Stoichiometry Lab
By Amy Shan
starstarstarstarstarstarstarstarstarstar
Last updated almost 3 years ago
12 Questions
Note from the author:
This is a virutal lab used during online learning.
1 point
1
Question 1
1.
Watch the video for this lab in the folder in Schoology. Read the procedure for the lab.
Did you watch the video and read the procedure?
Watch the video for this lab in the folder in Schoology. Read the procedure for the lab.
Did you watch the video and read the procedure?
1 point
1
Question 2
2.
What is the mass of the crushed tablet in grams? Get the mass from the video. Write a number and an unit.
What is the mass of the crushed tablet in grams? Get the mass from the video. Write a number and an unit.
1 point
1
Question 3
3.
What is the mass of the beaker and HCl in grams? Get the mass from the video. Write a number and an unit.
What is the mass of the beaker and HCl in grams? Get the mass from the video. Write a number and an unit.
1 point
1
Question 4
4.
What is the total mass of the tablet, beaker and HCl? Write a number and a unit. Record your answer to 4 sig figs.
What is the total mass of the tablet, beaker and HCl? Write a number and a unit. Record your answer to 4 sig figs.
1 point
1
Question 5
5.
After the reaction, the mass of the beaker is taken again. Get this mass from the video. This is the mass of the tablet, acid, and beaker with the CO2 removed.
Write a number and a unit.
After the reaction, the mass of the beaker is taken again. Get this mass from the video. This is the mass of the tablet, acid, and beaker with the CO2 removed.
Write a number and a unit.
1 point
1
Question 6
6.
What is the mass of CO2 that was lost (escaped) in this reaction? You need to do a calcuation here.
Write you answer, unit, and compound. Recprd your answer to 2 sig figs.
What is the mass of CO2 that was lost (escaped) in this reaction? You need to do a calcuation here.
Write you answer, unit, and compound. Recprd your answer to 2 sig figs.
1 point
1
Question 7
7.
Using the mass of CO2 lost in the experiment, calculate the mass of calcium carbonate in the tablet.
Hint: DO STOICH! Use the balanced chemical reaction on the first page of this lab.
Write you answer, unit, and compound. Recprd your answer to 2 sig figs.
This calculation is the actual amount of reactant, because it is determined by the experiment.
Using the mass of CO2 lost in the experiment, calculate the mass of calcium carbonate in the tablet.
Hint: DO STOICH!
Use the balanced chemical reaction on the first page of this lab.
Write you answer, unit, and compound. Recprd your answer to 2 sig figs.
This calculation is the actual amount of reactant, because it is determined by the experiment.
1 point
1
Question 8
8.
Now, that you got the correct answer for Problem #7, show your work here. You must show your set-up, your given, and ALL of your fraction-style conversion factors. DO NOT make up abbreviations for units. If you don't know the proper abbreviation, write out the entire word.You may write your answer using the drawing tools below OR you may take a picture of your paper and upload it. Your Choice! PLEASE make your answer easy for your teacher to read!
Now, that you got the correct answer for Problem #7, show your work here. You must show your set-up, your given, and ALL of your fraction-style conversion factors. DO NOT make up abbreviations for units. If you don't know the proper abbreviation, write out the entire word.
You may write your answer using the drawing tools below OR you may take a picture of your paper and upload it. Your Choice! PLEASE make your answer easy for your teacher to read!
1 point
1
Question 9
9.
The label says that each tablet contains 0.808 grams of CaCO3.
This value is the theoretical amount of reactant because it is using data that resulted from a calculation or reference material.
Now, calculate the percent yield of your experiment. Round your answer to 2 sig figs. Remember, your unit!
The label says that each tablet contains 0.808 grams of CaCO3.
This value is the theoretical amount of reactant because it is using data that resulted from a calculation or reference material.
Now, calculate the percent yield of your experiment. Round your answer to 2 sig figs. Remember, your unit!
1 point
1
Question 10
10.
Show your work on how you got your answer in #9.
Show your work on how you got your answer in #9.
1 point
1
Question 11
11.
Why does the total mass decrease after the chemical reaction?
Why does the total mass decrease after the chemical reaction?
1 point
1
Question 12
12.
Evaluate this experiment. Why did we NOT get 100% yield? Is 100% yield realistic in a lab? What are some reasons that you would not get 100% yield in an experiment. Write several complete sentences of your analysis.
Should we be pleased with a percent yield in the high 90s?
Evaluate this experiment. Why did we NOT get 100% yield? Is 100% yield realistic in a lab? What are some reasons that you would not get 100% yield in an experiment. Write several complete sentences of your analysis.
Should we be pleased with a percent yield in the high 90s?