Search found 111 matches

by Prasanna Padmanabham 4I
Sun Oct 20, 2019 6:50 pm
Forum: Quantum Numbers and The H-Atom
Topic: Spin numbers
Replies: 4
Views: 63

Re: Spin numbers

Electrons do spin, but the "up" and "down" -1/2 or +1/2 spin-orientation doesn't really matter, as long as you are consistent/mindfull of the antiparallel and parallel spinning. For more information, you should read this article: https://www.chemicool.com/definition/electron_spin...
by Prasanna Padmanabham 4I
Sun Oct 13, 2019 12:05 am
Forum: Photoelectric Effect
Topic: threshold energy
Replies: 6
Views: 58

Re: threshold energy

In order for the electron to be excited it needs a very specific amount of energy. If it gets "too much" or "too little" it cannot move up to a certain energy level. For example, an electron needs a very specific amount of energy to go from the 1st energy level to the 2nd. Since ...
by Prasanna Padmanabham 4I
Sat Oct 12, 2019 11:59 pm
Forum: DeBroglie Equation
Topic: Learning Objective
Replies: 1
Views: 51

Re: Learning Objective

This video does a really good job explaining it: https://www.youtube.com/watch?v=cYyFPFU6s_A
by Prasanna Padmanabham 4I
Sat Oct 12, 2019 11:57 pm
Forum: Photoelectric Effect
Topic: Mass of Electron
Replies: 6
Views: 64

Re: Mass of Electron

In summary, electrons don't weigh a lot in comparison to protons or neutrons and thats why electron masses are "ignored" when thinking about molar masses. But since you asked electrons weigh about: 9.109×10−31 kilograms or 5.489×10−4 atomic mass units.
by Prasanna Padmanabham 4I
Sat Oct 12, 2019 11:54 pm
Forum: Properties of Light
Topic: wavelike properties
Replies: 6
Views: 56

Re: wavelike properties

I'm not quite sure why electrons "need" to have wavelike properties, but I can say that through experimentation and mathematical models, scientists predict that electrons are a particle with wave-like properties.
by Prasanna Padmanabham 4I
Sat Oct 12, 2019 11:52 pm
Forum: Properties of Light
Topic: Large Objects
Replies: 7
Views: 83

Re: Large Objects

Well if you take a look at the De Broglie's formula WaveLength = H/mass*velocity, as mass increases the wavelength is so small that it basically doesn't look or behave like a wave.
by Prasanna Padmanabham 4I
Tue Oct 01, 2019 8:44 pm
Forum: Limiting Reactant Calculations
Topic: Homework Problem M.5
Replies: 2
Views: 41

Re: Homework Problem M.5

The problem: " Solve this exercise without using a calculator. The reaction 6 ClO2(g) + 2 BrF3(l) --> 6 ClO2F(s) + Br2(l) is carried out with 12 mol ClO 2 and 5 mol BrF 3 . (a) Identify the excess reactant. (b) Estimate how many moles of each product will be produced and how many moles of the e...
by Prasanna Padmanabham 4I
Tue Oct 01, 2019 8:32 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity Self test E1B
Replies: 2
Views: 40

Re: Molarity Self test E1B

3.14 mols of H2O means there are 6.28 mols of Hydrogen.
6.28 mols * 6.022 *10^23 atoms/mol = 3.78*10^24 atoms
by Prasanna Padmanabham 4I
Tue Oct 01, 2019 8:30 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilution and Molarity Questions
Replies: 8
Views: 80

Re: Dilution and Molarity Questions

Most dilution question, however wordy (or confusing the textbook might try to make it sound) they might be, come down to the M1 * V1 = M2 * V2 formula. I would try to make a list of the information given and then maybe what you don't know (which is usually just one variable) and then solve the equat...
by Prasanna Padmanabham 4I
Tue Oct 01, 2019 8:16 pm
Forum: Significant Figures
Topic: Rounding the elements
Replies: 12
Views: 157

Re: Rounding the elements

I tend to round to the nearest whole number when I'm trying to come up with like a guesstimate or if I'm doing like a multiple-choice test. For homework or free-response questions on tests, I tend to use the number on the periodic table of elements (so 1.008 for H and 15.99 for O). I round/do sig fi...
by Prasanna Padmanabham 4I
Tue Oct 01, 2019 8:08 pm
Forum: Limiting Reactant Calculations
Topic: Problem G5
Replies: 2
Views: 77

Re: Problem G5

A) The problem is asking "how much of the 250mL solution does the student need to obtain 2.15 mmol of Na+ ions?" 1. How many mols are in the 250 mL solution? a) Find molar mass of Na2CO3 which is 105.96 grams/mol b) 2.111g / 105.96g/mol = 0.0199 mols 2. Molarity of solution: 0.0199mols / 0...

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