Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
-
what reaction takes place at the anode when cucl₂ goes through electrol…
B. $2\ce{Cl^{-}} ightarrow\ce{Cl_{2}} + 2\ce{e^{-}}$
-
calculate the electrochemical cell potential. $2\\text{al} + 3\\text{sn…
1.52 V
-
complete the text with the correct pair of words. could you ____ these …
take... a part
-
half-reaction | e° (v) a⁺ + e⁻→ a | -0.5 b⁺ + e⁻ → b | 0.0 c⁺ + e⁻→ c |…
+0.5 V
-
half-reaction | e° (v) a⁺ + e⁻→ a | -0.5 b⁺ + e⁻ → b | 0.0 c⁺ + e⁻→ c |…
A. Substance B
-
half-reaction | e° (v) a⁺ + e⁻ → a | -0.5 b⁺ + e⁻ → b | 0.0 c⁺ + e⁻ → c…
Substance A
-
2al + 3sn²⁺ → 2al³⁺ + 3sn in the voltaic cell above, which letter repre…
A
-
2al + 3sn²⁺ → 2al³⁺ + 3sn which of these represents the line notation o…
A
-
what is the balanced chemical reaction for the cell with a potential of…
B. \(2\text{Al}+3\text{Sn}^{2+} ightarrow2\text{Al}^{3+}+3\text{Sn}\)
-
al is oxidized in a spontaneous cell made from tin and aluminum. the ov…
-1.66
-
2cu⁺ + ni → 2cu + ni²⁺ in the voltaic cell above, which answer choice l…
C. \(KNO_3\) (the part labeled C in the diagram)
-
2cu⁺ + ni → 2cu + ni²⁺ which answer choice letter represents the cathod…
A. \(Cu / Cu^{+}\) (the half - cell in beaker A)
-
which of these represents the line notation of the spontaneous cell? 2c…
C
-
which of these is the chemical reaction for the spontaneous cell? stand…
B. \( 2\text{Cu}^+ + \text{Ni} ightarrow 2\text{Cu}+\text{Ni}^{2+} \)
-
3cu²⁺ + 2cr → 2cr³⁺ + 3cu in the voltaic cell above, which letter repre…
A
-
3cu²⁺ + 2cr → 2cr³⁺ + 3cu which of these represents the line notation o…
C
-
what is the balanced chemical reaction for the cell with a potential of…
A
-
a spontaneous cell made from copper and chromium has an ( e_{\text{cell…
\(-0.73\)
-
what type of electrochemical cell is described in this example? mg / mg…
A. Galvanic Cell
-
a piece of zn metal is added to an agno₃ solution, resulting in the pla…
The reaction is a single replacement reaction.
-
the two half - reactions are given below. $2e^- + 2h_2o + hpo_3^{2-} \ …
The coefficient of \(OH^-\) (hydroxide ion) in the balanced net ionic equation is 2.
-
the redox reaction given below occurs in a basic solution. ( ce{hpo^{2-…
The number of electrons transferred in the \( \ce{N2H4} \) half - reaction (oxidation half - reaction) is \( 4 \). The balanced half - reaction is \( \ce{N2H4 + 4OH^- -> N2 + 4H2O…
-
a sample of an unknown pure substance x is analyzed and found to contai…
# Explanation: To determine if a substance is a pure substance (compound) containing only \( E_1 \) and \( E_2 \), we use the law of definite proportions. For a pure substance, th…
-
psychological science uses research to study the mind, brain, and behav…
- mind: thought, memory - brain: neurochemical processes, hormonal activity - behavior: cooperation, mating
-
chapter 1: the science of psych 1.2 what are the latest developments in…
# Brief Explanations: These strategies are evidence-based active learning techniques that promote deeper understanding, which is critical for mastering complex organic chemistry c…
-
dichromate is reduced to the chromium(iii) ion in basic solution. the u…
14
-
given the skeleton half-reaction, identify whether this represents a re…
1. reduction
-
identify the oxidation number of chromium in the dichromate ion. ? cr₂o…
1
-
is the reaction thermodynamically favorable or unfavorable? 1. favorabl…
1
-
calculate the gibbs free energy for the following cell. half-reaction |…
- 52 (or more precisely - 52.1, but - 52 is a reasonable answer considering significant figures. The half - reaction potentials have two decimal places, and the calculation gives …
-
calculate the gibbs free energy for the following cell. mn | mn²⁺ || fe…
-376 (or -376.3, depending on rounding; the precise calculation gives approximately -376 kJ)
-
calculate the e°cell value for the cell given below. mn | mn²⁺ || fe³⁺,…
\( +1.95 \)
-
how many seconds will it take to reduce 1.0 × 10³ g al from an aqueous …
\boxed{1.07\times10^{5}} (or \boxed{107000} depending on significant figures, but more accurately, using the calculation above, it's approximately 1.07×10⁵ seconds)
-
solid al is reduced from al(no₃)₃ solution. how many moles of electrons…
For the reduction of 1 mole of Al from \( \text{Al(NO}_3\text{)}_3 \) solution, 3 moles of electrons are transferred.
-
how many minutes will it take to plate the spoon with 10.3 g cr? cr³⁺ +…
103 (rounded to a reasonable number of significant figures)
-
what is the $\\text{e}^\\circ_{\\text{cell}}$, knowing the copper is re…
- 0.89 V
-
what is the balanced net ionic equation, knowing the copper is reduced …
$\boldsymbol{2\ce{Cu^{2+}} + 2\ce{H_{2}O}\to \ce{O_{2}} + 4\ce{H^{+}} + 2\ce{Cu}}$ (corresponding to the option "2Cu²⁺ + 2H₂O → O₂ + 4H⁺ + 2Cu")
-
what occurs during reduction in the reaction for the electrolysis of aq…
Copper(II) ions change to copper.
-
what is the e_cell for the electrolysis of molten lif? half-reaction | …
-5.92 V
-
what is the balanced net ionic equation for the electrolysis of molten …
A. \( 2\text{LiF}(l) ightarrow 2\text{Li}(s) + \text{F}_2(g) \)
-
what product forms at the anode when molten nibr₂ goes through electrol…
$\ce{Br_2}$ (the option corresponding to $\ce{Br_2}$)
-
what reaction takes place at the cathode when molten nibr₂ goes through…
B. \( \text{Ni}^{2+}+2\text{e}^- ightarrow\text{Ni}\)
-
what is the half-reaction occurring at the anode in this cell? cr³⁺→cr⁶…
D. \( \text{Cr} ightarrow \text{Cr}^{3+}+3\text{e}^- \)
-
an electrolytic reaction occurs in which chromium is plated onto an obj…
the spoon
-
half - reaction | e° (v) au³⁺ + 3e⁻ → au | + 1.42 ti²⁺ + 2e⁻ → ti | - 1…
\( \text{Au}^{3+}+\text{Ti} \) (the option corresponding to \( \text{Au}^{3+}+\text{Ti} \))
-
half-reaction | e° (v) au³⁺ + 3e⁻ → au | + 1.42 ti²⁺ + 2e⁻ → ti | -1.63…
A. \(Ti^{2+}>Sn^{2+}>Cu^{2+}>Au^{3+}\)
-
read each description in the first column of the table below. if any ch…
Does any element with \( Z \leq 92 \) match the description? Yes If you checked yes, give the symbol of an element with \( Z \leq 92 \) that matches: Kr ### 2. A metalloid in Grou…
-
half-reaction | e° (v) a⁺ + e⁻→ a | -0.5 b⁺ + e⁻ → b | 0.0 c⁺ + e⁻→ c |…
Substance C
-
2al + 3sn²⁺ → 2al³⁺ + 3sn in the voltaic cell above, which letter repre…
C
-
2al + 3sn²⁺ → 2al³⁺ + 3sn in the voltaic cell above, which letter repre…
A
-
a species contains 72 protons, 178 neutrons and 74 electrons. what is t…
\(-2\) ### Question 8 (Electrons in the species \( \ce{^{154}_{103}X^{-1}} \))
-
if a nacl salt bridge connected this half - cell to complete a voltaic …
B. $\ce{Cl^-}$
-
what is the half - reaction occurring in this anode half - cell? initia…
C. \( \text{Cu} ightarrow \text{Cu}^{2+} + 2\text{e}^{-} \)
-
based on the original image, which particle model shows the behavior of…
B. The particle model with 6 brown spheres (solid Cu) and more \( \text{Cu}^{2+} \) ions in the solution.
-
how do the electrons flow within a voltaic cell? the electrons flow fro…
A. from the anode to the cathode across the voltmeter.
-
where does oxidation occur for a galvanic or voltaic cell? oxidation oc…
A. Oxidation occurs at the anode.
-
where does reduction occur for a galvanic or voltaic cell? reduction oc…
A. Reduction occurs at the cathode.
-
what type of electrochemical cell is described in this example? mg / mg…
A. Galvanic Cell
-
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…
-
the two half-reactions are given below. $2e^- + 2h_2o + hpo_3^{2-} \ ig…
2
-
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.
-
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.
-
the two half - reactions are given below. $ce{ag^{+}(aq) + e^{-} -> ag(…
2
-
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.
-
suppose a student accidentally used naoh, instead of nacl for the salt …
A precipitate would form in the anode half - cell.
-
calculate the $\\ce{e^{\\circ}_{cell}}$ value for this voltaic cell. st…
\( 1.93 \)
-
which metal electrode will gain mass during the reaction in the spontan…
Fe half - cell
-
which half - cell will the sodium ions travel into for the spontaneous …
Fe half - cell
-
free response practice - electrochemistry a cell made from magnesium an…
left to right across the voltmeter
-
free response practice - electrochemistry water heaters normally contai…
magnesium (Mg)
-
the electrolysis of aqueous potassium iodide stoichiometry the mass of …
0.349 L
-
the electrolysis of aqueous potassium iodide faraday calculation an ele…
3.95 g
-
the electrolysis of aqueous potassium iodide free energy the free energ…
+$\Delta G$ because the cell requires energy to proceed.
-
the electrolysis of aqueous potassium iodide cell potential electrolyti…
Anything greater than 1.17 V
-
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)
-
the electrolysis of aqueous potassium iodide anode a power supply is co…
Iodine
-
the electrolysis of aqueous potassium iodide identifying electrodes a p…
The cathode
-
the electrolysis of aqueous potassium iodide splint testing a power sup…
Hydrogen gas
-
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.
-
5. what is the empirical formula for a compound that is 67.6% mercury, …
$\text{HgSO}_4$
-
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. $\text{HgSO}_4$
-
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 $\text{Ca(HCO}_3\text{)}_2$) ---
-
1. what is the empirical formula for a compound that is 83.7 % carbon a…
$\text{C}_3\text{H}_7$
-
q. which container will have lower pressure?
The left container will have lower pressure.
-
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…
-
multiple choice question when the marginal benefit equals the marginal …
optimal level of output.
-
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…
-
for each organic compound in the table below, name the highlighted side…
propyl
-
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…
-
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…
-
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…
-
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…
-
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.
-
select the correct answer. which of the following is a chemical reactio…
C. digestion of food
-
select the number of electrons each atom must gain or lose to have a fu…
lose 2 electrons ### For Fluorine (F):
-
select the correct answer. iron reacts with atmospheric oxygen to form …
A. $4\text{Fe} + 3\text{O}_2 ightarrow 2\text{Fe}_2\text{O}_3$
-
stoichiometry practice use the following equation to answer # 1 - 9. \\…
Combustion reaction (specifically, hydrocarbon combustion) ### Question 2
-
— 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 $CO_2$: $C_3…
-
3、$\\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.
-
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: $\text{SO}_2$