Name _________________________________________ I. Date ________________ Class __________________ Testing Concepts Directions: In the blank at the left, write the letter of the term that best completes each statement. _________ 1. All substances are built from ______. a. compounds b. oxygen c. metals d. atoms _________ 2. About ______ elements are found on Earth. a. 9 b. 90 c. 900 d. 9,000 _________ 3. A(n) ______ is a homogeneous mixture of particles so small they cannot be seen without microscopes and will never settle to the bottom of their container. a. solution b. element c. molecule d. plasma _________ 4. A(n) ______ is a mixture that settles upon standing. a. solution b. colloid c. suspension d. element _________ 5. A(n) ______ is a mixture that does not scatter light. a. solution b. colloid c. suspension d. element _________ 6. Any characteristic of a material that you can observe without changing the identity of the substances that make the material is a(n) ______. a. physical property c. invisible property b. chemical property d. none of these _________ 7. A change in size, shape, or state of matter is called a(n) ______ change. a. physical b. chemical c. atomic d. impossible _________ 8. The process for separating substances in a mixture by evaporating a liquid and recondensing its vapor is called ______. a. precipitation b. sifting c. distribution d. distillation Directions: Identify each statement as true or false. If the statement is false, change the underlined word(s) to make it true. ________ 9. A substance is a type of matter without a fixed composition. ________ 10. An ion is a substance in which the atoms of two or more elements are combined in a fixed proportion. ________ 11. A mixture in which different materials can be distinguished easily is called a homogeneous mixture. ________ 12. A heterogeneous mixture contains two or more gaseous, liquid, or solid substances blended evenly throughout. Chapter Resources • Classification of Matter 31 Name _________________________________________ Date ________________ Class __________________ II. Understanding Concepts Skill: Concept Mapping Directions: In the concept map below, write in the correct terms in the spaces provided. Mixtures can be can be heterogeneous which are homogeneous which are which are 2. 1. such as such as milk muddy water 3. such as vinegar Skill: Understanding Cause and Effect Directions: Answer the following question in complete sentences. 4. Imagine that you are walking outside on a misty night carrying a flashlight. As the road you are on dips down, you can see more of the flashlight beam in front of you. When it rises up, the beam is less visible. Explain what could be causing this effect. Chapter Resources • Classification of Matter 32 Name _________________________________________ Date ________________ Class __________________ Directions: Identify each item on the left as either a physical change or a chemical change. 5. A tree is cut down. ________________________ 6. Parts of a tree are made into a table. ________________________ 7. A tree is turned into sawdust. ________________________ 8. The snow on a tree melts. ________________________ 9. A tree burns down. ________________________ III. Applying Concepts Writing Skills Directions: Answer the following questions using complete sentences. 1. Suppose a stream were gradually to wear away a rock bed, breaking it into particles and carrying the particles far away. Would you say the rock had undergone physical or chemical weathering? Why? 2. Evaluate “If there is only a physical change, all the mass remains,” a friend says. “It’s only in a chemical change that mass is destroyed. ”How would you respond? 3. Analyze If you went swimming in the ocean and then let your bathing suit dry without washing it, you might find it stiffened with salt. Where does the salt come from? Chapter Resources • Classification of Matter 33
