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Properties of Water Practice Quiz. 1. What two elements make up water? Hydrogen (H) & Oxygen (O) H2OH2O 2. Write the chemical formula for water. 3. Is.

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Presentation on theme: "Properties of Water Practice Quiz. 1. What two elements make up water? Hydrogen (H) & Oxygen (O) H2OH2O 2. Write the chemical formula for water. 3. Is."— Presentation transcript:

1 Properties of Water Practice Quiz

2 1. What two elements make up water? Hydrogen (H) & Oxygen (O) H2OH2O 2. Write the chemical formula for water. 3. Is water an element, compound, or mixture? Compound

3 4. Define the term compound. A substance with two or more elements chemically combined in definite proportions. A covalent bond 5. What kind of chemical bond exists between a hydrogen and oxygen atom in a water molecule?

4 6. Draw a model of a water molecule. 7. Draw partial (+) and partial (-) charges on the water molecule you drew above. δ + This symbol also means partial → (+)(+) (+)(+) (-)(-) (-)(-) The parentheses mean ‘partial.’

5 8. Which of the following molecules are polar? (+)(+) (+)(+) (-)(-) (-)(-) (+) (-)(-) (-)(-) (-)(-) (-)(-) (-)(-) (+)(+) (+)(+) (+)(+) (+)(+) water carbon dioxide methane Hydrogen chloride (-)(-) (+)(+) (+)(+) (+)(+) (-)(-) (-)(-) formaldehyde (-)(-) (+)(+) (+)(+) (+)(+) ammonia

6 9. Draw two water molecules and a hydrogen bond. 10. How many hydrogen bonds can a water molecule form with other water molecules? 2 (+) (-) Hydrogen bond The use of dashed lines show that hydrogen bonds are relatively weak. Four 3 1 4

7 11. What term describes the attraction between molecules of the same substance ? Cohesion 12. Without a hydrogen bond, when molecule A moves to the right, will it be able to drag molecule B along with it? A B No

8 13. With a hydrogen bond between them, will molecule A be able to drag molecule B along with it? AB Yes

9 14. What are some examples of water cohesion? Surface tension Drops on a penny Insect trapped in water A proboscis keeps this bee at a safe distance

10 15. What are some examples where surface tension breaks down? “Scaring” pepper Bread clip motor boat

11 16. What term describes the attraction between molecules of different substances ? Adhesion (+) (-) glass Water drop on glass slide

12 17. What will happen when a charged rod or balloon is brought up close to a stream of water ? The water will be attracted toward the rod

13 18. What are some examples of water adhesion? A meniscus that water forms in a glass tube. Capillary action

14 Scotchgard ® carpet 19. What are some examples of anti-adhesion? Wax-layer on leaves Water on wax paper Duck feathers repel water

15 New: Researchers have made an omniphobic material that repels both water and oil. Nature has never made this type of material.

16 20. What is the term which describes the amount of heat energy needed to increase a substance’s temperature? Heat Capacity

17 21. Which substance in the chart is able to absorb the most heat for a given change in temperature? Water

18 22. Which substance in the chart is able to absorb the least amount of heat for a given change in temperature? Air

19 23. What example in the Properties of Water lab demonstrated a low heat capacity for air and a high heat capacity for water? Air-filled balloon Water-filled balloon

20 24. What is a mixture? A substance made up of elements or compounds that are combined but not chemically bonded together. 25. What are some examples of mixtures? water sugar corn syrup CO 2 caramel caffeine citric acid Beef Onion Tomato Lettuce Cheese Ketchup Mustard bread copper zinc

21 26. What are two kinds of mixtures made with water? Solutions and suspensions 27. Compare solvent, solute, and solution. Sugar water solution water solvent what does the dissolving Sugar cubes solute what is being dissolved

22 28. Define a solution? A mixture in which the molecules of the mixed substances are evenly spread out. 29. Which substance(s) below dissolve in water? salt polar oil Non polar paraffin wax Magnesium sulfate polar iodine Non polar

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25 30. What is a suspension? A mixture from which some of the nondissolved particles settle out slowly upon standing. 31. What some examples of suspensions? Chocolate milk Paint Blood

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27 33. What does the pH scale indicate? It indicates the concentration of hydrogen ions (H + ) in a solution. 32. When water breaks apart, what kind of ions are formed? Hydrogen (H + ) ions and hydroxide (OH - ) ions + (-)(-) ( )

28 34. What is the range of the pH scale? 0 to What is the pH of a substance that has an equal number of H + and OH - ions? Substances with a pH below 7 are ________ while those above 7 are _________? Acids Bases

29 37. Acids have more ____ions than _____ ions? 38. The _______the pH, the greater the acidity. lower H+H+ OH _______ have more OH - ions than H + ions? Bases

30 Oven cleaner Lemon juice Human blood Soap Oven cleaner Lemon juice Pure water Human blood Soap 40.Place the 5 substances listed below on the scale to the right. Pure water Click for answer

31 41. The pH in most cells in the human body must stay between _______ and______ ? 42.__________ are weak acids or bases that can react with strong acids or bases to stop sharp, sudden changes in pH. Buffers Buffers play an important role in the process of ______________, where living things are able to maintain a stable, internal environment. homeostasis


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