Search found 9 matches

by Jessica Pham_4B
Fri Oct 19, 2018 6:28 am
Forum: Photoelectric Effect
Topic: units
Replies: 12
Views: 284

Re: units

I'm a little confused if you look at question 1.9 I noticed that a lot of my answers came out as meters but I all ended up having to convert it to nanometers. How do I know when I can keep it meter vs. nanometers, vs. picometer, vs etc?
by Jessica Pham_4B
Fri Oct 19, 2018 5:41 am
Forum: Properties of Electrons
Topic: HW help 1.15
Replies: 1
Views: 80

HW help 1.15

Does anyone get this question or how to solve it. My math keeps coming out wrong :( In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spect...
by Jessica Pham_4B
Fri Oct 19, 2018 5:11 am
Forum: Properties of Electrons
Topic: Rydberg Formula 1.13
Replies: 3
Views: 115

Rydberg Formula 1.13

Hi I'm having some trouble solving this question someone please confirm which one is the correct constant? Is rydberg constant: 1.097 x 10^7 or is it 1.097 x 10^-7 ? Ot is this both wrong? Use the Rydberg formula for atomic hydrogen to calculate the wavelength of radiation generated by the transitio...
by Jessica Pham_4B
Fri Oct 12, 2018 12:17 am
Forum: SI Units, Unit Conversions
Topic: Homework for Week 2
Replies: 16
Views: 371

Re: Homework for Week 2

My TA just said that as long as you do 7 correctly (7 that you have not turned in previously) then you are good! You can still do it problems from Fundamentals!
by Jessica Pham_4B
Fri Oct 12, 2018 12:14 am
Forum: SI Units, Unit Conversions
Topic: Rounding Off of 5
Replies: 7
Views: 315

Re: Rounding Off of 5

What you're saying I think is right 4.45 rounded is 4.4. Cause when the number end in 5 you round to the even number. This is what it said on Lavelle's cheat sheet: IF LAST DIGIT IS ABOVE 5: ROUND UP (2 sf then 2.36 is 2.4) • IF LAST DIGIT IS BELOW 5: ROUND DOWN (1sf then 2.36 is 2) • IF LAST DIGIT ...
by Jessica Pham_4B
Fri Oct 12, 2018 12:07 am
Forum: SI Units, Unit Conversions
Topic: Units
Replies: 8
Views: 250

Re: Units

I'm pretty sure you get docked points, cause putting down units during conversion counts as showing your work I believe. You might as well put it to be safe?
by Jessica Pham_4B
Fri Oct 05, 2018 11:33 am
Forum: Molarity, Solutions, Dilutions
Topic: Fraction of total mass due to oxygen?
Replies: 1
Views: 92

Fraction of total mass due to oxygen?

E.29 A chemist measured out 8.61 g of copper(II) chloride tetrahydrate, CuCl2 4H2O. (a) How many moles of CuCl2 4H2O were measured out? 0.0417 mol (b) How many moles of Cl ions are present in the sample? .0834 mol (c) How many H2O molecules are present in the sample? (d) What fraction of the total m...
by Jessica Pham_4B
Fri Oct 05, 2018 1:50 am
Forum: Significant Figures
Topic: Sig Figs
Replies: 5
Views: 122

Re: Sig Figs

This is what my TA told me. You should do the calculation with all the numbers given and just determine sig figs at the end. Like for example 2.10 x 6.005 = 12.6105 -> then you can just use determine from 2.10 to use just 3 sig figs in your actual answer so it'll be 12.61. To summarize you can just ...
by Jessica Pham_4B
Fri Oct 05, 2018 1:45 am
Forum: Significant Figures
Topic: sig figs urgent question!
Replies: 12
Views: 690

Re: sig figs urgent question!

It is necessary to count the numbers between the non-zero as well so in this case you have 4 sig figs, we can practice sig figs later if you want Jackie :) I have a worksheet my TA gave me that helped a lot which I can share with you.

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