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Tutor profile: Kc M.

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Kc M.
Graduate with M.S. and over 6 years of experience in assisting undergraduate students develop expertise in chemistry.
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Questions

Subject:Inorganic Chemistry

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Question:

Determine the oxidation state and coordination number of the metal ion in the complex ion. [Co(NH3)3Cl3]-

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Kc M.

Since all charges need to be equal to -1, then we can set up an algebraic equation to solve for the charge of Co which is the metal ion in this complex ion. Co is X in the following algebraic equation NH3 is neutral (0) and Cl has a charge of -1. Therefore, X + 3(0) + 3(-1) = -1 X = -1 + 3 = +2 So the oxidation state of Co is +2 The coordination number is defined as the number of molecules or ions directly bound to the metal atom. Three NH3 molecules and three Cl- ions are bound directly to the Co atom; therefore the coordination number is, 3 + 3 = 6. The coordination number is 6.

Subject:Chemistry

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Question:

Hemoglobin (Hb) is an oxygen transport protein, and there are approximately 300 million Hb molecules per red blood cell. The reaction between oxygen and Hb is given by: Hb (aq) + 4O2 (g) ↔ Hb(O2)4 (aq) + heat Indicate what effect (increase, decrease, no change) each of the following changes will have on the amount of Hb(O2)4 (aq): a) The blood travels through the lungs, where it picks up O2 (g). b) A patient has a high fever and the body's temperature is raised from 37 degrees Celsius to 40 degrees Celsius. c) A catalyst is added to the reaction.

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Kc M.

This questions uses le Chatelier's principle, which describes the qualitative behavior of a system where there is an externally induced change on the systems chemical equilibrium. When a system at equilibrium is subject to a change in either concentration, temperature, volume, or pressure, the systems then changes to reach a new equilibrium, this change counteracts the applied change. a) Increase in Hb(O2)4 (aq); in this example the change to the system is an increase in O2 (g), when this increase in O2 (g) (reactant) occurs more of the products will be formed. In our case we are interested in the effects the change (O2) has on the product, Hb(O2)4 (aq). If more O2 (g) is added then more Hb(O2)4 (aq) will be produced. b) Decrease in Hb(O2)4 (aq); in this example Heat is a product, if more heat is added to the system how will the system adjust to that change to reach a new equilibrium? To adjust for an increase in Heat (product) there will be a decrease in Hb(O2)4 (aq) (which is the other product). c) No change in Hb(O2)4 (aq); a catalyst may effect the rate of the reaction however it will not effect the chemical equilibrium of the reaction. The only factors that effect the chemical equilibrium of the reaction are concentration, temperature, volume, or pressure.

Subject:Basic Chemistry

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Question:

Arrange the following in order of decreasing ionization energy: S, Ca, F, Rb, Si

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Kc M.

F > S > Si > Ca > Rb Highest IE to Lowest IE

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