Chemistry. Will mark

Does the temperature affect the solubility of sugar and salt in water? if it does tell me like different temperatures with different solubilities so i can sketch down a graph

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.