How many sigma bonds were formed from how many pi bonds in the diels-alder reaction lab? (5pts) did your test tube heat up after you added the cyclopentadiene to the dissolved maleic anhydride (ethyl acetate and hexane were the solvents)? why or why not would the test tube be hot, explain in detail? (15 pts) the diel-alder reaction is said to be "stereospecific." what does that mean in terms of product produced in the diels- alder lab? (15 pts) 5. what is an example of an aldol reaction? (10 pts)

How have the greenhouse gasses increased from the year 2000 to 2018

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

Find the number of moles of argon in 364g of argon.