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