Every helicopters can fly and if doesn't have wings. what is the counter example?

As a part of an experiment a student burns propane to produce carbon dioxide and water she remembers that she must follow the law conservation of matter when writing a balanced chemical equation which of these equation adheres to the law of conservation of matter

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

Draw a line graph showing the relationship between temperature in kelvin as a function of kinetic energy.