化学
化学反応、化学量論、分子構造、元素の性質。
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a 4 ml tube of blood contains 7.2 mg of cholesterol, what is the mg% of…
180 (corresponding to the option "180")
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part 2 of 2 which violate hunds rule? check all that apply. none of the…
The configurations that violate Hund's rule are: - The second row (with \( \uparrow\quad\uparrow\quad\uparrow\downarrow \)) - The third row (with \( \uparrow\quad\uparrow\quad\dow…
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the electron configurations described in this chapter all refer to gase…
[Ar] $4s^{1}3d^{10}4p^{4}$ (the option with this electron configuration)
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what is the maximum number of electrons that can have n=4, m_l=3 in an …
2
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in the series shown below, which of the following has the most unpaired…
$Ar^{3+}$ has the most unpaired electrons (3), compared to $Ar$ (0), $Ar^+$ (1), $Ar^{2+}$ (2). So the answer is $Ar^{3+}$.
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if the caffeine concentration in a particular brand of soda is 3.39 mg/…
First, convert the lethal dose from grams to milligrams: \( 10.0\ g = 10.0\times1000\ mg = 10000\ mg \). Then, find the amount of caffeine in one can: \( 3.39\ mg/oz\times12\ oz =…
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give the electron configuration for the element given. use the noble ga…
\( [Xe] 4f^{14} 5d^{4} 6s^{2} \)
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write the ground-state electron configuration for each element. part 1 …
s: Part 1 (S): \(1s^2 2s^2 2p^6 3s^2 3p^4\) Part 2 (Ca): \(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2\)
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given the equation $\\ln a = \\ln a_0 - kt$, rearrange the equation to …
\( k = \frac{\ln A_0 - \ln A}{t} \) (corresponding to the option \( k = (\ln A_0 - \ln A)/t \))
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which orbital is lower in energy in a many-electron atom? ○ 4s ○ 3s
3s (the orbital with the option "3s")
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particular care must be taken when using radiation for medical imaging.…
A. ionizations
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indicate the total number of 3d electrons in s (z=16).
0
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complete the table below by using the information from the periodic tab…
To complete the table, we use the following rules from the Periodic Table: - **Symbol**: The chemical symbol of the element. - **Atomic Number**: Equal to the number of protons (a…
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calculate the total number of electrons that can occupy the following o…
2 ### Part 2: Seven \( f \) orbitals
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11. what does the period tell you?
In the periodic table, the period (horizontal row) of an element indicates the number of electron shells (energy levels) that the atoms of that element possess.
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give all the possible values of the four quantum numbers of an electron…
\( n \): \( 3 \) \( l \): \( 2 \) \( m_l \): \( -2, -1, 0, 1, 2 \) \( m_s \): \( \frac{1}{2} \) or \( -\frac{1}{2} \)
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select the quantum numbers associated with the 5d orbital. principal qu…
- Principal quantum number (\(n\)): \(5\) - Angular momentum quantum number (\(l\)): \(2\) - Possible magnetic quantum numbers (\(m_l\)): \(-2, -1, 0, +1, +2\)
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8. when you add the electrons in each energy level, the sum represents …
1. electrons 2. protons 3. atomic number ### Question 9
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an electron in an atom is in the n=2 and l=1 quantum level. part 1 of 2…
\( 0, 1 \) ### Part 2 of 2
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4. aluminum has how many electrons?
13
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fast focus standard 3a / page 5 1 a chemist poured formaldehyde into th…
A ### Page 5 Question 2
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consider the bohr model of an atom. part 1 of 2 complete the following …
emitted ### Part 2 of 2 For the transition from \(n = 7\) to \(n=2\):
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7. how many electrons does aluminum have in the first energy level?
2
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determine the reaction mass efficiency for the reaction below, given th…
0.0509
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determine the reaction mass efficiency for the reaction below, given th…
The reaction mass efficiency is approximately \( 4.57\% \)
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4. what happens in a chemical reaction? a) new elements are created. b)…
b) The atoms of reactants rearrange to form new products. ### Question 5
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a type of radiation has an energy of 4.70 × 10⁻²² kj. note: reference t…
\(423\space nm\)
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directions: read each question carefully and answer by choosing the cor…
a) Proton, Electron, Neutron ### Question 2
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how many sig figs are in this number 1 g = 1000 mg 1 3 4 infinite
infinite
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how many sig figs are there in each number 2.5010 2.501 0.025 0.002 0.0…
s: - 2.5010: $\boldsymbol{5}$ - 2.501: $\boldsymbol{4}$ - 0.025: $\boldsymbol{2}$ - 0.002: $\boldsymbol{1}$ - 0.0250: $\boldsymbol{3}$
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density of a liquid was found to be 1.05 g / cm^3, what will be the den…
8.7318 lb/G
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22. the elements c, be, na, mg, ne, o listed in order of increasing fir…
E. Na, Mg, Be, C, O, Ne
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question 3 of 5 why does working out make us feel good? a. it releases …
D. All of the above.
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▲1-70 assign each of the following descriptions of matter to one of the…
s: a. mixture b. compound c. compound d. mixture
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▲1-68 in the following diagrams, different colored spheres represent at…
III, IV b. # Brief Explanations: A mixture has two or more substances. Diagrams I (two elements) and II (two elements + compound, but considered as two substances) are mixtures.
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21. which of the following atoms has the largest radius? a. na b. c c. …
C. Ba
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a(n) of carbon dioxide contains one carbon atom and two oxygen atoms.
molecule
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1-66 indicate whether each of the following statements is true or false…
False. Rewrite: A molecule of an element is always homoatomic (contains only one type of atom), while heteroatomic molecules are characteristic of compounds (containing different …
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1-64 assign each of the following molecular descriptions for a pure sub…
(2) must be a compound ### Part b
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20. in general, as you go across a period from left to right in the per…
D. decreases, increases, increases
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15. which of the following combinations of quantum numbers is permissib…
C. \( n = 3, l = 2, m_l = 1, m_s = +\frac{1}{2} \)
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18. what is the electron configuration for an iodine atom? a. kr5s²4d¹⁰…
A. \([Kr]5s^24d^{10}5p^5\)
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portions of orbital diagrams representing the ground-state electron con…
The orbital diagram with $\boxed{11\ 1\downarrow\ 1\ 1\ 1}$ (the third one) violates the Pauli exclusion principle.
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1-58 classify the substances represented by the following models as hom…
a. Heteroatomic b. Homoatomic c. Heteroatomic d. Heteroatomic
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the electron configurations described in this chapter all refer to gase…
$1s^{2}2s^{2}2p^{2}3d^{1}$ (the second option: $1s^{2}2s^{2}2p^{2}3d^{1}$)
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what is the maximum number of electrons that can have n=4, m_l=-1 in an…
6
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1-56 in which of the following sequences of elements do all the element…
a. Silver, gold, mercury
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in the series shown below, which of the following has the most unpaired…
P (with 3 unpaired electrons)
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give the electron configuration for the element given. use the noble ga…
\( [\text{Ar}] 4s^2 3d^{10} 4p^2 \)
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7. how are the terms group period used on the periodic table?
- **Group**: Vertical columns in the periodic table. Elements in the same group have the same number of valence electrons, resulting in similar chemical properties. - **Period**: …
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1-56 in which of the following sequences of elements do all the element…
d. Potassium, iron, lead
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write the ground-state electron configuration for each element. part 1 …
s - Au: $\boldsymbol{[Xe]4f^{14}5d^{10}6s^{1}}$ - As: $\boldsymbol{[Ar]4s^{2}3d^{10}4p^{3}}$
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8. what is the general location of metals on the periodic table?
Metals are generally located to the left of the zig - zag (staircase) line that separates metals, non - metals, and metalloids on the periodic table. In general terms, they are fo…
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1-54 write the chemical symbol for each member of the following pairs o…
Copper: Cu; Cobalt: Co ### Part b
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1-52 give the chemical symbol for each of the following elements. a. me…
a. Mercury: Hg b. Chlorine: Cl c. Gold: Au d. Beryllium: Be
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6. what three metals are in the third period (row) of the periodic tabl…
Sodium (Na), Magnesium (Mg), and Aluminum (Al)
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5. the elements fluorine, chlorine and bromine are in which group of th…
c. the halogens
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1. groups of the periodic table corresponds to elements with: a. the sa…
c. Similar chemical properties
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1-50 give the name of the element denoted by each of the following chem…
a. Lithium b. Helium c. Fluorine d. Zinc
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complete this equation that represents the process of nuclear fission. …
A: \(146\) B: \(56\)
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1-48 with the help of figure 1-10, indicate whether the first listed el…
s: a. More abundant (Oxygen vs Hydrogen) b. Less abundant (Iron vs Aluminum) c. Less abundant (Calcium vs Magnesium) d. Less abundant (Copper vs Sodium)
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choose the total number of each item requested below. 4c₆h₁₂o₆ carbon a…
Carbon atoms: 24 Hydrogen atoms: 48 Oxygen atoms: 24 Molecules: 4
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1-46 indicate whether each of the following statements about elemental …
False ### Part b
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which orbital is lower in energy in a many-electron atom? ○ 3s ○ 4s
\(3s\) (i.e., the option with "3s")
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indicate the total number of 4d electrons in ba (z=56).
10
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match the following scientists with their contribution to the atom stru…
- Dalton: Proposed atomic theory (atoms are indivisible, same element atoms are identical, combine in fixed ratios). - Democritus: Coined "atom", proposed matter is made of tiny, …
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which scientist proposed that electrons travel in fixed paths in the at…
A. Niels Bohr
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j. j. thomson observed that a cathode ray is diverted by electrically-c…
A. There are negatively charged particles in the atom.
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who was the first person to come up with the idea of the atom? ○ jj tho…
D. Democritus
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which option is an example of chemical energy being transformed into ki…
B. A rocket engine igniting its fuel during liftoff
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what is the largest component of soil by percentage? organic matter the…
mineral matter
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choose the correct answer. which of these describes physical weathering…
B. rocks being broken down by freezing and thawing (assuming the options are labeled A, B, C with A as "plants, lichens, and mosses breaking down rocks", B as "rocks being broken …
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locating information in difficult graphics approximate colors of jewelr…
10% copper, 40% silver, and 50% gold
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locating information in difficult graphics approximate colors of jewelr…
yellowish (the option corresponding to "yellowish" among the choices)
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locating information in difficult graphics approximate colors of jewelr…
40 percent (the option: 40 percent)
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key terms - chemistry - organic chemistry - inorganic chemistry - analy…
### Completion Exercise Answers: 1. **Composition** (Chemistry studies the composition of matter). 2. **Changes** (and the changes matter undergoes). 3. **Five** (traditionally di…
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which of the following is an example of quantitative data? the color of…
C. The temperature in degrees Celsius
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predicting the products of a decomp if mercury (ii) oxide is heated and…
Hg
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which of the following is not a property of metals? poor conductors mal…
poor conductors
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gold has high conductivity. what does this mean? it allows electrons to…
A. It allows electrons to flow easily.
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most elements are metals. what is a physical property of metals? they a…
B. They conduct heat.
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determine the number of significant figures in 10.0 grams
B. 3 (assuming the purple option is labeled B, if the options are labeled as A:4, B:3, C:5, D:2)
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most substances that are not metals look dull. why? they are not ductil…
B. They lack luster.
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copper is very ductile. what does this mean? it is very shiny. it can b…
B. It can be pulled into a wire easily.
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how many significant figures does the following number have?1.2500 x 10³
5 (corresponding to the option with 5)
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11/22 how many significant figures: 153.0 ml 3 2 4 1
4 (corresponding to the orange option with "4")
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9/22 how many significant figures: 0.010 l 3 1 4 2
2 (The option with "2" is the correct one. If we consider the options as, for example, let's assume the options are labeled as: A. 3 B. 1 C. 4 D. 2 Then the answer is D. 2)
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how many significant figures in the number below? 4.56 × 10³ 6 3 4 5
B. 3 (assuming the purple option with 3 is labeled as B, if we follow the order of options: first green 6, then purple 3, then orange 4, then cyan 5. So the correct option is the …
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how many significant figures: 0.012 km
2 (corresponding to the option with value 2, e.g., if the options are labeled as A. 4, B. 1, C. 3, D. 2, then the answer is D. 2)
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how many significant figures: 100.000 cl
6
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how many sig figs are there? 0.0000008 7 2 1 6
1 (corresponding to the option with value 1, e.g., if the orange option is labeled with 1, then the answer is the orange option with text "1")
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how many sig figs are there? 1000000000
B. 1 (assuming the purple option with "1" is option B, adjust identifier if needed)
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analyze the pie chart, which shows the abundance of elements in earth’s…
C. gold, magnesium, iron, aluminum (assuming the third option is labeled C, but in the given options, the third option is "gold, magnesium, iron, aluminum")
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multiple choice 4 points dr. johnson doesn’t want people to sit back, d…
A. problem and solution
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the osmotic pressure exerted by a solution is equal to the molarity mul…
Your equation: $c=\frac{\Pi}{RT}$ Definitions of your symbols: - $\Pi$: osmotic pressure (17. atm) - $T$: absolute temperature (395. K) - $c$: molarity of the solution (For numeri…
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the osmotic pressure exerted by a solution is equal to the molarity mul…
The equation to calculate the molarity $c$ is $c = \frac{\Pi}{RT}$, where $\Pi$ is the osmotic pressure (17 atm), $T$ is the absolute temperature (395 K), and $R$ is the gas const…
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masteryconnect wilson, makyla dtal- ch- term 1 - unit 1 assessment - 25…
C. heat
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masteryconnect dtal-ch- term 1 - unit 1 assessment - 25-26 a pure subst…
C. compound
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masteryconnect data ch-term 1 - unit 1 assessment - 25-26. the law of c…
The first model (with 1 dark sphere + 2 light spheres as reactants, forming 1 dark - 2 light sphere product)
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why does water bead up on a freshly waxed car? adhesion cohesion heat c…
cohesion