How can you know if a substance is an acid or base what indicators would we use?

Is a chemical message sent by another individual.

What is the relationship between particles in matter

Assignment directions: pick one of the following chemists and perform a bit of research on him/her. answer the following questions. alice hamilton             rosalind franklin marie curie             gertrude b. elion ada yonath             henry cavendish robert boyle             antoine lavoisier mario j. molina             svante arrhenius