Trevor H

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I have recently retired from a life spent in technical management in the papermaking industry. After completing my studies towards a diploma in Science I started working as a Chemical Technician in a paper mill, later technical Manager of a mill. I continued my studies in the paper technology field including time on a Rotary Scholarship in Canada. For the last 25 years of my working career I was employed to head up the paper chemicals department of a large multinational chemical company. This entailed hands on application of the company's products in the mills. My final assignment was to manage an emulsion polymerisation plant. When I retired I decided to make some contribution to the underpriviliged and I undertook the teaching of chemistry and physics to socially deprived high school students. I live in the city of Durban, in South Africa and the school where I am helping is rural caterng for the education of children living in "informal housing" some of them without parents.
[匿名]
回覆: 4
2020-09-13 10:56 pm
A sample of mercury with a mass of 114.0g was combined with 17.9g of oxygen gas, and the resulting reaction gave 123.1g of mercury(II)oxide.?
[匿名]
回覆: 3
2020-08-09 8:40 am
Chemistry help?
[匿名]
回覆: 1
2019-09-04 1:20 pm
What is the ratio of pH=pka-1? plz briefly explain?
[匿名]
回覆: 3
2019-06-03 7:40 am
Organic Chem Help?
[匿名]
回覆: 1
2019-02-19 9:56 am
How do you find out how many grams are in one liter of a 1.0M solution?
[匿名]
回覆: 2
2019-01-22 2:37 pm
A gas mixture contains 0.850 mol of N2, 0.250 mol of H2, and 0.100 mol of CH4. What is the mole fraction of H2 in the mixture?
[匿名]
回覆: 2
2018-12-08 10:29 pm
How much air is needed for the complete combustion of 5 L of ethanol (ρ=0,79 g/сm3)? [A: 28,85 m3] C2H5OH + 3 O2 = 2 CO2 + 3 H2O?
[匿名]
回覆: 1
2018-12-03 2:17 pm
How do you write the balanced equation for the oxidation of 1-propanol by acidified permanganate solution?
[匿名]
回覆: 1
2018-11-06 10:28 pm
What would have been the fate of hydrogen peroxide if MnO2 was not added?
[匿名]
回覆: 2
2018-09-09 6:22 pm
why we reflux a reaction instead of direct heating?
[匿名]
回覆: 5
2018-07-31 10:39 pm
How many grams is 4.2x1024 atoms of sulfur?
[匿名]
回覆: 2
2018-07-08 4:21 pm
How did they get the value of pKa in this example?
[匿名]
回覆: 3
2018-06-07 6:37 pm
Limiting reactant stoichiometry question? How many grams of ammonia formed during the reaction with 100g of hydrogen and 100g nitrogen?
[匿名]
回覆: 3
2018-06-04 2:58 pm
the reaction of 5.0g of pentane (C5H12) with a 5.0 g of oxygen gas produces 20.4 g of CO2 what is the percent yield of this reaction?
Christopher
回覆: 2
2018-06-03 7:42 pm
@chemistry?
[匿名]
回覆: 2
2018-06-03 6:28 pm
CHEMISTRY (pls show ur steps in detail )?
[匿名]
回覆: 2
2018-06-03 5:21 pm
buffer question?
[匿名]
回覆: 3
2018-05-27 3:26 pm
What is the equation for the acid ionization constant of HF?
[匿名]
回覆: 5
2018-05-20 10:29 am
Can Neon form compounds? If so, what is it?
[匿名]
回覆: 2
2018-05-13 12:34 pm
chemistry (pls show all ur step obtaining)?
[匿名]
回覆: 2
2018-05-13 4:38 pm
You are given a ~0.1 M NaOH solution and need to standardize it, so you will be making a 250.00 mL 0.1 M KHP solution....?
[匿名]
回覆: 3
2018-04-15 5:25 pm
How many moles of oxygen atoms are there in 0.500mol of hydrated iron(II) ammonium sulfate, (NH4)2Fe(SO4)2•6H2O(s)?
[匿名]
回覆: 2
2018-04-10 1:31 pm
Chemistry question help! Consider the following reaction: 2SO2(g)+O2(g)→2SO3(g) What is the theoretical yield of SO3?
[匿名]
回覆: 4
2018-03-19 11:11 pm
How many grams of chlorine can be liberated from the decomposition of 52.0 g of AuCl3 by this reaction? 2 AuCl3 ---> 2 Au + 3 Cl2?
[匿名]
回覆: 3
2018-03-19 9:52 pm
Consider the equation 2NO2(g) <--> N2O4(g).?
[匿名]
回覆: 3
2018-03-16 5:54 pm
Mole Concept Help?
[匿名]
回覆: 4
2018-03-16 4:25 pm
When crystal of copper sulphate are strongly heated the Residue obtained is what?
[匿名]
回覆: 2
2018-03-08 3:47 pm
calculate the liters of a 1.90 M NaCl solution to obtain 12.0 moles of NaCl?
[匿名]
回覆: 2
2018-03-07 3:14 pm
A 120 ml flask contains 2.7 micrograms of O2 at 17 degrees celsius. What is the pressure in the flask?
[匿名]
回覆: 2
2018-03-04 3:53 pm
Calculate the relative molecular mass?
[匿名]
回覆: 5
2018-02-14 4:22 pm
If 2.0 g of copper(II) chloride react with excess sodium nitrate?
[匿名]
回覆: 3
2018-02-08 6:20 pm
write the equation for the reaction bewteen 1-chloripropqne with ammonia. name the organic comppund formed. Write the mechanism for reaction?
[匿名]
回覆: 2
2018-02-06 7:34 am
What happens when 2NA(NO3) + Cu(OH)2 gets heated?
[匿名]
回覆: 2
2018-01-27 3:23 pm
Finding pH, pOH, H3O+, and OH- given 2 aq solutions. The problem I am having trouble with is here: https://imgur.com/a/pq0KN?
[匿名]
回覆: 4
2018-01-26 11:43 am
How many moles of CO are produced when 1.9 mol of C reacts?
[匿名]
回覆: 2
2018-01-25 12:33 am
Help with calculating the molarity of cation, anion, and pH?
[匿名]
回覆: 4
2018-01-24 1:06 pm
Can someone help me with finding the unknown element in this problem? I seriously need help!!!?
[匿名]
回覆: 2
2018-01-19 12:29 pm
Chem solution question, pls help?
[匿名]
回覆: 3
2018-01-18 12:56 am
CHEM HELP PLS?
[匿名]
回覆: 3
2018-01-17 3:45 pm
Sig fig substraction help!? chem?
[匿名]
回覆: 2
2018-01-16 7:11 pm
Can someone please help me with steps?
[匿名]
回覆: 2
2018-01-09 11:07 pm
Write the balanced chemical equation that occurs if Hg(s), HgCl2(aq), Mn(s), and MnCl2(aq) are mixed together?
[匿名]
回覆: 9
2018-01-09 4:37 pm
How strong is stomach acid?
[匿名]
回覆: 2
2018-01-07 7:08 pm
Im double checking my answer to a chemistry question, Ill but the question itself on details?
[匿名]
回覆: 2
2017-12-30 8:32 pm
pH calculations - please help?
[匿名]
回覆: 3
2017-12-30 3:16 pm
A10 gr mixture of C2H6 and C3H4 gases are combusted?
[匿名]
回覆: 4
2017-12-29 6:19 pm
URGENT!! How many moles are in 8mL of 3 percent H2O2?
[匿名]
回覆: 3
2017-12-28 2:19 pm
What is reason for reversible and irreversible solution?
[匿名]
回覆: 3
2017-12-27 8:01 pm
A mixture of NaCl and NaBr have a mass of 2.0 g and the mass of Na is .75 g. HOW do you find the mass of NaBr? The book answer is NaBr=.224g?
[匿名]
回覆: 2
2017-12-19 1:58 pm
What is the mass in grams of a sample of water when the temperature drops from 75.00∘C to 56.00∘C and 800.0 J of energy are lost?
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