A certain ore is 38.2 % nickel by mass. How many kilograms of this ore would you need to dig up to have 15.0 g of nickel?

When undergoing chemical reactions where does the reactant combine to the enzyme?

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Which characteristic of water it form droplets? a. low specific heat b. nonpolar structure c. high surface tension d. ability to dissolve substances