Hydroxy aldehydes a and b readily cyclize to form hemiacetals. draw one of the stereoisomers formed in this reaction from both a and b. select why this process gives an optically inactive product mixture from a, and an optically active product mixture from b.

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.