Which of the following best describes the difference between a heterogeneous mixture and a homogeneous mixture?

 A heterogeneous mixture means it's a mixture of two different substances, and a homogeneous mixture involves a mixture of chemicals that are alike or the same

Explanation:

My very simple trick for this is think of it like sexuality, homosexual means two people of the same sex being together, heterosexual means to be with someone of the opposite sex. Homo = same or alike. Hetero = opposite or different

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

its first and third is your answer i did the qustion the fourth isnt right