Stoichiometry Name
Use the correct significant figures, units and include a set-up of the problems.
1. A hydrate of calcium sulfate Al2(SO4)3?H2O is gently heated and the water is driven off.
The following measurements were written down during the lab:
Mass of crucible
21.426 g
Mass of hydrate with crucible
22.020 g
Mass of heated crystal and crucible
21.939 g
Determine the value of the question mark above in front of the water.
Tell how to make sure all of the water is driven off the crystal.

Which equation represents a fission reaction? o "9n+h—150 o 235u + n—190cs + rb+25 o be + he—1c + in o 28 np —> 2390 pute

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н, о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

Define dew point. i am writing this part to be able to ask the question