A stretched rubber band is an example of: A. Kinetic energy

B. Potential energy

C. Gravitational energy

D. Light energy

Potential Energy

Explanation:

Not sure how to explain it but C and D could be crossed off as answers, kinetic energy would be if it was released (?)

sorry if im wrong

air quality

poor drinking water

and heavy polution

can lead to poor health

"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"