Worksheet: Development of Atomic Theory, Exercises of Chemistry

Download Worksheet: Development of Atomic Theory and more Exercises Chemistry in PDF only on Docsity! Worksheet: Development of Atomic Theory Name___________________ True-False: place a "+" in the blank if the statement is true, and a "O" in the blank if the statement is false. 1. Dalton's atomic theory stated: a. atoms are indivisible. _____ b. all atoms of the same element are alike. _____ c. atoms unite in small, whole number ratios _____ to form compounds. 2. The Greek philosopher Democritus was one of the first _____ to suggest the existence of atoms. 3. The word "atom" means invisible. _____ 4. A theory is an explanation of observable facts and _____ phenomena. 5. Aristotle supported the idea of the atom. _____ 6. From the "gold-foil" experiment it was concluded that _____ the atom is mostly empty space. Short Answer and Fill in the Blanks: 1. What must models and theories do in order to remain valid? a. b. 2. The "gold-foil" experiment had the following results: ____________ of the alpha particles were deflected, ______________ of the alpha particles were reflected, and _____________ of the alpha particles passed through the gold foil.