Scum is formed when hard water is treated with soap. Reason Hard water contains calcium and magnesium ions. When soap comes in contact with hard water, these ions form calcium and magnesium salts of fatty acids which are insoluble in water. These calcium or magnesium salts precipitate out in the form of scum.

Severe anaphylaxis is characterized by potentially life-threatening compromise in airway, breathing and/or the circulation, and may occur without typical skin features or circulatory shock being present”. 1 Anaphylaxis thus lies along a spectrum of severity, ranging from mild objective breathing problems (such as mild wheezing) to circulatory “s.

Lifestyle tips Some people with type 2 diabetes may need to inject insulin to manage their blood sugar levels. Other treatments may include oral medications, non-insulin injectables, and.

e.g. phenol to salicylaldehyde. With amines. Dichlorocarbene is an intermediate in the carbylamine reaction. In this conversion, a dichloromethane solution of a primary amine is treated with chloroform and aqueous sodium hydroxide in the presence of catalytic amount of the phase-transfer catalyst.

Aspirin is prepared by the reaction between acetic anhydride and salicylic acid. acetic anhydride + salicylic acid → aspirin + acetic acid C4H6O3 + C7H7O3 → C9H8O4 + C2H4O2 mmAml + mBmm → mllCmll +mlD What is the theoretical yield of aspirin ( C) if you reacted 4.32 g of acetic anhydride ( A) with 2.00 g of salicylic acid ( B )? Solution

Acetone reacts with 2,4-dinitrophenylhydrazine (DNP) to form 2,4-dintrophenylhydrazone (yellow precipitate). Class 12 Class 11 Class 10 Class 9 Class 8 3080 solutions Selina - Concise Chemistry - Class 9 1500 Selected Problems In Chemistry for JEE Main & Advanced 2928 solutions Lakhmir Singh, Manjit Kaur - Chemistry 10 1797 solutions

When glycerol is treated with an excess of HI, it produces - 1. Allyl iodide 2. Propene 3.