PLZ HELP ME 1. Record your observations about this substance (IMAGE 1)

2. Record your observations about this substance ( IMAGE 2)

3. Record your observations about this substance(IMAGE 3)

4. Record your observations about this substance (IMAGE 4)

5. Based on your observations, are any of the substances shown on this form the same substance? Why or why not?

Explanation:

1. the substance is dry and and slightly clumped together yet still has some powdery parts to it.

2. the substance is dry aswell, but also seems to be more flaky than powdery. the "chunks" are big enough to the point where you could most likely easily pick the individual pieces apart.

3. this substance is very powdery, to the point where it seems like I would compact easily. in the image, there is really no "stray pieces", it is all in one neat pile.

4. this substance very powdery, which we can see because the "pieces" are so small that they easily stick and clump together.

5. no, none of the substances are the same. while they do have a lot of similar properties, it is clear to see they are still all very 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"