Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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fill in the name and empirical formula of each ionic compound that coul…
s (Row-wise): 1. Empirical formula: $\boldsymbol{\ce{Fe_3(PO_4)_2}}$; Name: $\boldsymbol{\text{iron(II) phosphate}}$ 2. Empirical formula: $\boldsymbol{\ce{Fe(BrO_3)_3}}$; Name: $…
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chemistry act & wkst: lewis structures for molecules. lewis structure –…
1. $NCl_3$ (completed): central atom: N; shared pairs: 3; unshared pairs: 1 2. $CF_2Cl_2$: central atom: C; shared pairs: 4; unshared pairs: 0 Lewis structure: $\ce{Cl-C(Cl)(F)-F}…
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3) move the fasteners to form a covalent bond between hydrogen and fluo…
### HF Questions: a) Lewis Dot Structure: $\ce{H:}\!\!\!\!\underset{\Large\sdot\sdot}{\overset{\Large\sdot\sdot}{\ce{F}}}\!\!\!\!:$ b) Hydrogen cannot stably lose its only electro…
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compound #1 - elemental fluorine (f₂) 1) cut out 2 fluorine (f) atoms. …
### Compound #1 (F₂) a) Lewis Dot Structure: $\ce{:F-F:}$ (each F has 3 additional pairs of dots, so full structure is $\ce{: \underset{\cdot \cdot}{F} - \underset{\cdot \cdot}{F}…
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7. when discussing and analyzing a sonnet, what is the first step a rea…
Identify the rhyme scheme to determine the type of sonnet.
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6. what is the main difference between haiku and free verse poetry? the…
the structure
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which of the following happen during this change of state? select all t…
- The substance melts and becomes a liquid. - The particles in the substance move far apart.
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look at the models and the table below. they show different chemical bo…
- the combination of atoms - the combination of bonds - the arrangement of atoms
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what happens when you heat a liquid? the particles begin to slide past …
- The substance gains thermal energy. - The substance vaporizes and becomes a gas.
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step 2: balance carbon (c) atoms on both sides. leave hydrogen and oxyg…
Balanced equation: \( \boldsymbol{\ce{C2H4 + 3O2 -> 2CO2 + 2H2O}} \) Atom counts (left/right): C: 2/2, H: 4/4, O: 6/6
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11. you have conductivity meters in 1 m solutions of hno₃, hno₂, and hc…
The order of acid strength from strongest to weakest is \(\boldsymbol{\text{HNO}_3 > \text{HNO}_2 > \text{HC}_2\text{H}_3\text{O}_2}\)
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which statement is true? (1 point) ○ organic material will not decompos…
Composting speeds up the decomposition of organic material
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a flexible container holds 97.4 liters of hydrogen gas (h₂). after the …
$43.8$
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in the structure of 2,3,3 - trimethylpentane, identify the primary (p),…
- 5 terminal carbons: p - Central 4-bonded carbon: q - CH carbon (left middle): t - CH₂ carbon (right middle): s
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given six molecules, identify the molecules with polar bonds and the mo…
The molecules with polar bonds are: - $\ce{O=C=O}$ - $\ce{H2O}$ - $\ce{CCl4}$ - $\ce{CH3Cl}$
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13) what is the molarity of a solution which contains 58.5 g of sodium …
$2.00\ \text{mol/L}$ ---
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-make sure that the change of the compound equals zero. 1) $\\stackrel{…
1. $\text{Al}_2\text{O}_3$ 2. $\text{SrS}$ 3. $\text{LiCl}$ 4. $\text{CaSO}_4$ 5. $\text{K}_3\text{PO}_4$ 6. $\text{Al(NO}_3\text{)}_3$ 7. $\text{Mg(C}_2\text{H}_3\text{O}_2\text{…
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an element with mass 780 grams decays by 17.1% per minute. how much of …
16.6 grams
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loudon | parise seventh edition a unknown compound was found to have th…
- ether - alcohol
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for the first element, start with the element name. for the second elem…
B. phosphorus pentachloride
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molecular/covalent compounds naming rules - for the first element, star…
nitrogen dioxide
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why work requires force you know from experience that if work is to be …
Resistance ### 2.
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the element name. the -ide name. oms of each st element. multiple-choic…
mono-
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what is the correct meaning of the word cadence? the cadence of his poe…
rhythmic flow
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carbon and oxygen cycle sunlight co₂ in atmosphere organic carbon dead …
To solve the problem of filling in the blanks in the carbon and oxygen cycle diagram, we analyze each component: ### Step 1: Identify the process with sunlight The box with sunlig…
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question 1-45 the noble gases, helium, neon, argon, krypton, xenon, and…
have complete outermost energy levels.
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question 1-44 what is the smallest particle of an element that still ex…
C. an atom
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practice: mole-particle & particle-mole a cup of water contains 13.9 mo…
The number of water molecules in the cup is \(\boldsymbol{8.37\times 10^{24}}\) molecules of \(H_2O\)
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in a science lab, the teacher provided michael with a triple - beam bal…
Substances can be identified by their density.
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question 14 of 21 aldehvde ketone neither answer bank oh | ch₃chch₃ o |…
## Aldehyde: $\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}=\text{O}$ ## Ketone: $\text{CH}_3\text{CH}_2\text{C(=O)CH}_3$ ## Neither: $\text{CH}_3\text{CH(OH)CH}_3$, $\text{CH}_3\tex…
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which electron configuration shows the arrangement of electrons in an a…
\([Ar]4s^2 3d^{10} 4p^5\) (the second option in the provided choices)
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question 1-28 when cations and anions form ionic compounds, the final c…
neutral zero
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question 1-27 which particles make up most of the mass of an atom? ○ pr…
A. protons and neutrons
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question 1-24 the position of an element on the periodic table helps sc…
B. oxygen (O)
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question 1 classify each molecule as an aldehyde, ketone, or neither. a…
### Aldehyde: $\text{CH}_3\text{CHCH}_3\text{CHO}$ (or $\ce{CH3CH(CH3)CHO}$) ### Ketone: $\text{CH}_3\text{CH}_2\text{C(O)CH}_3$ (or $\ce{CH3CH2COCH3}$) ### Neither: $\text{CH}_3\…
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the acidity of a liquid solution (ph) depends on the concentration of h…
D. $10^{-5}$
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if a solid line represents a covalent bond and a dotted line represents…
$\text{H}_3\text{N}\cdots\cdots\text{H-O-H}$
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complete the chart for each element. element\t# valence electrons\t# of…
### For the chart (corrections and explanations): #### Sodium: - Valence electrons: 1 (correct, Group 1 element). - Electrons gained/lost: Loses 1 (to achieve octet, becomes \( \t…
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rank the shown compounds by boiling point. highest boiling point lowest…
Highest boiling point: pentane ($\text{H}_3\text{C-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_3$) Middle boiling point: isopentane ($\text{H}_3\text{C-CH}_2\text{-CH(CH}_3\text{)-CH}…
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interconnectedness: the lesson stated that \pollution in one area event…
Soil pollution can lead to water pollution when rain or irrigation water leaches contaminants (e.g., chemicals, heavy metals) from polluted soil into groundwater or surface water …
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arrange the compounds by boiling point. highest boiling point lowest bo…
Highest boiling point: hexane ($\text{H}_3\text{C-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_3$) pentane ($\text{H}_3\text{C-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_3$) L…
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question 1-8 which of the following is true for the element calcium (ca…
It will lose/donate 2 electrons to have a full outer shell.
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soil characteristics worksheet visit ck12.org for free online practice …
a. Organic part ### Question 2
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the water level of a graduated cylinder rises from 50 ml to 75 ml when …
4 g/mL (corresponding to the option "4 g/mL")
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(c.1e, 2b) two students need to determine the density of iron for part …
A. Sarah’s measurements are more precise but Felipe’s average is more accurate
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what is the best form of measurement to find the time it takes for a dr…
A. g (grams) ### Second Question (about measuring time for a dropped object to hit the ground)
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what is the best form of measurement to find the distance a car travels…
450 cm ### Second Sub - Question (What is the best form of measurement to find the mass of a chemical added to a beaker?):
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what is the atomic number for carbon?
6
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11/15 consider the compound zirconium(v) phosphate: the % zirconium is …
42%
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a solution consists of one or more __________ dissolved into a ________…
solute;solvent
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the law in science that states that a given compound must always consis…
Law of Definite Proportions
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determine the mass(g) needed to make 850.0 ml of a 0.0650 m solution of…
36.4
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42. what is the law of conservation of energy? 43. what happens to the …
Energy cannot be created or destroyed, only transformed, and total energy in an isolated system is constant. ### Question 43
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determine the concentration in molarity(m) of the following solution: 1…
0.36
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determine the concentration in molarity(m) of the following solution: 1…
0.360
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how many grams of silver(i)nitrite are needed to prepare 250 ml of a 0.…
4.81
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determine the % composition of iron in iron(iii) carbonate. ~report 2 s…
38%
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how many moles are needed to make 2.50 l of a 3.8 m potassium bromide s…
9.5
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when converting from milliliters of solution into liters of solution th…
3;left
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the most common unit of concentration used in science labs is called __…
Molarity (or moles per liter, denoted as $\text{mol/L}$ or $M$)
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6 multiple choice 5 points trees are a renewable natural resource. whic…
First question: Renewable energy sources produce fewer greenhouse gases than fossil fuels Second question: Automobile manufacturing
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module 0: intro. to chemistry and measurement - your height (66 inches)…
- The standards of measurement used in science are those of the **metric system**. - The **International System of Units** (abbreviated **SI** after the French name Le Système Int…
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module 0: intro. to chemistry and measurement - the variable that is me…
Module 0: Intro. to Chemistry and Measurement - The variable that is measured during the experiment is the **dependent** variable. ...THEN (this) WILL HAPPEN. - **Control** variab…
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is potassium a cation or an anion? anion cation
cation
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9/35 atoms that lose electrons become... remain neutral, no charge lose…
positively charged
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how many electrons should beryllium have around its lewis dot model?
2
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how many electrons should flourine have around its lewis dot model?
7
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how many electrons should beryllium have around its lewis dot model?
2
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figure 1: converting hydrogen to helium reactants(in): 4 protons produc…
D. Nuclear energy is converted into electromagnetic and thermal energy (assuming the last option is D, as per the description of the options where the correct one is about nuclear…
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which reaction is endothermic? \\(\\ce{hcl + naoh \ ightarrow nacl + h_…
$\boldsymbol{6CO_2 + 12H_2O + energy ightarrow C_6H_{12}O_6 + 6O_2 + 6H_2O}$
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c (s) + o₂ (g) → co₂ (g) δh₁ = -393.5kj 2co (g) + o₂ (g) → 2co₂ (g) δh₂…
Divide the third equation by two, and double the enthalpy. Then, add.
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which type of reaction is always spontaneous? an endothermic reaction t…
an exothermic reaction that has an increase in disorder
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energy in chemical reactions carbon reacts with oxygen to produce carbo…
-393.5 kJ
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question 7 what is the rhyme scheme of these lyrics? i got bodyguards, …
FREE VERSE
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an ice cube is dropped into a glass of milk at 20 °c. which statement e…
C. Because milk has higher KE than ice, KE is transferred from the milk to the molecules of ice.
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a copper rod that has a mass of 200.0 g has an initial temperature of 2…
0.385 J/(g·°C)
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according to hesss law, if a series of intermediate reactions are combi…
the sum of the enthalpy changes of the intermediate reactions.
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identify the types of energy that belongs in each blank in the energy c…
- A: Chemical Energy - B: Thermal (Heat) Energy - C: Mechanical Energy
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if a concentrated chemical is spilled on clothing, the person should __…
b. wash and change clothes immediately
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the best way to deal with problems associated with leftover chemicals i…
d. only mix enough for the job at hand
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do now 1/13 explain how both weathering and erosion led to the formatio…
Weathering and erosion worked together to form the Grand Canyon as follows: 1. **Weathering (breakdown in place):** Chemical weathering (rainwater acids dissolving rock layers) an…
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fill in the name and empirical formula of each ionic compound that coul…
The empirical formula for the compound formed from \( \text{Pb}^{4+} \) and \( \text{C}_2\text{H}_3\text{O}_2^- \) is \( \text{Pb}(\text{C}_2\text{H}_3\text{O}_2)_4 \), and its na…
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | |----------|------------|-------------------|------------------------| | $\ce{Cr^{2+}}$ | $\ce{CN^-}$ | $\ce{Cr(CN)2}$ | …
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | |--------|-------|-------------------|------------------| | \( \text{Na}^+ \) | \( \text{NO}_2^- \) | \( \text{NaNO}_2 \)…
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fill in the name and empirical formula of each ionic compound that coul…
| Cation | Anion | Empirical Formula | Name of Compound | |--------|-------|-------------------|------------------| | $\ce{Na+}$ | $\ce{NO2-}$ | $\ce{NaNO2}$ | Sodium Nitrite | | …
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | |--------|-------|-------------------|------------------| | $\ce{Na+}$ | $\ce{NO2-}$ | $\ce{NaNO2}$ | sodium nitrite | | …
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fill in the name and empirical formula of each ionic compound that coul…
| Cation | Anion | Empirical Formula | Name of Compound | |--------|-------|-------------------|------------------| | $\ce{Na+}$ | $\ce{NO2-}$ | $\ce{NaNO2}$ | Sodium Nitrite | | …
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decide whether each pair of elements in the table below will form an io…
To solve this, we analyze each pair: ### Pair 1: Rubidium (Rb) & Fluorine (F) - Rubidium is a metal (alkali metal, Group 1), Fluorine is a non - metal (halogen, Group 17). Metals …
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decide whether each pair of elements in the table below will form an io…
To solve this, we analyze each pair of elements: ### 1. Bromine (Br) and Oxygen (O) - Bromine is a non - metal, oxygen is a non - metal. Ionic compounds are formed between metals …
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fill in the name and empirical formula of each ionic compound that coul…
To determine the empirical formula and name of each ionic compound formed from \( \text{Mg}^{2+} \) (cation) and the given anions, we use the **crisscross method** (also called th…
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fill in the name and empirical formula of each ionic compound that coul…
The completed table is as shown above with empirical formulas \( \text{NaBr} \), \( \text{NaF} \), \( \text{NaCl} \), \( \text{NaI} \) and compound names Sodium Bromide, Sodium Fl…
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fill in the name and empirical formula of each ionic compound that coul…
To solve for the empirical formulas and names of the ionic compounds, we use the principle of charge balance (the total positive charge equals the total negative charge in an ioni…
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | |--------|-------|-------------------|------------------| | \( \text{Ca}^{2+} \) | \( \text{P}^{3-} \) | \( \text{Ca}_3\t…
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fill in the name and empirical formula of each ionic compound that coul…
To solve for the empirical formula and name of each ionic compound, we use the criss - cross method (where the charge of the cation becomes the subscript of the anion and vice - v…
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fill in the name and empirical formula of each ionic compound that coul…
To solve for the empirical formulas and names of the ionic compounds formed from $\ce{Ca^{2+}}$ and the given anions, we use the criss - cross method (where the magnitude of the c…
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10. which of the following is not a homogenous equilibrium? a. \\( 2o_3…
c. \( \ce{H_2SO_4(aq) + NaOH(aq) ightleftharpoons H_2O(l) + Na_2SO_4(aq)} \)
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10. which of the following is not a homogenous equilibrium? a. $2o_{3(g…
c. $\ce{H_{2}SO_{4(aq)} + NaOH_{(aq)} ightleftharpoons H_{2}O_{(l)} + Na_{2}SO_{4(aq)}}$
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8. for a chemical system involving a gas, which of the following sets o…
b. Pressure, temperature, and concentration
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7. which of the following factors may affect the value of k for an equi…
a. Reaction temperature
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6 which of the following is true when the equilibrium constant, k, is e…
c. The concentrations of the products and the concentrations of the reactants are approximately equal