How many of each atom is present in the product ag2s

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

  the mississippians were considered to be  horticulturalists, which means they were

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.