The compound with the chemical formula CF4, carbon tetrafluoride, is nonpolar. Unlike other molecules that are nonpolar because they feature only nonpolar bonds, CF4 has this property despite having four polar bonds in its structure.
The lack of polarity of CF4 is caused by the geometry of its molecule, which is tetrahedral, or pyramid-shaped. Although the bonds themselves are polar, the four bonds between carbon and fluorine cancel out one another, generating a nonpolar molecule. CH4, or methane, is the same as CF4 in this respect, as are many other molecules made of four halogens surrounding a carbon or silicon atom.Learn More
The thermal efficiency of a heat engine is a measure of performance that is done by taking the ratio of the amount of energy outputted to the amount of thermal energy inputted from a source, typically expressed as a percentage. For example, if you put 1000 Joules of energy in through fuel, but only get 500 Joules of energy out, then your thermal efficiency is 50 percent.Full Answer >
Isothermal expansion is an increase in the volume of a quantity of gas while the temperature stays the same. A constant temperature means that the volume of a gas is entirely dependent on pressure, which decreases as the size of the container increases.Full Answer >
When ice or any other solid melts, its potential energy increases. Indeed, this is the only increase in energy, since the thermal kinetic energy, or temperature, does not increase while melting. Potential energy is the latent energy that could be released by the water, and this increases because the water will release heat energy if it is frozen solid again.Full Answer >
Conduction is heat transfer through solid objects, while convection is heat transfer through liquid or gasses. Conduction and convection are both forms of radiation, which is heat transfer.Full Answer >