Symbols of elements
jons berzelius, a swedish chemist suggested using
each symbol has or letters
the first letter is always and if there is a second letter, it is not capitalized
the symbols chosen are based on their names
the symbols allow scientists of other languages to communicate without

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged

For lesson: cameras, plant presses, newspaper, paper towels, clip boards, pencils, calculators, field guides, metric measuring tapes, paper, transect squares, colored pencils, ph meters, light meters, computers, etc.for extension: baggies for soil samples collecting, distilled water, hand shovels, beakers, boiled rice, microscopes, well microscope slides or regular microscope slides with cover slips

There are two molecules. check the attached file for the solution.