Why is HCF3 polar?

Why is Helium considered a stable element? Why is there no food chain without herbivores and carnivores? Why does undercooked kidney beans make you sick? Was our moon affected in any way when the meteor that killed the dinosaurs hit the Earth? Is uranium recyclable? What is the difference between the process of boiling and evaporation of water? When did a hurricane hit calfornia? Are there any vitamins that make the butt bigger? Is mt Kilimanjaro constructive or deconstructive? What is a complete culture solution? What is Oil coal and natural gas an example of? How are epidermal cell designed to perform protective function? Are beavers carnivores or omnivores? What is the body structure of a hookworm? What is the thickness compactness of molecules? How many protons neutrons and electrons are in a neutral atom with the symbol 41Ca? Would aloe vera help heal facial skin after laser resurfacing? How many cubic feet in 10 liters? What states don't recognize daylight Savin time? To manually move a system from one group to another you do which two things with the system to move it to the other group?