化学
化学反应、化学计量、分子结构与元素性质。
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question 6 of 10 which of these best describes a flight that is approac…
D. More drag is created because the air molecules are not moving out of the way of the airplane.
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supersonic flight can cause molecules on the surface of an airplane to …
A. This causes a lot of heat that the airplane must be shielded from.
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question 2 of 10 as air molecules move over and under the wings of an a…
A. Lift
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6. use the isotope graph to find the isotopes described here. in each c…
a. Hydrogen - 2 (Deuterium) $\ce{^2_1H}$, Carbon - 12 $\ce{^12_6C}$, Oxygen - 16 $\ce{^16_8O}$ b. Hydrogen - 2 (Deuterium) $\ce{^2_1H}$, Helium - 4 $\ce{^4_2He}$ c. Carbon - 12 $\…
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9. a large value for thermal conductivity means that the element is a s…
9. Silver, Copper 10. a. Nitrogen b. Nihonium
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6. what is the symbol and atomic number of the element with the most pr…
6. Og, 118 7. Hg, Br 8. Gases: H₂, He, Ne, Ar etc.; Liquids: O₂, N₂ etc. 9. Ag, Cu
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1. what elements are a gas at a given temperature?helium, neon, argon, …
1. Helium, neon, argon, krypton, xenon, radon 2. Helium (He, atomic number 2), neon (Ne, atomic number 10), argon (Ar, atomic number 18), krypton (Kr, atomic number 36), xenon (Xe…
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in which of the three bonds shown, are the electrons shared loosely? me…
Metallic Bonds
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6. what is the symbol and atomic number of the element with the most pr…
6. Symbol: Og, Atomic number: 118 7. Mercury (Hg), Bromine (Br) 8. Gases: Hydrogen (H₂), Helium (He) etc.; Liquids: Depends on substances present (e.g., some cryogenic liquids) 9.…
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1. what elements are a gas at a given temperature? hydrogen, helium, ni…
2. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn). 3. Atomic number, atomic mass, symbol, element type, electron configuration. 4. Melting point, boiling…
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7 what types of elements are noble gases? nonmetals metals metalloids 8…
7. Nonmetals 8. Metals
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4 which of the following types of elements can be brittle solids? metal…
4. Nonmetals and metalloids 5. Metals only 6. Nonmetals only
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2 which family is the most reactive? noble gas transition metal alkali …
2. C. Alkali Metal 3. Noble Gas: Do not form ions easily Alkali Metal: + 1 ions Transition Metal: Variable - charged ions Alkaline Earth Metal: + 2 ions Halogen: - 1 ions
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1 match the elements to the correct name of the family. lithium chlorin…
Lithium - Alkali metals Chlorine - Halogens Argon - Noble gases Iron - Transition metals Magnesium - Alkaline - earth metals
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una muestra de un compuesto desconocido tiene una composición porcentua…
The compound could be ethanol (assuming the first - option was meant to be $CH_3CH_2OH$). The other options with "do" seem to be mis - written and not valid chemical formulas in t…
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una muestra de un compuesto desconocido tiene una composición porcentua…
The compound \(C_2H_6O\) (ethanol) could be the sample as its percentage composition of carbon (\(\approx52.17\%\)), hydrogen (\(\approx13.04\%\)) and oxygen (\(\approx34.78\%\)) …
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analysis: there will be 2 sections to your analysis listed below (calcu…
The molar mass of the gas can be calculated using $M = \frac{mRT}{PV}$. The percent error can be calculated using $\text{Percent Error}=\frac{\vert\text{Experimental Value}-\text{…
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purpose (lo): use water displacement and the pv=nrt equation to determi…
If we assume the correct mass data and calculations, the molar mass of butane ($C_4H_{10}$) is 58 g/mol. If we calculate based on the data in the table with some assumptions for t…
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relaciona cada escenario con la ley que lo explica un globo se encoge c…
| Scenario | Law | |--|--| | A balloon shrinks when taken outside in winter. | Charles's Law | | When the size of a chamber is increased, air - pressure decreases. | Boyle's Law |…
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make the following conversions a. 15.6 g =? μg b. 3.72 x 10⁴ g =? kg c.…
a. $1.56\times 10^{7}\text{ μg}$ b. 37.2 kg c. 72300 cm³ d. 0.37 kJ e. 4700 dg f. 81 μL g. $3.7\times 10^{14}$ pg h. $4.7\times 10^{9}$ μg i. 0.61 mL j. 25600 mg k. 0.0572 ML l. $…
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escriba la respuesta correcta en el cuadro. la solubilidad del carbonat…
790
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ley de los gases ideales pv=terapia de reemplazo de n- tratamiento (trn…
A. 0.026 moles
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ley de los gases ideales pv=terapia de reemplazo de n - tratamiento (tr…
B. 0.12 moles
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meet the man who invented cool whip, tang and pop rocks text font size …
C. William A. Mitchell was a creative food scientist who invented convenient foods from artificial ingredients.
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hoja informativa sobre las leyes de los gases ley de los gases ideales …
$3.56\times 10^{-4}$ mol
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hoja informativa sobre las leyes de los gases ley de los gases ideales …
D. 514 kPa
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hoja informativa sobre las leyes de los gases ley de los gases ideales …
B. 0.33 moles
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chem 1110 lab - naming and oxidation numbers bonus activity - worth up …
1. Nickel(II) bromide; \(Ni = + 2\) 2. Sulfurous acid; \(S = + 4\) 3. Lead(IV) chlorite; \(Cl = + 3\) 4. Dichlorine pentoxide; \(Cl = + 5\), \(O=-2\) 5. Uranium(VI) fluoride; \(U …
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hoja informativa sobre las leyes de los gases ley de los gases ideales …
$1470$
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an explosive start born to a minnesota farm family in 1911 mitchell was…
The main idea of "An Explosive Start" is that Mitchell faced many challenges in his early life including family loss, difficult work to earn money, and a serious laboratory accide…
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meet the man who invented cool whip, tang and pop rocks text laura l do…
The main idea of the given text is that William A. Mitchell, a research chemist, invented popular ready - made foods like Cool Whip, Tang, and Pop Rocks, which influenced generati…
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meet the man who invented cool whip, tang and pop rocks text laurie l d…
C. William A. Mitchell invented many easy to prepare foods during the middle of the twentieth century.
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multiple choice question because it is already stored in memory, ____ a…
D. schemas
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escriba la respuesta correcta en cada casilla ¿qué es la fórmula empíri…
1:3
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seleccione la respuesta correcta. a520 gramosuna muestra de agua de mar…
C. 3.6%
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5. in chemistry class, some students make solutions by mixing water (h₂…
Yes, Maurice is correct. The ratio of the amount of potassium iodide to water in each case is 0.04, indicating a proportional relationship with a constant of proportionality of 0.…
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question 14 (1 point) answer the following questions using the image be…
Volume: 10.0 mL Number of Sig Figs: 3 Lower Calibration Measurement: 0 mL Upper Calibration Measurement: 30 mL
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5. in chemistry class, some students make solutions by mixing water (h₂…
Yes, Maurice is correct.
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question 13 (4 points) answer the following questions using the image b…
Volume: 7.3 mL Number of Sig Figs: 2 Lower Calibration Measurement: 6 mL Upper Calibration Measurement: 9 mL
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question 12 answer the following questions using the image below. deter…
34.0 mL 3 20 mL 40 mL
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9 consider the molecular formula cocl₂. based on your knowledge of bond…
The chlorine atoms should be bound to the carbon atom.
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complete the following reactions using structural formulas, state the t…
Type: Free - radical substitution reaction $CH_3 - CH_2 - CH_3$: Propane Product $CH_3 - CHI - CH_3$: 2 - iodopropane
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1. how are elements and compounds different? a. elements are many diffe…
1. D. Elements are pure substances that cannot be broken down chemically but compounds are pure substances that can be broken down chemically. 2. D. Carbon (C) 3. C. Mixture 4. B.…
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3 multiple choice 1 point how does the speed of light in water compare …
The speed is slower in water than in air because the molecules are closer together.
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1. how are elements and compounds different? a. elements are many diffe…
1. D. Elements are pure substances that cannot be broken down chemically but compounds are pure substances that can be broken down chemically. 2. D. Carbon (C) 3. C. Mixture 4. B.…
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how are the following structures related? a. diastereomers b. enantiome…
A. Diastereomers
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the davis family grows organic vegetables to sell at a local farmers ma…
an increase in the cost of farm equipment a rise in demand for organic produce an increase in customers at the market
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for each pair below, decide whether the name and formula are correctly …
a. none b. $Li_3P$ c. $TiO_2$ d. $Na_2CO_3$ e. none f. none
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2 what is the charge on the cation in each compound below? a pdcl₂ b al…
a. + 2 b. + 3 c. + 2 d. + 4 e. + 3
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in may 2007, wildfires burned more than 350 square miles of habitat in …
The remaining organisms in the area become more territorial.
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a gas has a pressure of 749.9 mm hg at 12.5 °c. what is the temperature…
$-31.8$
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optional: makeup homework complete this homework to replace your lowest…
1. C. Solid 2. 57 L
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7 fill in the blank 1 point round 0.199 moles to 2 significant figures.…
0.20 moles The particles move faster. 289.8 mL
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3 multiple choice 1 point which of these is an compound? sodium hydroxi…
A. sodium hydroxide, NaOH ### Question 4
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(e) what oxidation number is assigned to nitrogen in the reactant nh₄cl…
The oxidation number of nitrogen in \(NH_4Cl\) is - 3. ### (f)
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part b how does the social context of the passage help the author devel…
D. The "semi - barbaric" state of the kingdom, where passion sometimes overrules ethics, helps readers understand that the princess might decide to sacrifice her lover.
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chm1110 laboratory limiting reactant there would be 0.502 grams of acet…
0.702 g
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if many trees are removed from a forest by logging, what is the most im…
decreased use of atmospheric CO₂
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review day question for unit one (atomic structure & properties) the ta…
(a) Element 1 is most metallic as it has the lowest first - ionization energy among the four elements in the third period. (b) Without specific ionization energy analysis details …
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1)quappelle - t - on carbone acimétrique. 2)citez les isoméries optique…
1) Un atome de carbone lié à quatre groupes différents. 2) Isoméries optiques : rotation de la lumière plane - polarisée due à carbone asymétrique. Isoméries géométriques : cis - …
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the drawing below shows a mixture of molecules. suppose the following c…
Limiting reactant: $C_2H_2$ Reactant with the least initial moles: $C_2H_2$ Reactant with the most initial moles: $O_2$
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question 9 are particles found in the nucleus of an atom with no charge…
Neutrons
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question 8 1 pts are particles found in the nucleus of an atom with a p…
Protons
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performing percent composition calculations carbon dioxide (co₂) is a g…
What is the percent by mass of carbon? 27.3% What is the percent by mass of oxygen? 72.7%
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which statement best describes the rhythm of \song of myself\? the poem…
The rhythm is very similar to the rhythm of everyday speech.
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for the reaction mathrm{kclo}_{3} longrightarrow mathrm{kcl}+\frac{3}{2…
K in KClO₃: + 1 K in KCl: + 1 Cl in KClO₃: + 5 Cl in KCl: - 1 O in KClO₃: - 2 O in O₂: 0 Which element is oxidized? O Which element is reduced? Cl
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part iii. intro to gasses r = 0.08206 l - atm / mol - k 1.00 atm = 14.7…
- 2.65 atm in bar: 2.6851125 bar - 2.65 atm in torr: 2014 torr - 2.65 atm in psi: 38.955 psi - 2.65 atm in kPa: 268.51125 kPa - 5a final volume: 10.12 L - 5b final volume: 12.32 L…
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question 5 use the equation above to help you calculate the heat of com…
- 1324 kJ/mol
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identify the unbalanced half - reaction in which a species is reduced. …
The unbalanced half - reaction in which a species is reduced: \(SO_4^{2 -}(aq)\to H_2S(g)\) Initial oxidation state of iodine: - 1 Final oxidation state of iodine: 0
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73. label the following ph scale with the correct numbers at the far en…
Label the left - hand end of the pH scale as 0 (acidic), the center as 7 (neutral), and the right - hand end as 14 (basic). Draw a line between 4.5 and 5.5 to represent the pH of …
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write the overall molecular equation for the reaction of hydroiodic aci…
$HI(aq)+KOH(aq) ightarrow KI(aq) + H_2O(l)$
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question 6 of 19 consider this aqueous reaction. hno₃(aq) + ba(oh)₂(aq)…
$Ba(NO_3)_2$
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the skeletal structure of (2e)-but-2-enamide (mm = 85.106 g/mol) is sho…
$7.7\times 10^{23}$
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if you only had the gumdrops that represent hydrogen atoms and oxygen a…
Moleculas como H₂O y H₂O₂ (si las hubiera en la lista no mostrada).
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for each compound in the table below, decide whether there would be any…
| Name | Hypochlorous acid | Acetic acid | Dimethyl ether | |--|--|--|--| | Between molecules of the compound? | Yes | Yes | No | | Between molecules of the compound and molecules…
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if you had only one water molecule, could you break it up and make some…
# Explicación breve: Una molécula de agua (H₂O) consta de dos átomos de hidrógeno y un átomo de oxígeno. Para formar otras moléculas sin átomos sobrantes, se necesitaría un número…
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identify the relationship between these two structures. a. diastereomer…
B. enantiomers
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what is the relationship between the following compounds? a. diastereom…
A. Diastereomers
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how are the following structures related? a. diastereomers b. enantiome…
A. Diastereomers
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question 1 of 9 what needs to happen in order for the ssms graphical ed…
the table must have a primary key
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a student investigated a sample of unknown gas. which statements repres…
The unknown gas is carbon dioxide.
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9. at standard temperature and pressure, krypton has a density of 0.003…
824.22 mL
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7. the density of platinum is 21.45 g/cm³. what is the mass of a sample…
$75.075\ g$
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the sugar, on the other hand, is dissolved, and its physical properties…
1. changed 2. heterogeneous mixtures 3. separated 4. filtration
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an atherosclerotic aneurysm is described as a _______ aneurysm. saccule…
1. B. fusiform 2. B. False
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an atherosclerotic aneurysm is described as a ______ aneurysm. fusiform…
1. A. fusiform 2. B. False
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oxyacids) question what is the name for the acid with the formula hclo₂…
B. Chlorous acid
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learning: molecular compounds - acids (binary & oxyacids) question what…
Phosphite acid
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learning: molecular compounds - acids (binary & oxyacids) question what…
B. Nitrous acid
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learning: molecular compounds - acids (binary & oxyacids) question what…
D. $HClO_4$
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question 1 what is the formula for acetic acid? answer hcooh ch₃cooh co…
B. $CH_3COOH$
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look at your gumdrop model of a water molecule. if you had several of t…
# Explicación: ## Paso 1: Identificar átomos en molécula de agua Una molécula de agua ($H_2O$) está formada por dos átomos de hidrógeno ($H$) y un átomo de oxígeno ($O$). ## Paso …
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question what is the name for the compound with the formula h₂co₃? answ…
B. Carbonic acid
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oxyacids question ① identify the acid formed from the hypochlorous anio…
C. HClO
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question 1 what is the name for the acid with the formula hno₃? answer …
Nitric acid
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learning: molecular compounds - acids (binary & oxyacids) question ① wh…
$CO_3^{2 - }$ (the second option among the given ones which should be $CO_3^{2 - }$ assuming there is a typo in the display where the superscript formatting might be off)
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place a t for true or an f for false on the blank for each of the follo…
15. T 16. T 17. F, Necesita perder 2 electrones para estabilizarse 18. F, electrones 19. T 20. T 21. T 22. F, comparten un par de electrones 23. F, pueden 24. T 25. T 26. F, débil…
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learning: molecular compounds - acids (binary & oxyacids) question what…
B. $HBr$
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if there are six h₂o molecules, then the notation is 6 h₂o. a. how many…
a. 12 b. 6 c. 12 átomos de hidrógeno y 6 átomos de oxígeno
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question what is the name for the acid with the formula hclo₂? answer c…
Chlorous acid