Questão 1
Questão
The statement, Matter is neither creater nor destoryed is called
Responda
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Law of Conservation of Mass
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Law of Definite Proportions
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Dalton's Atomic Theory
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The Scientific Method
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Law of Multiple Proportions
Questão 2
Questão
All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements. Which law does this refer to?
Responda
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Law of Definite Proportions
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Law of the Conservation of Mass
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Law of Modern Atomic Theory
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Law of Multiple Proportions
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First Law of Thermodynamics
Questão 3
Questão
Which of the following is an example of the law of multiple proportions?
Responda
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A sample of chlorine is found to contain three times as much Cl-35 as Cl-37
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Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O :1 g C and 2.66 g O :1 g C
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Two different samples of table salt are found to have the same ratio of sodium to chloride
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The atomic mass of bromine is found to be 79.9 amu
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Nitrogen dioxide always has a mass ratio of 2.28g O : 1 g N
Questão 4
Questão
Calculate the atomic mass of element "X," if it has 2 naturally occurring isotopes with the following masses and natural abundances.
X-45 44.8776 amu 32.88%
X-47 46.9443 amu 67.12%
Responda
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46.26 amu
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45.91 amu
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46.34 amu
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46.84 amu
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44.99 amu
Questão 5
Questão
122
Given the element X
82
How many electrons does this element have? [blank_start]82[blank_end]
How many protons? [blank_start]82[blank_end]
How many neutrons? [blank_start]40[blank_end]
What is the element? [blank_start]Pb[blank_end]
Questão 6
Questão
How many iron atoms are contained in 354 g of iron?
Responda
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2.62 × 1025 Fe atoms
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2.13 × 1026 Fe atoms
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4.69 × 1024 Fe atoms
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3.82 × 1024 Fe atoms
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9.50 × 1022 Fe atoms
Questão 7
Questão
Determine the density of an object that has a mass of 149.8 g and displaces 12.1 mL of water when placed in a graduated cylinder.
Responda
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8.08 g/mL
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1.38 g/mL
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12.4 g/mL
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18.1 g/mL
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11.4 g/mL
Questão 8
Questão
What answer should be reported, with the correct number of significant figures, for the following calculation? (433.621 - 333.9) × 11.900
Responda
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1.19 × 103
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1.187 × 103
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1.1868 × 103
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1.18680 × 103
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1.186799 × 103
Questão 9
Questão
How many significant figures are in the measurement, 0.00049320 g?
Questão 10
Questão
Calculate the wavelength (in nm) of the blue light emitted by a mercury lamp with a frequency of 6.88 × 1014 Hz.
Responda
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229 nm
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436 nm
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206 nm
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485 nm
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675 nm
Questão 11
Questão
Calculate the energy of the orange light emitted, per photon, by a neon sign with a frequency of 4.89 × 1014 Hz.
Responda
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3.09 × 10-19 J
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6.14 × 10-19 J
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3.24 × 10-19 J
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1.63 × 10-19 J
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5.11 × 10-19 J
Questão 12
Questão
How many orbitals are contained in n=1 ([blank_start]1s[blank_end]), in n=2 ([blank_start]1s+3p[blank_end]), in n=3 ([blank_start]1s+3p+5d[blank_end]), in n=6 ([blank_start]1s+3p+5d+7f[blank_end])
Responda
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1s
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1s+3p
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1s+3p+5d
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1s+3p+5d+7f
Questão 13
Questão
Determine the energy change associated with the transition from n=2 to n=5 in the hydrogen atom.
Responda
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-2.18 × 10-19 J
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+6.54 × 10-19 J
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+4.58 × 10-19 J
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-1.53 × 10-19 J
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+3.76 × 10-19 J
Questão 14
Questão
Predict the charge of the ion formed from:
Al [blank_start]3+[blank_end] Na [blank_start]1+[blank_end] Br [blank_start]1-[blank_end] Mg [blank_start]2+[blank_end]
N [blank_start]3-[blank_end] O [blank_start]2-[blank_end] Ne [blank_start]won’t form ion[blank_end]
Responda
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3+
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1+
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1-
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2+
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3-
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2-
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won’t form ion
Questão 15
Questão
Predict the charge of the ion formed from:
Al 3+ Na 1+ Br 1- Mg 2+
N 3- O 2- Ne won’t form ion
Which of the above are metals? [blank_start]Al, Na, Mg[blank_end]
Questão 16
Questão
Write the electron configurations for:
Se [blank_start]1s22s22p63s23p64s23d104p4[blank_end]
Mn2+ [blank_start]1s22s22p63s23p64s03d5[blank_end]
Fe2+ [blank_start]1s22s22p63s23p64s03d6[blank_end]
S [blank_start]1s22s22p63s23p4[blank_end]
Questão 17
Questão
Give the number of core electrons and valence electrons for Se [blank_start]28/6[blank_end] and Sulfur [blank_start]10/6.[blank_end]
Questão 18
Questão
Write an orbital diagram for oxygen
Questão 19
Questão
No two electrons can have the same four quantum numbers is known as the
Questão 20
Questão
Only two electrons, with opposing spins, are allowed in each orbital is known as the
Questão 21
Questão
When filling degenerate orbitals, electrons fill them singly first, with parallel spins is known as
Questão 22
Questão
Place the following elements in order of increasing atomic radius P Ba Cl
Responda
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Ba < P < Cl
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P < Cl < Ba
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Cl < P < Ba
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Cl < Ba < P
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Ba < Cl < P
Questão 23
Questão
Place the following in order of increasing radius
Br⁻ Na⁺ Rb⁺
Responda
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Br⁻ < Rb⁺ < Na⁺
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Na⁺ < Rb⁺ < Br⁻
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Rb⁺ < Br⁻ < Na⁺
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Br⁻ < Na⁺ < Rb⁺
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Rb⁺ < Na⁺ < Br⁻
Questão 24
Questão
Write an reaction equation for the second electron affinity of oxygen
Questão 25
Questão
Write a reaction equation for the second ionization of magnesium
Questão 26
Questão
Place the following in order of increasing IE1.
N F As
Responda
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N < As < F
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As < N < F
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F < N < As
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As < F < N
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F < As < N
Questão 27
Questão
Place the following in order of decreasing metallic character.
Responda
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P > As > K
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As > P > K
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K > P > As
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As > K > P
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K > As > P