Search found 94 matches
- Sat Mar 14, 2020 11:20 am
- Forum: Administrative Questions and Class Announcements
- Topic: online
- Replies: 3
- Views: 284
online
Does anyone know what it means for the final to be online? Do we have to print and scan or is it multiple choice or?
- Sat Mar 14, 2020 11:19 am
- Forum: Administrative Questions and Class Announcements
- Topic: "Open Book" Final?
- Replies: 30
- Views: 2159
Re: "Open Book" Final?
open book pretty much allows you any resource you have
- Sat Mar 14, 2020 11:16 am
- Forum: General Rate Laws
- Topic: functional difference
- Replies: 1
- Views: 170
functional difference
What is the functional difference between a differential rate law and an integrated rate law?
- Sat Mar 14, 2020 11:14 am
- Forum: Zero Order Reactions
- Topic: kind of reaction
- Replies: 25
- Views: 1245
kind of reaction
What kind of reaction would be zero order?
- Sat Mar 14, 2020 11:14 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: elementary rate law
- Replies: 4
- Views: 375
elementary rate law
What is the difference between an elementary rate law and an overall rate law?
- Thu Mar 05, 2020 5:15 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: K
- Replies: 5
- Views: 434
K
How do you tell if K >1 given a redox reaction?
- Thu Mar 05, 2020 4:26 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L.7
- Replies: 1
- Views: 198
6L.7
Can someone explain any or all of the parts of this problem to me in regard to finding the half reaction?
AgBr(s) <-> Ag+(aq) + Br-(aq)
H+(aq) + OH-(aq) -> H2O(l)
Cd(s) + 2Ni(OH)3(s) -> Cd(OH)2(s) + 2Ni(OH)2
AgBr(s) <-> Ag+(aq) + Br-(aq)
H+(aq) + OH-(aq) -> H2O(l)
Cd(s) + 2Ni(OH)3(s) -> Cd(OH)2(s) + 2Ni(OH)2
- Wed Mar 04, 2020 5:30 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: acidic solution
- Replies: 5
- Views: 509
acidic solution
How would one write the cell diagram of reaction that is in an acidic solution? Is it any different?
- Wed Mar 04, 2020 5:29 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: half reaction of cell diagram
- Replies: 2
- Views: 222
half reaction of cell diagram
When writing a cell diagram, does it matter which order you put the two components of the half reaction? for example if one of the half reactions is 2I-(aq) -> I2(s), does it matter which is written first?
- Wed Mar 04, 2020 5:26 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: platinum
- Replies: 2
- Views: 245
platinum
In homework question 6L.5 part b, only one of the half reactions doesn't include a solid. However in the back of the book it says that both sides of the cell diagram include platinum and I was wondering why?
- Sun Mar 01, 2020 2:16 pm
- Forum: First Order Reactions
- Topic: first order
- Replies: 4
- Views: 362
first order
What does it mean for a reaction if it is first order versus second order or any other order?
- Sun Mar 01, 2020 2:15 pm
- Forum: General Rate Laws
- Topic: temp
- Replies: 2
- Views: 210
temp
How is temperature incorporated into finding rate? For example in class, one of the example problems said the temp was originally at 25 degrees celsius and then it was quickly heated to 300 degrees. How is this incorporated into the concentration vs time graph?
- Sun Mar 01, 2020 2:13 pm
- Forum: General Rate Laws
- Topic: units
- Replies: 9
- Views: 568
units
What are the units for rate?
- Sun Mar 01, 2020 2:12 pm
- Forum: General Rate Laws
- Topic: rate law
- Replies: 2
- Views: 252
rate law
What's the difference in finding the rate using just reactants versus both reactants and products?
- Sun Mar 01, 2020 2:11 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: how can you tell
- Replies: 11
- Views: 805
how can you tell
How can you tell whether kinetics or thermodynamics controls a reaction?
- Sun Feb 23, 2020 3:56 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: electrode
- Replies: 4
- Views: 429
electrode
What exactly is an electrode?
- Sun Feb 23, 2020 3:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: salt bridge
- Replies: 10
- Views: 711
salt bridge
What exactly is a salt bridge?
- Sun Feb 23, 2020 3:54 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: movement e
- Replies: 3
- Views: 236
movement e
What exactly causes the e to move? And on that how exactly are they moving?
- Sun Feb 23, 2020 3:53 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: neg vs pos
- Replies: 9
- Views: 760
neg vs pos
What does it mean for voltage to be negative verses positive?
- Sun Feb 23, 2020 3:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: voltage
- Replies: 8
- Views: 430
voltage
What exactly is voltage?
- Wed Feb 12, 2020 3:08 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: constant pressure and volume
- Replies: 3
- Views: 360
constant pressure and volume
How do constant pressures and volumes affect the calculations for entropy, enthalpy, and Gibbs free energy?
- Wed Feb 12, 2020 3:07 pm
- Forum: Phase Changes & Related Calculations
- Topic: internal energy
- Replies: 2
- Views: 292
internal energy
How do constant pressure and temperature affect calculations for internal energy?
- Wed Feb 12, 2020 3:06 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: spontaneity
- Replies: 39
- Views: 1989
spontaneity
What is most important in deciding if a reaction is spontaneous (ex enthalpy, entropy, Gibbs free energy)?
- Wed Feb 12, 2020 3:04 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: enthalpy constant pressure
- Replies: 1
- Views: 111
enthalpy constant pressure
why does delta H = q at constant pressure?
- Wed Feb 12, 2020 3:04 pm
- Forum: Phase Changes & Related Calculations
- Topic: rate of reactions
- Replies: 3
- Views: 344
rate of reactions
Do we need to know about the rate of reactions for the midterm?
- Sun Feb 09, 2020 8:40 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: including phase changes
- Replies: 2
- Views: 250
including phase changes
How can you tell when you have to include the energy required for a phase change in a reaction?
- Sun Feb 09, 2020 8:39 pm
- Forum: Phase Changes & Related Calculations
- Topic: irreversible equations
- Replies: 2
- Views: 258
irreversible equations
Is there a difference in equation used for when something is irreversible vs reversible besides the ones for calculating work?
- Sun Feb 09, 2020 8:38 pm
- Forum: Phase Changes & Related Calculations
- Topic: reversible
- Replies: 4
- Views: 223
reversible
What exactly does it mean for a reaction to be irreversible? I know the definition with the infinitely small changes but that doesn't quite make sense to me on a conceptual basis.
- Sun Feb 09, 2020 8:37 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: enthalpy
- Replies: 3
- Views: 256
enthalpy
What is the relationship between work and heat when calculating enthalpy? Not just a formula but conceptually what it means.
- Sun Feb 09, 2020 8:36 pm
- Forum: Phase Changes & Related Calculations
- Topic: equipartition theorem
- Replies: 1
- Views: 120
equipartition theorem
What exactly is the equipartition theorem and will we need to know it for the midterm?
- Thu Jan 30, 2020 5:02 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Celcius and Kelvin
- Replies: 11
- Views: 471
Re: Celcius and Kelvin
The conversion should be on the equation sheet.
- Thu Jan 30, 2020 5:00 pm
- Forum: Phase Changes & Related Calculations
- Topic: State Functions
- Replies: 9
- Views: 496
Re: State Functions
A state function is something that is not dependent on how you get to the end result. For enthalpy, it doesn't matter how you get to the value therefore it is a state function. This also implies that state functions are additive.
- Thu Jan 30, 2020 4:57 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: System vs Surroundings
- Replies: 14
- Views: 2145
Re: System vs Surroundings
The system is the actual reaction and the surrounding is everything else.
- Thu Jan 30, 2020 4:55 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Types of Systems
- Replies: 4
- Views: 302
Types of Systems
What are some types of closed systems we might see that don't include a piston?
- Thu Jan 30, 2020 4:54 pm
- Forum: Calculating Work of Expansion
- Topic: Application
- Replies: 1
- Views: 121
Application
How necessary is it to truly understand the calculus behind the work of expansion? Will there be questions on the midterm that specifcally ask to solve for this?
- Fri Jan 24, 2020 12:04 pm
- Forum: Ideal Gases
- Topic: Kc vs Kp
- Replies: 109
- Views: 5421
Re: Kc vs Kp
kp is used when dealing with gases and is usually given with units like atm or bar. kc is for molar concentrations and will be given as aqueous solutions.
- Fri Jan 24, 2020 12:02 pm
- Forum: Ideal Gases
- Topic: test 1
- Replies: 9
- Views: 438
Re: test 1
No, test 1 only covers to last Friday's lecture which is outlines 1 and 2
- Fri Jan 24, 2020 12:01 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: equilibrium
- Replies: 3
- Views: 179
equilibrium
Do all reactions technically establish an equilibrium?
- Fri Jan 24, 2020 11:59 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: solvent
- Replies: 10
- Views: 422
solvent
How can you tell when a solvent is part of the reaction? For example self test 5G.3A on page 401 how was it decided which molecules are involved in the equilibrium constant?
- Fri Jan 24, 2020 11:56 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: salt solutions
- Replies: 4
- Views: 229
salt solutions
Are salt solutions and buffers the same thing? If not what's the difference?
- Thu Jan 16, 2020 5:45 pm
- Forum: Ideal Gases
- Topic: ph
- Replies: 10
- Views: 519
ph
Can ph be above 14 or below 0? Or is there a specific cap at those values?
- Thu Jan 16, 2020 5:43 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: change in temp
- Replies: 4
- Views: 125
change in temp
Why does a reaction favor products when heated if is endothermic?
- Thu Jan 16, 2020 5:39 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: weak acids and weak bases
- Replies: 3
- Views: 167
weak acids and weak bases
How do you perform calculations with weak acids and weak bases?
- Thu Jan 16, 2020 5:37 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Protonation & Deprotonation
- Replies: 9
- Views: 382
Re: Protonation & Deprotonation
protonation is the addition of a proton and deprotonation is the removal of a proton. Protonation refers to bases usually and deprotonation to acids.
- Thu Jan 16, 2020 5:29 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: weak acid and strong base
- Replies: 2
- Views: 183
weak acid and strong base
I understand how to calculate concentrations when mixing a weak acid or base with water, but what happens when mixing a weak acid and a strong base or vice versa?
- Thu Jan 09, 2020 4:53 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: kc and kp
- Replies: 3
- Views: 202
kc and kp
What exactly is the relationship between kc and kp? Wouldn't a reaction with all its components being aqueous have a significantly lower kp than that of a reaction in the gaseous state? I guess I'm asking what is the point of calculating both?
- Thu Jan 09, 2020 4:51 pm
- Forum: Ideal Gases
- Topic: kc to kp
- Replies: 2
- Views: 163
kc to kp
does pv=nrt only work for the individual components of K? For example if I wanted to convert kc to kp would I have to put all of the separate components into pv=nrt?
- Thu Jan 09, 2020 4:48 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Why is K unitless?
- Replies: 10
- Views: 667
Re: Why is K unitless?
K is a ratio and therefore is moreso a comparison than a value. You can also think of the units as canceling as the units on top equal that of the bottom.
- Thu Jan 09, 2020 4:47 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K
- Replies: 3
- Views: 118
K
If you have a chemical equation in which one molecule is aqueous and another in the gaseous state, when writing K would you mix using concentration and partial pressure? Or would this not happen.
- Fri Dec 06, 2019 10:34 am
- Forum: Resonance Structures
- Topic: midterm #7a [ENDORSED]
- Replies: 1
- Views: 309
midterm #7a [ENDORSED]
Why were all of the phosphorus-oxygen bond lengths the same?
- Fri Dec 06, 2019 10:33 am
- Forum: Quantum Numbers and The H-Atom
- Topic: midterm #6A
- Replies: 1
- Views: 181
midterm #6A
What are the possible angular momentum quantum numbers of the highest energy electrons in magnesium ions? How did you go about figuring this out?
- Fri Dec 06, 2019 10:29 am
- Forum: Sigma & Pi Bonds
- Topic: test 2 #7a
- Replies: 4
- Views: 268
test 2 #7a
On test two for number 7a why was the answer 14 hydrogen bonding sites?
- Fri Dec 06, 2019 10:27 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: bond strength
- Replies: 2
- Views: 303
bond strength
What factors affect the bond strength of an acid when going down a group?
- Fri Dec 06, 2019 10:24 am
- Forum: Hybridization
- Topic: pi bonds
- Replies: 1
- Views: 97
pi bonds
How are pi bonds incorporated into hybridization?
- Tue Nov 26, 2019 5:58 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing This Equation
- Replies: 11
- Views: 1186
Re: Balancing This Equation
Combustion implies that the reactant given is reacting with O2.
- Tue Nov 26, 2019 5:56 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length
- Replies: 22
- Views: 1314
Re: Bond Length
You have to be given the actual bond length from previous experiments but there are general guidelines such as double bonds being shorter than single bonds.
- Tue Nov 26, 2019 5:54 pm
- Forum: Lewis Acids & Bases
- Topic: oxides
- Replies: 3
- Views: 243
oxides
During lecture a lot of emphasize was placed on oxides and I was wondering what specifically oxides have to do with acids and bases?
- Tue Nov 26, 2019 5:51 pm
- Forum: Bronsted Acids & Bases
- Topic: Difference
- Replies: 3
- Views: 221
Difference
What exactly is the difference between Lewis acids and bases and Bronsted acids and bases?
- Tue Nov 26, 2019 5:50 pm
- Forum: Hybridization
- Topic: double bonds
- Replies: 7
- Views: 473
double bonds
How do double bonds affect hybridization?
- Thu Nov 21, 2019 10:35 am
- Forum: Dipole Moments
- Topic: Melting points
- Replies: 15
- Views: 1361
Re: Melting points
Intermolecular forces are the only thing that determine melting and boiling points. Therefore having a double bond doesn't affect the melting point.
- Thu Nov 21, 2019 10:30 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Which shape
- Replies: 6
- Views: 458
Which shape
How do you determine if the shape formed will be polar or non polar? For example if a molecule can be either cis or trans(CCl2H2) how do you tell if you are asked to determine if the molecule is polar or non polar?
- Thu Nov 21, 2019 10:28 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: Strongest force
- Replies: 6
- Views: 334
Strongest force
Which intermolecular force is strongest? I though it was hydrogen bonding, but now I'm wondering if intermolecular forces involving ions are stronger.
- Thu Nov 21, 2019 10:27 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: Forces
- Replies: 3
- Views: 264
Forces
Are induced dipole forces the same as London dispersion forces? Also does induced dipole only occur between a polar and non polar molecule?
- Wed Nov 13, 2019 5:17 pm
- Forum: Bond Lengths & Energies
- Topic: Bond lengths in molecules
- Replies: 7
- Views: 527
Re: Bond lengths in molecules
The more bonds there are (triple versus single) the shorter the bond is. This is because there are more e being shared and thus both atoms are pulled in closer together.
- Wed Nov 13, 2019 5:14 pm
- Forum: Balancing Chemical Reactions
- Topic: Fractions
- Replies: 34
- Views: 1489
Re: Fractions
I would convert it to an integer as the TAs always change it and they are the ones that grade the tests and homework.
- Wed Nov 13, 2019 5:12 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 7
- Views: 491
Re: Formal Charge
formal charge = V - (L + B/2)
V - valence e
L - e in lone pairs
B - e in bonded pairs
This will give you the formal charge of one atom in a molecule. To find the formal charge add of the formal charges of all the individual atoms.
V - valence e
L - e in lone pairs
B - e in bonded pairs
This will give you the formal charge of one atom in a molecule. To find the formal charge add of the formal charges of all the individual atoms.
- Wed Nov 13, 2019 5:09 pm
- Forum: Empirical & Molecular Formulas
- Topic: empirical = molecular?
- Replies: 15
- Views: 982
Re: empirical = molecular?
If the molar mass given is equal to that of the empirical formula then the chemical formula found is both the empirical and molecular formula.
- Wed Nov 13, 2019 5:08 pm
- Forum: SI Units, Unit Conversions
- Topic: Memorizing Conversions
- Replies: 25
- Views: 1392
Re: Memorizing Conversions
Everything that is needed should be provided. However, knowing the conversions definitely helps with exams.
- Wed Nov 13, 2019 5:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VESPR Model of H2O
- Replies: 12
- Views: 888
Re: VESPR Model of H2O
H2O is bent. I'm assuming we will cover molecular shapes with lone pairs sometime in the next week.
- Sun Nov 03, 2019 9:17 am
- Forum: Resonance Structures
- Topic: "Equivalent" resonance structures
- Replies: 2
- Views: 157
Re: "Equivalent" resonance structures
A resonance structure only has a difference in the placement of double and triple bonds. I think formal charges would determine which of the resonance structures is most likely, but you only need to look at bonds to see if there is resonance.
- Sun Nov 03, 2019 9:14 am
- Forum: SI Units, Unit Conversions
- Topic: midterm 1
- Replies: 5
- Views: 438
midterm 1
Does anyone know if Lewis acids and bases will be on the first midterm? And which topics are going to be covered?
- Sun Nov 03, 2019 9:12 am
- Forum: Lewis Structures
- Topic: Exceptions to octet rule
- Replies: 4
- Views: 221
Exceptions to octet rule
Which elements can break the octet rule when forming lewis dot structures and is it likely or just when necessary?
- Sun Nov 03, 2019 9:11 am
- Forum: Lewis Structures
- Topic: Lowest Energy
- Replies: 2
- Views: 189
Lowest Energy
How do you determine the lowest energy lewis structure? For example some structures break the octet rule to get the lowest energy structure. Does that mean formal charges are more important than the octet rule in determining the lowest energy?
- Sun Nov 03, 2019 9:08 am
- Forum: Trends in The Periodic Table
- Topic: Exceptions
- Replies: 4
- Views: 139
Exceptions
What are some of the exceptions to periodic trends? For example O has a lower ionization energy than N.
- Wed Oct 23, 2019 4:20 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs covalent
- Replies: 8
- Views: 890
Re: Ionic vs covalent
You can look at the electronegativity difference to determine if the bond is ionic or covalent but typically you can just go off of whether or not the two atoms are both nonmetal (which gives a covalent bond) or if they are a nonmetal with a metal (which gives an ionic bond).
- Wed Oct 23, 2019 4:17 pm
- Forum: Octet Exceptions
- Topic: Max number of valence e
- Replies: 6
- Views: 669
Max number of valence e
What is the max number of valence e an atom can have? I know there is the octet rule but is that just where the atom is most stable?
- Wed Oct 23, 2019 4:15 pm
- Forum: Lewis Structures
- Topic: Ion lewis structure
- Replies: 9
- Views: 404
Ion lewis structure
When drawing a lewis dot structure does it matter where in the molecule you put the added e ? For example when you have BrO- does it matter where that extra electron is added into the structure?
- Wed Oct 23, 2019 4:13 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Compounds
- Replies: 6
- Views: 258
Ionic Compounds
Are ionic compounds actually bonded and if so how? I understand e are being transferred but how does this transfer differ from a covalent bond in which they are shared?
- Wed Oct 23, 2019 4:11 pm
- Forum: Lewis Structures
- Topic: Valence e in d block
- Replies: 5
- Views: 356
Valence e in d block
How do you count the valence e in the d block? For example how many valence e does Zn have and why?
- Sat Oct 19, 2019 3:53 pm
- Forum: Limiting Reactant Calculations
- Topic: Test 1 Calculator
- Replies: 6
- Views: 417
Re: Test 1 Calculator
You can cheat if you have a graphing calculator as you can store equations and notes in it.
- Sat Oct 19, 2019 3:52 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: What is Molarity?
- Replies: 11
- Views: 1063
Re: What is Molarity?
Molarity is the ratio of the moles of a solute to the liters of the entire solution. This is used to measure the concentration of a specific amount of a substance to the entire solution.
- Sat Oct 19, 2019 3:49 pm
- Forum: SI Units, Unit Conversions
- Topic: midterm/final
- Replies: 18
- Views: 1535
midterm/final
Does anyone know if the midterm/final is going to be more about concepts or calculations? For example which is more likely an essay question or a calculation?
- Sat Oct 19, 2019 3:47 pm
- Forum: Properties of Electrons
- Topic: Angstrom Conversion
- Replies: 12
- Views: 486
Re: Angstrom Conversion
An angstrom is equivalent to 1 x 10^-10 m. I personally compare the values of 10^x to see which way the decimal point needs to move to be in angstroms.
- Sat Oct 19, 2019 3:43 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Memorizing electron configuration
- Replies: 3
- Views: 235
Memorizing electron configuration
Are there any tricks to memorizing which orbital electrons fill up first?
- Wed Oct 09, 2019 3:36 pm
- Forum: Photoelectric Effect
- Topic: Threshold energy
- Replies: 6
- Views: 165
Re: Threshold energy
The threshold energy depends on the type of element as different elements have different properties.
- Wed Oct 09, 2019 3:33 pm
- Forum: Properties of Electrons
- Topic: Polar vs Non polar
- Replies: 15
- Views: 4822
Re: Polar vs Non polar
Polar molecules have an uneven hold on the electrons whereas in non polar molecules the electrons are shared equally or mostly equally. You can tell just by looking at the electronegativity differences of the certain elements.
- Wed Oct 09, 2019 3:30 pm
- Forum: Photoelectric Effect
- Topic: Atomic Spectra [ENDORSED]
- Replies: 3
- Views: 130
Atomic Spectra [ENDORSED]
Why is the line spectrum grouped in specific parts? I know it has to do with the specific releases of energy but how exactly to the two correlate?
- Wed Oct 09, 2019 3:29 pm
- Forum: Properties of Electrons
- Topic: Energy
- Replies: 6
- Views: 347
Energy
Can an atom only take in energy in quanta amounts? I know it is released as such but if struck with light will it only move up an energy level if that specific energy requirement is met? And if so does that mean it would need a second energy requirement to move up another level?
- Wed Oct 09, 2019 3:26 pm
- Forum: Properties of Electrons
- Topic: Energy Levels
- Replies: 8
- Views: 240
Energy Levels
I was wondering if when an electron drops two energy levels does that mean that two photons are released or is it just a photon with more energy?
- Thu Oct 03, 2019 12:42 pm
- Forum: Balancing Chemical Reactions
- Topic: Products of combustion reactions
- Replies: 7
- Views: 308
Re: Products of combustion reactions
The products always include CO2 and H2O but there can also be additional products depending on what is being combusted. For example the combustion of caffeine (C8H10N4O2) also produces the product NO2 alongside CO2 and H2O.
- Thu Oct 03, 2019 12:38 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Empirical and Molecular Formulas
- Replies: 13
- Views: 657
Re: Empirical and Molecular Formulas
If you are given a formula and a given mass you can calculate the molar mass of the compound and see if the two masses are equal. If they are equal then the given formula is empirical. If not, then it is a molecular formula. You also may be able to tell by checking if the ratios are all in their sma...
- Thu Oct 03, 2019 12:34 pm
- Forum: Empirical & Molecular Formulas
- Topic: Finding a reactant from given products
- Replies: 2
- Views: 276
Finding a reactant from given products
I know in some of the hw problems there are examples in which the masses of the products are given and from there you have to find out the empirical and molecular formulas of the reactant. To solve this you eventually have to take a ratio from the atoms in the product to the reactant (ex. 1 mol H/2 ...
- Thu Oct 03, 2019 12:28 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 418154
Re: Final Jitters
Doing practice problems usually helps me for tests. I will also say that jitters before the first test are definitely worse than following tests as you have less of an idea of what to expect. I would just prepare as best as you can and use your experience with the first test to help you study for fo...
- Tue Oct 01, 2019 12:17 pm
- Forum: Empirical & Molecular Formulas
- Topic: Mass Percent Composition
- Replies: 5
- Views: 356
Mass Percent Composition
Is it necessary to imagine that you have 100g of a molecule when trying to figure out the empirical and molecular formulas? You are trying to convert everything to moles, so if you are originally given grams of the different chemicals in the molecule, could you not skip the conversion to mass percen...