化学
化学反応、化学量論、分子構造、元素の性質。
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half-reaction | e° (v) e²⁺ + 2e⁻→ e | + 0.76 g⁺ + e⁻ → g | + 0.10 j²⁺ +…
Substance J
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half-reaction | e° (v) e²⁺ + 2e⁻→ e | + 0.76 g⁺ + e⁻ → g | + 0.10 j²⁺ +…
Substance L
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| half-reaction | e° (v) | | --- | --- | | au³⁺ + 3e⁻ → au | + 1.42 | |…
\( \text{Cu}^{2+}+\text{Sn} \) (the option with \( \text{Cu}^{2+}+\text{Sn} \))
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half-reaction | e° (v) au³⁺ + 3e⁻ → au | + 1.42 ti²⁺ + 2e⁻ → ti | -1.63…
D. $\ce{Au^3+ > Cu^2+ > Sn^2+ > Ti^2+}$ (assuming the last option is labeled D; if original labels differ, adjust, but the correct order is $\ce{Au^3+ > Cu^2+ > Sn^2+ > Ti^2+}$)
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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…
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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is this electrolytic cell thermodynamically favorable or thermodynamica…
B. The reaction is favorable because the Ecell value is positive.
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calculate the electrochemical cell potential. pb + cu²⁺ → pb²⁺ + cu hal…
0.47V
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which image correctly depicts the movement of ions out of a salt bridge…
B
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how will the electrons move in this voltaic cell? a. across the salt br…
B
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in a voltaic cell, what happens to the mass of the cathode as the react…
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 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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3cu²⁺ + 2cr → 2cr³⁺ + 3cu in the voltaic cell above, which letter repre…
D
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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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a salt bridge containing potassium nitrate connects an anode and cathod…
The \( \text{NO}_3^- \) ions flow into the anode compartment to neutralize the excess charge.
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a salt bridge containing potassium nitrate connects an anode and cathod…
The K⁺ ions flow towards the cathode compartment to neutralize the excess charge.
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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 cathode half - cell? init…
B. \( \text{Cu}^{2+} + 2\text{e}^{-} ightarrow \text{Cu} \)
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based on the original image, which particle model shows the behavior of…
A. Option A
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select the correct answer. who was a pro - us leader in iran? a. anwar …
D. Shah Mohammed Reza Pahlavi
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in a galvanic/voltaic cell, how do the electrons flow? the electrons tr…
The electrons go through the voltmeter from the black wire side to the red wire side.
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which statement about electrolytic cells is true? the reaction is spont…
The voltage value is negative.
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two different pieces of metal are placed into a lemon and connected to …
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 hydrated compound contains the moles of anhydrous solid and water s…
The coefficient for water in the hydrated formula is 6, so the formula is \( \text{FeCl}_3 \cdot 6\text{H}_2\text{O} \).
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iron and chlorine form several different compounds, some of which are h…
\(0.222\) (or more precisely \(\frac{2}{9} \approx 0.222\))
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iron and chlorine form several different compounds, some of which are h…
\(0.0370\) (or approximately \(0.037\))
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3.08 x 10-3 mol fecl₃ was identified through titration from the 0.700 g…
$\approx 71.4\%$
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0.700 g of an impure fecl₃ sample are dissolved in water to create 50.0…
\(3.08\times 10^{-3}\)
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0.700 g of an impure fecl₃ sample are dissolved in water to create 50.0…
\(1.541\times 10^{-3}\) (so the first box is \(1.541\) and the second box is \(-3\))
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fecl₃ reacts with h₂c₂o₄ through the redox reaction below. 2fe³⁺(aq) + …
3
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2.284 g of tin was oxidized through the titration. what is the mass per…
$22.84$
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assuming the full 0.01924 moles of tin(ii) reacts, what mass of tin was…
\( 2.284 \) (or depending on significant figures, it can be adjusted. If we consider the given moles \( 0.01924 \) (four significant figures) and molar mass \( 118.71 \) (five sig…
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the redox titration reached the endpoint when 0.01924 mol triiodide sol…
0.01924
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a sample of a tin containing ore is dissolved in sulfuric acid. the red…
\(0.01924\) (or more precisely \(0.0192376\)) moles of \(\ce{I_3^-}\) were used.
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question 7 (10 points) how many atoms are in 2.50 g of silicon (si) a 5…
a. $5.36\times10^{22}$
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question 6 (10 points) how many atoms are in 0.500 g of magnesium (mg) …
b. $2.47\times10^{22}$
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question 5 (10 points) how many atoms are present in 0.850 g of sulfur …
a. $1.60\times10^{22}$
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question 4 (10 points) what mass (in grams) corresponds to 4.50×10²³ at…
c. 39.2g
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question 3 (10 points) how many atoms are present in 12.0 g of carbon a…
c. $5.99\times10^{23}$
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question 2 (10 points) a student has 4.20 g of phosphorus (p). how many…
d. $8.37 \times 10^{22}$
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question 1 (10 points) what mass of oxygen atoms (o) contains 6.022×10²…
b. 1.60g
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what are examples of health science careers? select five options regist…
A. Registered Nurse D. Emergency Medical Technician E. Dentist F. Surgeon H. Medical Assistant
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what are examples of science, technology, engineering, and mathematics …
☑️ Zoologist ☑️ Chemist ☑️ Robotics Engineer
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a eudiometer is a laboratory device that measures ______. the change in…
the change in volume of a gas mixture following a physical or chemical change
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the student miscalculates the amount of hcl(aq) to use in the reaction.…
The experimentally determined value for \( R \) will be lower than the gas constant reported in literature. (The option with this text, e.g., the third radio button option as per …
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a student experimentally determines the gas law constant, r, by reactin…
The experimentally determined value for \( R \) will be higher than the gas constant reported in literature. (The option: "The experimentally determined value for \( R \) will be …
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part 2 of 2 for the statements below, identify the possible source(s) o…
- The student uses the barometric pressure for the lab to calculate \( R \) - An air bubble enters the eudiometer before the student starts collecting hydrogen gas. The student no…
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match each job example with its career cluster. jake is a flight attend…
- Jake is a Flight Attendant → Transportation and Logistics - Arnie is a Chemist → Science, Technology, Engineering, and Mathematics - Israel is a Cashier → Marketing, Sales, and …
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hydrogen gas, oxygen gas, and water vapor are collected in eudiometer. …
\(266\space mmHg\)
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part: 1 / 2 part 2 of 2 how many moles of hydrogen gas are collected if…
0.119
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in the lab, a student collects hydrogen gas over water in a eudiometer.…
$\text{Mg}(s) + 2\text{HCl}(aq) ightarrow \text{MgCl}_2(aq) + \text{H}_2(g)$
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magnesium metal is reacted with hydrochloric acid to produce hydrogen g…
1.03 atm
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question 2 of 9 (1 point) | question attempt: 1 of 1 1 2 the pressure o…
The pressure of the gas will decrease because there will be less collisions due to the increase in total volume.
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sometimes in lab we collect the gas formed by a chemical reaction over …
\( \approx 0.16 \, \text{g} \) (or \( 0.14 \, \text{g} \) if accounting for water vapor, but typical assumption for simplicity gives ~0.16 g)
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incorrect your answer is wrong. in addition to checking your math, chec…
\( \boxed{0.68} \)
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a reaction between liquid reactants takes place at 5.0 °c in a sealed, …
$\boxed{0.68}$ (rounded to two significant figures, or 0.677 as precise; adjust based on sig figs: 31 g has two, 35.0 L three, 5.0 °C two. So two sig figs: 0.68 atm)
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methane gas and oxygen gas react to form water vapor and carbon dioxide…
$\boxed{6.4\ mL}$
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3. distinguish between an ion and polar molecule.
- **Ion**: A charged particle (atom/group of atoms) with net +ve/-ve charge (e.g., \( \text{Na}^+ \), \( \text{Cl}^- \)), formed by electron loss/gain. - **Polar Molecule**: A neu…
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2. which elements are most common in the human body? 3. where are elect…
The most common elements in the human body are oxygen ($\text{O}$), carbon ($\text{C}$), hydrogen ($\text{H}$), and nitrogen ($\text{N}$) (in order of decreasing abundance, with o…
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the partial pressure of carbon dioxide in the atmosphere is 0.239 mmhg.…
- atm: \( 3.14\times 10^{-4}\) - torr: \( 0.239\)
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determine the amount of alcl₃ produced (in moles) if you began with 13.…
0.482 mol
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to convert between moles of a reactant and moles of a product we use __…
the molar ratio
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to convert between g and moles of a substance we use ____. the molar ma…
the molar mass of the substance
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3. draw the ph scale and label your items on the scale. add 3 additiona…
### Step-by-Step Explanation for Drawing the pH Scale and Labeling: #### Step 1: Understand the pH Scale Basics The pH scale ranges from 0 to 14. A pH of 7 is neutral (e.g., pure …
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6 systems of equations: word problem practice objective: use the desmos…
\( x = 8 \) liters of the 20% salt solution and \( y = 4 \) liters of the 50% salt solution.
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which of the following correctly converts 15.0 °c to kelvin using corre…
288.15 K
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part 3 of 3 convert 52 ml to l. 520 l 0.052 l 5200 l 0.52 l
0.052 L (corresponding to the option "0.052 L")
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piles of aluminum cans floating at sea would be an example of ______. a…
b. macroscopic pollution
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which type of energy relates to the vibrations of particles and waves?\…
B. Sound energy
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hydroelectric dams use the power of flowing water to operate a generato…
B. Kinetic to electric
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review the details below. - worker bees are sterile females that search…
Queen bees, worker bees, and drones all have specific functions in their hives.
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heat transfer part 1: practice (21 total questions) purpose: gain a bet…
### First Section 1. A blue color: I 2. Density: I 3. Flammability: I 4. Sour Taste: I ### Second Section 1. NaCl (table salt) dissolves in water: I 2. Heat changes water into ste…
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heat transfer create your own phase diagram using the following informa…
2. $40^\circ\text{C}$ 3. $100^\circ\text{C}$ 4. Increase the pressure of the substance. 5. Cool the substance (lower its temperature below $5^\circ\text{C}$).
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which of the following is not true of a compound? a it has a unique com…
d. It is always made up at least partly of carbon.
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what is a substance that consists of two or more elements? enter the an…
Compound
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what elements make up a water molecule? a two atoms of hydrogen and two…
c. two atoms of hydrogen and one atom of oxygen
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short for chlorofluorocarbons, cfcs are chemical compounds. scientists …
C. cause/effect.
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write, complete, and balance the following then perform the stoichiomet…
Balanced reaction: $2\text{Al(OH)}_3 ightarrow \text{Al}_2\text{O}_3 + 3\text{H}_2\text{O}$ Initial mass of aluminum hydroxide: 390 grams
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Question was provided via image upload.
Balanced equation: \( \boldsymbol{2\ce{NaBr} + \ce{Ca(OH)2} -> \ce{CaBr2} + 2\ce{NaOH}} \) Reaction type: \( \boldsymbol{DR} \) ### Problem 2: Balancing \( \boldsymbol{\ce{NH3 + H…
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recognizing nutritional classes match each nutrient class with its desc…
- proteins → build(s) and maintain(s) tissue - carbohydrates → provide(s) a major source of energy for the body - water → help(s) cleanse the body of toxins - vitamins → facilitat…
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determine the name of the ionic compounds listed below: 1. na₂s sodium …
### Part 1: Naming Ionic Compounds (Checking the Answers) For ionic compounds, we name them by stating the cation (metal) first and then the anion (non - metal, with its ending ch…
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write an inequality for each graph. chemistry the boiling point of a li…
\( x > 0.5 \) #### 2. Second Graph:
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which is the electron configuration for lithium?\ \\(1s^2\\)\ \\(2s^3\\…
C. \(1s^22s^1\)
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which is the electron configuration for zinc? 1s²2s²2p⁶3s²3p⁶4s²3d⁸ 1s²…
D. \(1s^22s^22p^63s^23p^64s^23d^{10}\) (assuming the last option is D; if options are labeled differently, adjust the label but keep the configuration text)
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if a shell can hold a maximum of 32 electrons, what is the value of n? …
4 (corresponding to the option "4")
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to show the electron configuration for an atom, what is the advantage o…
B. Orbital notation shows the spin of the electrons.
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which characteristic is given by the principal quantum number? orbital …
A. orbital size
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two representations of the distribution of electrons in the potassium a…
Model 2 because it shows an electron in the outermost ring.
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1s²2s²2p⁶3s² which diagram shows the correct distribution of electrons …
To determine the correct electron shell distribution for a magnesium atom: 1. **Total Electrons**: The electron configuration \(1s^2 2s^2 2p^6 3s^2\) gives \(2 + 2 + 6 + 2 = 12\) …
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consider the electron configuration. which element has this electron co…
chlorine (corresponding to the option "chlorine")
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which is the electron configuration for bromine?\ \\(1s^2 2s^2 2p^6 3s^…
A. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}\)
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which is a characteristic of mixtures? ○ they are chemically bonded tog…
D. They can be separated by physical processes. (assuming the options are labeled A - D as is common, with the last option being the correct one)
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what can a drop of liquid mercury be described as? a pure substance and…
D. a pure substance and an element (assuming the last option is labeled D; if the original options were labeled differently, adjust the label to match the last option which is "a …