Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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question 7 (1 point) what functional group is shown below? amino group …
carbonyl group
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question 1 (1 point) monosaccharides are insoluble (dont dissolve) in w…
False
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hailey and a classmate just did poorly on a chemistry exam. hailey didn…
C) misinformation effect
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red cabbage color changes with ph ph color red light pink dark pink pur…
B. 6 ### 2)
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activity: the many shades of red cabbage as you work through the follow…
B. 7
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florin wants to go out on halloween, but he does not have a costume. hi…
D. Functional fixedness
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a - label the reactions as weak acid dissociation, strong acid dissocia…
1) a. strong acid dissociation; b. (no acid/base/salt, ions only) 2) a. weak acid dissociation; b. (no acid/base/salt, ions only) 3) a. strong base dissociation; b. (no acid/base/…
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which one of the following diseases is most likely to respond to antimi…
B. Whipple's disease
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match the molecular shapes with the lewis structures. choices bent line…
1. \(CH_4\) (first structure): tetrahedral. 2. \(NH_3\) (second structure): trigonal pyramidal. 3. \(BCl_3\) (third structure): trigonal planar. 4. (Assuming the fourth structure …
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question 3 1 pts watch the following video to see the structure of the …
C. 80% ### Question 4
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choose the best answers using the image. 11. choose the best answer usi…
label A
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question 1 peristalsis is regulated in part by the intrinsic stretch re…
A. gastrin ### Question 2
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10. choose the best answer using the periodic table. what is the correc…
The first option (the structure with \(N\) bonded to three \(F\) atoms, each \(F\) having three lone - pairs and \(N\) having one lone - pair) is the correct Lewis structure for \…
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compare the student text with the source. source: carolyn williams, \a …
No, it is not plagiarized.
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question 16 1 pts the purpose of peristalsis is to: break apart chunks …
B. propel food forward along the GI tract. ### Question 17
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what did nasa launch on august 5, 2011, to conduct in - depth examinati…
Juno the spacecraft
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question 5 what might scientists have to do to explore further whether …
Scientists might send missions to sample Enceladus's plumes for biosignatures (organic molecules, microbial evidence), analyze the subsurface ocean's chemistry and energy sources …
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a chemical engineer must report the average volume of a certain polluta…
8.5 L
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question 9 of 10 read these lines from emily dickinsons poem \324\ (\so…
D. abcb
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calculate the standard enthalpy of formation for diamond, given that ro…
1.9 $\frac{\text{kJ}}{\text{mol}}$
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when 1.103 g of naphthalene (c₁₀h₈) is burned in a constant - volume bo…
$\Delta U = -5153\ \text{kJ/mol}$ (wait, correction: original $\Delta U$ given as -5153? Wait no, recalculate: $4435\ \text{kJ} / 0.008606\ \text{mol} \approx 515300\ \text{J/mol}…
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for which of the following reactions does $delta h_{rxn}^{o}=delta h_{f…
$\text{P}_4(\text{white}) + 5\text{O}_2(g) ightarrow \text{P}_4\text{O}_{10}(s)$, $\text{S}(\text{rhombic}) + 3\text{F}_2(g) ightarrow \text{SF}_6(g)$, $\text{C}(\text{graphite}) …
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the enthalpy of combustion of benzoic acid (c6h5cooh) is commonly used …
48.3
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if the bond enthalpy of o₂(g) is 492 kj/mol, calculate δh°f for o(g). r…
246
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determine the amount of heat (in kj) associated with the production of …
$-2.73×10^5$
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if the standard enthalpy change for the reaction below is 157 kj/mol. c…
78.5
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select which of the following standard enthalpy of formation values is …
$\square$ H(g)
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from these data, mathrm{s}(\text { rhombic })+mathrm{o}_{2}(g) ightarro…
$0.30\ \frac{\text{kJ}}{\text{mol}}$
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below is the lewis structure of the chlorine (cl₂) molecule. :cl:cl: co…
bonding pairs: 1 lone pairs: 3
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write the chemical formula for this molecule: o || cl - se - cl
SeOCl₂
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the chemical structure of ethanol (ch₃ch₂oh) is shown below. highlight …
The oxygen atom (O) and the hydrogen atom (H) bonded to it in the structure (the rightmost O and H) should be highlighted.
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a quantity of $2.00×10^{2}$ ml of 0.862 m hcl is mixed with an equal vo…
\(28.7^\circ C\) (or more precisely \(28.74^\circ C\), but considering sig figs from given data, 3 sig figs in initial temp and concentrations, so \(28.7^\circ C\) or \(28.74^\cir…
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classify each chemical reaction: reaction hi(aq) + naoh(aq) → nai(aq) +…
1. HI(aq) + NaOH(aq) → NaI(aq) + H₂O(l): acid-base 2. Ca(s) + F₂(g) → CaF₂(s): combination 3. 2H₂O₂(l) → 2H₂O(l) + O₂(g): decomposition 4. Na₂S(aq) + FeCl₂(aq) → 2NaCl(aq) + FeS(s…
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arrange the compounds below in decreasing order of the ionic character …
1 (most ionic): KF 2: SeF₂ 3: SF₂ 4 (least ionic): F₂
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a sheet of gold weighing 12.0 g and at a temperature of 13.6 °c is plac…
\(48.0\)
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a 20.3 g sample of an unknown metal and a 28.5 g sample of copper, both…
\boxed{1.34}
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draw the lewis structure for a iodide monochloride (icl) molecule.
The Lewis structure of ICl is: :$\ddot{\text{I}}-\ddot{\text{Cl}}$: (Each atom has 3 lone pairs and shares 1 bond pair.)
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write the chemical symbols for three different atoms or atomic anions w…
Ne, O²⁻, F⁻
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you are given the following data: 2h(g)→h₂(g) δh°=-436.4 kj/mol 2br(g)→…
# Explanation: ## Step1: Analyze given reactions We have three reactions: 1. \(2\text{H}(g) ightarrow \text{H}_2(g)\) \(\Delta H^\circ = -436.4 \frac{\text{kJ}}{\text{mol}}\) 2. \…
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you are given the following data: 2h(g) → h₂(g) δh° = -436.4 kj/mol 2br…
# Explanation: ## Step1: Analyze given reactions and target reaction We have three given reactions and need to manipulate them to get the target reaction \( \text{H}(g) + \text{Br…
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a quantity of (2.00\times10^{2}) ml of 0.862 m hcl is mixed with an equ…
\(28.3^\circ C\) (or more precisely \(28.34^\circ C\) depending on sig figs, but 3 sig figs from given data: 2.00×10², 0.862, 0.431, 22.61, 56.2 – so 3 or 4? Wait, moles calculati…
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a 6.02 kg piece of copper metal is heated from 20.5 °c to 308.3 °c. cal…
\(667\ \text{kJ}\) (or \(6.67\times 10^{2}\ \text{kJ}\))
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select which of the following standard enthalpy of formation values is …
$\ce{CH4(g)}$ (the checkbox next to $\ce{CH4(g)}$ should be checked)
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a piece of silver with a mass 386 g has a heat capacity of 91.5 j/°c. w…
\(0.237\)
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consider the following decomposition reaction: 2nh₃(g) + 22.0 kcal → 3h…
\(5.76\times10^4\)
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identify the exothermic processes. check all that apply. n₂o₅(g) + h₂o(…
- $\ce{N2O5(g) + H2O(l) -> 2HNO3(l)}, \Delta H = -18.1$ kcal - $\ce{CO(g) + H2(g) + O2(g) -> CO2(g) + H2O(g)}, \Delta H = -525.$ kJ
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identify the exothermic processes. check all that apply. n₂o₅(g) + h₂o(…
$\boldsymbol{\ce{N2O5(g) + H2O(l) -> 2HNO3(l)}}$, $\Delta H=-18.1$ kcal $\boldsymbol{\ce{CO(g) + H2(g) + O2(g) -> CO2(g) + H2O(g)}}$, $\Delta H=-525$ kJ
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how many hydrogen atoms are present in 25.6 g of nitroglycerin c₃h₅n₃o₉…
Approximately $\boldsymbol{3.39 \times 10^{23}}$ hydrogen atoms.
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a 40.0 g sample of an unknown metal at 99.0 °c was placed in a constant…
\( \boxed{0.440} \) (wait, but let's check again. Wait, 40.0 is three sig figs, 70.6 is three, 1242.44 is from 65.0 (three), 4.18 (three), 11.4 (three), 4.4 (two). Wait, 4.4 is tw…
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a 40.0 g sample of an unknown metal at 99.0 °c was placed in a constant…
$0.441\ \frac{J}{g\cdot^\circ C}$
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you are given the following data: 2h(g)→h₂(g) δh°=−436.4 kj/mol 2br(g)→…
\(\boxed{-351}\) (or \(-350.7\) depending on rounding, but let's check the calculation again. Wait, maybe I made a mistake. Wait, let's recalculate the sum: \(-436.4 + (-192.5) + …
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you are given the following data: 2h(g)→h₂(g) δh°=-436.4 kj/mol 2br(g)→…
# Explanation: ## Step1: Analyze given reactions and target reaction We have three given reactions and need to manipulate them to get the target reaction \( \text{H}(g) + \text{Br…
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a quantity of ( 2.00\times10^{2}) ml of 0.862 m hcl is mixed with an eq…
\boxed{27.4}
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a quantity of $2.00\times10^{2}$ ml of 0.862 m hcl is mixed with an equ…
# Explanation: ## Step1: Calculate moles of H⁺ and OH⁻ Volume of HCl = \(2.00\times10^{2}\space mL = 0.200\space L\) Moles of H⁺ from HCl: \(n_{H^+}=M\times V = 0.862\space mol/L\…
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select which of the following standard enthalpy of formation values is …
A. $\text{HCl}(g)$, C. $\text{CH}_4(g)$
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a sheet of gold weighing 9.7 g and at a temperature of 19.2 °c is place…
$\boxed{52.3}$
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a 6.22 kg piece of copper metal is heated from 18.5 °c to 340.3 °c. cal…
771
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a piece of silver with a mass 393 g has a heat capacity of 93.1 j/°c. w…
\( 0.237 \)
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consider the following decomposition reaction: 2h₂o(g) + 484. kj → 2h₂(…
$\boxed{1.24 \times 10^3}$
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2so₂(g) + o₂(g) → 2so₃(g) + 199. kj your answer part 1 of 2 is this rea…
\(48.8\)
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a) how many atoms of h are in a molecule of c₆h₁₂o₆? b) how many moles …
12 ### Part (b)
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11. nitric acid is neutralized with potassium hydroxide in the followin…
29.7°C (rounded to three significant figures)
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which best explains how a heat pump can heat a room? cold air from the …
A. Cold air from the house is moved through pipes, where it absorbs thermal energy.
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what is the overall energy transformation in a coal - fired power plant…
B. chemical to electrical
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12. a student uses a coffee - cup calorimeter to determine the enthalpy…
$HBr(aq) + KOH(aq) ightarrow KBr(aq) + H_2O(l) \quad \Delta H = -57\ \text{kJ/mol}$
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2. a chemist wants to determine empirically the enthalpy change for the…
$-4.1\times10^2\,\text{kJ/mol}$
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1. what is the difference between a diluted solution and a concentrated…
A diluted solution contains a relatively small amount of solute relative to the solvent (or total solution), while a concentrated solution contains a relatively large amount of so…
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solve the following solutions stoichiometry problems: 1. how many grams…
12.4 g
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practice problems: 1. in a calorimetry experiment, 7.46g of potassium c…
17kJ/mol ### Problem 2
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which additional detail provided by the apa expands on the mayo clinics…
A. Exercise increases blood circulation to the brain and affects the stress-regulating HPA axis.
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to rent a certain meeting room, a college charges a reservation fee of …
$t < 10$
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6. how many ml of 0.715 m hcl is required to neutralize 1.25 grams of s…
33.0 mL
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13. determine the correct pairing of molecules based on their origin an…
d. Molecule A : Morphine, Source : Papaver somniferum, Use : Sedative and pain killer
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7. what minimum number of grams of oxalic acid monohydrate, h₂c₂o₄·h₂o,…
0.0945 g
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8. in daltons atomic model, atoms are the smallest possible particles o…
Dalton's idea that atoms are the smallest particles of an element is partially refuted (atoms are divisible into sub - atomic particles like electrons, protons, neutrons) and part…
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6. write lewis structures for the following. show all resonance structu…
a) $\text{NO}_2^-$: Two resonance structures: central N bonded to two O (one double, one single), lone pairs on O; double bond alternates between O atoms. b) $\text{NO}_3^-$: Thre…
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7. complete the chart below: xef4 pcl5 so2 number of lone pairs of elec…
| Property | XeF₄ | PCl₅ | SO₂ | |----------|------|------|-----| | LP | 2 | 0 | 1 | | EG | 6 | 5 | 3 | | GA | Octahedral | Trigonal bipyramidal | Trigonal planar | | MS | Square …
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21. the term that describes an inadequate supply of oxygenated blood to…
ischemia.
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(c) h₃c—ch₂—ch₂—ch—ch₂—ch₂—oh h₂c—ch₃ spell out the full name of the co…
4 - ethylheptanol
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7. complete the chart below: xef4\tpcl5\tso2 number of lone pairs of el…
| Property | XeF₄ | PCl₅ | SO₂ | |----------|------|------|-----| | LP | 2 | 0 | 1 | | Lewis Structure | Xe with 4 F bonds + 2 LP | P with 5 Cl bonds | S with 2 O double bonds + 1…
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5. write lewis structures for the following molecules or ions, which ha…
a) PF₃ (obeys octet, for reference: P with 3 F bonds + 1 lone pair) b) XeF₆ (Xe: 6 F bonds + 1 lone pair, expanded octet) c) BH₃ (B: 3 H bonds, incomplete octet) d) ClF₅ (Cl: 5 F …
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consider the following thermochemical reaction: 2so₂(g) + o₂(g) → 2so₃(…
exothermic
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2s(s) + 2o₂(g) ⇌ 2so₂(g) k₁ = 2×10¹⁰⁵ 2so₂(g) + o₂(g) ⇌ 2so₃(g) k₂ = 7×…
A. \(1\times 10^{130}\)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \(2F_{2}(g)+O_{2}(g)\to2OF_{2}(g)\)
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the ph scale for acidity is defined by ph = - log₁₀h⁺ where h⁺ is the c…
$10^{-7}$ (or 0.0000001) ### Part (B)
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2. what are the three states of matter? a solid b wet c liquid d gas e …
A. Solid, C. Liquid, D. Gas
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a particle with a positive or negative net charge is called an ion. sel…
The first and third models are ions.
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part a we just saw that the anion clo₃⁻ is named chlorate. what is the …
A. iodate
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part a cao is named calcium oxide and not calcium(ii) oxide. why? ○ bec…
Because calcium is among those metals that forms an ion with the same charge in all of its compounds.
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what is the basic form for the names of ionic compounds containing a me…
[Cation Name][Anion Base Name + -ide] (the fourth option in the list, with the text "[Cation Name][Anion Base Name + -ide]")
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part a the compound ncl₃ is named nitrogen trichloride, while alcl₃ is …
The name forms differ because \( \text{NCl}_3 \) is a molecular compound and \( \text{AlCl}_3 \) is an ionic compound. Prefixes such as mono, di, and tri are used for molecular co…
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which of the following is a molecular compound that produces h⁺ ions wh…
\( \boldsymbol{H_2SO_4} \) (the option corresponding to \( H_2SO_4 \))
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part h name the acid: hcl(aq) spell out the full name of the acid.
hydrochloric acid
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part g provide the name of the oxyanion of the acid: h₃po₄(aq) spell ou…
phosphate
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part f name the acid: h₃po₄(aq). spell out the full name of the acid.
phosphoric acid
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part e provide the name of the oxyanion of the acid: hc₂h₃o₂(aq) spell …
acetate ion
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name the acid: hc₂h₃o₂(aq) spell out the full name of the acid.
acetic acid
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part c provide the name of the oxyanion of the acid: h₂co₃(aq). spell o…
carbonate ion
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name the acid: h₂co₃(aq). spell out the full name of the acid.
carbonic acid
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part a classify each acid a binary acid or an oxyacid. drag the appropr…
Binary acid: \( \text{HCl(aq)} \) Oxyacid: \( \text{H}_3\text{PO}_4(\text{aq}) \), \( \text{H}_2\text{CO}_3(\text{aq}) \), \( \text{HC}_2\text{H}_3\text{O}_2(\text{aq}) \)