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: 5
2016-07-20 4:00 pm
What is the actual volume of water?
[匿名]
回覆: 1
2016-07-19 5:50 pm
in neutralization reaction, salt and water are produced with evolution of?
[匿名]
回覆: 3
2016-07-19 3:43 pm
What is the molality (m) of a solution prepared by dissolving 125.00 g of ethylene glycol (C2H6O2) in 2.25 kg of water?
[匿名]
回覆: 2
2016-07-13 8:53 am
Please change into an ionic equation: copper sulfate + sodium hydroxide ---> copper hydroxide + sodium sulfate?
[匿名]
回覆: 2
2016-07-12 2:30 pm
NH3+H2O = ? decomposition right?
[匿名]
回覆: 3
2016-07-12 9:01 am
What is the correct reaction? CH3-COOH+Na2CO3->CH3-COONa+NaHCO3 or CH3-COONa+NaHCO3->CH3-COOH+Na2CO3?
[匿名]
回覆: 5
2016-07-06 4:33 am
Which of the following has six significant digits? 0.00005600 km 56.0000 km 0.00056 km 560,000 km?
[匿名]
回覆: 2
2016-06-27 4:07 pm
If 2.400 Moles of calcium nitrate reacts with 393.70g lithium phosphate, how much precipitate in grams will be produced?
[匿名]
回覆: 2
2016-06-24 7:54 am
What is the net ionic equation?
[匿名]
回覆: 2
2016-06-19 5:11 pm
How much oxygen would be needed to react with 1kg of hydrogen? Explain your answer?
[匿名]
回覆: 5
2016-06-19 6:08 am
A compound contains 2.4 moles of carbon and 3.6 moles of oxygen. What is the percent composition by mass of each element in the compound?
[匿名]
回覆: 3
2016-06-17 2:56 pm
What is the correct name?
[匿名]
回覆: 2
2016-06-16 3:53 pm
Chemistry Help!?
[匿名]
回覆: 2
2016-06-16 3:43 pm
what is the formula mass of Mg(oH)2?
[匿名]
回覆: 3
2016-06-15 8:47 am
Demonstrate that the following chemical equation illustrates the conservation of mass in chemical reactions:?
[匿名]
回覆: 11
2016-06-14 4:41 pm
How much CaCl2 do you need to make 500 mL of 1 M of CaCl2?
[匿名]
回覆: 2
2016-06-14 10:30 am
A little help in chemistry?
[匿名]
回覆: 3
2016-06-13 3:40 pm
chemistry.?
[匿名]
回覆: 3
2016-06-13 6:45 am
Write balanced complete ionic equation for NaOH(aq) HNO 3 (aq)→H 2 O(l) NaNO 3 (aq)?
[匿名]
回覆: 3
2016-06-13 7:28 am
Define Homologous series and Functional group?
[匿名]
回覆: 3
2016-06-12 1:02 pm
why would a solution with H+ concentration of 1.00 x 10^-7 M be said to be neutral?
[匿名]
回覆: 3
2016-06-12 1:30 pm
why are these compounds wrong? 1,1-dichloro-5-propylhexane & 2-methyl-4-chloro-3heptenoic acid. what are their correct names?
[匿名]
回覆: 1
2016-06-08 3:28 am
calculate the moles of oxygen in 8 dm cube of gas at R.T.P?
[匿名]
回覆: 1
2016-06-08 3:34 am
calculate the mass of 48 dm cube of nitrogen gas at R.T.P AND the volume occupied by 4 g of carbon dioxide gas at R.T.P?
[匿名]
回覆: 1
2016-06-08 4:29 am
A 700 mL NaCl solution is diluted to a volume of 1.17 L and a concentration of 8.00 M . What was the initial concentration C1?
[匿名]
回覆: 2
2016-06-05 8:07 am
How do you find out when something expires when it has no year?
[匿名]
回覆: 3
2016-05-25 4:20 pm
Chemistry Check My Answer!?
[匿名]
回覆: 1
2016-05-22 9:47 am
What does camphor smell like?
[匿名]
回覆: 2
2016-05-17 6:28 am
How many miles of HCl would it take to make 50 mL of .1 M solution?
[匿名]
回覆: 2
2016-05-04 4:18 pm
Calculate molar concentration of H+?
[匿名]
回覆: 6
2016-05-02 2:42 pm
the compound name for lithium chlorine and oxygen?
[匿名]
回覆: 3
2016-03-30 7:11 am
A 250.0 mL buffer solution initially contains 2.5×10^2 M of HCHO2 and 2.5×10^2 M of NaCHO2.?
[匿名]
回覆: 2
2016-03-25 2:09 pm
explain reaction of NO2 with H2SO4?
[匿名]
回覆: 1
2015-12-15 7:46 am
At what temperature does carbon monoxide explode?
[匿名]
回覆: 4
2015-12-12 2:24 pm
science homework help???!!!?
[匿名]
回覆: 1
2015-12-08 5:11 am
What is the volume occupied by 21.6 g of argon gas at a pressure of 1.38 atm and a temperature of 389 K ?
[匿名]
回覆: 1
2015-12-07 5:50 am
A strong base- strong acid titration curve. 0.1 M HCl is being added to 0.1 M NaOH 50 ml. help needed.?
[匿名]
回覆: 1
2015-11-30 6:01 am
N factor of H2SO4 in water? H2SO4 + H2O -> SO42- + H3O+ Or H2SO4 -> SO42- + 2H+?
[匿名]
回覆: 2
2015-05-25 4:17 pm
Can anyone explain to me this chemistry question?
[匿名]
回覆: 2
2015-11-29 8:19 am
In the preparation of ammonia, why should the mixture of ammonium chloride and calcium hydroxide be a paste, not dry powder?
[匿名]
回覆: 2
2015-11-29 7:00 am
In the preparation of ammonia, why should the mixture of ammonium chloride and calcium hydroxide be a paste, not dry powder?
[匿名]
回覆: 1
2015-11-11 6:31 pm
Give the solubility product?
[匿名]
回覆: 2
2015-10-23 4:06 pm
How do you convert 0.075m to cm?
[匿名]
回覆: 1
2015-10-20 4:03 pm
What weight of AgCl can be obtained by precipitating all of the ...(cntd)?
[匿名]
回覆: 1
2015-10-02 6:01 pm
At constant temperature the volume of a given mass of a gas is doubled, then the density of a gas become....?
[匿名]
回覆: 3
2015-09-04 8:26 am
What is the Bronsted Acid of H3PO4 + HOH -------> H3O+ + H2PO4- ?
[匿名]
回覆: 3
2015-09-01 10:21 am
propan-2-ol is MISCIBLE in water? and in cyclohexane? and what about water and cyclohexane together? thanks?
[匿名]
回覆: 5
2015-08-31 12:38 pm
what can be observed when sodium hydroxide is added to ammonium chloride?
[匿名]
回覆: 2
2015-08-31 1:15 pm
Can concentrated hydrochloric acid turn a piece of filter paper black?
[匿名]
回覆: 1
2015-08-15 10:34 am
For a reaction 0.20g of NaOH are required for completing the reaction. How many ml of 0.5M NaOH should be added for this requirement?
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