Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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butane is trapped as described in the procedure for this experiment in …
\( \approx 60.8 \) (or more accurately, with precise calculation, around 58 - 61 depending on rounding; if using exact steps, closer to 58.12 but with given data, ~60.8)
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using the solubility rules given, predict if the ionic compound coco₃ i…
Insoluble (the option labeled "Insoluble")
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define the term \law of definite proportions.\ select one: a grouped co…
the third option (the option with "a chemical compound contains exactly the same proportion of elements by mass")
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balance the following reaction between magnesium nitride and water. if …
The coefficients are: \( \text{Mg}_3\text{N}_2 \): 1, \( \text{H}_2\text{O} \): 6, \( \text{NH}_3 \): 2, \( \text{Mg(OH)}_2 \): 3. So filling in the "Choose..." dropdowns: - First…
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what is the molarity of 25 ml a hydrochloric acid solution that contain…
0.800
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define the term \heterogeneous mixture.\ select one: a mixture where th…
B. a mixture where the components can be differentiated by sight alone
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lesson 8 punctuating parenthetical elements introduction when you want …
For the first guided practice sentence: Elizabeth Blackwell (1821 - 1910) grew up in a time when women were not welcome in many professions. (Applying parentheses as the required …
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identify and balance - 17 1) h₃po₄ → h₄p₂o₇ + h₂o 2) ch₂ + o₂ → h₂o + c…
1. \( 2\ce{H3PO4} = \ce{H4P2O7} + \ce{H2O} \) 2. \( 2\ce{CH2} + 3\ce{O2} = 2\ce{H2O} + 2\ce{CO2} \) 3. \( 2\ce{AgNO3} + \ce{Zn} = 2\ce{Ag} + \ce{Zn(NO3)2} \) 4. \( \ce{FeCl3} + 3\…
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the lead chemist wants you to determine what is happening to the freedo…
Chemistry (subfield of Natural Science)
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sustainability refers to ________. the ability for humans to survive th…
D. using Earth's natural resources in a way that maintains their suitability (assuming the options are labeled A - D with D being the last option)
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element | valence electrons | lewis structure sodium | this element has…
# Explanation: ## Step1: Analizar Sodio (Na) Los elementos del Grupo 1 tienen 1 electrón de valencia. Sodio está en el Grupo 1. Valencia: 1; Grupo: 1. ## Step2: Analizar Cloro (Cl…
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question 14 1 pts which of the following statements about minerals is f…
The statement "They are organic molecules made of carbon like protein, carbohydrates, and lipids." is false. So the option with this statement (the fourth option in the list: "The…
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(4) calculate $\\triangle_{\\text{r}}g^{\\theta}_{\\text{m}}$, judge th…
\(\Delta_{r}G_{m}^{\ominus}=-514.382\space\mathrm{kJ\cdot mol^{-1}}\), and the reaction is spontaneous.
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question 10 of 10 mr. maxwell, an english teacher, thinks all students …
B. self - fulfilling prophecy.
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question 5 of 10 bella doesnt believe in cheating on school work, but t…
C. cognitive dissonance.
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question 3 of 10 when we look at others behavior, we tend to overemphas…
A. the fundamental attribution error.
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question 1 of 10 when jose did poorly on his history exam, the teacher …
D. a dispositional attribution.
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how many electrons are located in the outermost orbit in the bohr model…
3 (corresponding to the option with "3")
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1 multiple choice 2 points which atom has the higher electronegativity?…
Atom A
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what would the ph be if the concentration of $\\ce{h3o+} = 2 \\times 10…
3.70 (the option with "3.70") ### Question 14 (Titration pH at equivalence)
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atoms and molecules (crossword puzzle with words like proton, isotope, …
Chemistry (subfield of Natural Science)
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question 10 (1 point) which of the following statements is correct? ○ c…
A. $\ce{CH_{3}COO^{-}(aq)}$ is a stronger conjugate base of weak acid $\ce{CH_{3}COOH(aq)}$ ### Question 11
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use the following information to answer the next question. ethanoic aci…
2.72 ### Second Question (NH₃ as Bronsted Acid)
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homework 2 : the decomposition of ethane (c₂h₆) to methyl radicals is a…
The half - life of the reaction is approximately \(\boldsymbol{21.6}\) minutes (or more precisely around 21.55 minutes).
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2 types of bonds (continued) check your progress 8. compare and contras…
Ionic bonds involve the transfer of electrons from a metal to a non - metal, forming ions (cations and anions) held by electrostatic forces. Covalent bonds involve non - metals sh…
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evaluate your friend says that nonpolar molecules cannot contain polar …
I do not agree. A nonpolar molecule can contain polar bonds. For example, in $\ce{CO_2}$, the $\ce{C=O}$ bonds are polar (due to electronegativity difference between C and O), but…
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use the following information to answer the next question. hydrogen pho…
$\boldsymbol{\frac{x^3 y}{z}}$ (corresponding to the option $\frac{x^3 y}{z}$)
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use the following information to answer the next question. a solution w…
11.47 ### Second Question (Bronsted-Lowry Acid/Base)
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get it? explain what is the charge of an ionic compound? compare ionic …
The charge of an ionic compound is zero (neutral) because the positive charge of cations balances the negative charge of anions. ### Second Task: "Compare ionic and covalent bonds…
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purpose for reading: todays reading is \i wandered lonely as a cloud\ b…
It mirrors the orderly and harmonious beauty of nature.
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eddy finds a friend by a. gautam this is how i dance— not the way you g…
B. Every other line in each stanza have the same rhyme.
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list the metric prefixes in order from least to greatest. the acronym o…
s #### Metric Prefixes (Least to Greatest - 7 common ones) 1. Micro 2. Milli 3. Centi 4. Deci 5. Deca 6. Hecto 7. Kilo #### Seven Types of Physical Properties 1. Color 2. Odor 3. …
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complete the steps in the formation of a potassium ion. 1. an atom of p…
1. An atom of potassium has \(\boldsymbol{1}\) electron in its \(\boldsymbol{outer}\) (or 4th) energy level. 2. A potassium atom \(\boldsymbol{loses}\) one electron in its outer e…
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recall the definition of the review vocabulary term. atom write the cor…
1. ion 2. ionic bond 3. covalent bond 4. molecule 5. non - polar covalent bond 6. polar covalent bond 7. polar molecule 8. non - polar molecule Recall of "atom": The basic unit of…
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list the metric prefixes in order from least to greatest. the acronym o…
1. milli 2. centi 3. deci 4. (base unit, e.g., meter, gram, liter) 5. deca 6. hecto 7. kilo ### Second Sub - Question (Seven Types of Physical Properties)
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incorrect; try again; one attempt remaining you sorted 1 out of 12 item…
The correct matches are: - Alcohol: is polar and makes compounds more soluble in water - Carboxylic acid: acts as an acid; carries negative charge - Aldehyde: may be a structural …
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which sentence contains parallel structure? mekhi was finally finished …
Mekhi finished his chemistry homework and then finished his essay
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joelle is a manager at a construction company, and she is interested in…
\( \ce{C_{27}H_{36}N_2O_{10}} \)
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question 3 (1 point) use the following information to answer the next q…
$3\times 10^{-11}$ mol/L (corresponding to the option "3×10⁻¹¹ mol/L")
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28. a slender graduated tube used in a lab for measuring and transferri…
b. Graduated cylinder ### Question 29
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22. which of the following would be classified as a homogeneous mixture…
a. Orange juice ### Question 23
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15. how many meters is 8.72 centimeters? a. 872 b. 0.0872 c. 8.72 d. 87…
b. 0.0872 ### Question 16
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7. which is the correct formula for density? a. volume x mass b. mass x…
d. Mass/Volume ### Question 8
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question 2 is this reaction mostly likely endothermic or exothermic? wh…
This reaction is mostly likely endothermic. Because in an endothermic reaction, energy is absorbed, and the graph (showing the change in a property like temperature or energy over…
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when the students combined 25 grams of reactant 1 with water, they coll…
The average rate of temperature change from 0 to 50 minutes is -0.32 °C per minute (or specific rate between points as calculated above). If the problem was to find the slope (rat…
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balance the following equations.... 1. 2mg + o₂ ---------> ______ mgo 2…
1. 2 2. 6 3. 3 4. 2; 3
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3. so3 ---------> 2so4 + o2 32+16(3) -> 2(32+16(4)) + 16(2) 144
The given chemical reaction is incorrect (formula and stoichiometry errors). A correct reaction example: \( 2\ce{SO_3} ightarrow 2\ce{SO_2} + \ce{O_2} \) (mass balanced: \( 2 \tim…
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convert 25 grams of naoh to moles. show your work! molar mass naoh = 40…
The number of moles of NaOH is $0.625$ moles.
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fill in the isotopes element | symbol | atomic number | atomic mass | n…
The table is filled using atomic structure relationships (Z = protons = electrons, A = Z + N). Key calculations include \( N = A - Z \) and \( Z = A - N \).
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convert 25 grams of naoh to moles. show your work! molar mass naoh = 40…
The number of moles of $\ce{NaOH}$ is $\boldsymbol{0.625}$ mol.
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part 1 are the following equations balanced? you do the math..... 1. 2n…
1. Balanced (Yes), 2. Not Balanced, 3. Not Balanced
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convert $1.20 \\times 10^{24}$ molecules of $\\ce{h_2o}$ to moles. show…
Approximately \( 1.99 \) moles (or \( 2.00 \) moles if using \( 6.02\times 10^{23} \))
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cecil is working with samples of chlorine (cl), oxygen (o), bromine (br…
D. silver
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which properties are characteristic of metalloids? ○ high electrical co…
intermediate conductivity and a high melting point (the fourth option in the list of choices)
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when an atom that has no charge loses two electrons, it becomes a posit…
A. positive ion
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who is known as the \father of modern chemistry\ because he first organ…
Antoine Lavoisier
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q2 chemistry: u4l3 lonic naming & formulas date: prepwork prepwork part…
| Atom | Neutral Atom Lewis Diagram | Predicted Charge of Ion | Ion Lewis Structure | Ion Name | |------------|----------------------------|-------------------------|-------------…
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which lists only metalloids? ○ arsenic (as), sulfur (s), and polonium (…
boron (B), germanium (Ge), and tellurium (Te)
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which element is most likely to be shiny? sulfur (s) boron (b) calcium …
C. calcium (Ca)
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scientists in a lab are working with two different samples of the eleme…
the mass number
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which property do metalloids share with nonmetals? both are brittle. bo…
A. Both are brittle.
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which determines the reactivity of an alkali metal? ○ its boiling and m…
D. its ability to lose electrons
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11) (partially visible question about a metal in group 1) a. there was …
b. Electrons ### Question 13
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joelle is a manager at a construction company, and she is interested in…
\( \ce{C_{27}H_{36}N_{2}O_{10}} \) (the first option)
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name julie mountz date 12/10/25 hour 2nd (atomic history/periodic table…
c. I, II, III, and IV ### Question 2
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name ______ date ______ lesson: history/periodic table/basic atomic str…
Chemistry (under Natural Science)
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while looking at xenon (xe) on the periodic table, a student needs to f…
A. directly up
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this is how sodium appears in the periodic table. the arrow is pointing…
atomic mass
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question 5 1 pts | | sample a | sample b | | boiling point | low | high…
B. an ionic compound
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how many total valence electrons should you use to draw ammonia (nh₃)? …
8
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match each formula with its compound name. be sure to use your periodic…
\( \text{BaBr}_2 \): Barium Bromide \( \text{Fe(MnO}_4\text{)}_3 \): Iron(III) Permanganate \( \text{Be(OH)}_2 \): Beryllium Hydroxide
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match the formula with its compound name. co is the formula for select …
- CO is the formula for carbon monoxide. - \( N_2O_5 \) is the formula for dinitrogen pentoxide. - \( H_2O \) is the formula for water (dihydrogen monoxide).
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lithium is a metal with an ionic charge of 1+ and oxygen is a nonmetal …
Oxygen needs two electrons to complete its valence shell. Lithium has one electron it can donate to allow it to have a stable valence shell. One oxygen atom will take the donated …
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which option correctly matches the characteristics of both ionic and co…
The first option (Ionic bonds occur between metals and non - metals; atoms gain or lose electrons. Covalent bonds occur between non - metals; atoms share electrons.)
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electrons that are being shared. which pair of atoms below has the stro…
C. \( \text{N}\equiv\text{N} \)
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covalent bonding is typically explained as a bond that forms when atoms…
B. Atoms are both trying to attract the same electrons, causing a situation where both atoms are pulled together.
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final step: identify at least 7 ways you use energy on a daily basis. c…
1. Using electrical energy for lighting rooms. 2. Converting chemical energy (from food) to kinetic energy when walking. 3. Using thermal energy from a heater to warm a room. 4. C…
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directions: read the passage below and then answer the questions that f…
A. Music ### Second Question:
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part d - rules of electron configurations what rule is being violated i…
### For Configuration (1): # Brief Explanations: The electron configuration for (1) has the 2p subshell with only 2 electrons (shown as two orbitals with paired electrons, but 2p …
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instructions: for each different type of energy listed below, provide i…
| Energy | Definition | Example | |-----------------|----------------------------------------------------------------------------|----------------------------------| | Thermal Ene…
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look at the following table. imagine that trisha determined the mass of…
71 g (corresponding to the option with 71g, likely the first option among the given choices for the mass of sodium sulfate)
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crack is considered more profitable than cocaine because? - crack high …
B. less cocaine is used to create the drug
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cocaine was first isolated (extracted from coca leaves) in 1859 by germ…
D. Albert Niemann
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already a star, calandrelli tells students to aim high by dan sullman 1…
B. to share information about one young woman’s personal achievements (assuming the options are labeled with letters, and this is the correct one based on the analysis)
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best viewed at 75% or 90%. a how many moles of zinc (in mol) are needed…
$1.24$ mol
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as for the medical uses of marijuana, it contains another chemical call…
B. CBD
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already a star, calandrelli tells students to aim high by dao stallman …
O memorize their presentations before they give them.
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already a star, calandrelli tells students to aim high by dan stillman …
C. to share information about one young woman’s personal achievements
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already a star, calandrelli tells students to aim high by des sellner 1…
A. ideal
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the chemical that causes intoxication or the \high\ in marijuana is cal…
C. THC
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you are running a reaction in lab. when you mix two solutions together,…
A. The reaction is exothermic, because it is releasing heat to the surroundings.
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multiple choice question the ______ perspective suggests when an indivi…
A. medical
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most of the polyatomic ions are oxyanions. from the prefix and root wor…
"Oxyanion" means a negatively - charged polyatomic ion that contains oxygen (a polyatomic anion with oxygen atoms).
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most of the polyatomic ions are oxyanions. from the prefix and root wor…
An oxyanion is a polyatomic anion that contains oxygen (e.g., sulfate $\ce{SO_4^{2-}}$, nitrate $\ce{NO_3^-}$ are oxyanions as they are negative ions with oxygen in their structur…
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question 48 consider the following (incomplete) reaction. how many l of…
3.08 L (corresponding to the option 3.08 L)
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a football that is inflated to maximum capacity while held inside a war…
A. volume and temperature are directly related; when one decreases, so does the other
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how many valence electrons will be found in an atom of bromine? 35 br b…
7 valence electrons (the option: 7 valence electrons)
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given the tabulated bond enthalpies, estimate the enthalpy of reaction …
-808 kJ (Option: -808 kJ)
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question 43 which bond would you expect to have the highest bond energy…
The \( \ce{C\equiv C} \) in \( \ce{C2H2} \)
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which bond would you expect to have the highest bond energy? ○ the c≡c …
The \( \ce{C≡C} \) in \( \ce{C2H2} \)