Why secondary pollutants are more harmful than primary pollutants

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Which of these are physical changes in matter? check all that apply boiling water a pencil being sharpened exploding dynamite freezing water rotting cheese

Which factor is likely to impact the possible number of compounds? presence of unlimited number of elements in the periodic table the inability of atoms to align perfectly with other atoms the ability of all elements to react with every other element all elements being equally reactive