An object has a mass of 100 grams and a volume of 20cm. what is the density of the object?

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

18. use the activity series to predict whether the following synthesis reaction will occur. write the chemical equations for the reaction if it's predicted to occur. (s) + o2(g) -> *note: it is possible.*

Consider the following system at equilibrium. caco3(s) ca2+(aq) + co32–(aq) the addition of which compound will cause a shift in equilibrium because of a common ion effect? ccl4 co2 cuso4 na2co3