Properties of Matter Page 31 of INB

Essential Question Distinguish between a chemical property and a physical property.

Used to help identify substances. Can be observed or measured Physical Properties Characteristics that can be observed without changing the identity of the substance. Color, measurements, texture, shape, or state. Used to help identify substances. Can be observed or measured Physical properties help determine uses.

Physical Properties Density: mass/volume Different from weight, combines mass and amount of space the object takes up. Determine if things can float or sink

Chemical Properties The ability of a substance to combine chemically with other substances. Highly reactive elements are never found by themselves, but low reactive elements almost always are. Describes how a substance changes into a new substance, how it reacts.

Chemical Properties Substances can come together or be broken apart to form new substances. Flammability: the ability of a substance to burn, is a chemical property. Chemical properties can only be measured or observed when a chemical change is taking place.

Review questions: Page 30 of INB 1) List 2 physical and 2 chemical properties. 2) Identify the following as Chemical or Physical. A) Reacts with water B) It is red C) It is shiny and silvery D) Melts easily E) Boils at 100oC F) Is nonflamible G) Has a low Density H) it rusts.

Review questions: Page 30 of INB 3) Describe a use for plastic and why plastic is a good choice for that use. 4) You want to build a raft, what should be one of your considerations in choosing materials. 5) Calculate the density of a rock that has a mass of 454 g and a volume of 100.0 cm3. 6) Calculate the density of a substance with a volume of 2,500 cm3 and a mass of 0.36 g.