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Science - 2nd Grade
Standard 1 Objective 1
1 class periods of 60 minutes each
Students work together as a class to generate a science fair project. The students use the steps of the scientific method to ask a question, form a hypothesis, design a test, collect data, and draw conclusions. Their findings are presented to the class and placed on a science fair project board for the school science fair. The topic of this project is to find out what happens to the circumference of a balloon when it is placed in dry ice, kept at room temperature and when it is warmed by a hair dryer.
When soccer balls and basketballs are left out in the cold they go flat. When the gas in a balloon is cold, the molecules have less energy, move more slowly and don't collide as hard or as often with the side of the ball. The ball decreases slightly in size and it becomes flat. When the gas in a balloon is hot the molecules have more energy, move more quickly and collide hard against the side of the ball, this causes the ball to swell. A ball that is firm will bounce higher. Therefore, a gas that is cooled will contract and the balloon becomes smaller, while a gas that is heated will expand and the balloon becomes larger. This explains why a hot air balloon rises.
Pre-lab Discussion: Bounce a basketball that is flat on the ground. Ask the students why it doesnt bounce back very well. Have students predict when a ball becomes flat more often: summer or winter. Discuss why that may be the case and begin a discussion on gases and how the volume of a gas changes with temperature. Discuss with the students what a science fair is and tell them that they will complete a science fair project today in the classroom.
I. Experiment: Complete the experiment first and then work on writing the assigned sections for the project board.
II. Science fair display board: Assign each group a different section of the class science fair display board. Each group can decide what to write and then help the students take turns writing the different words on a half sheet of paper. Students will write up their section and then place it in the appropriate area on the display board. If you take pictures of the students working on the project you can put them on the board as well.
|Left Panel||Center Panel||Right Panel|
|Why we did the project||Title||What we learned|
|What we think will happen||Tables, pictures|
|How we did our project||drawings||Name of teacher|
Rio Tinto Hands-on Science Curriculum Team