What is the molar mass of a gas that takes three times longer to effuse than helium?

About what percent of US land is within the Mississippi River watershed?

Selina drops a golf ball down a deep well. The ball falls with only the force of gravity acting on it. Without any air resistance, as the golf ball falls into the well, its acceleration is: A. constant B. increasing C. decreasing D. changing

Which statement is true? A) Kinetic energy becomes potential energy in chemical reactions. B) Matter can be created or destroyed, but energy cannot. C) Matter and energy are conserved in chemical reactions.

Can anyone tell me about sulfuric acid in shampoo/soap?

I need an Honest answer ... and I also didnt know where to post this question under. This is bothering me a lot so I'd appreciate a real answer.

What is the Celsius equivalent of 212°f

Identify the characteristics of tornadoes and hurricanes

When magma intrudes parallel to another rock layer, the formation is called a (n) A. sill. B. dike. C. extrusion. D. unconformity.

What is the net amount of energy released when 1 mole of H2O is produced

Why is Sn (SO4) 2 named Tin (IV) Sulfate and not Tin (II) Sulfate?