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