Today students began an Investigation into Atoms, Molecules, Elements, Compounds, and Moles.
Our ESSENTIAL QUESTION for this investigation is, "How is Matter organized in the Universe?"
Our focus today was, "How can we count the particles of matter?"
Students began their investigation by measuring out 18g of water in a graduated cylinder using the triple beam balance. They then modeled this by drawing their observations.
Students then tried to figure out a way to count all of the water molecules in their 18g sample. We then determined as a whole group that the number of molecules must directly relate to the mass in some way but we were unsure of exactly how.
Students then made a prediction/guesstimate of how many water molecules they believed made up their 18g sample. I saw guesstimates from 18 to 18 million! I then asked students to model one molecule of water to the best of their ability. This completed the work expected on page 95 of the ISN.
We then watched a BrainPop 5 minute movie on MOLES. Students discovered in the movie that one Mole of water is exactly 18 grams, i.e., the amount they measured out.
We then discussed how one Mole is equal to 6.02 x 10 to the 23rd power (Avogadro's Number). To their great surprise this meant that there are this many molecules of water in their 18g sample:
THAT IS A LOT OF MOLECULES!
Students were shocked to find out how many molecules of water were in their tiny sample and this really drove home the point of how small molecules (and atoms) truly are.
Students are to create a creative output on page 94 (NOT 96 like I listed in class -oops sorry!) based on the following:
6.02 x 10 to the 23rd power
This creative output MUST include the actual number written out in its entirety. I have posted what my version of the creative output looks like. If students create a document like this they should print it out in black and white and add color to it by hand. All creative outputs should take them at least 5 minutes but no more than 15 minutes. Creative outputs MUST always use color!
Mrs. Batt is the 7th grade Life Science teacher at Hawthorne Middle School.