Assessment of the students will occur in several ways. While the students are speaking about their observations, I will listen to the discussion going on between them and their group members. This will help me see if the students are understanding the basic concepts. I will only be able to assess a few of the students during the creative drama. I will try to select the students that I did not hear while they were experimenting.
During colloquium, I will also have a chance to listen to the whole group discuss the difference between salt water and fresh water. Predict- The students will make predictions about what will happen to the egg in the different types of water.
This is a wonderful website that I used while preparing for this lesson. It has many great ideas and experiments, all dealing with the ocean. It also has a list of questions your students should be able to answer after completing the experiment. What do you think will happen if you pour the fresh water into the salt water very carefully, and place an egg into the mixture? As I began preparing for this lesson, I was a little more nervous than I usually am.
I think I was just nervous about the I-CM. I was scared that my students were not going to talk about their investigations because they were not accustomed to this type of method. My main concern was that the students were not going to understand and discover the main concepts of the lesson. I really underestimated the knowledge of my students. I performed the experiment ahead of time, and everything worked out perfectly.
Now, it was time to see if my students could get it to work out perfectly. There was one aspect of this lesson that I felt extremely confident about and that was my preparation.
I wrote out everything that I planned to do for the lesson. I knew exactly what I was going to say. Next, I will give the students instructions for the next part of the experiment.
They will carefully add their fresh water colored blue to their salt water colored red using a teaspoon. The trick is that this has to be done very carefully, so that the two waters don't mix. Add the water by dribbling it along the side of the clear cup with a clean spoon. Students will write their predictions down about what they feel the egg will do when placed in the new mixture. Finally, we will gather again for a final colloquium to discuss what just happened and why it occurred.
Assessment: Assessment of the students will occur in several different ways. To begin, I listened and observed my students during class discussions and as they performed the experiment. I also looked at their predictions and factual recorded data to assess their understanding. Several students also had the chance to perform a creative drama. One student was the egg placed in fresh water, another was the egg placed in salt water, and a third student was an egg placed in the fresh and salt water mixture.
I also interviewed some students on their understanding of the scientific concepts. Students study denisty by combining salt water and fresh water, and water and oil.
It helps them to learn about density by comparing substances. When I started lab at Olgetree, my lab class was ending a unit on space and beginning a new unit on oceans and weather. After talking with my lab teacher, we decided that a hands-on experiment about salt and fresh water would be an interesting way for the students to begin a discussion concerning the oceans.
After researching several different experiments, I decided to introduce my students to "Egg Float". My biggest problem was deciding on an easy way to convey the concept of density to my students.
I found this very challenging, but decided that I could discuss density with them by using many examples. When you carefully add fresh water again, this fresh water is less dense than the salt water so it floats right on top! Are there other liquids you can add to make the egg sink or float? What else can you dissolve in the water to make the egg float?
Floating Egg What happens when you put an egg in a glass of regular water? Remove the egg and place it in the saltwater. The egg will float. Objects sink in liquids when their density is greater than that of the liquid. Conversely, objects float when the density of the liquid is greater than that of the object. An egg has greater density than plain water, so it sinks. Salt increases the density of water, however.
The denser the water, the easier it is for an egg or other object to float.
0コメント