Study Guides - Cherokee County Schools

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Name Date Class 4 <strong>Study</strong> Guide 80 Chemical Reactions and Energy Chemical Reactions and Energy Directions: Answer the following questions using complete sentences. 1. What is a catalyst? 2. What is an exothermic reaction? 3. What is an inhibitor? 4. What is an endothermic reaction? Chapter 21 Directions: Decide if each reaction below involves a catalyst, an inhibitor, or neither. Write C for catalyst, I for inhibitor, or N for neither in the blank at the left. 5. Brushing the cut edges of fruits with lemon juice can prevent the darkening effect that contact with air can cause. 6. In the human body, proteins called enzymes help to speed up chemical processes. The proteins are not changed during these chemical processes. 7. Aluminum oxide, which forms on exposed aluminum, protects the aluminum from further reaction with the air. 8. Food preservatives called BHT and BHA slow down the spoilage of certain foods. 9. Nickel is used to increase the rate of methane formation from the addition of hydrogen and carbon monoxide. Nickel does not permanently change. Directions: Decide if each reaction below is endergonic or exergonic. In the blank at the left, write EN for endergonic or EX for exergonic. 10. When a lit match is placed in alcohol, the alcohol ignites producing heat and light. 11. Energy in the form of electricity can be added to water to break apart the water molecules into hydrogen gas and oxygen gas. 12. A piece of coal placed in a furnace gives off heat and light before turning to ash. 13. When ammonium chloride mixes with water, the solution formed feels cold. Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. Name Date Class Directions: Use the terms from the word bank to fill in the blanks in front of the correct phrases below. alloy polar solvent crushing solute stirring heating solution water 1. a mixture that has the same composition throughout 2. a word for a molecule that has a positive region and a negative region 3. a substance that dissolves other substances, such as water 4. a way to make particles move faster to increase the dissolving rate 5. a way to increase the rate of dissolving by increasing the surface area of the solute 6. a substance that dissolves in water, such as sugar or carbon dioxide 7. the most common solvent in the world 8. a solution of solids, such as brass or sterling silver 9. a way that speeds the rate of dissolving by bringing more fresh solute into contact with more fresh solvent Directions: Fill in the chart for five solutions. Directions: List the three steps involved in the process of sugar being dissolved in water. 15. 16. 17. 1 10. 11. 12. 13. 14. <strong>Study</strong> Guide How Solutions Form Solvent Solute Special Name, if any Chapter 22 How Solutions Form 81
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Study Guides - Cherokee County Schools

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