1. The electrolytic purification of copper can be carried out in an apparatus similar to the one shown below. I Impurition Most of the current passed through the cell is used to dissolve the copper at the anode and precipitate pure copper onto the cathode. However, a small proportion of it is wasted in dissolving the impurities at the anode which then remain in solution. When a current of 20.0 A was passed through the cell for 10.0 hours, it was found that225 g of pure copper was deposited on the cathode. Calculate the following: a. number of moles of copper produced at the cathode.[1] b. number of moles of electrons needed to produce this copper [1] C. number of moles of electrons that passed through the cell. [1] d. Hence calculate the percentage of the current through the cell that has been wasted in dissolving the impurities at the anode [2]​

when atmosphere interacts with biosphere they focuses on on the sources and sinks of green house gases (ghgs) air pollutants, particular matters, water and energy between the earth's surface and the atmosphere. the biosphere affects the climate. the atmosphere and biosphere are in constant interaction with each other, and all living things rely on gases in the atmosphere for life. organisms such as animals take in oxygen gas form the atmosphere to use in every cell of their body for smooth functioning of daily routine exercises.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.