Search found 92 matches

by pmokh14B
Mon Feb 17, 2020 4:42 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cv vs Cp
Replies: 16
Views: 37

Re: Cv vs Cp

we use Cv when the volume is constant(isochoric) and Cp when pressure is constant (isobaric)
by pmokh14B
Mon Feb 17, 2020 4:41 pm
Forum: Ideal Gases
Topic: pv=nrt
Replies: 19
Views: 54

Re: pv=nrt

Yes, you can use this for any ideal gas.
by pmokh14B
Mon Feb 17, 2020 4:40 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Open Systems
Replies: 6
Views: 18

Re: Open Systems

Any equations, depending on whether or not the work/effect on the system is adiabetic/isothermal/isochoric, etc...
by pmokh14B
Mon Feb 17, 2020 4:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Recommended Pathway for Chem Series
Replies: 7
Views: 45

Re: Recommended Pathway for Chem Series

I think most people take C and BL together and I've heard a lot of people just hold off on CL until C-sesh or senior year.
by pmokh14B
Mon Feb 17, 2020 4:38 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Constant R
Replies: 15
Views: 35

Re: Constant R

The units for each are on the equation sheet. Depending on that you decide which to use.
by pmokh14B
Mon Feb 17, 2020 4:37 pm
Forum: Administrative Questions and Class Announcements
Topic: 14BL and 14C
Replies: 7
Views: 34

Re: 14BL and 14C

I think thats what most people do.
by pmokh14B
Sun Feb 16, 2020 1:11 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Joules or KJ?
Replies: 14
Views: 39

Re: Joules or KJ?

Either works, unless it's specified in the problem.
by pmokh14B
Sun Feb 16, 2020 1:11 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: R constants
Replies: 21
Views: 326

Re: R constants

it depends on the units of the other variables in the equation/calculation you are doing.
by pmokh14B
Sun Feb 16, 2020 1:09 pm
Forum: Ideal Gases
Topic: pv=nrt
Replies: 19
Views: 54

Re: pv=nrt

Yes, this can be used for an ideal gas.
by pmokh14B
Sun Feb 16, 2020 1:08 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: spontaneity
Replies: 23
Views: 59

Re: spontaneity

Gibbs free energy, which is determined by enthalpy and entropy.
by pmokh14B
Mon Feb 10, 2020 9:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Multistep reactions
Replies: 6
Views: 52

Multistep reactions

Do we need to know how to find final equilibrium concentrations for multistep reactions? If so, where can I find examples and solutions?
by pmokh14B
Sat Feb 08, 2020 9:53 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Biological Examples
Replies: 1
Views: 13

Biological Examples

What Biological examples are important to know for the midterm?
by pmokh14B
Sat Feb 08, 2020 9:49 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: units
Replies: 3
Views: 14

Re: units

H and G can either be in kJ/mol or J/mol.
U is either kJ or J based on the units for q and w (which need to be the same).
S can be J/K or J/K/mol.
by pmokh14B
Sat Feb 08, 2020 9:45 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reason for decrease in entropy
Replies: 5
Views: 23

Re: Reason for decrease in entropy

a system goes from disordered to less disordered when you decrease the temperature of the system, for example.
by pmokh14B
Sat Feb 08, 2020 9:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Adding Reactions
Replies: 2
Views: 7

Re: Adding Reactions

You raise the constant to the stoichiometric coefficient by which you multiply the reaction.
by pmokh14B
Sat Feb 08, 2020 9:37 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Negative Heat Capacity
Replies: 4
Views: 19

Re: Negative Heat Capacity

I don't think so. You are raising the temperature for heat capacity, which would require a positive input of energy/heat.
by pmokh14B
Wed Jan 29, 2020 5:23 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 4 Homework
Replies: 3
Views: 35

Week 4 Homework

Are we allowed to do problems from the end of Acids and Bases Equilibria for this weeks homework?
by pmokh14B
Mon Jan 27, 2020 12:41 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Signs for enthalpy
Replies: 8
Views: 16

Re: Signs for enthalpy

Enthalpy is positive for endothermic reactions or indicates energy needs to be put in (i.e breaking bonds). negative enthalpy indicates exothermic reactions, or breaking bonds.
by pmokh14B
Mon Jan 27, 2020 12:33 pm
Forum: Phase Changes & Related Calculations
Topic: revere reactions
Replies: 7
Views: 28

Re: revere reactions

Yes, they would just be the opposite sign of the phase changes that require energy (i.e (delta)Hfreezing, is -(delta)H melting)
by pmokh14B
Mon Jan 27, 2020 12:30 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Units for temperature?
Replies: 11
Views: 27

Re: Units for temperature?

I think you use kelvin.
by pmokh14B
Mon Jan 27, 2020 12:29 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: "Breaking bonds is always endothermic"
Replies: 6
Views: 26

Re: "Breaking bonds is always endothermic"

In biology a small amount of energy is needed, but once that phosphate binds to another molecule, enzyme, etc. it releases a lot more energy than what was required to break it.
by pmokh14B
Mon Jan 27, 2020 12:26 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy of Diatomic Gases
Replies: 4
Views: 19

Re: Standard Enthalpy of Diatomic Gases

The diatomic molecules form very naturally and don't require much energy to form from their respective atoms.
by pmokh14B
Tue Jan 21, 2020 12:54 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: units for pressure
Replies: 5
Views: 168

Re: units for pressure

My TA said we'll usually get things in bar.
by pmokh14B
Tue Jan 21, 2020 12:54 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: effects on pH
Replies: 7
Views: 29

Re: effects on pH

Because those conjugates are more stable than their respective acids/bases, so they stay in solution rather than reacting to form hydronium or hydroxide.
by pmokh14B
Tue Jan 21, 2020 12:52 pm
Forum: Ideal Gases
Topic: Topics for Test 1
Replies: 17
Views: 96

Re: Topics for Test 1

I would review my notes and do the homework sections for Equilibrium and acids and bases equilibria.
by pmokh14B
Tue Jan 21, 2020 12:52 pm
Forum: General Science Questions
Topic: test 1
Replies: 8
Views: 47

Re: test 1

Test 1 is during the discussion section of week three.
by pmokh14B
Tue Jan 21, 2020 12:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm and final
Replies: 6
Views: 32

Re: Midterm and final

Yes they are, but I dont think the tests are.
by pmokh14B
Mon Jan 13, 2020 12:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units for K
Replies: 21
Views: 57

Re: Units for K

K does not have units it is a constant.
by pmokh14B
Mon Jan 13, 2020 12:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Hw for next week
Replies: 19
Views: 65

Re: Hw for next week

As long as we cover the information during the week.
by pmokh14B
Mon Jan 13, 2020 12:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc
Replies: 5
Views: 17

Re: Kc

I think you can use aqueous solutions and gasses, but not solids or liquids.
by pmokh14B
Mon Jan 13, 2020 12:27 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q=K
Replies: 14
Views: 38

Re: Q=K

When Q equals K the system is at equilibrium. In all other situations, it is not.
by pmokh14B
Mon Jan 13, 2020 12:26 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: PV=nRT
Replies: 9
Views: 24

Re: PV=nRT

You can use it to convert between partial pressure and concentration.
by pmokh14B
Thu Jan 09, 2020 2:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc vs K
Replies: 6
Views: 49

Re: Kc vs K

K can be used to abbreviate for either Kc or Kp.
by pmokh14B
Thu Jan 09, 2020 2:48 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Re: Q and Ke: Small K value and Large K value
Replies: 7
Views: 23

Re: Q and Ke: Small K value and Large K value

the reaction quotient is basically the equilibrium constant at a moment where the reaction is not at equilibrium. It can provide insight into which direction the reaction will proceed.
by pmokh14B
Thu Jan 09, 2020 2:46 pm
Forum: Ideal Gases
Topic: K value
Replies: 14
Views: 60

Re: K value

Larger K value indicates that there are more products at equilibrium, and smaller K value indicates that there are more reactants at equilibrium.
by pmokh14B
Thu Jan 09, 2020 2:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K and Q
Replies: 5
Views: 19

Re: K and Q

Yes, because when Q is equal to K the ratio of products to the reactants at the moment in question is the concentrations for the equilibrium of that reaction.
by pmokh14B
Thu Jan 09, 2020 2:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G. 3
Replies: 5
Views: 34

Re: 5G. 3

I think for gasses you can use either concentration or pressure, because they can be converted.
by pmokh14B
Mon Dec 02, 2019 10:58 pm
Forum: Bronsted Acids & Bases
Topic: general q
Replies: 2
Views: 30

Re: general q

pH is usually used to refer to a solution. Depending on the ion in solution, the pH varies.
by pmokh14B
Mon Dec 02, 2019 10:56 pm
Forum: Polyprotic Acids & Bases
Topic: Polyprotic Question!
Replies: 12
Views: 831

Re: Polyprotic Question!

Polyprotic acids can essentially lose a proton (H+) more than once, or they can lose more than one H+.
by pmokh14B
Mon Dec 02, 2019 10:55 pm
Forum: Bronsted Acids & Bases
Topic: Final
Replies: 13
Views: 81

Re: Final

Everything should be in the syllabus. I assume anything else he includes would be mentioned during class.
by pmokh14B
Mon Dec 02, 2019 10:54 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pOH
Replies: 6
Views: 38

Re: pOH

I feel like most things will be in terms of pH, but I've seen problems where information is given in pOH which we'd need to use for calculations to maybe determine pH. For that you could use pH + pOH = 14
by pmokh14B
Mon Dec 02, 2019 10:52 pm
Forum: Bronsted Acids & Bases
Topic: strong v weak acids
Replies: 8
Views: 45

Re: strong v weak acids

I think you should have a general idea of them. At least the ones he mentioned in class.
by pmokh14B
Tue Nov 26, 2019 3:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam
Replies: 5
Views: 50

Re: Final Exam

180/500 so 36%
by pmokh14B
Tue Nov 26, 2019 3:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw Shape
Replies: 12
Views: 77

Re: Seesaw Shape

The angle would be less than 90 for axial, and less than 120 equatorial.
by pmokh14B
Tue Nov 26, 2019 3:39 pm
Forum: Significant Figures
Topic: Sig Figs on Tests
Replies: 24
Views: 282

Re: Sig Figs on Tests

You should usually give the answer in terms of the number of the value given to you in the problem with the least number of sig figs.
by pmokh14B
Tue Nov 26, 2019 3:38 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity Formula / Calculation
Replies: 5
Views: 75

Re: Molarity Formula / Calculation

You would either use
M=moles/Liters
or M1V1=M2V2 for dilutions.
Usually, just see which variables you have and manipulate the equations to determine the value you are looking for.
by pmokh14B
Tue Nov 26, 2019 3:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation state
Replies: 3
Views: 22

Re: Oxidation state

Oxidation states are basically the charge of different ions. They usually align with the group number of the atom, but for transition metals, they vary.
by pmokh14B
Mon Nov 18, 2019 2:18 pm
Forum: Dipole Moments
Topic: Dipole moments
Replies: 4
Views: 29

Re: Dipole moments

From the positive to the negative charge. Within a bond, not the entire molecule.
by pmokh14B
Mon Nov 18, 2019 2:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bonds in VSEPR
Replies: 11
Views: 56

Re: Bonds in VSEPR

Double and Triple bonds are accounted for in the same way that single bonds are: as a single bonding group/domain.
by pmokh14B
Mon Nov 18, 2019 2:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.1
Replies: 1
Views: 12

2E.1

2E. 1
for this question I thought the structure in part a (bent) must have a lone pair, but on the manual it says that it may have lone pairs. I don't understand how.
by pmokh14B
Mon Nov 18, 2019 2:13 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: H-bonds: 3F.5 (b)
Replies: 2
Views: 16

Re: H-bonds: 3F.5 (b)

The first molecule has a hydrogen attached to an Oxygen (one of the three atoms that make hydrogen bonding possible). diethyl ether doesn't have a hydrogen bonded to either N, O or F so it cannot exhibit hydrogen bonding
by pmokh14B
Mon Nov 18, 2019 2:12 pm
Forum: Student Social/Study Group
Topic: Test 2 Study Worksheets
Replies: 9
Views: 200

Re: Test 2 Study Worksheets

I think they might give us one during the peer review session.
by pmokh14B
Mon Nov 11, 2019 1:42 am
Forum: Dipole Moments
Topic: Hydrogen bonds
Replies: 17
Views: 88

Re: Hydrogen bonds

H bonds can only form with these three atoms.
by pmokh14B
Mon Nov 11, 2019 1:41 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Anions
Replies: 7
Views: 31

Re: Anions

no most metals are cations and will have polarizing power, not be polarizable.
by pmokh14B
Mon Nov 11, 2019 1:41 am
Forum: Electronegativity
Topic: dipole moments
Replies: 7
Views: 27

Re: dipole moments

Yes, the larger the difference in electronegativity the stronger the dipole moments of the molecule are.
by pmokh14B
Mon Nov 11, 2019 1:40 am
Forum: Bond Lengths & Energies
Topic: Size
Replies: 9
Views: 45

Re: Size

The larger the size of the atoms, the more likely their bond length will be greater.
by pmokh14B
Mon Nov 11, 2019 1:40 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs and Molecular Shape
Replies: 3
Views: 16

Re: Lone Pairs and Molecular Shape

The other atoms will be repelled by the lone electrons. The bonds between the central atom and peripheral ones contain negatively charged electrons which will tend to move as far as possible from the concentrated negative charge of the unpaired e-.
by pmokh14B
Sun Nov 10, 2019 4:48 pm
Forum: Lewis Structures
Topic: Oxygen
Replies: 8
Views: 39

Re: Oxygen

The first electron being removed from oxygen comes out of a full orbital. The electron-electron repulsion of the two e- decreases the magnitude of the force of the nucleus these electrons experience, decreasing the energy necessary to remove them from the atom.
by pmokh14B
Sun Nov 10, 2019 4:46 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 8
Views: 34

Re: Polarity

The greater difference in the electronegativity between two atoms, the more polar the bond between them will be because the more electronegative atom will have a greater pull on the electrons, and that side of the bond will be more negative.
by pmokh14B
Sun Nov 10, 2019 4:45 pm
Forum: Bond Lengths & Energies
Topic: Bond strength
Replies: 4
Views: 28

Re: Bond strength

Yes, single bonds are the weakest and longest, triple bonds are the shortest and strongest. Also, atomic radius comes into play. Smaller atoms tend to be closer and more strongly held together.
by pmokh14B
Sun Nov 10, 2019 4:44 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: D Subshell
Replies: 7
Views: 65

Re: D Subshell

10 electrons. The d subshell has 5 orbitals, each able to hold one pair, or two electrons, adding up to a max of 10 e-.
by pmokh14B
Sun Nov 10, 2019 4:43 pm
Forum: Lewis Structures
Topic: Midterm grades
Replies: 26
Views: 249

Re: Midterm grades

I think we should have the grades by Wednesday.
by pmokh14B
Mon Nov 04, 2019 9:53 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Lengths
Replies: 4
Views: 38

Re: Bond Lengths

Calculating bond length is just adding the radii of the two atoms bonded.
by pmokh14B
Mon Nov 04, 2019 9:53 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 4s or 3d first?
Replies: 14
Views: 116

Re: 4s or 3d first?

The 4s shell is filled first, any energy level that is higher is always filled first. But you write it second because it has higher energy and if any electron is removed from the atom it's removed from a higher energy shell first>
by pmokh14B
Mon Nov 04, 2019 9:44 pm
Forum: SI Units, Unit Conversions
Topic: Unit Conversion
Replies: 2
Views: 51

Re: Unit Conversion

I think you can provide the answer anyway, but sometimes it makes it easier to count sig figs when changing the units.
by pmokh14B
Mon Nov 04, 2019 9:42 pm
Forum: Lewis Structures
Topic: Double Bonds
Replies: 3
Views: 26

Re: Double Bonds

Using formal charges can help with this. A double bonded O with two lone pairs would have a formal charge of zero, whereas if it had a single bond with three unpaired e- the formal charge would be -1, which is unfavorable. The same thing goes for F.
by pmokh14B
Mon Nov 04, 2019 9:41 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 2
Views: 20

Re: Resonance

Yes but there can also be multiple structures with different formal charges. It's mostly dependent on the fact that double or triple bonds can be distributed to other bonds between the same to atoms in a molecule.
by pmokh14B
Mon Oct 28, 2019 8:57 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Drawing Lewis Structures
Replies: 5
Views: 56

Re: Drawing Lewis Structures

molecules with resonance, or those having atoms with expanded octets would be exceptions to bonding rules and the octet rule.
by pmokh14B
Mon Oct 28, 2019 8:56 pm
Forum: Properties of Light
Topic: Midterm formulas
Replies: 6
Views: 75

Re: Midterm formulas

I think we get all the information we had ont he 1st test.
by pmokh14B
Mon Oct 28, 2019 8:55 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Losing electrons
Replies: 3
Views: 30

Re: Losing electrons

3d fills up after 4s but 4s would still have higher energy because it is in the fourth energy level. Electrons are removed from the outermost/highest energy levels/shells.
by pmokh14B
Mon Oct 28, 2019 8:54 pm
Forum: Resonance Structures
Topic: Resonance Clarification
Replies: 8
Views: 45

Re: Resonance Clarification

A molecule/compound has resonance when there can be a double/triple bond placed at multiple bond sites without changing the orientation or atoms bonded.
by pmokh14B
Mon Oct 28, 2019 8:53 pm
Forum: Ionic & Covalent Bonds
Topic: grading
Replies: 5
Views: 64

grading

does anyone know how to check our grade in the class?
by pmokh14B
Mon Oct 21, 2019 12:54 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Kinetic Energy
Replies: 4
Views: 39

Re: Kinetic Energy

Kinetic energy is zero when the work function iis equal to the energy of the photon hitting the metal. If a problem asks how much energy is required to eject an electron from a surface of the metal you would also make KE equal to zero.
by pmokh14B
Mon Oct 21, 2019 12:52 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic Atoms
Replies: 6
Views: 51

Re: Isoelectronic Atoms

Isoelectronic atoms have the same number of electrons but one is an ion of some sorts and the two behave chemically differently. For example, F- and Ne both have 10 electrons, but behave differently when it comes to bonding, chemical reactions, etc....
by pmokh14B
Mon Oct 21, 2019 12:50 pm
Forum: Ionic & Covalent Bonds
Topic: Boiling Point
Replies: 4
Views: 352

Re: Boiling Point

For this, you would probably have to see which has a stronger type of intermolecular bonds, the stronger the bond between molecules, the more energy would be required to sever them, which would lead that molecule/compound to have a higher boiling point.
by pmokh14B
Mon Oct 21, 2019 11:22 am
Forum: Photoelectric Effect
Topic: KE energy & intensity
Replies: 5
Views: 39

Re: KE energy & intensity

The fact that increasing the frequency is what determined electrons being ejected or not showed the particle aspects of light. The intensity of light would just be shining more of the same frequency light on the metal, but increasing frequency increased energy and herefore emitted electrons from the...
by pmokh14B
Mon Oct 21, 2019 11:16 am
Forum: Properties of Light
Topic: calculating frequency of light
Replies: 4
Views: 42

Re: calculating frequency of light

Yes you assume that KE is zero because that will make the energy of the photon equal to the work function.
by pmokh14B
Fri Oct 18, 2019 2:23 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 97
Views: 20220

Re: Final Jitters

I usually meditate, and work out. and get a lot of sleep.
by pmokh14B
Fri Oct 18, 2019 2:21 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 4
Views: 27

Re: Rydberg Equation

You use rydberg's equation if you need to calculate the energy level of a hydrogen atom. at any level equal to n.
by pmokh14B
Fri Oct 18, 2019 2:20 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 56
Views: 390

Re: Best Way To Study?

I usually just review my notes until I understand the concepts. Then go through the suggested problems in the syllabus and make sure I can do all of them.
by pmokh14B
Fri Oct 18, 2019 2:19 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 6
Views: 33

Re: Photoelectric Effect

The electron would move to the surface of the metal, but because in the experiment the detector that records the KE of electrons has a positive charge the electron would be pulled away by charge of the detector.
by pmokh14B
Fri Oct 18, 2019 2:17 pm
Forum: Quantum Numbers and The H-Atom
Topic: Ground State [ENDORSED]
Replies: 5
Views: 78

Re: Ground State [ENDORSED]

In a ground state, the electrons of an atom occupy their lowest energy levels possible.
by pmokh14B
Sun Oct 13, 2019 6:38 pm
Forum: Molarity, Solutions, Dilutions
Topic: M1V1=M2V2
Replies: 11
Views: 139

Re: M1V1=M2V2

You use this equation during dilution questions. like when you're asked how much of one solution you would need to achieve certain molarity of another volume solution. Anytime you'd be given three of the variables of the equation and asked to find the other.
by pmokh14B
Sun Oct 13, 2019 6:36 pm
Forum: Properties of Light
Topic: Next test
Replies: 23
Views: 211

Re: Next test

Im pretty sure the information provided to us the first test is what we're given every time.
by pmokh14B
Sun Oct 13, 2019 6:34 pm
Forum: Limiting Reactant Calculations
Topic: About Finding Limiting Reactant
Replies: 7
Views: 89

Re: About Finding Limiting Reactant

You can leave it in either moles or grams. Unless the question itself asks for either grams or moles.
by pmokh14B
Sun Oct 13, 2019 6:32 pm
Forum: Properties of Light
Topic: Photoelectric Effect
Replies: 7
Views: 40

Re: Photoelectric Effect

any other molecules may interfere with the light and scatter the frequencies making the data less accurate.
by pmokh14B
Sun Oct 13, 2019 6:31 pm
Forum: Properties of Light
Topic: Manipulation of Equations
Replies: 6
Views: 31

Re: Manipulation of Equations

the -1 exponent just means the lambda is in the denominator.
by pmokh14B
Wed Oct 02, 2019 10:58 pm
Forum: Ideal Gases
Topic: Module Questions- Balancing Equations
Replies: 4
Views: 98

Re: Module Questions- Balancing Equations

4C4H10 +26O2(g) ---> 16CO2(g) + 20H2O(g)
you just balance the equation with 4 as the prefix for C4H10 and then count the moles of gas on both sides and count the ones on the right and subtract he moles of gas on the left. so for this it would be 16 + 20 - 26 = 10 moles of gas net.
by pmokh14B
Wed Oct 02, 2019 4:24 pm
Forum: Significant Figures
Topic: Quick General Question!
Replies: 5
Views: 86

Re: Quick General Question!

You should round it based on the 1st digit that wouldn't be included due to sig figs. So in this case 4.696 would be rounded to 4.70.
by pmokh14B
Wed Oct 02, 2019 4:22 pm
Forum: Significant Figures
Topic: E21b. Sig Figs
Replies: 5
Views: 76

Re: E21b. Sig Figs

it depends on the number of sig figs used for when you calculate molar mass.
by pmokh14B
Tue Oct 01, 2019 3:59 pm
Forum: Significant Figures
Topic: Question about significant figures and rounding a number
Replies: 4
Views: 66

Re: Question about significant figures and rounding a number

5.4545454545 would be 5, 5.5, 5.45, and 5.455 for 1, 2, 3 and 4 sig figs respectively.
5.55555555 would be 6, 5.6, 5.56, and 5.556 for 1, 2, 3 and 4 sig figs respectively.
by pmokh14B
Tue Oct 01, 2019 3:55 pm
Forum: Limiting Reactant Calculations
Topic: HW problem L1
Replies: 3
Views: 46

Re: HW problem L1

start with .3 mol CLO2 multiply by 1 mol Br2/6 mol ClO2, which will give you the moles of Br2 yielded. To find the mass of that amount of moles just multiply it by the molar mass.

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