Chalk Lab Honors
Chalk is calcium carbonate. In this lab you will write on the sidewalk with a piece of
chalk & calculate how many moles are now stuck to the sidewalk.
Procedure:
1. Take a piece of chalk and measure its mass on the balance; record the mass in the
data table.
2. Go outside and draw something on the sidewalk.
3. Go back in class and weigh the unused chalk; record the mass in the data table.
4. Based on the initial mass of the chalk and the mass at the end, calculate how many
grams of chalk you left out on the sidewalk (final- initial mass).
5. Write down the chemical formula of the chalk; chalk is a compound formed when
calcium and carbonate ions combine.
6. Calculate the chalk’s molar mass. YOU MUST USE DIMENSIONAL ANALYSIS.
SHOW ALL YOUR WORK.
Data table:
******Copy into your lab notebook:
Mass of chalk before writing
Mass of chalk after writing
Mass of chalk on the sidewalk
Chemical Formula of Chalk
Molar Mass of Chalk
Analysis/ Conclusion:
Using this data, calculate: SHOW ALL WORK TO RECEIVE CREDIT!!!!
1. Show the calculations used to obtain the molar mass of chalk.
2. Calculate the number of moles of chalk used.
3. How many units (RPs) of manganese (IV) sulfate are there if you are given 542.32 g?
4. How many moles of magnesium oxide are in 8.25 x 1024 representative particles?
5. What is the mass of potassium chloride in 4.25 x 1023 representative particles?
Chalk Lab Regular
Chalk is calcium carbonate. In this lab you will write on the sidewalk with a
piece of chalk & determine how moles are now stuck to the sidewalk.
Procedure:
1. Take a piece of chalk and measure its mass on the balance; record the mass in the
data table.
2. Go outside and draw something on the sidewalk.
3. Go back in class and weigh the unused chalk; record the mass in the data table.
4. Based on the initial mass of the chalk and the mass at the end, calculate how many
grams of chalk you left out on the sidewalk (final- initial mass).
5. Write down the chemical formula of the chalk; chalk is made when calcium and
carbonate combine.
6. Calculate the chalk’s molar mass.
Data table:
Copy into your lab notebook
Mass of chalk before writing
Mass of chalk after writing
Mass of chalk on the sidewalk
Chemical Formula of Chalk
Molar Mass of Chalk
Analysis/ Conclusion:
Using this data, calculate: SHOW ALL WORK TO RECEIVE CREDIT!!!!
1. Show the calculations used to obtain the molar mass of chalk.
2. How many moles of calcium carbonate are lying on the sidewalk?
3. How many moles of silver sulfate [Ag2(SO4)] are there if you have 82.32 g?
4. How many grams of magnesium oxide exist in 6.274 moles?
5. How many grams are in a compound of iron (III) sulfate if you are given 72.3 moles?