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Chapter 9 1. Anything that has mass and occupies space is defined as Matter. 2. The basic building blocks of all substances are the elements.6. Substances composed of two or more elements are called Compounds. 13. Mass per unit volume defines the property of Density. 14. If an object is immersed in a liquid of greater density, it will (sink, float). 15. The bending of a light wave because of a change in velocity is called refraction. 16. The physical property of refractive index is determined by the ratio of the velocity of light in a vacuum to light’s velocity in a substance.19. The crystal calcite has two indices of refraction. The difference between these two values is known asBirefringence. 31. Glass that can be physically pieced together has