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Unit 3 Exam

Unit 3 Exam. Review. Question 1. Dalton’s atomic theory was accepted because A . There was evidence to support it . B . Democritus said that it was correct C . Dalton invented the electron microscope D . Dalton showed how molecules are formed. Question 1.

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Unit 3 Exam

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  1. Unit 3 Exam Review

  2. Question 1 Dalton’s atomic theory was accepted because A. There was evidence to support it. B. Democritus said that it was correct C. Dalton invented the electron microscope D. Dalton showed how molecules are formed

  3. Question 1 Dalton’s atomic theory was accepted because A. There was evidence to support it. B. Democritus said that it was correct C. Dalton invented the electron microscope D. Dalton showed how molecules are formed

  4. Question 2 Atoms are neutral (no net electric charge) when they A. have an equal number of charged and non-charged particles B. have neutrons in their nuclei C. have an equal number of electrons and protons D. have an equal number of neutrons and protons

  5. Question 2 Atoms are neutral (no net electric charge) when they A. have an equal number of charged and non-charged particles B. have neutrons in their nuclei C. have an equal number of electrons and protons D. have an equal number of neutrons and protons

  6. Question 3 The atomic theory of the ancient Greek philosopher Democritus was revised because

  7. Question 3 The atomic theory of the ancient Greek philosopher Democritus was revised because

  8. Question 4 In 1803 Dalton was the first person to develop an atomic theory based on lab experiments. Which of these statements is not part of Dalton’s atomic theory?

  9. Question 4 In 1803 Dalton was the first person to develop an atomic theory based on lab experiments. Which of these statements is not part of Dalton’s atomic theory?

  10. Question 5 A subatomic particle that has a negative charge is called a(n) A. molecule B. electron C. element D. compound

  11. Question 5 A subatomic particle that has a negative charge is called a(n) A. molecule B. electron C. element D. compound

  12. Question 6 Thomson made his discovery about the atom during an experiment using

  13. Question 6 Thomson made his discovery about the atom during an experiment using

  14. Question 7 What particle did Thomson discover? A. nucleus B. electron C. proton D. neutron

  15. Question 7 What particle did Thomson discover? A. nucleus B. electron C. proton D. neutron

  16. Question 8 Thompson’s “plum pudding” (or chocolate chip ice cream) atomic model showed the atom: A. as negative particles scattered in a positive mass B. has a negatively charged nucleus C. as positive particles scattered in a negative mass D. has neutrons and electrons

  17. Question 8 Thompson’s “plum pudding” (or chocolate chip ice cream) atomic model showed the atom: A. as negative particles scattered in a positive mass B. has a negatively charged nucleus C. as positive particles scattered in a negative mass D. has neutrons and electrons

  18. Question 9 By using his gold foil experiment, Rutherford was responsible for discovering that an atom contains A. electrons B. molecules C. anodes D. nucleus

  19. Question 9 By using his gold foil experiment, Rutherford was responsible for discovering that an atom contains A. electrons B. molecules C. anodes D. nucleus

  20. Question 10 Rutherford’s experiment produced evidence that the center of an atom

  21. Question 10 Rutherford’s experiment produced evidence that the center of an atom

  22. Question 11 According to Bohr’s theory, an electron’s path around the nucleus defines its

  23. Question 11 According to Bohr’s theory, an electron’s path around the nucleus defines its

  24. Question 12 Evidence to support Bohr’s model comes from:

  25. Question 12 Evidence to support Bohr’s model comes from:

  26. Question 13 Which of the following statements not true?

  27. Question 13 Which of the following statements not true?

  28. Question 14 Which of these particles could be a neutron? A. Particle “A” B. Particle “B” C. Particle “C”

  29. Question 14 Which of these particles could be a neutron? A. Particle “A” B. Particle “B” C. Particle “C”

  30. Question 15 Which of these particles could be an electron? A. Particle “A” B. Particle “B” C. Particle “C”

  31. Question 15 Which of these particles could be an electron? A. Particle “A” B. Particle “B” C. Particle “C”

  32. Question 16 Which of these particles could be an proton? A. Particle “A” B. Particle “B” C. Particle “C”

  33. Question 16 Which of these particles could be an proton? A. Particle “A” B. Particle “B” C. Particle “C”

  34. Question 17 What is an atom’s nucleus made of?

  35. Question 17 What is an atom’s nucleus made of?

  36. Question 18 The atomic mass of the element shown above would be: A.9 B. 17 C. 25 D. 8

  37. Question 18 The atomic mass of the element shown above would be: A.9B. 17 C. 25 D. 8

  38. Question 19 The atomic number of the element shown above would be: A.9 B. 17 C. 25 D. 8

  39. Question 19 The atomic number of the element shown above would be: A.9 B. 17 C. 25 D. 8

  40. Question 20 An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have? A. 30 B. 56 C. 26 D. 82

  41. Question 20 An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have? A. 30 B. 56 C. 26 D. 82

  42. Question 21 An element’s atomic number is equal to its number of

  43. Question 21 An element’s atomic number is equal to its number of

  44. Question 22 Two different isotopes of an element have different

  45. Question 22 Two different isotopes of an element have different

  46. Question 23 What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons? A. 19 B. 20 C. 39 D. 58

  47. Question 23 What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons? A. 19 B. 20 C. 39 D. 58

  48. Question 24 Use a periodic table to answer this: A neutral sodium atom has how many electrons? A. 0 B. 11 C. 12 D. 23

  49. Question 24 Use a periodic table to answer this: A neutral sodium atom has how many electrons? A. 0 B. 11 C. 12 D. 23

  50. Question 25 An electron jumps to a new energy level when

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