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When heated tetraketopiperazine does not melt, but turns black at 250°C. [1] Tetraketopiperazine is slightly soluble in water and more so in boiling acetic acid. The solid form has monoclinic prismatic crystals. [1] pK a is 4.8 and the second pK a2 is 8.2. [3]
A sol is a colloidal suspension made out of tiny solid particles [1] in a continuous liquid medium. Sols are stable, so that they do not settle down when left undisturbed, and exhibit the Tyndall effect, which is the scattering of light by the particles in the colloid. The size of the particles can vary from 1 nm - 100 nm.
A hard candy (American English), or boiled sweet (British English), is a sugar candy prepared from one or more sugar-based syrups that is heated to a temperature of 160 °C (320 °F) to make candy. Among the many hard candy varieties are stick candy such as the candy cane , lollipops , rock , aniseed twists , and bêtises de Cambrai .
Whether she’s sharing her family cornbread recipe, baking a batch of gingersnaps or showing us how to make ingenious frozen yogurt bark, we’ll always pause our never-ending scroll to watch her ...
Usually they are suspended in an aqueous phase that is stabilized electrostatically. Colloidal silicas exhibit particle densities in the range of 2.1 to 2.3 g/cm 3.. Most colloidal silicas are prepared as monodisperse suspensions with particle sizes ranging from approximately 30 to 100 nm in diameter.
A way for candy makers to show that a candy was trademarked was to stamp an image or initials on the candy. [2] In the late 19th century and especially the early 20th century, industrial candy making was almost exclusively a masculine affair, and home-based candy making was a feminine affair. [3]
Levothyroxine, also known as L-thyroxine, is a synthetic form of the thyroid hormone thyroxine (T 4). [5] [8] It is used to treat thyroid hormone deficiency (hypothyroidism), including a severe form known as myxedema coma. [5]
This reaction has been used as a gravimetric method for determining antimony, bubbling H 2 S through a solution of Sb(III) compound in hot HCl deposits an orange form of Sb 2 S 3 which turns black under the reaction conditions. [10] Sb 2 S 3 is readily oxidised, reacting vigorously with oxidising agents. [5] It burns in air with a blue flame.