Science 9 Review Test PDF

SCIENCE 9 Review Test For numbers 1-4. Refer to the choices given below. Show the Lewis symbol for the following compounds given the atomic number: Oxygen (O): 8 Hydrogen (H): 1 Magnesium (Mg): 12 Potassium (K): 19 a. KBr b. H₂O...

SCIENCE 9 Review Test For numbers 1-4. Refer to the choices given below. Show the Lewis symbol for the following compounds given the atomic number: Oxygen (O): 8 Hydrogen (H): 1 Magnesium (Mg): 12 Potassium (K): 19 a. KBr b. H₂O c. Mg-Mg Magnesium (Mg) → Valence electrons = 2 Lewis symbol (hypothetical) :Mg−Mg: d. O₂ d. O₂ 1. Which compound is nonpolar molecules? b. H₂O 2. Which compound exhibit polar bonds? c. Mg-Mg 3. In which compound would metallic bond exist? a. KBr 4. Which compound exhibit ionic bond? 5. Which of the properties of atoms is the most suitable reference for the kind of bond that will take place between/among them? a. atomic size b. electronegativity c. ionization energy d. electron affinity 6. Why do atoms react with one another to form chemical bonds? a. to attain stability b. to form compounds c. to form molecules d. to produce ions 7. Which of the following substances when dissolve in water will conduct electricity? a. glucose b. oil c. gasoline d. monosodium glutamate 8. What occurs when an electron moves from high energy level to a low one? a. another electron goes from a low energy level to a high one b. the atom moves faster c. colored light is given off d. this process is not possible 9. Which of the following statements is NOT true of the atomic model of Bohr? a. Hydrogen is made up of a positively charged nucleus. b. the electron revolves around the nucleus in a circular orbit. c. The energy of the electron in a given orbit is not fixed. d. An electron can absorb or emit a quantity of radiation. 10. Which drawing best illustrates the phenomenon responsible for the colors of elements? a. b. c. d. For numbers 11-25, complete the table below with the needed information. SUBSTANCE MOLAR MASS REPRESENTATIVE MASS NUMBER OF NUMBER OF (g/mol) PARTICLE (g) MOLES PARTICLES  Carbon 44.01 Molecule =2.5 x 44.01 2.5 =2.5 x 6.02 × 10²³ Dioxide (CO2) =110.025 g =1.505× 10²⁴ Hydrogen (H) 1.01 Atom =1 x 1.01 1 =1 x 6.02 × 10²³ =1.01 g =6.02 × 10²³ Glucose (C): (6×12.01) =72.06 Molecule 360.36 =1.205x1024 / 6.02 × 10²³ 1.205x1024 (C6H12O6) (H): (12×1.008)= 12.096 =2.00 mol (O): (6×16.00)= 96.00 =72.06+12.096+96.00 = 180.156g/mol Mg(OH2) (Mg): (1x24.31)= 24.31 Formula Unit =3 x 58.33 3 =3 x 6.02 × 10²³ (O): (2 x 16.00 )= 32 =174.99 g =1.086× 10²⁴ (H): (2 x 1.01 )= 2.02 =24.31+32+2.02 = 58.33 g/mol Nitrogen Gas 28.02 Molecule 140.10 =140.10/28.02 =5 x 6.02 × 10²³ (N2) =5.00 mol =3.01× 10²⁴ For questions 26-27, refer to the following electronic configurations of atoms: a. 1S2 2S2 2p6 b. 1S2 2S2 2p4 c. 1S2 2S2 2p6 3S2 3p6 4S2 3d10 4p5 d. 1S2 2S1 26. Which one has the greatest tendency to gain electron? c. 1S2 2S2 2p6 3S2 3p6 4S2 3d10 4p5 27. Which has the tendency to give away electrons? d. 1S2 2S1 28. What kind of particle is produced after covalent bonding? a. atom b. molecule c. ion d. electron 29. Nitrogen (N) belongs to family 5A and it is diatomic. How many nonpolar covalent bonds will there be in N2 molecule? a. 1 b. 2 c. 3 d. 4 30.Which of the following type of bonds will have the highest electrical and thermal conductivity? a. ionic bond b. metallic bond c. polar covalent d. nonpolar covalent bond 31. Why can metal be hammered without breaking? a. They are ductile. b. They are not brittle. c. They are malleable. d. Their particles are strong. 32. How does ionic bonding take place? a. Two non-metallic elements of different kinds form strong forces of attraction. b. Two non-metallic element of the same kind form strong forces of attraction. c. A non-metallic element like fluorine is attracted to a metallic element like sodium. d. A metallic element like sodium transfers an electron to a non-metallic element like fluorine. 33. Which among the following shows that an atom is stable? a. having 2 valence electrons c. having 6 valence electrons b. having 4 valence electrons d. having 8 valence electrons 34. Why can metal be hammered without breaking? a. They are ductile. b. They are not brittle. c. They are malleable. d. Their particles are strong. 35. Element X belongs to Group 1. Which of the following best describes element X? a. high electronegativity c. low electronegativity b. high ionization energy d. a non-metallic element For questions 36-37, refer to the following electronic configurations of atoms: a. 1S2 2S2 2p6 b. 1S2 2S2 2p4 c. 1S2 2S2 2p6 3S2 3p6 4S2 3d10 4p5 d. 1S2 2S1 36. Which one has the greatest tendency to gain electron? c. 1S2 2S2 2p6 3S2 3p6 4S2 3d10 4p5 37. Which has the tendency to give away electrons? d. 1S2 2S1 38. Which of the following substances when dissolve in water will conduct electricity? a. glucose b. oil c. gasoline d. monosodium glutamate 39. What bond holds the atoms of the elements in Groups 1 and 2 of the periodic table? a. nonpolar covalent bond b. polar covalent bond c. metallic bond d. ionic bond 40. Why do atoms react with one another to form chemical bonds? a. to attain stability b. to form compounds c. to form molecules d. to produce ions God bless you!