# Search results

1. ### G-field - help very confused

Homework Statement please look at the following statements: 1: due to air resistance, total energy of a satelliit will decrease gradually, dissipated into internal energy. As T.E. = -GMm/2r, r will decrease, hence K.E. increases (K.E.=GMm/2r), implies speed increses. (T.E.=PE+KE) 2: 98...
2. ### Florine with water and aqueous Fe2+

Florine can oxidize water to oxygen and hydrogen floride. When reacts with aqueous Fe2+, water is being oxidized to give hydrogen peroxide and some OF2,(due to the strong oxidizing power of F2?) so the reaction is unsuitable to carried out, right? That means meanwhile Fe2+ is also oxidized to...
3. ### Buffer action

could the equation - pH=pKa+log([A]/[HA]) - be applied for the case of strong acid? Although the percentage of dissociation of strong acid/base is very high, there still exists a equilibrium, right? secondly, if i tried to explain the resistance in pH of buffer *in terms of* the above...
4. ### Intensity on IR-spectrum

http://x5.freeshare.us/view/?121fs535045.jpg In the above diagram, what does the % of transmittance means? I know the % of transmittance is the reverse of % absorption, but there are more C-H bond per molecule than C=O, why the intensity for C=O is higher(higher absorption)? I really have no...
5. ### 2 Questions:metling point in unsaturated fat; nerve impulses

Here is my first question: As we all know that, fat and oil(lipid) are triglycerides, they differ in the hydrocarbon tail with fat(saturated fat) without C=C, whereas lipid(unsaturated fat) having C=C in the hydrocarbon tail. My question is why does having a C=C will lower the metling point...