We celebrated the last day of Science Club by making our own ice cream!!
The inside bag contains milk, sugar and vanilla. The inside bag goes in the outside bag along with some ice and salt. The whole setup goes inside a bin or bucket so you can shake it without freezing your hands off. When ice and water are placed in contact:
- Molecules on the surface of the ice escape into the water (melting)
- Molecules of water are captured on the surface of the ice (freezing)
The balance between freezing and melting can be maintained at 0°C, the melting point of water, but adding salt upsets the balance, lowering the freezing point. This makes the ice melt faster and you can enjoy your ice cream in 10-15 minutes!!
OK, today I pulled out all the stops! Not really. I pulled out all the batteries, bulbs, switches, wires, bells, alligator clips and motors that are in the science cabinet, so the students could explore circuits and electricity!
I will be attending the International Conference on Education next Thursday and Friday, May 22-23, but my afterschool classes will still be in session. Ileana and Molly have arranged for skilled NNMS staff to oversee these sessions.
Students are introduced to explorations into light and color in early grades,but it is important to continue giving these opportunities so they may develop an understanding of color as light waves are reflected, refracted, absorbed or transmitted through various materials.
NGSS Core Ideas: Electromagnetic Radiation
When light shines on an object, it is reflected, absorbed, or transmitted through the object, depending on the object’s material and the frequency (color) of the light.
The path that light travels can be traced as straight lines, except at surfaces between different transparent materials (e.g., air and water, air and glass) where the light path bends.
A wave model of light is useful for explaining brightness, color, and the frequency-dependent bending of light at a surface between media.
A simple pendulum consists of a weight, called a bob, attached to a string which is fixed at the other end. The pendulum has been used since the 16th century to measure time. Galileo was the first to observe its properties.
Rather than focusing on students memorizing what does and does not affect the period of a pendulum, I chose to have students focus on the process of science. During this activity students were making predictions, using prior knowledge and devising tests.