## Search found 1268 matches

Tue Mar 21, 2023 12:08 pm
Forum: Chemistry forum
Topic: Chemistry the rate of reactions
Replies: 3
Views: 22

### Re: Chemistry the rate of reactions

In the exercise K 2.2* 10^-5 mol^¹* s^-1 and time 5 h is given.
Tue Mar 21, 2023 9:32 am
Forum: Chemistry forum
Topic: Chemistry the rate of reactions
Replies: 3
Views: 22

### Re: Chemistry the rate of reactions

Calculate the moles consumed = time × K

We have 1 mol NOBr - consumed moles = moles left
Mon Mar 20, 2023 10:07 pm
Forum: Chemistry forum
Topic: chemical balancing
Replies: 1
Views: 27

### Re: chemical balancing

1. 2 Na3PO4 + 3 Ba(NO3)2 => 2 Ba3(PO4)2 + 6 NaNO3

2. 2 H3AsO4 + 3 Pb(NO3)2 => 6 HNO3 + 2 Pb3(AsO4)2
Or
H3AsO4 + Pb(NO3)2 => 2 HNO3 + PbHAsO4
Mon Mar 20, 2023 1:58 pm
Forum: Chemistry forum
Topic: The rate of reactions
Replies: 4
Views: 30

### Re: The rate of reactions

It said A2 is reduced 2 times, not consummed. So it was taken out or removed. The same has to be done with B2.
The reaction is of course 1:1.
But if 0.02 mol A2 has reacted, then also 0,02 mol B2 has reacted and the new value is 0,03 mol.
Mon Mar 20, 2023 1:40 pm
Forum: Chemistry forum
Topic: The rate of reactions
Replies: 4
Views: 30

### Re: The rate of reactions

I think its not a consumption.
The concentration is reduced from 0,04 to 0,02
The reaction took place 0,04 with 0,05 means to keep the ratio it is 0,02 to 0,025. B is also reduced 2 times from 0,05 to 0,025.
Mon Mar 20, 2023 1:31 pm
Forum: Chemistry forum
Topic: Chemistry
Replies: 3
Views: 22

### Re: Chemistry

Yes I would think so
Mon Mar 20, 2023 1:04 pm
Forum: Chemistry forum
Topic: Chemistry
Replies: 3
Views: 22

### Re: Chemistry

K = cPCl5/(cPCl3*cCl2)

4 = x/((3-x)*(2-x)) solve for x.

The other reaction is
If 1,5 mol/ l Cl2 is left then 0,5 mol/l has reacted. What means the same amount of PCl3 has reacted and also the same amount PCl5 was obtained.

K= 0,5/((3-0,5)*(2-0,5))
Mon Mar 20, 2023 10:23 am
Forum: Chemistry forum
Topic: Chemistry the rate of reactions
Replies: 4
Views: 23

### Re: Chemistry the rate of reactions

The 3.2 is removed from 7.2 to get final 4.
Mon Mar 20, 2023 9:03 am
Forum: Chemistry forum
Topic: Chemistry the rate of reactions
Replies: 4
Views: 23

### Re: Chemistry the rate of reactions

2D + G => 2C + B In equilibrium we have 4 mol/l D , 2 mol/l G and 3,2 mol/l C In beginning there is no C and no B. So it means 3,2 mol C are produced, what means 2 D gives 2 C. 3,2 mol C has to be add to D what gives 7,2 mol/l . 3,2 mol C means also the half of G = 1,6 mol/l has to be used. So in be...
Thu Mar 16, 2023 7:02 am
Forum: Chemistry forum
Topic: NaOH
Replies: 3
Views: 59

### Re: NaOH

It is alcaline, because the OH group in NaOH is bonded to a metal. If OH group is bonded to a nonmetal like C, N, S, P, Cl and others it is working neutral to acidic, depending on the electronegativity.
More alcaline is C2H5O- in C2H5ONa.
Thu Mar 16, 2023 6:24 am
Forum: Chemistry forum
Topic: NaOH
Replies: 3
Views: 59

### Re: NaOH

It is because of the OH- group. NaOH, KOH, Ca(OH)2, Ba(OH)2 and others have same behaviour.
The OH- group can react with H+ ( H3O+) to form H2O. It is a proton acceptor (Brönstedt) or a electron pair donator ( Lewis).
Tue Mar 14, 2023 2:13 pm
Forum: Chemistry forum
Topic: Solubility of crystal hydrates
Replies: 4
Views: 72

### Re: Solubility of crystal hydrates

Tue Mar 14, 2023 9:37 am
Forum: Chemistry forum
Topic: Solubility of crystal hydrates
Replies: 4
Views: 72

### Re: Solubility of crystal hydrates

Separate the Masses of CuSO4 and Water. With the specific gravity of the 80 ml solution you get the mass of it with percentage the mass of CuSO4. Calculate the mass of CuSO4 from the 30 g CuSO4×5 H2O and also the mass of the 5 H2O. So you will get two sum, one of the both CuSO4 amounts and the water...
Tue Mar 07, 2023 2:24 pm
Forum: Chemistry forum
Topic: Predicting whether a reaction will occur using standard electrode potentials
Replies: 3
Views: 87

### Re: Predicting whether a reaction will occur using standard electrode potentials

Disaggree The solution is NiSO4. In this Chlorine Cl2 will be inserted. We have Ni 2+, SO4 2- and Cl2. There is no reaction Ni => Ni 2+ + 2e- Cl2 + 2e => 2Cl Ni 2+ + 2e => Ni This would be both reduction, no oxidation You cannot add both, because you need an Oxidation Ni => Ni 2+ + 2e- Cl2 + Ni => 2...
Tue Mar 07, 2023 2:46 am
Forum: Chemistry forum
Topic: Predicting whether a reaction will occur using standard electrode potentials
Replies: 3
Views: 87

### Re: Predicting whether a reaction will occur using standard electrode potentials

Its not clear do you have Ni metal available or not. If yes Ni is immersed into the NiSO4 solution. Chlorine is an oxidiser and will react with the Ni to form NiCl2. If only Ni 2+ is available then it could react from Ni 2+ to Ni 3+.