Fractions

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KSong_1J
Posts: 101
Joined: Thu Jul 11, 2019 12:17 am

Fractions

Postby KSong_1J » Sun Oct 06, 2019 9:10 pm

I know this was kind of addressed in a question someone asked earlier but I just wanted to ask if we would be marked down if we left the stoichiometric coefficient as a fraction? I know different professors prefer different things so I just wanted to clarify to see if it would necessarily be seen as a mistake if we left the fraction instead of multiplying both sides to get rid of it?

Sean1F
Posts: 19
Joined: Sat Sep 07, 2019 12:16 am

Re: Fractions

Postby Sean1F » Sun Oct 06, 2019 9:13 pm

I'm guessing it's always best to make the fraction into an integer. I've heard that that is the way it's done in the scientific field and that it is preferred by many since it is more user friendly for future calculations.

Anna Heckler 2C
Posts: 102
Joined: Wed Sep 18, 2019 12:18 am

Re: Fractions

Postby Anna Heckler 2C » Sun Oct 06, 2019 9:41 pm

In past chemistry classes, we have converted the fraction to a decimal and rounded to the correct number of sig figs. I assume Lavelle will prefer we do this since that is typically how figures are reported on lab reports and other experimental documents.

AveryAgosto
Posts: 76
Joined: Wed Sep 18, 2019 12:16 am

Re: Fractions

Postby AveryAgosto » Sun Oct 06, 2019 11:07 pm

I would assume changing the fraction to an integer is the only way you would get full credit. The purpose of making a fraction is so that it's easy to convert all of the elements coefficients to whole numbers.

Ethan Lam 4A
Posts: 69
Joined: Thu Jul 11, 2019 12:17 am

Re: Fractions

Postby Ethan Lam 4A » Mon Oct 07, 2019 11:42 pm

They might give you partial credit though even if you leave it in fractions as long as you show your work.

Sam McNeill 1E
Posts: 110
Joined: Sat Aug 24, 2019 12:17 am

Re: Fractions

Postby Sam McNeill 1E » Tue Oct 08, 2019 12:13 pm

I would change the fraction to an integer since the equation is supposed to represent the exact reaction with the smallest whole integers, not a fraction of it.

TimVintsDis4L
Posts: 104
Joined: Sat Aug 17, 2019 12:17 am

Re: Fractions

Postby TimVintsDis4L » Tue Oct 08, 2019 12:33 pm

I would personally refrain from keeping fractions in the formula because of how easy of a fix it is. All you really have to do is multiply everything by the denominator to remove the fraction. It's an easy fix for something you won't have to worry about later.

Victoria Otuya 4F
Posts: 50
Joined: Wed Sep 18, 2019 12:21 am

Re: Fractions

Postby Victoria Otuya 4F » Wed Oct 09, 2019 1:01 am

Dr.Lavelle states it's better that the fractions are left in whole numbers when balancing equations. Since he prefers it that way, I think it is better to keep the habit of doing it often when it comes down to fractions in a chemical equation.

TarynD_1I
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

Re: Fractions

Postby TarynD_1I » Wed Oct 09, 2019 2:52 pm

You should multiply all coefficients to make them whole integers, especially if the question is asking for a molecular or empirical formula.

Matthew Tsai 2H
Posts: 101
Joined: Wed Sep 18, 2019 12:20 am

Re: Fractions

Postby Matthew Tsai 2H » Wed Oct 09, 2019 6:24 pm

It's generally good practice to convert all the coefficients to integers, as that gives the most accurate representation of the chemical reaction.

Arvind 4G
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Been upvoted: 1 time

Re: Fractions

Postby Arvind 4G » Thu Oct 10, 2019 10:56 am

I would convert all fractions into an integer but using fractions is a good way to keep the numbers straight and helps initially with balancing.

Ashley Kumar 3F
Posts: 50
Joined: Sat Sep 07, 2019 12:18 am

Re: Fractions

Postby Ashley Kumar 3F » Thu Oct 10, 2019 11:44 am

I would say convert it to an integer

Audrie Chan-3B
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

Re: Fractions

Postby Audrie Chan-3B » Thu Oct 10, 2019 12:36 pm

I think it's best to just multiply it so that it becomes a whole integer.

Juana Abana 1G
Posts: 100
Joined: Wed Sep 18, 2019 12:15 am

Re: Fractions

Postby Juana Abana 1G » Fri Oct 11, 2019 8:46 am

I think it would be better to multiply the faction in order to get an integer.

PriscillaLi_3G
Posts: 63
Joined: Fri Sep 27, 2019 12:30 am

Re: Fractions

Postby PriscillaLi_3G » Fri Oct 11, 2019 11:30 am

Don't leave the coefficients as fractions.

BSolano_3A
Posts: 7
Joined: Tue Nov 13, 2018 12:18 am

Re: Fractions

Postby BSolano_3A » Fri Oct 11, 2019 12:12 pm

The coefficients should always be whole numbers even at their empirical formula notation. Just make them whole numbers, if anything at least at that point you would have gotten your molecular formula. Hope this helps.

Charysa Santos 4G
Posts: 107
Joined: Wed Sep 18, 2019 12:21 am

Re: Fractions

Postby Charysa Santos 4G » Fri Oct 11, 2019 1:08 pm

I remember Prof. Lavelle suggesting that we should convert the fractional stoichiometric coefficients into whole integers.

ThomasNguyen_Dis1H
Posts: 102
Joined: Fri Aug 30, 2019 12:17 am

Re: Fractions

Postby ThomasNguyen_Dis1H » Fri Oct 11, 2019 1:12 pm

It should always be expressed as a whole number. However, during the thermodynamics units, it would be beneficial to leave it as a fraction, but for now just express them as whole numbers.

annikaying
Posts: 94
Joined: Sat Sep 14, 2019 12:16 am

Re: Fractions

Postby annikaying » Wed Nov 13, 2019 5:14 pm

I would convert it to an integer as the TAs always change it and they are the ones that grade the tests and homework.

705198479
Posts: 55
Joined: Wed Sep 18, 2019 12:20 am

Re: Fractions

Postby 705198479 » Wed Nov 13, 2019 5:24 pm

I would always change it to an integer because it gives an accurate answer

RBergtraun_3A
Posts: 41
Joined: Wed Feb 20, 2019 12:15 am

Re: Fractions

Postby RBergtraun_3A » Sun Nov 17, 2019 10:38 pm

its useful to use fractions in the process of figuring it out then multiplying the whole equation (both sides) by a least common denominator.


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