Straighterline Chemistry Final With Complete Solution 100- Verified.Straighterline Chemistry Final With Complete Solution 100- Verified.Straighterline Chemistry Final With Complete Solution 100- Verified.Straighterline Chemistry Final With Complete Solution 100- Verified.Straighterline Chemistry Fi...
Straighterline Chemistry Final With Complete
Solution 100% Verified
findings that are summarized based on a pattern or trend - Correct Answer - Law
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tentative explanation for a set of observations - Correct Answer - Hypothesis
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If a liquid contains 60% sugar and 40% water throughout its composition then what is it called? - Correct
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tAnswer - Homogeneous mixture t t t
does not have a uniform composition throughout - Correct Answer - Heterogeneous mixture
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represents a physical change? - Correct Answer - Water, when heated, forms steam.
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How many micrograms are in 65.3 kg? - Correct Answer - e. 6.53 × 1010 μg
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A smart phone has dimensions of 4.9 inches (height), 2.3 inches (width) and 8.0 millimeters (depth).
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What is the volume of the smart phone in cubic centimeters? (1 in = 2.54 cm) - Correct Answer - 58 cm3
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Given that 1 inch = 2.54 cm, 1.00 cm3 is equal to - Correct Answer - 0.0610 in3
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What terms defines a mass which is exactly equal to 1/12 the mass of one carbon-12 atom? - Correct
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Answer - Atomic mass unit
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How many neutrons are there in an atom of lead whose mass number is 208? - Correct Answer - 126
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Which of these elements is chemically similar to magnesium? - Correct Answer - Calcium
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C(graphite) and C(diamond) are examples of: - Correct Answer - allotropes of carbon.
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The 80Br- ion has - Correct Answer - 35 protons, 45 neutrons, 46 electrons.
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The formula for sodium sulfide is - Correct Answer - Na2S
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Which one of the following formulas of ionic compounds is the least likely to be correct? - Correct
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Answer - Ca2NO3
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What is the name of ClO - ion? - Correct Answer - hypochlorite
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Which of the following is a molecular formula for a compound with an empirical formula of CH? - Correct
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Answer - C6H6
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,What is the energy in joules of a mole of photons associated with red light of wavelength 7.00 × 102 nm?
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(c = 3.00 × 108 m/s; h = 6.63 × 10-34 J • s; NA = 6.022 × 1023 /mole) - Correct Answer - 1.71 × 105 J
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Which is the correct electron configuration for gold? - Correct Answer - [Xe]4f145d106s1
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Use the Rydberg equation to calculate the frequency of a photon absorbed when the hydrogen atom
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undergoes a transition from n1 = 2 to n2 = 4. (R = 1.096776 × 107 m-1; c = 3.00 × 108 m/s) - Correct
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Answer - 6.17 × 1014 s-1
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A 6.0-gram champagne cork is shot out of an opened champagne bottle and traveled at a speed of 65
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km/hour. Calculate the de Broglie wavelength (in meters) of the cork. - Correct Answer - 6.1 × 10-33 m
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A(n) _________ is a point at which a standing wave has zero amplitude. - Correct Answer - node
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Calculate the wavelength associated with a 20Ne+ ion moving at a velocity of 2.0 × 105 m/s. The atomic
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mass of Ne-20 is 19.992 amu. (1 amu = 1.66 × 10-24 g and h = 6.63 × 10-34 J • s) - Correct Answer - 1.0 ×
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10-13 m
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The Pauli exclusion principle states that no ____ electrons within an atom can have the same ____
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quantum numbers. - Correct Answer - 2; 4
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Emission spectra - Correct Answer - can be used to identify unknown atoms.
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Which one of the following equations correctly represents the process relating to the ionization energy
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of X? - Correct Answer - X(g) → X+(g) + e-
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How does atomic radius change as you move across the periodic table? - Correct Answer - Atomic radius
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decreases moving from left to right across a period and increases from top to bottom.
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Which of these choices is the electron configuration of the iron(III) ion? - Correct Answer - a. [Ar]3d5
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An element with the general electron configuration for its outermost electrons of ns2np1 would be in
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which element group? - Correct Answer - b. 3A
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The effective nuclear charge for an atom is less than the actual nuclear charge due to - Correct Answer -
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shielding.
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Which pair of ions exhibits the greatest attractive force between them? - Correct Answer - Mg2+ and O2-
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Which of the following is a basic oxide? - Correct Answer - MgO
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Which of these compounds is most likely to be covalent? - Correct Answer - CS2
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In the Lewis structure of the iodate ion, IO3-, that satisfies the octet rule, the formal charge on the
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tcentral iodine atom is - Correct Answer - 2.
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Which molecule has the largest dipole moment? - Correct Answer - HF
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,In which of the following species does the central atom violate the octet rule? - Correct Answer - b. SF4
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Which of these ionic solids would have the largest lattice energy? - Correct Answer - CaCl2
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The total number of bonding electrons in a molecule of formaldehyde (H2CO) is - Correct Answer - 8.
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Which of the following molecules has a nonzero dipole moment? - Correct Answer - SF2
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According to the VSEPR model, a molecule with the general formula AB5 with one lone pair on the
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central atom will have a ______ molecular geometry - Correct Answer - square pyramidal
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Which is the most reasonable prediction for the three F-Br-F bond angles in BrF3? - Correct Answer - c.
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86°, 86°, and 172°
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When PCl5 solidifies it forms PCl4+cations and PCl6- anions. According to valence bond theory, what
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hybrid orbitals are used by phosphorus in the PCl4+cation? - Correct Answer - c. sp3
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According to the VSEPR model, which one of the following molecules and ions will definitely have at least
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one 90° bond angle in it? (In each case, except water, the central atom is the first one in the formula.) -
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Correct Answer - c. PCl5
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What is the number of lone electron pairs on the central atom of a molecule having a trigonal pyramidal
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molecular geometry, such as NH3? - Correct Answer - a. 1
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For which one of the following molecules is the indicated type of hybridization not appropriate for the
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central atom? - Correct Answer - a. BeCl2; sp2
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According to the VSEPR model, the predicted molecular geometry of ammonia, NH3, is - Correct Answer
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- e. trigonal pyramidal.
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What is the mass of one copper atom? (NA = 6.022 × 1023 mol-1) - Correct Answer - a. 1.055 × 10-22 g
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What is the percent sulfur in iron(III) sulfate? - Correct Answer - c. 24%
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Proteins found in humans are polymers that consist of different combinations of 20 amino acids. Proline,
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one of the 20 amino acids, has the molecular formula, C5H9NO2. If a human protein has 25 proline
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monomers, how many carbon atoms from proline are present in the protein? - Correct Answer - e. 125 C
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atoms
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Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of
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electrical insulators. Calculate the number of moles in 47.51 g of Al2O3. - Correct Answer - d. 0.4660 mol
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If 119.3 g of PCl5 are formed from the reaction of 61.3 g Cl2 with excess PCl3, what is the percent yield?
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PCl3(g) + Cl2(g) → PCl5(g) - Correct Answer - b. 66.3%
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What mass of ammonia is formed when 5.36 g of nitrogen gas reacts with excess hydrogen gas? - Correct
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Answer - e. 6.52 g
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, Once the following equation is balanced with the smallest set of whole number coefficients, what is the
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sum of the coefficients? (Don't forget to include coefficients of one.)
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__ SF4 + __ H2O → __ H2SO3 + __ HF - Correct Answer - d. 9
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What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr2O3 with
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8.00 g of aluminum according to the chemical equation below?
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2Al + Cr2O3 → Al2O3 + 2Cr - Correct Answer - b. 15.4 g
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What is the pH of a 0.050 M triethylamine, (C2H5)3N, solution?
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Kb for triethylamine is 5.3 × 10-4. - Correct Answer - a. 11.69
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Which one of the following is a strong acid? - Correct Answer - e. HClO3
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Which is a Lewis acid? - Correct Answer - b. BCl3
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Which is an amphoteric oxide? - Correct Answer - c. Al2O3
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What is the value of the equilibrium constant for the autoionization of water at 25°C? - Correct Answer -
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b. 1.0 × 10-14
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What is the pH of a 0.056 M HNO3 solution? - Correct Answer - b. 1.25
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What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2-) = 1.5 × 10-10 - Correct Answer -
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d. 8.09
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Which is the strongest acid? - Correct Answer - C. H2SO4
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Solid sodium peroxide (Na2O2) reacts with liquid water yielding aqueous sodium hydroxide and oxygen
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gas. How much heat is released if 327.2 g of oxygen gas is produced from the reaction of sodium
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peroxide and water under standard-state conditions?
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Substance ΔH°f(kJ/mol) t
t Na2O2(s) -510.9 NaOH(aq) -469.6 H2O(l) -285.8 - Correct Answer - e. 2914 kJ
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Based on the following thermochemical equations, what is the heat of vaporization of titanium(IV)
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chloride?
t
Ti(s) + 2 Cl2(g) → TiCl4(l) ΔH = -804.2 kJ/mol
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TiCl4(g) → 2 Cl2(g) + Ti(s) ΔH = 763.2 kJ/mol - Correct Answer - a. +41.0 kJ/mol
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