Test tube of ammonium chloride (NH4Cl) being heated over a bunsen burner flame. Ammonium chloride decomposes readily when heated, but condenses in the cooler area at the top of the test tube. This is a reversible reaction, where the ammonium chloride decomposes into the gases ammonia (NH3) and hydrogen chloride (HCl).
This isn't a good question but I guess!
Answer:
d) They're studying something for which they cant do an experiment
Explanation:
Answer:
different sizes of the parachute
Explanation:
this is what is being changed throughout the experiment
