Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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what type of electrochemical cell is described in this example? mg / mg…
A. Galvanic Cell
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which object? \tred \tclear \tblue \t(circle one) \t\tmeasurement mass …
The density of the liquid is approximately $\boldsymbol{0.994\ g/cm^3}$ (or more precisely, if we keep more decimal places during calculation, $\frac{7.75}{7.8}\approx0.99359\appr…
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the two half-reactions are given below. $2e^- + 2h_2o + hpo_3^{2-} \ ig…
2
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the redox reaction given below occurs in a basic solution. \\(\\ce{hpo^…
The number of electrons transferred in the \( \ce{N2H4} \) half - reaction (oxidation half - reaction) is 4.
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the redox reaction given below occurs in a basic solution. $\\ce{hpo^{2…
The number of electrons transferred in the $\ce{HPO_3^{2-}}$ half - reaction is 2.
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the two half - reactions are given below. $ce{ag^{+}(aq) + e^{-} -> ag(…
2
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consider the redox reaction below. ag⁺(aq) + zn(s) → zn²⁺(aq) + ag(s) b…
The balanced silver half - reaction is \(Ag^+(aq)+e^-\to Ag(s)\), and the number of electrons transferred is 1.
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consider the redox reaction below. ag⁺(aq) + zn(s) → zn²⁺(aq) + ag(s) b…
The number of electrons transferred in the zinc half - reaction is 2.
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suppose a student accidentally used naoh, instead of nacl for the salt …
A precipitate would form in the anode half - cell.
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calculate the $\\ce{e^{\\circ}_{cell}}$ value for this voltaic cell. st…
\( 1.93 \)
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which metal electrode will gain mass during the reaction in the spontan…
Fe half - cell
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which half - cell will the sodium ions travel into for the spontaneous …
Fe half - cell
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free response practice - electrochemistry a cell made from magnesium an…
left to right across the voltmeter
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free response practice - electrochemistry water heaters normally contai…
magnesium (Mg)
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the electrolysis of aqueous potassium iodide stoichiometry the mass of …
0.349 L
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the electrolysis of aqueous potassium iodide faraday calculation an ele…
3.95 g
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the electrolysis of aqueous potassium iodide free energy the free energ…
+$\Delta G$ because the cell requires energy to proceed.
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the electrolysis of aqueous potassium iodide cell potential electrolyti…
Anything greater than 1.17 V
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the electrolysis of aqueous potassium iodide net ionic equation we now …
\( 2I^-(aq) + 2H_2O(l) \to H_2(g) + 2OH^-(aq) + I_2(s) \) (the first option)
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the electrolysis of aqueous potassium iodide anode a power supply is co…
Iodine
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the electrolysis of aqueous potassium iodide identifying electrodes a p…
The cathode
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the electrolysis of aqueous potassium iodide splint testing a power sup…
Hydrogen gas
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manganese:calcium ratios in marine sediment cores by site and depth mar…
C. within the 8 - 6 meter interval, Site 1's Mn:Ca ratio rose from approximately 0.52 to 0.71, while Site 2's rose from approximately 0.31 to 0.35.
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5. what is the empirical formula for a compound that is 67.6% mercury, …
$\text{HgSO}_4$
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4. what is the empirical formula for a compound that is 50.8% zinc, 16.…
4. $\text{Zn}_3\text{P}_2\text{O}_8$ (or $\text{Zn}_3(\text{PO}_4)_2$) 5. $\text{HgSO}_4$
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2. what is the empirical formula for a compound that is 7.70 % carbon a…
$\text{CaH}_2\text{C}_2\text{O}_6$ (or $\text{Ca(HCO}_3\text{)}_2$) ---
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1. what is the empirical formula for a compound that is 83.7 % carbon a…
$\text{C}_3\text{H}_7$
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q. which container will have lower pressure?
The left container will have lower pressure.
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which of the following statements best explains how ralph feels about t…
A. The ocean makes him feel isolated from everything and everyone he knows. (Note: Wait, correction. After re - evaluating, the correct answer should be B. The ocean is so vast th…
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multiple choice question when the marginal benefit equals the marginal …
optimal level of output.
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2-5 temperature scales | | fahrenheit | celsius | kelvin | | freezing p…
To fill the table about temperature scales (Fahrenheit, Celsius, Kelvin), we use the known values for each scale: ### Step 1: Freezing Point of Water - Fahrenheit: \( 32^\circ \te…
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for each organic compound in the table below, name the highlighted side…
propyl
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9. what could a model of ch₄ look like?
A model of CH₄ (methane) is most commonly represented as a **tetrahedral structure**. The most common visual models include: 1. Ball-and-stick model: Central carbon atom bonded to…
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2.2 assignment: intermolecular forces worksheet 1. draw the intermolecu…
(Diagrams should be drawn as follows, with dashed lines for hydrogen bonds and correct molecular orientation: - **Water to Water**: Two \(H_2O\) molecules with \(H\)-to-\(O\) dash…
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summarize what you have learned about the oil industry in texas by comp…
### Describe the Age of Petroleum: The Age of Petroleum in Texas started with the discovery of **crude** oil (nicknamed *"Black Gold"*) at **Spindletop**, where a massive **gusher…
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select the number of electrons each atom must gain or lose to have a fu…
A calcium atom (Ca) will: $\boldsymbol{\text{lose 2 electrons}}$ (For other atoms, the dropdown options are incorrect, but based on the given choices, Ca’s answer is "lose 2 elect…
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select all the correct answers. a colorimeter is an instrument used for…
A. The first colorimeter is reliable but not valid. B. The second colorimeter is valid and reliable.
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select the correct answer. which of the following is a chemical reactio…
C. digestion of food
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select the number of electrons each atom must gain or lose to have a fu…
lose 2 electrons ### For Fluorine (F):
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select the correct answer. iron reacts with atmospheric oxygen to form …
A. $4\text{Fe} + 3\text{O}_2 ightarrow 2\text{Fe}_2\text{O}_3$
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stoichiometry practice use the following equation to answer # 1 - 9. \\…
Combustion reaction (specifically, hydrocarbon combustion) ### Question 2
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— c₃h₈ + — o₂ → — co₂ + — h₂o — na + — cl₂ → — nacl — h₂o + — co₂ → c₇h…
### First Equation: $\boldsymbol{C_3H_8 + O_2 ightarrow CO_2 + H_2O}$ # Explanation: ## Step1: Balance Carbon (C) On the left, $C_3H_8$ has 3 C. So, put 3 in front of $CO_2$: $C_3…
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3、$\\ce{h_{2}so_{4} + 2 naoh \ ightarrow 2 h_{2}o + na_{2}so_{4}}$ how …
Approximately $\boldsymbol{17.3}$ moles (or more precisely ~17.27 moles) of $NaOH$ are needed.
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drag each tile to the correct box. match the given symbol or molecular …
- element: $\text{K}$ - inorganic elemental molecule: $\text{Cl}_2$ - organic compound: $\text{C}_6\text{H}_6$ - inorganic compound: $\text{SO}_2$
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kinetic energy is a type of ○ mechanical energy ○ chemical energy ○ pos…
A. mechanical energy ### Question 2 (The Law of Conservation of Energy states that)
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select the correct answer. which compound is inorganic? a. $c_6h_{12}o_…
B. $\text{KH}_2\text{PO}_4$
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what three properties does a work of art contain? composition, form, an…
subject, composition, and content (the fourth option) ### Question 2:
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debbies chemistry textbook weighs 7/10 of a pound and her geometry text…
$\frac{1}{5}$ pounds
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name class date solubility curve classify the following solutions as to…
To solve this, we analyze each solution by comparing the amount of solute to the solubility (from the curve) at the given temperature. A solution is: - **Unsaturated**: Solute < S…
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name class date classify each of the following as soluble (aq) or insol…
** aq ### 2. $\boldsymbol{Ba(OH)_2}$ Hydroxides: $\text{Ba}^{2+}$ hydroxides are soluble (exception to most hydroxides being insoluble).
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decide which element probably forms a compound with oxygen that has a c…
- Most similar to beryllium: B. barium - Least similar to beryllium: D. phosphorus
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3 multiple choice 1 point methamphetamine can also be taken orally as a…
A. The time it takes methamphetamine to reach the systemic circulation is much shorter than if administered intravenously
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1 multiple choice 1 point when determining the bioavailability of a dru…
6. large; portal circulation; low ### Question 2 (Multiple Answer)
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how many protons and neutrons are in an atom of rh-103 number of proton…
Number of protons = 45 Number of neutrons = 58
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how many protons are in a neutral atom of radon (rn)? how many electron…
Number of protons = 86 Number of electrons = 86
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ethanol, fermentation, depressant, intoxication, alcohol abuse, metabol…
depressant ### Second blank:
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a chemist needs to know the mass of a sample of aniline to 2 significan…
\( 13 \)
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a chemistry student needs 20.0 g of methyl acetate for an experiment. b…
21.4
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complete the table below. round your answers to the nearest degree. tem…
For the freezing point of grain alcohol: $\boxed{159}$ K For the melting point of gallium metal: $\boxed{303}$ K For the melting point of iron: $\boxed{1811}$ K
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#3 - balance this chemical equation on your own ____ naclo₃ → ____ nacl…
$2\text{NaClO}_3 ightarrow 2\text{NaCl} + 3\text{O}_2$ (The coefficients are 2, 2, 3 respectively)
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#4 - balance this chemical equation on your own ____ kno₃ + ____ h₂co₃ …
$2\text{KNO}_3 + \text{H}_2\text{CO}_3 ightarrow \text{K}_2\text{CO}_3 + 2\text{HNO}_3$ (The coefficients are 2, 1, 1, 2 respectively)
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#2 balance this chemical equation on your own ___ rb + ___ o₂ → ___ rb₂o
$4\text{Rb} + 1\text{O}_2 ightarrow 2\text{Rb}_2\text{O}$ (The coefficients are 4, 1, 2 respectively)
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how is the rhythm similar in both poems? your answer submit never submi…
To determine rhythmic similarity between two poems, analyze elements like **meter** (e.g., iambic pentameter, trochaic beats), **rhyme scheme** (e.g., ABAB, free verse with rhythm…
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directions: use your periodic table to complete the worksheet. 1. what …
Ag ### Question 2
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question 1 5 pts joe is a chemical engineer whose plant discharges heav…
B. The issue is whether present emissions should be considered a "violation" of city regulations
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fill in the information missing from this table. nuclide | protons | ne…
# Explanation: ## Step1: Recall definitions - \( Z \) (atomic number) = number of protons. - \( A \) (mass number) = number of protons + number of neutrons. - Nuclide symbol: \( _…
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an endothermic reaction is where heat is ________. taken in (absorbed) …
A. taken in (absorbed)
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an exothermic reaction is where heat is _____. released taken in (absor…
released (the checkbox next to "released" should be selected)
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burning of a candle is an example of an ____ reaction. □ exothermic □ e…
A. exothermic
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question 3 3. multiple choice: which piece of evidence best illustrates…
D. "I tried to comfort her, but she barely spoke." (Paragraph 24)
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fill in the missing information: | symbol | atom or ion? check all that…
| symbol | atom or ion? (check all that apply) | number of protons | number of electrons | |--------|--------------------------------------|-------------------|-------------------…
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how many protons and neutrons are in an atom of kr-80? number of proton…
Number of protons = 36 Number of neutrons = 44
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write the chemical symbol for an element in period 3 and group 7a.
Cl
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which substances have the same number of carbon atoms? select all corre…
Las sustancias con el mismo número de átomos de carbono son $\boldsymbol{\ce{CH3CH2Br}}$ (o $\ce{C2H5Br}$) y $\boldsymbol{\ce{C2H6O}}$, ya que ambas tienen 2 átomos de carbono. Ad…
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what is the law of conservation of mass? mass is never created or destr…
El rectángulo cian: Mass is never created or destroyed
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how many atoms of aluminum are on each side of the following equation. …
4
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i. co(no₃)₂ ii. (nh₄)₂co₃ iii. (nh₄)₃po₄ iv. al(no₃)₃ v. nh₄no₃ which o…
formulas I, II, and V
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a class reads two claims about a candle burning in a sealed container: …
D. Claim X states a law (what happens); Claim Y provides a theoretical explanation (why it happens).
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? g → 28.00g + 21.97g what is the missing mass? 49.97 28.00 50 21.97
49.97
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multiply or divide the following measurements. be sure each answer you …
### First Calculation: \( 611.0 \, \text{m} \div 53.00 \, \text{s} \) # Explanation: ## Step1: Perform the division \( 611.0 \div 53.00 = \frac{611.0}{53.00} \approx 11.5283 \) ##…
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add or subtract the following measurements. be sure each answer you ent…
First: \( 14.50 \, \text{mL} \) Second: \( 16.1 \, \text{mL} \) Third: \( 0.7 \, \text{mL} \)
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a chemistry student needs 70.0 g of glycerol for an experiment. by cons…
$55.6$
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take the following quiz to check your understanding of functional group…
To solve this, we analyze each molecule's properties: ### 1. Glucose Glucose has multiple hydroxyl (-OH) groups, creating a polar structure due to electronegativity differences (O…
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complete the following lewis dots. atoms\tions lithium li\tcalcium ca·²…
### Corrected Atoms & Ions: 1. Cesium: $\cdot \text{Cs}$ 2. Strontium ion: $[\text{Sr}]^{2+}$ ### Corrected Compounds: 1. $\text{NaCl}$: $[\text{Na}]^+ [:\ddot{\text{Cl}}:]^-$ 2. …
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question 1 0.34 pts what is meant by the term strata when describing se…
Question 1: Strata are layers composed of the same type of sedimentary rock in a thickness that is typically measured in tens of meters or more. Question 2: A specific mineral typ…
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use the periodic table to select the element that best fits each of the…
chromium, calcium, osmium ### Sub - question 2: Which element below is least reactive?
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which of the following is not a condition required by the government to…
95% organic ingredients (option A), outdoor access for livestock (option B), and prohibition of conventional pesticides (option C). There is no requirement for crops to be harvest…
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the diagram below is a model of two solutions. each green ball represen…
Solution A
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8 fill in the blank 1 point 8. type your answer... n₂ + type your answe…
First blank: 2, Second blank: 5, Third blank: 2
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everything around us is made of matter—your clothes, the trees, even th…
2. C. in order to explain that air is made of atoms that take up space even though air is invisible 3. C. The atoms in gas move the fastest
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redox practice problems indicate the oxidation states of each of the el…
Na: +1, O: -2, H: +1 ### Problem 2: Oxidation State of HBr
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9. the product fe(scn)₃ produces a deep red color in solution. explain …
The amount of the limiting reactant (either $\ce{Fe^{3+}}$ or $\ce{SCN^{-}}$ in the reaction to form $\ce{Fe(SCN)_{3}}$) determines the maximum amount of $\ce{Fe(SCN)_{3}}$ that c…
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coal is a major part of the economy in virginia, and it has many everyd…
A. Chemical energy is released as thermal energy.
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dilution 1. how much concentrated 18m sulfuric acid is needed to prepar…
\( 83.3 \, mL \) ### Question 2
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2. nitrogen oxides: definition/description\thow is nh₃ made?\thow is ni…
To answer these questions, we'll address each compound (Nitrogen Oxides, Carbon Monoxide, Ozone) by researching their properties, production, and effects. Here's a breakdown: ### …
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across 4. particles of rock or naturally occuring materials 7. rocks be…
## Across: 4. Sediment 7. Weathering 8. Rock 9. Metamorphic rock 10. Texture 13. Geology 14. Lava 15. Composition ## Down: 1. Mineral 2. Sedimentary rock 3. Rock cycle 5. Stratifi…
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8. a student mixes 29.1 g of kscn with 16.2 g of fecl₃. a. identify the…
### Part a: Identify the limiting reactant First, we need to write the balanced chemical equation for the reaction between \( \text{KSCN} \) and \( \text{FeCl}_3 \). The reaction …
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select the word that means large. farmers can use science to improve th…
substantial
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across 3. a substance that dissolves another substance. 5. material tha…
Down 1: Condensation
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redox mixed practice ws l directions: answer the following questions, u…
- \( \text{Li} \): \( +1 \) - \( \text{S} \): \( +6 \) - \( \text{O} \): \( -2 \) ### Problem 2: Assign Oxidation Numbers to \( \text{NO}_3^- \)