Do you know the gas laws?

Substances that consist of low-molecular-weight nonpolar covalent molecules can exist as gases at very ______ temperatures. Similar substances that have higher molecular weights have condensation temperatures somewhat________ room temperature. The condensation temperature of ammonia is much higher than that of methane because the molecule of ammonia is _______. Ionic compounds, covalent network substances, and metals have condensation temperatures that are all _____.