All Questions
Tagged with notation terminology
11
questions
6
votes
1
answer
273
views
Is there a canonical variable for period and group?
For example, "Z" is the standard symbol for atomic number. I'm writing a manuscript that uses the group and period of elements within some equations, and so far I'm just denoting them as $G_{...
0
votes
1
answer
355
views
How to distinguish mass concentration and density?
I am writing a proof where I have to mention both with density and of a material and mass concentration (mass/volume) of a material.
I am using the letter $\rho$ to represent density, and I didn't ...
- 129
5
votes
0
answers
72
views
Is there a particular name for a Hill formula or sum formula omitting hydrogen?
Often, single-crystal X-ray diffraction analysis determines the non-H atoms first, and eventually puts hydrogen atoms "as riding" on idealized positions in respect to heavier atoms (e.g., C, O, N), ...
- 30.4k
0
votes
2
answers
214
views
Atomic mass number and mass number in atomic symbol
In chemistry classes or even many different branches of chemistry textbooks, I am told that the atomic symbol
$$\Large ^A_Z\ce{X}$$
includes the following notations:
$A$ – "atomic mass" or "mass ...
- 383
10
votes
2
answers
2k
views
Is “amount of substance” the same thing as “number of moles”?
Background:
Amount of substance is a fundamental physical quantity which has mole (mol) as it's SI unit. Therefore all expressions for amount of substance should have the unit mole on simplification.
...
- 109
6
votes
1
answer
161
views
How to calculate molar mass of (6)UO2+2D and (6)UO2OH+D?
For a hydrogeochemistry project, I want to calculate the molar masses of some compounds. I came across a problem when encountering species like (6)UO2+2D (aq) and <...
- 173
4
votes
1
answer
3k
views
What does 10 Vols mean?
I am currently working on a project and the protocol says the following, "Wash resin 3 times 10 vols of the extract buffer." This is very confusing to me and I am not exactly sure what the 10 vols ...
- 141
2
votes
2
answers
2k
views
Rounding of atomic weight isotopes
When we look at atomic mass, for example, $\ce{^134Ba}$ (barium) has a mass of $133.90 \,\mathrm{Da}$. Why is this rounded to $134 \,\mathrm{Da}$? This is shown in my book.
- 435
2
votes
1
answer
765
views
Molar heat capacity and heat capacity
Is molar heat capacity and heat capacity
at constant volume both represented by $C_v$?
at constant pressure both represented by $C_p$?
- 863
2
votes
1
answer
385
views
Which ions are accounted for in total and net ionic equations?
There are a number of things I don't understand about ionic equations.
First off, when you do net ionic equations, is it correct that you're only focusing on precipitates? The way I understood it, ...
- 175
1
vote
2
answers
401
views
Significant Figures in almost-scientific notation
For a homework assignment on significant digits, I have to find the number of significant digits in the number $0.40 \times 10^3$. I know that in scientific notation, the number of significant digits ...
- 151