The teacher made a 0.5M solutions. How is this number read/said?

Zero point five Molar solutions

Explanation:

In chemistry, there are units for expression the concentration of a solution. The concentration of a solution is defined as the amount of solute present in a given volume of solvent. There are diverse units of concentration recognized in chemistry with each one written in its own unique way and with its own unique symbols. Some concentration units are even expressed in percentage.

However, molar concentration is shown as M (upper case letter M). This unit is alternatively written as molL-1. When we write 0.5 M, we pronounce it as zero point five molar.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.