Ca(s)+mgso4(aq)-> caso4(aq)+mg
bacl2(aq)+k2so4(aq)-> baso4(s)+2kcl
rewrite each reaction as a balanced net ionic equation.

First equation

1) Write the balanced equation

Ca(s)+MgSO4(AQ)->CaSO4(aq)+Mg

2) Write the ionic equatin showing the oxidation states (charges), next to each ion

Ca (0) + Mg (2+) + SO4 (2-) ---> Ca (2+) + SO4 (2-) + Mg (0)

3) Remove the spectator ions (those that appear exactly the same at both sides). In this case remove SO4 (2-) from both sides to get:

Net ionic equation
Ca(0) + Mg(2+) ---> Ca(2+) + Mg(0)

Now go with the second equation

1) Write the balanced equation

BaCl2(aq)+K2SO4(aq)->BaSO4(s)+2KCl

2) Write the ionic equation

Ba (2+) + 2Cl (1-) + 2K (1+) +SO4 (2-) ---> Ba(2+) + SO4 (2-) + 2 K(1+) + 2Cl(1-)

3) Remove the spectator ions.

Here all the ions are spectator, because non of them changed the oxidation state. Then,  there is not net ionic equation.


 

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. 

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