A pure substance is any substance with a definite chemical composition and cannot be broken down through separation techniques.

various

Explanation:

A pure substance cannot be separated into 2 or more substances by physical means such as crystallization or distillation nor by mechanical means such as sifting, filtering, or using a magnet. ... Water (H2O) (4) is a pure substance because it can NOT be separated into simpler substances by physical or mechanical means

answer: at room temperature (roughly 20 degrees c), you can dissolve 203.9 grams (or 200 grams) of sugar in 100 ml of water. as water temperature increases, the amount of sugar that will dissolve increases, up to about 500 grams of sugar in 100 ml water at 100 degrees c.

explanation: