Which of the following can be used to produce electrical energy? a. solar cells b. generators c. batteries d. all of these

Amap that uses a range of colors and shading to represent the elevation, depth, or landscape of specific features on earth is a/an map.

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.