In class, we conducted a brief experiment in regards to lighter-than-air flying machines. The experiment involved an inflated helium balloon with a piece of string attached to the bottom.
I asked students why they thought a helium balloon was able to float in the air. They provided me with their best educated guesses.
Following this I added paper clips, 1 at a time, and attached them to the string on the end of the balloon. Eventually the balloon began to gradually get lower and lower as I added more paper clips.
I asked, "Why does the balloon get lower when I add the paper clips?".
The results of this experiment are to be explained for homework using scientific concepts that have been learned and taught.
Words that can be used in describing these results can be:
Density (more dense or less dense)
Air Pressure
Particles
Expansion
Contraction
Mass
States of Matter (solid, liquid, gas). A hint, the particles in a gas look very different and act very differently than the particles of a solid.
Student responses are due on Day 4 (Thursday).
Science- Pure Substances and Mixtures, Grade 7
Today we started to move beyond volume and matter and began to discuss one of the most important subjects in this unit. Today we learned about the difference between pure substances, mechanical mixtures and solutions.
Students were given a hand out which is expected to be completed for day 4 (Thursday)
Attached are links to 2 great videos that help children understand what pure substances and mixtures are. They also provide excellent examples of things that are classified as pure substances, solutions or mechanical mixtures.
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