1.     The spin quantum number of an electron can be thoughtof as describing _______

2. How many electrons from the outermost shell does a 4s orbital possess?

3. Which set of quantum numbers uniquely defines one of the electrons in an atomic orbital with n = 2 and l = 0?                             

4. What is the electron configuration for nitrogen, atomic number 7?                       

5.  Which of these d-orbitals contains both paired and unpaired electrons?

6. How many valence electrons does Boron have?

7. Covalent andionic bonding produce certain types of compounds that have different properties. What is the general term used for all the compounds with covalentbond?

8.  Non-polar covalent bonding involves the equal sharing of electrons between atoms to attain stability. Which of the following compounds will have non-polar covalent bonding?

9.  Electrical and thermal conductivity is one of the properties of compounds. Which of the following types of bonds will have a high electrical conductivity?

10.  The following compounds are commonly found in nature or in our household. Which do you think will have the highest melting/boiling point if we are to subject those substances to heating?

11. What happens to the electron of a metal element in ionic bonding forming a compound?

12. Which best describes the position of the elements in the Periodic Table and its valence electrons?

13. Which bestd escribes an anion?

14. How many electrons does Fluorine ion need for it to be stable?

15. What ion can be combined with oxygen ions to form an ionic compound?

16.  Which of the following LED symbols best describe the anion present in the given statement?

17.   Which of the following ions is classified as polyatomic cation?

18.  As you pour the motor oil in the machine, you notice that the flow is some what thick and sticky as compared to water. What property best describes this scenario?

19.  What atom is most likely to form as an inorganic compound when it is bonded with Carbon atom?

20.  Which of the following compounds is classified as organic compounds?

21.  Which of the following sets of Organic Compounds is viscous?

I.       Ethyl Alcohol                                         III. Honey                           

II.     Liquified Petroleum Gas                  IV.Motor Oil

22.  All of these are found in every household. Which of the following household products does not belong to the group?

25.  What is the correct molecular formula of a hydrocarbon having 7 atoms that contains a single bond?                                                                           

26.  Methane is also known as biogas.  What is the use of this compound?

27. Two alkane compounds, butane and octane were placed in separate unlabeled containers. Several tests were conducted to describe properties ofthe compounds.  What properties can you observe on the two compounds?

   I.         Butane is a gas while octane is a liquid.

   II.         Butane has a lower boiling point compared to octane.

   III.         Butane is insoluble in water while octane is soluble.

   IV.         Butane is flammable while octane is not flammable.

28. Ethyl alcohol is a colorless liquid which is an ingredient ofliquors.  Which of the following is thecorrect molecular formula of ethyl alcohol?

29. What is the difference between a molecular unit from a formula unit?

30.  The following are examplesof covalent compounds, which molecule is equivalent to 1 mole?

I. 18 g H₂O             

II. 32 g O₂                          

III.  80 g CO₂                      

IV. 160 g SO₂

31.  In an experiment, a beaker contains 1.204 x 10²⁴ formula units of sodium chloride (NaCl).  How many moles are in this substance?

32. Sodium hydroxide (NaOH) or lye is a compound used for making soap. Sodium chloride (NaCl) is table salt.  If you are going to compare 40 g NaOH with 40 g of NaCl, table salt contains.

33. Glucose (C₆H₁₂O₆)is a substance that is found in the blood. This compound is a component of the intravenous solution.  If a COVID-19 patient needs 1.5 moles of glucose, how many grams of this compound should be placed in the intravenous solution?                                                        

34. The world is experiencing a pandemic situation because ofCOVID-19.  It is advised that one should boost his or her immune system.  Taking ascorbic acid (C₆H₈O₆) or commonly known as vitamin C daily will help you boost your immune system. This vitamin is usually given in a 500 mg (0.5 g) tablet. If you take one tablet per day for 15 days, how many molecules of ascorbic acid will you have?

35. Which of the following is the ratio of the atomic mass of an element in a compound and the total mass of all elements in the compound multiplied by one hundred?                  

36. Ferrous sulfate or iron (II) sulfate is a supplement prescribed to persons who has iron-deficiency anemia. It has a chemical formula of FeSO₄. Determine the percentage of iron in this compound with a molar mass of 152g/mol.

37. What is the percentage composition of water (H2O) with a molar massof 18 g/mol.?

38. In whichway can you apply the knowledge on percentage composition?

I.      in identifying the element present

II.     in checking if the substance is pure

III.   in knowing the value of the substance

IV.   in knowing the amount of sodium in instant noodles

39. Calcium carbonate (CaCO₃) is a substance naturally found in rock and mineral formations.  It is widely used for making cement and tiles. What is the percentage of calcium in this compound?

40. Given below are formulas of covalent compounds, which of thefollowing is an empirical formula?