Topic: Question about n and energy levels
- Replies: 3
- Views: 430
Re: Question about n and energy levels
The n refers to the number of shelves ^ as stated above and can be applied to the lyman series n ≥ 2 to n = 1 (where n is the principal quantum number) and balmer series n ≥ 3 to n = 2
It can be applied to the rydberg equation
- Jimmy Lira 1-G
It can be applied to the rydberg equation
- Jimmy Lira 1-G
- Sun Apr 22, 2018 11:45 pm
- Forum: Properties of Electrons
- Topic: properties of electrons
- Replies: 1
- Views: 416
Re: properties of electrons
Well Danny, A standing wave intereferes with itself, (constructively), so it doesn't show acceleration and no loss of energy Non standing waves are deconstructive, showing acceleration and loss of energy this should help: https://www.lucamoroni.it/simulations/standing-waves-in-bohrs-atomic-model/ It...
- Sun Apr 22, 2018 11:32 pm
- Forum: Einstein Equation
- Topic: Graph using einstein equation
- Replies: 2
- Views: 293
Graph using einstein equation
I saw a question on review that asked: Draw a graph comparing the inverse wavelength of a photon versus the energy of photon (label axis) - I understand that the einstein equation us used and the equation to graph is E= hc/wavelength, however I was unclear how they graphed a line from this equation,...
- Sun Apr 22, 2018 11:20 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty equation [ENDORSED]
- Replies: 3
- Views: 432
Uncertainty equation [ENDORSED]
The equation is
change P x change X >= h/4pi
I understand how to use the equation, but was uncertain on why the pi is used in this equation, can someone please clarify?
-Jimmy Lira 1G
change P x change X >= h/4pi
I understand how to use the equation, but was uncertain on why the pi is used in this equation, can someone please clarify?
-Jimmy Lira 1G
- Sun Apr 22, 2018 11:13 pm
- Forum: DeBroglie Equation
- Topic: question 1.41
- Replies: 1
- Views: 141
question 1.41
For hw question 1.41 , I used debrogile equation, however I was confused on the mass of a neutron, it isn't given , so is this common information we need to know ? If so I didn't know which mass of a neutron to use as the internet had different amounts for the neutron I found 1.6749 x 10-27 kg. do i...
- Sun Apr 22, 2018 11:04 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Memorizing spectrum
- Replies: 5
- Views: 727
Re: Memorizing spectrum
Well Marina, you can memorize it and this will help https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=2ahUKEwiNsLC328_aAhVJ3GMKHZuPD3gQjRx6BAgAEAU&url=https%3A%2F%2Fcommons.wikimedia.org%2Fwiki%2FFile%3AEM_Spectrum_Properties_edit.svg&psig=AOvVaw0s...
- Sun Apr 22, 2018 10:48 pm
- Forum: DeBroglie Equation
- Topic: How do you calculate speed using the De Broglie equation? [ENDORSED]
- Replies: 6
- Views: 4086
Re: How do you calculate speed using the De Broglie equation? [ENDORSED]
Just to clarify,
wavelength= h / m
h= plancks constant 6.626 x 10^-34 j s
m= momentum= velocity x mass
so
m= h/ wavelength
velocity= h/ wavelength / mass
- Jimmy lira 1g
wavelength= h / m
h= plancks constant 6.626 x 10^-34 j s
m= momentum= velocity x mass
so
m= h/ wavelength
velocity= h/ wavelength / mass
- Jimmy lira 1g
- Sun Apr 15, 2018 11:03 pm
- Forum: Properties of Light
- Topic: Wave particle duality
- Replies: 3
- Views: 194
Wave particle duality
If there are waves in constructive or destructive interference is there a limit to the amount of waves that can be joined together? Can there be more than 2 waves joined for these interferences to occur, if so do the wavelengths create like a mean wavelength overall, not speaking about amplitude, bu...
- Sun Apr 15, 2018 10:53 pm
- Forum: Properties of Light
- Topic: Series of light
- Replies: 4
- Views: 451
Series of light
I'm confused on what the difference is between the Lyman series and the Balmer series, I kind of understand it, but I just need clarification on the differences? Does the Balmer series in the ultraviolet region of the spectrum?
-Jimmy Lira 1-G
-Jimmy Lira 1-G
- Sun Apr 15, 2018 10:47 pm
- Forum: Properties of Light
- Topic: Wavelength [ENDORSED]
- Replies: 9
- Views: 1112
Wavelength [ENDORSED]
Does wavelength have to be from peak to peak, because I saw many example from the book where the wavelength wasn't exactly peak to peak but a certain place on the wave to another certain place?
-Jimmy Lira 1-G
-Jimmy Lira 1-G
- Sun Apr 15, 2018 10:44 pm
- Forum: Properties of Electrons
- Topic: Geiger -Marsden experiment [ENDORSED]
- Replies: 5
- Views: 611
Geiger -Marsden experiment [ENDORSED]
What was the importance of the Geiger -Marsden experiment in terms of electrons, protons, neutrons?
-Jimmy Lira 1-G
-Jimmy Lira 1-G
- Sun Apr 15, 2018 10:30 pm
- Forum: Properties of Light
- Topic: Equations in Quantum
- Replies: 2
- Views: 251
Equations in Quantum
What did professor Lavelle mean by equations in Quantum mechanics have variables that are quantized , or discrete ?
-Jimmy Lira 1-G
-Jimmy Lira 1-G
- Sun Apr 15, 2018 10:24 pm
- Forum: Properties of Light
- Topic: Bright Lines and the Atomic Spectra
- Replies: 2
- Views: 245
Re: Bright Lines and the Atomic Spectra
Does this mean that other light is emitted but red is the brightest because when the excited hydrogen atoms give off em radiation, 656nm em radiation is the most prevalent? To answer your question, when the excited hydrogen atoms give off em radiation at 656nm em radiation the only color present is ...
- Sun Apr 15, 2018 10:11 pm
- Forum: Properties of Light
- Topic: Difference between wave model and particle model? [ENDORSED]
- Replies: 6
- Views: 14911
Re: Difference between wave model and particle model? [ENDORSED]
Re: Difference between wave model and particle model?
There are many differences among the wave and particle model, I found a comparison chart that might help with your dilema.
-Jimmy Lira -1G
There are many differences among the wave and particle model, I found a comparison chart that might help with your dilema.
-Jimmy Lira -1G
- Sun Apr 15, 2018 10:04 pm
- Forum: Properties of Light
- Topic: Photoelectric Effect
- Replies: 1
- Views: 157
Re: Photoelectric Effect
Why was it important for scientists to undergo this experiment? What questions led to their conclusion and what real contribution did they expect to make with their initial hypothesis? To answer your question , the photoelectric experiment was very important as it is used now to determine electron e...
- Sun Apr 15, 2018 9:57 pm
- Forum: Properties of Light
- Topic: The Electromagnetic spectrum
- Replies: 5
- Views: 480
Re: The Electromagnetic spectrum
Do we have to memorize the spectrum if not how do we calculate its energy in order? I'm not really sure we have to memorize the spectrum, but I feel it would be very helpful. To answer your question, to calculate the energy first use (c = λ × ν), then after finding the frequency use Plank's equation...
- Sun Apr 08, 2018 11:59 pm
- Forum: Empirical & Molecular Formulas
- Topic: f11
- Replies: 3
- Views: 399
Re: f11
Hello danny ! Well this is quite simple actually, you probably missed the example showing how to do this process; if the mass percentage is 65.5% the the mass percentage into grams is simply 65.5g , it is exactly the percentage without the % symbol, hope thats helpful !!!
- Sun Apr 08, 2018 11:47 pm
- Forum: Balancing Chemical Reactions
- Topic: Fractions in chemical equations [ENDORSED]
- Replies: 5
- Views: 1895
Fractions in chemical equations [ENDORSED]
I don't understand why we can't leave fractions in front of a element in a chemical equation when balancing; why is it required to get rid of fractions, is there a scientific reason for this or just simply so that the ratios of the balanced chemical equation have whole #s? \
-Jimmy Lira- 1G
-Jimmy Lira- 1G
- Sun Apr 08, 2018 11:45 am
- Forum: Empirical & Molecular Formulas
- Topic: Homework Problem F9
- Replies: 2
- Views: 364
Re: Homework Problem F9
Yes, it is asking to find the empirical formula from the mass percentages of Vanillin. They give you mass percentages of 63.15% C, 5.30% H, and 31.55% O. The mass percentage of each element X, m(X), in exactly 100g of the compound is equal to its mass percentage in grams; so 63.15% is 63.15g and so ...