STRAIGHTERLINE CHEMISTRY FINAL EXAM-with 100% verified solutions-2023, Exams of Public Health

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STRAIGHTERLINE CHEMISTRY FINAL EXAM-with

100% verified solutions- 2023

What is the term used for findings that are summarized based on a pattern or trend? a. Law b. Hypothesis c. Theory d. Phenomena e. Prediction a. Law Which of the following is a tentative explanation for a set of observations? Select one: a. Law b. Hypothesis c. Theory d. Phenomena e. Prediction b. Hypothesis If a liquid contains 60% sugar and 40% water throughout its composition then what is it called? Select one: a. Solute b. Compound c. Homogeneous mixture d. Heterogeneous mixture

e. Solvent c. Homogeneous mixture Which of the following does not have a uniform composition throughout? Select one: a. Element b. Compound c. Homogeneous mixture d. Heterogeneous mixture e. Solvent d. Heterogeneous mixture Which one of these represents a physical change? Select one: a. Water, when heated, forms steam. b. Bleach turns hair yellow. c. Sugar, when heated, becomes brown. d. Milk turns sour. e. Apples, when exposed to air, turn brown. a. Water, when heated, forms steam. How many micrograms are in 65.3 kg? Select one: a. 0.653 μg b. 6.53 × 107 μg c. 6.53 × 104 μg d. 6.53 × 10-8 μg

e. 6.53 × 1010 μg e. 6.53 × 1010 μg A smart phone has dimensions of 4.9 inches (height), 2.3 inches (width) and 8. millimeters (depth). What is the volume of the smart phone in cubic centimeters? ( in = 2.54 cm) Select one: a. 58 cm b. 1.7 x 105 cm c. 90 cm d. 3.4 cm e. 34 cm a. 58 cm 3 Given that 1 inch = 2.54 cm, 1.00 cm3 is equal to Select one: a. 16.4 in b. 6.45 in c. 0.394 in d. 0.155 in e. 0.0610 in e. 0.0610 in What terms defines a mass which is exactly equal to 1/12 the mass of one carbon- 12 atom? Select one: a. Isotope number b. Mass number

c. Mass-to-charge ratio d. Atomic number e. Atomic mass unit e. Atomic mass unit How many neutrons are there in an atom of lead whose mass number is 208? Select one: a. 82 b. 126 c. 208 d. 290 e. none of them b. 126 Which of these elements is chemically similar to magnesium? Select one: a. Sulfur b. Calcium c. Iron d. Nickel e. Potassium b. Calcium

We have an expert-written solution to this problem! C(graphite) and C(diamond) are examples of: Select one: a. isotopes of carbon. b. allotropes of carbon. c. the law of definite proportions. d. different carbon ions. b. allotropes of carbon. The 80Br- ion has Select one: a. 45 protons, 35 neutrons, 45 electrons. b. 35 protons, 45 neutrons, 34 electrons. c. 35 protons, 45 neutrons, 36 electrons. d. 45 protons, 35 neutrons, 46 electrons. e. 35 protons, 45 neutrons, 46 electrons. e. 35 protons, 45 neutrons, 46 electrons. The formula for sodium sulfide is Select one: a. NaS b. K2S c. NaS d. Na2S

e. SeS d. Na2S Which one of the following formulas of ionic compounds is the least likely to be correct? Select one: a. NH4Cl b. Ba(OH) c. Na2SO d. Ca2NO e. Cu(CN) d. Ca2NO What is the name of ClO - ion? Select one: a. hypochlorite b. chlorate c. chlorite d. perchlorate e. perchlorite a. hypochlorite Which of the following is a molecular formula for a compound with an empirical formula of CH? Select one:

a. C2H b. C3H c. C4H d. C6H e. None of the answers is correct. d. C6H Which is the correct electron configuration for gold? Select one: a. [Xe]4f145d96s b. [Xe]4f145d106s c. [Xe]4f135d106s d. [Xe]4f145d106s e. None of the electron configurations is correct. d. [Xe]4f145d106s A(n) _________ is a point at which a standing wave has zero amplitude. Select one: a. crevice b. node c. pit d. burrow e. orbital b. node

The Pauli exclusion principle states that no ____ electrons within an atom can have the same ____ quantum numbers. Select one: a. 4; 6 b. 2; 4 c. 3; 6 d. 6; 10 e. 3; 8 b. 2; 4 Emission spectra Select one: a. cannot be used to identify an unknown atom. b. can be used to identify unknown atoms. c. can be explained by the movement of protons colliding with electrons. d. none of the. b. can be used to identify unknown atoms. Which one of the following equations correctly represents the process relating to the ionization energy of X? Select one: a. X(s) → X+(g) + e- b. X2(g) → X+(g) + X-(g) c. X(g) + e- → X-(g)

d. X-(g) → X(g) + e- e. X(g) → X+(g) + e- e. X(g) → X+(g) + e- Consider the element with the electron configuration [Kr]5s24d105p5. This element is Select one: a. a halogen. b. a transition metal. c. an alkali metal. d. an actinide element. e. a noble gas. a. a halogen. Consider the element with the electron configuration [Kr]5s24d7. This element is Select one: a. a halogen. b. a transition metal. c. a nonmetal. d. an actinide element. e. a noble gas. b. a transition metal. How does atomic radius change as you move across the periodic table? Select one:

a. Atomic radius decreases moving from left to right across a period and increases from top to bottom. b. Atomic radius increases moving left to right across a period and decreases from top to bottom. c. Smaller nuclear charge lowers energy; more electrons in an orbital lowers energy. d. Atomic radius increases diagonally across the periodic table. e. None of the answers is correct. a. Atomic radius decreases moving from left to right across a period and increases from top to bottom. Which of these choices is the electron configuration of the iron(III) ion? Select one: a. [Ar]3d b. [Ar]4s13d c. [Ar]4s23d d. [Ar]3d e. [Ar]4s23d a. [Ar]3d An element with the general electron configuration for its outermost electrons of ns2np1 would be in which element group? Select one: a. 2A b. 3A c. 4A d. 5A e. 8A

b. 3A The effective nuclear charge for an atom is less than the actual nuclear charge due to Select one: a. shielding. b. penetration. c. paramagnetism. d. electron-pair repulsion. e. relativity. a. shielding. Which pair of ions exhibits the greatest attractive force between them? Select one: a. Na+ and Cl- b. Ca2+ and Cl- c. Na+ and S2- d. Al3+ and Mg2+ e. Mg2+ and O2- e. Mg2+ and O2- Which of the following is a basic oxide? Select one: a. P4O b. MgO

c. Al2O d. SO e. Cl2O b. MgO Which of these compounds is most likely to be covalent? Select one: a. Rb2S b. SrCl c. CS d. CaO e. MgI c. CS In the Lewis structure of the iodate ion, IO3-, that satisfies the octet rule, the formal charge on the central iodine atom is Select one: a. 2. b. 1. c. 0. d. - 1. e. - 2. a. 2.

Which molecule has the largest dipole moment? Select one: a. HF b. HI c. HBr d. HCl e. All of the molecules have the same dipole moment. a. HF In which of the following species does the central atom violate the octet rule? Select one: a. CH b. SF c. PCl4+ d. CCl3+ e. NH b. SF Which of these ionic solids would have the largest lattice energy? Select one: a. NaCl b. NaF c. CaBr d. CsI

e. CaCl e. CaCl The total number of bonding electrons in a molecule of formaldehyde (H2CO) is Select one: a. 3. b. 4. c. 6. d. 8. e. 18. d. 8. We have an expert-written solution to this problem! Which of the following molecules has a nonzero dipole moment? Select one: a. BeCl b. SF c. KrF d. CO e. CCl b. SF According to the VSEPR model, a molecule with the general formula AB5 with one lone pair on the central atom will have a ______ molecular geometry.

Select one: a. tetrahedral b. trigonalbipyramidal c. square pyramidal d. octahedral e. seesaw c. square pyramidal Which is the most reasonable prediction for the three F-Br-F bond angles in BrF3? Select one: a. 90°, 90°, and 180° b. 86°, 94°, and 180° c. 86°, 86°, and 172° d. 94°, 94°, and 172° e. 120°, 120°, and 120° c. 86°, 86°, and 172° When PCl5 solidifies it forms PCl4+cations and PCl6- anions. According to valence bond theory, what hybrid orbitals are used by phosphorus in the PCl4+cation? Select one: a. sp b. sp c. sp d. sp3d e. sp3d c. sp

What is the number of lone electron pairs on the central atom of a molecule having a trigonal pyramidal molecular geometry, such as NH3? Select one: a. 1 b. 2 c. 3 d. 0 e. 4 a. 1 For which one of the following molecules is the indicated type of hybridization not appropriate for the central atom? Select one: a. BeCl2; sp b. SiH4; sp c. BF3; sp d. C2H2; sp e. H2O; sp a. BeCl2; sp According to the VSEPR model, the predicted molecular geometry of ammonia, NH3, is Select one: a. linear. b. trigonal planar.

c. bent. d. tetrahedral. e. trigonal pyramidal. e. trigonal pyramidal. What is the mass of one copper atom? (NA = 6.022 × 1023 mol-1) Select one: a. 1.055 × 10-22 g b. 63.55 g c. 1 amu d. 1.66 × 10-24 g e. 9.476 × 1021 g a. 1.055 × 10-22 g What is the percent sulfur in iron(III) sulfate? Select one: a. 28% b. 32% c. 24% d. 48% e. 42% c. 24% Proteins found in humans are polymers that consist of different combinations of 20 amino acids. Proline, one of the 20 amino acids, has the molecular formula,

C5H9NO2. If a human protein has 25 proline monomers, how many carbon atoms from proline are present in the protein? Select one: a. 4 C atoms b. 25 C atoms c. 40 C atoms d. 100 C atoms e. 125 C atoms e. 125 C atoms Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3. Select one: a. 2.377 mol b. 2.146 mol c. 1.105 mol d. 0.4660 mol e. 0.4207 mol d. 0.4660 mol Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.)

__ SF4 + __ H2O → __ H2SO3 + __ HF

Select one: a. 4 b. 6 c. 7 d. 9 e. None of these answers is correct. d. 9 What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr2O3 with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr2O3 → Al2O3 + 2Cr Select one: a. 7.7 g b. 15.4 g c. 27.4 g d. 30.8 g e. 49.9 g b. 15.4 g Which one of the following is a strong acid? Select one: a. CH3COOH b. H2SO c. NH

d. H3PO e. HClO e. HClO Which is a Lewis acid? Select one: a. CH3NH b. BCl c. F- d. BF4- e. CH b. BCl Which is an amphoteric oxide? Select one: a. Na2O b. MgO c. Al2O d. SO e. Cl2O c. Al2O What is the value of the equilibrium constant for the autoionization of water at 25°C? Select one:

a. 1.0 × 10- 7 b. 1.0 × 10- 14 c. 1.0 × 1014 d. 1.0 × 107 e. 14 b. 1.0 × 10- 14 Which is the strongest acid? Select one: a. SO42- b. H2SO3 c. H2SO4 d. HSO4- e. HSO3- C. H2SO4 In the van der Waals equation, the constant b is a constant that is part of a correction factor for _________. Select one: a. the volume of the gas b. the temperature of the gas c. the pressure of the gas d. the ideal gas constant a. the volume of the gas

A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature? Select one: a. 22.3 L b. 31.2 L c. 44.9 L d. 112 L e. 380 L b. 31.2 L If the atmospheric pressure in Denver is 0.8800 atm, what is this pressure expressed in mmHg? (1 atm = 101,325 Pa = 760 torr, 1 torr = 1 mmHg)? Select one: a. 151.5 mmHg b. 1.16 × 10-3 mmHg c. 863.6 mmHg d. 8.92 × 104 mmHg e. 668.8 mmHg e. 668.8 mmHg What are the conditions of STP? Select one: a. 0 K and 1 atm b. 273.15 K and 760 torr c. 0°C and 760 atm d. 273.15°C and 760 torr

e. 0°C and 1 torr b. 273.15 K and 760 torr In the van der Waals equation, the constant a is a constant that is part of a correction factor for _________. Select one: a. the volume of the gas b. the temperature of the gas c. the pressure of the gas d. the ideal gas constant c. the pressure of the gas Which substance will exhibit hydrogen bonding between molecules? Select one: a. (CH3)3N b. CH3-O-CH3 c. CH3CH2-OH d. CH3CH2-F e. HI c. CH3CH2-OH Which of the following statements is true? Select one: a. The higher the viscosity, the faster a liquid flows. b. The viscosity increases with increasing temperature.

c. The stronger the intermolecular forces, the higher the viscosity. d. Hydrogen bonding in water gives rise to its unusually low viscosity. e. The viscosity of gases is larger than the viscosity of liquids. c. The stronger the intermolecular forces, the higher the viscosity. If liquid bromine is cooled to form a solid, which type of solid does it form? Select one: a. atomic b. metallic c. molecular d. ionic e. covalent c. molecular In a sample of hydrogen iodide, __________________ are the most important intermolecular forces. Select one: a. dipole-dipole forces b. London dispersion forces c. hydrogen bonding d. covalent bonds e. polar covalent bonds a. dipole-dipole forces Krypton has a higher melting point than argon because of its

Select one: a. hydrogen bonding. b. stronger dispersion forces. c. permanent dipole moment. d. ionic bonds. e. greater ionization energy. b. stronger dispersion forces. Lead crystallizes in the face-centered cubic lattice. What is the coordination number for Pb? Select one: a. 4 b. 6 c. 8 d. 10 e. 12 e. 12 We have an expert-written solution to this problem! What states that the solubility of a gas in a liquid is proportional to the pressure of the gas over the solution? Select one: a. Entropy b. Henry's law c. Dissolution d. Vapor pressure