What is the excited state of carbon

What items could scientists use to date a layer of rock

How do you determine the degree of a power function from a table? when do you know you have successfully determined the degree of the power function?

Achemist who studies water samples did a demonstration of how to test for lead in water. she added a clear solution of potassium iodide to a clear solution of lead nitrate. then a yellow swirling solid formed in the liquid. what is most likely true about the yellow solid?