A. Answer the following questions in a sentence.
1. Write the energy change that happens in a galvanic cell.
2. What will happen to water when it undergoes electrolysis?
3. What do you mean by electroplating?
4. What is meant by galvanisation?
5. Write any
three devices where dry cells are uses.
Answers
Answer:
1.The energy conversion that takes place in a galvanic cell is an chemical to electrical change. Galvanic cells are cells that consist of two dissimilar metals in common contact with an electrolyte.
2.The electrolysis of water produces hydrogen and oxygen gases. At the anode, water is oxidized to oxygen gas and hydrogen ions. ... At the cathode, water is reduced to hydrogen gas and hydroxide ions.
3.Electroplating is the process of plating one metal onto another by hydrolysis, most commonly for decorative purposes or to prevent corrosion of a metal. There are also specific types of electroplating such as copper plating, silver plating, and chromium plating
4.Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.
5.Dry cell types used with small motor devices include nickel-metal hydride, lead acid gel and nickel-cadmium, according to Drexel University. Small motor engines appear in many different devices, some of which include power tools, robots, wheelchairs, golf carts and computer hard disks.
Answer:
Explanation:
1. The energy conversion that takes place in a galvanic cell is an chemical to electrical change. Galvanic cells are cells that consist of two dissimilar metals in common contact with an electrolyte.
2.The electrolysis of water produces hydrogen and oxygen gases. At the anode, water is oxidized to oxygen gas and hydrogen ions. At the cathode, water is reduced to hydrogen gas and hydroxide ions.
3.Electroplating is the process of plating one metal onto another by hydrolysis, most commonly for decorative purposes or to prevent corrosion of a metal. There are also specific types of electroplating such as copper plating, silver plating, and chromium plating.
4. Galvanisation or is the process of applying a protective zinc coating to iron or steel, to prevent rusting.It forms a barrier that prevents corrosive substances from reaching the underlying steel or iron.
The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc.
5. Dry cell types used with small motor devices , flashlights and portable radios.