Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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question 4 molarity is the number of moles of solute per volume of solu…
A. True
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it was a sunny sunday morning in october. ben sat on a bench in the par…
1. A sunny Sunday morning in October, a park 2. D. Man vs. Self 3. B. Man vs. Nature
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question 1 the process of helps solute particles become surrounded by s…
The first blank: solvation; The second blank: become surrounded by solvent molecules
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stopping the fentanyl trade will be highly difficult for world leaders.…
1. B. Many experts think the drug trade's huge profits make it likely that a crackdown in one place will just lead to new sources of supply. 2. D. studied 3. A. Fake versions of A…
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directions: answer the questions below. 1. a ____ is a process in which…
1. Reacción química 2. b. Productos 3. Evolución de gas, cambio de color, liberación o absorción de calor 4. b. Enlaces químicos
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question 2 of 12 > compare solution x to solution a, solution b, and so…
Solution A
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18. how many grams of nacl (molar mass= 58 g/mol) are needed to prepare…
D. 1.5 g ### 19.
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1. calculate the % water in cuso₄·5h₂o from the formula. 2. did you det…
$36.1\%$ ### 3.
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draw the molecular orbital (mo) electron diagram for the f₂⁺ molecular …
Draw an energy - level diagram with the above - mentioned orbitals in order of increasing energy. Place 2 electrons in $\sigma_{1s}$, 2 in $\sigma_{1s}^*$, 2 in $\sigma_{2s}$, 2 i…
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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 | 1.5 | | $Be_2^{+}$ | yes | paramagnetic | 0.5 | | $He_2$ | no |…
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chemistry h - koenig - 02 - 06 (lms) investigation test: the periodic t…
1. Na 2. Al, Mg ions 3. O
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which statements are true concerning elements in the same group of the …
A. They have similar properties. F. They have the same outer shell electron configuration.
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the search is now on for element with atomic number 119. based on perio…
D. It would most likely form cations when it reacts.
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study the following sketch of a molecular orbital (mo) in a homonuclear…
| Property | Answer | |--|--| | Write the symbol for this MO | $\pi^*$ | | Is this a bonding or antibonding MO? | antibonding | | What is the energy of this MO, compared to the en…
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1 according to kinetic - molecular theory, collisions between gas parti…
11. 4 12. 3 13. 2 14. 2 15. 4
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leaming target i can determine the number of valence electrons for elem…
Mistake 1: Incorrect electron - shell distribution. Oxygen has 8 electrons. The first shell should have 2 electrons and the second shell should have 6 electrons instead of the dis…
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exam 1 chapters 1 - 5 please, turn off your cell phone and use only pen…
1. T 2. T 3. F 4. A 5. C 6. C 7. B
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48) choose the pair of names and formulas that do not match. a) calcium…
48) E. Potassium sulfate: $(NH_4)_2SO_4$ 49) B. iodic acid 50) B. $I_2S_5$
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40) what is the atomic mass of the hydrogen isotope that contains 2 neu…
40) C 41) T 42) F 43) T 44) C 45) A 46) B 47) D
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true/false. write t if the statement is true and f if the statement is …
31. F 32. T 33. T 34. C. an anion 35. D. K⁺ 36. E. none of the above 37. C. 2 - 38. D. 8 protons and 10 electrons 39. B. atoms of the same element that have different number of ne…
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16) the standard si unit for temperature is: a) atmosphere, b) kelvin, …
16) B. Kelvin 17) B. 33.6 18) A. $1.75\times 10^{4}$ 19) A. 4.82 mL 20) A. $10^{-3}$ 21) T 22) F 23) T
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8) a sample of wood with a mass of 3.0 grams was burned in an open dish…
8. B 9. E 10. C 11. T 12. T 13. F 14. E 15. B
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please, turn off your cell phone and use only pencil. write your name o…
1. T 2. F 3. F 4. A. The carbon dioxide is forced to mix with the water by the presence of sugars. 5. C. a model that explains the underlying reasons for observations and laws 6. …
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at what temperature does iron turn into a gas? what does this tell you …
Iron turns into a gas at 2862 °C (5182 °F or 3035 K). This high boiling - point indicates that the attraction between iron's particles (atoms) is strong due to the presence of str…
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oxygen and nitrogen are both gases at room temperature. explain why oxy…
Oxygen has a greater molar mass than nitrogen. The greater number of electrons in oxygen molecules leads to stronger London - dispersion forces between its particles compared to n…
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a student was randomly given compounds i and f from the group of compou…
Brady's test (2,4 - DNP)
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a student was given from the list of the compounds below a, b and d bli…
A = Brady, B = haloform
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multiple answer 10 points from the list of structures below, which of t…
F
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1. provide the structural formulas for the following organic compounds:…
a) $CH_3C(CH_3)=C(CH_3)CH_3$ b) A 5 - membered ring with a Br on one carbon and an I on an adjacent carbon c) A benzene ring with $-CH_2CH(CH_3)_2$ attached to one of its carbons …
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marina is heating a solution in her chemistry lab. the temperature of t…
C. (4, 32)
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provide the structural formulas for the following organic compounds: a)…
a) $CH_3C(CH_3)=C(CH_3)CH_3$ b) Cyclopentane ring with Br at C - 1 and I at C - 2.
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what causes the styrofoam to disappear into the acetone?
Styrofoam (polystyrene) is soluble in acetone, and acetone breaks down its structure causing it to dissolve.
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what causes the styrofoam to disappear into the acetone? your answer wh…
1. Acetone dissolves the polystyrene in Styrofoam. 2. Iron oxide or other magnetic particles.
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what is it called when something dissolves into something else? liquidi…
D. Solubility
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2.4 atomic lewis structures name: directions: answer the following ques…
Elements in Group 1 have 1 valence electron and their Lewis - dot diagrams have 1 dot. Elements in Group 18 have a full outer shell (2 for He and 8 for others) and their Lewis - d…
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6. what is the schematic symbol for the toggle switch?
B.
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2. which of the following is not a schematic symbol for a switch?
B. The wavy - line symbol (b) is not a schematic symbol for a switch.
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select the schematic symbol for a fuse.
The second symbol from the top (the wavy - line element between two straight lines)
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additional details were added for this assignment. 4. because bunsen bu…
Personal and other protective equipment: goggles, laboratory coat Physical hazards: burns from hot equipment, electrical, open, exposed flame Chemical Hazards: none Environmental …
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read the text. air pressure is the pressure in a given area caused by t…
Altitude is lower, such as at sea level. - Air pressure is higher. Altitude is higher, such as at the top of Mount Everest. - Air pressure is lower.
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give the complete common name, including aleks data resource.
Glucose
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select the schematic symbol for a rotary switch.
The first schematic symbol (with multiple circular contact points and a moving element between them)
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select the schematic symbol for a slide switch.
The second option (the symbol with a slanted line connecting two circular terminals and another terminal below).
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read the text. you have probably heard of the ph scale, which measures …
Hydronium ions form in the solution - The solution becomes more acidic. Hydroxide ions form in the solution - The solution becomes more basic.
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17. boron has two naturally occurring isotopes boron - 10 and boron - 1…
Boron - 11 is more abundant on Earth.
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recall that all isotopes of an element have the same physical and chemi…
The average atomic mass of oxygen is approximately $15.9992$ amu.
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question 5.4.1 select all special safety considerations present for thi…
Personal and other protective equipment: goggles, laboratory coat Physical hazards: burns from hot equipment, electrical, open, exposed flame
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name: passion rose date: 10/1/25 why is water so freaking cool? how muc…
1. Water is cool because of its unique physical and chemical properties such as high heat - capacity, hydrogen - bonding, and solvent capabilities. 2. Only a small fraction of the…
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select the correct name: 10. na₂s sodium sulfate (purple) sodium sulfid…
10. sodium sulfide (orange) 11. magnesium nitride (yellow) 12. aluminum chloride (purple) 13. iron (II) oxide (pink) 14. copper (II) bromide (magenta) 15. potassium phosphide (gre…
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question 5.3.6 use the five lighting the bunsen burner with a first lig…
a. safety lighter, Bunsen burner b. closed, yellow
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no additional details were added for this assignment. base - wide and h…
Air intake collar - 1, Air ports - 3, Gas intake - 2
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when naming an acid comprised of an anion such as perchlorate, the pref…
C. perchloric acid
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which of the following generally specifies the name of an oxyacid where…
1. <modified anion name>ous acid 2. <sulfur>, <phosphor>
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which of the following generally specifies the name of a binary acid su…
Question 1: Hydro<modified element name>ic acid Question 17: <modified anion name>ic acid
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question 5.2.3 there are two solutions, each containing cations of only…
First solution: Potassium cations Second solution: Strontium cations
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when naming binary molecular compounds, the name of the more__________ …
1. metallic, -ide 2. hydrogen ions
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question 12 1 pts the roman numeral in iron(ii) chloride specifies ____…
Question 12: the charge on the metal cation Question 13: True
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iron is a metal with variable ionic charges and can exist as either a _…
Question 1: D. 2+, 3+ Question 2: False
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most of the and some main group metals can form two or more cations wit…
1. D. transition metals 2. B. Roman numeral
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most of the____ and some main - group metals can form two or more catio…
1. D. transition metals 2. B. Roman numeral
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question 5.1.10 an element in an electrical discharge produced this bri…
Sr
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match the following everyday ionic compounds with their common uses. so…
sodium chloride: ordinary table salt sodium hypochlorite: active ingredient in household bleach calcium carbonate: ingredient in antacids sodium hydroxide: lye; used as drain clea…
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in a binary ionic compound, the name of the anion is given as the name …
For the first question: C. -ide For the second question: D. cation, anion
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question 3 when naming ionic compounds the ______ name is followed by t…
Question 3: A. cation, anion Question 4: C. metal cation
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which line do you draw if the atom is coming in front of the atom? norm…
Wedged line
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the rules for naming chemical compounds are known collectively as monik…
Question 1: D. nomenclature Question 2: B. binary
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how are the masses on the periodic table determined? why? most elements…
The masses on the periodic table are average atomic masses, calculated as weighted - averages of the masses of an element's naturally - occurring isotopes based on their relative …
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how much pure acid should be mixed with 6 gallons of a 50% acid solutio…
4
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pregunta 1 de 25 ¿qué dice el principio de le châtelier acerca de alter…
A. Un sistema cuyo equilibrio se ha alterado se desplazará para restablecer el equilibrio.
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¿qué es una constante de equilibrio? a. la cantidad de energía necesari…
B. La relación entre las concentraciones de equilibrio de los productos y las concentraciones de los reactivos.
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¿cuál de las siguientes es la base conjugada de h₃po₄? a. hpo₄²⁻ b. h₂p…
# Explicación breve: La base conjugada de un ácido se obtiene cuando el ácido dona un protón ($H^+$). El ácido $H_3PO_4$ al donar un protón se convierte en $H_2PO_4^-$. # Respuest…
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si el ph de una solución es 5,3 ¿cuál es el poh? a. 9.3 b. 4.7 do. 5.3 …
D. 8.7
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pregunta 1 de 25 ¿cuál de las siguientes es una característica de un ác…
# Breve explicación: Los ácidos fuertes se disocian completamente en agua, liberando iones H⁺. Conductividad en agua es alta debido a la presencia de iones. No reaccionan con agua…
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¿cómo afecta el aumento de temperatura a las colisiones entre moléculas…
B. El número de colisiones con suficiente energía para reaccionar aumenta.
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¿cuál de los siguientes valores de k<sub>a</sub> representa el ácido má…
DO. $K_a = 1.62\times10^{-12}$
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determinar la velocidad de una reacción que sigue la ley de velocidad: …
D. 5,4 (mol/L)/s
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¿qué hacen los ácidos en solución? a. aumentan el ph. b. forman iones h…
D. Aumentan la [H⁺]
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¿cuál es k<sub>eq</sub> para la reacción 2hcl( g)? = h2 ( g)+ cl2 ( g)?…
# Explicación: ## Paso1: Definir constante de equilibrio Para una reacción química general $aA + bB ightleftharpoons cC + dD$, la constante de equilibrio $K_{eq}=\frac{[C]^c[D]^d}…
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multiple choice question some suspected causes of ______ intellectual d…
C. cultural - familial
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¿qué ecuación se utilizaría para calcular la constante de velocidad a p…
# Explicación: ## Paso1: Analizar cada ecuación La ecuación A es la ecuación de Arrhenius para la constante de velocidad en función de la energía de activación, pero no se basa di…
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¿qué es un buffer? a. un par conjugado ácido - base que cambia la veloc…
# Breve Explicación: Un buffer es una solución que contiene un par conjugado ácido - base y su función principal es resistir cambios en el pH cuando se agregan pequeñas cantidades…
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¿cómo se comparan los cambios de temperatura y energía de activación en…
D. Los cambios de temperatura y energía de activación tienen efectos opuestos en la velocidad de reacción.
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¿cómo se calcula el ph de una solución? a. el ph es el logaritmo negati…
# Breve explicación: El pH de una solución se define matemáticamente como el logaritmo negativo de la concentración de iones hidronio [H⁺]. Esto se utiliza para cuantificar la aci…
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pregunta 1 de 25 ¿qué hace que la velocidad de reacción disminuya a med…
# Breve Explicación: La velocidad de una reacción química está directamente relacionada con la concentración de los reactivos. A medida que la reacción progresa, los reactivos se …
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¿qué significa si $k_{eq}=1$? a. los productos y los reactivos se favor…
A. Los productos y los reactivos se favorecen por igual en la reacción.
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¿cuál es $k_a$ para $hno_2(aq)? ightleftharpoons h^+(aq)+no_2^-(aq)$? a…
D. $K_a=\frac{[H^+][NO_2^-]}{[HNO_2]}$
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¿cuál de las siguientes opciones describe mejor una reacción ácido - ba…
D. Ácido + base ⇌ base conjugada + ácido conjugado
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pregunta 1 de 26 ¿cuál de las siguientes opciones define mejor una solu…
D. Una solución con un pH inferior a 7
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what do these two changes have in common? baking cookies cellular respi…
C. Both conserve mass. D. Both are chemical changes.
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what do these two changes have in common? a log decomposing in the wood…
C. Both are chemical changes. D. Both conserve mass.
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what do these two changes have in common? water evaporating from a pudd…
Both are changes of state.
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what do these two changes have in common? stapling an envelope shut usi…
# Brief Explanations: Stapling an envelope and using a magnet to pick up iron are physical changes. They don't change the chemical composition of substances, so mass is conserved.…
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what do these two changes have in common? a dinosaur bone turning into …
C. Both are chemical changes.
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what do these two changes have in common? boiling sugar to make caramel…
Both are chemical changes. Both conserve mass.
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what do these two changes have in common? mixing sand and water mixing …
Both are only physical changes.
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what do these two changes have in common? a crayon melting in the sun w…
A. Both are only physical changes.
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what do these two changes have in common? a piece of apple turning brow…
Both are chemical changes.
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what do these two changes have in common? melting glass water boiling o…
A. Both are only physical changes. C. Both are caused by heating.
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what do these two changes have in common? sewing an apron snowflakes fo…
Both are only physical changes.
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5. ammonium nitrate, a substance commonly used as a fertilizer, can dec…
$2.45\times 10^{9}$ L