1. The Atom: From Idea to Theory The Structure of the Atom Counting Atoms
Ch. 3 REVIEW
The Atom: From Idea to Theory
The Structure of the Atom
Counting Atoms

2. Section 1
Who coined the term “atom?”

3. Section 1
Explain the law of conservation of mass

4. Section 1
Explain the law of definite proportions

5. Section 1
Explain the law of multiple proportions

6. Section 1
What is a chemical reaction?

7. Section 1
Who proposed the Atomic Theory?

8. Section 1
State 2 of the 5 parts of Dalton’s Atomic Theory

9. Section 1
Distinguish between scientific theory and a scientific law

10. Section 1
Three compounds containing potassium and oxygen are compared. Analysis shows that for each 1.00 g of O, the compounds have 1.22 g, 2.44 g, and 4.89 g of K, respectively. Show how these data support the law of multiple proportions.

11. Section 2
Define atom

12. Section 2
Identify the 2 regions of an atom… state what subatomic particles are found in each.

13. Section 2
JJ Thomson is given credit for discovering what?

14. Section 2
What did JJ Thomson use in his experiments that led to the discovery of the electron?

15. Section 2 What atomic model did JJ Thomson propose?
Describe this model.

16. Section 2
Before Thomson’s plum pudding model, the model that existed and was widely accepted was the solid sphere model. Who proposed the idea of the solid sphere model?

17. Section 2
Explain Rutherford’s gold foil experiment (procedure & conclusion)

18. Section 2
What is the name of the atomic model proposed by Rutherford based on his gold foil experimental results?

19. Section 2 Niels Bohr proposed the _________________
Model of atomic structure. Describe this model.

20. Section 2
What two subatomic particles are found in the nucleus? What holds these particles together in the nucleus?

21. Section 2
State the location, charge, and relative masses of the 3 subatomic particles

22. Section 3
Define atomic number

23. Section 3
Define mass number (or atomic mass)

24. Section 3
What units are used to described the mass #?

25. Section 3
What is the name of the instrument used to measure the atomic mass of an atom?

26. Section 3
Explain what isotopes are.

27. Section 3
Do isotopes of an element have different atomic #’s or different mass #’s?

28. Section 3
What is a nuclide?

29. Section 3
Write the 3 isotopes of Hydrogen in hyphen notation.

30. Section 3
Write the nuclear symbol for uranium-235 (use the periodic table!)

31. Section 3
Define the term mole

32. Section 3
What is Avogadro’s Number?

33. Section 3
Define molar mass

34. Section 3
What is the average atomic mass of an element?

35. Section 3
What is meant by the term “percent abundance” of an element?

36. Section 3
Isotopes of an element have different masses. Does this cause them to differ in their chemical behavior?

37. Section 3
How do you determine how many atoms are in a certain amount of moles of a substance?

38. Section 3
How do you determine how many atoms are in a certain amount of grams of something?

39. Section 3
How do you determine how many moles are in a certain amount of grams of something?