Download Chem 121 Final Exam (Actual Exam 2025) | Featuring Topics such as Atomic Structure and more Exams Chemistry in PDF only on Docsity!
Chem 121 Final Exam (Actual Exam 2025 ) |
Featuring Topics such as Atomic Structure,
Periodic Trends, Stoichiometry, Chemical
Bonding, Gas Laws, Solutions, and
Thermochemistry
What is the formula of aluminum sulfide? A. AlSO B. AlS C. Al2(SO4) D. Al2S3 ---------CORRECT ANSWER-----------------D Which is the formula of iron(II) nitrate? A. Fe(NO3) B. Fe3NO C. Fe2NO D. FeNO3 ---------CORRECT ANSWER-----------------A Which of the following is the formula for dinitrogen tetroxide? A. N2O
B. N4O
C. N2O
D. NO2 ---------CORRECT ANSWER-----------------A
HClO is named? A. chloric acid. B. hypochlorous acid. C. perchloric acid. D. chlorous acid. ---------CORRECT ANSWER-----------------B How many molecules are present in 4.00 mol of Cl2? a. 2.84 x 1025 molecules b. 2.41 x 1024 molecules c. 1.51 x 1023 molecules d. 7.09 x 1024 molecules ---------CORRECT ANSWER-----------------B What is the molar mass of sodium chloride? a. 67.53 g b. 6.02 x 1023 g c. 1.00 g d. 58.44 g ---------CORRECT ANSWER-----------------D
d. CHO2 ---------CORRECT ANSWER-----------------A What is the molecular formula of a compound with the empirical formula CH2Cl and molar mass of 98.96 g? a. C3H6Cl b. C2H4Cl c. C4H8Cl d. CH2Cl ---------CORRECT ANSWER-----------------B One mole of glucose, C6H12O6, contains 24 atoms. a. True b. False ---------CORRECT ANSWER-----------------B The limiting reactant in a chemical reaction is the reactant which is completely consumed. a. True b. False ---------CORRECT ANSWER-----------------A A mole ratio is the ratio between the number of moles of any two species involved in the chemical reaction.
a. True b. False ---------CORRECT ANSWER-----------------A The distance between two consecutive wave peaks is known as a. frequency. b. wavelength. c. amplitude. ---------CORRECT ANSWER-----------------B How many orbitals are contained in the 3d sublevel? a. 2 b. 5 c. 7 d. 10 ---------CORRECT ANSWER-----------------B The maximum number of electrons that can fit into a single d orbital is a. 2. b. 6. c. 10. d. 14. ---------CORRECT ANSWER-----------------A
The electron configuration, [Ar] 4s 1 , is the ground state electron configuration of a. potassium. b. sodium. c. phosphorous. d. fluorine. ---------CORRECT ANSWER-----------------A Which of the following 3rd period elements has the smallest atomic radius? a. S b. Cl c. Na d. Al ---------CORRECT ANSWER-----------------B How many valence electrons are present in an atom of carbon in the ground state? a. 1 b. 8 c. 4 d. 2 ---------CORRECT ANSWER-----------------C
A Ca+2 ion has an electron configuration similar to that of a. xenon. b. neon. c. argon. d. krypton. ---------CORRECT ANSWER-----------------C Which of the following bonds is most polar? Electronegativity values: F=4.0, O=3.5,N=3.0, Br=2.8, C=2.5. a. O―F b. N―F c. Br―F d. C―F ---------CORRECT ANSWER-----------------D Which structure represents the best Lewis structure for O2? a. 6- 4 b. 5- 5 c. 3--- 3
b. 400. mL c. 18.8 mL d. 214 mL ---------CORRECT ANSWER-----------------D What is the volume of 0.132 mol of carbon dioxide gas at STP? a. 333 L b. 2.96 L c. 5.81 L d. 170. L ---------CORRECT ANSWER-----------------B The total number of molecules contained in 22.4 L of nitrogen gas at STP is ___. a. 6.023 × 10-23 molecules b. 22.4 molecules c. 6.023 × 1023 molecules d. 1 molecule ---------CORRECT ANSWER-----------------C At which pressure would a 2.60 mol sample of gas at 20.0°C have a volume of 25.0 L? a. 15.8 atm
b. 0.171 atm c. 2.08 atm d. 2.50 atm ---------CORRECT ANSWER-----------------D What volume of oxygen is consumed when 3.00 mol of carbon monoxide is produced in the following equation at STP? 2 C(s) + O2(g) 2 CO(g) a. 33.6 L b. 22.4 L c. 67.2 L d. 1.50 L ---------CORRECT ANSWER-----------------A The high boiling point of water is due to a. hydrogen bonds. b. polar covalent bonds. c. nonpolar covalent bonds. d. ionic bonds. ---------CORRECT ANSWER-----------------A A tentative explanation of certain facts that provides the basis for further experimentation is
Perform the following set of operations and choose the alternative that expresses the result to the proper number of significant figures. ((1.5 × 10-4 ) x (61.3)) + 2. A. 2. B. 2. C. 2. D. 2.02 ---------CORRECT ANSWER-----------------D If you travel to Canada, speed limits are posted in km/hr. For a speed limit of 70. mi/hr, what would be the speed limit posted on a Canadian highway? (1 mile = 1.609 km) A. 72 km/hr B. 110 km/hr C. 44 km/hr D. 68 km/hr ---------CORRECT ANSWER-----------------B The temperature of 295 K is equal to which Fahrenheit temperature? A. 32 °F
B. 72 °F
C. 44 °F
D. 41 °F ---------CORRECT ANSWER-----------------B
A 48.0-g piece of metal is dropped into 50.0 mL of water in a graduated cylinder. The water level rises to 62.4 mL. What is the density of the metal? A. 12.4 g/mL B. 0.258 g/ml C. 595 g/ml D. 3.87 g/mL ---------CORRECT ANSWER-----------------D Which element is solid at room temperature and a good conductor of heat and electricity? A. Phosphorus B. Calcium C. Hydrogen D. Boron ---------CORRECT ANSWER-----------------B Which element forms a diatomic molecule? A. Neon
C. conservation reaction. D. none of these choices ---------CORRECT ANSWER-----------------A In the reaction 3Ag(s) + 4HNO3(aq) → 3AgNO3(aq) + NO(g) + 2H2O(l) The reactants are: A. AgNO3(aq), NO(g) B. Ag(s), HNO3(aq) C. HNO3(aq), H2O(l) D. AgNO3(aq), NO(g), H2O(l) ---------CORRECT ANSWER-----------------B 15.6 g of a metal absorbs 836.8 J of heat energy that raises its temperature by 21 oC. What is the specific heat of the metal? A. 0.39 J/goC B. 620 J/goC C. 1100 J/goC D 2.6 J/goC ---------CORRECT ANSWER-----------------D How many joules of energy are released when 45.
g of water cools from 18.0 oC to 7.0 oC? A. 495 J B. 791 J C. 2070 J D. 2860 J ---------CORRECT ANSWER-----------------C What subatomic particles contribute to the charge of the atom? A. proton and neutron B. neutron and electron C. electron and proton D. proton, electron, and neutron ---------CORRECT ANSWER-----------------C The element with atomic number 53 is ___. A. indium B. iron C. iodine D. iridium ---------CORRECT ANSWER-----------------C An isotope of sodium has a mass number of 23. What is the number of neutrons for this isotope?
A. 10.00 amu B. 62.97 amu C. 20.99 amu D. 20.18 amu ---------CORRECT ANSWER-----------------D The mass of a copper atom is 1.045 × 10 - 22 g. How many copper atoms are present in a 94.5 g sample of copper? A. 94. B. 9.04 × 10 23 C. 1.045 × 10 - 22 D. 1870 ---------CORRECT ANSWER-----------------B The mole is 6.022 x 1023 particles. a. True b. False ---------CORRECT ANSWER-----------------A Given the unbalanced equation: C6H6 + O2 CO2 + H2O. When properly balanced, the coefficient of oxygen is a. 1.
b. 9. c. 12. d. 15. ---------CORRECT ANSWER-----------------D The following reaction: Mg + FeO MgO + Fe, is an example of a. combination. b. single-displacement. c. double-displacement. d. decomposition. ---------CORRECT ANSWER-----------------B The following reaction: LiOH + HCl LiCl + H2O, is an example of a. single-displacement. b. combination. c. decomposition. d. double-displacement. ---------CORRECT ANSWER-----------------D The following reaction: 2FeO 2Fe + O2, is an example of a. combination.
