Tutor profile: Dominic A.
Subject: Organic Chemistry
What is pKa? How does this relate to mechanisms/reactions?
pKa can be thought of as a molecule's binding affinity for hydrogen atoms. The lower the pKa, the stronger the acid. Strong acids have a "low" hydrogen binding affinity, and more readily "give up" their hydrogen atoms to molecules that are less acidic (higher pKa). This is why a strong acid such as HCL (pKa: -8) can donate its hydrogen atom to water (pKa: 15) to form H3O+ (pKa: -1.7). HCL + H2O --> H3O+ pKa: -8 15 -1.7
Subject: Biomedical Science
Neurobiology - When an action potential initally occurs, the neuron becomes ____ . When measured, this is shown by the voltage becoming closer to zero.
A: Depolarized. The voltage "rising" to zero coincides with a decrease in polarity. Polarity occurs when an area is partially negative or positive - often due to differences in ion concentrations.
Subject: Basic Chemistry
In chemistry, what do elements in the same 'group' have in common with one another?
These elements have the same number of valence electrons. These electrons determine the extent that bonds may be formed.
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