___ ion is widely added to local water supplies to help prevent tooth decay

If a 60-g object has a volume of 30 cm3, what is its density? 2 g/cm3 0.5 cm3/g 1800 g * cm3 none of the above

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

What method(s) do plants use to obtain nitrogen? select all that apply. absorb it from the atmosphere use bacteria to convert nitrogen to usable form obtain usable nitrogen compounds from the soil absorb nitrogen from water taken in at the roots