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.
The formation of a gas is another sign of a chemical change that can be seen or heard. Visually, gas formation can be seen when bubbles form in a liquid after two or more substances are mixed together. For example, if vinegar is added to baking soda, the mixture bubbles furiously as a chemical reaction occurs.