化學
化學反應、化學計量、分子結構與元素性質。
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this is an ethanol molecule. the formula for ethane is $c_2h_6o$. your …
Red balls: 6, Dark gray balls: 6, Light gray balls: 12 Wait, no, wait—ethanol's dark gray is 2 C, so glucose has 6 C, so 6/2 = 3 times ethanol's C. So dark gray balls: 2 * 3 = 6? …
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your teacher wants you to make a model for butanol (c₄h₁₀o). what suppl…
- Dark gray (C): 4 - Light gray (H): 10 - Red (O): 1 So matching: Dark gray (C) → 4 Light gray (H) → 10 Red (O) → 1
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Question was provided via image upload.
1) valence; electron pairs; both bonded atoms 2) nonmetals; nonmetals; Octet; 8; Duet 3) (Lewis structure provided as example, complete with lone pairs: ``` H ·· H··C··H ·· H ``` …
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the chemical formula for methanol is \\ce{ch_{3}oh}. which of the follo…
A. [The model with 1 gray (C), 4 white (H), 1 red (O) atoms arranged as C bonded to 3 H, 1 OH group]
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listed below are 4 negatively charged ions (nonmetals). write the formu…
## A) Li 1. $\text{Li}_2\text{S}$ 2. $\text{Li}_3\text{P}$ 3. $\text{LiI}$ 4. $\text{Li}_3\text{N}$ ## B) Pb (using +2 charge, common for such compounds) 1. $\text{PbS}$ 2. $\text…
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ethanol has the chemical formula, c₂h₆o. the atomic model is shown. dra…
- Larger gray atoms: carbon - Smaller gray atoms: hydrogen - Red atom: oxygen (Perform the drag - and - drop action: drag "carbon" to the larger gray atoms, "hydrogen" to the smal…
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b. fill in the blanks 1. the atomic number tells the number of ______. …
protons (or protons and electrons for a neutral atom) ### 2.
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Question was provided via image upload.
1. $\boldsymbol{HgBr_2}$; Electron dot diagram: $\text{Hg}^{\bullet\bullet} ightarrow \overset{\Large \bullet\bullet}{\underset{\Large \bullet\bullet}{\text{Br}:}}$, $\text{Hg}^{\…
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name _______________ period ______ date ______ 1) when bonding with non…
1) give; positively; ions 2) take; negatively | Metal Ion | Valence Electrons | Charge of Ion | Oxidation number | Nonmetal Ion | Valence Electrons | Charge of Ion | Oxidation num…
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chemical formulas name _______________ period ______date ______ 1) when…
When bonding with nonmetals, metal atoms tend to \(\boldsymbol{\text{give}}\) their valence electrons and make \(\boldsymbol{\text{positively}}\) charged atoms called \(\boldsymbo…
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oxidation numbers name __________ hour __ | element | metal or nonmetal…
To solve for each element, we analyze their properties (metal/nonmetal, valence electrons, electron gain/loss, oxidation number) using periodic table trends: ### 1. Selenium (Se) …
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complete ionic equation a. substances produced as the result of a chemi…
d. equations that shows dissolved ionic compounds as dissociated free ions (Note: Assuming the options are labeled a, b, c, d with the fourth option being d; if the original label…
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module 0: intro. to chemistry and measurement 8. how many significant d…
5 ---
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a chemical equation that does not indicate the relative amounts of the …
True
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a negatively charged ion; has gained an electron → anion true false
True
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the formulas of the reactants are connected by an arrow with the formul…
True
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a substance that speeds up a reaction but is not used up in the reactio…
A. catalyst
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chemical reaction in which an element or compound reacts with oxygen, o…
D. combustion reaction
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mall whole numbers placed in front of the formulas in the equation in o…
D. coefficients (assuming the options are labeled with letters, and "coefficients" is the correct one. If the original options had different labels, adjust accordingly, but based …
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a single compound breaks down into two or more simpler products; ab = a…
D. decomposition reaction
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1. equations for a reaction in solution that shows only those particles…
B. net ionic equation
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the chemical formula for methanol is $ce{ch_{3}oh}$. which of the follo…
D. The model with 1 carbon (gray), 3 hydrogens (white) on carbon, 1 oxygen (red) with 1 hydrogen (white) on oxygen.
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match the chemical formula with the appropriate model. methane (ch₄) me…
each compound's structure: ### Methane (\( \text{CH}_4 \)) - Has 1 carbon (black) and 4 hydrogens (white). - Matches the model with 1 black sphere (C) and 4 white spheres (H). ###…
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read this excerpt from walt whitmans poem \i hear america singing\ from…
A. present a poem with a natural, conversational rhythm.
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density practice $\\boldsymbol{d = \\frac{mass}{volume}}$ solve the fol…
1. $3.52\ \text{g/mL}$ 2. $44.5\ \text{g}$ 3. $25.5\ \text{mL}$ 4. $2.7\ \text{g/cm}^3$ 5. $8.96\ \text{g/mL}$ 6. $7.87\ \text{g/mL}$ 7. $1.5\ \text{g/mL}$
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scenario analysis: water pollution & freshwater protection directions: …
B. Farming wastes #### Question 2
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builder (practice) poisonous (adjective) poi·son·ous ˈpȯi-zᵊn-əs potent…
### Synonym(s) toxic, harmful, destructive ### Antonym(s) healthy, vital, helpful
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produce (verb) pro·duce prə-ˈdüs to make \both are very poisonous, but …
### Synonym(s) create, form ### Antonym(s) destroy, break
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react (verb) react rē-akt \iron in the metal reacts with oxygen in the …
D. to chemically interact or combine
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match the chemical formula with the appropriate model. methane (ch₄) me…
1. methane (CH₄) → Second model (black central atom with 4 gray atoms) 2. methanol (CH₃OH) → Fourth model (gray central atom, red atom, 4 small light gray atoms) 3. ethane (C₂H₆) …
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this is an ethanol molecule. the formula for ethane is $\\ce{c_{2}h_{6}…
6 red balls, 6 dark gray balls, and 12 light gray balls
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match each molecule with its atomic model. ethane (c₂h₆) methane (ch₄) …
1. ethane (C₂H₆) → 4th model (two black carbons, six white hydrogens) 2. methane (CH₄) → 2nd model (one black carbon, four white hydrogens) 3. water (H₂O) → 3rd model (one red oxy…
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your teacher wants you to make a model for butanol (c₄h₁₀o). what suppl…
Dark gray (carbon): 4 Light gray (hydrogen): 10 Red (oxygen): 1
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ethanol has the chemical formula, c₂h₆o. the atomic model is shown. dra…
1. Top-left dashed box: hydrogen 2. Middle dashed box: carbon 3. Bottom dashed box: oxygen
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| name | cation with charge | anion with charge | formula | | ---- | --…
To solve for the chemical formulas, we use the principle of charge balance: the total positive charge from cations equals the total negative charge from anions. Let's take "Vaseri…
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question 2 1 pts which is an example of demographic segmentation? selli…
B. Advertising a video game to teenagers
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the average kinetic energy of the molecules that make up sample f is 2 …
3
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lighting a match is an example of an __ process. endothermic exothermic…
B. exothermic
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in an exothermic process heat is absorbed (taken in) released rewatch
B. released (assuming the second option is labeled B, if the first was A. absorbed (taken in), B. released)
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worksheet: periodic table trends (5) name for each of the following, ci…
1. Metal: Li 2. Forms -3 anion: N 3. Largest atomic mass: Sr 4. Member of halogen family: Cl 5. Liquid at room temperature: Hg 6. Forms +2 cation: *No valid option in given set (P…
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worksheet: periodic table trends (s - 2) name for each of the following…
1. $\boldsymbol{Li}$ (member of alkali metals) 2. $\boldsymbol{S}$ (nonmetal) 3. $\boldsymbol{K}$ (member of alkali metals) 4. $\boldsymbol{Br}$ (member of the halogen family) 5. …
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soot results from burning organic compounds. soot is an example of a a …
A. a primary pollutant
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ions in polar solvents quick check why is water considered the universa…
Water dissolves more substances than any other solvent
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after which action would the concentration of a solution remain constan…
removing solution from the container
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solutes and solvents which statement is the best explanation for the gr…
B. As temperature rises, gas particles are moving faster and may leave the solution
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which option is a microscopic property that helps determine whether or …
polarity
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write the correct name for each of these compounds: 12. fe(oh)₂ 13. (nh…
Let's solve the naming of these chemical compounds one by one (we'll do a few as examples, and you can follow the same rules for others): ### Compound 22: $\ce{Ag3PO4}$ # Explanat…
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write the correct name for each of these compounds: 12. fe(oh)₂ 13. (nh…
Iron(II) hydroxide ### 13. $\boldsymbol{\ce{(NH4)3PO4}}$
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write the correct name for each of these compounds: 12. fe(oh)₂ 13. (nh…
Iron(II) hydroxide ### Question 13: $\boldsymbol{(NH_4)_3PO_4}$
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covalent compounds name of covalent compound | formula of covalent comp…
To solve for the formulas and names of covalent compounds, we use the rules for naming covalent compounds (prefixes: mono-, di-, tri-, tetra-, penta-, etc., to indicate the number…
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binary ionic compounds name of ionic compound | formula of ionic compou…
To solve for the formulas of binary ionic compounds (and vice versa), we use the principle of charge balance: the total positive charge from cations equals the total negative char…
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which statement correctly compares the ph of water to that of other sub…
The option with the statement "The pH of water is neutral; it is higher than the pH of acids and lower than the pH of bases" (the second option in the list)
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practice word equations: name each of the compounds under the question.…
s: ### 1. Balanced Equation: \( \boldsymbol{2\text{NaCl}(\text{s}) + \text{F}_2(\text{g}) = 2\text{NaF}(\text{s}) + \text{Cl}_2(\text{g})} \) ### 2. Balanced Equation: \( \boldsym…
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14. ____ k + ____ mgbr → ____ kbr + ____ mg
The coefficients are \( \boldsymbol{1} \) (for K), \( \boldsymbol{1} \) (for MgBr), \( \boldsymbol{1} \) (for KBr), and \( \boldsymbol{1} \) (for Mg) (assuming \( \text{MgBr} \) i…
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9. \\underline{\\quad\\quad} fecl₃ + \\underline{\\quad\\quad} naoh \ i…
1, 3, 1, 3 ### Problem 10
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biomass energy can be a sustainable carbon - neutral source of energy. …
We burn it (combustion) or chemically convert it to biofuel.
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practice word equations: name each of the compounds under the question.…
2, 2, 3 ### Problem 5:
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11 classify the following ions as monatomic or polyatomic. a: cl⁻, b: c…
- A. \( \text{Cl}^- \): monatomic - B. \( \text{Ca}^{+2} \): monatomic - C. \( \text{CO}_3^{-2} \): polyatomic - D. \( \text{Al}^{+3} \): monatomic - E. \( \text{OH}^- \): polyato…
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10 the name for $h_2c_2o_4$ is
oxalic acid (or ethanedioic acid)
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9 the name for h₃n is
ammonia (or trihydrogen nitride)
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the formula for hydro selenic acid is
$\ce{H_2Se}$
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classify the following as ionic or covalent compounds. a \\(\\ce{p2o5}\…
To classify compounds as ionic or covalent, we use the following rules: - **Ionic compounds**: Form between a metal (or polyatomic cation) and a non - metal (or polyatomic anion),…
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6 the formula for lithium carbonate is
\( \text{Li}_2\text{CO}_3 \)
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comparing carbon accumulation in tilled and no - till agricultural soil…
s: 1. Native grassland: $396\ \text{g N m}^{-2}$, Tilled farmland: $312\ \text{g N m}^{-2}$, No - till farmland: $474\ \text{g N m}^{-2}$ 2. Tilled farmland: ~78.79%, No - till fa…
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the correct formula for iron ( ii) phosphide is
$\boldsymbol{Fe_3P_2}$
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the correct name for $mg(clo)_2$ is *** if a parentheses is needed, lea…
Magnesium hypochlorite
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24. give one example of a physical change. 25. give one example of a ch…
Melting ice (other examples like freezing water, dissolving sugar in water, breaking a glass are also valid) ### Question 25
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21. one example of a chemical change is ______ a. burning wood b. crush…
a. Burning wood ### Question 22
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the ions formed when $\\ce{ch_{3}oh}$ dissociates in water are
Methanol dissociates only very slightly in water, forming methoxide ions ($\text{CH}_3\text{O}^-$) and hydronium ions ($\text{H}_3\text{O}^+$) (or equivalently, hydrogen ions $\te…
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the table shows the number of students in each grade at prairie middle …
80
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ionic bonding - problems which of the following could form an ionic com…
A. $\text{Na}^+$ and $\text{F}^-$ C. $\text{Cl}^-$ and $\text{K}^+$
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the percent by mass of methanol (molar mass = 32.04 g/mol) in an aqueou…
$\approx 28.0\ \text{mol/kg}$
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the sentence below is a word equation that describes a chemical reactio…
The balanced chemical equation is $\boldsymbol{2Fe + N_2 = 2FeN}$
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potassium chloride and fluorine undergo a single replacement reaction. …
C. KF and \( \text{Cl}_2 \) (assuming the third option is labeled C, with the text "KF and \( \text{Cl}_2 \)")
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pper(ii) hydroxide and sodium phosphate undergo a double replacement re…
E. $\ce{Cu3(PO4)2}$ and $\ce{NaOH}$ (assuming the last option is E, as per the options: the last option is $\ce{Cu3(PO4)2}$ and $\ce{NaOH}$)
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ammonia (nh₃) decomposes into its elements. predict the formulae of the…
A. $\ce{N_2}$ and $\ce{H_2}$
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ammonia ($nh_3$) decomposes into its elements. predict the formulae of …
A. $\ce{N_2}$ and $\ce{H_2}$
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propane gas - $\\ce{c3h8}$ - undergoes combustion. predict the formulae…
C. \( \text{CO}_2 \) and \( \text{H}_2\text{O} \)
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potassium iodide and lead(ii) nitrate undergo a double replacement reac…
C. \(KNO_3\) and \(PbI_2\)
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aluminum and copper(i) chloride undergoes a single replacement reaction…
E. Cu and $AlCl_{3}$
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draw the lewis dot structure for the following: sih₄\thcl mgcl₂\tal₂o₃ …
### 1. $\boldsymbol{\ce{SiH4}}$ #### Step 1: Determine valence electrons Si (Group 14) has 4 valence electrons; each H (Group 1) has 1, so total: $4 + 4(1) = 8$. #### Step 2: Arra…
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ionic vs. covalent review properties\tionic\tcovalent made with: electr…
To complete the "Ionic vs. Covalent Review" table, we analyze each property: ### 1. **Made with:** - **Ionic:** Metal + Non - metal (or polyatomic ion). Ionic bonds form between a…
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name date: per more lewis structure practice!!! formula name before aft…
To determine the correct Lewis structures or complete the table, we analyze each compound: ### 1. \( \boldsymbol{CS_2} \) (Carbon disulfide) - **Valence electrons**: \( C \) (4) +…
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name maddu beckman date: 1/... per __ more lewis structure practice!!! …
To determine the missing names and complete Lewis structures, we analyze each compound: ### 1. $\boldsymbol{H_2O}$ (Water) - **Name**: Water (common name) or Dihydrogen monoxide (…
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chemistry: ionic (binary, polyatomic, transition metals) and covalent f…
Formula: \(NaOH\), Molar Mass: \(40.00\) g/mol ### Problem 2: Tetraphosphorus Decoxide
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#6-10: write the formulas, predict and balance the equation 6. zinc + c…
s: 6. $\boldsymbol{\text{Zn} + \text{CaSO}_4 ightarrow\text{No Reaction}}$ 7. $\boldsymbol{\text{KNO}_3+\text{Al(ClO}_3\text{)}_3 ightarrow\text{No Reaction}}$ 8. $\boldsymbol{2(\…
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ws 6.7 - chemistry problems #1-5: write the formulas and balance the eq…
\( 4P + 5O_2 ightarrow 2P_2O_5 \) ### Problem 2: Bromine Gas + Iron → Iron (III) Bromide
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3. rivers carry tons of tiny rock fragments called sediments into the o…
After a few million years, the sediments carried by rivers into the ocean will accumulate on the ocean floor. Over time, due to pressure from overlying layers and chemical cementa…
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multiple choice question when comparing two full 1 liter bottles of sol…
A. 5% glucose solution
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multiple choice question which of the following affect(s) the osmotic p…
B. The temperature of the solution, D. The number (concentration) of solute particles it contains
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multiple choice question imagine you have solute molecules at a very hi…
C. Solute molecules will spread out evenly reaching equilibrium.
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multiple choice question a concentration gradient exists in a solution …
not the same everywhere.
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multiple choice question two solutions are made by mixing sugar and eno…
The 10% sugar solution
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question 1 1 pts one molecule of oxygen gas contains: a nonpolar covale…
A. a nonpolar covalent bond
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multiple choice question the difference between the structure of satura…
D. saturated fats contain single bonds only between their carbon atoms (Note: Assuming the options are labeled A, B, C, D with the last option being D. If the original labeling wa…
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extension: volume and density get the gizmo ready: - press chill until …
1. A. Float 1. B. Rise 1. C. Densest: Liquid water; Least dense: Water vapor 2. A. No, liquid water takes up less space 2. B. Water vapor 2. C. Densest: Liquid water; Least dense:…
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5 multiple answer 1 point which of the following might an academic work…
- Examining how Paleolithic people used the natural texture of caves as a foundation for their cave paintings to understand their painting process and the role the images may have…
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activity b: comparing phases get the gizmo ready: - click chill until t…
1. A. Solid (ice) B. Liquid (water) and Gas (water vapor) 2. | Solid | Liquid | Gas | |-------|--------|-----| | Tightly packed, ordered lattice of molecules (e.g., small circles …
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2. a phase is a state of matter, such as a solid, a liquid, or a gas. w…
2. (Corrected): You can see solid (ice) and liquid (liquid water, condensed water droplets); water vapor (gas) is invisible. 3. Melting (solid to liquid), vaporization/boiling (li…
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but house or hald, to thole the winter’s sleety dribble, an’ cranreuch …
The poet's comparison of mice and humans in the final two stanzas shows that mice live only in the present, while humans (the speaker) are burdened by reflecting on the past and f…