Reading Questions Page 14

Ledgerwood Period D Chem 1H

Eamon Barkhordarian 9/12/09

Homework #9 Reading Questions pg. 14 1. a. Physical properties are characteristics observed or measured without changing the identity of a substance. A chemical property relates to the substances ability to undergo changes that transform it into different substances. b. A physical property is melting and boiling point. A chemical property is when charcoal burns and it combines with oxygen in the air to become carbon dioxide gas. 2. a. physical change b. physical change c. chemical change 3. A solid has structured particles that stay in the same place and have a definite volume and shape. A liquid has particles that can slide past each other so it has a definite volume but indefinite shape. Gas particles move freely in the area they are given so indefinite volume or shape. 4. Mixtures are combinations of 2 or more kinds of matter where it retains its own identity and properties. A pure substance has every sample with the same characteristic properties. Example is salt mixed with water. 5. The sucrose purification would result in a pure substance because the two seem to have the same composition. Sugar beets would result in a mixture.