Polarity and Boiling Point: The polarity of the molecules determines the forces of attraction between the molecules in the liquid state. Polar molecules are attracted by the opposite charge effect (the positive end of one molecule is attracted to the negative end of another molecule.
The five disadvantages of solar power. It's intermittent. Solar energy is only available when the sun is shining. It's low efficiency. It requires large areas of land. It's not completely free of environmental impact. Ultrapure polysilicon is now scarce. It's high cost.
Solar Energy Pros and Cons. Solar energy is the energy from the sun. Solar panels use sunlight to produce electricity. These panels are normally mounted on the roof and angled to face the sun. Countries all around the world are using solar energy to reduce their dependance on fossil fuels and making it as a sizable share of their energy supply.