Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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what is the purpose of the water bath in this experiment? select one: t…
To provide a safe and effective way to control and uniformly change the temperature of the sealed flask.
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question 5 of 10 points possible: 1.00 not yet answered to determine th…
Natural Log of Pressure ($\ln P$) vs. Inverse Temperature ($1/T$ in $K$)
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question 3 of 10 > points possible: 1.00 at a certain temperature, the …
10 kPa
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what is the ultimate goal of measuring the pressure of ethanol vapor at…
To calculate the heat of vaporization ($\Delta H_{vap}$) of ethanol.
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extension questions 15. it is often useful to separate matter. physical…
a. Physical separation b. Chemical separation c. Mixtures d. Compounds 16a. Drawing A is the best representation of an element because elements are composed of many identical atom…
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model 1 — atoms, particles, and molecules read this! elements are defin…
11. Elements: Drawings with only one - type of atom (list the codes of such drawings). Compounds: Drawings with two or more types of atoms (list the codes of such drawings). 12. E…
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model 1 — atoms, particles, and molecules 7. appoint one group member t…
Pure Substances: List the codes of drawings with all identical particles. Mixtures: List the codes of drawings with different types of particles.
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model 1 — atoms, particles, and molecules 8. identify which drawings fr…
Without seeing the specific drawings from Question 7, we cannot list the codes. But in general, if a drawing has only one type of atom or one type of molecule, its code would go u…
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model 1 — atoms, particles, and molecules 7. assist one group - member …
8. Pure Substances: [List drawings with identical particles]; Mixtures: [List drawings with different - type particles] 9. Pure substances have single or fixed - combination formu…
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question 9 6 pts how many moles of silver ions are present in 32.46 g o…
Question 9: 0.191 mol Question 10: 0.0136 mol
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question 7 6 pts how many moles are present in 140. g of cacl₂? 1.46 mo…
Question 7: C. 1.26 mol Question 8: C. $4.62\times 10^{21}$ atoms
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question 5 6 pts how many o atoms are present in 1.04 mol of mgso4? 1.0…
$2.51\times 10^{24}$ atoms ### Question 6
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question 3 what is the mass of 1.80 mol of al(no₃)₃? 272 g 383 g 257 g …
383 g ### Question 4
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question 1 6 pts what is the mass of 0.360 mol of hcl? 13.1 g 101 g 2.1…
Question 1: A. 13.1 g Question 2: B. 401 g
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colligative properties (freezing point depression, boiling point elevat…
1. True 2. inversely proportional
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colligative properties are four properties that are dependent on the id…
False
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3. if a small amount of the unknown fails to dissolve in the water, wil…
The calculated molecular weight will be too high.
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match the following terms with the best description. - concentration of…
1. Solvent in a less concentrated solution passes through a membrane into a more concentrated solution: Osmosis 2. Has an inversely proportional relationship with temperature: Non…
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identify the following statements as true or false. a 2.0% nacl solutio…
1. False 2. False 3. True 4. True 5. False 6. True
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arrange the solutions in order from highest freezing temperature to low…
pure water, water with 1/2 teaspoon of dissolved sugar, water with 1 teaspoon of dissolved sugar, water with 2 teaspoons of dissolved sugar
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question 1 the diaphragm is superior to the heart, and the lungs are me…
Question 1: B. False Question 2: A. True Question 3: A. True
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assignment 2 part 1 9 marks choose 9 of 10 (lesson 4a & 4b) how many at…
a) 1 selenium atom b) 3 cobalt atoms, 2 phosphorus atoms, 8 oxygen atoms
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quiz 4 question 1 what is the name of co+2? question 2 what is the symb…
Question 1: Cobalt(II) ion Question 2: $Cl_2$ Question 3: $PbS_2$ Question 4: Iron(II) iodide Question 5: $(NH_4)_2SO_4$ Question 6: Magnesium hydroxide Question 7: $Xe_8F_4$ Ques…
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2. if you spill a little of the unknown as you mix it with the water, w…
The calculated molecular weight will be too low because the presence of extra water from the spillage dilutes the unknown, reducing the magnitude of the colligative property chang…
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1. if you spill a little of the unknown as you mix it with the water, w…
The reported freezing point will be too high because there is less solute present in the water due to the spill, resulting in a smaller freezing - point depression.
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read \the eagle\ by alfred, lord tennyson. he clasps the crag with croo…
aab aab
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4. add 2 to 3 drops of phenolphthalein indicator to the erlenmeyer flas…
$73.2\ g/mol$
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5. swirl the flask in order to stir the solution in the erlenmeyer flas…
The molar mass of the unknown acid for Trial 1 is $75.0\ g/mol$
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a food worker puts on a clean pair of gloves before cleaning and saniti…
d. Cleaning chemicals on the food worker's gloves
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for each chemical reaction listed in the table below, decide whether th…
| reaction | oxidized | reduced | neither oxidized nor reduced | |--|--|--|--| | $C(s)+O_2(g)\to CO_2(g)$ | C | | | | $Na_2CO_3(s)+H_3PO_4(aq)\to Na_2HPO_4(aq)+CO_2(g)+H_2O(l)$ | …
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for each chemical reaction listed in the table below, decide whether th…
1. reduced 2. oxidized 3. neither oxidized nor reduced 4. neither oxidized nor reduced
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for each chemical reaction listed in the table below, decide whether th…
| reaction | highlighted atom is being... | |--|--| | $2CrO_{4}^{2 - }(aq)+2H_{3}O^{+}(aq)\to Cr_{2}O_{7}^{2 - }(aq)+3H_{2}O(l)$ | neither oxidized nor reduced | | $2Cl^{-}(aq)+2H…
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the following chemical reaction takes place in aqueous solution: agf(aq…
Ag⁺(aq)+Br⁻(aq)→AgBr(s)
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a food worker is putting chemicals into clean spray bottles. what must …
B. The common name of the chemical
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new utrecht high school - regents chemistry mr. christodoulou name: prt…
Part I: Chemical change because the sodium polyacrylate turns into a snow - like substance and can't go back to its original form. Part II: 1. P 2. P 3. C 4. P 5. C 6. C 7. C 8. P…
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new utrecht high school - regents chemistry name date period physical a…
Part I: Physical change. Sodium polyacrylate absorbs water through a physical process of swelling without changing its chemical composition. Part II: 1. P 2. P 3. P 4. P 5. C 6. P…
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the following chemical reaction takes place in aqueous solution: snso₄(…
$\text{Sn}^{2 + }(aq)+\text{S}^{2 - }(aq) ightarrow\text{SnS}(s)$
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which rule was broken? drag pauli exclusion principle hunds rule aufbau…
Pauli Exclusion Principle
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physical and chemical changes homework 1. which statement describes a c…
(1) C. Magnesium reacts with an acid. (2) C. a homogeneous mixture (3) D. physical properties (4) B. Oxygen can combine with a metal to produce a compound. (5) D. A cool, shiny me…
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which rule was broken? drag pauli exclusion principle hunds rule aufbau…
Pauli Exclusion Principle
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what volume is indicated on each of the graduated cylinders below? the …
a) 55 mL b) 4.2 mL c) 25 mL d) 17 mL e) 77 mL f) 4.6 mL g) 35 mL h) 3.6 mL i) 46 mL
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which rule was broken? drag pauli exclusion principle hunds rule aufbau…
Pauli Exclusion Principle
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match the rule... in the ground state of an atom, electrons fill lower …
"Two electrons in the same orbital cannot exist in the same state and will have opposite spins." - Pauli Exclusion Principle "Electron - pairing only occurs after all orbitals in …
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1. which is a chemical property of sodium? (a) soft metal, easily cut w…
1. (c) forms compounds with chlorine 2. Chemical change: (c) burning and rusting; Physical change: (a) freezing and melting 3. (a) Hydrogen gas burns in air
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the following chemical reaction takes place in aqueous solution: snbr₂(…
$\text{Sn}^{2 + }(aq)+\text{S}^{2 - }(aq) ightarrow\text{SnS}(s)$
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some chemical reactants are listed in the table below. complete the tab…
| species | oxidation state of highlighted atom | | ---- | ---- | | VO(s) | + 2 | | \(Fe^{2+}(aq)\) | + 2 | | \(CF_{4}(l)\) | + 4 | | \(H_{3}O^{+}(aq)\) | - 2 |
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some chemical reactants are listed in the table below. complete the tab…
| species | oxidation state of highlighted atom | | ---- | ---- | | $OH^-(aq)$ | - 2 | | $O_2(g)$ | 0 | | $CuCl(s)$ | + 1 | | $HPO_4^{2 - }(aq)$ | + 5 |
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some chemical reactants are listed in the table below. complete the tab…
| species | oxidation state of highlighted atom | | ---- | ---- | | Fe³⁺(aq) | +3 | | Cl₂(g) | 0 | | H₃O⁺(aq) | +1 | | NH₄⁺(aq) | - 3 |
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some chemical reactants are listed in the table below. complete the tab…
| species | oxidation state of highlighted atom | | ---- | ---- | | $Cu_2O(s)$ | +1 | | $OH^-(aq)$ | -2 | | $I^-(aq)$ | -1 | | $CO_2(g)$ | +4 |
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some chemical reactants are listed in the table below. complete the tab…
| species | oxidation state of highlighted atom | | ---- | ---- | | $Ag^+(aq)$ | + 1 | | $SiO_2(s)$ | + 4 | | $H_2O(l)$ | - 2 | | $H_2(g)$ | 0 |
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question 2 1 pts which of the following is an example of potential rath…
a molecule of glucose
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question 1 a system in chemical equilibrium ... consumes energy at a st…
consumes or releases energy, depending on whether it is exergonic or endergonic.
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question 12 some food guides classify dried beans and peas with low - f…
fruits and vegetables
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1. identify the three elements in the composite. select all that apply:…
helium, mercury (assuming we need to pick two more correct ones based on the given feedback and the requirement of three elements)
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in piagets theory of cognitive development, a childs schemas are adjust…
A. both assimilation and accommodation
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to determine the concentration of a solution of nitrous acid, a 100.0 -…
$0.03802\ M$
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an aqueous solution of perchloric acid is standardized by titration wit…
$0.0783\ M$
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in the laboratory you dissolve 18.6 g of iron(ii) bromide in a volumetr…
Molarity of the solution: $0.173\ M$ Concentration of iron(II) cation: $0.173\ M$ Concentration of bromide anion: $0.346\ M$
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how many grams of barium iodide, bai2, must be dissolved to prepare 250…
$14.7$
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in the above redox reaction, use oxidation numbers to identify the elem…
Name of the element oxidized: Xenon Formula of the oxidizing agent: $Cu(OH)_2$ Name of the element reduced: Copper Formula of the reducing agent: $Xe$
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what is the oxidation state of: a. nitrogen in no₃⁻? b. sulfur in h₂so₃…
A. +5 B. +4 C. +2
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write a net ionic equation for the reaction that occurs when excess hyd…
$CaCO_3(s)+2H^+(aq) ightarrow Ca^{2 +}(aq)+H_2O(l)+CO_2(g)$
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classify each of the following as a strong acid or a weak acid and indi…
1. Weak acid, $HClO$ 2. Weak acid, $HNO_{2}$ 3. Weak acid, $H_{2}SO_{3}$
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consider the reaction when aqueous solutions of chromium(iii) bromide a…
$Cr^{3 +}(aq)+3OH^{-}(aq) ightarrow Cr(OH)_3(s)$
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the compound potassium sulfate is a strong electrolyte. write the trans…
$K_2SO_4(s) ightarrow2K^{+}(aq)+SO_{4}^{2 - }(aq)$
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classify the following reaction and balance the equation by entering th…
Reaction Type: Acid - base neutralization Balanced equation coefficients: 2, 1, 1, 2
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write the empirical formula of at least four binary ionic compounds tha…
ZnF₂, ZnO, PbF₄, PbO₂
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consider the reaction: 2 na₃po₄(aq) + 3 cu(no₃)₂(aq) → cu₃(po₄)₂(s) + 6…
$0.719$
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the concentration of sn²⁺ in a solution is determined by titrating it w…
\(0.05128\)
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0.0500 mol fe2+ react 0.0100 mol mno4 - react how many moles of fe2+ re…
5
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what is the quantity of mno4 - ion reacting, in moles? 100 ml of a 0.50…
$0.01$
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what is the quantity of fe2+ ion reacting, in moles? 100 ml of a 0.500 …
$0.0500$
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calculate the volume of 0.850 - m naoh solution needed to completely ne…
$19.3\ mL$
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consider the reaction: 2 nabh4(aq) + h2so4(aq) → 2 h2(g) + na2so4(aq) +…
75
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calculate the concentration of the final solution, in mol/l. 8.00 x 10^…
$1.60\times10^{-4}$
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calculate the amount (mol) of solute delivered to the dilute solution. …
$8.00\times 10^{-5}$
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write the empirical formula of at least four binary ionic compounds tha…
FeI₂, FeS, AuI₃, Au₂S₃
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a solution is made by dissolving 30 g of calcium acetate, ca(ch3coo)2, …
$[CH_3COO^-]=1.52\ mol/L$, $[Ca^{2+}]=0.76\ mol/L$, $[Ca(CH_3COO)_2]=0.76\ mol/L$
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a solution is made by dissolving 27.5 g of ammonium cyanide, nh₄cn, in …
2.50 mol/L
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calculate the amount (mol) of solute, k₂cro₄, added to the solution. th…
If the mass of $K_2CrO_4$ is 194.19 g, the amount of solute is 1 mol. (Note: In a real - world problem, you need to be given the actual mass of $K_2CrO_4$ added to the solution to…
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write the empirical formula of at least four binary ionic compounds tha…
$CaBr_{2}$, $CaO$, $NiBr_{4}$, $NiO_{2}$
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write the empirical formula of at least four binary ionic compounds tha…
MgCl₂, MgS, FeCl₂, FeS
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read \the eagle\ by alfred, lord tennyson. what is the rhyme scheme of …
aaa baa
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balance the chemical equation below using the smallest possible whole -…
$2NH_3(g)+3O_2(g)+2CH_4(g) ightarrow2HCN(aq)+6H_2O(l)$
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answer the following. (a) a certain solution has a hydrogen ion concent…
(a) 0.0000589 (b) $4.7\times10^{4}$
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what is the total number of oxygen atoms on the right - hand side of th…
16
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what is the total number of phosphorus atoms on the right - hand side o…
4
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complete the table below. some binary molecular compounds name chemical…
| name | chemical formula | |--|--| | carbon monoxide | $CO$ | | carbon dioxide | $CO_2$ | | dichlorine monoxide | $Cl_2O$ | | carbon tetrachloride | $CCl_4$ |
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question 11 which is a change in bone architecture or mass related to a…
All of the choices are correct.
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complete the table below. some binary molecular compounds name chemical…
| name | chemical formula | |--|--| | boron monophosphide | BP | | sulfur dioxide | SO₂ | | dibromine monoxide | Br₂O | | silicon dioxide | SiO₂ |
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deep inside the emotional center of the brain, an almond - shaped struc…
# Breve explicación: El texto indica que cuando el cuerpo enfrenta una crisis, como confrontar a un acosador, el cortisol es enviado en una misión de emergencia para llenar los mú…
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danny is a 37 y/o male who returns to the clinic for review of lab resu…
None of the above options are correct as they are inappropriate treatments for the presented condition.
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introduction problem: what is the most efficient flame for a bunsen bur…
# Explicación: ## Paso 1: Comprender el funcionamiento del quemador de Bunsen El gas natural entra, se mezcla con aire y quema. ## Paso 2: Considerar los ajustes Ajustando correct…
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find δu° and δh°reaction for the following reaction: 2 nh3(g) → n2(g) +…
$\Delta H^{\circ}=91.8$, $\Delta U^{\circ}=86.8$ kJ
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question 4 (1 point) find δu° and δh°reaction for the following reactio…
$\Delta H^{\circ}=91.8,\Delta U^{\circ}=86.8\ kJ$
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question 3 (1 point) what is the standard enthalpy of formation for n2 …
Zero
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question 2 (1 point) which equation would you use to determine the stan…
$\Delta H^{\circ}_{reaction}=\sum\Delta H^{\circ}_{f\text{ products}}-\sum\Delta H^{\circ}_{f\text{ reactants}}$
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this is the bohr model of an atom or ion. using the periodic table, com…
This Bohr model represents a cation of the element carbon. It has a mass number of 12 and a charge of + 2.
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select the subatomic composition of a gold(i) ion (au⁺) with a mass num…
79 protons, 118 neutrons, 78 electrons
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select the subatomic composition that describes an arsenide ion (as³⁻) …
33 protons, 42 neutrons, 36 electrons