Battery Flashcards
(25 cards)
What converts chemical energy into electrical energy in a battery?
Cells
A battery is made up of cells that perform this conversion.
What is the primary function of a cell?
To convert chemical energy into electrical energy.
What separates the two different metals in a simple cell?
An electrolyte.
What type of cell has high power density and is also known as a dry cell?
Primary cell.
What is a characteristic of secondary cells?
They have a reversible chemical reaction.
What is a primary difference between primary and secondary cells regarding internal resistance?
Primary cells have high internal resistance, while secondary cells have low internal resistance.
What is electrolysis?
The process by which ionic substances become disassociated when an electric current is passed through.
What must an electrolyte contain for electrolysis to work?
Ions.
During electrolysis, where do positively charged ions move?
To the negative electrode (cathode).
What is the process of electroplating?
An electrolytic process where a metal is deposited over a surface.
What is anodising?
The deposition of an oxide film on a metal surface by electrolysis.
What is galvanic cathodic protection?
Protecting a metal surface using another more reactive metal.
What happens when a metal reacts with an acid?
It produces a salt and hydrogen gas.
What indicates that a metal is reactive?
It easily participates in chemical reactions.
What are some examples of highly reactive metals?
- Potassium
- Sodium
- Calcium
What is an alloy?
A mixture of two or more metals.
What can affect the reactivity of an alloy with acids or alkalis?
The elements within the alloy.
What is chemical etching?
A process used to make markings or create features on metal surfaces.
What are some applications of electroplating?
- Improve aesthetics
- Reduce corrosion
What can chemical etching be used for?
- Making copper traces on circuit boards
- Changing surface texture
What is the result of a reaction between a metal and an acid?
Hydrogen gas is produced.
Fill in the blank: A _______ is a mixture of two or more metals.
Alloy.
True or False: Covalently bonded compounds can act as electrolytes.
False.
What is the main purpose of anodising?
To increase the thickness of the natural oxide layer on metallic parts.
