Atom History Review WKS KEY PDF

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Dr. F...

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Basic Atom Review Worksheet KEY Select words from the word bank to complete the following statements summarizing the "chemical" features of Dalton’s Atomic Theory. At least one word in the word bank is used more than once. rearrangement

compounds

elements

atoms

a. ATOMS of different elements combine to make COMPOUNDS b. COMPOUNDS contain atoms in small whole-number ratios. c. Atoms can combine in more than one ratio to make different COMPOUNDS. d. Chemical reactions involve the REARRANGEMENT of atoms from compounds into new combinations. Which Postulate above corresponds with the Law of Conservation of Mass? Explain how this postulate includes the idea that mass is conserved in chemical reactions. Postulate d above implies that mass is conserved. If new compounds are produced using the atoms of the old compounds AND the each atom has some mass, the total mass after the reaction will be the same as before the reaction assuming that all atoms are accounted for. Match each important experimental result with its interpretation F

cathode rays bend towards a positively charged plate

A. atoms contain a dense nucleus

E

most alpha particles pass through gold foil unaffected

B. invisible particles make up water

D

few alpha particles show a 'bent path" when passing through gold foil

C. atoms have different energy levels

A

a very few alpha particles bounce off of gold foil

D. an atomic nucleus is positively charged

C

elements emit colored light when heated in a flame

E. atoms are mostly empty space

B

tiny objects will “jiggle” randomly when suspended in water

F. atoms contain negatively charged particles...