What is the difference between adding a subscript 2 to the end of the formula?
A subscript, such as in CO2, says that you have one carbon atom and two oxygen atoms in that formula unit of carbon dioxide. (or moles, if you'd prefer). Subscripts will apply only to the element to their immediate left unless parenthesis tell you to apply the subscript to the whole unit. A coefficient such as in 2CO says you have two formula units of carbon monoxide, as in one carbon and one oxygen atom. The 2, as a coefficient, will apply to both the carbon and the oxygen. The law of conservation of mass says that matter cannot be created or destroyed in ordinary chemical reactions. So, really what they're asking here is have you lost anything? To do this, you just have to check if you have the same number of atoms (or moles if you prefer the term) of each substance on each side. We have 3 Mg on the left hand side (that is to the left of the arrow), and we have three to the right hand side. We have two PO4's on the left and 2 PO4's on the right hand side. We have a total of 6 O from the hydroxides in Mg(OH)2, and a total of 6 O from the H2O on the right hand side. In addition, we have 12 H on the left (6 from the Mg(OH)2 and 6 from the phosphoric acid [2H3PO4(aq)]... and 12 H from the water on the right side. So, yes, this is consistent with the law of conservation of mass.
How do we add Super and Subscripts in Google Sheets?
Use Unicode symbols.I’ve set them up to type natively on my iPhone, iPad and Mac using text shortcuts. For instance I type “^2” to get ² and “,2” to get ₂. Google Sheets accepts these Unicode characters.You can Google “superscript 2 Unicode” etc and you should get a hit then copy paste them into your sheet. Alternatively I did write about typing math and scientific symbols natively on iOS and in that blog post I included a link to a bunch of symbols you can copy without having to search each one: Type scientific and math symbols on your iOS device with easeHowever you choose to investigate this method I hope it helps you.
What is the difference between a subscript and the number in front of an element[coefficient]?
Subscripts specify the mole ratio of elements in a particular substance. Also. Subscripts specify the number of atoms of each element in a molecule (or formula unit) of a particular substance. Change a subscript and you change the substance. A frame + four wheels = car (FW4) A frame and three wheels = tricycle (FW3). The coefficients change the amount of substance. 5FW4 = 5 cars. 6FW3 = 6 tricycles. To count individual parts multiply the coefficient times the subscript. 5FW4 will have 5 frames and 20 wheels.
What would be the subscripts for the formula unit Ca_O_?
CaO So 1 ,1
What is the molar entropy of fusion (delta)Sf (f in subscript) for lead (Pb) in Joules ?
Entropy is measured in units of joules/(degree K), and the *molar* entropy is measured in units of joules/((degree K)*mole), not just joules. *I* would get the molar entropy for the fusion of lead by going to the NIST on-line database of thermodynamic properties at the first source below, and look up the melting point of Pb (second source below). Doing this, I find that Pb melts at a temperature between 600 K and 601 K . I would then look up the molar entropies of solid Pb and liquid Pb at ~601K at the third and fourth sources below. Doing this, I find that: S_solid(600 K) = 84.34 J/(K*mol) S_liquid(601K) = 92.33 J/(K*mol) The molar entropy of fusion is simply given by: delta-S_fusion = S_liquid - S_solid = 7.99 J/(K*mol) If this is some sort of homework problem, though, I suspect that you were given a set of thermodynamic data for a series of reactions, and that by adding and subtracting some combination of those reactions, you can obtain the net reaction: Pb(solid) = Pb(liquid) at the melting temperature of Pb. The molar entropy of this reaction is then given by the same combination of sums and differences of the reaction entropies as you performed to get the net reaction above.
The molar mass of CCl (subscript) 4 is 153.g/mol. How many grams of CCL4 are needed to have 5.000 mol?
let me start by solving the problem and then adding some explanations.. 5.000mol x (153. g / mol) = 765g... 3 sig figs. ******** notice that mol x (g/mol) ---> g? Because mol/mol cancels out? That is "factor label method" and you need to learn that method. It's very important. notice the 3 sig figs? this is another important topic. 5.000 has 4 sig figs, 153. has 3 sig figs.. so your answer can have 3 sig figs. notice the 153 g/mole.. that is the molar mass and we get from a periodic table. we sum up the atomic weights of the atoms and convert that to grams per mole. *********** CCl4.. 1C.. 4Cl's.. and from a periodic table... atomic weight C = 12 atomic weight Cl = 35.5 so.. atomic weight ClCl4 = 1x12 + 4x35.5 = 153.. and the units of that are 153 amu's / atom = 153 grams/ mole of atoms. *********** now I suggest you read my answer in the following links were I explain what a mole is and "factor label method" http://answers.yahoo.com/question/index;... http://answers.yahoo.com/question/index;... ********** yes.. I know that's a lot. But you get these three topics down and you'll do well. Do you have any questions about any of this? ********** Norrie.. Everyone here received 2 thumbs down, except Trevor H, didn't they? Who knows why people give thumbs down? Some folks just like clicking the button. Some give poor answers thumbs down. Some give thumbs down to "level the playing field". Some do it for retaliation. YOU are in the latter two groups. As to the methods taught in chemistry classes today. Why would I care if you like the them or not? You don't like sig figs? Too bad. You don't like dimensional analysis? Soo sad. You prefer a slide rule over a calculator? Who cares? Not me. My recommendation? If you don't like receiving F's, don't enroll in a chemistry class.
How do I create a superscript dimension in AutoCAD?
To be able to do this, you would already be required to have given the dimension to which you want to add a superscript or a subscript.Select command DDEDIT and press enter.Select the dimension or annotation you want to edit.Add the text you want to be superscripted. Add a ‘^’ symbol to the text.Highlight the added text(along with the ^ symbol) and right click.Select stack.Right click again and select stack properties. If you want a superscript, choose upper case. If you want a subscript, choose lower case.
What is an array in the C programming language?
Array is a linear data structure. It is a collection of similar data items which may be integer, float etc… or any user defined type such as structure. Elements are stored in consecutive memory locations. Elements referred by the common name, i.e. Array name.E.g. int a[5]Here,a is the array which can hold upto 5 values of type integer and Index locations are 0 to 4.Ifint a[5]= { 1,2,3,4,5} Then a[0]= 1, a[1]=2, a[2]=3, a[3]=4, a[4] =5There are mainly 2 types of array.One - dimensional Array:It is defined by specifying its name, size, data types of the itemsSyntax:DataType ArrayName[size] ;E.g.float number [10];2. Multi dimensional Array:They are defined in number of square brackets are more in multi dimensional Array. There will be two pairs of square brackets for 2-dimensional Array, three pair for 3- dimensional Array and so on…Syntax:DataType ArrayName [m1][m2]...[mn];Where m1,m2…mn are the dimensions of the array.E.g. For two dimensions array,int array[3][4];int array [3][4] can contains 3*4 = 12 elements.Ifint array [3][2]={ 1,2,3,4,5,6}; int i,j;Thenarray[0][0]=1array[0][1]=2array[1][0]=3 , so on..Diagrammatic:| 1 2 || 3 4 || 5 6 |Best Reference Book: Programming in ANSI C, by E. BalagurusamyHope you understood :)Thank you!!!
Molarity Question...?
Molarity is equal to moles of solute divided by liters of solution. In this case luminol is your solute and water is your solution. Luminol (C8H7N3O2) has a molecular weight of 177.16 g/mol. With 14 grams, you would have .0790 mol of luminol (14 grams X 1 mol / 177.16g = .0790 mol, the grams cancel each other out). Divide that by 75.0 mL and you will have the wrong answer, because the definition of molarity is moles of solute per LITERS of solution not MILLILITERS, so you have to change 75.0 mL to L, which would be .075L. So .0790/.075 gives you a molarity of 1.05 (with the correct number of sig figs). I hope this helps! Chemistry it a *****!