Question 23 Which of the following are true statements:
I. atoms are mostly empty space
II. Calcium is in Alkali family
III. Hydrogen is only metal on nonmetal side
IV. Osmium is a transition metal
VI. Gallium is a metalldid (semi-metal)

Engineers have contribute to society in many ways like making the technology we use today or any type of power energy material

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.