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In this lab, you will be working with a chemical you can actually touch (and a lot of the time you want to eat it). The chemical is called sucrose (the chemical formula is C12H22O11) but we call it "table sugar or simply sugar". It is actually a group of atoms we call a molecular compound where (due to the elements Electronegativity differences) the elements share their valence electrons. In this lab, we will make pretend that sucrose is not a molecular compound but an element (so be quiet about this and don't tell anyone OK).
Objective:To investigate how to determine the mass and or numbers of sucrose "particle or crystals" using our lab triple beam balances (Centogram scales).
Note: In this lab, you will break the rules about weighing chemicals and will be allowed to place chemical directly on the weighing pan on the balance. MOST labs, that is not allowed since chemicals can react with the chemicals that make up the pan.
Get into groups of 3, if need one group of 4. You will be handing in 1 piece of paper for the group so make sure all member's name (and your period) is one paper.
1. Open the sucrose package carefully and make observations of the sugar crystals. Be careful not to lose any of the crystals.
2. Using a toothpick, wooden stirrer or tweezers , place 1 crystal of sugar on the balance and weigh the crystal. If 1 crystal does not affect the balance, then how many crystals does it take to make the balance move?
3. Clear the pan of sugar and then add sugar crystals until you have massed out 3.410g of the crystals (again for this lab you do not need to use a piece of weighing paper).
4. Being very careful not to lose any sugar crystals, pour the crystals out on your desk top (which is black and should help in seeing the crystals).
5. Count all the crystals that you weighed to get 3.410g. DO NOT LOSE ANY CRYSTALS AND YOU MUST COUNT EVERY CRYSTAL NO GROUPING OF CRYSTALS.
Group Member's Names:
Observations of sugar crystal:
Mass of 1 sugar crystal (g) :
If 1 crystal can be weighed, how many crystal did you weigh:
Mass of those number of crystals:
Number of crystals in the 3.410g sample (use scientific notation if it is above 1000.):