Choice beef has gotten more expensive, while select has become cheaper. The result is the price difference between the two grades of meat has exploded to 19 cents a pound from 3 cents a pound just a few months ago, helping to make the higher-quality beef more costly for all shoppers.
Apr 6, 2015. It is usually not a chemical reaction. Bubbles are often the result of agitation of toilet water or cleaning chemicals/detergents in the toilet. If the bubbles persist in foamy consistency even in standing water, it means there might be some denatured proteins in urine.
Question: are you sure about signs of a chemical reaction... in a site that our science teacher gave writes 10 signs and it includes these things... Bubbles of gas appear. Gas-producing reactions run to completion when the gas can leave the reaction mixture.)The lack of temperature change indicates a chemical reaction didn't occur. 4) A chemical reaction did occur when the solutions were combined. 5) The color change of the solution indicates a chemical reaction occurred. 6) A chemical reaction occurred when silver nitrate was added to water.