Search found 1542 matches

by ChenBeier
Sat Aug 28, 2021 7:49 am
Forum: Chemistry forum
Topic: Final temperature
Replies: 4
Views: 4125

Re: Final temperature

Why do you mix kJ and kcal, it is the same thing only different unit.
by ChenBeier
Fri Aug 27, 2021 11:18 am
Forum: Chemistry forum
Topic: calculation of neutralization heat
Replies: 8
Views: 8437

Re: calculation of neutralization heat

Correct.
by ChenBeier
Fri Aug 27, 2021 10:41 am
Forum: Chemistry forum
Topic: Help
Replies: 3
Views: 3684

Re: Help

You have to express the MnO2 in first equation with the second equation .

Its like 1/2 + 1/3 = ?
by ChenBeier
Fri Aug 27, 2021 10:37 am
Forum: Chemistry forum
Topic: calculation of neutralization heat
Replies: 8
Views: 8437

Re: calculation of neutralization heat

You have to calculate how much mol you have with the datas given. Do you you have 1:1 or something else. But you have to get the ratio 1:1.
by ChenBeier
Fri Aug 27, 2021 7:53 am
Forum: Chemistry forum
Topic: calculation of neutralization heat
Replies: 8
Views: 8437

Re: calculation of neutralization heat

The unit of heat released is kJ/ mol. So what is the maximum mol what react according NaOH + HCl => NaCl + H2O ?
by ChenBeier
Tue Aug 24, 2021 4:12 am
Forum: Chemistry forum
Topic: Calculation of standard molar enthalpy of formation
Replies: 2
Views: 3419

Re: Calculation of standard molar enthalpy of formation

You calculate for 4C + 6H2 => 2 C2H6 -167 kJ/mol

But you can devide to 2C + 3H2 => C2H6 -83,55kJ/ mol ~ - 84 kJ/ mol
by ChenBeier
Tue Aug 24, 2021 1:40 am
Forum: Chemistry forum
Topic: Questions on chemical structures of compound or elements
Replies: 3
Views: 4156

Re: Questions on chemical structures of compound or elements

Explain why should Li+ and Mg 2+ have more electrons as protons?
Of course 1b iscorrect.
by ChenBeier
Mon Aug 23, 2021 11:54 pm
Forum: Chemistry forum
Topic: Questions on chemical structures of compound or elements
Replies: 3
Views: 4156

Re: Questions on chemical structures of compound or elements

1 d is wrong, the others are correct.
by ChenBeier
Mon Aug 23, 2021 7:40 am
Forum: Chemistry forum
Topic: Flavouring unflavoured Essential Amino Acids / BCAAs
Replies: 3
Views: 3788

Re: Flavouring unflavoured Essential Amino Acids / BCAAs

Sorry we dont discuss for self made pharmacy.
by ChenBeier
Mon Aug 23, 2021 2:48 am
Forum: Chemistry forum
Topic: Flavouring unflavoured Essential Amino Acids / BCAAs
Replies: 3
Views: 3788

Re: Flavouring unflavoured Essential Amino Acids / BCAAs

What is the topic, for what you need the Amino acids.
by ChenBeier
Mon Aug 23, 2021 2:45 am
Forum: Chemistry forum
Topic: 4-Nitrophthalonitrile Supplier
Replies: 1
Views: 3119

Re: 4-Nitrophthalonitrile Supplier

No commercials here.
by ChenBeier
Mon Aug 23, 2021 2:45 am
Forum: Chemistry forum
Topic: Question based on Titration and pH computation
Replies: 9
Views: 8046

Re: Question based on Titration and pH computation

Compare the theoretical consumption with the real one.
Calculate the moles you used and the moles of the NaOH react.
by ChenBeier
Sun Aug 22, 2021 3:39 am
Forum: Chemistry forum
Topic: Making Potassium Citrate from Citric Acid From Lemons
Replies: 4
Views: 4218

Re: Making Potassium Citrate from Citric Acid From Lemons

Carbonate will be destroyed by acid to CO2 and water. So this can be used. Hydroxid get neutralization to water. All others have not effekt.
by ChenBeier
Sat Aug 21, 2021 3:24 am
Forum: Chemistry forum
Topic: Making Potassium Citrate from Citric Acid From Lemons
Replies: 4
Views: 4218

Re: Making Potassium Citrate from Citric Acid From Lemons

Potassium hydrogen carbonate, potassium carbonate and potassium hydroxide can be used.