The half-life of strontium-90 is 28 years. how long will it take a 52 mg sample to decay to a mass of 13 mg?

5. how can you decrease the pressure of a gas in a container without changing the volume of the gas?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Consider the equilibrium system: 2icl(s) ⇄ i2(s) + cl2(g) which of the following changes will increase the total amount of of cl2 that can be produced? all of the listed answers are correct decreasing the volume of the container removing the cl2 as it is formed adding more icl(s) removing some of the i2(s)