化学
化学反应、化学计量、分子结构与元素性质。
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ionic bonding worksheets worksheet 1: introduction to ionic bonding nam…
### Worksheet 1: Introduction to Ionic Bonding 1. Ionic bonding is a chemical bond formed when electrons are transferred from a metal atom to a nonmetal atom, creating positively …
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5. choose the best answer. which of these is the correct lewis dot stru…
The first option (the leftmost structure with 7 dots around F: 3 pairs and 1 single dot)
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8. choose the best answer. what is the electron configuration for calci…
$\boldsymbol{1s^22s^22p^63s^23p^64s^2}$ (the third option)
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9. choose the best answer. what is the shorthand electron configuration…
9. [Xe] 6s²4f¹⁴5d¹⁰6p⁴ 10. 1s²2s²2p⁶3s²3p¹
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3. choose all that apply. which two sublevels does calcium have? d p s …
3. s, p 4. 4
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experiment & report 2 dimensional analysis chem 110 lab name (last) (fi…
$4.2\times10^{-6}\ L$ ### Problem 2: Convert 2.2 centimeters to millimeters
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1. choose the best answer. which element would be used for shorthand el…
1. [Ar] 2. 20
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francium is in period 7 and group 1 and has an atomic number of 87 and …
11. 1 12. 87 13. 7
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14. choose the best answer. which of these element groups always have t…
○ alkaline earth
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15. choose the best answer. which of these produce the most vibrant col…
15. alkali 16. transition
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18. choose the best answer. which of these element groups is the least …
1. group 2. transition
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19. choose the best answer. which of these element groups is most react…
19. A. alkali 20. 32
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part a: vocabulary (fill in the blank) 1. valence electrons are electro…
# Explicación: ## Parte A: Vocabulario (Rellenar los espacios) ## Paso 1: Definir electrones de valencia Los electrones de valencia se encuentran en el nivel de energía más extern…
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convert 136.71°f to kelvins. round your answer to the correct number of…
331.32
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question 2 (1 point) saved based on the graduated cylinder shown, what …
D) 5.7 mL
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11 fill in the blank 1 point balance the following chemical equation: t…
4, 5, 2
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9 fill in the blank 1 point balance the following chemical equation typ…
1, 3, 2, 3
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6 fill in the blank 1 point balance the following chemical equation: ty…
2 Na + 2 H₂O ---> 2 NaOH + 1 H₂
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a) cannot be determined b) 31.0 ml c) 18.0 ml d) 13.0 ml e) 1.03 g/ml f…
C) 18.0 mL
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4 multiple choice 1 point which of the following chemical equations is …
B. $2K + MgBr_2 ightarrow 2KBr + Mg$
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based on the graduated cylinder shown, what is the volume of the liquid…
D) 5.7 mL
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2 multiple choice 1 point which change is allowed when balancing a chem…
Changing coefficients in front of formulas
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question 1 (1 point) which one of the following substances will float i…
E. balsa wood (density = 0.16 g/mL)
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take a look at the periodic table square for zinc (zn): 5. what does th…
C. atomic number ### Question 6
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convert 522.1 k to degrees celsius. round your answer to the correct nu…
$249.0$
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types of reactions, balancing, and lcm quiz 1 fill in the blank 2 point…
2, 13, 10, 8
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convert 73.21°c to kelvins. round your answer to the correct number of …
346.4 (rounded to 4 significant figures, or 346.36 if strict precision is kept; the rounded value with correct sig figs is 346.4)
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4. which of the following is/are metalloid(s)? a. i and ii only b. i an…
A. I and II only
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3. (without a graphic organizer!) what is the percent by mass of oxygen…
Approximately 69.5%
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case english ii 50 yegor flew into a rage. \did you mean to make a fool…
A. Gerasim needs a job and asks the coachman Yegor for his assistance. ; E. Gerasim turns down the job Yegor helps him obtain after listening to the conversation between Polikarpy…
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part a what is the classification of a solution of naoh with a ph of 8.…
alkaline solution
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part a the ph scale ______. - is based on the salinity of a solution - …
is based on the concentration of hydrogen ions in a solution
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part a all salts are ionic compounds, but not all ionic compounds are s…
True
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molecular to empirical: for each of the following compounds, identify t…
2. Empirical Formula: $\text{N}_2\text{OH}_3$, Factor: 2 4. Empirical Formula: $\text{H}_6\text{O}_5$, Factor: 1 6. Empirical Formula: $\text{HP}_2$, Factor: 5
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which of the following is not a result of hydrogen bonds? view availabl…
Two hydrogen atoms join together to form a molecule of hydrogen gas.
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which of the following distinguishes hydrogen bonds from covalent bonds…
Only hydrogen bonds can form between molecules.
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multiple choice: identify the choice that best completes the statement …
1. d. Electrons are located outside a nucleus made of protons and neutrons. 2. b. 20 3. a. 20 4. b. 47 5. b. electrons 6. b. 75 neutrons 7. a. positive. 8. d. The mass of a neutro…
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question 4. the molar mass of zn(clo₄)₂ is ______. 164.84 g/mol. 260.55…
264.29 g/mol.
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question 3. the molar mass of a compound is expressed in .
grams per mole (or $\frac{\text{g}}{\text{mol}}$)
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question 2. which of the following represents the mass of one mole of w…
18.02 grams
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question 1. one mole of any substance contains particles, which is equa…
6.022 x 10²³
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directions: read the following poem, \grouped\ by ashley abrams. answer…
23. b. metaphor 24. b. frustrated to slightly hopeful 25. b. ABABCC 26. D. South Africa; Apartheid 27. A. The fact that he was the child of a black woman and a white man, which wa…
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12. which of the following best defines tone? a. the author’s attitude …
12. A. The author's attitude towards a subject 13. D. Third Person Omniscient 14. B. Second Person 15. A. First Person 16. B. Second Person 17. A. John was a kind and generous per…
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multiple-choice question nuclear energy is... energy stored in the bond…
B. use of nuclear reactions to produce electricity (suponiendo que la segunda opción sea la que dice esto, ya que la imagen muestra opciones y la correcta es la que refiere al uso…
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choose all that apply. chemical energy can be found in food burning woo…
- food - burning wood - photosynthesis
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multiple-choice question when a chemical reaction takes place, the stor…
released (la opción con el texto "released")
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multiple-choice question radiant energy is... energy that is transferre…
A. energy that is transferred by electromagnetic radiation, often referred to as light
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which of these uses logos? a. we are starving because the food, if you …
C. Yum Organics has been providing well-rounded organic lunches to schools on the West Coast for more than 15 years.
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1. what is the term that refers to the process of adding hydrogen to un…
1. D. hydrogenation 2. C. the process by which starch granules are cooked: they absorb moisture when placed in a liquid and heated 3. D. emulsify
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what is true of valence electrons? - they exist in the outer orbital. -…
A. They exist in the outer orbital.
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read the excerpt from act 1, scene 3, of julius caesar. cassius. and wh…
Cassius portrays Caesar as a cruel-hearted tyrant, and at the same time says he pities Caesar because Caesar can't help himself.
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match the items. biosphere atmosphere geosphere hydrosphere all of eart…
s: #### 1. Matching: - Biosphere: Includes the presence of living organisms of any type - Atmosphere: The envelope of gas surrounding the planet - Geosphere: Includes a hot and mo…
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a nurse is planning care for a client who is receiving chemotherapy and…
- Infuse the medication 30 min prior to chemotherapy. - Infuse the medication slowly over 15 min. - Repeat the dose 4 hr after chemotherapy.
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to determine the theoretical yield from a given chemical reaction, you …
The correct option is the one with "use the balanced chemical equation and g of a reactant to calculate the g of a product" (the fourth option in the list).
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____ is a technique to physically separate a heterogeneous mixture of a…
Filtration (the option with text "Filtration")
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in the stoichiometry lab, students performed a saponification lab using…
The ionic carboxylate end is soluble in nonpolar substances; whereas the long nonpolar hydrocarbon chain is soluble in water.
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what is the percent yield of the reaction 4 al + 3 o₂ → 2al₂o₃ if 2.8 g…
65% (Option: 65%)
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what is the theoretical yield of pi₃ if 32.0 g of i₂ are reacted with a…
34.6 g
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calculate the mass in grams of iodine (i₂) that will react completely w…
292
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calculate the mass of sodium chlorate that is used to form 7.5 g of oxy…
17
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silicon tetrachloride (sicl₄) can be prepared by heating si in chlorine…
1.45
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which of the following descriptions is least likely to describe the rea…
A. A saponification reaction is similar to a combination reaction because two smaller molecules are combined to form a much larger molecule.
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a student performed a chemical reaction in lab and obtained 2.5 g of pr…
77% (corresponding to the option with 77%)
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select the correct statement below regarding actual versus theoretical …
The correct statement is: "Theoretical yield is the amount of product predicted by the balanced chemical reaction when all of a reactant has reacted." (The second option in the li…
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calculate the mass of sodium chlorate that is used to form 6.5 g of oxy…
14
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question 5 of 8 (1 point) | question attempt: 1 of 1 stearin glycerol 3…
1:3 (the option with the blue dot, i.e., the selected option is 1:3)
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in the stoichometry lab, a saponification reaction is used to calculate…
\(1:3\)
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the chemical formula for hydrogen fluoride is hf. a chemist determined …
\(1.60\space g\) (or more precisely \(1.60064\space g\) which can be rounded to \(1.60\space g\) considering significant digits)
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the movie below shows some molecules in a tiny sample of a mixture of g…
Since the problem description is incomplete (it just shows a diagram of gas molecules and a key but no specific question), we can't provide a solution yet. Please provide the spec…
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two reactants + two reactants → one product + two products (diagrams of…
The left reaction (with reactants A and B forming product AB) is a synthesis (combination) reaction, where two reactants combine to form one product. The right reaction has two re…
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which of the following images represents a single - replacement reactio…
The reaction with reactants \(A\) and \(BC\) (the right - hand side reaction in the diagram) represents a single - replacement reaction.
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question: based on the videos, what is the best definition for stoichio…
The determination of the proportions in which elements or compounds react with one another.
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question: based on the videos, what is the best definition for stoichio…
The determination of the proportions in which elements or compounds react with one another.
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13. 76g 2ag₂o → 48g 4ag + ____o₂ 14. ____s₈ + 107g 12o₂ → 352g 8so₃ 15.…
13. $28\ \text{g}$ 14. $245\ \text{g}$ 15. $731\ \text{g}$ 16. $281\ \text{g}$ 17. $130\ \text{g}$ 18. $178\ \text{g}$ 19. $404\ \text{g}$ 20. $703\ \text{g}$ 21. $46\ \text{g}$ 2…
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should do: law of conservation of mass practice pg. 13 1. ____n₂ + 47g …
1. $\boldsymbol{16\ \text{g}}$ 2. $\boldsymbol{42\ \text{g}}$ 3. $\boldsymbol{61\ \text{g}}$ 4. $\boldsymbol{21\ \text{g}}$ 5. $\boldsymbol{1\ \text{g}}$ 6. $\boldsymbol{26\ \text…
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section 4: full balancing challenge (show mastery) this is where everyt…
1. $2\text{H}_2 + \text{O}_2 ightarrow 2\text{H}_2\text{O}$ 2. $\text{N}_2 + 3\text{H}_2 ightarrow 2\text{NH}_3$ 3. $2\text{Na} + 2\text{H}_2\text{O} ightarrow 2\text{NaOH} + \tex…
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ction 3: adding coefficients (fix it—the legal way) do not change subsc…
3. $2\text{H}_2 + 1\text{O}_2 ightarrow 2\text{H}_2\text{O}$ 4. $4\text{Al} + 3\text{O}_2 ightarrow 2\text{Al}_2\text{O}_3$ 5. $1\text{Ca} + 2\text{H}_2\text{O} ightarrow 1\text{C…
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4. gulli o‘simi lkl arn i ng hayot sikli modelini yasang: a) a3 o‘lcham…
To complete this task, follow these steps: 1. For part (a), draw a schematic of the flower life cycle including stages: seed → germination (seedling) → mature plant → flowering → …
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intermolecular forces: forces of polar bonds have a difference in elect…
1. Hydrogen Bonding blanks: partial positive of the **hydrogen (H)** is attracted to the partial negative of the **oxygen (O)** of a different water molecule 2. NaCl dissolving in…
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determine the value of $\\delta s_{sur}$ at 213 k, and predict whether …
$\Delta S_{surr} = -99.3\ \text{J/K·mol}$, nonspontaneous. (Corresponding to the option: $\boldsymbol{\Delta S_{surr} = -99.3\ \text{J/K·mol}, nonspontaneous}$)
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determine the value of $\\delta s_{sur}$ at 298 k, and predict whether …
$\Delta S_{sur} = -71.0\ \text{J/K·mol}$, nonspontaneous (the option corresponding to this is the last one with $\Delta S_{sur} = -71.0\ \text{J/K·mol}$, nonspontaneous)
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determine the value of $\\delta s_{sur}$ at 298 k, and predict whether …
$\Delta S_{\text{sur}} = -71.0\ \text{J/K·mol}$, nonspontaneous
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2.1.8 quiz: analyze themes in literature question 5 of 10 read these li…
A. abbcb
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3. use your graph to determine the % ethanol in your diluted unknown wi…
The % ethanol in the diluted unknown wine sample is approximately 11.4% (or $x \approx 0.114$ when expressed as a decimal proportion)
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describe the habitability of planets which statement accurately describ…
B. The terrestrial planets (except Earth) and the gas giants are not habitable.
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6. ions -1 nitrogen gain 3 electrons nitrogen # protons: ______ # proto…
### Left (Neutral Nitrogen): # Protons: 7 # Neutrons: 7 # Electrons: 7 Ion: Neutral (N) ### Right (Nitrogen Ion): # Protons: 7 # Neutrons: 7 # Electrons: 10 Ion: $\text{N}^{3-}$ (…
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7. ions -2 nitrogen lose 2 electrons nitrogen # protons: ______ # neutr…
### Left (Neutral Nitrogen): # Protons: 7 # Neutrons: 7 # Electrons: 7 Ion: Neutral (no charge, N) ### Right (Nitrogen Ion): # Protons: 7 # Neutrons: 7 # Electrons: 5 Ion: Nitroge…
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how do rock types contribute to the rate of weathering? ○ porous minera…
A. Porous minerals weather faster.
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john dalton’s theory described the atom as a. being like plum pudding b…
B. being solid and indivisible
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which set of coefficients correctly balances the following reaction? __…
B. 3, 8, 8
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iron (iii) oxide is the main source of iron for the steel industry and …
A. FeO and Fe₂O₃
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an individual cation from the iron (iii) oxide compound would contain _…
26 protons and 23 electrons
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use the following information to answer the next question phosphorus is…
Phosphorus has 5 valence electrons, and is found in group 15 (or 5) on the periodic table.
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use the following information to answer the next question 1. ductile 2.…
1, 4, 8
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use the following information to answer the next question the following…
chlorine: 4, scandium: 1, boron: 1, gold: 3
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use the following information to answer the next two questions the high…
C. 29 protons, 29 electrons, 35 neutrons
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in which reaction does a precipitate form? a. agno₃(aq) + nh₄no₃(aq) → …
B. $\text{Fe(NO}_3\text{)}_2\text{(aq)} + \text{Na}_2\text{S(aq)} ightarrow$
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if a calcium atom were to lose electrons and become a cation, it would …
20 protons and 18 electrons
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decide what kind of crystalline solid each element or compound in the t…
### For $\boldsymbol{\ce{H2O}}$: #### Step 1: Determine the type of solid $\ce{H2O}$ is a covalent compound composed of molecules (each $\ce{H2O}$ is a molecule), so it forms a **…
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water is a polar molecule. what does this mean in terms of the structur…
- the two sides of water have different charges - it can form hydrogen bonds with other molecules including itself - oxygen has a higher electronegativity than the hydrogen atoms …