14. If one half-life is the amount of time it takes for a radioactive isotope to decay by a factor of 2, approximately which percent describes how much of the initial quantity of a substance would
remain after 2.3 half-lives?

Express the following number in scientific notation. 0.026890 =

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?

Over the last 90 years, scientists have added to the body of evidence supporting the big bang theory. what is the latest piece of evidence discovered in 2014?