The electrons lost from the reaction center of photosystem ii are replaced by the electrons from?

How many atoms are there in 5.70 mol of mg

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

2-bromo-2-methylbutane undergoes an e1 elimination reaction in the presence of ethanol. in the next reaction only one of the possible products is represented. although the product shown is not the major product of the reaction, notice that there is more than one way it can be produced. complete the mechanism and draw the missing substances.