Search found 1205 matches

by ChenBeier
Sat Dec 03, 2022 2:06 am
Forum: Chemistry forum
Topic: Balancing equation for theoretical yield
Replies: 1
Views: 34

Re: Balancing equation for theoretical yield

Acetonitril is only solvent. It will not react. Theoretical yield is normaly 100%.
Practical yield is ;

Let say you make of 5 g of a educt 10 g product that is equal 100%
But in the Experiment you dind only 8 g so the yield is 8g/10g * 100% = 80%
by ChenBeier
Thu Dec 01, 2022 8:47 am
Forum: Chemistry forum
Topic: Balancing Equations
Replies: 3
Views: 140

Re: Balancing Equations

Its correct, but the original Poster should answer it.
by ChenBeier
Wed Nov 30, 2022 1:21 am
Forum: Chemistry forum
Topic: Balancing Equations
Replies: 3
Views: 140

Re: Balancing Equations

Can you calculate. 9-6 =? Express the result as O2.
by ChenBeier
Tue Nov 29, 2022 7:52 am
Forum: Chemistry forum
Topic: Balancing equations (pls help)
Replies: 1
Views: 73

Re: Balancing equations (pls help)

Fe(OH)2NO3+HNO3=Fe(NO3)2+H2O wrong
Fe(OH)2NO3+ 2 HNO3=Fe(NO3)3 + 2 H2O

H2SO4+K2SO4=K(SO4)2+H2 wrong
H2SO4+K2SO4= 2 KHSO4

N2O5 (excess) + NaOH =??
N2O5 (excess) + NaOH => NaNO3 + HNO3

SO3+HCl (less) =??
SO3 + HCl => ClSO3H
by ChenBeier
Fri Nov 25, 2022 10:28 am
Forum: Chemistry forum
Topic: Confusion over Electrolysis and Conventional current.
Replies: 4
Views: 79

Re: Confusion over Electrolysis and Conventional current.

You have only to know current is the flow of electrons in an electrical field. They are negative charged and travel from minus to plus. The Anode is the place where the oxidation takes place and the cathode is the reduction place. In electronics or electric the current flow from plus to minus. Not m...
by ChenBeier
Fri Nov 25, 2022 5:29 am
Forum: Chemistry forum
Topic: Confusion over Electrolysis and Conventional current.
Replies: 4
Views: 79

Re: Confusion over Electrolysis and Conventional current.

First electrons are negatively charged and they will travel from a negative point to a positive one. So in an electrolysis the negative point is called cathode, the positive point is called Anode. The Anode is everytime the point where the oxidation chemically takes place. So in the case of molten N...
by ChenBeier
Mon Nov 21, 2022 12:25 pm
Forum: Chemistry forum
Topic: Doubt chemical cr2032 battery
Replies: 1
Views: 62

Re: Doubt chemical cr2032 battery

It was discussed already in the other Forums.

Dangerous compounds are LiPF6 and others, what can leak out.
by ChenBeier
Mon Nov 21, 2022 2:51 am
Forum: Chemistry forum
Topic: Preparation of javel water from NaCl
Replies: 3
Views: 83

Re: Preparation of javel water from NaCl

That is a total different thing. That is a method to develop chlorine.
The writer ask to make NaOCl. You used it and not made it.
by ChenBeier
Sun Nov 20, 2022 8:55 am
Forum: Chemistry forum
Topic: Preparation of javel water from NaCl
Replies: 3
Views: 83

Re: Preparation of javel water from NaCl

You have to combine NaOH and Cl2 Chlorine.
This can be obtained by electrolysis of NaCl. Need good stirring.

2NaCl + 2 H2O => H2( cat.) + Cl2 (anode) + 2 NaOH

2 NaOH + Cl2 => NaOCl + NaCl + H2O
by ChenBeier
Mon Nov 07, 2022 12:00 pm
Forum: Chemistry forum
Topic: What happen when polypropylene becomes brittle?
Replies: 1
Views: 129

Re: What happen when polypropylene becomes brittle?

Polypropylen should not be used below 0°C. It will crack and bigger and smaller particles also powder will be developed.
In comparison Polyethylen can go down to - 40°C. So 3xchange the Containers for safety reason.
by ChenBeier
Sun Nov 06, 2022 11:16 pm
Forum: Chemistry forum
Topic: Chlorine gas
Replies: 5
Views: 193

Re: Chlorine gas

Correct
by ChenBeier
Sun Nov 06, 2022 10:39 am
Forum: Chemistry forum
Topic: Chlorine gas
Replies: 5
Views: 193

Re: Chlorine gas

NO Read it correctly.

1.1) HCl + H2SO4 + MnO2
2) NaCl + H2SO4 + MnO2

Both mixtures contain MnO2, so Chlorine will be developed in both cases.
by ChenBeier
Sun Nov 06, 2022 10:37 am
Forum: Chemistry forum
Topic: Unknown products (once again)
Replies: 3
Views: 152

Re: Unknown products (once again)

It was the question which products are formed, there is more NH3 as H2O. It was not told if everything takes place in water.
If so it would be
Cd(NH3)4](OH)2 + (NH4)2S + 4 H2O => CdS + 6 NH3* H2O
by ChenBeier
Sun Nov 06, 2022 10:32 am
Forum: Chemistry forum
Topic: is Ni(ClO4)2•6H2O a complex ?
Replies: 4
Views: 244

Re: is Ni(ClO4)2•6H2O a complex ?

CuSO4 is none, but [Cu(H2O)4]SO4 x H2O is one
by ChenBeier
Sun Nov 06, 2022 7:38 am
Forum: Chemistry forum
Topic: Chlorine gas
Replies: 5
Views: 193

Re: Chlorine gas

Both