Which of these describes an endothermic reaction?

energy is released by the reaction.

energy is absorbed by the reaction.

no energy is transferred by the reaction.

energy is created in the reaction.

Which element would mostly likely have an electron affinity measuring closest to zero

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope