- 2. What is the correct number of valence electrons of carbon?
A) 6
B) 2
C) 5
D) 4
- 3. Who is credited with developing the first periodic table?
A) John Newlands
B) Lothar Meyer
C) Dmitri Mendeleev
D) Alexander Beguyer de Chancourtois
- 4. What element in group III (3) is a non-metal?
A) Gallium
B) Boron
C) Aluminum
D) Scandium
- 5. In arranging the periodic table, who is the proponent of the "Law of Triads"?
A) Johann Wolfgang Dobereiner
B) John Newlands
C) Alexander Beguyer de Chancourtois
D) Glen Seaborg
- 6. Which of the following is an example of a polyatomic ion?
-
A) NO2
B) Na+
- 7. Which of the following elements is being used to determine the actual activity of the thyroid gland and to treat detected cancer cells?
A) Potassium
B) Sodium
C) lodine
D) Chlorine
- 8. What is the correct electron configuration of element Calcium (Ca)?
A) 1s² 2s² 2p 3s 3p6
B) 1s² 2s² 2p 3s 3p6 4s²
C) 1s 2s 2p 3s 3p6 4s'
D) 1s² 2s² 2p6 3s²
- 9. Which of the following units is used in expressing the amount of substance in terms of number of particles?
A) celcius
B) gram
C) liter
D) mole
- 10. What is the electron configuration of Rubidium?
A) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1
B) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
C) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
D) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p7
- 11. Which type of chemical formula shows the simplest whole-number ratio of atoms in a compound?
A) Molecular formula
B) Structural formula
C) Empirical formula
- 12. This law states that the atomic weight of the middle element is nearly equal to the atomic weight of the other two elements in the triad?
A) Perodic Law
B) Law of Triad
C) Octet Rule
D) Law of Octaves
- 13. Each element in the periodic table is assigned a number called the atomic number.
This is equal to?
A) The number of protons plus the number of electrons in each atom of that element
B) The number of neutrons in each atom of that element.
C) The number of protons in each atom of that element.
D) The number of protons and neutrons in each atom of that element
- 14. Which of the following sets of electron configuration resulted to an element belongs to noble gases?
A) 1s² 2s² 2p
B) 1s² 2s² 2p6 3s'
C) 1s² 2s² 2p5
D) 1s² 2s² 2p6 3s'
- 15. Which group of elements is located in the far right column of the periodic table?
A) Halogens
B) Alkali metals
C) Noble Gases
D) Boron Group
- 16. Each element in the periodic table is assigned a number called the atomic number.
This is equal to?
A) The number of protons plus the number of electrons in each atom of that element
B) The number of protons in each atom of that element.
C) The number of neutrons in each atom of that element.
D) The number of protons and neutrons in each atom of that element
- 17. Each element in the periodic table is assigned a number called the atomic number.
This is equal to?
A) The number of neutrons in each atom of that element.
B) The number of protons in each atom of that element.
C) The number of protons plus the number of electrons in each atom of that element
D) The number of protons and neutrons in each atom of that element
- 18. Which type of chemical formula shows the actual number and arrangement of atoms in a molecule?
A) Structural formula
B) Empirical formula
C) Molecular formula
- 19. What is the molecular mass of ammonia (NH3)?
A) 17.04 g/mol
B) 18.04 g/mol
C) 16.04 g/mol
D) 18.04 g/mol
- 20. Which of the following elements belongs to metalloids?
A) Ne
B) As
C) Ar
D) Kr
- 21. Which one of the following elements is used in computer chips?
A) Neon
B) Silicon
C) Silver
D) Chlorine
- 22. Why is mole concept important?
.
A) It gives us convenient way to express large numbers
B) It can be applied to any type of particle representative
C) All of the above
D) It is useful when converting between grams and atoms or molecules.
- 23. Which scientist arranged the elements in the periodic table according to the increasing atomic number?
A) Lothar Meyer
B) Glen Seaborg
C) John Newlands
D) Henry Moseley
- 24. Which type of chemical formula shows the actual number and arrangement of atoms in a molecule?
A) Empirical formula
B) Molecular formula
C) Structural formula
- 25. What is the molecular mass of ammonia (NH3)?
A) 18.04 g/mol
B) 17.04 g/mol
C) 18.04 g/mol
D) 16.04 g/mol
- 26. Which type of chemical formula shows the actual number and arrangement of atoms in a molecule?
A) Empirical formula
B) Structural formula
C) Molecular formula
- 27. What is the atomic number of the element named after Dmitri Mendeleev?
A) 103
B) 101
C) 100
- 28. What do you call a substance made up of two or more different elements that are chemically combined?
A) Atoms
B) Compounds
C) Elements w
D) Mixtures
- 29. Which of the following is NOT a major classification of elementsm
A) Non metals
B) Metals
C) Acid
D) Metalloids
- 30. Using the group number, how many valence electrons does Platinum have?
A) 12
B) 10
C) 11
D) 9
- 31. What is the molecular mass of limestone (CaCO3)?
A) 100.09 g/mol
B) 99.09 g/mol
C) 101.09 g/mol
D) 98.09 g/mol
- 32. How many neutrons does the element lithium have?
A) 7
B) 10
C) 3
D) 4
- 33. What is the atomic number of the element named after Dmitri Mendeleev?
A) 101
B) 106
C) 103
D) 100
- 34. Which of the following refers to the tabular arrangement of elements according to increasing atomic numbers?
A) Periodic Table
B) Orbital Diagram
C) Configuration Electron
D) Molecular Formula
- 35. Which of the following elements is the most abundant in the universe?
A) Oxygen
B) Hydrogen
C) Nitrogen
D) Carbon
- 36. How many atoms are there in 25g of Calcium?
A) 3.75x1024 atoms Ca
B) 2.45x1023 atoms Ca
C) 2.45x1024 atoms Ca
D) 3.75x1023 atoms Ca
- 37. Among the 8 families in the periodic table, which of the following groups is normally unreactive?
A) Group 6
B) Group 1
C) Group 7
D) Group 8
- 38. 31/60
If there are 5.25x1023 atoms of Lead, how many grams of Lead are there?
A) 181.90g
B) 180.90g
C) 181.70g
D) 180.70g
- 39. Which of the following radioactive isotopes is used to treat cancer by destroying cancer cells with gamma rays?
A) Gadolonium - 135
B) Cobalt - 60
C) lodine -131
D) lodine -123
- 40. How many atoms are there in 25g of Calcium?
A) 2.45x1024 atoms Ca
B) 2.45x1023 atoms Ca
C) 3.75x1023 atoms Ca
D) 3.75x1024 atoms Ca
- 41. How many electrons can p orbitals carry?
A) 6
B) 4
C) 10
D) 2
- 42. What group consists of very active metals and are good conductors of heat and electricity?
A) Alkall Metals
B) Halogens
C) Alkaline Earth Metals
D) Noble Gases
- 43. How many moles of Boron are needed to yield 50g of it?
A) 5.63 mol
B) 4,70 mol
C) 5,70 mol
D) 4.63 mol
- 44. What is the molecular mass of bleach (NaOCl)?
A) 73.45 g/mol
B) 76.45 g/mol
C) 74.45 g/mol
D) 75.45 g/mol
- 45. How many electrons can p orbitals carry?
A) 6
B) 2
C) 14
D) 10
- 46. What best describes metalloids?
A) They are normally unreactive
B) They have characteristics of both metals and non-metals
- 47. Which among the following elements has a molar mass of 197 g/mol?
A) Silver
B) Zinc
C) Gold
D) Tungsten
- 48. How many mole/s of Lithium have 6.02x1023 atoms of Lithium?
A) 2
B) 4
C) 3
D) 1
- 49. If the monoatomic ion has only one atom, how many atoms does a polyatomic ion have?
A) three atoms only
B) two atoms only
C) more than one atoms
D) ten atoms
- 50. How many main groups are there in the Periodic Table?
A) Seven
B) Eighteen
C) Eight
D) Four
- 51. What is the common name of the chemical compound that is being used as an antiseptic on the skin to prevent infection?
A) Hydrogen
B) Agua Oxinada
C) Acetone
D) peroxide
E) Aspirin
- 52. What is the representative particle of ionic compounds?
A) Formula unit
B) lon
C) Atom
D) Molecule
- 53. Using the Periodic Table, compute the molar mass of baking soda (NaHCO3).
A) 84.02 g/mol
B) 85.06 g/mol
C) 80.09 g/mol
D) 90.81 g/mol
- 54. In 0.75 mol of Aluminum, how many grams of Aluminum will be yielded?
A) 22.25g
B) 19.25g
C) 21.25g
D) 20.25g
- 55. What do you call to the vertical columns of elements in the periodic table?
A) Group
B) Subshell
C) Orbital
D) Period
- 56. The following are representative particles of matter: which of the among them represents a covalent compound?
A) molecule
B) atom
C) lon
D) formula unit
- 57. A nurse is using hydrogen peroxide to clean the wounds of her patient. What is the molar mass of hydrogen peroxide?
A) 34 g/mol
B) 33 g/mol
C) 44 g/mol
D) 16 g/mol
- 58. PO1 Cardo is always drinking coffee before reporting to his duty to increase mental alertness. What chemical compounds does coffee have?
A) Carbonate
B) Propane
C) Caffeine
D) Calcium
E) Methane
- 59. What is the correct chemical formula of ammonium?
-
A) NH3+
B) NH4
C) NH3-
D) NH4+
- 60. Which principle states that electrons should occupy first the orbitals with lower energy before those with higher energy?
A) Aufbau principle
B) Octet Rule
C) Hund's Rule
D) Pauli exclusion principle
- 61. A chemistry student is analyzing an element with an atomic number of 7 and an atomic weight of 14. What is the number of neutrons of this element?
A) 28
B) 14
C) 21
D) 7
- 62. What are the three main subatomic particles of an atom?
A) electron and iron
B) Proton, electron and neutron Proton
C) nucleus and neutron Proton
D) Proton, neutron and ions
- 63. How many particles are there in one mole of any kind of substance?
A) 3.022 x10 ^ 25
B) 6.022 x 10 ^ 24
C) 3.022 x 10 ^ 24
D) 6.022x 10 ^ 23
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