What are 2 or more of the same type of atoms joined together.
For science class plz help

Why is permeable soil best for plants that need a lot of drainage?

When balancing a chemical equation:

Calculate the ph at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (c2h5nh2) with 0.1000 m hcl solution. the volume of the solution at the equivalence point is 250.0 ml. kb forethylamine is 4.7 × 10−4 .