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Question of the Day

Question of the Day. Question: List a couple of ways you think could make sugar cubes dissolve faster. Answer: … … …. Turn In: Welcome Back Stations. Properties of Seawater. What do you see?. The Blue Planet. What makes water so special?. High heat capacity

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Question of the Day

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Presentation Transcript

  1. Question of the Day Question: List a couple of ways you think could make sugar cubes dissolve faster. Answer: … … … Turn In: Welcome Back Stations

  2. Properties of Seawater

  3. What do you see? The Blue Planet

  4. What makes water so special? • High heat capacity • High latent heat of vaporization • High latent heat of fusion • Density of solid less than density of liquid • Dissolving power

  5. What makes the oceans so special? • 70% of Earth covered by water • But…

  6. What is seawater made of? • The ocean is one big solution • Dissolved solids (Na, Cl, Mg, Ca, S) • Dissolved gases (CO2, O2)

  7. World Ocean Salinity • Average salt by volume 3.5% • Salinity reported in Practical Salinity Units (PSU) or parts per thousand ‰ • Salinity of 3.5% ≈ 35 PSU ≈ 35 ‰ • Monterey Bay ≈ 33.5 ‰ • San Francisco Bay varies from 0 - 35 ‰ depending on location

  8. Where is San Francisco Bay 0% Salt?

  9. Surface Salinity Map The saltiest water is found in areas colored RED (Mediterranean Sea) The least salty water is found in areas colored BLUE (the north pole)

  10. Density of Seawater • D=m/v (g/cm3) • Density of seawater depends on • Salinity-- more salt = more mass • Higher density • Temperature— colder water = less volume • Higher density • Depth-- higher pressure = less volume • Higher density • Density influences ocean circulation below the surface

  11. Most Humans Float in the Dead Sea • Dead Sea: • 290 ‰ salt • 1.17 g/mL density • Humans: • 9 ‰ salt (blood) • 1.1 g/mL density

  12. Seawater & Global Warming • What would happen to the SOLIDS dissolved in seawater as the water warms due to global warming? A. More of them would dissolve B. Less of them would dissolve C. There would be no change

  13. Seawater & Global Warming • What would happen to the SOLIDS dissolved in seawater as the water warms due to global warming? A. More of them would dissolve B. Less of them would dissolve C. There would be no change

  14. Seawater & Global Warming • What would happen to the GASES dissolved in seawater as the water warms due to global warming? A. More of them would dissolve B. Less of them would dissolve C. There would be no change

  15. Seawater & Global Warming • What would happen to the GASES dissolved in seawater as the water warms due to global warming? A. More of them would dissolve B. Less of them would dissolve C. There would be no change

  16. Seawater & Global Warming So what does that mean?  increasing the temperature (global warming) changes how solids and gases can dissolve in the ocean

  17. Seawater & Global Warming So what does that mean? global warming is changing the chemistry of our oceans!  changing the chemistry of our ocean affects marine life, and ultimately YOU  So, how does the ocean affect you?

  18. Raise your hand if any of the following statements are true for you. • I eat fish/ seafood regularly • I eat ice cream regularly • I drink chocolate milk • I wash my hair with shampoo

  19. Seawater & Global Warming • If you raised your hand, you use a product that comes from the ocean. That means that changes in the ocean can affect you!

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