SGC-Chem Test 2 SP1
  • 1. Which statement about the atomic nucleus is correct?
A) It is composed of protons and electrons
B) It is composed of protons and neutrons
  • 2. The charge on an electron is
A) +
B) -
  • 3. Atoms have no charge because they
A) have an equal number of charged and noncharged particles.
B) have an equal number of electrons and protons.
  • 4. Which of the following is a physical change?
A) cooking eggs
B) breaking a pencil
  • 5. The order of elements in the modern periodic table is based on
A) Atomic Number
B) Atomic Mass
  • 6. Atoms of elements that are in the same group have the same number of
A) Valence Electrons
B) Protons
  • 7. Which of the following is a chemical property?
A) color
B) pH
  • 8. Oxygen has atomic number 8. This means that an oxygen atom has
A) a total of eight neutrons and electrons.
B) eight protons in its nucleus.
  • 9. An atom's mass number equals the number of
A) protons plus the number of electrons.
B) protons plus the number of neutrons.
  • 10. Which statement about the alkali metals is correct?
A) They are extremely nonreactive.
B) They are located in the left-most column of the periodic table.
  • 11. Which statement about noble gases is correct?
A) a basically nonreactive.
B) They form compounds with very bright colors.
  • 12. Elements in group 7A
A) exist in all three states of matter in normal conditions
B) are nonreactive
  • 13. Carbon and other nonmetals are found in which area of the periodic table?
A) On the right side.
B) On the left-most side.
  • 14. Isotopes of the same element have the same atomic ________, but different atomic __________.
A) mass;number
B) number; mass
  • 15. An carbon-18 has how many neutrons?
A) 12 neutrons
B) 6 neutrons
  • 16. Group 1A is called
A) Alkaline Earth
B) Alkaline Metals
  • 17. Group 2A is called
A) Alkaline Earth
B) Akali
  • 18. Group 7A is called
A) Halogens
B) Alkali
  • 19. Group 8A is called
A) Alkali
B) Noble Gases
  • 20. Group 2A elements have how many valence electrons?
A) 2
B) 3
  • 21. Most elements are
A) metals
B) nonmetals
  • 22. Who arranged the FIRST periodic table
A) Mendleev
B) Mosely
  • 23. Elements in the ORIGINAL periodic table were organized
A) according to atomic number
B) According to atomic mass
  • 24. Using the periodic table, how would you determine the number of protons and electrons in an atom?
A) Atomic Mass-Atomic Number
B) Atomic Number
  • 25. Using the periodic table, how would you determine the number of neutrons in an atom?
A) Atomic Number
B) Atomic Mass-Atomic Number
  • 26. The subatomic particle that always stays the same and therfore is used to identify elements is
A) protons
B) neutrons
  • 27. Which of the following is a physical property?
A) color
B) pH
  • 28. Which of the following is a chemical property?
A) pH
B) shape
  • 29. Which of the following is a chemical change?
A) adding dye
B) burning
  • 30. Which of the following is a physical change?
A) burning
B) breaking
  • 31. Physical Properties
A) can be observed with senses
B) vary within the same element
  • 32. Chemical Properties
A) cn only be observed by changing the substance
B) can be observes with the senses
  • 33. Melting point is what type of property?
A) physical
B) chemical
  • 34. Density is what type of property
A) physical
B) chemical
  • 35. If I place a walnut that has a density of 0.85g/ml in water that has a density of 1g/ml, what will happen to the walnut
A) it will float
B) it will sink
  • 36. What is the SI unit for volume?
A) second
B) liters
  • 37. What is the SI unit for length?
A) meters
B) hours
  • 38. The accepted value for the density of water is 1.01g/mL. You perform the calulation for a sample of water 3 times and determine the density to be 2.1g/mL , 2.3g/mL, and 2.1g/mL. Your data can be described as
A) precise
B) accurate
  • 39. What does the prefix kilo- mean?
A) 1,000
B) 100
  • 40. In an experiment, the variable that is being tested (chosen by the experimenter) is the
A) independent
B) dependent
  • 41. Two students were testing the amount of fertilizer that would best promote the growth of strawberries in a garden. Which of the following would be the independent variable?
A) growth
B) fertilizer
  • 42. Convert 2.5 kilometers to meters. PUT THE CORRECT UNIT ABREVIATION.
A) 2,500m
B) 0.00025m
  • 43. Convert 165 decigrams to grams. PUT CORRECT UNIT ABBREVIATION.
A) 1.65g
B) 16.5g
  • 44. Put in scientific notation: 947
A) 9.470x102
B) 9.470x10-2
  • 45. Put in scientific notation:0.0042
A) 4.2x103
B) 4.2x10-3
  • 46. Put in standard form: 8.75 x 10-5
A) 0.0000875
B) 87,500
  • 47. Put in standard form: 6.34 x 104
A) 0.00634
B) 63,400
  • 48. The variable that is measured in an experiment is the
A) independent
B) dependent
  • 49. This tool is used to measure accurate volume.
A) graduated cylinder
B) beaker
  • 50. An Al^+3 ion has how many electrons?
A) 10
B) 13
  • 51. A Cl^- ion has how many electrons?
A) 18
B) 17
  • 52. A Mg^+2 has how many protons?
A) 10
B) 12
  • 53. A particular atom of oxygen has 10 neutrons. What is the mass number of that atom?
A) 18
B) 10
  • 54. What is that average atomic mass of an element with the following two known isotopes? Isotope 1 has a mass of 55amu and a relative abundance of 60%. Isotope 2 has a mass of 60amu and a relative abundance of 40%.
A) 57 amu
B) 0.57 amu
  • 55. How many significant figures are in the number 5,001
A) 4
B) 2
  • 56. How many moles are in 44.8L of H2 gas?
A) 2 mol
B) 89.6 mol
  • 57. How many atoms of Al are present in 3.5 moles?
A) 2.107x1024 atoms
B) 1.72x1023 atoms
  • 58. Convert 2.3mi to feet
A) 12,144ft
B) 2,295ft
  • 59. Convert 15 lbs to kg
A) 33.3kg
B) 6.75kg
  • 60. Who is credited with the discovery of the electron?
A) Thomson
B) Rutherford
  • 61. Who performed the gold foil experiment?
A) Democritus
B) Chadwick
C) Rutherford
  • 62. Who said that electrons exist in an electron cloud?
A) Shrodinger and Heisenburg
B) Bohr
  • 63. Whose atomic model is this?
A) Thomson
B) Bohr
  • 64. Which of the following assumptions in Dalton's atomic theory of matter do we know not to be true?
A) All matter is made of atoms.
B) Atoms of the same element are exactly alike.
  • 65. Who is credited for the discovery of the neutron?
A) Chadwick
B) Bohr
  • 66. Which of these is true about electrons?
A) The mass of electrons is much smaller than the mass of protons and neutrons.
B) The mass of protons and neutrons are much smaller than the mass of the electron.
  • 67. If an atom gains electrons, the resulting ion will have a
A) positive charge
B) negative charge
  • 68. What subatomic particle helps to determine the type of atom?
A) electrons
B) protons
  • 69. When a rock is placed in a graduated cylinder containing 10mL of water, the level rises to 18ml. The rock is then dried off and theplaced on a scale and the mass is determined to be 24g. What is the density of the rock?
A) 3g/ml
B) 72g/ml
  • 70. What is the mass of a cube that has a density of 16g/cm3 and a volume of 1.5cm3?
A) 10.7g
B) 16g
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