1.) single replacement reaction. Hope this helps you.
Answer:
Products are stearate anion and water.
Explanation:
Stearic acid is a 18-carbon chain molecule containing -COOH group. IUPAC name of stearic acid is octadecanoic acid.
Molecular formula of stearic acid is
.
When
is added into stearic acid,
removes a proton (
) from acidic -COOH group and forms stearate anion and water as products.
The balanced acid-base reaction is given as:

Structure of products are given below.
Answer:
A: It is used for the phase change.
Explanation:
During a phase change, the heat added or realeased, the temperature remains constant and is used to be stored as potential energy.
Side Note: I hope this helps, feel free to let me know if you have any other questions :)
When the work is being done, it is likely that there is an energy being enforced and when the energy is being enforced, it is likely that the energy present is being transferred in order for the work to be able to be able to be exterted upon