Why are hydrogen molecules called elements but water molecules are called compounds?

How many chlorine atoms are needed to link up with one calcium atom

What compound has the strongest hydrogen bonding at STP? 1) H2O 2) H2S 3) H2Se 4) H2Te

Arrange the following atoms in order of increasing first ionization energy: He, Be, Se, Ne

If p = mv, what does v = ? (Solve for v)

The amount of silica in the magma and temperature are factors that determine the viscosity of magma.

The radius of a cobalt atom is 1.25 Å. What is its radius in meters (m) ?

Concentration is just one stress that can affect the equilibrium position. Another is temperature. Describe how you would design this experiment to test for the effects of temperature on equilibrium position.

Although DNA evidence cannot be obtained from hair evidence without a root, which of the following can be obtained from hair evidence?

Carbon naturally occurs in two forms: diamond and graphite. Why do these two forms have very different properties?

How many moles of hydrogen are evolved when an excess of sodium metal is added to one mole of citric acid?