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C-3 Study Guide
PART A: Use the terms/statements from the word bank to complete/answer each #1-10.
A) multiple proportions
C)the same ratio of elements
E) of each element are identical in size, mass, and other properties
F) The number of protons in an atom is its atomic number.
G) Atoms of the same element may have different masses.
H) the particles of the beam (electrons) were negatively charged
I) electron
J) of each element are identical in size, mass, and other properties
1. Experiments with cathode rays led to the discovery of the
2. In oxides of carbon, such as CO and CO2, atoms combine in small whole-number ratios. This evidence
supports the law of .
3. When an electrical current passed through a glass tube, it caused the surface of the tube directly across from
the cathode to glow. Scientists concluded that
4. If 12g of carbon (C) combine with 16g of oxygen (O) to form the compound CO, how many grams of oxygen
will be needed to combine with the same amount of carbon to form the compound CO2?
5. Which concept in Dalton’s atomic theory has been modified?
6. According to the law of definite proportions, any two samples of NaCl have
7. The principles of atomic theory recognized today were conceived by
8. According to Dalton’s atomic theory, atoms
9. Which of the choices about protons is not part of Dalton’s atomic theory?
10. Which statement is true according to modern atomic theory?
PART B: Mark + for each true statement, mark O for each false statement.
11. After measuring the ratio of the charge of a cathode-ray particle (electron)to its mass, Thomson concluded
that the particles had a very small mass.
12. Because any element used in the cathode produced electrons, scientists concluded that all atoms contained
13. Rutherford’s gold foil experiments identified the nucleus of the atom.
14. In Rutherford’s experiments, alpha particles were used to bombard a thin metal foil.
15. In Rutherford’s experiments, most of the particles passed through the foil.
16. Because most particles fired at the metal foil passed straight through, Rutherford concluded that atoms
were mostly empty space.
17. Because a few alpha particles bounced back from the foil, Rutherford concluded that they were repelled by
densely packed regions of positive charge.
18. Rutherford’s experiments led him to conclude that atoms contain massive central regions that have a
positive charge.
19. A positively charged particle with mass 1.673x10-24g is a proton.
20. A nuclear particle that has about the same mass as a proton, but with not electrical charge is called a
21. The nucleus of an atom does not contain nearly all of the atom’s volume, but does contain nearly all of the
22. Protons within a nucleus are attracted to each other by the nuclear force.
23. An atom is electrically neutral because the numbers of protons and electrons are equal.
24. Most of the volume of an atom is occupied by the electrons.
25. The radius of an atom extends to the outer edge of the region occupied by the electrons.
26. Isotopes are atoms of the same element that have different masses.
27. The most common form of hydrogen has no neutrons.
28. The mass number of deuterium is 2.
29. All isotopes of hydrogen contain one proton.
30. The atomic number of nitrogen, 7, indicates that there are seven protons in the nucleus of a nitrogen atom.
31. The total number of protons and neutrons in the nucleus of an atom is its mass number.
32. As the mass number of an element’s isotopes increases, the number of protons remains the same.
33. All atoms of the same element have the same atomic number.
34. Atoms of the same element can differ in mass number.
35. In determining the atomic mass of elements, the standard is the C-12 atom.
***SPECIAL NOTE----All the previous statements #11-35 were true =-)
PART C: Calculate the following using dimensional analysis.
36. What is the mass of 3.5 mol of Magnesium?
37. How many moles are in 25.01 g of Sodium?
38. How many atoms are in 28.02 g of Nitrogen?
40. A sample of tin contains 3.011x1023atoms, what is the mass of the sample?
41. How many atoms are present in 5.00 mol of lithium atoms?