Which of the following is a true statement? a. in the process of freezing, a liquid loses kinetic energy and turns into a solid. b. in the process of freezing, a solid loses kinetic energy and turns into a liquid. c. in the process of freezing, a liquid gains kinetic energy and turns into a solid. d. in the process of freezing, a solid gains kinetic energy and turns into a liquid.

The correct answer is A. In the process of freezing, a liquid loses kinetic energy and turns into a solid.

Explanation:

The kinetic energy in a substance is produced by the movement of the participles in it. Additionally, this depends on the state of the substance, for example, in gases substances move freely and therefore produce more kinetic energy than in liquids in which the movement is more restricted or in solids in which particles only vibrate. This means, in the process of freezing that implies a liquid turning into a solid the particles lose kinetic energy as their movement is limited in a solid state.

petroleum? coal maybe?

"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"