Science 9 2nd Quarter Final RUQA PDF

REGIONAL UNIFIED QUARTERLY ASSESSMENT (RUQA) SY 2024-2025 Second Quarter – Grade 9 Science GENERAL INSTRUCTIONS. Do not write anything on this test paper. After carefully reading all the questions, reflect all your answers on the separ...

REGIONAL UNIFIED QUARTERLY ASSESSMENT (RUQA) SY 2024-2025 Second Quarter – Grade 9 Science GENERAL INSTRUCTIONS. Do not write anything on this test paper. After carefully reading all the questions, reflect all your answers on the separate ANSWER SHEET. Shade the circle that corresponds to your chosen answer. 1. Who among the scientists did not contribute to the development of the quantum mechanical model of the atom? A. Werner Karl Heisenberg C. Erwin Schrodinger B. Louie de Broglie D. Neils Bohr 2. How many electrons can each p orbital hold? A. 1 B. 2 C. 4 D.6 3. Which orbital designation has the highest energy? A. 2p B. 3p C.3d D. 4s 4. What happens when an electron jumps from a higher to a lower energy level? A. colored light is given off B. the atom becomes excited C. another electron goes from a low energy level to a high one D. this process is not possible 5. Which statement below supports Bohr’s model of the atom? A. The model accounted for the absorption spectra of atoms but not for the emission spectra. B. The model was accounted for describing the electron to be moving in definite orbits around the nucleus. C. The model was based on the wave properties of the electron. D. The model accounted for the emission spectra of atoms, but not for the absorption spectra. 6. What is wrong with the electron configuration 1s21p62s23p1 A. too many electrons in 1s C. there is no 1p orbital B. the 2s orbital can hold 3 electrons D. the 2p orbital is not filled. 7. Which of the following best describes the quantum mechanical model of the atom? A. Atom shows that electrons are not limited to fixed orbits around the nucleus. B. Atom has its nucleus at the center where the electrons move, a region in space where the electron is most likely to be found. C. Atom shows that electrons and protons are not limited to fixed orbits around the nucleus D. Atom has its nucleus at the center where the protons and neutrons move. 8. Which of the following pairs of atoms is most likely to form a covalent compound? A. C, O B. Na, O C. Mg, Br D. Ba, Cl 9. Cesium is located in period 7, family 1A in the periodic table of elements. It is the element with the highest ionization energy. How many valence electrons does cesium have? A. 1 B.2 C. 6 D. 7  2 10. Which is not a type of chemical bonding? A. covalent bonding B. Ionic bonding C. Metallic bonding D. Polar bonding 11. The following describes ionic bonding, except _____. A. Atoms either gain or lose electrons C. It involves the transfer of electrons B. It involves the sharing of electrons D. It is a bond between a metal and a non-metal 12. Which of the following are the properties of covalent compounds? I. It is soft and flexible II. It conducts electricity in a solution III. It does not conduct electricity both in a solid phase and in a solution. IV. It may exist as solid, liquid, or gas at normal atmospheric pressure and temperature A. I and II only C. I, II, and III only B. II and III only D. I, III, and IV only 13. What is the nature of the substances described in the table? A. They are ionic compounds and have high melting points. B. They are ionic compounds and have low melting points. C. They are covalent compounds and have low melting points. D. They are covalent compounds and have high melting points. 14. Which of the following statements BEST explains why covalent compounds do not conduct electricity when dissolved in water? A. Covalent compounds have lower melting points. B. Covalent compounds are weakly bonded. C. Covalent compounds dissolve into molecules. D. Covalent compounds don’t dissolve in water since they are composed of non-polar molecules. 15. What do we mean by stable configuration? A. having 5 electrons in the outermost shell B. having 6 electrons in the outermost shell C. having 7 electrons in the outermost shell D. having 8 electrons in the outermost shell 16. Which atom is most likely to form a 3+ ion? A. Al B. Kr C. Li D. Si 17. When writing the chemical formula for an ionic compound, which will you write first? A. Positive ion C. Charge of the ion B. Negative ion D. Subscript of the ion 18. What do you call the ion which carries a negative charge in its atom? A. Anions C. Polyatomic ions B. Cations D. Polymers ion 19. Why do atoms tend to lose or gain electrons during chemical bonding? A. to attain beauty C. to become reactive B. to attain stability D. to attain malleability 20. Which LEDS is the correct structure for Chlorine (Cl)? D  3 21. During the experiment, a scientist found out the following characteristics of elements. As a scientist, which do you think are the metals in the results of the experiment as stated in the Table above? A. A and B C. B and C B. A and D D. B and D 22. What is the common use of methane? A. disinfectant C. artificial ripening agent B. fertilizer D. fuel 23. Jenny’s car stopped in the middle of the road. She found out that her car had run out of fuel. Which compound must she buy? A. kerosene C. lubricating oil B. Gasoline D. water 24. Mercy told her grandson, Miguel, never to play with gasoline. Why do you think she does not allow him to do it? A. because gasoline is volatile C. because gasoline is viscous B. because gasoline is flammable D. all of the above 25. Emmanuel cuts his finger accidentally when he is cutting his nails. He has to apply something to his wound so that it will not get infected. Which compounds should he use? A. formalin C. kerosene B. isopropyl alcohol D. acetone 26. Why is it important to know the properties of common liquid materials? A. To know the uses of the liquids B. To know the possible danger from these kinds of material C. To know how these liquids affect people D. all of the above 27. Which of the following are the main compositions of organic compounds? A. carbon and hydrogen C. oxygen and hydrogen B. carbon and oxygen D. carbon, hydrogen, and oxygen 28. How many types of bonds are there in the following hydrocarbon compound? A.1 B. 2 C. 3 D. 4 29. Which is responsible for the distinctive odors and flavors of many flowers, perfumes, and ripe fruits? A. Esters B. Ethers C. Alcohol D. Aldehyde 30. Formaldehyde is an aldehyde with the formula HCHO, a colorless gas with a pungent and irritating odor. Which of the following is NOT a use of formaldehyde? A. Used to sterilize soil C. Preservation of tissue specimens B. Embalming bodies D. Fermenting corn or molasses 31. What is the usual use of methane? A. car ventilator B. fertilizer C. fuel D. pesticide  4 32. Which hydrocarbon compound contains a double bond within the atom? A. ethene B. methane C. propene D. propyne 33. Which is true about the use of isopropyl alcohol? I. Cleaner II. Fuel III. Disinfectant IV. Pesticide A. I and II only B. I and III only C. III and IV only D. I and IV only 34. Which hydrocarbon is commonly used in disposable lighters and fuel canisters for gas camping stoves and lanterns? A. Butane B. Ethyne C. Pentane D.Propene 35. Michelle told her grandson, Miguel, never to play with gasoline. Why do you think she does not permit him to do it? A. Gasoline is explosive C. Gasoline is dangerous B. Gasoline is flammable D. All of the above 36. What is the equivalent of one Mole of a substance? A. molar mass B. atomic mass C. electron mass D. neutron mass 37. Avogadro’s number represents the number of atoms in _____. A. 12g of C12 B. 320g of sulfur C. 32g of oxygen D. 12.7 g of iodine 38. The mass of carbon present in 0.5 mole of K4[Fe(CN)6] is A. 1.8g B. 18g C. 3.6g D. 36g 39. A compound contains 6.0g of carbon and 1.0g of hydrogen. What is the percentage composition of the compound? A. 14% hydrogen and 86% carbon C. 17% hydrogen and 83% carbon B. 86% hydrogen and 14% carbon D. 83% hydrogen and 17% carbon 40. What percentage of sulfur in sulfur dioxide (SO2)? A. 2.8% B. 18% C. 25% D. 50% 41. What is the percent composition of oxygen in CaO? A 16% B. 29% C. 40% D. 50% 42. An organic compound contains 12.8% C, 2.1% H and 85.1% Br by mass. What is its empirical formula? A. CHBr B. CH2Br C. CHBr2 D. C2H4Br2 43. What is the molecular formula of the compound in No.42 if the molecular mass is 188? A. CHBr B. CH2Br C. CHBr2 D. C2H4Br2 44. What is the percent composition of oxygen in Al2(SO4)3? A. 56% B. 33% C. 12% D. 5% 45. Calcium and phosphorus are important components of healthy bones and teeth. What is the empirical formula of a compound which is 66.0% Ca and 34.0% P? A. P2Ca3 B. Ca3P2 C. PCa D. CaP Read the text carefully and answer the questions for numbers 46-47. Sodium chloride (NaCl), or commonly known as the Table Salt is a compound that is used in food preservation as a food flavoring and a preservative. Each element present in the table salt contains the following atomic masses:Na=22.99g and Cl=35.45 g. 46. What is the total mass of sodium chloride? A. 22.99g B. 35.45g C.58.44g D. 81.43g  5 47. What is the percentage composition of sodium and chlorine in sodium chloride? A. Na is 39.34% and Cl is 60.66% C. Na is 60.66% and Cl is 39.34% B. Na is 22.99% and Cl is 77.01% D. Na is 77.01% and Cl is 22.99% 48. To determine the percentage composition of a compound, the following procedures should be done EXCEPT ___. A. Find the molar mass of the compound by adding up the masses of each atom in the compound using the periodic table. B. Calculate the mass due to the component in the compound by adding up the mass of these atoms. C. Divide the mass due to the component by the total molar mass of the compound and multiply by 100. D. Multiply the mass due to the component by the total molar mass of the compound and divide by 100. 49. What percentage of the mass of ammonium nitrate is nitrogen? (The formula of ammonium nitrate is NH4NO3, relative atomic mass: H=1, O=16, N=14). A. 60% Nitrogen B. 5% Nitrogen C. 35% Nitrogen D. 100% Nitrogen 50. When a mixture of 38 g of CS2 reacts with 40 g of CaO in the reaction below. What is the limiting reagent and the excess reagent? CS2 + 2CaO → CO2 + 2CaS A. Limiting reagent is CaO, excess reagent CS2 C.Limiting reagent is CO2, excess reagent CS2 B. Limiting reagent is CS2, excess reagent CaO D.Limiting reagent is CaS, excess reagent CS2