What does a particular point on a line of a phase diagram represent ?

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?

Do polar molecules have ionic bonds?