The volume of a sealed helium balloon is 9 L at 20°C (cool room temperature). What will be the balloon's volume at 70°C (a hot Texas afternoon?

If 34.2 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 299 kelvin and 1.21 atmospheres? 2 li (s) + 2 h2o (l) yields 2 lioh (aq) + h2 (g)

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Name the element in group 17, period 2. (periodic table)