Search found 68 matches
- Sat Mar 16, 2019 7:36 pm
- Forum: General Rate Laws
- Topic: 6th edition 15.13
- Replies: 1
- Views: 464
Re: 6th edition 15.13
In the solutions manual they make it more difficult to see the different steps involved since they combine it all but all you have to do for part (a) is convert H2 and I2 to moles and then convert them to a molar concentration by dividing the number of moles obtained for each by the volume 0.750 L. ...
- Sat Mar 16, 2019 7:29 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: lnA
- Replies: 2
- Views: 339
Re: lnA
I’m pretty sure that’s the only real purpose of it because the equation is meant to be visualized on a graph.
- Sat Mar 16, 2019 7:26 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q VS. K
- Replies: 13
- Views: 1657
Re: Q VS. K
When Q>K think of drawing a little pac man guy off the greater than sign and his mouth is going towards the reactants so the reaction favors reactants and if Q<K draw the pac man going towards the products side so the reaction favors the formation of products. Silly tip but useful.
- Sat Mar 16, 2019 7:23 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Ka stuff
- Replies: 2
- Views: 502
Re: Ka stuff
If you are talking about the equation Ka= [H3O+][A-]/[HA] I don’t think it necessarily has to be memorized but if you just think about it like other problems with the equilibrium constant, K, it’s just products over reactants which you can tell from the reaction of the acid you are given.
- Sat Mar 16, 2019 7:14 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Question 9.19
- Replies: 1
- Views: 490
Question 9.19
In the question you are calculating the standard entropy of vaporization of water at 85 degrees C, given that it’s standard entropy of vaporization is 100 degreees C. The three steps you sum together are: 1. the entropy change heat the reactants to 100 C 2. the entropy of vaporization of h2o at 100 ...
- Fri Mar 15, 2019 4:44 pm
- Forum: General Science Questions
- Topic: Standard Conditions/ Standard Temperature
- Replies: 2
- Views: 549
Re: Standard Conditions/ Standard Temperature
25 degrees C is usually used in a lot of the problems though since this is just room temperature
- Fri Mar 15, 2019 4:43 pm
- Forum: General Science Questions
- Topic: Standard Conditions/ Standard Temperature
- Replies: 2
- Views: 549
Re: Standard Conditions/ Standard Temperature
0 degreees celsius
- Fri Mar 15, 2019 4:31 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: coefficient in rate law
- Replies: 1
- Views: 327
Re: coefficient in rate law
What number is this in the book?
- Fri Mar 15, 2019 4:24 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Test 2 help!
- Replies: 3
- Views: 470
Re: Test 2 help!
You use the Van’t Hoff equation to find the pH based on the information given and then you compare this pH you get to pH 7. If the pH is below 7 then pH would be basic and if it’s above 7 then a pH of 7 would be relatively acidic.
- Fri Mar 15, 2019 4:12 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Question 8.63
- Replies: 1
- Views: 458
Question 8.63
This is a question finding the standard enthalpies of formation where you look at the bonds broken an formed. For part c) it says 3 mol CRC bonds are formed. What is a CRC bond? also what does it mean when it says “atomize”?
- Thu Mar 14, 2019 11:46 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Question 15.9 Comparing Experiments
- Replies: 3
- Views: 639
Re: Question 15.9 Comparing Experiments
The more I look at it I think they are actually comparing experiments 1 and 3 which would then make perfect sense. If anyone can confirm this?
- Thu Mar 14, 2019 11:38 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Question 15.9 Comparing Experiments
- Replies: 3
- Views: 639
Question 15.9 Comparing Experiments
For Question 15.9, I understand how to find the order of A you compare the experiments where the values are the same for [B] and [C] but different for [A] but I don’t get when you are trying to find the order of [B] how to correctly decide which experiments to compare? The book compared experiments ...
- Sun Mar 10, 2019 10:05 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius plot
- Replies: 4
- Views: 462
Re: Arrhenius plot
It allows us to analyze the effect of temperature on the rates of chemical reactions
- Sun Mar 10, 2019 9:53 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Unique Rate of a Reaction
- Replies: 2
- Views: 322
Unique Rate of a Reaction
Can someone please clarify the unique rate of reaction specifically for question 15.3 part c?
- Sun Mar 10, 2019 9:50 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Rate vs. Initial Rate
- Replies: 4
- Views: 792
Rate vs. Initial Rate
What is the difference in solving a problem that asks for the initial rate vs. one that just ask to find the rate?
- Thu Feb 28, 2019 8:14 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 14.9 ch 14
- Replies: 3
- Views: 420
Re: 14.9 ch 14
Okay so I just realized the cell potential for Cu is given so then you just plug in:
-0.689 V=E(cathode)-(0.34V)
to get the reduction potential of the anode
-0.689 V=E(cathode)-(0.34V)
to get the reduction potential of the anode
- Thu Feb 28, 2019 8:06 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 14.9 ch 14
- Replies: 3
- Views: 420
Re: 14.9 ch 14
The Question is: A student was given a standard Cu(s)| Cu^2+ (aq) half-cell and another half-cell containing an unknown metal M immersed in 1.00 M M(NO3)2 (aq). When the copper was connected as the anode at 25C, the cell potential was found to be -0.689 V. What is the reduction potential for the unk...
- Mon Feb 18, 2019 6:56 pm
- Forum: Van't Hoff Equation
- Topic: vant hoff
- Replies: 2
- Views: 461
Re: vant hoff
Gibbs free energy changes with the temperature and pressure of the thermodynamic system. So the point of the van 't Hoff equation is that it relates the change in Keq to the change in temperature, T, when you are given delta H at a constant temperature.
- Sun Feb 10, 2019 10:16 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat as path function
- Replies: 3
- Views: 444
Re: Heat as path function
q is not a state function because the energy transferred depends on the path chosen
- Sun Feb 10, 2019 10:12 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isothermal meaning
- Replies: 4
- Views: 512
Re: Isothermal meaning
ΔT = 0 so the ΔU = 0 ( for an ideal gas) but Q ≠ 0,
the opposite would be an adiabatic process, ΔT ≠ 0 but Q =0
the opposite would be an adiabatic process, ΔT ≠ 0 but Q =0
- Sun Feb 10, 2019 10:06 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Entropy of the Universe
- Replies: 1
- Views: 223
Re: Entropy of the Universe
The second law of thermodynamics states that the total entropy of the universe always increases for a spontaneous process.
- Sun Feb 03, 2019 11:00 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Internal Energy of Ideal Gas
- Replies: 1
- Views: 318
Internal Energy of Ideal Gas
I know the equation is U=3/2nRT but in one of the homework problems another equation with U=5/2nRT is mentioned. Does anyone know what the purpose of this second equation is for?
- Sun Feb 03, 2019 10:49 pm
- Forum: Calculating Work of Expansion
- Topic: Different types of pressure
- Replies: 1
- Views: 235
Re: Different types of pressure
They are given on the constants and formulas sheet so no, just need to know how to correctly apply them.
- Sun Feb 03, 2019 10:42 pm
- Forum: Calculating Work of Expansion
- Topic: L*atm
- Replies: 2
- Views: 297
Re: L*atm
It is on the constants and formulas sheet from our last quiz so it would be given to us.
- Sun Jan 27, 2019 10:50 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE Box Ratios
- Replies: 8
- Views: 969
Re: ICE Box Ratios
basically think of it as x is negative for the reactants because these are being used up to form the positive products
- Sun Jan 27, 2019 10:48 pm
- Forum: Phase Changes & Related Calculations
- Topic: Delta Hº versus delta H
- Replies: 7
- Views: 7562
Re: Delta Hº versus delta H
I believe they are the same.
- Sun Jan 27, 2019 10:45 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: When to use Quadratic equation
- Replies: 10
- Views: 6631
Re: When to use Quadratic equation
You use the quadratic equation when u have an x^2 when you set up the equilibrium constant equation. Sometimes you have just an x so you wouldn’t need to do a quadratic you could just solve.
- Sun Jan 27, 2019 10:44 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: How Le Chat's Principle is Applied
- Replies: 2
- Views: 303
Re: How Le Chat's Principle is Applied
Basically this principle says that if a gas is added or other constraint than the equilibrium shifts to counterbalance the effect applied
- Sun Jan 20, 2019 11:00 pm
- Forum: Ideal Gases
- Topic: OH and H3O
- Replies: 10
- Views: 1381
Re: OH and H3O
When looking at a recation, if the number of hydrogens has decreased when going from reactants to products then the substance is an acid (donates hydrogen ions). If the number of hydrogens increases from reactants to products then that substance is the base (accepts hydrogen ions).
- Sun Jan 20, 2019 10:50 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q VS. K
- Replies: 13
- Views: 1657
Re: Q VS. K
Q changes as the reaction of the system approaches equilibrium versus K that is the numerical value of Q at the "end" of the reaction, when equilibrium is reached. They are the same calculation but different significances.
- Sun Jan 20, 2019 10:39 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: 5%
- Replies: 5
- Views: 530
Re: 5%
You compare the disassociation of the conjugate acid to the conjugate base or vice verse by putting the concentration of the product for example conjugate acid over the concentration of its reactant concentration base times 100%. The picture shows how it is applied for the problem I did at the bottom.
- Mon Jan 14, 2019 12:02 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: K and Q [ENDORSED]
- Replies: 7
- Views: 703
Re: K and Q [ENDORSED]
K is the equilibrium constant and Q is the reaction quotient. K is used when the system is equilibrium and Q is used when the system is not in equilibrium. You can compare K and Q to find out which direction the reaction will proceed.
- Sun Jan 13, 2019 11:58 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Change in ICE tables
- Replies: 1
- Views: 208
Change in ICE tables
Will the reactants always have a negative when doing the c for your ice tables?
- Sun Jan 13, 2019 11:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Question 11.7 [ENDORSED]
- Replies: 3
- Views: 353
Question 11.7 [ENDORSED]
For part a how can you tell which flask is at equilibrium? I know the answer is flask 3 but I just don’t know how to reach this conclusion.
- Sun Jun 10, 2018 11:59 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Homework Question 4.73
- Replies: 1
- Views: 436
Homework Question 4.73
For Question 4.73, how do lone pairs affect bond angles? Specifically when comparing CH2^2- and CH3^- since they are both less than 109.5 degrees but CH3^- is slightly bigger.
- Sun Jun 10, 2018 11:54 pm
- Forum: Dipole Moments
- Topic: Homework Question 4.25
- Replies: 2
- Views: 501
Homework Question 4.25
I’m still struggling with distinguishing if the atom is polar or nonpolar. Judging off of the answers to Question 4.25 is the best way to distinguish if it is polar or nonpolar to see if the Lewis structure looks symmetrical and if so it’s nonpolar and if the Lewis structure isn’t then it polar or i...
- Sun Jun 10, 2018 12:22 pm
- Forum: Hybridization
- Topic: Hibridization
- Replies: 3
- Views: 631
Re: Hibridization
To find hybridization you must determine the number of regions of electron density present. A region of electron density is either a pair of lone pair electrons or a bond (every single, double and triple bonds just counts as one region). The number of regions correspond to a hybrid orbital (s, sp, s...
- Sun Jun 10, 2018 12:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sunday Step-Up Session
- Replies: 2
- Views: 520
Sunday Step-Up Session
Will there still be the Step-Up Session from 5-7 tonight in Hedrick Hall?
- Wed Jun 06, 2018 2:24 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pH calculations on Final
- Replies: 2
- Views: 545
pH calculations on Final
Will we have to do pH calculations on the final using the -log equation based on a concentration we are given? I know there are homework questions concerning calculations but we some UA’s have said there will be calculations on the final while others have said not to worry about it.
- Wed Jun 06, 2018 2:18 pm
- Forum: Hybridization
- Topic: Pi bonds in triple bond
- Replies: 17
- Views: 1899
Re: Pi bonds in triple bond
one sigma and two pi bonds
- Sun Jun 03, 2018 11:10 pm
- Forum: Hybridization
- Topic: Hybrid orbitals
- Replies: 6
- Views: 785
Re: Hybrid orbitals
A region of electron density is either a pair of lone pair electrons or a bond (every single, double and triple bonds just counts as one region). The number of regions correspond to a hybrid orbital (s, sp, sp2 etc.) 1 region - s 2 regions- sp 3 regions- sp2 4 regions- sp3 5 regions- sp3d 6 regions-...
- Sun Jun 03, 2018 10:59 pm
- Forum: Hybridization
- Topic: Sigma Bonds
- Replies: 5
- Views: 704
Re: Sigma Bonds
Every bond has a sigma bond. A single bond has one sigma bond. A double bond has one sigma and one pi bond. A triple bond has one sigma and two pi bonds. They are the strongest type of covalent bond. Basically, it is a more specific way to classify bonds and occurs from the overlapping of orbitals.
- Sun Jun 03, 2018 10:54 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand terms
- Replies: 2
- Views: 399
Re: Ligand terms
It’s a way to further classify ligands by identifying how many sites the central atom binds to.
- Sun Jun 03, 2018 10:50 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma and Pi bonds
- Replies: 3
- Views: 571
Re: Sigma and Pi bonds
I’m guessing that there would be an arrow pointing to a bond and you would have to identify the type or it would ask how many total pi and sigma bonds there are in a Lewis structure that we would be given a picture of.
- Sun May 20, 2018 6:59 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Which charge is more favorable?
- Replies: 2
- Views: 519
Which charge is more favorable?
Between these two drawings of Lewis Structures, would it be more favorable to draw the structure so that there is a -1 charge on 2 of the O's and a 0 formal charge on the central atom, S or would it be better for all the O's to have a FC of 0 and then S to have a charge of -2? I’m not sure if there ...
- Sun May 20, 2018 6:31 pm
- Forum: Octet Exceptions
- Topic: 3.59
- Replies: 1
- Views: 272
Re: 3.59
I’m guessing you are referring to part (a) of 3.59 ? because that is the only one without a full octet but this is because it's not possible to have a full octet on one of the elements since ClO is radical since there is an odd number of total valence electrons for ClO since Cl has 7 valence electro...
- Mon May 14, 2018 12:12 am
- Forum: Lewis Structures
- Topic: Formal Energies [ENDORSED]
- Replies: 2
- Views: 450
Re: Formal Energies [ENDORSED]
Formal energy aka formal charge is the difference between the number of valence electrons on the free atom minus number of valence electrons assigned to the atom in the molecule. It tells you how reactive the atom is and also it helps you see if you drew your Lewis structure correct because you can ...
- Mon May 14, 2018 12:00 am
- Forum: Lewis Structures
- Topic: Octet Rule [ENDORSED]
- Replies: 3
- Views: 638
Re: Octet Rule [ENDORSED]
I do not know all the exceptions but elements containing d-orbitals can hold more electrons than the octet rule.
P can hold up to 10 electrons.
S can hold up to 12 electrons.
B, Al- 6 electrons.
P can hold up to 10 electrons.
S can hold up to 12 electrons.
B, Al- 6 electrons.
- Sun May 13, 2018 11:22 pm
- Forum: Ionic & Covalent Bonds
- Topic: octet explanation [ENDORSED]
- Replies: 3
- Views: 435
Re: octet explanation [ENDORSED]
This just means that they fill the octet for however many valence electrons they require without going over so if an element only has four valence electrons than this is "as far" as it can go towards completing the octet.
- Sun May 13, 2018 10:12 pm
- Forum: Ionic & Covalent Bonds
- Topic: VALENCE ELECTRONS [ENDORSED]
- Replies: 16
- Views: 2151
Re: VALENCE ELECTRONS [ENDORSED]
You just look at the periodic table and count what position the element is in in the row (excluding d block). For example: Oxygen has 6 valence electrons and Flourine has 7 and Carbon has 4 valence electrons.
- Mon May 07, 2018 1:27 am
- Forum: Trends in The Periodic Table
- Topic: Across vs Down Trend
- Replies: 2
- Views: 381
Re: Across vs Down Trend
As you move across the period the atomic radius gets smaller and as you move down the column the radius gets bigger. So silver has a larger atomic radius than zinc. This is because when you add a proton, then the nucleus pulls the electrons in stronger, pulling the atoms cell close to the nucleus. S...
- Sun May 06, 2018 11:51 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Minimum indeterminacy
- Replies: 1
- Views: 230
Re: Minimum indeterminacy
In the Heisenberg equation you are solving for the uncertainty (indeterminacy) in position, mass, or volume based on the information the question gives you and you solve to find the amount for the variable that is equal to or just above the amount h/4(pi) so it doesn't make sense to solve for the ma...
- Sun May 06, 2018 10:54 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Special Cases [ENDORSED]
- Replies: 3
- Views: 501
Re: Special Cases [ENDORSED]
There is no way to tell from just looking at the periodic table because they have been found to be exceptions through experimentation. The only ones I believe that we need to know for the test are Cu and Cr like Dr. Lavelle said, it is also easy to remember that Gold and Silver are too.
- Sun May 06, 2018 10:42 pm
- Forum: SI Units, Unit Conversions
- Topic: #9 on Midterm Practice Review (unicorn)
- Replies: 4
- Views: 631
Re: #9 on Midterm Practice Review (unicorn)
It is usually always best to automatically convert to L in most problems when you see mL since this is the unit the answer needs to be in for most problems. This question does not specify the units the answer has to be in so since the question gives the volume in mL it is just easier to find the ans...
- Sun Apr 29, 2018 11:06 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Radius
- Replies: 3
- Views: 390
Re: Radius
The size of an atom changes depending on the size of the nucleus and how much energy each electron has. An element’s location on the periodic table affects the size, thus the radius changes so if you were to calculate the energy of the electrons you would know that the radius has changed.
- Sun Apr 29, 2018 10:59 pm
- Forum: *Shrodinger Equation
- Topic: Schrodinger equation definition?
- Replies: 3
- Views: 517
Re: Schrodinger equation definition?
The Schrondinger equation basically helps us find the equation's wave function. Once we know this then we can find the quantum numbers and shapes of the orbitals that characterize electrons.
- Sun Apr 29, 2018 10:46 pm
- Forum: Trends in The Periodic Table
- Topic: s, p, d, f
- Replies: 16
- Views: 4349
Re: s, p, d, f
Each orbital in a su shell has a different shape characterized by a different letter (s, p, d,f). They have electrons with different angular momentums so this sets them apart from each other.
- Sun Apr 22, 2018 12:23 pm
- Forum: Photoelectric Effect
- Topic: Energy spectrum
- Replies: 4
- Views: 415
Re: Energy spectrum
This is because the Bohr model only works with hydrogen. It does not correspond to other energy levels, so these other energy have different properties than the first. Since hydrogen atoms have only one electron, they contains a large number of shells, thus when one electron jumps from one shell to ...
- Sun Apr 22, 2018 10:47 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Calculating energy [ENDORSED]
- Replies: 3
- Views: 342
Re: Calculating energy [ENDORSED]
Since you are given the wavelength you can solve for the frequency since the c in this equation is a constant c=(wavelength)(frequency). Then the Energy equation is E=h*(frequency). Since you just found frequency and h is a constant then you can solve for the energy. Or you can simply just use the e...
- Sun Apr 22, 2018 2:54 am
- Forum: DeBroglie Equation
- Topic: Wavelike Properties [ENDORSED]
- Replies: 2
- Views: 328
Re: Wavelike Properties [ENDORSED]
If you were to look for the de Brogolie wavelength of a macroscopic object it would be tiny since in this equation h, Planck's constant is already very small and then then macroscopic object's mass which would be m is way bigger than the mass of particles that de Brogolie's equation usually deals wi...
- Sun Apr 15, 2018 11:39 pm
- Forum: Empirical & Molecular Formulas
- Topic: Name of a Compound
- Replies: 2
- Views: 841
Re: Name of a Compound
I’m sure on tests he will give us the names to complex compounds but I think this really just comes with practice and the more you become familiar with different compounds. If you have some knowledge of the compound you could know that sodium Na bicarbonate is CO3 and there is also an H so it’s NaHC...
- Sun Apr 15, 2018 11:27 pm
- Forum: Properties of Light
- Topic: Speed of light constant
- Replies: 5
- Views: 488
Re: Speed of light constant
this is the speed of light in a vacuum so this constant is wavelength x frequency
- Sun Apr 15, 2018 11:23 pm
- Forum: SI Units, Unit Conversions
- Topic: Avogadro #
- Replies: 9
- Views: 1205
Re: Avogadro #
Avogadro‘s # is the number of particles, atoms or molecules that are in one mole. It can be applied when you have an amount given for moles and the question asks for it in atoms so you use dimensional analysis to convert values.
- Sun Apr 15, 2018 11:17 pm
- Forum: Photoelectric Effect
- Topic: Quanta vs. Photon [ENDORSED]
- Replies: 3
- Views: 648
Re: Quanta vs. Photon [ENDORSED]
Quanta are discrete bundles in which radiation and other forms of energy occur and light is sent out in the different ‘amounts’ (quanta) that called photons.
- Sun Apr 15, 2018 11:09 pm
- Forum: Photoelectric Effect
- Topic: Intensity
- Replies: 1
- Views: 202
Re: Intensity
I=E/tA
where I is intensity, E is energy, t is time, A is area of the radiation
The reason to find the intensity of radiation is because a surface has different intensities depending on the different direction the surface is hit.
where I is intensity, E is energy, t is time, A is area of the radiation
The reason to find the intensity of radiation is because a surface has different intensities depending on the different direction the surface is hit.
- Sun Apr 15, 2018 10:58 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Isotopes [ENDORSED]
- Replies: 12
- Views: 1520
Re: Isotopes [ENDORSED]
Basically a simple way to think about isotopes are that within the same element there are atoms that have a different number of neutrons but same number of protons. So the atomic mass within different isotopes changes.
(IsoTopes) T for Top meaning the top number (atomic mass changes)
(IsoTopes) T for Top meaning the top number (atomic mass changes)
- Thu Oct 05, 2017 8:18 pm
- Forum: Significant Figures
- Topic: Sig Figs- Addition and Subtraction [ENDORSED]
- Replies: 4
- Views: 985
Sig Figs- Addition and Subtraction [ENDORSED]
In Appendix 1C there is a rule that says to "make sure that the number of decimal places in the result is the same as the smallest number of decimal places in the data." How does this work if one of the numbers you are adding does not have decimal places? For example: 12+ 0.123=
- Thu Oct 05, 2017 8:13 pm
- Forum: Significant Figures
- Topic: Integers and Exact Numbers- Sig Figs [ENDORSED]
- Replies: 4
- Views: 827
Integers and Exact Numbers- Sig Figs [ENDORSED]
Can someone clarify what it means in Appendix 1C when it says "In multiplication and division by an interger or an exact number, the uncertainty of the result is determined by the measured value."?