QQ: How does density affect the ocean currents? How does salinity affect the ocean? What impact does the Gulf Stream have upon climate? In what direction does heat move?

It’s a Scientific Fact!

Today’s Objective: I can explain how density affects water.

Clean up: Do you believe this beaker was washed? Me neither. Be sure to wash and dry glassware to get all particles out…even ones you can’t see!

Sugar and Water Lab

Draw this data table. Amt of H20 Sugar Color Density Position

Fill the tea pot with water and turn it on Fill the tea pot with water and turn it on. We just want it to warm up, not boil. Pour 230 ml of water into each of 4 beakers. Add 3 drops of blue food coloring to the first beaker, 3 yellow to the second, 3 red to the third, and 3 green to the fourth.

Add 30 mL of sugar to the blue beaker Add 30 mL of sugar to the blue beaker. Stir until all of the sugar is dissolved. Add 60 mL of sugar a little at a time, stirring well to make sure it is all dissolved to the yellow beaker. Add 90 mL of sugar to the red beaker. Again, stir well until all is dissolved. If you can’t get it to all dissolve, see the teacher to supersaturate it.

Add 120 mL of sugar to the green beaker Add 120 mL of sugar to the green beaker. Add it a little at a time stirring well to dissolve all of the sugar. Stirring is a critical step. You must continue stirring until all of it is dissolved. No shortcuts. Start with the beaker containing with the most sugar – green. Using a dropper and add the first layer of sugar water. Continue adding until you have added 25 mL.

7. Now things get challenging 7. Now things get challenging. Carefully drip the next dense layer onto the surface of the first. The best technique is to place the dropper right above the surface of the first layer and against the glass. Slowly drip the next color onto the first. This will take a lot of patience. Go slow. The colors will begin to mix at first and then your original color will start to show.

Repeat with the next dense color and the least dense color until you have stacked all of the colors. Answer the questions on the next page.

Calculate the density of the different colors of water Calculate the density of the different colors of water. Record this in your data table. How does sugar affect the density of the water? Why did we put the green water first? What do you predict would happen if we started with the blue water first? Why? Why did we use warm water? What would happen if we stirred the water?