Suppose you found a material in which 12.5% of the orginal radioactive atomes were present. if the half is 470 years, how old is the material

Compare and contrast physical changes with chemical changes.

Generally, observed behavior that can be formulated into a statement, sometimes mathematical in nature, is called a(n): a. observation. b. measurement. c. theory. d. natural law. e. experiment.

At 35.0°c and 3.00 atm pressure, a gas has a volume of 1.40 l. what pressure does the gas have at 0.00°c and a volume of 0.950 l? which equation should you use? p2= p1v1t2/t1v2what is the pressure of the gas? 3.92 atm these are the answers