Question

@Cuanchi

Answer 1

ok

Answer 2

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:

Answer 3

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?

Answer 4

i dont get the question your asking.

Answer 5

I know what they are

Answer 6

But are you asking me to tell you

Answer 7

do you know the difference between chemical and physical change?

Answer 8

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.

Answer 9

chemical change in matter or substances.

Answer 10

physical change in a substance doesn't change what the substance is

Answer 11

good!!

Answer 12

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

Answer 13

N2 + 3H2 → 2NH3
Does it involve elements, compounds, mixtures, or pure substances?

Answer 14

Lol Awsome Fact @Photon336

Answer 15

Nitrogen is an element

Answer 16

@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.

Answer 17

@Photon336 it is a very good coach too if you ever need help in Chemistry @PrincestonA

Answer 18

Hydrogen is element

Answer 19

you're in good hands with @cuanchi

Answer 20

ok, what about the others?

Answer 21

2NH3 is a mixture

Answer 22

I think:(

Answer 23

no really

Answer 24

?

Answer 25

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)

Answer 26

Ohhhhhhhh

Answer 27

do you have any mixtures, or pure substances in the reaction?

Answer 28

So its a physical change because its not changing what the substance is

Answer 29

And I know N2 and 3H2 Are elements

Answer 30

2NH3 is a compound

Answer 31

it is a chemical reaction!!!!
the N2 and H2 are elements and the NH3 is a compound. All of them are pure substances.

Answer 32

I swear i thought it was a chemical reaction but i thought it would be trick question

Answer 33

how many atoms are involved before and after?

Answer 34

Ok can you remind me which one is the atoms and molecules, is it the one before the element or after

Answer 35

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

Answer 36

I got to go see you later!!

Answer 37

Okay Bye!!! See you later

Answer 38

Thanks soo much

Answer 39

Im kinda still confused a little to the final answer. @Photon336 can you help me where the great @Cuanchi left off pleasee.

Answer 40

first thing i'm going to ask you is what are you confused about @PrincestonA

Answer 41

About describing how many atoms are involved before and after, I know Cuanchi answered but I still don't quite get it

Answer 42

@Photon336

Answer 43

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

Answer 44

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

Answer 45

I WANT you to LOOK at this reaction and tell me what you see

Answer 46

@PrincestonA ?

Answer 47

Sorry im back Ok let me take a lot

Answer 48

ok

Answer 49

Yea I still dont get it

Answer 50

but what part of it do you not understand?

Answer 51

How did you get the 2AB3

Answer 52

@PrincestonA that's another example, to show you how to approach the problem

Answer 53

The 3 part

Answer 54

it's not the question that you were asked but I wanted to give you another example.

Answer 55

I know but how did you get the 3

Answer 56

@Photon336 can you explain the eqaution a little bit more

Answer 57

\[2A + 6B --> 2AB_{3} \]

Let's look at the reactants please tell me how many atoms of A and B we have in the reactants?

Answer 58

2

Answer 59

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?

Answer 60

6 is in front of B?

Answer 61

exactly

Answer 62

Now If we have 2 molecules of A, and 6 molecules of B in the reactants

Answer 63

We MUST ALWAYS have the same amount of molecules on the product side.

Answer 64

Now tell me how many molecules of A and B are on the product side?

Answer 65

the product side is the front right?

Answer 66

yes \[Reactants --> products \]

so on the right side of the arrow are the products

Answer 67

ooohhhhhhhhh

Answer 68

yes. so now tell me how many molecules of A and B are on the product side and WHY?

Answer 69

so there is 8

Answer 70

@PrincestonA you are correct there are 8 atoms total on the product side.

can you show me why though?

Answer 71

because there is2 atoms of N
and 6 atoms of H

Answer 72

and you add them

Answer 73

@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?