Will give brainliest if correct

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?

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?