Models of the Atom

Chapter 3 began with a historical study of how early chemists used experimentation and reasoning to assemble models of the atom.  The Lesson 11 PowerPoint provides key vocabulary around the components of the atom (proton, electron, neutron, and nucleus).  In addition, we previewed the content in Lesson 12, introducing the concept of atomic mass (to go with atomic number) and noticing that by subtracting atomic number (the number of protons in an atom) from atomic mass (the sum of an atom’s protons and neutrons), we can calculate the number of neutrons in the nucleus of an atom.

To go along with the Lesson 11 Worksheet, students also received a handout explaining the five models of the atom.  For homework, students should complete questions 1-4 and 7-9 from the end of Lesson 11 in the textbook.

Initial Model of the Cell

For our first lesson of our new unit, students were tasked with drawing an initial model of a cell.  They used the white boards on their desks to draw cells as they understand them, including the parts of cells (organelles).  Students shared out what types of cells they had drawn and what parts they could remember.  An example of student work is pictured below.

Next, we watched the Harvard BioVisions video Inner Life of a Cell, which presents a realistic animation of how cells move.

We concluded the lesson with students reading Chapter 1 of Inside the Cell.  The “Got It” questions on page 19 are due tomorrow by the end of class.  For homework, students are encouraged to read as much of Chapter 1 as necessary to be able to complete the reading in class tomorrow.