Trevor H

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364,065
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66.00%
等級
Lv 7
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.
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回覆: 2
2017-12-18 11:25 pm
calculate the mass of KOH to be dissolved in 250cm3 of solution to give pH of 9.given molar mass of KOH=56.1?
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回覆: 2
2017-12-08 2:34 pm
Calculate the mass percent (m/m) for the solute?
[匿名]
回覆: 2
2017-11-21 1:02 pm
How many constitution isomers does C5H10 has? Saturated molecule?
[匿名]
回覆: 2
2017-11-18 5:20 pm
pH of Solution. Help Chemistry?
[匿名]
回覆: 2
2017-11-10 1:22 pm
why does the reaction between silver nitrate and sodium chloride have a minimum conductivity well above zero, while the sulfuric acid?
[匿名]
回覆: 2
2017-10-08 11:23 pm
Calculate the molarity of Na+ in 135 mL of a solution with 5.32 g NaCl and 1.20 g Na2SO4. Please tell and/or show how you got the answer.?
[匿名]
回覆: 1
2017-10-08 12:04 am
Phosphorus has an atomic number of 15 and an atomic weight of 30.974. How many neutrons, approximately, does phosphorus have?
[匿名]
回覆: 3
2017-10-02 7:50 pm
Ammonia fountain?
[匿名]
回覆: 3
2017-09-26 5:13 pm
How many g of ethanol should made from 60 g of glucose?
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回覆: 2
2017-09-26 4:06 pm
Calculating the value of x in the compound CuSO4xH20 . The compound is hydrous copper sulphate crystals .?
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回覆: 3
2017-09-24 7:23 pm
How many grams of water are evaporated by heating 50g of copper II sulfate penta hydrate ?
[匿名]
回覆: 4
2017-08-20 8:37 pm
If I have produced 1 mL of and ester and the density is 1.05 g/mL, what is the mass?
[匿名]
回覆: 3
2017-08-20 5:22 pm
Measuring Gases help?
[匿名]
回覆: 2
2017-08-19 11:33 am
Pls inc. working! If the enthalpy change associated with freezing 3.45 g of water is 1.18kJ, calculate enthalpy change per mole of water.?
[匿名]
回覆: 3
2017-07-25 9:21 pm
A syringe contains 15 mL of air at a pressure of 1.3 atm. What is the new pressure if the plunger is pushed in, so the volume of air is 9 mL?
[匿名]
回覆: 3
2017-07-06 5:28 pm
im doing a report on Gas Stoichiometry and i dont know what the hell im doing. i someone dumb it down?
[匿名]
回覆: 3
2017-05-25 8:12 pm
How to calculate percent mass?
[匿名]
回覆: 1
2017-05-23 9:32 pm
How do you calculate hardness of water?
[匿名]
回覆: 2
2017-05-19 11:53 pm
If 89.6 joules of heat are needed to heat 20.0 grams of iron from 30.0°C to 40.0°C, what is the specific heat of the iron in J/g⋅°C?
[匿名]
回覆: 2
2017-05-16 8:47 pm
Chemistry Help! 5 stars!?
[匿名]
回覆: 2
2017-05-16 12:02 am
Why H2 react with O2?
[匿名]
回覆: 2
2017-05-06 11:08 am
What is the pH of solution?
[匿名]
回覆: 1
2017-05-05 6:38 pm
ALEVEL CHEMISTRY QUESTION!!! ph initially?
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回覆: 2
2017-04-04 12:50 am
Give the IUPAC name for each of the following: https://session.masteringchemistry.com/problemAsset/1791786/1/timberlake11_ch12_p002_b.jpg?
[匿名]
回覆: 2
2017-03-15 2:35 pm
Al2(So4)3 its solubility =6.2×10^-3gr/L?
[匿名]
回覆: 6
2017-02-09 1:45 pm
How can I identify atom from element? Also question about isotopes?!?
[匿名]
回覆: 3
2017-02-08 11:42 am
A jet airplane reaches 833./kmh on a certain flight. How long does it take to cover 335.m? using unit conversions?
[匿名]
回覆: 2
2017-01-29 1:39 am
Chemistry Question: How many molecules would there be in 1.00 mg of a substance that has a molar mass of 100.00 g/mol?
[匿名]
回覆: 1
2017-01-22 1:08 pm
Write the net ionic equation to show the formation of a solid when the following solutions are mixed.?
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回覆: 2
2017-01-13 2:15 pm
Please assist me with this physics/chemistry question?
[匿名]
回覆: 3
2017-01-11 1:28 pm
A weather balloon is inflated to a volume of 26.5 L at a pressure of 747 mmHg and a temperature of 29.7 C?
[匿名]
回覆: 3
2017-01-11 1:54 pm
If 1 mL of a liquid weigh 0.79 gram, what is the density of this liquid in g/mL? Can anyone help me step by step?
[匿名]
回覆: 2
2016-12-31 1:38 pm
300 mL of a 1.65 M HCl solution has a density of 1.50 g/mL. Express the conclusion of this solution in:?
[匿名]
回覆: 2
2016-12-06 3:45 pm
Molecular complete and net ionic equations?
[匿名]
回覆: 4
2016-11-08 3:24 pm
A mixture of oxygen,hydrogen, and nitrogen gases exerts a total pressure of 282 kPa. If the partial......?
[匿名]
回覆: 1
2016-10-26 5:42 pm
can someone help me figure out what C2HOH+K2Cr2O7 go to as a balanced equation?
[匿名]
回覆: 4
2016-10-17 5:36 pm
Chemistry Question?
[匿名]
回覆: 2
2016-10-14 2:37 am
What is the name given to H2S?
[匿名]
回覆: 1
2016-10-09 8:24 am
chemistry question................?
[匿名]
回覆: 4
2016-10-05 6:04 am
how many hydrogen atoms are in acyclic alkane with 8 carbon atoms?
[匿名]
回覆: 2
2016-10-03 5:27 am
Excess mole of HCI is added to NaOH. Why is this procedure used rather than adding a 1:1 mole ratio?
[匿名]
回覆: 4
2016-10-02 6:58 pm
to a solution you have added hydrogen ions to reduce the pH by 1. By how much has the concentration of hydrogen ions been changed?
[匿名]
回覆: 2
2016-09-07 1:40 pm
What is the concentrated of aspirin after this dilution?
[匿名]
回覆: 2
2016-09-03 5:49 pm
the forumla is propane is C3H8 and butane is C4H10 than why in chloropropane the formula is CH3-CH2-CH2-Cl in which there is 7 hydrogen only?
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回覆: 1
2016-08-05 4:27 pm
It is a solution, can we get a solid?
[匿名]
回覆: 2
2016-08-01 6:50 am
Microvan fuel efficiency?
[匿名]
回覆: 3
2016-07-30 8:32 am
2 AuCl3 + 3 Cu → 2 Au + 3 CuCl2 is this a redox reaction?
[匿名]
回覆: 1
2016-07-28 6:43 am
AgNO3 + HCl + H2O?
[匿名]
回覆: 4
2016-07-25 7:50 am
WHAT IS THE PRODUCT OF 12 AND 25?
[匿名]
回覆: 2
2016-07-24 4:01 pm
More Chem Ch. 8 Help!?
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