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1. In 1912, chemist Fritz Haber developed a process that combined nitrogen from the air with hydrogen at high temperatures and pressures to make ammonia. Specifically, the process involved combining one molecule of nitrogen gas (N2) with three molecules of hydrogen gas (H2) to get two molecules of ammonia (NH3). If you write this process in a symbol format, it looks like this: N2 + 3H2 → 2NH3 Explain whether this is a chemical or physical change, and why. Does it involve elements, compounds, mixtures, or pure substances? Also describe how many atoms are involved before and after. What do you notice about the number of atoms? Answer:
OK What do you think is a chemical (change in the nature of the substance) or a physical (the substance still the same before and after the reaction?

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i dont get the question your asking.
I know what they are
But are you asking me to tell you
do you know the difference between chemical and physical change?
What you probably aren't familiar with is that Fritz Haber, probably one of the most famous/infamous chemists of all time also developed mustard gas, which was widely used in WWI by the german army, as a chemical weapon.
chemical change in matter or substances.
physical change in a substance doesn't change what the substance is
good!!
this is unrelated though but I find it fascinating. Think about what's happening in the reaction, are new compounds being formed and what's happening @PrincestonA
N2 + 3H2 → 2NH3 Does it involve elements, compounds, mixtures, or pure substances?
Lol Awsome Fact @Photon336
Nitrogen is an element
@PrincestonA Arguably fritz haber is also considered a war criminal but because he invented the process to synthesize ammonia, he won the nobel prize for it.
@Photon336 it is a very good coach too if you ever need help in Chemistry @PrincestonA
Hydrogen is element
you're in good hands with @cuanchi
ok, what about the others?
2NH3 is a mixture
I think:(
no really
?
the proportion of N and H in the NH3 are always constant it is a compound (like H2O is not a mixture of H and O)
Ohhhhhhhh
do you have any mixtures, or pure substances in the reaction?
So its a physical change because its not changing what the substance is
And I know N2 and 3H2 Are elements
2NH3 is a compound
it is a chemical reaction!!!! the N2 and H2 are elements and the NH3 is a compound. All of them are pure substances.
I swear i thought it was a chemical reaction but i thought it would be trick question
how many atoms are involved before and after?
Ok can you remind me which one is the atoms and molecules, is it the one before the element or after
in the case of the N2 you have two atoms, in the case of the H2 you have two atoms too, but you need 3H2 then you have a total 6 atoms in the 3H2 you multiply the number in front of the symbol by the number under the symbol 8 and 8 are the same number of atoms before and after the reaction N2 + 3H2 → 2NH3 2 atoms of N and 6 atoms of H
I got to go see you later!!
Okay Bye!!! See you later
Thanks soo much
Im kinda still confused a little to the final answer. @Photon336 can you help me where the great @Cuanchi left off pleasee.
first thing i'm going to ask you is what are you confused about @PrincestonA
About describing how many atoms are involved before and after, I know Cuanchi answered but I still don't quite get it
well, do you know that in every chemical reaction: if we start out with a certain number of atoms, we must end off with that same number does this make sense? @PrincestonA
let's say I have this reaction @princestonA i need you to follow along each step of the way, so i need you to participate. \[2A + 6B --> 2AB_{3}\] <-- we will work with that reaction In every chemical reaction, the number of atoms of reactants must equal the number of atoms of products. Does this make sense
I WANT you to LOOK at this reaction and tell me what you see
Sorry im back Ok let me take a lot
ok
Yea I still dont get it
but what part of it do you not understand?
How did you get the 2AB3
@PrincestonA that's another example, to show you how to approach the problem
The 3 part
it's not the question that you were asked but I wanted to give you another example.
I know but how did you get the 3
@Photon336 can you explain the eqaution a little bit more
\[2A + 6B --> 2AB_{3} \] Let's look at the reactants please tell me how many atoms of A and B we have in the reactants?
2
Yes we have two reactants A and B. see those numbers in front of them? well because there is a 2 in front of A, we have 2 molecules of A how many molecules of B do we have in the reactants?
6 is in front of B?
exactly
Now If we have 2 molecules of A, and 6 molecules of B in the reactants
We MUST ALWAYS have the same amount of molecules on the product side.
Now tell me how many molecules of A and B are on the product side?
the product side is the front right?
yes \[Reactants --> products \] so on the right side of the arrow are the products
ooohhhhhhhhh
yes. so now tell me how many molecules of A and B are on the product side and WHY?
so there is 8
@PrincestonA you are correct there are 8 atoms total on the product side. can you show me why though?
because there is2 atoms of N and 6 atoms of H
and you add them
@PrincestonA in my example I used A and B there are 2 atoms of A and 6 atoms of B. yes. look at this does this make sense? |dw:1442611946494:dw|
in total on the right side we have 6 atoms of B and 2 atoms of A
ok i see
I'll give you another one
|dw:1442612178445:dw|
Tell me how many atoms of A and how many atoms of B are on the reactants side; then do the same for the product side.
6 on the reactants side and
4
I'm probably wrong. cause i honestly cannot think because im having a anaixty attack. I have been working working this for 5 hours, since 12:00 and im shaking
Good for the reactant side you got it. but To make things a little easier answer these questions: 1. How many for A on the reactants side 2. How many atoms for B on the reactant side 3. How many atoms for A on the product side 4. How many atoms for B on the product side
you will get this because you got it already for the other problem
1. How many for A on the reactants side? 4 2. How many atoms for B on the reactant side2 3. How many atoms for A on the product side ? Idk 4. How many atoms for B on the product side ? Idk
Sorry im back now
With my orginal questions it also ask What do you notice about the number of atoms? @Photon336
@PrincestonA you got it correct for the first part
Great job, now look at the product side, Ideally there should always be the same number of atoms of a, and the same number of atoms of B on the product side.
|dw:1442616788888:dw| This is the products for the reaction I wrote. Can you tell me how many atoms of A and B there are? remember what I said about how to figure this out?
i'm not leaving until you get it
Ok Sorry i was eating. But If it should be the same number then 1. How many for A on the reactants side? 4 2. How many atoms for B on the reactant side2 3. How many atoms for A on the product side ? 4 4. How many atoms for B on the product side ? 2
yes that's correct great job
This will be true for any chemical equation when I say ANY i mean it
Ohhhhhhh I thought it was harder than that. i need to stop overthinking
no it's not that hard trust me like for example |dw:1442618928467:dw|
Ohhh i get it now
So how would i answer these final questions correctly?
Explain whether this is a chemical or physical change, and why. Does it involve elements, compounds, mixtures, or pure substances? Also describe how many atoms are involved before and after. What do you notice about the number of atoms?
the same way we did it before
STEP 1. Count number of atom(s) on the reactant side for each element in the compound STEP 2. Count number of atom(s) on the product side for each element in the compound. the number of atoms should be the same on both sides.
FYI an element, are all on the periodic table of elements
A compound has more than one element
Its a chemical Change because its change in the nature of the substance. N2 and H2 are elements and the NH3 is a compound. All of them are pure substances. And there are 8 atoms before the reation and 8 after the reaction.
Whew!!! I think i answered it
Yes. that's correct. Just sometimes don't over think it too much. just look for what is being asked and go from there.
what do they mean by this
What do you notice about the number of atoms?
they are the same on both sides. you have 2 atoms of nitrogen and 6 atoms of hydrogen on both sides. you notice that on both sides you have 8 atoms on each side. @PrincestonA you answered your own question and you got it right.
THANK YOU SO MUCH BRO!!!! I know I was slow asf at first but all I needed to do was eat something. I was studying and doing chem homework for 5 hours and starved myself and i started to shake and couldn't think right
yeah no problem @PrincestonA great job, you got it now. like for every reaction you'll always have the same number of atoms on both sides for each element. always remember that, and make sure that you check too because sometimes the reaction isn't balanced.
Ok will do bro..:) And Thanks alot too @Cuanchi

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