Is nitrogen gas a pure substance or a mixture

Which set of coefficients will balance this chemical equation? __PbS (s) + __O2 (g) → 2PbO (s) + 2SO2 (g)

What are two types of a behavioral adaptation

A car travels a total of 10,000 meters.

If you breathe normally you have about 0.11 moles of air in your lungs and a volume of 2.4 L. If you then take a deep breath all the way, you will have 0.27 moles of air in your lungs. How big will your lungs be?

Our Earth cycles through day and night regularly. This cycle allows us to have a way to keep track of time and schedule our daily lives. Most of our activities and interactions occur during the day and most of our sleeping occurs at night.

Charles's law states that

If 30mL of 0.5M KOH is needed to neutralize 2M HCl, what was the volume of the acid?

A ratio wave travels 186,000 miles per second. How many kilometers will the wave travel in one microsecond? (1 mile=1.61 km)

Pb (BO2) 2 chemical name

What is Flocculation