In the reaction H2 + N2 2 NH3, what coefficient should be placed in front of H2 to balance the reaction

What conclusion can you draw when you compare the density of the materials found on Earth's surface (.3000 kg/m3) with the density of Earth as a whole (0.5400 kg/m3) ?

Give the name of the "lightest" element (has atoms of lowest mass) in group 1a.

Which of the following gases will have the highest velocity at a given temperature? Ne O2 He Cl2

A glass cylinder contains four liquids in four separate layers. One liquid is water. Water's density is 1 g/mL. The purple liquid has a density of 1.62 m/mL. The yellow liquid has a density of 0.46 g/mL. The red liquid has a density of 0.91 g/mL.

Which elements can react to produce a molecular compound? (1) calcium and chlorine (2) hydrogen and sulfur (3) lithium and fluorine (4) magnesium and oxygen

The coefficients in a chemical reaction tells Select one: the masses, in grams, of all reactants and products. the number of atoms in the reactants.

Relationships in nature are besribed by

How are cations formed

A certain element forms an ion with 54 electrons and a charge of + 2. identify the element.

Which is a substance that could be found in air, water, or soil that is harmful to humans or animals?