3 Calcium carbonate is insoluble in water. Sodium chloride is soluble in water.Which sequence of steps is used to obtain a pure, dry sample of calcium carbonate from a mixture of calcium carbonate and aqueous sodium chloride? D A filter→ dry the residue with filter paper → wash the ...
1 A student tried to separate a mixture of salt and sand. Salt, sodium chloride, is soluble in water. Sand, silicon(IV) oxide, is insoluble in water. He added the mixture to water. Three sets of apparatus are shown.XX XXXXXXXXXXXXXX ×。A BC(a)Complete the boxes to identify the ...
To a solution ocompound1(900 mg) in methylene chloride (16.5 ml) was addede PdCl 2 (30mg) and triethylamine (0.229 ml). Triethyl silane was added (2 x 0.395 ml) over2 h. The reaction mixture stirred 1 h and 2 ml of trifluoroacetic acid wasadded. After 30 min the reaction was ba...
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the mixture is heated under reflux for 1hour. It is then cooled and poured into cold water (150 mL). The organic layer is separated, washed with water(100 mL), with 10% sodiumcarbonate solution (2 x 100-mL), and finallywith water (50 mL). The organic extract is treated with activat...
The selective genetic removal of APOE4 from neurons led to a significant reduction in tau pathology, gliosis, neurodegeneration, neuronal hyperexcitability and myelin deficits. Single-nucleus RNA-sequencing revealed that the removal of neuronal APOE4 greatly diminished neurodegenerative disease-associated ...
Metabolism of haem by-products such as bilirubin by humans and their gut microbiota is essential to human health, as excess serum bilirubin can cause jaundice and even neurological damage. The bacterial enzymes that reduce bilirubin to urobilinogen, a ke
A method for producing chlorine dioxide by activating zeolite crystals (which have been impregnated with metal chlorite such as sodium chlorite, and a water-retaining substance such as magnesium sulfate, potassium chloride, or potassium hydroxide, or calcium chloride) with an acid, or activating an ...
mixture is concentrated under reduced pressure with heating and stirring. The distillation headis replaced by a water-cooled reflux condenser, and the residue is dissolved in 1 L of 6 Msodium hydroxide and refluxed for 4 hr. The mixture is saturated with potassium carbonate(ca. 400 g); cooled...
Fig. 1: In vivo OSKM reprogramming requires the gut microbiota and is enhanced by vitamin B12supplementation. a, Mice were pretreated with an antibiotic cocktail administered in the drinking water for 3 weeks (ABX) before, and during, 7 d of doxycycline administration (doxy), with or without...