5. 160 mg of radioactive metal X is used in the laboratory. The half-life is measured to be 80 mins.

A. What is the mass of this radioactive metal remaining after 6 hours?

B. How long does it take to reduce the mass to 1.25 mg?

Water's surface tension and heat storage capacity are accounted for by its a) orbitals b) weight c) hydrogen bonds d) mass e) size

Compare and contrast solutions and suspensions

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth