Which of the following statements is NOT true? A. Covalent compounds are often gases or liquids.
B. Covalent bonds occur between nonmetals.
C. Covalent compounds have low melting and boiling points.
D. Covalent bonds between atoms of a compound are relatively weak compared to bonds between molecules.

Based on its chemical properties, identify the position of each chemical family on the periodic table.

Consider the following reaction at equilibrium. 2co2 (g) 2co (g) + o2 (g) h° = -514 kj le châtelier's principle predicts that the equilibrium partial pressure of co (g) can be maximized by carrying out the reaction a. at high temperature and high pressure b. at high temperature and low pressure c. at low temperature and low pressure d. at low temperature and high pressure e. in the presence of solid carbon

At 20°c, a sample of h2o liquid and a sample of co2 gas each have the same average kinetic energy. why is one a liquid and the other a gas at this temperature?