化学
化学反応、化学量論、分子構造、元素の性質。
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part 1: elements and symbols each element has a one- or two-letter symb…
s A. 1. $H$; 2. $O$; 3. $Na$; 4. $Cl$; 5. $Ca$ B. 6. Potassium; 7. Magnesium; 8. Nitrogen; 9. Aluminum
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term definition 2. compound b. a substance made of only one type of ato…
3. Chemical Formula —— C. A shorthand way to show which elements are in a substance ### 4. Nomenclature - Definition Matching
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key vocabulary match each term with its correct definition. term defini…
The definition "A substance made of two or more different elements chemically combined" (option A) does not match the term "Element". This definition actually describes a "Compoun…
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atb february 6, 2026 the correct order for intermolecular forces from s…
C. hydrogen bonding > dipole - dipole forces > London dispersion
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5. how many grams of lithium nitrate, lino₃, will be needed to make 250…
$\approx 314\ \text{grams}$ (rounded to 3 significant figures) --- ### Problem 6
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2. how many grams of carbon dioxide form, how many grams of iron would …
Problem 3: $864.8\ \text{g}$ Problem 4: $11.94\ \text{L}$
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10. how many moles of oxygen are needed to react with 5 moles of alumin…
5.625 moles of oxygen
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what kind of bond will have a prefix? (eg. mono, di, tri...) * ionic co…
B. Covalent ### Second Question:
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what is the name of this compound? pcl₃ * monophosphorus trichloride ph…
C. Phosphorus Trichloride ### Second Sub - Question: Formula of Dihydrogen Monoxide
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9. hcl reacts with mg to produce mgcl₂ and h₂ gas. if i have 56.2g of h…
1. Moles of $\ce{MgCl2}$ produced: $0.771\ \text{mol}$ 2. Moles of $\ce{O2}$ needed: $5.625\ \text{mol}$
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7. $c_2h_6$ combusts with $o_2$ to produce $h_2o$ and $co_2$. if i have…
$\approx 107.3\ \text{L}$ --- ### For Question 8:
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chicago by carl sandburg 1 hog butcher for the world, 2 tool maker, sta…
- Sandburg captures the essence of city life through the diverse images of Chicago's residents. - The poem challenges rules about point of view, rhyme scheme, and meter.
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6. read this sentence: \in the case of, say, a basketball, as scientist…
C. qualities or characteristics ### Question 7
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1. what two categorical ways of thinking about matter are discussed in …
C. physical and chemical ### Question 2
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select the correct answer. the ph scale measures the acidity of a liqui…
B. 0.001
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( \ce{2 F2(g) + O2(g) → 2 OF2(g)} \)
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the $e_{\\text{cell}}^{\\circ}$ value for the cell is -0.55 v. calculat…
+106 (or more precisely +106.13 or +106.15, but typically rounded to a reasonable number of significant figures. The given $E^\circ_{cell}$ has two significant figures? Wait, $E^\…
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calculate the $\\mathrm{e^\\circ_{cell}}$ for the cell given below. $\\…
\(-0.55\)
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calculate the gibbs free energy for the cell. the cell has a potential …
-376 (or -376.3, depending on rounding; the exact calculation gives -376291.5 J = -376.2915 kJ, so approximately -376 kJ)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $\boldsymbol{2F_2(g) + O_2(g) ightarrow 2OF_2(g)}$
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calculate the e⁰_cell value for the cell. 2fe³⁺ + mn → mn²⁺ + 2fe²⁺ hal…
\(+1.95\)
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a current of 5.25 a is applied to the aluminum sulfate solution for 112…
\boxed{3.29} (or more accurately, let's recalculate: Wait, maybe I made a mistake in the number of electrons. Wait, Al³+ gains 3 electrons, so 3 moles of e⁻ per 1 mole of Al. So t…
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aluminum plating is sometimes used to reduce corrosion in materials exp…
3
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how many minutes will it take to plate the spoon with 0.25 g silver? $\…
\boxed{0.93} (minutes, approximately)
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how many minutes will it take to plate the spoon with 10.3 g cr? cr³⁺ +…
\( \approx 103 \) (or more precisely, around 102.8) minutes.
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what is the ecell for the electrolysis of molten mni₂(l)? half-reaction…
-1.72 V (corresponding to the option: -1.72 V)
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what is the balanced net ionic equation for the electrolysis of molten …
A. \(MnI_2(l) ightarrow Mn(s)+I_2(s)\)
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knowing that h₂ is produced during reduction and o₂ is produced during …
\(-2.06\ V\) (corresponding to the option - 2.06 V)
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knowing that h₂ is produced during reduction and o₂ is produced during …
\(4H_2O ightarrow 4OH^-+2H_2+O_2 + 4H^+\) (the option with this equation)
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what occurs during oxidation in the reaction for the electrolysis of 1.…
Oxygen gas is produced.
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what occurs during reduction in the reaction for the electrolysis of 1.…
D. Hydrogen gas is produced.
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what product forms at the anode when molten nibr₂ goes through electrol…
\(Br_2\) (the option: \(Br_2\))
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what reaction takes place at the cathode when molten nibr₂ goes through…
D. \( \ce{Ni^{2+} + 2e^- \to Ni} \)
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what product forms at the cathode when cucl₂ goes through electrolysis?…
D. Cu (assuming the options are labeled as A. $\ce{Cu^{2+}}$, B. $\ce{Cl^{-}}$, C. $\ce{Cl_{2}}$, D. $\ce{Cu}$)
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what reaction takes place at the anode when cucl₂ goes through electrol…
B. $2\ce{Cl^{-}} ightarrow\ce{Cl_{2}} + 2\ce{e^{-}}$
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calculate the electrochemical cell potential. $2\\text{al} + 3\\text{sn…
1.52 V
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complete the text with the correct pair of words. could you ____ these …
take... a part
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half-reaction | e° (v) a⁺ + e⁻→ a | -0.5 b⁺ + e⁻ → b | 0.0 c⁺ + e⁻→ c |…
1.5 V
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half-reaction | e° (v) a⁺ + e⁻→ a | -0.5 b⁺ + e⁻ → b | 0.0 c⁺ + e⁻→ c |…
Substance B
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half-reaction | e° (v) a⁺ + e⁻ → a | -0.5 b⁺ + e⁻ → b | 0.0 c⁺ + e⁻ → c…
Substance A
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2al + 3sn²⁺ → 2al³⁺ + 3sn in the voltaic cell above, which letter repre…
C
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2al + 3sn²⁺ → 2al³⁺ + 3sn in the voltaic cell above, which letter repre…
A
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2al + 3sn²⁺ → 2al³⁺ + 3sn which of these represents the line notation o…
A
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what is the balanced chemical reaction for the cell with a potential of…
B
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al is oxidized in a spontaneous cell made from tin and aluminum. the ov…
\( -1.66 \)
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2cu⁺ + ni → 2cu + ni²⁺ in the voltaic cell above, which answer choice l…
C. \(KNO_3\) (the part labeled C in the diagram)
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2cu⁺ + ni → 2cu + ni²⁺ which answer choice letter represents the cathod…
A. \(Cu / Cu^{+}\) (the half - cell in beaker A)
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which of these represents the line notation of the spontaneous cell? 2c…
C
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which of these is the chemical reaction for the spontaneous cell? stand…
B. \( 2\text{Cu}^+ + \text{Ni} ightarrow 2\text{Cu}+\text{Ni}^{2+} \)
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3cu²⁺ + 2cr → 2cr³⁺ + 3cu in the voltaic cell above, which letter repre…
D
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3cu²⁺ + 2cr → 2cr³⁺ + 3cu in the voltaic cell above, which letter repre…
A
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3cu²⁺ + 2cr → 2cr³⁺ + 3cu which of these represents the line notation o…
C
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what is the balanced chemical reaction for the cell with a potential of…
A
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a spontaneous cell made from copper and chromium has an ( e_{\text{cell…
\(-0.73\)
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what type of electrochemical cell is described in this example? mg / mg…
A. Galvanic Cell
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a piece of zn metal is added to an agno₃ solution, resulting in the pla…
The reaction is a single replacement reaction.
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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.
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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…
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the redox reaction given below occurs in a basic solution. ( ce{hpo^{2-…
The number of electrons transferred in the \( \ce{N2H4} \) half - reaction (oxidation half - reaction) is \( 4 \). The balanced half - reaction is \( \ce{N2H4 + 4OH^- -> N2 + 4H2O…
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psychological science uses research to study the mind, brain, and behav…
- mind: thought, memory - brain: neurochemical processes, hormonal activity - behavior: cooperation, mating
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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…
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dichromate is reduced to the chromium(iii) ion in basic solution. the u…
14
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given the skeleton half-reaction, identify whether this represents a re…
1. reduction
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identify the oxidation number of chromium in the dichromate ion. ? cr₂o…
1
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is the reaction thermodynamically favorable or unfavorable? 1. favorabl…
1
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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 …
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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)
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calculate the e°cell value for the cell given below. mn | mn²⁺ || fe³⁺,…
\( +1.95 \)
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how many minutes will it take to plate the spoon with 0.25 g silver? $\…
\boxed{0.93} (Wait, no, wait, let's check again. Wait, 0.25 g Ag: moles = 0.25 / 107.87 ≈ 0.002317 mol. Q = 0.002317 mol * 96485 C/mol ≈ 223.6 C. t = 223.6 / 4 = 55.9 s ≈ 0.93 min…
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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)
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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.
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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)
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what is the $\\text{e}^\\circ_{\\text{cell}}$, knowing the copper is re…
- 0.89 V
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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")
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what occurs during reduction in the reaction for the electrolysis of aq…
Copper(II) ions change to copper.
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what is the e_cell for the electrolysis of molten lif? half-reaction | …
-5.92 V
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what is the balanced net ionic equation for the electrolysis of molten …
A. \( 2\text{LiF}(l) ightarrow 2\text{Li}(s) + \text{F}_2(g) \)
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what product forms at the anode when molten nibr₂ goes through electrol…
$\ce{Br_2}$ (the option corresponding to $\ce{Br_2}$)
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what reaction takes place at the cathode when molten nibr₂ goes through…
B. \( \text{Ni}^{2+}+2\text{e}^- ightarrow\text{Ni}\)
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what is the half-reaction occurring at the anode in this cell? cr³⁺→cr⁶…
D. \( \text{Cr} ightarrow \text{Cr}^{3+}+3\text{e}^- \)
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an electrolytic reaction occurs in which chromium is plated onto an obj…
the spoon
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half - reaction | e° (v) au³⁺ + 3e⁻ → au | + 1.42 ti²⁺ + 2e⁻ → ti | - 1…
\( \text{Au}^{3+}+\text{Ti} \) (the option corresponding to \( \text{Au}^{3+}+\text{Ti} \))
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half-reaction | e° (v) au³⁺ + 3e⁻ → au | + 1.42 ti²⁺ + 2e⁻ → ti | -1.63…
A. \(Ti^{2+}>Sn^{2+}>Cu^{2+}>Au^{3+}\)
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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…
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half-reaction | e° (v) a⁺ + e⁻→ a | -0.5 b⁺ + e⁻ → b | 0.0 c⁺ + e⁻→ c |…
+0.5 V
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half-reaction | e° (v) a⁺ + e⁻→ a | -0.5 b⁺ + e⁻ → b | 0.0 c⁺ + e⁻→ c |…
A. Substance B
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half-reaction | e° (v) a⁺ + e⁻→ a | -0.5 b⁺ + e⁻ → b | 0.0 c⁺ + e⁻→ c |…
Substance C
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2al + 3sn²⁺ → 2al³⁺ + 3sn in the voltaic cell above, which letter repre…
C
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2al + 3sn²⁺ → 2al³⁺ + 3sn in the voltaic cell above, which letter repre…
A
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2al + 3sn²⁺ → 2al³⁺ + 3sn which of these represents the line notation o…
A
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what is the balanced chemical reaction for the cell with a potential of…
B. \(2\text{Al}+3\text{Sn}^{2+} ightarrow2\text{Al}^{3+}+3\text{Sn}\)
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al is oxidized in a spontaneous cell made from tin and aluminum. the ov…
-1.66
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a species contains 72 protons, 178 neutrons and 74 electrons. what is t…
\(-2\) ### Question 8 (Electrons in the species \( \ce{^{154}_{103}X^{-1}} \))
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if a nacl salt bridge connected this half - cell to complete a voltaic …
B. $\ce{Cl^-}$
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what is the half - reaction occurring in this anode half - cell? initia…
C. \( \text{Cu} ightarrow \text{Cu}^{2+} + 2\text{e}^{-} \)
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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.
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how do the electrons flow within a voltaic cell? the electrons flow fro…
A. from the anode to the cathode across the voltmeter.
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where does oxidation occur for a galvanic or voltaic cell? oxidation oc…
A. Oxidation occurs at the anode.
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where does reduction occur for a galvanic or voltaic cell? reduction oc…
A. Reduction occurs at the cathode.
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a piece of zn metal is added to an agno₃ solution, resulting in the pla…
The reaction is a single replacement reaction.