8 th Grade Science Test Review: Elements, Compounds, and Mixtures Chapter 9
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1 8 th Grade Science Test Review: Elements, Compounds, and Mixtures Chapter 9 1. Which of the following represents an element? A. Be B. NaCl C. H 2 O D. CO 2. Which of the following contains only compounds? A. Au, Ni, Cu, Fe B. H 2 O, H 2 O 2, NaOH, CO 2 C. NH 3, KNO 3, Hg, Ne D. Na, NaCl, Pb, C 6 H 12 O 6 3. What type of substance is composed of two or more different elements that are chemically combined through a chemical reaction? A. Element B. Compound C. Metal D. Mixture 4. How do elements join to form compounds? A. Never in the same ratio B. Always in a 1 to 1 ratio C. Randomly D. Always in a specific ratio 5. Use the diagram below to answer the question that follows. Which of the following describes the shaded elements in the diagram shown above? A. Compounds B. Metalloids C. Metals D. Nonmetals
2 6. Which of the following substances is a compound? A. Salt B. Copper C. Salt water D. Tea 7. Use the table below to answer the question that follows. CATEGORY 1 CATEGORY 2 CATEGORY 3 Shiny Dull Some shiny, Some dull Good conductor of heat Poor conductor of heat Some conduct heat Good conductor of electricity Poor conductor of electricity Some conduct electricity Malleable and ductile Solids are brittle. Somewhat malleable/ductile Includes most elements Includes some elements Includes few elements Which of the following represents the data table shown above? A. Category 1 is a nonmetal, Category 2 is a metalloid, and Category 3 is a metal. B. Category 1 is a nonmetal, Category 2 is a metal, and Category 3 is a metalloid. C. Category 1 is a metal, Category 2 is a metalloid, and Category 3 is a nonmetal. D. Category 1 is a metal, Category 2 is a nonmetal, and Category 3 is a metalloid. 8. Which of the following represents an a mixture of elements and compounds? A. B. C. D. 9. Which of the following best describes a mixture? A. Made of elements only and not compounds B. Made using a specific ratio of elements C. Can be easily separated using physical methods such as evaporation, distillation, a magnet, or a centrifuge D. Is only separated by chemical means
3 10. A combination of salt and sugar is best described as a mixture because A. The grains taste different from one another. B. Both the salt and sugar grains are in the same state of matter. C. No new chemical bonds are formed between the salt and sugar grains. D. A new product is formed when the salt and sugar grains are combined. 11. Copper (Cu) reacts with oxygen (O) to form copper oxide (CuO). The properties of CuO are most likely A. Different from copper or oxygen B. Similar to both copper and oxygen C. Similar only to copper D. Similar only to oxygen 12. A periodic table of the elements is shown below. A property that elements Fe, Co, and Ni have in common is that they are all A. Chemically inert B. Compounds C. Metals D. Dull and Brittle 13. Which of these molecules is made up of three elements? A. Oxygen, O 2 B. Water, H 2 O C. Sulfuric Acid, H 2 SO 4 D. Sodium chloride, NaCl 14. A teacher gives a student an unidentified liquid in a beaker. Which statement can the student correctly make about the liquid without knowing any of its specific properties? A. It is made up of atoms. B. It is a compound. C. It is a good electrical conductor. D. It is a nonmetal.
4 15. A periodic table of the elements is shown below. The circled elements share which characteristics? A. They are nonmetals. B. They are all made out of atoms. C. They are compounds. D. They are metalloids. 16. The jar below contains two types of beans. Which statement BEST explains why the jar contains a mixture? A. The ingredients keep their individual properties and are not chemically combined. B. There are multiple ingredients. C. There are different elements in the beans. D. The beans are similar in size.
5 17. Which statement BEST compares pure water and lemonade? A. Water and lemonade are both mixtures. B. Water and lemonade are both compounds. C. Water is a mixture, and lemonade is a compound. D. Water is a compound, and lemonade is a mixture. 18. Formulas for four different compounds are shown. H 2 CO 3 C 6 H 12 O 6 Ca(OH) 2 HCl What element is not in any of the four compounds? A. Carbon B. Oxygen C. Calcium D. Helium 19. The diagram shows the structure of a water molecule. Each circle in the diagram represents A. A cell B. An atom C. A compound D. A mixture 20. Which combination of substances will produce a compound? A. Sodium and chloride B. Sugar and water C. Salt and pepper D. Dressing and salad
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