Chapter 7 Properties of Matter

Bell Work

Student Learning Objectives: SPI TOC:

Matter is anything that has mass and volume. Everything in the universe is made up of some type of matter. Mass is how much matter is in an object. Weight is how much force is acting on the object. Weight is the measure of the gravitational force exerted on an object. The more mass an object has, the greater the object’s weight.

Physical properties of matter can be observed without changing the identity of the matter. Density - the amount of matter in a given space, or volume. Solubility – the ability of a substance to dissolve in another. Solubility – the ability of a substance to dissolve in another. Ductility – the ability of a substance to be pulled into a wire. Ductility – the ability of a substance to be pulled into a wire. Malleability – the ability of a substance to be rolled or pounded into thin sheets. Malleability – the ability of a substance to be rolled or pounded into thin sheets. State – physical forms of matter Thermal conductivity – transferred heat State – physical forms of matter Thermal conductivity – transferred heat

To find an objects density (D), first measure its mass (m) and volume (V). Then use the following equation: D = m V

A physical change affects one or more physical properties of matter. (the identity doesn’t change) Examples of different physical changes: melting ice, cutting your hair, sanding wood, crushing a can, mixing oil and vinegar. Chemical properties describe a substance based on its ability to change into a new substance with different properties.

Chemical properties include: Flammability – ability to burn Flammability – ability to burn Reactivity with water, acid, and oxygen causing a change in the identity of a substance Reactivity with water, acid, and oxygen causing a change in the identity of a substance Chemical properties can only be observed when a chemical change takes place. A chemical change occurs when one or more substances are changed into new substances with different properties.

Clues to chemical changes: fizzing and foaming, color change, production of heat, light, sound or odor Physical changes can be reversible by physical means. Chemical changes cannot be undone by physical means.