Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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5. how is a mole defined? (0.5 points) * the number of ions in 20 g of …
D. The number of carbon atoms in exactly 12 g of pure carbon - 12
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21. draw the orbital diagrams and electron configurations of the follow…
a. Mg: Electron configuration: $\boldsymbol{1s^22s^22p^63s^2}$; Orbital diagram: $1s: \uparrow\downarrow,\ 2s: \uparrow\downarrow,\ 2p: \uparrow\downarrow\ \uparrow\downarrow\ \up…
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3. calculate the number of molecules in 11.5 mol of water. (0.5 points)…
D. \( 6.93 \times 10^{24} \) molecules
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2. the ____ is the si base unit used to measure the amount of a substan…
B. Mole
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1. silver nitrate is used to make several different silver halides used…
B. \( 1.96 \times 10^{24} \) formula units
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question 7 (2 points) what element is always present in an organic comp…
4) Carbon
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4. copper is an element that is required in very small concentrations i…
\(0.030\space ppm\)
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convert 60.5 g of oxygen (o₂) to moles. round your answer to 2 places a…
2.49
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of 0.518 moles of platinum (pt)? round your answer to three numbers. ty…
101
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13 what is the mass of .8 mol of cacl₂? (nearest whole number; no units)
111
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10 a sample contains 5.5 × 10²⁴ atoms of cadmium. what is the mass of t…
The mass of the sample of calcium is approximately \(\boldsymbol{366\space g}\) (or if we consider more precise steps, it can be calculated as follows: \(n=\frac{5.5\times 10^{24}…
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3 how many grams in 5.5 mol of copper? (nearest whole number; no units)
350
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how many grams in 5 moles of co₂? (nearest whole number; no units)
220
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question 43 of 49 identify the optimum c-c-c bond angle for each of the…
1. Topmost (alkyne $\text{CH}_3\text{C}\equiv$): $180^\circ$ 2. Second top (middle alkyne $\equiv\text{C}-$): $180^\circ$ 3. Third top ($\equiv\text{C-CH}_2-$): $109.5^\circ$ 4. C…
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a quatrain is a stanza consisting of ___ lines. * 2 3 4 5 what is a ref…
1. 4 2. A line or group of lines that repeats throughout a poem to add emphasis
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a free verse poem ______. * - has no regular rhyme or meter - always te…
1. Has no regular rhyme or meter 2. A grouping of lines in a poem 3. A single row of words in a poem
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a couplet is a stanza consisting of ___ lines. * 2 3 4 5 the meter of a…
1. 2 2. The pattern of stressed and unstressed syllables 3. The pattern of similar sounding sounds at the end of each line, alphabetical (A B C)
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15 fill in the blank 5 points the type your answer... is the subatomic …
proton
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unit 2 - types of matter and the atom 1. explain what each of the follo…
An element is a pure substance composed of only one type of atom (particles: single atoms or molecules of the same atom). Bonding: metallic (for metals), covalent (for diatomic el…
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8. aqueous sodium phosphate reacts with aqueous calcium chloride to for…
### Question 8: Reactants: Aqueous sodium phosphate ($\text{Na}_3\text{PO}_4$), aqueous calcium chloride ($\text{CaCl}_2$) Products: Solid calcium phosphate ($\text{Ca}_3(\text{PO…
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8.____ al + ____ fe₂o₃ → ____ al₂o₃ + ____ fe 9.____ na + ____ i₂ → ___…
8. $2\text{Al} + 1\text{Fe}_2\text{O}_3 ightarrow 1\text{Al}_2\text{O}_3 + 2\text{Fe}$ 9. $2\text{Na} + 1\text{I}_2 ightarrow 2\text{NaI}$ 10. $2\text{Mg} + 1\text{O}_2 ightarrow …
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physics & chemistry worksheet: light and the atom name: date: period: p…
1. Amplitude - B. The height of a wave from the origin to the crest. 2. Atomic Emission Spectrum - A. The specific frequencies of light emitted by an element. 3. Electromagnetic R…
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balancing equations worksheet name balance the following equations and …
### Problem 2: Balancing \( \boldsymbol{\text{Fe} + \text{HCl} ightarrow \text{FeCl}_3 + \text{H}_2} \) # Explanation: ## Step 1: Balance Fe atoms On the left, we have 1 Fe atom. …
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8.\\underline{\\quad\\quad} al + \\underline{\\quad\\quad} fe₂o₃ → \\un…
2, 1, 1, 2 ### Problem 9:
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question 11 of 49 draw the lewis structure of h₂so₄ with minimized form…
The Lewis structure has a central sulfur atom bonded to two oxygen atoms via double bonds (each double-bonded O has 2 lone electron pairs) and two oxygen atoms via single bonds. E…
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what process is responsible for the sun’s production of energy? ○ nucle…
1. Nuclear fusion of hydrogen into helium 2. The amount of helium will increase, and the amount of hydrogen will decrease over time.
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question 10 of 40 consider these structures, methylene ethyl radical fo…
### First question (formal charge 0 on electron-bearing C): both ### Second question (net charge 0): both
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add lone pairs to compound a.
The final structure has each sulfur atom with 2 lone pairs: ``` H | H - C - S::S::C - H | | H H ``` (Each `::` represents 2 lone pair electrons, so each S has 4 non-bonding electr…
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question 33 of 49 identify the major and minor resonance contributor(s)…
Identify the major contributor(s): A. $\ce{H-C(=O)-O^{-}}$ (structure A), B. $\ce{H-C(=O^{-})-O}$ (structure B) Identify the minor contributor(s): C. $\ce{H-C^{+}(-O^{-})-O^{-}}$ …
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organic chemistry loudon roberts & company publishers presented by macm…
O−N=O angle: 120 N−C−H angle: 109.5
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organic chemistry loudon roberts & company publishers presented by macm…
H-C-H angle: $120$ ° C=C=C angle: $180$ °
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question 47 of 49 organic chemistry loudon roberts & company publishers…
$^+CH_3$: $120^\circ$ $SiCl_4$: $109.5^\circ$
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predict the approximate bond angle in the molecule. o(=o^+)-o^- (with l…
Approximately $117^\circ$ (or slightly less than $120^\circ$)
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the image shows a chemical structure of a molecule with a central o ato…
$\boldsymbol{sp^3}$
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indicate the hybridization of the central atom in each molecule shown. …
First molecule (CO₂): sp Second molecule (BeF₂): sp
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question 37 of 49 determine the hybridization of the central atom for e…
For $\text{AlCl}_4^-$: $\boldsymbol{sp^3}$ For $\text{S=C=S}$: $\boldsymbol{sp}$
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several alkene compounds are shown. indicate if each compound can exist…
1. Can $\text{CH}_3\text{CH=CHCH}_3$ exist as stereoisomers? yes 2. Can $\text{CH}_3\text{CH=CBrCH}_2\text{CH}_3$ exist as stereoisomers? yes 3. Can the drawn branched alkene exis…
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question 40 of 49 a 3d representation of a cyclohexane (c₆h₁₂) molecule…
geometry: tetrahedral What is the hybridization of each carbon atom? $\boldsymbol{sp^3}$
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assessment questions 1. which unit is used to measure mass in the metri…
1. Gram 2. 506.4 g
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question 42 of 49 match the molecular geometry (from the answer bank) t…
1. Top $\text{CH}_2$: trigonal planar 2. Middle $\text{CH}$: trigonal planar 3. First $\text{CH}_2$ (below $\text{CH}$): tetrahedral 4. Second $\text{CH}_2$ (below first $\text{CH…
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predict the approximate molecular geometry of a formaldehyde molecule: …
trigonal planar
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predict the approximate molecular geometry around each carbon atom of a…
The carbon atom in $\text{CH}_3$ is: tetrahedral The nitrile carbon atom ($\text{C≡N}$) is: linear
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7. solid calcium carbonate breaks down into solid calcium oxide and car…
Reactants: Solid calcium carbonate ($\text{CaCO}_3$) Products: Solid calcium oxide ($\text{CaO}$), carbon dioxide gas ($\text{CO}_2$) Balanced equation: $\text{CaCO}_3(s) \xrighta…
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6. hydrogen gas reacts with nitrogen gas to form ammonia. reactants: pr…
Reactants: Nitrogen gas ($\text{N}_2$), Hydrogen gas ($\text{H}_2$) Products: Ammonia ($\text{NH}_3$) Balanced equation: $\text{N}_2 + 3\text{H}_2 ightarrow 2\text{NH}_3$
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4. a graduated cylinder contains 20.0 ml of water. after a rock is plac…
$14.0\ \text{cm}^3$ (or $14.0\ \text{mL}$)
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assessment questions 1. what volume is shown in the graduated cylinder …
1. 28 mL 2. 14 mL
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determine the formal charge on the nitrogen atom in each of the structu…
0 (corresponding to the option "0") ### For Structure B (NH₂ - attached to benzene ring)
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add lone pairs to compound b.
The structure with lone pairs added has: - 2 pairs of non-bonding electrons (lone pairs) on the double-bonded oxygen atom - 1 pair of non-bonding electrons (lone pair) on the nitr…
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add lone pairs to compound a.
The final structure has **two lone electron pairs on each sulfur atom**, resulting in the structure: ``` H H | | H - C - S - S - C - H | | H H (each S has two pairs of dots: :S-S:…
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a reporter is covering a protest at a local chemical plant suspected of…
Minimize harm because the protester might be affected by the interview. Seek truth from another source, because the protester made a statement about a major issue
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value: 3 ______ pest control mechanisms help reduce the carbon footprin…
b. Natural
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value: 3 identify the advantage(s) of organic farming. a. slows down gl…
f. Both A and C
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value: 3 due to ________ farming, more animals and plants can live in t…
c. Organic
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6. what family of organic compounds has historically been used in the c…
c) esters
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the water cycle includes living elements and non-living geological proc…
Biogeochemical cycle
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unit d final review have you mastered the concepts, applications, and s…
1. 0.500 mol of hydrogen gas 2a. 2.00 mol of elemental sulfur 2b. 0.100 mol of barium sulfide
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dissociation - the process by which chemical compounds break apart to f…
1. Reactions Between Ions: Reactions of dissolved ionic species in solution 2. Spectator Ions: Unchanged, non-participating ions in a reaction 3. Precipitate: Insoluble solid prod…
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46. describe the effect that increasing temperature has on the vapor pr…
Increasing the temperature of a liquid increases its vapor pressure. This is because higher temperature gives liquid molecules more kinetic energy, so more molecules can escape th…
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44. explain why increasing the temperature of a liquid increases its ra…
Increasing the temperature of a liquid increases the average kinetic energy of its molecules (via \( KE=\frac{3}{2}kT \), where \( k \) is Boltzmann’s constant and \( T \) is temp…
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34. change 1656 kpa to atm.
\(1656\ \text{kPa}\) is approximately \(16.34\ \text{atm}\)
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molecular masses calculate the molecular mass (in amu’s) for these mole…
To solve for the molecular mass of each compound, we use the atomic masses (in amu) of the constituent elements: \( \text{Na} = 22.99 \), \( \text{N} = 14.01 \), \( \text{O} = 16.…
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ii. atomic masses copy the masses of the following common elements. use…
| Element | Atomic Mass (amu) | |---------|-------------------| | H | 1.01 | | C | 12.01 | | S | 32.07 | | O | 16.00 | | Ca | 40.08 | | N | 14.01 | | Na | 22.99 | | Cl | 35.45 |
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10. a certain element has two naturally occurring isotopes with mass nu…
### Part (a) To determine the element, we first recall that the atomic mass of an element is a weighted average of its isotopes' masses. The formula for atomic mass ($A$) is $A = …
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lorganisation et le contenu du texte descriptif lecture annotée jadore …
La phrase est : "Prendre une photo réunissant des milliers de personnes représente tout un défi, n'est - ce pas? C'est l'exploit qu'a réussi à faire Arthur Mole, un photographe br…
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unit 6 lesson 6 additional practice problems 1. the two graphs show mod…
The weed represented by the graph with the lower y - intercept (smaller initial value on the y - axis at \( d = 0 \)) covered a smaller area when the chemicals were applied. We kn…
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select the correct answer. which of the following is a major disruptor …
D. burning of fossil fuels
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3. try another one. consider a fictitious molecule, x₅ya₃. the molar ma…
\(139.25\)
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name______ first semester review worksheet-version 2 to receive any cre…
\(3.76\times10^{23}\) molecules ### Question 2:
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which of the following supports the main idea of the text? a to buy cig…
C. The tobacco leaves they harvest have dangerous chemicals on them: nicotine and pesticides.
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a chemist mixes 4 liters of one acid solution with 10 liters of a 40% s…
0.05
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7. what does the term \tolerance\ refer to in the context of addiction?…
7. B. Needing more of the drug to feel the same effects 8. D. Drinking large quantities of alcohol in a short period 9. C. Lay them on their side (BACCHUS) 10. B. To track alcohol…
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nov 1, 2025 homework due 11.5.25 rock transformation chapter 3/lesson 4…
1) Land is made out of rocks and soil. 2) Rocks are made out of one or more minerals. 3) The rock cycle describes three things: how rocks are formed, how they break apart, and how…
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goal: create a model that represents groups of atoms that could make up…
A valid repeating group for Sample 2 is: ``` H H | | H-C-C-H | | H H ``` (This is ethane, $C_2H_6$, which is a colorless liquid/gas near room temp, matches the gasoline-like hydro…
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1. a student conducted an experiment with a chamber filled with nitroge…
1. B. She placed the chamber in an ice bath. 2. | Oxygen Molecules Before Cooling | Oxygen Molecules After Cooling | |----------------------------------|--------------------------…
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5. explain why understanding bonding is important for understanding mol…
Understanding bonding is critical because it defines the structure, stability, and properties of molecules. Bonding determines how atoms arrange themselves to form molecules, whic…
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. what is the empirical formula for a compound that is 50.8% zinc, 16.0…
s: 4. (Original work had errors, but intended answer) $\boldsymbol{ZnPO_2}$ (Note: Correct empirical formula should be rechecked, but based on original work, ZnPO₂) 5. (Simplified…
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directions: show all of your work for each of the following problems. u…
$\boldsymbol{C_3H_7}$ ### Problem 2:
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6 pour chacune des réactions globales suivantes, déterminez : 1) les éq…
Pour résoudre la variation d'enthalpie molaire standard de la réaction globale, on utilise la **loi de Hess** (ou la relation entre l'enthalpie de réaction et les enthalpies de fo…
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question 4 (1 point) which one of these are not an example of how schem…
Question 4: Telling someone your darkest fears within the first five seconds of sitting next to them at the local burger shop. Question 5: Assumption
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exercices 7 chaque transformation énoncée ci-dessous représente-t-elle …
A) P B) C C) P D) P E) C F) P G) C H) C I) P
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5. pour chaque changement mentionné, indiquer le ou les indices qui per…
A) C. Une grande quantité d'énergie est dégagée. B) A. Il y a un changement de couleur, F. Le changement n'est pas réversible C) B. Il y a un changement de température, D. Il se d…
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4. parmi les transformations suivantes, cochez celles qui représentent …
B) Les feuilles des arbres qui rougissent à l'automonne. C) Une tranche de pain qui est digérée. F) Un jeans qui se décolore sous l'action de l'eau de Javel. H) Le moteur de la to…
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what is the % yield if 20 grams of hydrogen is reacted with 32 grams of…
25 %
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what is the % yield if 4 moles of hydrogen is reacted with 3 moles of o…
75%
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an organic synthesis to make the pain reliever acetominophen is suppose…
80%
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if we react 30 grams of ethane ($c_2h_6$) with 320 grams of oxygen, how…
88 grams
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consider the combustion of ethane reaction below for the next two quest…
8
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which are transformations that occur in an incandescent light bulb? sel…
a. electrical to thermal energy, b. electrical to radiant energy
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how many grams of water are produced if we react 3 moles of hydrogen wi…
About 60 grams
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consider the combustion of hydrogen for the next two questions. $2h_2(g…
Hydrogen and 10 moles water produced.
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presidential retreat adapted from the national parks service catoctin m…
It is a place where Presidents can relax, unwind, contemplate, entertain distinguished guests in an informal setting, and cope with the pressures of modern-day society. Many histo…
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excerpt from a journey to the center of the earth by jules verne lookin…
B. The narrator appeases his uncle’s whims.
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select the correct text in the passage. which detail best shapes the id…
A friend is a person with whom I may be sincere.
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question # 4 multiple choice which term best describes the type of farm…
D. organic
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which of the following is the atomic radius of chlorine if the internuc…
a. 100 pm
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atoms tend to be most stable when their outermost energy level contains…
a. a full set of valence electrons
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2/10 energy levels are fixed distances from the of an atom where electr…
nucleus
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electrons in the outermost energy level are called ______ electrons. en…
valence
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5 select the correct texts in the passage. which two phrases in the exc…
To solve this, we analyze context clues for "careening": ### Step 1: Analyze "bumping into my tea before careening off into a corner" The phrase "bumping into my tea" suggests a f…
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2 select the correct text in the passage. which detail best supports th…
Still, it’s a constant war these days against the dust that sweeps across the city limits, piling worst in dead ends and cul - de - sacs, like the one that shelters The Alchemy of…