Think about the substances of each mixture. which substance is soluble in its mixture a sugar in water b sand in water c oil in water or d pebbles in sand

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

since electrons are negative the answer is neagtaive

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante