If 50% of radioactive element remains after 4000 years what what is the half life

Why was gold not historically used for tools?

If the half-life of a radioactive substance is 2 seconds, how much of a 100-gram sample would be left after 8 seconds?

The pH of a neutral solution is below 7 above 7 7 7.5

Which causes fermentation

What is the molar mass of SF2

Which of the following statements is true? A. Particles of a solid have a very orderly, three dimensional arrangement and do not move B. Particles of a liquid change shape and volume C.

How does hess's law use intermediate reactions to calculate the enthalpy of a desired reaction?

Which atomic particle dtermines the chemical behaviour of an atom?

If you could travel to the Sun and back, about how far would you travel? A. 1 AU B. 2 AU C. 5 AU D. 10 AU

A scientist is conducting a descriptive experiment where she is monitoring sea level along coastal towns in California. What is a major benefit of this experiment? The relationship shows cause and effect. It is repeatable.