Chemistry Lab
Percent of Oxygen in Potassium Chlorate

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.