Sample a is a hard crystalline solid, which does not break easily. sample b is a solid that readily dissolves in water. sample c is a liquid that evaporates at room temperature. sample d is a colored liquid that conducts electricity. which sample is a covalent compound?

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains