18. when a chemical reaction takes place in an open system,
(a) can enter from the surroundings, but cannot escape to the surroundings
(b) can enter from or escape to the surroundings
(c) can escape to the surroundings, but not enter from the surroundings
(d) is not allowed to enter from or escape to the surroundings

For the following dehydrohalogenation (e2) reaction, draw the zaitsev product(s) resulting from elimination involving c3–c4 (i. e., the carbon atoms depicted with stereobonds). show the product stereochemistry clearly. if there is more than one organic product, both products may be drawn in the same box. ignore elimination involving c3 or c4 and any carbon atom other than c4 or c3.

Show how to convert the temperature 84.7° c to kelvin. include all steps and label the final answer

To separate a mixture of hard candies nd marbles the most efficient method would be