3.4.3 Chemistry Lab

[lawson...@yahoo.com]

1. On the periodic table, what is a period?
A period is a row. Usually elements in the same period have the same number of electrons in the outer shell.
2. On the periodic table, what is a group?
A group is a vertical column known as a family. They mostly have similar physical or chemical properties of the outermost electron shells.
3.

[lawson...@yahoo.com]

On Monday, November 19, 2012 9:34:47 AM UTC-5, lawson...@yahoo.com wrote:
PRE LAB QUESTIONS AND ANSWERS. 1-3

> 3.Why are the radii changing as you move down the table within one column? Why are the radii changing as you move across the table from left to right within one row?
As you go down a column, row, or period the energy levels increase as the number of electrons increase as well. The atomic radius increase as the group and energy levels increase. As you go across a period electrons are added to the same energy level. There is a stronger force of attraction pulling the electrons closer to the nucleus resulting in a smaller atomic radius.

LAB QUESTIONS 1-4
1. Calculate and record the densities of the tin, silicon, and lead samples in data table 1.
2. Prepare a graph of density versus period number for tin, silicon, and lead.
3. Based on your graph, estimate the density of germanium, Ge. Compare your estimate with the accepted density of germanium (5.3 g/cm^3). Give possible sources of any errors.
4.Calculate the percent error between your estimated value and the accepted value for the density of germanium.

[dayrom...@gmail.com]

where are the answers ?