化學
化學反應、化學計量、分子結構與元素性質。
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read the excerpt from \how we entered world war i.\ in the midst of it …
demonstrate that Germany was a legitimate threat to the United States.
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post - race activity classify the following terms as they apply to the …
Very Important: Friction on wheels, Weight, Speed, Newton's First Law of Motion, Air friction, Size of balloon, Aerodynamics, Mass of car, Acceleration, Distance of race, Safety, …
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ed science 7300a distinguishing between endothermic and exothermic in a…
In an exothermic reaction, energy is released to the surroundings. In an endothermic reaction, energy is absorbed from the surroundings.
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what are some indicators that a chemical reaction is occurring? check a…
- the formation of bubbles - a change in color - the formation of a precipitate
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the difference between a molecule and a compound is that a compound is …
1. different elements 2. substance
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magnesium acts similar to sodium when forming an ionic bond in terms of…
A. by losing two electrons
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which atom is most likely to form a metallic bond? o aluminum (al) o he…
aluminum (Al)
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the electron dot diagram shows the arrangement of dots without identify…
tellurium (Te)
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which pairs of elements do not have to satisfy the octet rule for stabi…
helium (He) and hydrogen (H)
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metal atoms tend to give away valence electrons when they bond with non…
B. An ionic bond will form because electrons are transferred.
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which is a force that holds atoms together? chemical bond electron shel…
A. chemical bond
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consider the equilibrium system described by the chemical reaction belo…
$K_c = 8.0\times10^{9}$, $K_p=1.24\times10^{3}$
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fluorine (f) and bromine (br) are in the same group on the periodic tab…
C. Both a fluorine atom and a bromine atom gain one electron, and both atoms become stable.
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when sodium atoms (na) and chlorine atoms (cl) join to make sodium chlo…
potassium (K) and fluorine (F)
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consider the equilibrium system described by the chemical reaction belo…
$8.0\times10^{9}$
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lead is malleable, so it can be pounded into flat sheets without breaki…
C. Metallic bonds involve many valence electrons shared by many atoms, so the bonds can move around as the metal is pounded.
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which of the following effects did you include in your description? the…
The use of blank verse makes the poem sound like everyday speech. Blank verse's regular meter gives the poem a sense of structure and stability. If the poem had a rhyme scheme, it…
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construct the expression for kc for the following reaction. h₂o(l) ⇌ h⁺…
$K_c=[H^+][OH^-]$
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how does frost use irregular blank verse to affect the language of his …
Frost makes the language sound like everyday speech through irregular blank verse.
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complete the passage to describe how electrons are represented in elect…
The maximum number of dots an electron - dot diagram can have is 8. The maximum number of dots on one side of a chemical symbol in an electron - dot diagram is 2.
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which model correctly represents the electron dot diagram of antimony? …
The last option with the symbol Sb and dots representing 5 valence electrons (assuming it has 5 dots around Sb).
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does the model correctly represent the electron dot diagram of magnesiu…
No, because magnesium has two valence electrons. No, because both of the dots should be around the chemical symbol (not just one as shown).
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order the steps to take when drawing electron dot diagrams. count the d…
1. Use the periodic table to find the chemical symbol of the atom and the number of electrons in the valence shell. 2. Write the chemical symbol of the atom. 3. Draw dots around t…
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what information is shown in an atoms electron dot diagram? o the numbe…
the number of valence electrons an atom has
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what characteristics suggest that the second example is written in blan…
B. no rhyme, ten syllables to a line, and pairs of syllables in which the second syllable is stressed
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calcium chloride is used to make pickles. the calcium atom transfers el…
1. Ionic 2. Metallic 3. Covalent
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does this atom satisfy the octet rule? why or why not?
No, because sodium has 1 electron in its outermost shell instead of 8 as required by the octet rule.
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complete the sentence. atoms form chemical bonds to satisfy the rule an…
octet; more stable
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speaker. (1) out of the night that covers me, black as the pit from pol…
The rhyme scheme and meter in "Invictus" contribute to a tone of resilience and determination by creating a steady rhythm and a musical quality that emphasizes the speaker's unwav…
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question 7 (1 point) retake question find the percent composition of ti…
B. 46.2% Sn, 53.8% As
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question 7 find the percent composition of tin (iv) arsenide 36.2% sn, …
B. 46.2% Sn, 53.8% As
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question 4 (1 point) saved how many molecules of trinitrogen dichlorine…
C. $2.16\times 10^{25}$ ### Question 5
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question 1 (1 point) saved calculate the number of atoms in 0.2505 mol …
$1.51\times 10^{23}$ atoms ### Question 2
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quiz 6 question 1 calculate the number of atoms in 0.2505 mol of rhodiu…
$1.509\times 10^{23}\text{ atoms}$ (rounded to three - significant figures) ### Question 2
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8th science - 6(a) - s1 interactivity: analyze exothermic and endotherm…
5. After; Before 6. Release 7. Exothermic
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8th science - 6(a) - s1 interactivity: analyze exothermic and endotherm…
This graph represents an exothermic reaction.
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relationships involving $delta h_{rxn}$, hess’s law (sample) example 1:…
$131.3\ kJ$
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choose the correct rhyme scheme for each of the following lines. had th…
Had they been swallows only: a Without the passion stronger: b That skyward longs and sings,—: c Woe’s me, I shall be lonely: a When I can feel no longer: b The impatience of thei…
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3. a 30.00 ml sample of 0.100 m hocl ($k_a = 3.3\times10^{-8}$) is titr…
a. $HOCl(aq)+OH^-(aq) ightarrow OCl^-(aq)+H_2O(l)$ b. 10.09 c. No, because the pH at the equivalence point (10.09) is outside the pH - range (8.0 - 9.6) of thymol blue.
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2. a student uses 0.1376 g of an unknown acid in the first titration an…
0.1376 g
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stars hotter than the sun (over 6,000 degrees c) put out most of their …
1. B. False 2. A. True 3. B. Temperature, C. Chemical Makeup
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electromagnetic waves with shorter wavelengths have higher frequencies …
1. True 2. False 3. Wavelength
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practicing identifying valence electrons in elements use the periodic t…
# Explanation: ## Paso 1: Identificar el grupo de sodio (Na) El sodio está en el grupo 1 de la tabla periódica. Los elementos del grupo 1 tienen 1 electrón de valencia. ## Paso 2:…
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determining electron configurations using the periodic table use the pe…
# Explanation: ## Paso1: Identificar el número atómico de Pm Prometio (Pm) tiene un número atómico de 61. El gas noble anterior es el xenón (Xe), que tiene un número atómico de 54…
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determining electron configurations using the periodic table use the pe…
# Explicación: ## Paso 1: Encontrar el número atómico de Ca El calcio (Ca) tiene un número atómico de 20. ## Paso 2: Identificar el gas noble anterior El gas noble anterior al cal…
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etermining electron configurations using the periodic table use the per…
# Explicación: ## Paso 1: Identificar el número atómico de Y Yttrio (Y) tiene un número atómico de 39. ## Paso 2: Elegir el gas noble anterior El gas noble anterior a Yttrio es Kr…
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determining electron configurations using the periodic table use the pe…
[Ne] $3s^{2}3p^{2}$
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use the periodic table to identify the element represented by each of t…
# Explanation: ## Paso 1: Contar electrons totales El notación de gas noble representa los electrones de los elementos anteriores. Para [He]2s², He tiene 2 electrones y 2s² agrega…
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use the periodic table to identify the noble gas that would be included…
# Explicación breve: Para la notación de gas noble, se busca el gas noble más cercano con un número atómico menor que el elemento dado. El silicio (Si) tiene un número atómico de …
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determine trends in elements. which group of elements would generally h…
# Breve explicación: La radiación atómica aumenta hacia abajo en un grupo y disminuye hacia la derecha en un período en la tabla periódica. Los elementos del Grupo 1A son los más …
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which element has the highest electronegativity? beryllium fluorine nit…
B. fluorine
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practice describing the atomic properties. the missing components in th…
# Explicación: ## Paso 1: Buscar afinidad electrónica del cloro La afinidad electrónica del cloro es de 349.0 kJ/mol. ## Paso 2: Buscar electronegatividad del cloro La electronega…
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how is energy associated with food stored? a. potential energy in chemi…
A. potential energy in chemical form
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determining periodic trends for each of the following statements, deter…
- El tamaño de los radios atómicos: disminuye - La electronegatividad: aumenta - La primera energía de ionización: disminuye
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oring the electronegativities of elements use the periodic table to exp…
# Explicación: ## Paso1: Buscar en la tabla periódica La electronegatividad es una propiedad de los átomos. La cloro (Cl) tiene una electronegatividad de 3.16. ## Paso2: Continuar…
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use the periodic table to explore the electron affinity of elements fro…
Phosphorus' electron affinity value is more negative than the electron affinity value of sodium.
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exploring the electron affinities of elements. use the periodic table t…
Chlorine’s electron affinity value is more negative than the electron affinity value of bromine.
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use the periodic table to explore the ionization energies of elements f…
# Explicación: ## Paso 1: Comprender la tendencia de la energía de ionización La energía de ionización aumenta hacia la derecha en un período en la tabla periódica debido a un may…
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exploring the ionization energies of elements use the periodic table to…
# Explicación detallada: ## Paso 1: Comprender la tendencia de la energía de ionización en el período. La energía de ionización aumenta hacia la derecha en un período dado en la t…
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use the periodic table to explore the ionic radii of elements from peri…
1. potasio 2. sodio 3. magnesio
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5 - 26 physical science 1 periodic trends exploring the ionic radii of …
# Explicación: ## Paso 1: Comprender la tendencia de radio iónico en un grupo En un grupo de la tabla periódica, el radio iónico aumenta hacia abajo. Esto se debe a que los iones …
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exploring the atomic radii of elements element atomic radius ( {a}) bro…
A = 1.14 B = 1.35 C = 1.54
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what is the number of valence electrons in cadmium (cd)? 1 2 10 12
# Explicación detallada: ## Paso 1: Escribir la configuración electrónica de Cd La configuración electrónica de cadmio (Cd), con número atómico 48, es $[Kr]4d^{10}5s^{2}$. ## Paso…
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question 9 (2.5 points) the nucleus of an atom contains protons only el…
Question 9: protons and neutrons Question 10: solvent
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question 7 (2.5 points) a(n) ____ is a type of chemical bond in which a…
Question 7: E. ionic bond Question 8: A. 1
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which statement describes the 3d, 4s, and 4p orbitals of arsenic (as) b…
# Explicación detallada: ## Paso 1: Determinar la configuración electrónica de Arsénico El número atómico del arsénico (As) es 33. Su configuración electrónica es $1s^{2}2s^{2}2p^…
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question 47 (2 points) the relatively new field of ____ studies the int…
C. psychoneuroimmunology
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question 5 (2.5 points) tracers are used in what form of medical test? …
Question 5: A. PET scans Question 6: A. ionic
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question 1 (2.5 points) the structural formula for molecular oxygen is …
Question 1: D. double covalent Question 2: E. hydrogen
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which is the electron configuration for nobelium (no)? ne 3s²3p⁷ rn 7s²…
D. [Rn] 7s²5f¹⁴
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which is the electron configuration for nobelium (no)? ne 3s²3p⁷ rn 7s²…
D. [Rn] 7s²5f¹⁴
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in which block of the periodic table is chromium (cr) found? d block s …
# Breve explicación: Los elementos del bloque d son los metales de transición. El cromo (Cr) es un metal de transición y, por lo tanto, se encuentra en el bloque d de la tabla per…
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the noble - gas notation for tin (sn) will contain the symbol ar. xe. k…
C. [Kr]
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which of these elements has the fewest valence electrons? beryllium car…
litio
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how many valence electrons does lithium (li) have available for bonding…
# Explicación detallada: ## Paso 1: Identificar la configuración electrónica de litio El número atómico del litio es 3. Su configuración electrónica es 1s²2s¹. ## Paso 2: Determin…
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which of these elements has an electron configuration of kr 5s²? barium…
strontium
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the electron configuration of nitrogen (n) is 1s²2s²2p³ 1s²2s²2p⁴ 1s²2s…
# Explicación breve: El número atómico del nitrógeno es 7. Los electrones se distribuyen en orbitales atómicos de acuerdo con las reglas de llenado de orbitales (principio de Aufb…
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which element would release the most energy while adding an electron to…
D. Br
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which element has the smallest atomic radius? potassium titanium scandi…
# Explicación breve: La radiación atómica disminuye a lo largo de un período de la tabla periódica debido al aumento en la carga nuclear sin un aumento proporcional en la shieldin…
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the damage caused by hurricane katrina took the form of __________. a. …
D. all of the above
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among the elements of the main group, the first ionization energy incre…
C. from left to right across a period.
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which element would most likely have an electron affinity measuring clo…
Ar
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how does a lithium cation compare to a lithium atom? the cation has the…
El catión es más pequeño.
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which ion was formed by providing the second ionization energy to remov…
$Ca^{2 + }$
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which correctly summarizes the trend in electron affinity? it tends to …
# Breve explicación: La afinidad electrónica es la energía liberada cuando un átomo neutro en el estado gaseoso adquiere un electrón. A lo largo de un período (de izquierda a dere…
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which element has a larger atomic radius than sulfur? oxygen cadmium fl…
# Explicación breve: La radiación atómica aumenta hacia abajo en un grupo y hacia la izquierda en un período en la tabla periódica. El cadmio está en un período más bajo que el az…
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which element has a larger atomic radius than sulfur? oxygen cadmium fl…
cadmio
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electronegativities of the elements na, al, p, and na follow a specific…
# Explicación: ## Paso 1: Comprender la tendencia de electronegatividad La electronegatividad aumenta a lo largo de un período en la tabla periódica. Esta es la capacidad de un át…
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when electrons are added to the outermost shell of a carbon atom, it fo…
an anión that has a larger radius.
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which statement describes an extensive property of matter? it changes w…
It changes with the amount of sample that is present.
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which shows the electron configuration for silicon (si)? ar 4s²3d¹⁰4p¹ …
[Ne] 3s²3p²
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when a strip of magnesium metal is touched to a flame, a bright light a…
# Breve explicación: Un cambio químico implica la formación de una nueva sustancia con propiedades diferentes. Cuando el magnesio se quema, reacciona con el oxígeno del aire para …
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what is the electron - configuration for helium (he)? 1s^1 1s^2 1s^22s^…
1s²
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which element would most likely have chemical properties similar to tha…
# Explicación breve: Los elementos de la misma columna de la tabla periódica tienen propiedades químicas similares. Magnesio (Mg) está en la columna 2. El calcio (Ca) también está…
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a piece of sodium metal can be described as a pure substance and a comp…
B. a pure substance and an element.
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a piece of sodium metal can be described as a pure substance and a comp…
B. a pure substance and an element.
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what is the predicted order of first ionization energies from highest t…
Li > Na > K > Rb
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the table gives the data that is needed to calculate the average atomic…
# Explicación: ## Paso 1: Convertir abundancias relativas a fracciones Multiplicar las abundancias relativas por 0.01. $19.91\% = 0.1991$, $80.09\%=0.8009$ ## Paso 2: Calcular el …
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the table gives the numbers of protons, electrons, and neutrons in four…
3
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multiple - choice question when co₂ reacts with water what does it crea…
carbonic acid, which causes the ocean to become more acidic.