Acertain ore is 35.0% nickel by mass. how many kilograms of this ore would you need to dig up to have 10.0 g of nickel?

What is avogadro’s number, and why is it useful

How many moles of gas are present if p=11 atm, v=12l, t=185k?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line