化学
化学反応、化学量論、分子構造、元素の性質。
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pregunta 1 de 25 cuando un gas se disuelve en un líquido, ¿qué sucede c…
# Breve Explicación: Según la ley de Henry, la solubilidad de un gas en un líquido es directamente proporcional a la presión de ese gas sobre la superficie del líquido. Cuando aum…
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pregunta 1 de 28 ¿cuál de los siguientes afecta la constante de velocid…
B. La temperatura del sistema
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pregunta 1 de 25 ¿cómo cambiaría el equilibrio si se añadiera no2 a la …
# Explicación: ## Paso 1: Aplicar el principio de Le - Chatelier Según el principio de Le - Chatelier, cuando se agrega un reactivo (en este caso NO2) a un sistema en equilibrio, …
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¿cuál de las siguientes reacciones resultaría en una disminución de la …
# Explicación breve: La entropía es una medida de la desorden en un sistema. La entropía disminuye cuando hay una transición de un estado más desordenado a uno más ordenado. En el…
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¿qué perfil energético muestra mejor que el δla h_f del h_2 s es -20,6 …
B. Perfil energético A
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here is a graph of the pressure of ozone (o₃) in a reaction vessel duri…
Is $O_3$ being created or destroyed by the chemical reaction? Destroyed If $O_3$ is being created or destroyed, what is the rate at which it is being created or destroyed 1100 sec…
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in the periodic table below, shade the p - block elements.
Shade the elements: B, C, N, O, F, Ne, Al, Si, P, S, Cl, Ar, Ga, Ge, As, Se, Br, Kr, In, Sn, Sb, Te, I, Xe, Tl, Pb, Bi, Po, At, Rn.
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how many valence electrons are in a neutral atom of hydrogen?
1
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pregunta 1 de 25 ¿cuál es el nombre de la molécula que se muestra a con…
# Explicación: ## Paso 1: Contar átomos de carbono La molécula tiene 8 átomos de carbono. ## Paso 2: Identificar tipo de enlace Tiene un enlace doble en la posición 1. ## Paso 3: …
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¿cuál muestra un triglicérido?
B.
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pregunta 1 de 25 ¿cómo se llama la molécula de abajo? a. pentano b. 2 -…
C. 2 - penteno
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¿cuál describe la molécula que se muestra a continuación? a. alquino in…
A. alquino insaturado
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pregunta 1 de 25 ¿qué imagen muestra 2 - hexino? a. b. do. d.
# Explicación breve: El 2 - hexino es un hidrocarburo alquino con seis átomos de carbono y una triple unión en la posición 2. La estructura correcta debe tener una cadena de seis …
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pregunta 1 de 25 ¿qué grupo funcional se muestra a continuación? r-\\(\…
# Breve Explicación: El grupo funcional mostrado tiene la estructura genérica de un éster, que se representa por la unión de un ácido carboxílico y un alcohol, donde el átomo de o…
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pregunta 1 de 25 ¿qué tipo de molécula se muestra a continuación? a. ce…
B. Ester
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¿qué molécula tiene 6 átomos de carbono? a. octyne b. hexeno dq. penten…
B. Hexeno
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pregunta 1 de 25 el metano (ch₄) es el principal componente del gas nat…
# Explicación: ## Paso 1: Escribir la reacción de combustión balanceada del metano La reacción de combustión balanceada del metano es $CH_4 + 2O_2 ightarrow CO_2+2H_2O + calor$. #…
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pregunta 1 de 25 ¿cuál es el nombre del alcano ramificado que se muestr…
B. 2 - metilheptano
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here is a graph of the pressure of oxygen (o₂) in a reaction vessel dur…
Is $O_2$ being created or destroyed by the chemical reaction? Destroyed If $O_2$ is being created or destroyed, what is the rate at which it is being created or destroyed 90 secon…
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pregunta 1 de 20 ¿qué tipo de molécula se muestra a continuación? h h |…
A. Alquino B. Alqueno DO. alcano cíclico D. alqueno cíclico No hay opción correcta en las presentadas, pero la estructura es un alcano.
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¿qué molécula es el propano? o a. o b. o dq. o d.
D. H - C - C - C - H | | | H H H
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pregunta 1 de 25 ¿qué grupo funcional contiene la siguiente molécula? h…
B. Hidroxilo
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¿qué tipo de molécula es la acetona? a. cetona b. alcohol do. amina d. …
# Breve Explicación: La acetona es un compuesto orgánico que pertenece a la clase de los cetonas. Las cetonas son compuestos orgánicos que tienen un grupo carbonilo (C=O) unido a …
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¿qué indica el prefijo metil-? a. la molécula está saturada de átomos d…
DO. La molécula es un hidrocarburo ramificado.
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1. what are synthetic materials made from? a. only from other synthetic…
# Breve explicación: 1. Los materiales sintéticos se fabrican a partir de recursos naturales que han sido químicamente transformados. 2. El nailón es un material sintético, mientr…
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the chemical formula for barium hydroxide is: ba(oh)₂. how many oxygen …
2
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fill in the missing information about the atoms in the table below. | s…
| symbol | number of protons | number of electrons total | number of electrons valence | number of electron shells | | ---- | ---- | ---- | ---- | ---- | | Ra | 88 | 88 | 2 | 7 | …
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a chemist must prepare 0.250 l of 1.00 m aqueous nickel(ii) chloride ($…
$0.137$
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a chemist makes 0.960 l of magnesium fluoride (mgf₂) working solution b…
$0.000125$
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calculate the volume in liters of a 0.23m potassium permanganate soluti…
2.8 L
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a chemist adds 1.05 l of a 0.878 mol/l sodium carbonate (na₂co₃) soluti…
$97.7$
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a chemist adds 200.0 ml of a 0.050 mmol/l sodium nitrate (nano₃) soluti…
$0.85\ mg$
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a chemist adds 0.15 l of a 2.33 mol/l nickel(ii) chloride (nicl2) solut…
45 g
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a chemist prepares a solution of copper(ii) fluoride (cuf2) by measurin…
$8.99\times 10^{-5}\ mol/L$
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a chemist prepares a solution of potassium iodide (ki) by measuring out…
$7.20\ mol/L$
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calculate the volume in liters of a 0.078 mol/l silver nitrate solution…
77 L
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calculate the volume in liters of a 0.010 mol/l zinc nitrate solution t…
$400$
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a chemist adds 1.20 l of a 0.0551m potassium iodide (ki) solution to a …
$0.0661\ mol$
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a chemist prepares a solution of mercury(i) chloride ($hg_2cl_2$) by me…
$3.28\times 10^{-6}\ \frac{\text{mmol}}{\text{L}}$
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compound $x$ has a molar mass of $416.41 g mol^{-1}$ and the following …
$P_{2}Cl_{10}$
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measurements show that unknown compound x has the following composition…
$C_{5}H_{4}O_{2}$
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to rent a certain meeting room, a college charges a reservation fee of …
$t\leqslant11$
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what is the minimum mass of chalcopyrite (cufes₂), a copper ore, from w…
$2.9\ kg$
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this is the chemical formula for calcium phosphate: $ca_{3}(po_{4})_{2}…
20%
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review the details below. - the queen bee lays eggs and produces a chem…
Queen bees, worker bees, and drones all have specific functions in their hives.
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calculate the number of phosphorus atoms in a 60.0 g sample of diphosph…
$5.09\times 10^{23}\ atoms$
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calculate the mass of diphosphorus pentoxide (p₂o₅) that contains a mil…
$4.71\times 10^{-17}\text{ g}$
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name the following compound nacl
Sodium chloride
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13 how many electrons can the d orbital hold at maximum? a. 2 b. 8 c. 1…
13. d. 10 14. c. 7 16. c. It tells you the energy level of that orbital
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11 the pauli exclusion principle states that how many electrons can fit…
11. B. 2 12. D. s orbital
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what is the mass of 75,000 oxygen molecules? express your answer in sci…
$3.975\times10^{-18}$ g
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name the following compound h₂o₂
Hydrogen peroxide
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the chemical formula for propane is: ch₃ch₂ch₃. calculate the molar mas…
44.11 g/mol
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e. what is wrong with the following electron configurations: 9. kr: 1s²…
9. Incorrect orbital notations and filling order. 10. 4s orbital should be filled before 3d according to Aufbau principle.
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e. what is wrong with the following electron configurations: kr: 1s²2s²…
In the first configuration, 4p⁸ has more electrons than the p - subshell capacity. In the second configuration, the electron - filling order is incorrect as it skips the 5p and 4d…
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name the following compound c4f8
tetracarbon octafluoride
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d. in the space below, write the noble gas (abbreviated) electron confi…
Ag: $[Kr]4d^{10}5s^{1}$ Bi: $[Xe]4f^{14}5d^{10}6s^{2}6p^{3}$
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rank these nonpolar molecules in order of increasing boiling point. (re…
He < $CH_4$ < Ar
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given the chemical name, identify the chemical formula dihydrogen monox…
$H_2O$
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c. for the following electron configurations determine the possible ele…
5. Arsenic (As) 6. Lead (Pb)
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an unknown compound has the following chemical formula: pcl_x where x s…
$PCl_{5}$
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given the chemical name, identify the chemical formula tetrabromine pen…
$P_{5}Br_{4}$
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b. write the full ground state electron configuration for these ions. 3…
$Ca^{2+}$: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ $N^{3 -}$: $1s^{2}2s^{2}2p^{6}$
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which of these molecules would exhibit ldfs? both molecules only c4h10 …
Both molecules
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this is the chemical formula for acetic acid (the chemical that gives t…
$7.64$ mol
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given the chemical name, identify the chemical formula hexafuorine hept…
$I_{7}F_{6}$
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the chemical formula for lithium hydride is lih. a chemist measured the…
11.1 mol
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the chemical formula for magnesium sulfide is mgs. a chemist determined…
$0.56\ g$
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a chemist weighed out 5.9 g of tin. calculate the number of moles of ti…
$0.050$ mol
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electron configuration quiz a. write the full ground state electron con…
Ge: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{2}$ Ar: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$
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a chemist determined by measurements that 0.055 moles of aluminum parti…
$1.5\ g$
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which molecule is more polarizable?
The molecule $CBr_4$ (the one with Br atoms) is more polarizable.
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a penny has a mass of 2.50 g and the moon has a mass of 7.35×10^{22} kg…
$48.8$
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a copper atom has a mass of 1.06×10⁻²² g and a penny has a mass of 2.5 …
63.8 g
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sodium (na) in group 1a is ......................reactive than neon (ne…
A. more
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hydrolysis of amides is an important reaction, because it represents th…
The carboxylic acid product formed is $\text{CH}_3\text{CH}_2\text{COOH}$ (propanoic acid) and the amine product (in non - salt form) is $(\text{CH}_3\text{CH}_2)_2\text{NH}$ (die…
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question 2/3 we can use the periodic table to predict which element may…
8
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question 1/3 we can use the periodic table to predict which element may…
1
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decide whether these proposed lewis structures are reasonable. proposed…
1. Yes. 2. Yes. 3. Yes.
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the table below lists information about some diatomic molecules or mole…
| molecule | stable? | diamagnetic or paramagnetic? | bond order | | ---- | ---- | ---- | ---- | | $B_2$ | yes | paramagnetic | 1 | | $Be_2$ | no | N/A (unstable) | 0 | | $Ne_2$ |…
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the table below lists information about some diatomic molecules or mole…
| molecule | stable? | diamagnetic or paramagnetic? | bond order | | ---- | ---- | ---- | ---- | | $O_2^+$ | yes | paramagnetic | 2.5 | | $O_2^{2 - }$ | yes | diamagnetic | 1 | | …
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the table below lists information about some diatomic molecules or mole…
| molecule | stable? | diamagnetic or paramagnetic? | bond order | | ---- | ---- | ---- | ---- | | $O_2$ | yes | paramagnetic | 2 | | $He_2$ | no | diamagnetic | 0 | | $F_2$ | yes…
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the table below lists information about some diatomic molecules or mole…
| molecule | stable? | diamagnetic or paramagnetic? | bond order | | ---- | ---- | ---- | ---- | | \(C_2\) | yes | diamagnetic | 2 | | \(F_2^-\) | yes | paramagnetic | 0.5 | | \(H…
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what are the angles a and b in the actual molecule of which this is a l…
$a = 120$ $b = 109.5$
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consider reaction no. 4. what are the values for the balanced equation …
243
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answer the questions below about the highlighted atom in this lewis str…
In how many sigma bonds does the highlighted atom participate? 4 In how many pi bonds does the highlighted atom participate? 0 What is the orbital hybridization of the highlighted…
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answer the questions below about the highlighted atom in this lewis str…
In how many sigma bonds does the highlighted atom participate? 3 In how many pi bonds does the highlighted atom participate? 1 What is the orbital hybridization of the highlighted…
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complete this table. | name | empirical formula | |--|--| | lead(ii) br…
| name | empirical formula | |--|--| | lead(II) bromide | $PbBr_{2}$ | | barium chloride | $BaCl_{2}$ |
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question 3 0 / 1 pts how do you select the ions to write in the net ion…
D. Locate the solid (s) product
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complete this table. | name | empirical formula | |--|--| | chromium(ii…
| name | empirical formula | |--|--| | chromium(II) iodide | $CrI_{2}$ | | barium sulfide | $BaS$ |
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a wireless phone company has a pricing scheme that includes 250 minutes…
a. $\overline{C}(x)=\frac{35}{x},0 < x\leq250$ b. $\overline{C}(x)=0.4-\frac{65}{x},250 < x\leq300$ c. $18$ cents
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for each row in the table below, decide whether the pair of elements wi…
| element #1 | element #2 | compound formed? | chemical formula | | ---- | ---- | ---- | ---- | | hydrogen | chlorine | molecular | HCl | | nitrogen | hydrogen | molecular | NH₃ |…
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select the correct answer. how many atoms are in 131.97 liters of water…
D. $1.0645\times10^{25}$
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what is step 3? find the number of molecules by multiplying the number …
Find the number of molecules by multiplying the number of moles of sucrose by Avogadro's number.
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john is working in the chemistry lab. he has 12 g of sucrose (c₁₂h₂₂o₁₁…
The steps to find the number of molecules of sucrose are: 1. Find the molar mass of sucrose. 2. Calculate the number of moles of sucrose using the formula $n=\frac{m}{M}$. 3. Find…
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calculate the number of atoms in 2 mol of sulfur dioxide (so₂). 1.205×1…
C. $3.614\times 10^{24}$
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | | ---- | ---- | ---- | ---- | | $Co^{2+}$ | $I^-$ | $CoI_2$ | cobalt(II) iodide | | $Co^{3+}$ | $I^-$ | $CoI_3$ | cobalt(…
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calculate the number of molecules in 3 mol of carbon dioxide (co₂). 1.8…
1. $1.807\times 10^{24}$
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calculate the volume of 7 mol of hydrogen at stp. 0.3 liters 20 liters …
C. 156.8 liters
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decide whether each molecule or polyatomic ion is polar or nonpolar. if…
| molecule or polyatomic ion | polar or nonpolar? | atom closest to negative side | | ---- | ---- | ---- | | H₂O | polar | O | | SiF₄ | nonpolar | | | HI | polar | I |