Pure water and pure salt are poor conductors of electricity. When salt is dissolved in water, the resulting solution conducts electricity well. Which statement explains why this occurs with these substances?(1 point)
Responses
The process of dissolving closely binds the ions in the solution.
The process of dissolving closely binds the ions in the solution.
The process of dissolving frees the electrons in the solution to move.
The process of dissolving frees the electrons in the solution to move.
The process of dissolving frees the atoms in the solution to move.
The process of dissolving frees the atoms in the solution to move.
The process of dissolving more closely binds the electrons in the solution.
The process of dissolving frees the ions in the solution to move.
Which statement correctly describes the conductivity of the specified material?(1 point)
Responses
Gold has high conductivity.
Gold has high conductivity.
Plastics have high conductivity.
Plastics have high conductivity.
Copper has low conductivity.
Copper has low conductivity.
Aluminum has a low conductivity.
Gold has high conductivity.
A person plugs a power cord into an electrical outlet in the wall. The power cord is covered in black rubber. Which statement is an accurate description of the materials?(1 point)
Responses
Electrons move through air when the cord is a few inches from the outlet.
Electrons move through air when the cord is a few inches from the outlet.
Electrons easily move through the rubber around the wire.
Electrons easily move through the rubber around the wire.
Electrons would easily move through the person if there was no rubber around the wire.
Electrons would easily move through the person if there was no rubber around the wire.
Electrons would not move through the wire if there was no rubber around the wire.
Electrons easily move through the rubber around the wire.
Which statement describes a similarity between conductors and insulators?(1 point)
Responses
They both involve high resistance to electrical charge.
They both involve high resistance to electrical charge.
They both allow for the free flow of electrons between atoms.
They both allow for the free flow of electrons between atoms.
They can both be made without matter.
They can both be made without matter.
They can both be used in an electric circuit.