IS this right?

10 months agoPyridoxine contains 11 hydrogen atoms, 8 carbon atoms, 3 oxygen atoms, and 1 nitrogen atom. What is the chemical formula for pyridoxine?

10 months agoyeah that's right

10 months agothe order is kind of dumb/arbitrary but I believe this would be PSBr3

10 months agoOh because Br has the r which makes it last ? :/

10 months agoI just looked it up and apparently groups 13-15 get priority over other nonmetals tbh I've never heard of this rule

10 months agoCalcium chloride contains only calcium and chlorine. What is the formula for this compound?

10 months agoCaCl?

10 months ago... well, according to the directions they gave you yes

10 months agoINcoreect :/ It says this would not be neutral?

10 months agooh I misread the directions >_> the charges are Ca2+ and Cl- so you'd need 2 chlorine atoms per 1 calcium atom

10 months agoCaCl2

10 months agoyeah

10 months agofor some reason I read it as 1 calcium atom and 1 chlorine atom

10 months agoCould you explain this to me ? :/

10 months ago*** hepta not septa ***

10 months agobut what about the H2O

10 months agoMgSO4 --> magnesium sulfate (the sulfate ion is the entire SO42-) ion 7H2O ---> heptahydrate

10 months agohydrate means water, so H2O --> ____ hydrate

10 months agooh okay

10 months agoDon't you add up the molar masses from the periodic table?

10 months agowhat did I do wrong

10 months agoI got confused by the 7h20 what do I do with the 7 when calculating the molar mass

10 months agoThe 7 applies to the whole water molecule (not the magnesium sulfate, just water) so you’d multiply the molar mass of water by 7

10 months agoso 126.112 for the water molecule

10 months ago246.5

10 months agoonly three sig figs, instead of rounding 246.466 to 246.5 you'd round down to 246

10 months agoOkay I got that part. How do I determine the percent composition of the hydrate

10 months agoWhat is the percent mass of magnesium sulfate in MgSO4⋅7H2O?

10 months ago(molar mass of just the MgSO4 / total molar mass of the whole compound) * 100

10 months agoto save some time, (120.37/246.466)*100

10 months ago*now that I look at the other problem they actually wanted 4 sig figs for the molar mass of magnesium sulfate heptahydrate whoops*

10 months agoI did 4 sig figs lol

10 months agoIf 28.0 g of MgSO4⋅7H2O is thoroughly heated, what mass of anhydrous magnesium sulfate will remain?

10 months agowhatever percent you got from before * 28

10 months agoOkay so do I subtract 28 from 126.112

10 months agohm, not quite, we calculated what percent of the whole compound is the magnesium sulfate part so you'd just multiply (120.37/246.466) * 28

10 months ago13.67

10 months agoyeah that's what i got too

10 months agoso if a certain number of grams is being heated or whatever and I want to calculate the remaining I would just multiply it?

10 months agoand would this be g/mol

10 months agosort of like, we calculated that MgSO4 makes up like 48% or whatever of the entire compound MgSO4 * 7H2O this proportion remains the same regardless of how much MgSO4 * 7H2O there is so in our example problem, there is 28.0g of MgSO4 * H2SO4 so 48% times 28.0 gives the amount of MgSO4, as desired

10 months agothis particular problem is asking for mass, so g, not g/mol

10 months agoEnter the formula for the compound formed between potassium and sulfur.

10 months agoK2S

10 months agoyeah that should be it

10 months agoHow many covalent bonds does carbon form if each of its unpaired electrons participate in one bond?

10 months agoCOuld you explain how I would do this problem

10 months agocarbon is group 4A ---> 4 unpaired electrons ---> "each unpaired electron gets 1 bond" --> 4 bonds

10 months agoso for oxygen it would be 6?

10 months agooh wait it would be 2?

10 months agohm, oxygen is a special case, it only gets 2

10 months agonitrogen= 5

10 months agois it basically imagining the lewis dot structure and imagining how many unpaired cases there would be

10 months agoso nitrogen is 1?

10 months agooh, now I remember since oxygen has 6 VElectrons it takes 2 extra for bonding, thereby making 2 bonds since nitrogen has 5 valence electrons it takes 3 for bonding, thereby making 3 bonds

10 months ago|dw:1539579970661:dw|

10 months agowould this relate to electron configuration

10 months agoi'm sorry im just trying to make connections because I just don't get it :/

10 months agooh by bonding you mean to make it a full shell which is 8?

10 months agoyeah

10 months agoso hydrogen would be 7

10 months agohydrogen is a special case, it doesn't follow the octet rule and only takes 1 bond

10 months agomy explanations might not be the greatest, I just know from memory what they're supposed to be

10 months agoNo don't worry about it . i just like to go even deeper just so i am fully grasping the concept.

10 months agoto be more specific hydrogen only has 1 electron normally, it doesn't fill up the second subshell which would have 8

10 months agohm, the three pairs in between are the bonding pairs and the two pairs on the outside are the lone pairs making C false between A and B I feel like both could work but I'm leaning towards A because it's a triple bond not three separate covalent bonds

10 months agolemme double check

10 months agooh b?

10 months agoyeah between a and b for me too :/

10 months agodouble checked with a friend and they say A as well

10 months agookay wasb wrong or was a just the best answer

10 months ago"three single covalent bonds" technically this is a triple bond, which is counted as one bond not three

10 months agojust need you to look this over if you could

10 months ago1) metal + nonmetal or metal + metal --> ionic nonmetal + nonmetal --> covalent

10 months ago2) you're on the right track just write out the ratio 2:3

10 months ago3) MnO4 gets a special name permanganate so KMnO4 ---> potassium permanganate

10 months agocovalent ionic covalent

10 months agofor 1

10 months agoyeah that's what i got too

10 months agoand then #4

10 months ago4a) I'm not 100% sure but diiodd is probably iodine not osmium I2O7?

10 months agoother ones look fine

10 months agocompound nitrogen monoxide?

10 months agoNO

10 months agoyup

10 months ago