ESAS- Chemistry Multisector Review 1. Formula for calcium chloride A. CaCl2 B. Ca2Cl 2. Find MW of HNO3 in g/mole. A. 72 B. 61 Solution: π»=1π₯1=1 π = 14 π₯ 1 = 14 π3 = 16 π₯ 3 = 48 1 + 14 + 48 = ππ C. CaCl D. CaCl3 C. 73 D. 63 lOMoAR cPSD| 37426445 3. What is the chemical formula of Sulfuric acid? A. HSO4 B. H2SO4 C. H3SO2 D. HSO2 4. What is the physical appearance of sodium chloride? A. Silver metal B. White crystal C. Yellowish Gas D. White metal 5. What is the oxidation number of Cr in the dichromate ion (Cr2O2) ²? A. -1 B. 0 C. 2.5 D. 6 Solution: 2π₯ + (−14) = −2 ∴πΏ=π 6. The second period contains how many elements? A. 2 B. 4 C. 6 D.8 7. The second period contains how many elements? A. 2 B. 4 C. 6 D. 8 8. Which of the following metallic element has a meaning “heavy stone”? A. Titanium B. Iron C. Cobalt D. Tungsten 9. Formula for Calcium chloride. A. CaCl2 B. Ca2Cl C. CaCl D. CaCl3 10. Battery acid is the common name for A. formic acid B. hydrochloric acid C. nitric acid 11. Calculate the volume at STP of 26.7 g of oxygen gas. A. 17.8L B. 87.1L C. 18.7L D. 78.1L D. sulphuric acid Solution: π = ππ π = ππ π @ π π‘π π = 1 ππ‘π π = 0ππΆ (101.325 πππ) (π) = (26.7 π2 π₯ 10) (8.314π½πππππ ) (0 + 273ππΎ) π = 0.0187 π3 π₯1000 πΏ π3 = ππ. π π³ 12. If the atomic weight of magnesium is 24.3 g/mol, calculate how many magnesium atoms does 5 g represent? A.1.24x10^23 atoms C. 3.44x10^23atoms D. 2.76x10^23atoms B.1.76x10^23atoms Solution: ππππππ ππ’π π΄π‘πππ =(π/ππ)/(ππππ‘ππ)= (5g/24.3 π/πππ)/ (1.673 π₯ 10−24π) = π. ππ π ππππ πππππ 13. What is another term for “acid-test ratio”? A. Current Ratio B. Quick Ratio C. Profit Margin Ratio D. Price-earning model 14. What are considered as the “building blocks” for engineering materials? A. Atoms B. Elements C. Matters D. Compounds 15. What refers to chemically combined elements with definite proportions of the component elements? A. Mixture B. Molecules C. Compound D. Alloy 16. Which of the following cannot be a property of a gas? A. Density B. Pressure C. Viscosity D. Temperature 17. The place where buyers and sellers are together. A. Density B. Pressure C. Viscosity D. Temperature 18. Which of the following is added to the drinking water distribution system for a disfunction? A. Soda ash B. Chlorine C. Lime D. Iodine 19. Which of the following refrigerant is highly toxic and flammable? A. NH2 B. CO2 C. CO3 D. R-12 20. Oxygen is converted into ozone by A. great heat B. high pressure C. electric discharge D. all of these 21.Which of the following is very reactive in its pure form? A. Na B. He C. HCl D. CO2 29. How many moles are there in 21.58 g of chloroform (CHCI3) A. 0.1608 B. 0.1806 C. 5.5352 D.5.5252 Solution: ππ ππ πΆπ»πΆπ3 = 119.35 π/πππ πππππ =π/π. π€ =21.58/ 119.35 = π. ππππ ≈ π. ππππ πππππ 30. Stainless steel resists corrosion due to A. carbon B. sulfur C. chromium D. vanadium 31.Vinegar is solution of H2O and what acid? A. sulfuric acid B. acetic acid C. phosphoric acid D. nitric acid 32. The mole is a basic unit of measurement in chemistry. Which of the following is not equal so or the same as one mole of the substance indicated? A. 22.4 liters of nitrogen gas as STP B. 6.02x1023 oxygen molecules C. 1 g of hydrogen atoms D. 16 g of oxygen molecules
