You have two balloons of equal volume at room temperature and 1 atm pressure. One balloon is filled with He and the other is filled with H2. Which statement is true about the relative number of gas particles in the two balloons? 1. Both balloons

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)