A new material is formed in <span>result of a chemical change. Typically, the chemical changes always make the new material.</span><span />
Answer:
a)
b)
Explanation:
a) The reaction:

The free-energy expression:

![E=E_{red}-E_{ox]](https://tex.z-dn.net/?f=E%3DE_%7Bred%7D-E_%7Box%5D)
The element wich is reduced is the Fe and the one that oxidates is the Mg:

The electrons transfered (n) in this reaction are 2, so:


b) If you have values of enthalpy and enthropy you can calculate the free-energy by:

with T in Kelvin


Answer:
Muscular contractions that moves food along the digestive tract.
Adrenaline gives you energy and stimulates your heart. When in stressful situations, like survival, you’re body is reacting and releasing this hormone.