Covalent compounds are typically molecular compounds, which are composed of molecules held together by covalent bonds. At room temperature, the state of a covalent compound depends on its molecular weight and intermolecular forces.

1. Gases: Covalent compounds with low molecular weights and weak intermolecular forces are usually gases at room temperature. For example, methane (CH4), ethane (C2H6), and carbon dioxide (CO2) are all gases at room temperature.

2. Liquids: Covalent compounds with intermediate molecular weights and moderate intermolecular forces are usually liquids at room temperature. Examples include ethanol (C2H5OH), acetone ((CH3)2CO), and chloroform (CHCl3).

3. Solids: Covalent compounds with high molecular weights and strong intermolecular forces are usually solids at room temperature. Examples include sugar (C12H22O11), table salt (NaCl), and diamond (C).

The physical state of a covalent compound can also be influenced by factors such as pressure and temperature. For example, water (H2O) is a liquid at room temperature and pressure, but it becomes a solid (ice) at lower temperatures or a gas (water vapor) at higher temperatures.