Properties of Water What molecule supports all of life
Properties of Water What molecule supports all of life

Properties of Water What molecule supports all of life - PowerPoint Presentation

hadly . @hadly
0 views | Public

Properties of Water What molecule supports all of life - Description

Water Cycle What is a polar molecule Has polar bonds Water has polar covalent bonds Oxygen is more electronegative than H Electrons of covalent bonds spend more time closer to Oxygen than to H ID: 999491 Download Presentation

Tags :

hydrogen water displayed molecules water hydrogen molecules displayed property polar heat temperature bonds surface substance solvent solution benefits properties




Please download the presentation from below link

Download Presentation - The PPT/PDF document "Properties of Water What molecule suppor..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.

Presentation on theme: "Properties of Water What molecule supports all of life"— Presentation transcript

1. Properties of Water

2. What molecule supports all of life?

3. Water Cycle

4. What is a polar molecule?Has polar bonds:Water has polar covalent bondsOxygen is more electronegative than HElectrons of covalent bonds spend more time closer to Oxygen than to HCreates a polar moleculeO region is partially negativeH regions are partially positiveCauses the properties of water


6. HYDROGEN BONDS–Water(H2O)Ammonia(NH3)Hydrogen bond++–+++

7. States of Water

8. How does this change when water is in different states?Slightly positive H of 1 molecule is attracted to slightly negative O of nearby molecule creating a H bond that holds those molecules together

9. Water and PolarityHydrogenbonds

10. What are the Properties of Water?AdhesionCohesionSurface TensionHigh specific heatExpands when frozenUniversal solvent

11. 1. CohesionCohesion – water “sticking” to itself

12. 1. CohesionCohesion contributes to transport of water and dissolved nutrients against gravity in plants

13. 2. AdhesionAdhesion is water “sticking” to something else

14. Cohesion is supported by AdhesionWhat is Adhesion?clinging of one substance to anotherAdhesion of water to cell walls by those same hydrogen bonds

15. Adhesion vs. Cohesion

16. 3. Surface TensionHow is this related to Surface Tension?Surface tension= how difficult it is to stretch or break the surface of a liquid

17. Examples of surface tension

18. Benefits of properties 1-3:Bugs that walk on waterBugs that use air bubble to breathe underwaterLeads to transport of water and its dissolved nutrients against gravity in plantsWater molecules leaving plants by evaporation cause H bonds to tug on water molecules, creating an upward force of water in the plant

19. Water and TemperatureHydrogenbonds

20. 4. High Heat Capacity a.k.a. High Specific Heat Water’s temperature does not change easilyWater can absorb or release a good deal of heat before its overall temperature changes.

21. What is specific heat?the amount of heat that must be absorbed or lost for 1 g of that substance to change its temperature by 1 °C

22. Evaporative Cooling

23. Benefits of having a high heat capacity:Keeps temperatures more constant in bodies of water so animals can survive betterKeeps water warm on a cool day and cool on a hot day, and in turn, cools the air around it on a hot day and heats air around it on a cool dayKeeps temperature from fluctuating greatly due to the fact that oceans cover the earthHelps moderate Earth’s climate Contributes to stability of temperature in lakes and ponds Prevents land organisms for overheating

24. What happens to the ice?

25. 5. Expansion Upon FreezingWater is less dense as a solid than as a liquidIce FloatsBegins freezing when its molecules are no longer moving vigorously enough to break their hydrogen bondsBecomes about 10% less dense


27. Hydrogen Bond angles

28. Benefits of water expanding upon freezing:Fish get to survive in cold temperaturesWe get cold drinks

29. 6. Universal Solvent

30. A few terms regarding solutions…Solution-Liquid that is completely homogeneous mixture of two or more substancesSolvent-Dissolving agent of a solutionSolute-Substance that is dissolvedAqueous solution-Solution in which water is the solvent

31. Solution

32. Suspension

33. Colloid(This is why you should shake milk first!)

34. Why is water a versatile solvent?Due to polarity of the ionsIons have mutual affinity through electrical attraction of the opposite chargesCompounds don’t have to be ionic to dissolve waterDissolve when water molecules surround each of the solute molecules, forming hydrogen bonds with them

35. Hydrophilic – any substance that “loves” water and dissolves easily into itHydrophobic – any substance that “hates” or repels water and will not mix with it

36. Benefits of water’s solubility:Allows the movement of solvents through cohesionMakes the solvent hydrophilic, benefitting cellular processes

37. QUIZ TIME!The model illustrates hydrogen bonding found in water. This attraction between water molecules is the result of water’sA ionic bonding.B polar covalent bonding.C positively charged atoms.D negatively charged atoms.

38. Which property of water is displayed here?

39. Which property of water is displayed here?

40. Which property of water is displayed here?

41. Which property of water is displayed here?

42. Which property of water is displayed here?

43. Which property of water is displayed here?