As the mass on the skateboard decreases, what happens to the force needed to make the skateboard move? Explain why this happens.

Calculate the change in entropy if br2(l) is converted into gaseous br atoms. s° for br2(l) = 152.2 j/(mol•k) s° for br2(g) = 245.5 j/(mol•k) s° for br(g) = 175.0 j/(mol•k)

Find the mass in grams of 1.37x1020 particles of h3po4

What is the polyatamic ion of thiosulfate