Batteries (10.3, 10.4, 10.5) Flashcards
What is a Dry Cell?
A dry cell is a galvanic cell where the electrolyte is thickened to a paste.
What is a Battery?
A set of two or more dry cells connected in a series.
What is a Alkaline Battery?
Alkaline batteries have potassium hydroxide instead ammonium chloride. They are more expensive and maintain a high voltage for a longer time.
What is Primary Cell?
Dry cells stop working when the chemicals are used up. They cannot be discharged.
How do you recharge the battery?
To recharge the battery, energy from the car’s engine as the car is running makes the reverse reaction occur. After many cycles, a new battery must be installed.
What are Secondary Cells?
Cells that can be recharged.
What is disadvantage of nickel-cadmium cell?
The disadvantage of nickel-cadmium cell is that disposal was problem. Cadmium is toxic and can harm humans and wildlife.
What is the most popular battery and what dose it do?
The most popular battery is the lithium-ion battery because it powers cellphones, laptops, smartphones and other mobile devices.
What is a Fuel Cell?
A fuel cell converts chemical energy to electrical energy. It has two electrodes the anode and cathode and an electrolyte solution. There are differences between fuel cell and galvanic cell.
What happens in a Hydrogen Fuel Cell?
In a hydrogen fuel cell, hydrogen gas enters at the anode and oxygen gas enters at the cathode. Electrons lost by hydrogen flow out of the fuel cell to the cathode. Water is formed as the by product.
What are some of the advantage and disadvantage of the hydrogen fuel cell?
Advantage: One advantage of the hydrogen fuel is that the generate electricity with little pollution. The by product is water which is harmless.
Disadvantage: Hydrogen must be extracted from compounds, which takes a lot of energy and effort. This makes hydrogen expensive to purchase.
Hydrogen gas is combustible which makes it difficult to transport and store.
