Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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12. consider the following thermochemical equation: $2\\ zns_{(s)} + 3\…
$-1.009 \times 10^3\ \text{kJ}$ --- ### Problem 12b
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how many moles of electrons are transferred during the reaction? 2li(s)…
2
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calculate the cell potential ($mathrm{e_{cell}^circ}$) for the reaction…
\(5.92\)
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une chemise a skirt hat a button - down shirt shorts (one pair)
a button - down shirt
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read the stanza from \the battle of blenheim.\ it was a summer evening,…
B. ABCBDD
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question 3 (5 points) according to smarthistory, which of the following…
e) all of the above
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a current of 5.25 a is applied to the aluminum sulfate solution for 112…
\( \approx 3.29 \)
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aluminum plating is sometimes used to reduce corrosion in materials exp…
3
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which statement is false for an electrolytic system with the given $e_{…
The false statement is: The cathode gains mass.
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a current of 20.0 a is applied to a zn⁺² solution. how many seconds wil…
\( \approx 2210\) (or more accurately, using precise calculations: first, moles of Zn: \( \frac{15.0}{65.38} \approx 0.2294\), moles of \( e^- \): \( 0.2294\times2 = 0.4588\), cha…
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solid zn is reduced from znso₄ solution. how many moles of electrons ar…
2 moles of electrons are transferred during the reduction of \(Zn\) (from \(Zn^{2+}\) to \(Zn\)).
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how many minutes will it take to plate the spoon with 0.25 g silver? $\…
$\boxed{0.93}$ (or approximately 0.93 minutes; if there was a miscalculation, maybe I messed up, but according to the steps, this is the result) Wait, no, wait, I think I see the …
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a current of 6.00 a is applied to the chromium(iii) nitrate solution fo…
\( 4.85 \)
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chrome plating is commonly used in vehicle manufacturing for both corro…
3
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question 16 not yet answered marked out of 1.00 flag question is mixing…
1. Question 16: a. Physical 2. Question 17: b. Chemical 3. Question 18: a. Physical 4. Question 19: b. Chemical
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attempt 1 in progress next up: submit assignment available until mar 20…
pressure, temperature, and volume
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using the thermodynamic information in the aleks data tab, calculate th…
-16 (assuming the calculation with standard values rounds to -16, but actual value depends on ALEKS data; if using the typical values, the answer is -16 J/K)
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energy linking literacy post - reading create a graph sketch of how pho…
A labeled endothermic graph for photosynthesis: 1. **Axes**: - Y-axis: Energy - X-axis: Reaction Progress 2. **Reactants**: Mark a horizontal line at lower energy, labeled $\text{…
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______ $c_3h_8$ + _________$o_2$ $rightarrow$ _________ $co_2$ + ______…
Approximately \( 51.9 \, \text{g} \) (or more precisely \( \approx 52 \, \text{g} \)) of propane are combusted.
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how many grams of $c_2h_5oh$ are there in 2.58 mol? 25g of nacl = _____…
$\approx 0.428$
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c₂h₅oh: 46.08 g/mol how many grams of c₂h₅oh are there in 2.58 mol?(10 …
The mass of \(\ce{C2H5OH}\) is \(\boldsymbol{118.89\space g}\) (rounded to two decimal places) or \(118.8864\space g\) (exact value from calculation).
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what is the molar mass of the following compounds? (5 points each) fe₂o…
s: - $Fe_2O_3$: $\boldsymbol{159.7\ g/mol}$ (or $160\ g/mol$ approximately) - $H_3PO_4$: $\boldsymbol{98.00\ g/mol}$ - $FeBr_3$: $\boldsymbol{295.55\ g/mol}$ (or $296\ g/mol$ appr…
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questions: 1. what type of reaction is this?(circle one) endothermic ex…
To solve the problem, we need to know the mass of the gummy bear (glucose, \( C_6H_{12}O_6 \)) used. Let's assume the mass of the gummy bear (glucose) is \( m \) grams. First, we …
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csub california state university, bakersfield department of chemistry e…
Since the problem here is about filling out the data and observations for the "Exploding Gummy Bears" experiment (a chemistry - related experiment), we can describe what is typica…
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student grades on a chemistry exam were: 79, 78, 76, 82, 86, 50, 79, 81…
B. The two outliers are 50 (because it lies 1.5 × IQR below the first quartile) and 99 (because it lies 1.5 × IQR above the upper quartile).
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choose the option from the drop - down menus that is best described by …
- Involves combining of nuclei: nuclear fusion - Produces dangerous radioactivity: both - Have high activation energies: nuclear fusion - Releases large amounts of energy: both - …
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use the periodic table to complete each nuclear fusion equation.\\(\\ce…
A: $5$ B: $2$ C: $15$ D: $8$ E: $\text{O}$
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what is the empirical formula for methamphetamine (shown below)?
$\boxed{C_{10}H_{15}N}$
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calculate the mass, in grams, of 0.2 moles of mn. the mass of one mole …
The mass of 0.2 moles of Mn is 10.988 grams.
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determine the mass in grams of 2.91 moles of licl.
\(123\space g\) (or more precisely \(123.35\space g\))
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part i qualitative tests 1. colors of the following gases: nitrogen dio…
1. Colors of the following gases: Nitrogen dioxide: Reddish-brown Nitric oxide: Colorless Chlorine: Pale greenish-yellow Hydrogen chloride: Colorless Hydrogen: Colorless Oxygen: C…
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what is one of the rare earth elements mentioned in the text? silver sc…
B. Scandium
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a patient comes to crouse hospital for her chemotherapy infusion. she a…
- "There are new guidelines in place to keep healthcare workers, patients, and the environment safe."
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which of the following do e - cigarette users inhale and exhale for oth…
1. False 2. All options apply: - Heavy metals such as nickel, tin and lead - Cancer causing chemicals - Volatile organic compounds - Flavorings such as diacetyl, a chemical linked…
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7. _zn + _hcl → _zncl₂ + _h₂ balanced equation: ___________ molar mass …
### Problem 7 Balanced Equation: $\boldsymbol{\text{Zn} + 2\text{HCl} ightarrow \text{ZnCl}_2 + \text{H}_2}$ Molar Mass of Reactants (g/mol): Zn: 65.38, HCl: 36.46 Molar Mass of P…
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question 4 (multiple choice worth 2 points) (05.02r mc) amara wants to …
Sonnet
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read the poem \a jelly - fish\ by marianne moore. then, answer the ques…
Free verse (a form of poetry with no fixed rhyme scheme, meter, or regular line structure)
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match each poetry term with its correct description. match term definit…
Line length - A) Determined by the sets, or feet, of stressed and unstressed syllables in a line of poetry Rhyme scheme - D) The pattern of letters assigned to the common sounds o…
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ronan is reading a poem that repeats the same two lines throughout its …
D. Villanelle
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way down south in dixie (break the heart of me) they hung my black youn…
C. AABA ABCB AABA (Go to #11)
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read the first stanza of the ballad \paul reveres ride\ by henry wadswo…
AABBA
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chemical reactions \writing formula equations\ - ws #1 directions: conv…
\( 4\text{Na} + \text{O}_2 ightarrow 2\text{Na}_2\text{O} \) ### Problem 2:
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equations” - ws #1 directions: convert the following word equations int…
$$4Na + O_2 ightarrow 2Na_2O$$ ### Problem 3:
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1. most of our electricity comes from the conversion of _______________…
chemical (or mechanical, depending on context; but most common is chemical) ### Question 2
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reinforcing exercise in 1928, bacteriologist alexander fleming was stud…
Fleming's chance observation of the antibacterial properties of mold led to the discovery of penicillin as a treatment.
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8. the molar mass of glucose (c6h12o6) - a) 12,g/mol - b) 180,g/mol - c…
b) 180,g/mol
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7. which of the following compounds has a molar mass of 44.0 g/mol a) c…
a) CO2
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choose the correct answer from the choices for each question: 6. what i…
c) 58.5 g/mol
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fill in the blank fill in the blank with the correct words: 1. the mola…
1. 18.02 (or 18) 2. atomic masses 3. 44.01 (or 44) g/mol 4. g/mol 5. atomic masses
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stoich ws 3 1. how many molecules of o₂ gas must react to form 0.68 gra…
Approximately $4.73 \times 10^{20}$ molecules of $\ce{O2}$ ### Problem 2
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two or more atoms of different elements that are chemically combined. 1…
Compound (the term in the red box corresponds to the definition "Two or more atoms of different elements that are chemically combined")
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what are the two types of properties matter has? select all correct opt…
C. physical, D. chemical (assuming the red is option C and blue is D; if labels are different, the correct options are the ones with "physical" and "chemical" text)
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which is a measure of the amount of space matter takes up? volume weigh…
A. volume
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pop quiz name_____________________ multiple choice. choose the one alte…
A. 129.3 mL of 0.145 M solution of KCl ### Question 2
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period structions: determine the number of grams in each of the quantit…
1. 2.5 moles of NaCl: $\boldsymbol{146.25\ \text{g}}$ 2. 0.50 moles of $\text{H}_2\text{SO}_4$: $\boldsymbol{49\ \text{g}}$ 3. 1.70 moles of $\text{KMnO}_4$: $\boldsymbol{268.6\ \…
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name mayela conzalez date 2-4-2026 period 1st $100 chemistry: measureme…
If we use the correct molar mass of \( NaCl \) (\( 58.44\space g/mol \)): \( \approx0.347\space mol \) If we use the incorrect molar mass as in the text ( \( 35.45\space g/mol \),…
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focusing on signature dishes in an effort to meet the new demands of di…
quality over quantity
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verify your calculation. in your set-up, do your units cancel? mass of …
\( \approx 0.000782 \, \text{mol} \) (or more precisely, \( \frac{0.019}{24.305} \approx 7.82 \times 10^{-4} \, \text{mol} \))
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mass of magnesium (g) 0.217 moles of magnesium (mol) blank box
The moles of magnesium is approximately $0.00893\ \text{mol}$ (or depending on significant figures, could be adjusted, for example, if we consider three significant figures from 0…
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gases produced by a chemical reaction can easily be collected over wate…
\( 627.6 \) mmHg
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enrichment: geology of the appalachians read the passage below and comp…
| Environment | Event | Rock Type | |-------------|-------|-----------| | Shallow seas along the edge of North America | Thick layers of clay, sand, and organic material are depos…
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the component of a solution that is present in a smaller amount is call…
FALSE
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section iii: critical thinking 17. the polyatomic ion bromate, bro₃¹⁻, …
Bromite ion: $\boldsymbol{\ce{BrO2^-}}$ (charge -1) Bromic acid: $\boldsymbol{\ce{HBrO3}}$ Bromous acid: $\boldsymbol{\ce{HBrO2}}$
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7. hcn section ii: formulas for binary acids and oxyacids correctly wri…
s: 9. \(\boldsymbol{\ce{H_3PO_4}}\) 10. \(\boldsymbol{\ce{HBr}}\) 11. \(\boldsymbol{\ce{H_2SO_3}}\) 12. \(\boldsymbol{\ce{HClO_4}}\) 13. \(\boldsymbol{\ce{HF}}\) 14. \(\boldsymbol…
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question 42 not yet answered marked out of 1.00 flag question is the fo…
1. a. Chemical 2. b. Physical 3. b. Homogeneous mixture
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is the following a heterogeneous mixture, a homogeneous mixture, an ele…
a. Heterogeneous mixture
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question 48 not yet answered marked out of 1.00 flag question is the fo…
1. a. Heterogeneous mixture 2. d. Compound 3. a. Heterogeneous mixture
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question 45 not yet answered marked out of 1.00 flag question is the fo…
Question 45: a. Heterogeneous mixture Question 46: a. Heterogeneous mixture Question 47: c. Element
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question 38 not yet answered marked out of 1.00 flag question is the fo…
Question 38: b. Physical Question 39: a. Chemical Question 40: a. Chemical Question 41: b. Physical
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question 35 not yet answered marked out of 1.00 flag question is the fo…
Question 35: a. Chemical Question 36: b. Physical Question 37: b. Physical
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question 32 not yet answered marked out of 1.00 flag question is the fo…
Question 32: a. Chemical Question 33: b. Physical Question 34: b. Physical
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question 31 not yet answered marked out of 1.00 p flag question match e…
- Vanadium: V - Fluorine: F - Scandium: Sc - Sodium: Na - Neon: Ne - Boron: B - Calcium: Ca
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match the term with the correct definition. properties that can be obse…
1. Properties that can be observed without changing the chemical composition of the sample of matter: **Physical Properties** 2. Describes an occurrence that has been tested under…
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fill in the blanks. how close multiple measurements are to each other i…
1. Precision 2. Accuracy 3. Qualitative 4. Quantitative 5. Estimated 6. Coefficient 7. Infinite
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question 20 not yet answered marked out of 1.00 flag question is meltin…
a. Physical --- ### Question 21
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question 13 not yet answered marked out of 1.00 flag question is trix c…
Question 13: b. Heterogeneous mixture. Question 14: a. Element. Question 15: a. Physical
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question 10 not yet answered marked out of 1.00 flag question is a penn…
Question 10: b. Heterogeneous mixture. Question 11: c. Compound. Question 12: c. Compound.
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question 7 fill in the blank. in the gas state, a substance will have a…
1. d. Indefinite 2. c. Bonded 3. b. Heterogeneous mixture.
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question 4 not yet answered marked out of 1.00 flag question fill in th…
Question 4: c. Matter Question 5: b. Physical Question 6: a. Analysis
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quiz navigation question 1 not yet answered marked out of 1.00 flag que…
1. b. Chemical 2. a. Freezing 3. d. Liquid
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11. consider the following combination reaction: sodium metal reacts wi…
$\boldsymbol{2\text{Na} + \text{Cl}_2 ightarrow 2\text{NaCl}}$ $\boldsymbol{\text{Cl}_2 + 2\text{Na} ightarrow 2\text{NaCl}}$
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2. steel wool is composed of iron. steel wool reacts with oxygen in the…
Fe, $\text{O}_2$ (To complete the selection, check the box for $\text{O}_2$ along with the already checked $\text{Fe}$)
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2. use experimental data to determine the relative mass of two objects.
To solve the problem of determining the relative mass of two objects using experimental data, we can follow these steps: ### Step 1: Choose an appropriate experimental method One …
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7. make up your own model that shows conservation of mass:
In the final empty box, draw the 4 original triangular shapes plus the square with the number 5 inside. The total mass of the left side is $4m + 5m = 9m$, and the right side will …
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6. make a model to show that mass is conserved. what is the mass?, what…
Red Bricks: 3 Blue Bricks: 2 What might the product look like? A single connected structure made by joining all 3 red 2g bricks and 2 blue 3g bricks together (e.g., a long chain o…
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5. iron + chlorine longrightarrow iron chloride how many of each atom a…
Reactants: Fe: 2 Cl: 6 Products: Fe: 2 Cl: 6
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what happens when we combine hydrogen and oxygen to form water molecule…
1. **Chemical Reaction & Equation**: Hydrogen and oxygen undergo a synthesis (combustion) reaction to form water, following the balanced equation: $$2\text{H}_2 + \text{O}_2 ighta…
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write the formula for how a chemical reaction happens.
General formula for a chemical reaction: $$\text{Reactants} \xrightarrow{\text{Conditions}} \text{Products}$$ For a balanced example (e.g., combustion of hydrogen): $$2\text{H}_2 …
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c₂h₄o₂ + nacho₃ ⟶ co₂ + nac₂h₃o₂ + h₂o vinegar baking soda carbon dioxi…
| Products | Reactants | |----------|-----------| | 1 Total Na atoms | 1 Total Na atoms | | 5 Total O atoms | 5 Total O atoms | | 3 Total C atoms | 3 Total C atoms | | 5 Total H a…
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the chemical equation shown below is a model that helps us see the rear…
## Filled Table: | Products | Reactants | |------------------------|------------------------| | 1 Total Na atoms | 1 Total Na atoms | | 5 Total O atoms | 5 Total O atoms | | 3 Tot…
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2 of 10 next ▶ listed in the item bank are some important labels for se…
To solve this problem, we analyze the phase - change graph and match the labels: ### 1. Temperature Axis The vertical axis with values like \(0^{\circ}\text{C}\) and \(100^{\circ}…
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question 2 (0.83 points) mass wasting over time moves earthly materials…
Question 2: Tectonic uplift Question 3: The shear strength is weaker than the shear force
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name date ionic vs covalent bonds worksheet fill the table with the app…
| Compounds | Type of Bond | |-----------|--------------| | $\text{BaO}$ | Ionic | | $\text{Na}_2\text{O}$ | Ionic | | $\text{NI}_3$ | Covalent | | $\text{CBr}_4$ | Covalent | | $…
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draw the curved arrows and the resulting resonance structure for the fo…
### Curved Arrow Mechanism: 1. A curved arrow starts from the π bond of the C=C double bond and points towards the oxygen atom. ### Resulting Resonance Structure: A six-membered r…
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minerals with the same chemical composition, but different crystalline …
1. polymorphs 2. Kyanite
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practice: lewis structures for part 1, draw the lewis structures (also …
| Part 1 (Lewis Structure) | Part 2 (Bonding Prediction) | |---|---| | 1. $\text{Mg} \cdot \cdot$ | Lose 2 electrons to form ionic bonds | | 2. $\text{K} \cdot$ | Lose 1 electron …
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n these partial pressures: 3.5 atm n2, 2.8 atm o2, 0.25 $p_t = p_1 + p_…
Mole fraction of $\text{O}_2$: $\approx 0.43$ Mole fraction of $\text{Ar}$: $\approx 0.038$
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four gases were combined in a gas cylinder with these partial pressures…
6.7 atm
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a mixture of h₂ and water vapor is present in a closed vessel at 20.00°…
737.5 mmHg
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ionic bonding name ionic bonding occurs when a metal transfers one or m…
1. $\text{K}^{\cdot} + \cdot\ddot{\text{F}}: ightarrow \text{K}^+:\ddot{\text{F}}^-$ (KF) 2. $\cdot\text{Mg}\cdot + 2\cdot\ddot{\text{I}}: ightarrow \text{Mg}^{2+}2:\ddot{\text{I}…