Search found 77 matches

by eduardomorales5
Mon Mar 16, 2020 1:04 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Catalyst
Replies: 3
Views: 29

Catalyst

How can we tell which compound is the catalyst based on the elementary reactions? How would we determine the reaction mechanism when we are not told which reaction is slow and which is fast?
by eduardomorales5
Mon Mar 16, 2020 1:03 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Initial vs Unique Rates
Replies: 3
Views: 22

Initial vs Unique Rates

What is the difference between an initial rate for a reactant, and its unique rate? Does this tie into the inverse of the stoichiometric coefficient?
by eduardomorales5
Mon Mar 16, 2020 1:00 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation Energy
Replies: 3
Views: 20

Activation Energy

How does an increase in temperature lower the activation energy? If we were given two reactions, 1 endothermic and the other exothermic, how would an increase in temperature affect the rate constant?
by eduardomorales5
Fri Mar 13, 2020 5:29 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Irreversible System
Replies: 2
Views: 34

Irreversible System

How would we find the change in entropy for an irreversible system? Why would the entropy of the surroundings equal 0?
by eduardomorales5
Fri Mar 13, 2020 5:25 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: factors of Gibbs free energy
Replies: 2
Views: 26

Re: factors of Gibbs free energy

The equilibrium constant, K, shows where the system reaches equilibrium, so that no work is being done by the system (Gibbs=0). Different value of Q will show how much work a system can do, and the spontaneity of the system. Because the Gibbs free energy shows the maximum available work a system can...
by eduardomorales5
Fri Mar 13, 2020 5:21 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: 3rd law
Replies: 3
Views: 34

Re: 3rd law

As temperature reaches zero, the entropy of the system reaches a constant value that reflects the degeneracy of the ground state.
by eduardomorales5
Fri Mar 13, 2020 5:20 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpies
Replies: 1
Views: 36

Enthalpies

If an ice cube is dropped into a hot coffee cup at 300K, how would we be able to determine how much ice would be needed to drop the temperature to 250K?
by eduardomorales5
Fri Mar 13, 2020 5:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Reduction Potential
Replies: 4
Views: 21

Reduction Potential

If the reduction potentials are both negative, do we take the largest value as the cathode, and the smallest as the anode?
by eduardomorales5
Fri Mar 13, 2020 5:17 pm
Forum: Second Order Reactions
Topic: Second Order Rxn
Replies: 2
Views: 22

Second Order Rxn

How would the graph of a second order reaction look like? What can you find with the second order equation ?
by eduardomorales5
Wed Mar 04, 2020 9:13 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: platinum
Replies: 2
Views: 26

Re: platinum

If the compounds in the redox reaction are in aqueous or gaseous form, they need a conductor to help with the movement of electrons from one cell to the other. Platinum Pt(s) is a common conductor that can be used.
by eduardomorales5
Wed Mar 04, 2020 9:12 pm
Forum: General Rate Laws
Topic: First vs Second Order Rate Laws
Replies: 3
Views: 38

First vs Second Order Rate Laws

What is the difference between a first and second order reaction? Does increasing the concentration of a reactant increase the rate of the reaction?
by eduardomorales5
Wed Mar 04, 2020 9:09 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Changes in Q
Replies: 3
Views: 53

Changes in Q

If we decreased the concentration of a reactant, what would happen to the cell potential of the cell? If we decreased the mass of a reactant, what would happen to the cell potential?
by eduardomorales5
Wed Mar 04, 2020 9:07 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Standard Cell Potentials
Replies: 1
Views: 17

Standard Cell Potentials

What does it mean if the standard cell potential is negative? Will it be an oxidation reaction?
by eduardomorales5
Wed Mar 04, 2020 9:05 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Change in Internal Energy
Replies: 3
Views: 77

Change in Internal Energy

When would we use the change in U = q +w, and when would we use the change in U= H-PVdv? Does it matter which equation you use when calculating the change in internal energy?
by eduardomorales5
Thu Feb 27, 2020 7:25 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 2
Views: 27

Cell Diagrams

Do electrolytes flow to the anode or cathode end? What is the purpose of the electrolytes in the redox reaction?
by eduardomorales5
Thu Feb 27, 2020 7:23 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 3
Views: 25

Cell Diagrams

When drawing the cell diagrams, do we include water or represent it as H+ ions?
by eduardomorales5
Thu Feb 27, 2020 7:23 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gibbs Free Energy
Replies: 2
Views: 32

Gibbs Free Energy

Conceptually, why does a negative cell potential produce a positive (non-spontaneous) Gibbs free energy?
by eduardomorales5
Thu Feb 27, 2020 7:21 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Non-Standard Potential
Replies: 3
Views: 31

Non-Standard Potential

How can we determine if the equilibrium constant of a reaction is greater than or less than 1 based on the Nernst equation?
by eduardomorales5
Thu Feb 27, 2020 7:20 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration Cells
Replies: 6
Views: 35

Concentration Cells

Whats the difference between a concentration cell and a galvanic cell? Does one of them do more work than the other cell?
by eduardomorales5
Wed Feb 19, 2020 4:23 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs free energy
Replies: 4
Views: 27

Gibbs free energy

What does it tell us if the Gibbs free energy of the products is greater than the Gibbs free energy of the reactants?
by eduardomorales5
Wed Feb 19, 2020 4:21 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy
Replies: 2
Views: 26

Gibbs Free Energy

If the Gibbs free energy value is positive, does it also imply that the reaction is endothermic? Or could the reaction also be exothermic?
by eduardomorales5
Wed Feb 19, 2020 4:19 pm
Forum: Balancing Redox Reactions
Topic: Redox reactions
Replies: 2
Views: 26

Redox reactions

Why do we have to include the OH- or H+ if a reaction is placed in an acidic or basic solution when balancing a redox reaction?
by eduardomorales5
Wed Feb 19, 2020 4:17 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Potentials
Replies: 2
Views: 20

Cell Potentials

How does the standard electrode potential differ from the electrode potential?
by eduardomorales5
Wed Feb 19, 2020 4:16 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox
Replies: 5
Views: 34

Balancing Redox

How do you know what charge a compound has? Is it usually given or do you simply have to memorize the charges of molecules?
by eduardomorales5
Tue Feb 11, 2020 10:42 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Decreasing pressure
Replies: 7
Views: 97

Decreasing pressure

Why does decreasing pressure cause the reaction to shift toward the side that has more moles?
by eduardomorales5
Tue Feb 11, 2020 10:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solids and Equilibrium Constant
Replies: 2
Views: 18

Solids and Equilibrium Constant

Why does adding more solid to a reaction not cause the equilibrium to shift? If I added more of a reactant, shouldn't the products increase as well regardless if it is solid?
by eduardomorales5
Tue Feb 11, 2020 10:39 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy
Replies: 4
Views: 47

Entropy

Why does increasing the temperature cause an increase in the entropy of the system?
by eduardomorales5
Tue Feb 11, 2020 10:37 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous
Replies: 23
Views: 134

Spontaneous

How do we determine if a reaction is spontaneous? What does having a Gibbs free energy of 0 mean relative to the energy of the reaction?
by eduardomorales5
Tue Feb 11, 2020 10:35 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: State Function
Replies: 3
Views: 31

State Function

What is the difference between a state function and a path function? Are entropy, enthalpy and Gibbs free energy all examples of state functions?
by eduardomorales5
Fri Feb 07, 2020 3:03 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: HW 4.15
Replies: 2
Views: 49

HW 4.15

How would you solve this problem? Hydrochloric acid oxidizes zinc metal in a reaction that produces hydrogen gas and chloride ions. A piece of zinc metal of mass 8.5 g is dropped into an apparatus containing 800.0 mL of 0.500 m HCl(aq). If the initial temperature of the hydrochloric acid solution is...
by eduardomorales5
Fri Feb 07, 2020 2:28 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy
Replies: 2
Views: 23

Entropy

Why is the entropy of the universe always positive? And why does a larger temperature mean it has a smaller change in entropy?
by eduardomorales5
Fri Feb 07, 2020 2:27 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Change in internal energy
Replies: 3
Views: 23

Change in internal energy

When is the change in internal energy equal to 0? When is it equal to q? And what does it mean when the system is isothermal and irreversible?
by eduardomorales5
Fri Feb 07, 2020 2:25 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy
Replies: 2
Views: 22

Entropy

What exactly is residual entropy and how would we calculate it if we were given a 50 molecules of NH3?
by eduardomorales5
Tue Feb 04, 2020 11:05 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: negative entropy
Replies: 4
Views: 27

Re: negative entropy

Negative entropy means there is a decrease in the disorder of the system or increase in the order of the system.
by eduardomorales5
Tue Feb 04, 2020 11:02 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: isothermal reversible expansion
Replies: 2
Views: 21

Re: isothermal reversible expansion

Yes, when the reaction is isothermal and reversible, you use that equation to calculate the change in entropy of the system.
by eduardomorales5
Tue Feb 04, 2020 11:00 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4D.7
Replies: 1
Views: 25

4D.7

What would be the net moles of the reaction if the reaction is OF2 + H20--> O2 + 2HF. How would I solve the problem given that I have 1 mole of OF2 and the change in enthalpy is equal to -318kJ?
by eduardomorales5
Tue Feb 04, 2020 10:47 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: reversible v irreversible work
Replies: 3
Views: 28

Re: reversible v irreversible work

For reversible work, the pressure gradually decreases as the volume of the system expands. At the start, the pressure outside the system matches the pressure inside of the system, so through infinitesimal changes in pressure, the volume of the gas will expand, and keep an equilibrium state with its ...
by eduardomorales5
Tue Feb 04, 2020 10:39 am
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: Microstate
Replies: 1
Views: 13

Microstate

What exactly are microstates and how do they help determine the disorderness(entropy) of a system?
by eduardomorales5
Sat Feb 01, 2020 1:42 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy of Rxn
Replies: 9
Views: 59

Enthalpy of Rxn

If the enthalpy of a reaction is 300kJ/mol, and we have 0.05mol of th substance, do we multiply or divide by the moles of the substance to find the enthalpy of the reaction?
by eduardomorales5
Thu Jan 30, 2020 9:09 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity
Replies: 2
Views: 28

Heat Capacity

If we are given grams of a substance, is it better to convert it to moles and use the molar heat capacity, or should I keep it in grams?
by eduardomorales5
Thu Jan 30, 2020 9:08 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity
Replies: 2
Views: 29

Heat Capacity

How can we use the standard enthalpy of formation to calculate the enthalpy of a reaction given a certain amount of moles. For instance, if we find the enthalpy of the reaction, how do you find the enthalpy at a specific mole value (i.e. 0.4 mol of a reactant)?
by eduardomorales5
Thu Jan 30, 2020 9:05 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calorimeter
Replies: 4
Views: 49

Calorimeter

If we are given the heat capacity of the calorimeter, do we use that heat capacity to calculate the heat released by a chemical reaction? Or do we use the heat capacity of the molecules in the calorimeter?
by eduardomorales5
Thu Jan 30, 2020 9:03 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Enthalpy at Constant Pressure
Replies: 2
Views: 22

Enthalpy at Constant Pressure

Is enthalpy at constant pressure mean that the system has to be at 1.0atm and 25 degrees celsius? Or is it simply that it should be at 25 degrees celsius?
by eduardomorales5
Thu Jan 30, 2020 8:31 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Homework question 4B.13
Replies: 2
Views: 27

Re: Homework question 4B.13

Make sure you use the correct gas constant. You probably used the 0.82 atm.L/mol.K, which got you the value that you have. Use 8.3145 J/mol.K and you should get the answer from the manual.
by eduardomorales5
Thu Jan 23, 2020 5:41 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature
Replies: 6
Views: 54

Temperature

Why does temperature affect the K? Does increasing heat for an exothermic reaction shift it to the reactants or products?
by eduardomorales5
Thu Jan 23, 2020 5:39 pm
Forum: Ideal Gases
Topic: Pressure
Replies: 2
Views: 22

Pressure

Why doesn't adding an inert gas to a reaction increase the pressure and thus move the direction of the reaction a certain way?
by eduardomorales5
Thu Jan 23, 2020 5:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Hw problem 5.35 help
Replies: 3
Views: 38

Re: Hw problem 5.35 help

To calculate the equilibrium constant, you use the ratio of the equilibrium concentrations of the products over the reactants. At equilibrium, the concentrations of A,B, and C should not change. We see that at the end of the graph. A was the reactant, while B and C were the products. The equilibrium...
by eduardomorales5
Thu Jan 23, 2020 5:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Buffers
Replies: 2
Views: 14

Buffers

How do buffers differ from the usual way that we calculate the concentrations using the ICE table?
by eduardomorales5
Thu Jan 23, 2020 5:23 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: pKa/Pkb vs pH/pOH
Replies: 3
Views: 30

Re: pKa/Pkb vs pH/pOH

The pKa and pKb tells us how well a compound dissociates in a solution(how fully it releases hydrogen or hydroxide ions) and tells us the strength of the acid or base. The pH tells us the concentration of H30+ ions that a compound gives off when placed in a solution, while the pOH tells us the conce...
by eduardomorales5
Tue Dec 03, 2019 10:11 pm
Forum: Bronsted Acids & Bases
Topic: Acids and Bases
Replies: 2
Views: 37

Acids and Bases

Which is a stronger acid, CH3CH2OH or CH3COOH, and why? Is it due to the extra electronegative atom(the oxygen) or because of its resonance?
by eduardomorales5
Sun Nov 17, 2019 4:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.19 b
Replies: 2
Views: 26

Re: 2E.19 b

By drawing VSEPR structure, it takes the shape of a tetrahedral for both of the carbons. It would look like two tetrahedral bonded together by the carbon. So H3C-CH2BeH. The H3C would be a tetrahedral and so would the CH2BeH.
by eduardomorales5
Sun Nov 17, 2019 12:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Polarity
Replies: 3
Views: 29

Re: Determining Polarity

You would draw out the lewis structure and then compare the electronegativity of each of the atoms attached to the central atom. If there is an uneven distribution of charge throughout the molecule, then you would call the molecule polar.
by eduardomorales5
Sun Nov 17, 2019 12:44 pm
Forum: Dipole Moments
Topic: ion-dipole moments
Replies: 3
Views: 31

Re: ion-dipole moments

An ion-dipole interaction is stronger than a dipole-dipole interaction because an ion has a stronger charge than a polar molecule.
by eduardomorales5
Sun Nov 17, 2019 12:37 pm
Forum: Dipole Moments
Topic: Dipole moments in trigonal bipyramidal shaped molecules
Replies: 4
Views: 50

Re: Dipole moments in trigonal bipyramidal shaped molecules

For molecules that are highly symmetrical, like the trigonal bipyramidal, octahedral, and tetrahedral, the individual dipoles will usually cancel out, as they are typically non-polar molecular structures. However, if some of the atoms attached to a trigonal bipyramidal molecule, for example, are not...
by eduardomorales5
Sun Nov 17, 2019 12:25 pm
Forum: Dipole Moments
Topic: Polar vs. Non-polar bonds
Replies: 2
Views: 41

Re: Polar vs. Non-polar bonds

You could compare the sizes of the two atoms and the number of protons that each atom has. Larger atoms have more orbitals and thus a greater amount of shielding electrons. The effective nuclear charge would not be as great as it would be for smaller atoms, and will be less able to pull electrons to...
by eduardomorales5
Sat Nov 16, 2019 6:49 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 2
Views: 65

Electronegativity

What exactly causes an atom to have more electronegativity than other atoms?
by eduardomorales5
Sat Nov 16, 2019 6:48 pm
Forum: Dipole Moments
Topic: Dipole Moment
Replies: 3
Views: 44

Dipole Moment

Does electronegativity have to do with a dipole moment? Are we supposed to know how to calculate a dipole moment on a test?
by eduardomorales5
Sat Oct 26, 2019 7:54 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 3
Views: 36

Electron Configuration

So how does Lavelle want us to write the electron configuration of transition metals? Like for instance Vanadium, does he want us to write it like [Ar]4s2 3d3 or [Ar]4s1 3d4?
by eduardomorales5
Fri Oct 25, 2019 7:09 pm
Forum: Trends in The Periodic Table
Topic: Effective Nuclear Charge
Replies: 2
Views: 30

Re: Effective Nuclear Charge

The equation is Zeff= Z-S, where Z is the atomic number and S is the number of shielding electrons(non-valence electrons).
by eduardomorales5
Fri Oct 25, 2019 7:01 pm
Forum: DeBroglie Equation
Topic: Post-assessment question 34
Replies: 2
Views: 39

Re: Post-assessment question 34

I believe the answer was 1.00 x 10^5m/s, not the answer you gave. The rest of you answer is correct, in that it is reasonable because the electron is moving slower than the speed of light.
by eduardomorales5
Fri Oct 25, 2019 6:49 pm
Forum: Trends in The Periodic Table
Topic: First vs. Second Ionization Energies
Replies: 2
Views: 29

Re: First vs. Second Ionization Energies

Ionization energy is the energy required to remove an electron from the valence shell. By removing one electron, there are more protons than electrons now, and thus the electrons are more tightly bound to the nucleus. Thus, the second ionization energy will be higher than the first now that it has t...
by eduardomorales5
Thu Oct 24, 2019 3:57 pm
Forum: Ionic & Covalent Bonds
Topic: HW 2.A.1 (c) - valence electrons for elements in d block
Replies: 1
Views: 41

Re: HW 2.A.1 (c) - valence electrons for elements in d block

An element is most stable when its orbitals are full or half-full. In the case of Manganese, it has 7 valence electrons as you can see from its electron configuration [Ar]4s2 3d5, by counting the 2 electrons from the s-orbital and the 5 from the d-orbital. Because it is at a half filled d-orbital, i...
by eduardomorales5
Thu Oct 24, 2019 3:48 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2A.5: What happens with s and d orbitals?
Replies: 2
Views: 30

Re: 2A.5: What happens with s and d orbitals?

The electron configurations of Thallium is [Xe]4f14 5d10 6s2 6p1. Because it is Tl^+3, Thallium has lost 3 electrons. You remove the electrons in the order of the highest energy level, which in this case, is n=6. When you take the 3 away, you are left with [Xe]4f14 5d10.
by eduardomorales5
Sun Oct 20, 2019 4:06 pm
Forum: Properties of Electrons
Topic: Shared Electrons
Replies: 4
Views: 60

Re: Shared Electrons

Hund's Rule tells us that because of the repulsion of electrons, they will first try to occupy different orbitals while having parallel spin, which has less energy than opposite spin electrons. Because there are 3 p orbitals, they will try to fill up each orbital first until they other electrons beg...
by eduardomorales5
Sun Oct 20, 2019 3:50 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: h bar formula [ENDORSED]
Replies: 4
Views: 67

Re: h bar formula [ENDORSED]

The more correct one to use is the h/4pi.
by eduardomorales5
Sun Oct 20, 2019 3:47 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 5
Views: 49

Electron Configuration

What exactly is the order that electrons fill up orbitals? With what atoms do we start using the d-orbital?
by eduardomorales5
Sun Oct 20, 2019 3:44 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 7
Views: 87

Quantum Numbers

How do we know when to put the spin number? How does an electron's spin affect its behavior?
by eduardomorales5
Sat Oct 12, 2019 7:43 pm
Forum: Properties of Electrons
Topic: Wavelength and Electrons
Replies: 4
Views: 65

Re: Wavelength and Electrons

The wavelength of an electron is Wavelength=10^-12m
by eduardomorales5
Sat Oct 12, 2019 7:40 pm
Forum: Properties of Electrons
Topic: History of the QM Equations
Replies: 2
Views: 27

Re: History of the QM Equations

The three fundamental equations were developed in the 1920s.
by eduardomorales5
Sat Oct 12, 2019 7:39 pm
Forum: Properties of Electrons
Topic: Diffraction
Replies: 2
Views: 25

Re: Diffraction

Constructive interference is when the peaks and troughs of two waves match and thus increase the amplitude of the wave.
by eduardomorales5
Sat Oct 12, 2019 7:34 pm
Forum: Properties of Electrons
Topic: Planck's constant
Replies: 2
Views: 45

Re: Planck's constant

Yes Lavelle explained it within his video modules.
by eduardomorales5
Sat Oct 12, 2019 7:33 pm
Forum: Properties of Electrons
Topic: Weight of Particles
Replies: 4
Views: 40

Re: Weight of Particles

The mass of an electron is 9.109x10^-31. The mass of a proton and neutron is 1.67x10^-27.
by eduardomorales5
Fri Oct 04, 2019 8:45 am
Forum: SI Units, Unit Conversions
Topic: Bond Length
Replies: 5
Views: 86

Re: Bond Length

Bond length is the distance between the nuclei of two bonded atoms.
by eduardomorales5
Fri Oct 04, 2019 8:43 am
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 118
Views: 26562

Re: Final Jitters

Make sure you study repeatedly over a long period of time. Don't cram the night before or that will contribute to your anxieties. Sleep and eat well, and take deep breathes to calm yourself down. Before the test, it is best not to think about it at all to avoid starting up any unnecessary anxiety. W...
by eduardomorales5
Fri Oct 04, 2019 8:36 am
Forum: Empirical & Molecular Formulas
Topic: When should one start rounding in a problem?
Replies: 11
Views: 177

Re: When should one start rounding in a problem?

It is best to round by the end of the problem and keep the precision of numbers during the problem to reach a more accurate answer. If you round too early, you might get a slightly lower or higher answer than what is correct. I would keep it at 1.007 for the sake of accuracy.
by eduardomorales5
Fri Oct 04, 2019 8:35 am
Forum: SI Units, Unit Conversions
Topic: Why do we always need grams when solving a problem?
Replies: 6
Views: 86

Re: Why do we always need grams when solving a problem?

It is the accepted base SI unit that helps to standardize measurements so that scientists can more easily compare their findings using the same unit measurement.
by eduardomorales5
Fri Oct 04, 2019 8:30 am
Forum: Significant Figures
Topic: How does one read sig figs?
Replies: 3
Views: 72

Re: How does one read sig figs?

Any non-zero number is significant. A zero is significant if it precedes the decimal point (e.g. 0.2) or if after the decimal point, precedes a non-zero(e.g. 0.004). So it given 500400, it would have 4 sig figs because the two zeroes in the middle precedes a non-zero, which in this case is 4. The ze...

Go to advanced search