The chart below shows the crystal shapes and melting points of two forms of solid phosphorus.

Which diagram represents the potential energy changes during an exothermic reaction?

Given the equation representing a chemical reaction at equilibrium in a sealed, rigid container:H2(

A solid sample of a compound and a liquid sample of the same compound are each tested for electrical

Given the formula representing a molecule:Which statement explains why the molecule is nonpolar?

A student measures the mass and volume of a sample of copper at room temperature and 101.3 kPa. The

Some information about the two naturally occurring isotopes of gallium is given in the table below.

What occurs when a catalyst is added to a chemical reaction?

In chemical reactions, the difference between the potential energy of the products and the potential

When a reversible reaction is at equilibrium, the concentration of products and the concentration of