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 more closely binds the electrons in the solution.
The process of dissolving more closely binds the electrons 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 closely binds the ions in the solution.
The process of dissolving closely binds the ions in the solution.
The process of dissolving frees the atoms in the solution to move.
Which statement correctly describes the conductivity of the specified material?(1 point)
Responses
Copper has low conductivity.
Copper has low conductivity.
Plastics have high conductivity.
Plastics have high conductivity.
Aluminum has a low conductivity.
Aluminum has a low conductivity.
Gold has high 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 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 would not move through the wire if there was no rubber around the wire.
Electrons easily move through the rubber around the wire.
Electrons easily move through the rubber around the wire.
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.
Which statement describes a similarity between conductors and insulators?(1 point)
Responses
They both allow for the free flow of electrons between atoms.
They both allow for the free flow of electrons between atoms.
They both involve high resistance to electrical charge.
They both involve high resistance to electrical charge.
They can both be made without matter.
They can both be made without matter.
They can both be used in an electric circuit.
They can both be used in an electric circuit.
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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 more closely binds the electrons in the solution.
The process of dissolving more closely binds the electrons 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 closely binds the ions in the solution.
The process of dissolving closely binds the ions in the solution.
The process of dissolving frees the atoms in the solution to move.
Which statement correctly describes the conductivity of the specified material?(1 point)
Responses
Copper has low conductivity.
Copper has low conductivity.
Plastics have high conductivity.
Plastics have high conductivity.
Aluminum has a low conductivity.
Aluminum has a low conductivity.
Gold has high 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 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 would not move through the wire if there was no rubber around the wire.
Electrons easily move through the rubber around the wire.
Electrons easily move through the rubber around the wire.
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.
Which statement describes a similarity between conductors and insulators?(1 point)
Responses
They both allow for the free flow of electrons between atoms.
They both allow for the free flow of electrons between atoms.
They both involve high resistance to electrical charge.
They both involve high resistance to electrical charge.
They can both be made without matter.
They can both be made without matter.
They can both be used in an electric circuit.
The correct answer for the first question is: "The process of dissolving frees the ions in the solution to move."
The correct answer for the second question is: "Gold has high conductivity."
The correct answer for the third question is: "Electrons would not move through the wire if there was no rubber around the wire."
The correct answer for the fourth question is: "They can both be used in an electric circuit."
The correct answer for the first question is:
The process of dissolving frees the ions in the solution to move.
When salt is dissolved in water, it dissociates into positively charged ions (Na+) and negatively charged ions (Cl-). These ions are then free to move within the solution, allowing for the conduction of electricity.
The correct answer for the second question is:
Gold has high conductivity.
Gold is a good conductor of electricity due to its high number of mobile electrons. These electrons are free to move and carry electric charge through the material.
The correct answer for the third question is:
Electrons would not move through the wire if there was no rubber around the wire.
Rubber is an insulator, which means it does not allow the free flow of electrons. The rubber coating on the power cord prevents the electrons from moving through the wire and keeps them confined within the wire.
The correct answer for the fourth question is:
They both involve high resistance to electrical charge.
Both conductors and insulators involve resistance to the flow of electrical charge. However, conductors have low resistance and allow for the free flow of electrons, while insulators have high resistance and restrict the flow of electrons.