- 1. If there are 5.25×10²³atoms lead, how many grams of lead are there?
A) 181.70g
B) 180.70g
C) 181.90g
D) 180.90g
- 2. What group consists of very active metal and are good conductors of heat and electricity?
A) Alkaline Earth Metals
B) Halogens
C) Alkali metals
D) Noble Gases
- 3. How many main groups are there in the periodic table?
A) Eighteen
B) Four
C) Seven
D) Eight
- 4. What does the group number of an element represent?
A) Number of electrons
B) Number of valence electrons
C) Number of protons
D) Number of orbits
- 5. Who is credited with developing the first periodic table?
A) Lothar Meyer
B) Alexander Beguyer de chancourtois
C) John Newlands
D) Dimitri Mendeleev
- 6. What is the term used to describe the tendency of an atom to attract electrons?
A) Electronegativity
B) Ionization energy
C) Atomic weight
D) Electron affinity
- 7. Why is mole concept important
A) All of the above
B) It can be applied to any type of particle representative.
C) It gives us convenient way to express large numbers
D) It is useful when converting between grams and atoms or molecules
- 8. Which principle states that electron should a Occupy first the orbitals with lower energy before those with higher energy?
A) Pauli exclusion principle
B) Hund's rule
C) Aufbau principle
D) Octet rule
- 9. Which among the following elements has a molar mass of 197 g/mol?
A) Tungsten
B) Gold
C) Zinc
D) Silver
- 10. You have 7.89×10²³ molecules of agua oxinada (H2O2). How many grams of it can produce?
A) 44.70g
B) 45.70g
C) 45.59g
D) 44.59g
- 11. Which type of chemical formula shows the actual number and arrangement of atom in a molecule?
A) Structural formula
B) Molecular formula
C) Empirical formula
- 12. What element in group lll (3) is a non-metal?
A) Gallium
B) Aluminum
C) Scandium
D) Boron
- 13. What type of formula provides insight into how atoms are arranged and the molecules?
A) Molecular formula
B) Chemical formula
C) Empirical formula
D) Structural formula
- 14. If the monoatomic ion has only one atom, how many atoms does a polyatomic ion have?
A) More than one atoms
B) Three atoms only
C) Ten atoms
D) Two Atoms only
- 15. What is the molecular mass of a compound with an empirical formula of in a molar mass of 88g/mol?
A) C8O2H8
B) C5O2H8
C) C402H8
D) C10O3H7
- 16. Which scientist arranged the elements and the periodic table according to the increasing atomic number?
A) Glen seaborg
B) Henry moseley
C) Lothar Meyer
D) John newlands
- 17. Which of the following units is used is expressing the amount substance in terms of number of particles?
A) Mole
B) Celsius
C) Liter
D) Gram
- 18. What is the correct chemical formula of ammonium?
A) NH3-
B) NH3+
C) NH4+
D) NH4-
- 19. The following are representative particles of matter which of the among them represents a covalent compound?
A) Ion
B) Molecule
C) Atom
D) Formula unit
- 20. Which group of elements is located in the far right column of the periodic table?
A) Alkali metals
B) Noble Gases
C) Boron group
D) Halogens
- 21. What is the atomic number of the element named after dmitri mendeleev?
A) 103
B) 106
C) 101
D) 100
- 22. What are the three main subatomic particles of an atom?
A) Proton, nucleus and neutron
B) Proton, neutron and ions
C) Proton, electron and iron
D) Proton, electron and neutron
- 23. Which of the following is an example of a molecular formula?
A) C2H6
B) CO
C) C
D) CH
- 24. What is the standard scientific unit for measuring large quantities of very small entities such as atoms molecules or other specified particles?
A) Percent
B) Kilo
C) Grams
D) Moles
- 25. What is the molar mass of CaCO3(Calcium carbonate)?
A) 102.09g/mol
B) 101.09g/mol
C) 103.09g/mol
D) 100.09g/mol
- 26. What is the molecular mass of limestone (CaCO3)?
A) 98.09g/mol
B) 100.09g/mol
C) 99.09g/mol
D) 101.09g/mol
- 27. Which of the following is an example of a polyatomic ion?
A) NO2+
B) NA+
C) K+
D) Ca+
- 28. What is the representative particle of ionic compounds?
A) Molecule
B) Ion
C) Atom
D) Formula unit
- 29. Which one of the following elements is used in computer chips?
A) Chlorine
B) Silver
C) Neon
D) Silicon
- 30. Which type of chemical formula shows the simplest whole-number ratio of atoms in a compound?
A) Empirical formula
B) Molecular formula
C) Structural formula
- 31. Using the group number how many valence electrons does platinum have?
A) 11
B) 10
C) 9
D) 12
- 32. Using the periodic table compute the molar mass of baking soda (NaHCO3)
A) 90.81g/mol
B) 85.06g/mol
C) 84.02g/mol
D) 80.09g/mol
- 33. How many mole/s of Lithium have 6.02×10²³ atoms of lithium?
A) 4
B) 1
C) 2
D) 3
- 34. What best describes metalloids?
A) They are all good conductor
B) They have characteristic of both metals and non-metals
C) They are poor conductor
D) They are normally unreactive
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