PLEASE HELP
1. Why should Helium have been used to fill the Hindenburg instead of Hydrogen?

Select the correct answer how does the heat content of the reaction change in the process of photosynthesis when a glucose molecule is formed? ca the value of is negative the value of qis positive the value of a remains constant the value of a decreases the value of equals zero e

How many moles of sulfur dioxide are produced when 4.38 moles of oxygen completely react with iron (iv) sulfide

Maya wrote if you step to describe how carbon circulates between the atmosphere and living organisms