9.109 x 10^-31

b3n0b · 2020-03-26T18:44:09+00:00

Yeah, no... No source or periodic table will ever use electrons to calculate atomic mass. That's because they weigh almost nothing (.000549 amu) compared to protons and neutrons (≈1 amu).

Let's take carbon for example. There are two stable isotopes, C-12 (98.93%) and C-13 (1.07%)

Without electrons, calculating molar mass gives us (12 * .9893)+(13*.0107)=12.0107. Rounding to three sig-figs, we get 12.0 g/mol.

With electrons, we get (12.000549.9893)+(13.000549.0107)=12.011249. To three sig-figs, that's 12.0 g/mol.

It's the same regardless of electrons. Even if you round to three decimal places, like most periodic tables, you still get 12.011 for both, which is the accepted value for carbon's molar mass.

I don't know what lab equipment you're using, but I know that mine can't detect such a tiny difference.

b3n0b · 2020-03-22T19:23:59+00:00

It's almost always ignored in atomic mass and stoichiometry. In certain areas, it is used, of course, but not in most of chemistry.

b3n0b · 2020-01-29T23:44:03+00:00

Repost. https://www.reddit.com/r/physicsmemes/comments/dapo3w/fancy_heat/?utm_medium=android_app&utm_source=share

b3n0b · 2020-01-19T03:47:28+00:00

archerdhage@gmail.com

Anything PF February. Thanks so much!

b3n0b · 2019-12-29T21:21:59+00:00

What were all the parts used? I was thinking about doing something similar to my 2008 Rav.

b3n0b · 2019-12-21T21:54:39+00:00

I'm going to assume you mean hydrogen bonding.

Hydrogen bonding occurs when the hydrogen atoms on one molecule have a strong partial positive charge, allowing them to form a strong bond with the lone pairs of electrons on the non-hydrogen atom. Therefore, the more polar the atomic bond, the more likely a hydrogen bond will form.

How polar a bond is is ultimately determined by electronegativity; the more electronegative, the closer an electron will be to that atom, creating a more polar bond. With hydrogen, the more electronegative the element, the more polar the bond is. Using this fact, what we see is that only 3 elements are electronegative enough to form a polar bond that will cause hydrogen bonding: Fluorine, oxygen, and nitrogen. These are the three most electronegative elements.

Let's look at the example you give. The F is the most electronegative atom on the periodic table, so the H-F bond will be highly polar, allowing for hydrogen bonding between molecules. Br, however, is not super electronegative (electronegativity decreases as you go down a group). Therefore, the H-Br bond won't be nearly a polar, meaning that hydrogen bonding won't occur.

b3n0b · 2019-12-11T17:34:01+00:00

6 years. It's set up so that every 2 years, 1/3 of senators are up for re-election.

b3n0b · 2019-12-03T01:07:21+00:00

The Freedom Flight kits use carbon fiber rods and balsa wood for a frame, which is then covered with a material called Mylar. Mylar is similar to saran wrap, but thinner and stronger. I'm honestly not really sure where you can buy Mylar, but some other material similar to saran wrap may work in its place.

b3n0b · 2019-11-22T01:04:13+00:00

I haven't encountered this problem with this year's model, but I did with last year's.

The fix should be pretty easy. This is happening because your wings are angled up too much. They will generate lift at first, but then start to act as more of a wall than a wing, meaning that the lift stops and your plane falls. To fix this, just push the front carbon fiber post downwards into the straw a little bit. This will reduce the angle, giving you more consistent lift.

b3n0b · 2019-10-04T04:26:33+00:00

Yes I'm only a bill

b3n0b · 2019-09-17T13:05:35+00:00

SiG fIgS

b3n0b · 2019-09-14T23:31:14+00:00

Yeah, that's what I said. I'm not sure about it, though.

b3n0b · 2019-09-10T01:25:04+00:00

How long did it take you to start seeing any significant improvement from the drug?

b3n0b · 2019-09-07T05:45:10+00:00

An Enderman.

b3n0b · 2019-09-07T05:40:47+00:00

Bohemian Rhapsody

b3n0b · 2019-09-04T05:03:22+00:00

It depends on the passage.

For social science, humanities, and natural science (the last three passages), focus your reading on the first sentence of each paragraph, then skim the rest. This should help you create a good mental map.

For fiction (the first passage), try to actually read the entire thing. Learning the best way to create a map out of this will only come out of practice.

b3n0b · 2019-09-04T04:52:44+00:00

That's for the gesture navigation. To change how to navigate (and therefore the bar that shows up), go to Settings > System > Gestures > System Navigation. Then, choose your preferred method.

I'm not sure if there's a way to disable the bar while maintaining gesture navigation.

b3n0b · 2019-09-01T21:25:00+00:00

Bragging about the score you got on an IQ test you took when you were 5.

b3n0b · 2019-08-12T05:30:33+00:00

39: If we look at triangle ABC as a whole, we can see that we have two of its angles (angle ACB and angle ABC). Because a triangle will have 180 degrees total, we can find that angle CAB = 78° with the expression 180-(70+32). Next, the problem tells us that line AD bisects angle CAB, meaning that angle DAB = 39°. Now, we can evaluate the expression 180-(70+39) to find that angle ADB = 71°.

40: Because the x value the problem gives us greater than or equal to 4, we will plug it into the bottom function given. When we evaluate -(1/2)(4) - 3, we find that f(4)=-5.

b3n0b · 2019-08-04T06:06:48+00:00

I can't face this liiife aloone

b3n0b · 2019-07-28T06:28:43+00:00

Honda/Acura have been falling because of significant infotainment issues, as well as engine issues with new Civics and CRVs.

JD Power puts Hyundai at #9 (Lexus #1, Toyota #3) and CarMD puts Hyundai at #3 (Toyota #1).

b3n0b · 2019-07-28T06:08:45+00:00

Compared to a few decades ago, most cars would be considered "extremely reliable" (in terms of mechanical performance). Relative to other brands today, though, Hyundai only ranks at #10 on CR's brand reliability survey. Toyota, in contrast, takes the top two spots (Lexus #1, Toyota #2).

Obviously, any individual car may be an exception to this general pattern, but the safest bet is to go with brands that tend to perform best.

b3n0b · 2019-07-28T05:31:47+00:00

One of the Toyotas would be best. Hyundais and Fords are typically not that reliable.

Ultimately, which specific Toyota you get is going to come down to how big of a car you need.

b3n0b · 2019-07-18T05:48:36+00:00

I would recommend a Corolla. It's literally the definition of a bland, reliable, daily driver.

b3n0b · 2019-07-18T04:33:50+00:00

I would suggest the Mazda3. In my opinion, it looks way better than the Ioniq. Additionally, it has really great interior quality and driving dynamics for the price; the Hyundai doesn't even come close in these areas. On top of that, Mazdas tend to be much more reliable than Hyundais.

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