Download DW 4-1

Name ___________________________________ Date ______________________ Class ______________________
Directions: Work the following problems based on Chapter 4 Section 1.
Title: Daily Work 4-1
Match each description in column B to the correct term in column A.
Column A
Column B
_____ 1. Atom
a. An instrument used to generate images of individual atoms.
_____ 2. Scanning tunneling
microscope
b. Greek philosopher who was among the first to suggest the existence of atoms.
_____ 3. John Dalton
_____ 4. Democritus
c. The smallest particle of an element that retains its identity in a chemical
reaction.
d. English chemist and school teacher who formulated a theory to describe the
structure and chemical reactivity of matter in terms of atoms.
5. What is an atom?
6. How did Democritus characterize atoms?
7. What were the limitations of Democritus’ ideas about atoms?
8. How did Dalton advance the atomic philosophy proposed by Democritus?
9. In your own words, state the main ideas of Dalton’s atomic theory.
10. According to Dalton’s theory, is it possible to convert atoms of one element into atoms of another? Explain.
11. Use Dalton’s theory to describe how atoms interact during a chemical reaction.
12. In what type of ratios do atoms combine to form compounds?