Materials
1. Two 250ml beakers, one 500ml beaker
2. Electronic scale
3. Glass stirring rod
4. Pickling salt, water samples (warm & cold), and food coloring (blue and yellow)
5. Something to take pictures with
1. Two 250ml beakers, one 500ml beaker
2. Electronic scale
3. Glass stirring rod
4. Pickling salt, water samples (warm & cold), and food coloring (blue and yellow)
5. Something to take pictures with
First, we measured the mass of each beaker without the water & recorded the weight of the beaker in grams.
Beaker #1: 113.7 grams Beaker #2: 118.5 grams
Beaker #1: 113.7 grams Beaker #2: 118.5 grams
Next, measure 250ml of cold water into Beaker #1 & 250ml of warm water into Beaker #2. Add 20 grams of salt & 5 drops of blue food coloring into Beaker #1. Stir until all the salt has dissolved. Add 5 drops of yellow food coloring into Beaker #2. Mass each beaker of water and record the new mass. After recording that, calculate the mass, volume and density of the water in each beaker.
Beaker #1: 306.1 grams Beaker #2: 295.0 grams
Beaker #1: 306.1 grams Beaker #2: 295.0 grams
Mass
Volume (ml) Density (g/ml) |
Cold, Salty Water
323.1 250 1.2924 |
Warm, Fresh Water
294.4 250 1.1776 |
Observations:
1) Explain what you observed in the 500ml beaker.
- When we poured the liquid from beaker #1 into the 500ml beaker the water started to turn green.
2)Carefully tilt the beaker (do not spill any liquid) and hold it at a tilt for 15 seconds. Then gently (but quickly) place the beaker back on the table and observe what happens to the layers.
- We observed that another layer was created on top of the other layer.
The Big Picture:
1) What color do you expect the third layer to be?
- I expect the third color to be green.
2) Where do you think the third layer will be formed?
- I think the third layer will be formed in the middle.
3) Using the information from the density you calculated earlier, what density do you expect this third layer might be?
- The third layers density would be between density beaker 1 and density beaker 2.
4) To create a third layer you would use a stirring rod to mix between the layers.
Lesson Review:
1) The thermal stratification of the oceans is when there are different layers of temperature. It occurs because at the ocean surface, there is sunlight on the ocean where it is warming up the surface and as it gets deeper it gets cold because the sunlight is not touching the surface.
2) The name of temperature stratification is vertical stratification.
3) Thermal stratification of the ocean is important because temperature of the ocean is very important to living organisms. It is important because every organism live in different layers of the ocean to survive.
1) Explain what you observed in the 500ml beaker.
- When we poured the liquid from beaker #1 into the 500ml beaker the water started to turn green.
2)Carefully tilt the beaker (do not spill any liquid) and hold it at a tilt for 15 seconds. Then gently (but quickly) place the beaker back on the table and observe what happens to the layers.
- We observed that another layer was created on top of the other layer.
The Big Picture:
1) What color do you expect the third layer to be?
- I expect the third color to be green.
2) Where do you think the third layer will be formed?
- I think the third layer will be formed in the middle.
3) Using the information from the density you calculated earlier, what density do you expect this third layer might be?
- The third layers density would be between density beaker 1 and density beaker 2.
4) To create a third layer you would use a stirring rod to mix between the layers.
Lesson Review:
1) The thermal stratification of the oceans is when there are different layers of temperature. It occurs because at the ocean surface, there is sunlight on the ocean where it is warming up the surface and as it gets deeper it gets cold because the sunlight is not touching the surface.
2) The name of temperature stratification is vertical stratification.
3) Thermal stratification of the ocean is important because temperature of the ocean is very important to living organisms. It is important because every organism live in different layers of the ocean to survive.