om_3 - 1998 Project Oceanography Spring Series Ocean in...

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Unformatted text preview: 1998 Project Oceanography Spring Series Ocean in Motion 1 Ocean in Motion 3: Gas and Water Do Mix! A) OVERVIEW 1. Ocean in Motion -- Gas and water In this program students will investigate the components of water and learn that it is a complex mixture of organic and inorganic compounds, including gases. We cannot see the air around us but it is also present in water. How can we test for it? What are the compounds dissolved in water and what variables affect their solubility? Students will learn ways in which some substances can be detected and measured. 2. Contents of Packet O Overheads from broadcast a) What's in air? b) Sample graph/data table O Worksheet for use with in-class demonstration a) Temperature and oxygen concentration worksheets O Moving-on activities I. It's Soup II. Air Cares (O 2 and CO 2 , Part 1 and Part 2) III. "Variable" graph B.) PROGRAM PREPARATION 1. FOCUS POINTS O Gases in air and seawater a) Seawater is a complex mixture, consisting of particulate matter, dissolved solids, and gases. b) The atmosphere contains a large number of gases, but 99% of the total consists of nitrogen and oxygen. c) All of the gases found in the atmosphere can also be found in water, and the amount of a gas present in water is controlled by its solubility. d) Factors which affect a gas solubility in water include: temperature, salinity, partial pressure. 1998 Project Oceanography Spring Series Ocean in Motion 2 2. ADDITIONAL a) Pre-Program Demo If you participated in Oceans in Motion II, the students have already seen this demonstration, yet you may wish to re-evaluate with your class in terms of gases dissolved in seawater. Compare the density of saline and fresh water by coloring each with food dye before pouring them into a transparent container. Which water sinks to the bottom? Which rises to the top? What are the effects of stirring the mixture? Just as solids are dissolved in water, so too are gases. 2) Vocabulary Solubility => having the quality of being dissolved in a given solvent Saturation =>the condition of being unable to hold or contain anymore; filled to capacity Partial pressure of gases =>the pressure that one component of a gas would exert if it were mixed with others in a container Temperature => the degree of hotness or coldness of an environment measured on a standard scale Salinity => the total grams of salt in 1 kg of water 3) Related Concepts Variables (independent vs. dependent) Constituents of air Constituents of seawater Water; structure (hydrophobic bonds) and properties(density, freezing point, melting point, surface tension, latent heat of vaporization, latent heat of melting, heat capacity) Equilibrium C) SHOWTIME 1) Broadcast topics This broadcast will link into discussions on gas solubility, relationships of gases found in both air and water, and how some of them arrived in each location. 1998 Project Oceanography Spring Series Ocean in Motion 3 a)Whats in water?a)Whats in water?...
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om_3 - 1998 Project Oceanography Spring Series Ocean in...

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