Carbon Water Filter
Conceptual approaches for the development of dynamic specific activity models of ^1^4C transfer from surface water to humans [An article from: Journal of Environmental Radioactivity] [H] [T] [M]
Array (Digital) Elsevier
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First Year High School Question:
I conducted an experiment in testing Carbon and Hydrogen presence. Well, the procedure follows:
-2 grams of PREVIOUSLY HEATED CuO and a corn-grain amount of sugar were grinded in a mortar.
-The mixture was transferred in a test tube and covered with a rubber stopper with bent glass tubing.
-The test tube was attached to an iron stand in an inclined position, and the other end of the glass tubing was immersed in 5ml Lime water.
-The test tube with the grinded mixture was heated with a bunsen burner.
MY Questions are...
1. Why must the Cupric oxide be previously heated???
and..
2. Can you give me the chemical equations involved in:
a. the decomposition of the sugar
b. the lime water test.
Thank you for your answers...
P.S. please don't flame me with "Do your own HW!" statements...I have an inferiority in this Chemistry subject...
1 - to speed up the rxn (!?)
2- a
C6H12O6 -------> 6C + 6H2O
Carbon then reacts with CuO to produce CO2 +Copper
you notice the reddish brown color of copper
3- B
CO2+Ca(OH)2------> CaCO3+H2O (white ppt is the undissolved calcium carbonate)
hope my answer helps you
Water Transfer Printing (hyrographics) is a process of transferring a film to a part. Some films include Carbon Fiber, Woodgrain, Camo, brushed ...
is there any liquid which is colored whose color is not transmitted to water when it gets in contact with water; it should at the same time be denser than water and immiscible with water or u can also name a coloring agent when added to carbon tetrachloride which will not transfer its color to water when contacted.
Mercury is much denser and has a color that will not transfer, but you would not want to use it is a demo.
Look up online the Steve Spangler 7 layer density column
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First Year High School Question:
Well, the procedure follows:
-2 grams of PREVIOUSLY HEATED CuO and a corn-grain amount of sugar were grinded in a mortar.
-The mixture was transferred in a test tube and covered with a rubber stopper with bent glass tubing.
-The test tube was attached to an iron stand in an inclined position, and the other end of the glass tubing was immersed in 5ml Lime water.
-The test tube with the grinded mixture was heated with a bunsen burner.
RESULTS:
There were brownish-red stains on the lower portions of the test tube.
The lime water turned from colorless to yellow
There was moist.
MY Questions are...
1. Why must the Cupric oxide be previously heated???
2. Can you give me the chemical equations involved in:
a. the decomposition of the sugar
b. the lime water test.
3. What is the role of CuO in the reaction?
Thank you for your answers...
P.S. please don't flame me..I have an inferiority in this Chemistry subject.
Last question.... Why should the rubber stopper with glass tubing be removed first from the lime water before the flame is put off?
Lancenigo di Villorba (TV), Italy
My compliments to your Chemistry's Teacher : he get you an interesting home-work.
Surely, he explained you the Sugar's Chemistry so I start from there.
QUESTION 1)
Why must the Cupric oxide be previously heated?
This reactant is a solid and unsoluble matter : so, it results unable to bring aid from media and its own Activation's Energy states that Solid Phase's Reaction need for Hot Conditions.
QUESTION 2)
Can you give me the chemical equations involved in:
(A)_the decomposition of the sugar
C6H12O6 + 24 CuO ---> 6 CO2 + 6 H2O + 12 Cu2O
if I refer to HEXOSE SUGARs (e.g. C6H12O6, hexose sugars may be Glucose itself) present in the corn
(B)_the lime water test
CO2(g) + Ca(OH)2(aq) ---> CaCO3(s) + H2O(aq)
QUESTION 3)
What is the role of CuO in the reaction?
As I wrote, since the Copper(II) Oxide underwent initial warming it become able as Chemical Oxidizer against Reducing Chemicals, e.g. sugars.
Copper(II) Oxide is CuO or a Blackish matter and it may become Copper(I) Oxide as Cu2O which appears as a reddish stuff.
QUESTION 4)
Every time you are warming a closed container (e.g. the tube) it flows off the gas which starts from inside : the tube diminutes its own pressure under the atmospheric and outer level.
So, you would do a mistake : if you turn off the burner's flame before you disconnect the tube, the lime's water lift up the bent pipe and enter in the tube...a mistake, I said.
I hope this helps you.
For methanol, ethanol, propanol. butanol, pentanol and hexanol i need to find the theoretical energy transfer if they were burned in air (oxygen).
This requires balancing the equations which i have already done but when it comes to the actual calculations, my results have no pattern and aren't all negative numbers (as they should be as they are exothermic.) I know they are wrong but i can't see where I am making the mistakes. If someone could explain, do one example for me, i would be so greatful, here's what you need to know:
The equation: Alcohol + Oxygen ---> Carbon dioxide + Water
Bond values (Kj/mol)
H-C - 413
C-C - 347
O-C - 336
O=O - 498
C=O - 805
O-H - 464
eg. balanced: 2CH3OH + 3O2 ---> 2CO2 + 4H20
for all equations:
O2 = double bond
CO2 = C=0 double bond x2
all other compounds/elements contain single bonds
Thanks so much to anyone who can help, i have been struggling with this for so long now.
other balanced equations if needed:
Ethanol: C2H5OH + 3O2 ---> 2CO2 + 3H20
Propanol: 2C3H7OH + 9O2 ---> 6CO2 + 8H2O
Butanol: C4H9OH + 6O2 ---> 4CO2 + 5 H2O
Pentanol: 2C5H11OH + 15O2 ---> 10CO2 +12 H2O
Hexanol: C6H13OH + 9O2 ---> 6CO2 + 7H2O
In your example, bonds broken =
6 x C-H
2 x C-O
2 x O-H
3 x O=O
Bonds formed =
4 x C=O
8 x O-H
It should work! Remember to compare like with like, so you would halve this value because you started with 2 moles of methanol.
When glucose is oxidized to carbon dioxide and water in cellular respiration, approximately 40% of the energy content of glucose is transfered to
glycolysis
ATP
heat
the citric acid cycle
oxygen
thanks in advance
ATP.
The remaining 60% is in the form of heat.
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#39;Pakistan should pursue reduction in carbon emissions#39; | Carbon ...
Pakistan should also ask for defined mechanisms to ensure the fulfillment of commitments from the developed parties. Furthermore, adaptation should be prime focus of Pakistani negotiators at UNFCCC meetings.
Shakeel Ahmed Ramay, Research Associate of Sustainable Development Policy Institute, and Arshad H Abbassi, Water Expert, Visiting Research Fellow, SDPI presented their review and analysis at a consultation seminar entitled “Role of Pakistan’s Civil Society in the Upcoming Bangkok Negotiations” organized by Sustainable Development Policy Institute (SDPI), in collaboration with Climate Action Network–South Asia (CANSA) and Oxfam GB and PYCN (Pakistan Youth Climate Network) here on Thursday.
Ramay gave a brief introduction of Climate Change since the first actions taken against it was by the UN General Assembly in 1988. UN General Assembly established Intergovernmental Negotiating Committee (INC) for negotiating a framework convention on climate change in 1990.The INC adopted, by consensus, the United Nations Framework for Convention on Climate Change (UNFCCC) on 9 May 1992. The Convention was opened for signatures at the UNCED. He further explained the principle of common but differentiated responsibilities (equity and respective capabilities), and the necessity of developed country Parties to take the lead. He stressed that specific needs and special circumstances of developing country Parties should be given full consideration. Moreover, the Parties should take precautionary measures to anticipate, prevent or minimize the causes of climate change and mitigate its adverse effects.
...Climate change policy myopia — Hot Topic
This is a guest post by associate professor Ralph Chapman, senior researcher Andy Reisinger, professor Jonathan Boston and senior associate Judy Lawrence from Victoria University of Wellington. It’s a succinct explanation of how and why the government’s climate policy is wrong-headed and ineffective, and is required reading for anyone following the policy debate in NZ. It first appeared in the he deal between National and the Maori party over the emission trading scheme raises serious questions about strategic policy making in New Zealand. The agreement has positive features – a price on carbon will apply from mid-2010 in some sectors – but it raises major concerns about the capacity of our democratic institutions to serve the common good of New Zealand and avoid capture by vested interests.
The deal rests on four myths about climate change policy.
Myth 1: Doing the minimum is good enough
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