University:
Kentucky State University
Course:
CHE 101 | General Chemistry I
Academic year:

2022
Views:

410

Pages:

30
Author:

crawniadxfo

1- One amu is equal to A. 1/24 the mass of C-14 B: 1/12 the mass of C-12 C. 1/12 the mass of Ne D. 1/24 the mass of Ne E. 1/8 the mass of 0-16 2- On a planet in another galaxy, tellurium exists as only two isotopes, Te-123 and Te-130. The masses and abundances of these jsotopes on the planet are 122.90 amu and 15.000% abundance for Te-123, and 129.91 amu and 85.000% abundance for Te-130. What is the average atomic mass of tellurium on the planet? A12 A. 128.86 amu Te12 129.90 15 B. 126.41 amu C. 127.60 amu D. 64.43 amu E. 63.80 amu 3- Which of the following statements is true according to the chemical reaction shown below? 2H2 + O2 -> 2H₂O A: Two molecules of hydrogen are reacting to yield 2 molecules of water. B. One molecule of oxygen is reacting with 4 molecules of hydrogen. C. One molecule of oxygen is reacting to yield 1 molecule of water. Two hydrogen atoms are reacting to yield 2 atoms of water. Two molecules of oxygen are reacting with 4 hydrogen atoms 4- Which of the following statements is true according to the chemical reaction shown below? CH, +20₂→ CO2 + 2H2O A. Carbon dioxide and water react to give methane and oxygen. B. Carbor monoxide and water are the products of the reaction of methane and oxygen. C. Methane and oxygen react to give carbon dioxide and water in a ratio of 1 molecule of Which of the following numbers contains at least one zero that is not significant? A..205 B. 210 C. 10.200 D. 200.201 E0700- 7) Which of the following is not one of the seven basic Sl unit: A. kilogramus! (B) liter C. second Time D. kelvinewpr E. mole 8) A column of liquid is found to expand linearly on heating. It expands 5.25 cm for a 10.0°F rise in temperature. If the initial temperature of the liquid is 98.6°F, what will be the final temperature in °C, if the liquid has expanded by 18.5 cm? 50% A. 37.0°C 15.5x B. 72.2°C X 35.24 C. 19.6°C (D) 56.6°C E. 45.8°C 9) A person walks about 10 cm per day. How many picometer: does this person walk each day? A. 1010 pm B. 1012 pm C: 1016 pm D. 10-16 pm E. 103 pm 11 **12. All of the following compounds are soluble in water except:** a. NH4Cl b. Fe(NO3)3 c. HgI2 d. CuCl2 e. Ba(OH)2 **13. Which of the following conversions involves oxidation:** a. H2O2 -> H2O b. Ti3+ -> TiO2+ c. BF3 -> BF4- d. H2 -> H2O e. Fe2+ -> Fe3+ **14. The net ionic equation for the reaction of nitrous acid with lithium hydroxide is:** a. HNO2(aq) + LiOH(aq) -> LiNO2(aq) + H2O(l) b. H+(aq) + OH-(aq) -> H2O(l) c. H+(aq) + NO2-(aq) + Li+(aq) + OH-(aq) -> Li+(aq) + NO2-(aq) + H2O(l) d. HNO2(aq) + OH-(aq) -> NO2-(aq) + H2O(l) e. HNO2(aq) + OH-(aq) -> NO2-(aq) + H2O(l) **15. After balancing the following chemical reaction in Basic solution, the correct ratio of I2 to MnO4- is:** MnO4- + I- -> MnO2 + I2 a. 6/8 b. 8/10 c. 4/3 d. 4/2 e. 3/2 **16. The volume in milliliters (ml) of 0.675 M NaOH required to neutralize 35.0 ml of 0.145 M H3PO4 is equal to:** a. 5.37 b. 16.1 c. 22.6 d. 10.7 e. 16.9 **How many sulfur atoms are contained in 9.96 mg (0.00996 g) of Na₂SO₃? The molar mass of Na₂SO₃ is 126.05 g/mol.** a. 4.76 × 10¹⁹ b. 4.76 × 10²⁰ c. 9.51 × 10²³ d. 1.05 × 10²¹ e. 9.52 × 10²⁰ **The mass percent of oxygen in Al₂(SO₄)₃ is equal to** a. 28.1% b. 9.37% c. 42.7% d. 21.4% e. 56.1% **The empirical formula for a compound that contains 25.00% C, 8.33% H, and 66.67% O is:** a. C₂H₆O b. CHO c. C₄H₁₃O₂ d. CH₄O₂ e. CH₂O **Consider the following balanced reaction. How many grams of NO₂ are required to form 4.50 g of NO? Assume that there is excess water present.** 3NO₂(g) + H₂O(l) → 2HNO₃(aq) + NO(g) a. 38.0 g b. 69.0 g c. 20.7 g d. 10.9 g e. 26.5 g **Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be produced from the reaction of 50.0 g of N₂O₄ with 45.0 g N₂H₄, assuming 100% yield. The molar masses are as follows: N₂O₄ = 92.02 g/mol, N₂H₄ = 32.05 g/mol.** 2N₂O₄ + N₂H₄ → 3N₂ + 4H₂O a. LR is N₂O₄, 45.0 g N₂ formed b. LR is N₂O₄, 105 g N₂ formed c. LR is N₂H₄, 13.3 g N₂ formed d. LR is N₂H₄, 59.0 g N₂ formed e. Both reactants are in appropriate stoichiometric ratios and 45.0 g N₂ formed