By Martin Stuart Silberberg
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Extra info for Principles of General Chemistry, 2nd Edition
4 nm (V of a sphere ϭ 43r3)? Mass The mass of an object refers to the quantity of matter it contains. The SI unit of mass is the kilogram (kg), the only base unit whose standard is a physical object—a platinum-iridium cylinder kept in France. It is also the only base unit whose name has a prefix. ) The terms mass and weight have distinct meanings. Because a given object’s quantity of matter cannot change, its mass is constant. Its weight, on the other hand, depends on its mass and the strength of the local gravitational field pulling on it.
3C shows, that increase in potential energy is converted to kinetic energy when the particles move together again. Also, when two positive (or two negative) particles are pushed toward each other, their potential energy increases, and when they are allowed to move apart, that increase in potential energy is changed into kinetic energy. Like the weight above the ground and the balls connected by a spring, charged particles move naturally toward a position of lower energy, which is more stable. The chemical potential energy of a substance results from the relative positions and the attractions and repulsions among all its particles.
4 mL). 5 shows some of the types of laboratory glassware designed to contain liquids or measure their volumes. 4 Converting Units of Volume Problem The volume of an irregularly shaped solid can be determined from the volume of water it displaces. 9 mL of water. 5 mL. What is the volume of the piece of galena in cm3 and in L? Plan We have to find the volume of the galena from the change in volume of the cylinder contents. 5 mL) adding it. The units mL and cm3 represent identical volumes, so the volume of the galena in mL equals the volume in cm3.