The answer is A.) Energy of the sun strikes photovoltaic cells producing a flow of electrons.
The other answers describe geothermal power, nuclear power, and fossil fuels, in that exact order.
Answer:
During this reaction electron is transfer from copper to silver.
Explanation:
Ionic equation:
Cu + 2Ag⁺ → Cu²⁺ + 2Ag
Given equation shows that the silver on left hand side is present in the form of cation. The charge on silver is +1 it means one electron is lost by one silver atom. While copper is present in neutral form with oxidation state zero.
Thus copper lose two electron and gain +2 charge these two electrons are accepted by two silver atoms and became neutral.
This equation shows the redox reaction.
Silver gets reduced by gaining the electron and copper gets oxidized by losing the electrons.
Oxidation:
Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.
Reduction:
Reduction involve the gain of electron and oxidation number is decreased.
Answer is: B. they are poor conductors of heat.
Ionic compounds are good good electricity and heat conductors, because ionic compounds (for example sodium chloride NaCl) have mobile ions (cations and anions) that are able to transfer electrical charge. This compounds also conduct heat, because the ions are next to each other, so energy can be transferred efficiently from one place to another.
On the other hand, covalent compound (for example methane) are usually bad electricity and heat conductors, because molecules aren far from each other, so heat transfer is less efficient. They do not form ions and atoms are less positive and negative than in ionic compounds.
Independent Variable: amount of sunlight given
Dependent Variable: How tall the plants grow
Control: The plant given no sunlight
Answer:
The table feels cold because it is at a lower temperature than the students' hands, and thermal energy is being pulled into the table.
Explanation: