Use the drop-down menus to identify each type of galaxy pictured. Galaxy A:

Galaxy B:

Galaxy C:

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)

Type the correct answer in each box.balance the chemical equation.__ n203 ➡️ __ n2 +__ o2