When the mineral dolomite (caco3·mgco3) is heated, it gives off carbon dioxide and forms a mixture of a metal oxide and a metal carbonate. which carbonate is formed?

Now, question is why MgO but not CaO.

At a dissociation pressure of 1 atm, the temperature at which CO2 and metal oxide is formed is :

For MgCO3 =  540 °C
For CaCO3  =  900 °C” 
Also,
The driving force is the larger lattice energy of MgO(3795) vs that of CaO(3414 kJ mol^-1) . More the lattice energy, the more chances of that compound to form.
So MgO is formed first.

Carbonate is Calcium carbonate

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .