Friday
December 19, 2014

Posts by trigger


Total # Posts: 20

chemistry
Compound C does not bind to the receptor as effectively as acetylcholine . Explain briefly why this might be the case. (Two or three sentences)(again if the post does not show right, two of the CH3 should be above and below the N^+ with a line directly above and below the N^+ ...
January 29, 2009

chemistry
Compound B is acetylcholine, a neurotransmitter found in the human body. It binds to receptors, leading to nerve stimulation. (in case this post does not show correct, two of the CH3 should be above and below the N^+ , AND THE O should be above the C) COMPOUND B CH3 O | | H3C...
January 29, 2009

chemistry
RE: Le Chatelier's principle. this was the whole question i was given. Write a short account of around 250 words in total, with reference to Le Chatelier’s principle, in which you explain the following: (i) The effect on the equilibrium yield of nitric oxide of ...
January 28, 2009

chemistry
What was Le Chatelier's principle on the effect on the equilibrium yield of nitric oxide of increasing the pressure and The effect on the equilibrium yield of nitric oxide of increasing the tempreture
January 27, 2009

chemistry
what examples of the types of functional groups which will have to be present in the receptor sites in order for the two types of binding interaction to take place.
January 27, 2009

chemistry
In terms of electronic configuration and bonding, why is xenon regarded as an unreactive gas?
January 21, 2009

maths
what is 28.11 to 3 significant figures
January 18, 2009

chemistry
What was Le Chatelier’s principle, in The effect on the equilibrium yield of nitric oxide of increasing the pressure?
January 6, 2009

chemistry
Silicon tetrachloride exists as a covalent molecule. What is the valency of silicon in this molecule? Give reasons for your answer.
January 4, 2009

chemistry
Ammonia reacts with oxygen in the presence of a platinum catalyst to give nitric oxide and water, according to the following gas phase equilibrium: 4NH_3(g) + 5O_2(g) <---> 4NO(g) + 6H_2O(g) ÄH = −906 kJ mol^−1 What is an appropriate equilibrium ...
January 3, 2009

chemistry
In a sealed vessel xenon tetrafluoride, XeF4, reacts with hydrogen gas to give xenon gas and hydrogen fluoride gas. What is a balanced chemical equation, including state symbols, for this reaction. thankyou.
January 3, 2009

chemistry
Covalent bonds are formed when two atoms share electrons. The pairs of electrons which are shared between atoms and hence number of covalent bonds, can be represented by the number of lines drawn between the symbols for the atoms. For example, a single bond is represented by a...
December 30, 2008

chemistry
The reaction between potassium metal and chlorine gas is described by the following thermochemical equation K(s) + ½C_l2(g) = KCl(s) ÄH =–437 kJ mol–1 What will be the enthalpy change (to 2 significant figures) for the reaction when 6.0 g of potassium ...
December 30, 2008

maths
How do you express the oppersite symbol to ^ ie mg^2 but i want it so the 2 becomes at the bottom of the g
December 30, 2008

CHEMISTRY
Use the following balanced chemical equation to calculate the mass of carbon dioxide produced from the burning of 5.50 kg of jet fuel which can be represented by the molecule C12H26. You should quote your answer to 3 significant figures in units of kg. The relative atomic ...
December 28, 2008

math
If i place a dish of ice outside in the sun, The ice has a mass of 0.59 kg and a surface area of 0.039 m2. Assuming that the ice is originally at 0 °C and using my answer for part b, which was 1370w/m^2 * 49 * 0.039m^2 = 26.18 watts, How long do i have to wait until all ...
December 16, 2008

psychology
As a psychology student myself, I would go for A.
December 16, 2008

math
According to Einstein’s equation, what mass is equivalent to an energy of 6.7 × 10–14 J? You should use a value for c of 3.0 × 108 m s–1 and give your answer in kilograms, in scientific notation and to two significant figures. thx trigger.
December 12, 2008

physical
Light is shone on a metal and photoelectrons are emitted. Can you tell me the three things from the list below which might cause the photoelectron emission to stop. Decreasing the intensity of the light Increasing the frequency of the light Decreasing the wavelength of the ...
December 10, 2008

maths
Can you please tell me the kinetic energy of a house sparrow of mass 28.6 g moving at a speed of 13 m s–1. can your answer be given to an appropriate number of significant figures and include the correct SI units. thx trigger.
December 10, 2008

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