Which statement best describes pseudoscience? it is objective and backed by facts. it lacks a process for collecting data. it is constantly updated based on new information. it is closely analyzed before it is made known.

According to le chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress. normalizes the stress. increases the stress. changes the stress.

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

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)