If a sample is thought to be several million years old, which method would best to determine its absolute age? a. c-14/c-12 b. ar-40/k-40 c. pb-206/u-238

Find the mass in grams of hydrogen gas produced when 14.0 moles of hcl is added to an excess amount of magnesium.

This drawing shows a human body system. what is the primary function of this body system?

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?