The half life for the radioactive decay of potassium- to argon- is years.
suppose nuclear chemical analysis shows that there is of argon- for every of potassium- in a certain sample of rock. calculate the age of the rock.
round your answer to significant digits.

Initially, the balloon had 3.0 liters of gas at a pressure of 400 kpa and was at a temperature of 294 k. if the balloon is cooled to 277 k and its volume decreased to 1 l, what will the new pressure in the balloon be?

Can someone me with 6 to 10 plz this is for masteries test.

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy