To read more...

The adventures of a science teacher in a small public middle school in the Bronx. Apologies to Joanna Cole and Bruce Degen, creators of the Magic School Bus series and the original Ms. Frizzle.
I'll venture a guess, but I won't be very precise with the details. It would have been easier if you had also bought eggs (the famous eggshell experiment).
As you bought both sugar cubes and extra fine sugar, I'm guessing you're going to work on solutions and mixtures. The fact that you bought different liquids might mean that you're going to work with different solvents.
Exp 1 : Use the same solvent (water) to time the dissolution of the same amount of sugar in cubes or fine. This could show that fine sugar dissolve more easily because it has more surface contact with solvent (I'm guessing that's a good enough explanation for middle school).
Exp 2: using the same amount of sugar, time the dissolution in different solvents (water, vinegar, cola, alcohol). This would show that different solvents dissolve the same thing at different rates. I'm not sure how far you would go in the scientific explanation of this.
She has been presented with the tremendously difficult task of teaching 7 middle schoolers to work cooperatively. To do so, she challenges them to create an accurate replica of Scooby Doo in less than nine minutes using only the following materials: a box of sugar cubes, a box of super-fine sugar, a bottle of rubbing alcohol, a bag of 50 plastic cups, and a box of 50 plastic spoons. Ten minutes later, she is faced with a semi-doglike structure, 7 grinning students and quite a mess from the 'glue' the team created by mixing rubbing alcohol and super-fine sugar. Being environmentally conscientious, she uses an entire bottle of white vinegar to clean up, and sits down to a well deserved meal: one of Annie's brand Indian microwave dinners and 3 bottles of Pepsi (she desperately needs that caffeine).
The memorable people for me represent that vast population of young and old of every hue and origin who gave up comforts and convention to answer their conscience, who are guided by their moral compass to difficult challenges and who are determined to make a difference. They lived in the real world and they took responsibility for it. They did not attach themselves simply to a virtual experience and find satisfaction in a search engine. They were boots on the ground, hands in the dirt, nights in scary places, healing and courageous. They stepped into the unknown and they made it more welcoming for the rest of us.
...These are difficult times. We are at war. And this war, as all wars are, is one freighted with mistakes and miscalculations, lethal consequences, highly charged emotions, defeats and successes. It is the debate in which we all have a say. I have a special place in my mind and in my heart for those who understand that patriotism is not a loyalty oath. I am never more proud to be an American than when a fellow citizen steps forward and says, "Can't we do better?"