Categories
Ask Chemistry

To solve for the concentration of an unknown, do you use the slope or absorbance divided by slope?

Beer’s Law tells us how to solve for the concentration of an unknown. I have a set of concentrations and absorbance for the same substance, let’s say Copper (II) Sulfate. To solve for the unknown concentration, I graph my data and make a line of best fit. What is the difference between finding the absorbance […]

Categories
Ask Chemistry

How would the addition of sugar (sucrose) affect the dissolved level of oxygen (solubility) in water (or any other solution?)

How would the addition of sugar (sucrose) affect the dissolved level of oxygen in water (or any other solution?)

Categories
Ask Chemistry

Electrophilic addition of alkenes using H2 + lindlar’s catalyst?

If we used Lindlar’s catalyst with an ALKENE , would a reaction still occur? Or is Lindlar’s catalyst specific to alkynes ?

Categories
Ask Chemistry

Aluminium and magnesium alloys becoming powder particles by a strong pressure force, possible or not?

I am making a paper about metals and reactions of metals and i need some help with this issue. Could a poweful impact with an explosion produce powders of aluminium alloys or would the same problem be true for a impact as with high explosives?, that the there is no time during the explosion for […]

Categories
Ask Chemistry

Cadmium Selenide, Cadmium Sulfide, Cinnabar and Lead Oxide toxicity

I have a question about the toxicity of the pigments Cadmium Selenide (Cadmium Red), Cadmium Sulfide (Cadmium Yellow), Mercury Sulfide (Cinnabar or Vermillion) and Lead Oxide (Lead White). Not long ago the EU banned lead-white pigments from use, even for art. It is now generally impossible to get hold of lead-white oil paint on the […]

Categories
Ask Chemistry

Equations for the oxidation reactions of tea teaflavins and EGCG with potassium permanganate

For my chemistry investigation, I used Stamm’s potassium permanganate method to investigate tea tannins with potassium permanganate to find the tannin content of teas. The method assumes complete oxidation of tea polyphenols to carbon dioxide. Assuming that the tea polyphenols consist of only theaflavins, $\ce{C29H24O12},$ and Epigallocatechin gallate (EGCG), $\ce{C22H18O11},$ could someone help me with […]

Categories
Ask Chemistry

Reduction of Organic compounds

I’ve encountered in chemistry quite a lot of reducing agents. However one question strikes me quite often and any research done on the same hasn’t been fruitful. This is in context to organic chemistry. Now for example, in reductive ozonolysis, we often use ozone in combination with Zinc and water. Zinc’s presence ensures reductive results […]

Categories
Ask Chemistry

How to control current and voltage in electrolysis

I am doing an experiment that aims to determine if the rate of electroplating changes with the temperature. I am using a copper rod, a solution of copper(II) ions and a neutral rod to be coated. I also want to keep every other variable the same, which means the voltage across the rods, the concentration […]

Categories
Ask Chemistry

Why are branched isomers less polarisable?

This fact was given as an explanation as to why branched isomers of a compound have lower boiling points. How are branched isomers less polarisable and how does this relate to London dispersion forces?

Categories
Ask Chemistry

Trifluoroiodomethane in basic medium

$$\ce{CF_3I + NaOH(aq) -> Major Product}$$ The Major product, according to me, should be ditrifluoromethyl ether $\ce{CF3-O-CF3}$. The hydrogen on the $\ce{-OH}$ group is quite acidic and hence reacts with $\ce{CF3I}$ to give a stable compound according to the following reaction mechanism: However, the textbook gives the following reaction mechanism and claims that the product […]