Marcel conducts an experiment to test which stain remover works best on mustard stains. he wants to make sure that he does not make mistakes and has correct data in his experiment.

what should marcel do to make sure that his data are correct?

conduct a similar experiment with a different washing machine
ask other students to conduct related experiments at their homes
ask his sibling to conduct the same experiment using his washing machine
repeat the experiment several times with the same variable and constants

Ithink is d. physical property

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. 

The correct answer is c. orbital shape. "the angular momentum quantum number l describes the shape of an orbital. it corresponds to each orbital type, i.e. (0,1,2,−1)=(s,p,d,f,g,"