1. Indicate which of the following unbalanced equations represents a redox reaction.
a- SO, + H2O + H2SO.
b- 1,0, + CO - I2 + CO2

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here