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From the Institute of Minerals, Materials and Mining, Most aluminium foil is made from pure aluminium, but increasingly alloys are used to improve properties and reduce the thickness required. If you want to make sure that the Aluminium foil you're using is pure, the only way would probably to ask the manufacturer. Other than that, it could be the case ...


2

Reynolds Kitchens says Relnolds Wrap® is $98.5\%$ $\ce{Al}$ with the rest mostly $\ce{Fe}$ and $\ce{Si}$ to improve strength. You know this because when you dissolve it in $\ce{NaOH}$ solution to produce $\ce{H_2}$ a black residue remains undissolved; pure $\ce{Al}$ metal would leave no residue. Perhaps $\ce{Al}$ wiring would be more nearly pure because ...


2

On the question as to how dangerous is H2S let me detail some facts that I find problematic. Here is a good paper. I summarize some of my findings: First, H2S after initial exposure can deaden your sense of smell (10-minute exposure at 50-100 ppm impairs the sense of smell). So, one may not really have an accurate conception of the magnitude of one's time ...


1

To quote a source as you also noted: Copper hydroxide Cu(OH)2 is metastable. It easily transforms into copper oxide CuO more stable, either in the solid state by a thermal dehydration or at room temperature, in aqueous basic solutions. In the solid state, the transformation is performed at a relatively low temperature, 423 K. In the current case, a basic ...


1

Careful, as sodium percarbonate (basically $\ce{3Na2CO3.2H2O2}$) is usually marketed as a chlorine-free bleach. The latter usually has an additive, TAED, which acts as a key activator. See, for example, Wikipedia on OxiClean, where not even listed on the label is TetraAcetylEthyleneDiamine, which is apparently commonly employed as a bleach activator in many ...


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