How old is earth according to the geological time scale?
a. 290 million years old
b. 542 million years old
c. 2.5 billion years old
d. 4.6 billion years old

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

In pqr m< p=60 m< q= 30 and m

The arrangement of particles is most ordered in a sample of