Explain reasons why

helium is used to fill balloon instead of hydrogen having a lighter weight

A 40.5 g block of an unknown metal is heated in a hot water bath to 100.0°C. When the block is placed in an insulated vessel containing 130.0 g of water at 25.0°C, the final temperature is 28.0°C. Determine the specific heat of the unknown metal.

What texture in igneous rock will result from magma cooling slowly? A. Vesicular. B. Course grained. C. Glassy D. Fine grained

A sample of pure iron has a mass of 5.00 g calculate its volume.

What is wosutah unsrcambled

At equilibrium the concentrations are as follows 1.4 10^-2 what is the value of keq for the reaction expressed in scientific notation

Given the reaction 2NaOH + H2SO4 = Na2SO4 + 2H2O, what is the total number of grams of NaOH needed to react completely with 196 grams of H2SO4

The mass flow rate of gasoline leaving a refinery is 1610 kg/min. The specific gravity of a gasoline is 0.700. A retail gasoline pump is able to fill a 20.0 gallon automobile tank in 1.80 minutes.

Calculate the solubility of cux (ksp=[cu2+][x2-]=1.27*10-36) in a solution that is 0.190 m in nacn.

An atom has seven valance electrons which element could have this type of atom

How is the ocean important to human survival? restate the question