EDTL：3165 Shirley‘s Blog

  Question #1 What are the approximate melting points of the substances B and E? Melting Points for B = 350° C, for E = 1200° C. Question #2 This model can simulate a substance that does not have a melting point. Find that substance and click  Take snapshot  to show what substance it is. Describe why it does not have a boiling point, and how you know that it doesn't. (You can use the drawing tool for your answer.) Question #3 Make up a rule that describes how boiling point changes with the strength of particle attraction. Use evidence from the model to justify your rule. The boiling point gets higher when there is a stronger particle attraction. Question #4 What additional questions do you have about this model? How do you tell the melting point vs the boiling point.

  We propose why substances have different densities, because some substances are filled with tiny pores, while others do not have or have a small number of pores inside, resulting in differences. That's why they have different densities. We also observed the diffusion rate and color range of M&M beans in water of two different colors, blue and orange. Compared to ordinary water, the use of sugar water actually seems to have a similar diffusion effect

 This week, we measured the quality, float and sink status, weight, and so on of various materials, including wood, crayons, straws, tin foil balls, and glass marbles. We drew many tables to record each item, which I found very interesting and participatory. Children will love to participate in it. I have also learned this knowledge before, but using these methods to practice also reflects the intuitive recording of various tables

  We placed two pieces of ice of the same size in an iron bowl and on a wooden board, and finally saw a rapid melting in the iron bowl, but a slow melting on the wooden board. This is because the material of the iron bowl reacts with ice, ultimately causing the ice to melt quickly. We put M&M beans in water, and the food coloring on the outer shell of M&M beans slowly disperses in the water. By moving the M&M beans in the water with our hands, we can see a more noticeable color melting. When we suck the leather strap onto the cardboard, it bounces back quickly, but when we suck it onto the table, it doesn't bounce back. Cardboard brings air. Let the air inside expand, causing rebound. We put two spoonfuls of white vinegar in a bag, and half a spoonful of baking powder in the same bag. When the baking powder comes into contact with the white vinegar, they react and start boiling, creating many bubbles and cooling. We put sugar free and normal cola in water, and in the en...