Two chemicals react in an endothermic reaction. What can be known about this reaction? O The new substance will need more energy to form its chemical bonds than the old substance will release. O More energy will be released from the old substance than the new substance will need to form its chemical bonds. O A precipitate will form as a result of the reaction. O A gas will form as a result of the reaction.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

Ametal with a large number of free flowing electrons most likely has good conductivity