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Chemistry Bunco!

Chemistry Bunco!. What is the name of this device? Which scientist used this device?. Round 1. Cathode Ray tube JJ Thomson. Round 1 -Answer. What experiment did Millikan do and what was one of his conclusions?. Oil Drop Experiment

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Chemistry Bunco!

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  1. Chemistry Bunco!

  2. What is the name of this device? • Which scientist used this device? Round 1

  3. Cathode Ray tube • JJ Thomson Round 1 -Answer

  4. What experiment did Millikan do and what was one of his conclusions? Oil Drop Experiment Determined the mass of an electron (1/2000ththe mass of H atom) Determined the charge on the electron (negative) Round 2

  5. What experiment did Rutherford do and describe it? Round 3

  6. Rutherford did the gold foil experiment • Bombarded a thin piece of gold foil with fast moving positively charged alpha particles • Expected the alpha particles to pass straight through. Most did, but 1 in 8000 were deflected back. Round 3 - Answer

  7. Complete the table for the main subatomic particles. Round 6

  8. State 3 observations that Rutherford made (what did he see) and 3 conclusions he made from those observations. Round 5

  9. Most of the alpha particles passed straight through the foil – atom is mostly empty space 1 in 8000 particles bounced back – atom has a very tiny, dense nucleus Some alpha particles deflected – nucleus has a positive charge b/c positive alpha particles are repelled Round 5 - Answers

  10. What does the atomic number represent? • The number of protons in the nucleus of each atom of that element Round 8

  11. What does the mass number represent? • The number of protons + neutrons in the nucleus Round 9

  12. Define isotope • Atoms of the same element that have different masses Round 10

  13. How do nuclides of the same element differ from each other (be specific)? • The have a different number of neutrons Round 11

  14. Write the nuclear symbol and hyphen notation for the nuclide that has 2 protons and 2 neutrons. • Helium-4 4He 2 Round 12

  15. Define atom • The smallest particle of an element that retains the chemical properties of that element Round 7

  16. What nuclide is used as the standard in the relative scale for atomic masses? • What is its assigned atomic mass? Round 13 Carbon-12 12 amu

  17. What is the definition of the mole? The amount of particles equal to the number of atoms in exactly 12 g of Carbon-12 Round 14

  18. How many particles are in one mole? 6.022x1023 Round 15

  19. What is the name given to the number of particles in one mole? Avogadro’s number Round 16

  20. Calculate the average atomic mass of argon to 2 decimal places give the following isotopes: • Argon-36 (35.97amu; 0.337%) • Argon-38 (37.96amu; 0.063%) • Argon-40 (39.96amu; 99.600%) 39.95 amu Round 17

  21. Naturally occurring boron is 80.20% boron-11 (11.01amu) and 19.80% of another isotope. The average atomic mass of boron is 10.81amu. What must the atomic mass of the second isotope be? 10.01 amu Round 18

  22. How many atoms are in 6.755 molPb? 4.068x1024 atoms Round 19

  23. How many atoms are in 0.250 mol Si? 1.51x1023atoms Round 20

  24. What is the mass in grams of 3.011x1023 atoms F? 9.499 g Round 21

  25. What is the mass in grams of 25 atoms W? 7.6x10-21 g Round 22

  26. Determine the number of atoms in 1.50g K. 2.31x1022 atoms Round 23

  27. Determine the number of atoms in 0.02550 g Pt. 7.872x1019atoms Round 24

  28. Write the nuclear symbol and hyphen notation for the nuclide that has 6 protons and 8 neutrons. • Carbon-14 14C 6 Round 25

  29. How many isotopes does hydrogen have? Describe them. Round 26

  30. Protium – 1 proton, 0 neutrons, 1 electron (most common) • Deuterium – 1 proton, 1 neutron, 1 electron • Tritium – 1 proton, 2 neutrons, 2 electron (radioactive) Round 26 - Answer

  31. What forces holds the nuclear particles together in the nucleus? • Nuclear forces Round 27

  32. How did Dalton’s theory explain the law of conservation of mass? • Chemical reactions involve the rearrangement of atoms, but atoms are not subdivided, created or destroyed. Round 28

  33. How many protons, electrons, and neutrons are there in an atom of chlorine-37? • 17p+; 17e-; 20n0 Round 29

  34. How many protons, electrons, and neutrons are there in an atom of bromine-80? • 35p+; 35e-; 45n0 Round 30

  35. Write the hyphen notation for the element that contains 15 electrons and 15 neutrons. • Phosphorous-30 Round 31

  36. What is an amu? • 1/12 the mass of a carbon-12 atom • Atomic mass unit Round 32

  37. What is the mass in grams of 3.50 mol of the element copper? • 222 g of Cu Round 33

  38. The atomic mass of Tungsten is 83.84amu. What is the molar mass of Tungsten? • 83.84 g/mol Round 34

  39. How many atoms are in 132.90543g of Cesium? • 6.022x1023 atoms of Cs Round 35

  40. How many moles of calcium are in 5.00g of calcium? • 0.125 mol Ca Round 36

  41. How many atoms of lead are in 52.7g of lead? • 1.53x1023atoms of Pb Round 37

  42. How many neutrons does uranium 238 have? • 146 neutrons Round 38

  43. How many protons does osmium-190 have? • 76 Round 39

  44. What is the name of the nuclide that has 22 protons and 25 neutrons? • Titanium-47 Round 40

  45. Write the nuclear symbol for the isotope of sodium with mass 23 23Na 11 Round 41

  46. A student finds that 15.20g of nitrogen will react with 17.37g, 34.74g, or 43.43g of oxygen to form three different compounds. This is an example of which law? Law of Multiple Proportions Round 42

  47. State the 5 points of Dalton’s atomic theory All matter is composed of atoms Atoms of a given element are identical in size, mass, and other properties Atoms cannot be subdivided, created, or destroyed Atoms of different elements combine in simple whole-number ratios to form chemical compounds In chemical reactions, atoms are combined, separated, or rearranged. Round 43

  48. Which aspects of Dalton’s atomic theory were incorrect? Atoms cannot be subdivided – we know atoms are made of protons, neutrons & electrons. Atoms of a given element are identical in size, mass… - we know isotopes exist Round 44

  49. Describe 4 properties of electrons that were determined based on the experiments of Thomson and Millikan. Round 4

  50. Electron is negatively charged Has a mass of 1/2000th of H atom Has a fixed charge to mass ratio Present in atoms of all elements Round 4 - Answers

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