Search found 32 matches

by kevinolvera1j
Sun Nov 10, 2019 8:07 pm
Forum: Dipole Moments
Topic: Identifying dipoles
Replies: 3
Views: 14

Identifying dipoles

Can you identify a dipole moment by analyzing its Lewis structure and formal charge or must you also consider electronegativity
by kevinolvera1j
Tue Nov 05, 2019 11:35 pm
Forum: Properties of Light
Topic: Wavelength and Type of Light
Replies: 3
Views: 27

Re: Wavelength and Type of Light

You should know the range in nm for visible light (700-400) and also the colors associated with each end of the spectrum (red for values closer to 700nm and violet for values closer to 400nm). As for the other ranges on the electromagnetic spectrum, you should generally know the order of EM radiatio...
by kevinolvera1j
Tue Nov 05, 2019 11:28 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: +- vs Uncertainty
Replies: 3
Views: 35

Re: +- vs Uncertainty

For a value like "32+-0.25 meters" you multiply the +- value by two to represent the total range in uncertainty of the value. The same logic applies if you are given the radius as a possible range of position for an electron to occupy. Since you want to represent the total range of uncerta...
by kevinolvera1j
Tue Nov 05, 2019 11:21 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect vs. De Broglie
Replies: 8
Views: 70

Re: Photoelectric Effect vs. De Broglie

The speed of light equation can only be used for Electromagnetic radiation since that equation, c=vλ is based on the propagation wave speed formula for values specific to light. The De Broglie equation is used for particles with momentum which means it is used for particles with mass, e.g. electrons...
by kevinolvera1j
Tue Nov 05, 2019 11:08 pm
Forum: Einstein Equation
Topic: e=hv used for particles?
Replies: 3
Views: 30

Re: e=hv used for particles?

E=hv can only be used for Electromagnetic radiation (light). To find the energy for other particles, use the kinetic energy equation: KE=(1/2)mv^2 since other particles have mass. If you want to find the wavelength for light, use λ=c/v; for particles with mass use the De Broglie equation: λ=h/p
by kevinolvera1j
Tue Nov 05, 2019 10:54 pm
Forum: DeBroglie Equation
Topic: Do neutrons have diffraction patterns?
Replies: 2
Views: 21

Re: Do neutrons have diffraction patterns?

Neutrons do have diffraction patterns; the De Broglie equation can be used for any object with momentum but observable wavelengths are only really present when a particle has very small mass such as electrons, neutrons, and protons. Objects on the scale of paperclips and cars have masses so great th...
by kevinolvera1j
Sat Nov 02, 2019 9:53 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1015118

Re: Post All Chemistry Jokes Here

nice joke,
Helium Helium Helium
by kevinolvera1j
Sat Nov 02, 2019 9:23 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: isoelectronic definition
Replies: 7
Views: 29

isoelectronic definition

Does being isoelectronic mean having the same number of electrons or having the same electron configuration?
by kevinolvera1j
Sat Nov 02, 2019 8:42 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: using indeterminancy
Replies: 3
Views: 39

using indeterminancy

If a speed is given such as 58 +-3 m/s is stated as the speed for a particle, does 3 need to always be multiplied by 2 in order to find the indeterminacy of a delta?
by kevinolvera1j
Sat Nov 02, 2019 8:15 pm
Forum: Properties of Light
Topic: Hz vs. frequency
Replies: 6
Views: 36

Re: Hz vs. frequency

When dealing with frequency, the unit needed for equations is Hz(s^-1), also the name of the greek letter is nu, not "v" since that would be confused too easily with velocity
by kevinolvera1j
Sat Nov 02, 2019 8:05 pm
Forum: Molarity, Solutions, Dilutions
Topic: initial and final variables
Replies: 4
Views: 39

initial and final variables

Is there an easy way to identify which volumes and molarities are first and second, or is it just a matter of reading the question very carefully?
by kevinolvera1j
Sat Nov 02, 2019 7:58 pm
Forum: Octet Exceptions
Topic: p-block elements
Replies: 2
Views: 17

Re: p-block elements

is the limit of valence electrons the same for all these 3rd period nonmetals or does it vary atom by atom?
by kevinolvera1j
Sat Nov 02, 2019 7:56 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Cu and Cr
Replies: 11
Views: 37

Re: Cu and Cr

So this means that this trend would also apply to silver as it applies to copper?
by kevinolvera1j
Sat Nov 02, 2019 7:52 pm
Forum: Bond Lengths & Energies
Topic: bond length
Replies: 6
Views: 30

bond length

Is it possible to find the length of a bond based on its strength or vice versa?
by kevinolvera1j
Sat Nov 02, 2019 7:43 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: periodic trends
Replies: 2
Views: 24

periodic trends

Is there a periodic trend for polarizing power?
by kevinolvera1j
Sat Nov 02, 2019 7:38 pm
Forum: Octet Exceptions
Topic: p-block elements
Replies: 2
Views: 17

p-block elements

Why are the p-block nonmetals in the 3rd period exceptions to the octet rule but the p-block nonmetals in the 2nd period are not?
by kevinolvera1j
Sat Nov 02, 2019 7:34 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge equation
Replies: 3
Views: 15

Formal charge equation

Can the equation for formal charge be rewritten as Valence electrons - (dots + lines)= formal charge?
by kevinolvera1j
Sun Oct 20, 2019 10:26 pm
Forum: Quantum Numbers and The H-Atom
Topic: electron spin
Replies: 4
Views: 24

electron spin

How can spin be visualized when thinking of electrons as waves and particles?
by kevinolvera1j
Sun Oct 20, 2019 10:02 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1015118

Re: Post All Chemistry Jokes Here

Using E=hv to find the frequency?

Nah bro, just Einstein checking your vibes
by kevinolvera1j
Sun Oct 20, 2019 7:57 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 50
Views: 260

Re: Advice for studying

The video modules on the Chem 14A website are excellent resource for initially learning, but to solidify information for long-term recall, forming a study group to do practice problems/tests is a really solid strategy.
by kevinolvera1j
Sun Oct 20, 2019 7:46 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: h bar formula [ENDORSED]
Replies: 4
Views: 36

Re: h bar formula [ENDORSED]

Since h bar is equal to (h/2π) it's very useful as shorthand where this value is used often like in Heisenberg indeterminacy equation and the Schrodinger equation. In the Heisenberg equation, the (h-bar/2) is equal to (h/4π) in case you come across the equation using h-bar.
by kevinolvera1j
Sun Oct 20, 2019 7:30 pm
Forum: *Shrodinger Equation
Topic: Schrodinger for exam
Replies: 9
Views: 96

Re: Schrodinger for exam

Understanding the equation at conceptual level is important but understanding the finer details of the equation is not as important for this level of chemistry
by kevinolvera1j
Sun Oct 13, 2019 2:08 pm
Forum: Properties of Light
Topic: Light intensity and Kinetic Energy
Replies: 7
Views: 46

Re: Light intensity and Kinetic Energy

When thinking about the energy of light, it's more useful to think about light as photons instead of waves. Intensity in terms of photons just refers to the amount of photons present. A higher intensity means more photons. The equations relating to the energy of light, E=hv, is specifically for one ...
by kevinolvera1j
Sun Oct 13, 2019 1:38 pm
Forum: Properties of Light
Topic: 1A3
Replies: 5
Views: 30

Re: 1A3

the speed of light, 3.0x10^8 m/s, remains the same for all EM radiation no matter the frequency or wavelength.
by kevinolvera1j
Sun Oct 13, 2019 1:21 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 68
Views: 948

Re: Rydberg equation [ENDORSED]

The rydberg constant is 3.29x10^15 hz when solving for frequency while in other equations it appears as 1.097x10^-7m in other equations. It's important to use the right version of the constant depending on what you are solving for.
by kevinolvera1j
Sun Oct 13, 2019 12:54 pm
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 66
Views: 949

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

When showing work it's important to include the right units in your work.
by kevinolvera1j
Sun Oct 13, 2019 12:39 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 1869

Re: Test 1 [ENDORSED]

Test 1 and 2 are both 50 points each and both have 50 minute time limits.
by kevinolvera1j
Thu Oct 03, 2019 8:21 pm
Forum: Einstein Equation
Topic: de brogile equation
Replies: 6
Views: 484

Re: de brogile equation

When dealing with Electromagnetic radiation (light) its useful to use the light equations : E=hν and c=λν, but keep in mind that these equations are specific to EM radiation. This is where De broglie's equation comes into play when dealing with the other particles (that have mass). De broglie's equa...
by kevinolvera1j
Thu Oct 03, 2019 7:44 pm
Forum: Properties of Light
Topic: EM Spectrum
Replies: 4
Views: 40

Re: EM Spectrum

You will most likely need to understand the relationship between each wavelength range (radio, microwave, infrared, visible light, UV, X-ray, and gamma) and their respective frequencies as it relates to the energy of each segment of the spectrum.
by kevinolvera1j
Thu Oct 03, 2019 7:40 pm
Forum: Properties of Light
Topic: Homework question
Replies: 1
Views: 33

Re: Homework question

You have to understand the relationship between all the terms in the formula for the speed of light. Since the speed of light is constant, what changes is the frequency and wavelength of the EM radiation.
by kevinolvera1j
Thu Oct 03, 2019 7:27 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 61
Views: 18465

Re: Final Jitters

Definitely make sure to get enough sleep the night before. Lack of sleep could lead to even more stress as you're too tired to perform at your best during the test leading to more test anxiety.
by kevinolvera1j
Thu Oct 03, 2019 7:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 117
Views: 1683

Re: Advice from a Medical Student - Part II [ENDORSED]

Thank you for sharing your personal experience. Do you have any advice for those of us unsure about our majors as first-years?

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