Final answer:
Carbon tetrachloride has the formula CCl4. It is a chemical compound composed of one carbon atom and four chlorine atoms, previously used as a solvent and in fire extinguishers.
Step-by-step explanation:
The formula for carbon tetrachloride is CCl4. It is a compound that consists of one carbon atom and four chlorine atoms. The prefix 'tetra' in the name indicates that there are four chlorine atoms attached to the carbon atom. Carbon tetrachloride is a nonpolar molecule and was widely used as a dry cleaning solvent, as well as in fire extinguishers, until its use was regulated due to its harmful environmental and health effects.