Chapter 2: Properties of Matter Section 1: Matter has observable properties.

Physical Properties Physical properties of a substance can be observed without changing the identity of the substance. Density, mass, color, size, volume, and texture are examples of physical properties.

Density is the relationship between the mass and the volume of a substance. Density= Mass ÷ Volume

Any change in a physical property of a substance is a physical change Any change in a physical property of a substance is a physical change. The identity of the material remains the same during the change. Examples of physical changes include cutting a material, breaking it, and changing its state.

Chemical properties describe how substances form new substances. To observe chemical properties in a substance, you must see a chemical change.

To observe the combustibility of a piece of paper, for example, the paper must burn. The products that result from burning the paper differ in identity from the paper itself.

Signs of a chemical change include the production of an odor, a gas, or a solid and a change in temperature or color.

Other examples of chemical properties include reactivity, tendency to corrode, and toxicity.

Shape Color Texture Volume Size

Measuring an object’s mass does not change the substance to another substance. Changing the shape of a substance does not transform the substance itself.

measurement; amount of matter in a given volume g/cm3, D = m/V

V= l x w x h 3 cm x 4 cm x 5 cm = 60 cm3. D= m/V D= 480 g/60 cm3 D= 8 g/cm3.

wool being transformed into a sweater, stretching a rubberband, breaking a piece of clay in half

When something burns, the substance changes into a new substance, so it is a chemical change.

substances forming other substances used to identify c. properties change of one into another wood burning; iron rusting

Color Change Temp Change Bubbles Formation Light Emission