题目 A6 Hydrogen peroxide, H2O2, is a covalent compound. Hydrogen peroxide decomposes to form water and oxygen according to the equation:2H2O2(1)→2H2O(1)+O2(g)(a) The decomposition of hydrogen peroxide involves a
Mixture or "pure substance" ? In science it is necessary to know exactly what we are talking about, so before we can even begin to consider matter from a chemical point of view, we need to know something about its composition; is the stuff I am looking at a single substance, or is ...
Why do the molecules that have structures such as H_2C=C=CH_2 or HO-CH=CH_2 are unstable? Is air a mixture or a compound ? Explain your answer. What makes a molecule toxic? Explain why styrene (CH2=CHPh) can be polymerized to polystyrene by all three methods of ...
After extraction, the mixture was centrifuged for 5 min with 8000 rpm to obtain the supernatant as the extraction solution, from which 1 mL was taken into a test tube and distilled water was added for a certain proportion of dilution. Then 1 mL of the dilution solution was used...
The formula of the compound is H2O2 . It serves as an oxidising agent in organic chemistry. It also functions as a bleaching agent. The skin benefits from hydrogen peroxide, which also functions as an antibacterial. Additionally, it is used to introduce developing oxygen. Answer and Explana...
The amounts of compound III formed and O2 consumed were stoichiometric with each other, while formation of compound II, an indicative of H2O2, was not observed during the reaction. On the other hand, when an excess amount of superoxide dismutase was included in the reaction mixture, compound ...
Phylloquinone (1 µM), MK4 (1 µM), menadione (3 µM) or Lip1 (0.5 µM). c, Viability of A375 GPX4-KO cells treated with the indicated compound five days after withdrawal of Lip1, which is required to maintain the GPX4-KO cells. d, Left, images of HT-1080 ...
Resveratrol (trans-3,5,4′-trihydroxystilbene) is a polyphenolic compound present in grapes and blueberries and has strong anti-oxidative activities [3, 4]. This compound also exhibits an inhibitory effect on melanin synthesis, anti-inflammatory activity, anti-cancer, and osteoblast differentiation [...
To quantify lipids in cell biomass at a dry weight basis, the sonicated cells were homogenized with 20 mL solvent mixture of chloroform and methanol (2:1 v/v). After 30 min of incubation at room temperature, the upper phase was discarded, while the lower chloroform phase containing ...
ester and hydrogen peroxide (H2O2) react in the presence of a salicylate catalyst forming a peroxy acid ester and phenol; and then the peroxy acid ester decomposes to form more phenol and a highly energetic intermediate, presumed to be a cyclic compound containing four-membered ring dimer of ...