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.

Many ionic compounds and a few highly polar covalent compounds are because they completely ionize in water to create a solution filled with charged ions that can conduct an electric current.

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

2h2o2 → 2h2o + o2 synthesis decomposition combustion