Can someone helo me with my Physics homework?

Phase changes are chemical changes. true or false

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Which of the following statement is false ? a.batteries should never be stored on metal trays or outside in the elements)b, battery acid cannot be neutralized)c.do not stack batteries on top of each other)d.never put a damaged battery in a dumpster. i