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WRITTEN OUTPUT (15 points) Multiple Choice. Write the CAPITAL LETTER of your correct answer on the blank before each number. 1. Which does not belong to the group? A. Sodium chloride B. Copper C. Aluminum D. Iron 2. Which of these is the correct chemical formula for water? A. HO2 B. H3O C. H2O D. HOS 3. Which of the following is a compound? A. nitrogen B. carbon dioxide C. aluminum D. Carbon 4. O is the symbol for oxygen, while H is a symbol for A helium B. hafnium C. hassium D. hydrogen 5. A pure substance that is made of two or more different elements that are chemically combined. A. a compound B. a solution C. a mixture D. an element 6. Table sugar is sucrose, while table salt is also called A sodium carbonate C. sodium carbonate B. sodium chloride D. sodium sulfate 7. What happens when two or more different elements join chemically? A. The physical properties of the substances remain the same B. A mixture is formed. C. A substance that is the same as the elements is formed D. A compound is formed 8. Elements play an important role in the human body. Which of the following is correct? A Aluminum is an essential mineral for bones and teeth. B. Sodium is used as a sweetener. C. Oxygen is a gas needed for breathing D iron is essential for healthy hair and skin
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