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` ╫>pы 0 8 ╫>аы < ╤ха╫>╨ы @ ╫>Ёы 0 Lab: Determining Trends in a Group
Introduction
This investigation examines a periodic trend. In particular, the density of a group of elements will be examined and the information about the known elements will be extrapolated to predict the densities of family members not
measured in the lab directly.
MATERIALS
10 mL graduated cylinders
small beakers for weighing
lead shot (Pb)
silicon pieces (Si)
tin pieces (Sn)
electronic balance
Procedure
1. Measure out a sample of the element. The samples should be at least 2.0 g of silicon and at least 5.0 g for the tin.. Be sure to account for the mass of the beaker when measuring your element.
2. Record the mass of the element in your data table.
3. Pour about 6 mL of water into the graduated cylinder. Record the actual initial volume in your data table.
4. Add the element sample to the water in the cylinder. Gently tap the side of the cylinder to release any trapped air bubbles. Record the final volume in your data table.
5. Carefully pour off the water, collect the wet pieces on a paper towel and set the sample out to dry.
6. Repeat steps 2 through 5 for the remaining two element samples.
7. Calculate the density of each element by dividing the mass of each sample by the volume displaced by each sample. Record the value.
8. Using graphical analysis, construct a graph of density (y-axis) vs. atomic number (x-axis).
Data
MEASUREMENTSILICON (Si)TIN (Sn)LEAD (Pb)mass of beaker empty (g)
mass of beaker with element (g)mass of element (g)
initial volume of water (mL)final volume of water + element (mL)volume of element (mL)
density of element (g/mL)
Calculations
1. Show your density calculations here:
Analysis
1. Which sample has the greatest volume?
2. How does the density change going down the group?
3. Using your graph to estimate the density of germanium (atomic number 32) and carbon (atomic number 6).
4. Look up the actual densities of the elements. Calculate the percent errors in your densities.
WRITE A CONCLUSION
PERIODIC BEHAVIOR Name: _______________________
Partner #1: _______________________
Partner #2: _______________________
Acton-Boxborough Regional High School Due Date: ______________________
Acton-Boxborough Regional High School
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x V ; V Ф Ф Ф Ф Ф ╘ ╘ ╘ & С X щ ~ ; ▐ ╘ Ф @ ╘ ╘ ╘ ; ╘ ▐ ▐ Ф Ф ╘ ╘ ╘ ╘ ▐ Ф ▐ Ф 6 ▐ ▐ ▐ ▐ ╘ ╘ ? ╘ Lab: Determining Trends in a Group
Introduction
This investigation examines a periodic trend. In particular, the density of a group of elements will be examined and the information about the known elements will be extrapolated to predict the densities of family members not
measured in the lab directly.
MATERIALS
10 mL graduated cylinders
small beakers for weighing
lead shot (Pb)
silicon pieces (Si)
tin pieces (Sn)
electronic balance
Procedure
1. Measure out a sample of the element. The samples should be at least 2.0 g of silicon and at least 5.0 g for the tin.. Be sure to account for the mass of the beaker when measuring your element.
2. Record the mass of the element in your data table.
3. Pour about 6 mL of water into the graduated cylinder. Record the actual initial volume in your data table.
4. Add the element sample to the water in the cylinder. Gently tap the side of the cylinder to release any trapped air bubbles. Record the final volume in your data table.
5. Carefully pour off the water, collect the wet pieces on a paper towel and set the sample out to dry.
6. Repeat steps 2 through 5 for the remaining two element samples.
7. Calculate the density of each element by dividing the mass of each sample by the volume displaced by each sample. Record the value.
8. Using graphical analysis, construct a graph of density (y-axis) vs. atomic number (x-axis).
Data
MEASUREMENTSILICON (Si)TIN (Sn)LEAD (Pb)mass of beaker empty (g)
mass of beaker with element (g)mass of element (g)
initial volume of water (mL)final volume of water + element (mL)volume of element (mL)
density of element (g/mL)
Calculations
1. Show your density calculations here:
Analysis
1. Which sample has the greatest volume?
2. How does the density change going down the group?
3. Using your graph to estimate the density of germanium (atomic number 32) and carbon (atomic number 6).
4. Look up the actual densities of the elements. Calculate the percent errors in your densities.
WRITE A CONCLUSION
PERIODIC BEHAVIOR Name: _______________________
Partner #1: _______________________
Partner #2: _______________________
Acton-Boxborough Regional High School Due Date: ______________________
Acton-Boxborough Regional High School
О Щ
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жазаи╨й╨| H H ┌( с с∙EG(№ H H ┌( d ' ` Р 0 0 & t· a0 `0 ( 0 0 & №∙Н ┘ ╪ 0 0 & №∙б ┘ ╪ 0 0 & №∙Н ┘ ╪ 0 0 & №∙М ┘ ╪ 0 0 & №∙О ┘ ╪ CE="HELVETICA,ARIAL" SIZE="-2" COLOR="FFFFFF">Team Pages