Mass of atoms

Moderators: Chem_Mod, Chem_Admin

Katie Nye 3I
Posts: 35
Joined: Wed Sep 30, 2020 9:55 pm

Mass of atoms

Postby Katie Nye 3I » Sun Oct 25, 2020 12:15 pm

When it comes to certain questions, we need the mass of electrons or certain atoms in order to solve it. Does that always need to be in kilograms? And will we be given the value or do we need to memorize the basic ones?

Jay Solanki 3E
Posts: 56
Joined: Wed Sep 30, 2020 9:59 pm
Been upvoted: 1 time

Re: Mass of atoms

Postby Jay Solanki 3E » Sun Oct 25, 2020 12:18 pm

Hello!

Masses should always be in kilograms since we use them in the context of Joules (which is kg m^2/s^2). This way the units cancel. As for your second question, we do not need to memorize any masses as they are given to us on the equations and constants sheet. Hope this helps!

Catie Donohue 3I
Posts: 36
Joined: Wed Sep 30, 2020 9:55 pm

Re: Mass of atoms

Postby Catie Donohue 3I » Sun Oct 25, 2020 12:50 pm

Hi! Adding on to the previous response, I would say that it's a good idea to use your SI units when you're unsure or when there are no units specified in the question (kg, m, s). If they use specific units in the question itself, I would change your units back to the same type the question uses unless it explicitly asks you to change the unit in your answer.

Justin Lin 3B
Posts: 36
Joined: Wed Sep 30, 2020 9:50 pm

Re: Mass of atoms

Postby Justin Lin 3B » Sun Oct 25, 2020 12:57 pm

You should always make sure that the mass is converted to kilograms because you'll be able to work with the SI units. Some of the conversions are on the constant sheet we were given, but there are other conversions not on the sheet that we should memorize.

Halle Villalobos 3C
Posts: 35
Joined: Wed Sep 30, 2020 9:52 pm

Re: Mass of atoms

Postby Halle Villalobos 3C » Sun Oct 25, 2020 1:44 pm

Hi! We will be allowed a periodic table and formula sheet while taking the midterm. The formula sheet includes the mass of electrons, protons, and neutrons. As for masses of certain elements, remember that 1kg = 10^3 g as we should always convert to kg in our calculations. I hope this helps!

Keshav Patel 14A 3B
Posts: 36
Joined: Wed Sep 30, 2020 9:40 pm

Re: Mass of atoms

Postby Keshav Patel 14A 3B » Sun Oct 25, 2020 2:48 pm

Mass of atoms should always be in Kilograms. When it comes to electrons, neutrons and protons all are on the formula sheet, so you will know the masses of all the following. So undoubtedly you will not get the mass of any of these particles in anything but kilograms.

Brandon McClelland 2K
Posts: 36
Joined: Wed Sep 30, 2020 9:31 pm

Re: Mass of atoms

Postby Brandon McClelland 2K » Sun Oct 25, 2020 3:14 pm

If no units are specified, I'd just stick to kilos because they're the SI unit.

Jason Knight - 1D
Posts: 38
Joined: Wed Sep 30, 2020 9:55 pm

Re: Mass of atoms

Postby Jason Knight - 1D » Sun Oct 25, 2020 3:25 pm

It is given we do not need to memorize certain masses for the exam, because they are provided on the calculation sheet that Dr. Lavelle sent out. When problem-solving, convert to kg because that is the SI unit of mass.

Brian Nguyen 2F
Posts: 35
Joined: Wed Sep 30, 2020 9:49 pm

Re: Mass of atoms

Postby Brian Nguyen 2F » Sun Oct 25, 2020 4:02 pm

Kilograms is the SI Unit for mass, so you will have to keep in mind that when solving, your mass is converted in kilograms in order to get the right calculation.

josephspindler2L
Posts: 37
Joined: Wed Sep 30, 2020 9:54 pm

Re: Mass of atoms

Postby josephspindler2L » Sun Oct 25, 2020 4:37 pm

As some such as Halle have already stated, the equations and constants sheets will have the mass of protons, electrons, and neutrons provided. We'll be using kg as the unit of choice as other constants/equations will be dependent on this unit.

Jeremy Wei 2K
Posts: 31
Joined: Wed Sep 30, 2020 9:59 pm

Re: Mass of atoms

Postby Jeremy Wei 2K » Sun Oct 25, 2020 6:06 pm

Hi, when using mass of electrons or protons or whatever you’d be using the standard SI units in the problem so yes, you’ll be using kg. Also Lavelle sent out a constants sheet with all the masses that you’ll be able to use on the exam so no need to memorize them!

Jasraj Parmar 3H
Posts: 54
Joined: Wed Sep 30, 2020 9:44 pm

Re: Mass of atoms

Postby Jasraj Parmar 3H » Sun Oct 25, 2020 6:11 pm

You use standard SI units, So I would just stick to kg for the mass.

Rohit Srinivas 1C
Posts: 36
Joined: Wed Sep 30, 2020 9:52 pm

Re: Mass of atoms

Postby Rohit Srinivas 1C » Sun Oct 25, 2020 6:16 pm

On one of the textbook problems it assumed we knew how to convert from miles to meters. Is that something we need to memorize?

Kyle Dizon 1A
Posts: 46
Joined: Mon Oct 05, 2020 12:16 am

Re: Mass of atoms

Postby Kyle Dizon 1A » Sun Oct 25, 2020 9:10 pm

I would stick with the SI units just in case because it is easier to work with the SI units.

Simran Bains 2I
Posts: 34
Joined: Wed Sep 30, 2020 9:36 pm

Re: Mass of atoms

Postby Simran Bains 2I » Sun Oct 25, 2020 9:21 pm

If we are doing something that involves joules then we should use kilograms and we don't have to memorize any of the masses as they will be provided to us.

Jack Kettering 2H
Posts: 35
Joined: Wed Sep 30, 2020 9:42 pm

Re: Mass of atoms

Postby Jack Kettering 2H » Sun Oct 25, 2020 9:23 pm

Masses should always be in SI units which in the case of mass is kilograms. As for your second question, I believe all constants like that will be given to us during exams so no need for memorization.

Joshua Chung 2D
Posts: 39
Joined: Wed Sep 30, 2020 9:32 pm

Re: Mass of atoms

Postby Joshua Chung 2D » Sun Oct 25, 2020 10:17 pm

Other people have pretty much covered it, but just make sure that your SI units align in your equations, and when in doubt double check the conversions.

Armen_Isayan_3F
Posts: 42
Joined: Wed Sep 30, 2020 10:09 pm

Re: Mass of atoms

Postby Armen_Isayan_3F » Sun Oct 25, 2020 11:01 pm

Hello Katie, the mass of the atoms should be presented in kilograms because it is the SI unit for mass. Unless, an actual unit is specified it is best to utilize kilograms as the unit for the mass.

Muskaan Abdul-Sattar
Posts: 26
Joined: Wed Nov 13, 2019 12:19 am

Re: Mass of atoms

Postby Muskaan Abdul-Sattar » Mon Oct 26, 2020 11:11 pm

The mass of the atoms should be in kilograms because it is the SI unit for mass.


Return to “Photoelectric Effect”

Who is online

Users browsing this forum: No registered users and 3 guests