https://padlet.com/mistyining/3B Experimental Design en-us 2017-03-23 00:54:33 UTC 2026-02-25 23:39:55 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Ninja.png mistyining https://padlet.com/mistyining/3B/wish/161999781 Write your names as the Title and then type out the Approach and Procedure.]]> 2017-03-23 01:07:26 UTC https://padlet.com/mistyining/3B/wish/161999781 https://padlet.com/mistyining/3B/wish/162677427 1. measure the mass of  the shell
2. add excess acid to the shell to dissolve all the calcium carbonate
. Filter the mixture and collect the residue
4. measure mass of residue using electronic balance
5. calculate percentage of calcium carbonate.
- (residue/initial mass)* 100
- take 100% - the percentage of residue]]> 2017-03-27 01:13:05 UTC https://padlet.com/mistyining/3B/wish/162677427 https://padlet.com/mistyining/3B/wish/162677503 Mass of reaction mixture
1. measure the mass of empty conical flask and cotton wool with electronic balance
2. add acid and place the shell beside the conical flask and measure the mass with an electronic balance. 
3. react the shell in a conical flask with excess acid and cover the mouth of conical flask with cotton wool.
4. when there is no more bubbling, measure the mass with electronic balance.
5. minus the mass of the conical flask and cotton wool from the final mass.
6. repeat steps 1-5 with the next shell.
7. compare the final masses. the shell with the larger mass has a higher percentage of calcium carbonate.]]> 2017-03-27 01:13:35 UTC https://padlet.com/mistyining/3B/wish/162677503 https://padlet.com/mistyining/3B/wish/162677511 Approach:
-React the shell(calcium carbonate) with excess acid.
-Measure the conical flask with the acid, the shell and the cotton wool.

Procedure: 
1- measure the conical flask with acid the shell and the cotton wool at the start of the experiment with an electronic balance.
2-place the shell into the excess acid and cover the flask with the cotton wool to prevent acid spray until no more effervescence.
3-measure the mass of the conical flask with the acid,salt and the unreacted shell using as electronic balance.
4-take the first calculated mass minus the second calculated mass to get the mass of carbon dioxide lost. thus the more the carbon dioxide is being lost the more the calcium carbonate is present in the shells. :)))))]]> 2017-03-27 01:13:39 UTC https://padlet.com/mistyining/3B/wish/162677511 https://padlet.com/mistyining/3B/wish/162677527 Procedure:
Mass of residue ( ﾟ_ゝﾟ) :
Step 1: Measure the mass of the shell with an electronic balance.
Step 2: Add the shell into excess acid until effervescence stops.
Step 3: Filter the mixture and collect the un-reacted shell residue.
Step 4: Measure the mass of the un-reacted shell using an electronic balance.
Step 5: Calculate the percentage of calcium carbonate with (mass of original shell) - (mass of un-reacted shell) / ( mass of original shell) x 100% = % of calcium carbonate.
Step 6: Compare the percentage of calcium carbonate in both shells and determine the shell with the higher percentage of calcium carbonate.
╚(•⌂•)╝]]> 2017-03-27 01:13:48 UTC https://padlet.com/mistyining/3B/wish/162677527 https://padlet.com/mistyining/3B/wish/162677540 Mass of residue:
Approach: 1) Measure mass of shell using electronic balance. 
                    2)React shell with excess acid to dissolve all calcium carbonate.  
Procedures: 1) Measure the mass of the the first shell using electronic 
                           balance. 
                       2) Pour excess acid into a conical flask. 
                       3) Add shell into the conical flask filled with acid until no                                effervescence is observed. 
                       4) Filter the mixture and collect the residue which is the 
                            leftover shell.
                        5)Measure the mass of the residue which is the leftover 
                            shell using an electronic balance. 
                        6) Repeat experiment with the second shell.
Processing data: 1) Take the original mass minus the mass of residue 
                                    to find the mass of carbonate in the shell.
                               2) Use the mass of carbonate over the original mass,
                                      x 100% 
                               3) Compare the two percentages with each other to 
                                     find out which shell has more percentage of       
carbonate. ]]> 2017-03-27 01:13:52 UTC https://padlet.com/mistyining/3B/wish/162677540 https://padlet.com/mistyining/3B/wish/162677549 Procedure:
1)label both shells as shell x and shell y
2) Measure mass of conical flask containing excess acid, and shell x using an electronic balance.
3) place the shell into the conical flask containing the excess acid
4) after the bubbling has stopped, measure the mass of the remaining reaction mixture in the conical flask using an electronic balance.
5) repeat steps 2 to 4 for shell y
6) compare the mass of reaction mixture for both shell x and shell y and the shell which has more remaining reaction mixture has less calcium carbonate]]> 2017-03-27 01:13:57 UTC https://padlet.com/mistyining/3B/wish/162677549 https://padlet.com/mistyining/3B/wish/162677595 Mass of residue
1) Measure mass of shell X using electronic balance
2) React the shell with excess acid untill all calcium carbonate dissolves and no more effervesence is produced
3) Filter the mixture and collect the residue
4) Measure the mass of residue using electronic balance.
5) Repeat steps 1-4 with shell Y
6) Compare the 2 masses. The shell with the larger mass has a higher percentage of CaCO3]]> 2017-03-27 01:14:17 UTC https://padlet.com/mistyining/3B/wish/162677595 https://padlet.com/mistyining/3B/wish/162677599 Volume of carbon dioxide
Approach: 
1) reaction between calcium carbonate and hydrochloric acid.
2)measure volume of carbon dioxide using measuring cylinder

Procedure:  
1) react the shell with excess hydrochloric acid in a conical flask
2) set up downward displacement of water experiment 
3) bubble the gas into a measuring cylinder using the delivery tube from the reaction tube.
4) measure the volume of carbon dioxide produced
5) repeat steps 1-4 using another mussel shell
6) compare the volume of gas produced between the two shells and determine which shell produced more carbon dioxide when reacted with acid.
7) the shell that produced more carbon dioxide from the reaction contains more calcium carbonate.]]> 2017-03-27 01:14:18 UTC https://padlet.com/mistyining/3B/wish/162677599 https://padlet.com/mistyining/3B/wish/162677615 Mass of residue
Approach:
 react shell w hydrochloric acid
 measure mass of residue 
Procedure: 
1) measure the mass of a shell using electronic balance
2)React shell with excess acid in a conical flask until bubbling stops
3)Filter the mixture
4) measure the mass of residue using an electronic balance
5)Repeat step 1-4 for the other shell
6)calculate the difference in the mass of unreacted shell and the original mass of both shells
7The shell with the bigger difference has more calcium carbonate.]]> 2017-03-27 01:14:25 UTC https://padlet.com/mistyining/3B/wish/162677615 https://padlet.com/mistyining/3B/wish/162677646 Mass of residue
Approach:  
Procedure:
1) React the shell by adding excess acid to the shell, and make sure  there is no more effervescence observed
2) Filter the reacted mixture with a filter paper and collect the residue which is 
3) Measure the mass of residue, calculate the percent
4)  Repeat steps 1 to 3 with the other shell
5]]> 2017-03-27 01:14:35 UTC https://padlet.com/mistyining/3B/wish/162677646 https://padlet.com/mistyining/3B/wish/162677650 Approach : Measure the mass of reaction mixture 
                    React the shells (calcium carbonate) with excess acid 
Procedure : 
1. Measure mass of flask containing acid ( HCl ) covered by              cotton wool and shell using electronic balance 
2.  Place shell into flask containing acid covered by cotton wool and wait until no more effervescence
3. Measure mass of reaction mixture when no more effervescence observed 
4. Repeat steps 1-3 with the other shell 
5. Take mass of unreacted mixture minus the mass of reaction mixture for both shells 
6. Determine which reaction mixture has a higher mass 
    The shell in reaction mixture with higher mass has more calcium carbonate  ]]> 2017-03-27 01:14:36 UTC https://padlet.com/mistyining/3B/wish/162677650 https://padlet.com/mistyining/3B/wish/162677651 Approach: React shell with excess acid and find the volume of carbon dioxide produced
Step 1: Measure the mass of the shell using an electronic balance
Step 2: In a conical flask, add excess acid to shells X
Step 3: Place a delivery tube into the conical flask, let the air escape from the delivery tube and conical flask and connect it to measuring cylinder in downward displacement set up.
Step 4: Measure the volume of the carbon dioxide produced.
Step 5: Repeat steps 1-4 for shell Y
Step 6: Compare the volume of carbon dioxide in the two measuring cylinder]]> 2017-03-27 01:14:36 UTC https://padlet.com/mistyining/3B/wish/162677651 https://padlet.com/mistyining/3B/wish/162677685 Approach for Finding mass of residue
1. Measure mass of shell using electronic balance
2. React shell with excess acid until no more bubbling
3. Filter mixture and collect the residue
4. Measure mass of residue, after drying it, using electronic balance
5. Calculate percentage using (mass of residue/ mass of initial shell )x 100%
6. Repeat steps 1-5 with other shell
7. Compare percentage of the mass of residue of each shell. The shell with the higher percentage of mass of residue has higher percentage of calcium carbonate.

]]> 2017-03-27 01:14:56 UTC https://padlet.com/mistyining/3B/wish/162677685 https://padlet.com/mistyining/3B/wish/162677699 Mass of residue
procedure
:
1)Measure mass of each shell at the start with electronic balance
2)react shell with excess acid until there is no more effervescence 
3)filter mixture to obtain unreacted shell 
4)measure mass of unreacted shell with electronic balance
5) repeat steps 2-4 with other shell
6)calculate percentage of unreacted shell : mass of unreacted shell/total mass of original shell x 100% 
7) compare percentage of both shells. The one with a higher percentage of unreacted shell has lower percentage of calcium carbonate]]> 2017-03-27 01:15:03 UTC https://padlet.com/mistyining/3B/wish/162677699 https://padlet.com/mistyining/3B/wish/162677718 Finding mass of residue 
Approach: 
Reaction  
Procedure: 
1. Measure mass of shell using electronic balance 
2. React shell with excess acid
3. Wait until effervescence stops 
4. Filter the mixture and collect the unreacted shell.
5. Dry the unreacted shell and measure its mass using electronic balance 
6. Repeat steps 2-4 with the other shell 
7. Measure difference in mass for each shell ( Original mass of shell - mass of shell after reaction)
Conclusion: The shell with the bigger mass difference has the higher percentage of calcium carbonate]]> 2017-03-27 01:15:12 UTC https://padlet.com/mistyining/3B/wish/162677718 https://padlet.com/mistyining/3B/wish/162677785 Mass of reaction mixture
Approach:
1) Measure the mass of the conical flask with acid in it using a electronic balance and with Shell X 
2) Put the Shell X into the beaker with the excess acid to ensure that all carbonate is dissolved
3) Measure the final mass of the whole set up using an electronic balance
4) Take the final mass - original mass divided by the original mass x 100% to find the amount of CaCO3 dissolved for Shell X 
5) Repeat steps 1 to 4 to find the percentage of CaCO3 dissolved for Shell Y
6) Compare the two percentages to see which Shell, X or Y, has a higher percentage of CaCO3

]]> 2017-03-27 01:15:44 UTC https://padlet.com/mistyining/3B/wish/162677785 https://padlet.com/mistyining/3B/wish/162677811 Mass of residue
 1) Measure mass of shell using electronic balance 
2)React shell in excess hydrochloric acid. 
3) effervescence will occur and wait till reaction is completed
4) filter the mixture and collect the remaining undissolved shell
5) Measure mass of remaining shell using an electronic balance 
6) mass of original shell - mass of undissolved shell over mass of original shell x100% = percentage of CaCO3 dissolved 
7) compare the two percentages to determine the shell that contains higher percentage of CaCO3 ]]> 2017-03-27 01:15:55 UTC https://padlet.com/mistyining/3B/wish/162677811 https://padlet.com/mistyining/3B/wish/162677989 mass of residue
1)measure the mass of the shells with an electronic balance.
2)add excess acid to the shells and let it react until effervescence stops.
3)filter the mixture to collect residue
4) measure the mass of the residue with an electronic balance
5)mass of shell at the start - mass of undissolved shell divided by mass of shell at the start x100% to find percentage of CaCO3 dissolved ]]> 2017-03-27 01:17:59 UTC https://padlet.com/mistyining/3B/wish/162677989