Name: ______Worksheet Chapter 15 Section 2

PART A: Complete the paragraphs using the terms listed. Some terms may be used more than once.

Chemical change Equals Physical change Chemical change Mixture Physical change Conservation of mass Physical change Physical properties

Scientists try to explain how changes in substances take place. By applying energy, you can tear a sheet of paper into pieces and cause a ______in the paper. On a hot summer day, water vapor will condense into water droplets on the outside of a glass of iced tea. The glass of iced tea is a ______of sugar, tea, lemon, and water. Water is a clear, colorless liquid at room temperature. The words clear and colorless describe two ______of water. The melting of the ice in iced tea is a ______. In comparison, a ______produces new substances. When a candle burns, physical and chemical changes take place. The melting of the wax is a ______. The melted wax, as it burns, combines with gaseous oxygen in air to form water vapor and carbon dioxide gas in a ______. The law of ______states that the masses of all substances before a chemical change ______the masses of all substances after a chemical change.

PART B: Below are two sets of words. Complete the second set by choosing a word from those listed below the blank. The two words must be related in the same way as the first set of words. EXAMPLE Letter is to envelope as pillow is to ______case______case, sheet, soft, bed

1. steam is to water as water is to ______heat, molecules, ice, matter

2. physical is to density as chemical is to ______size, melting, combustible, ice

MG 10-11 FND 3. solid is to steel as gaseous is to ______coal, air, water, gasoline 4. burning is to candle as rust is to ______vaporization, physical property, iron, mixture 5. gold is to gold leaf as copper is to ______ice, wire, mass, rust

PART C: Section Read the following statements. Fill in the blanks with word(s) that complete the ideas. These are not necessarily vocabulary words. These sentences are not word for word from the text either. See text pages 458-465 for help

A. ______—characteristics of a material which can be observed without changing the identity of the substances in the material; examples include color, shape, size, melting point, and boiling point

1. ______—physical description of a substance

2. ______—how a substance acts; for example, magnetism, viscosity, ductility

3. Physical properties such as size and magnetism can be used to ______mixtures.

B. ______—change in a substance’s size, shape, or state of matter

1. Substance does not change ______when it undergoes a physical change

C. ______property—characteristics of a substance indicating that it can change chemically; for example, flammability or light sensitivity of a substance

D. When one substance changes to another substance, a ______has occurred.

1. Some chemical changes are indicated by new substance, ______, or color change.

2. Rust is a chemical changes that occur very ______.

E. Law of ______—Mass of all substances present before a chemical change equals the mass of all substances after the change.

MG 10-11 FND