Bubble Gum, Mole, and Both Hydrate Labs

The Bubble Gum Lab is really the PERCENT COMPOSITION by MASS OF SUGAR in Bubble Gum.  It’s chemistry math, not chewing gum stuff.

The formula in question here is the percent comp by mass formula on the back of the reference table.

It’s the mass of the part we’re looking at (the sugar only) divided by the whole mass (the mass of the un-chewed gum) multiplied by 100%.  That will tell you the percent of the gum by mass that is sugar.  It’s a gross number, as gum is about 72% sugar and only 18% “pink” indigestible stuff.

The Mole lab is all about moles, and the mole math outlined with the shark and the islands.  Figure out where you are going to start (over 1) and follow the bridges and stay on the islands.  Watch SF!  Use units.

Copper (II) sulfate pentahydrate has five water molecules “loosely’ bonded to it, and they will evaporate away upon heating.  We are measuring 3.00 grams out, doing the molar mass and the percent comp by mass of the water.  Then we’ll see if the expected percent mass evaporates away.  It should.

With the Epsom salt, or magnesium sulfate hepthydrate lab, it’s the same deal with a different compound and a different percentage of water.  It’s more of a seal the deal and make sure you get it lab.

Lots of labs, lots of learning, and it’s all good.  We had 360 lab minutes previously, and now we have gum (40), Moles (40), Copper (80) and the magnesium lab (40 more), soon you will be up to 560 lab minutes.  That’s almost half way to the required 1200 for the year.

Hand in your lab reports after they are graded.  They go into the cardboard box marked completed lab reports.  I must collect them.