During a flood, the labels from three bottles of chemicals floated away. The unlabeled bottles of white solids were known to contain the following: barium nitrate, lithium sulfate, and ammonium chloride. Explain specifically (with each solution) how you could easily re-label these three bottles.
could easily re-label these three bottles.

Its strengthits conductivity of heat and electricity its shiny colourmalleable and ductility

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.