Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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the combustion of 4.00 grams of milk in a bomb calorimeter resulted in …
\(-842.8\)
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write equations from verbal descriptions 1. (model with mathematics) th…
s: 2. Equation: \( \boldsymbol{c = 2.54i} \), Height in centimeters: \( \boldsymbol{81.28} \) 3. Equation: \( \boldsymbol{y = 3x} \) (or \( \boldsymbol{126=3x} \)) 4. Equation: \(…
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use the drop - down menus to mark the rhyme scheme of the poem. the boy…
For the second line (To fetch the daffodils away), the answer is "a". For the third line (And home at noonday from the hills), the answer is "b". For the fourth line (They bring n…
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calculate the enthalpy, in kj/mol, for the combustion of the hydrocarbo…
\(-3220\) (or \(-3.22\times 10^{3}\), but as per the question, in decimal form with three significant figures, it's \(-3220\) or \(-3.22\times 10^{3}\), but the question says "giv…
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0.235 g of a hydrocarbon reacts with excess oxygen in a bomb calorimete…
\(\frac{0.235}{122.118}\) (or approximately \(0.001924\) but as per instruction not to round, we keep the fraction form or the decimal as is from the division)
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a hydrocarbon reacts with oxygen in a bomb calorimeter containing 2.00 …
+6197.044
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hcl + naoh → nacl + h₂o 25.0 ml of 1.00 m hcl is added to 75.0 ml of 1.…
\(0.025\)
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hcl + naoh → nacl + h₂o 25.0 ml of 1.00 m hcl is added to 75.0 ml of 1.…
\(-3710\) (or more precisely \(-3705.66\), depending on rounding. If we use the given values strictly: \(102\times4.20\times8.65 = 102\times36.33 = 3705.66\), so \(-3706\) or \(-3…
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hcl + naoh → nacl + h₂o 25.0 ml of 1.00 m hcl is added to 75.0 ml of 1.…
102
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part d te express your answer in condensed form in order of increasing …
Ti: $\text{[Ar]}4s^23d^2$ Te: $\text{[Kr]}5s^24d^{10}5p^4$
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2naoh + h₂so₄ → 2h₂o + na₂so₄ 50.0 ml of 0.50 m h₂so₄ is added to 60.0 …
\( 0.024 \)
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2naoh + h₂so₄ → 2h₂o + na₂so₄ 50.0 ml of 0.50 m h₂so₄ is added to 60.0 …
\(-580\) (or more precisely \(-579.96\))
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part c ti express your answer in condensed form in order of increasing …
Part C: $[Kr]4s^23d^2$ Part D: $[Xe]5s^24d^{10}5p^4$
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2naoh + h₂so₄ → 2h₂o + na₂so₄ 50.0 ml of 0.50 m h₂so₄ is added to 60.0 …
\(115.5\)
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express your answer in condensed form in order of increasing orbital en…
Sr: $\boldsymbol{[Kr]5s^2}$ Y: $\boldsymbol{[Kr]5s^24d^1}$
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the heat of reaction (qₓₙ) is determined to be +6,760 j when 0.255 mol …
-6,760 J
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part c pb express your answer in condensed form in order of increasing …
Part C: $[Xe]6s^24f^{14}5d^{10}6p^2$ Part D: $[Kr]5s^24d^{10}$
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part a se express your answer in condensed form in order of increasing …
Part A: $[Ar]4s^23d^{10}4p^4$ Part B: $[Kr]5s^24d^{10}5p^2$
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the heat of reaction (qₓₙ) is determined to be -225 j when 0.10 mol of …
+2250 J
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6,340 joules of energy were absorbed by the 245.0 g piece of lithium wh…
The initial temperature of the lithium is approximately \(\boxed{44.8}\) °C (or 44.75 °C, depending on rounding).
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a 245.0 g sample of lithium was placed in a calorimeter containing 45.0…
\(-127\) (or \(-1.27\times 10^{2}\))
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part e write full electron configurations for cl. express your answer i…
Part E: $1s^22s^22p^63s^23p^5$ Part G: $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^2$
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a 245.0 g sample of lithium was placed in a calorimeter containing 45.0…
\(-6213.24\)
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the water absorbs about 2120 j and the calorimeter absorbs about 22 j. …
\(-2142\)
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write full electron configurations for kr express your answer in comple…
Kr: $1s^22s^22p^63s^23p^64s^23d^{10}4p^6$ (formatted as string: `1s^22s^22p^63s^23p^64s^23d^104p^6`) Ge: $1s^22s^22p^63s^23p^64s^23d^{10}4p^2$ (formatted as string: `1s^22s^22p^63…
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part a which property increases as you move from left to right across a…
ionization energy
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which details from \chicago\ by carl sandburg reflect characteristics o…
- Sandburg captures the essence of city life through the diverse images of Chicago’s residents. - The poem challenges rules about point of view, rhyme scheme, and meter.
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cs express your answer in condensed form in order of increasing orbital…
[Xe]6s^1
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you decide to use aluminum \ice cubes\ to cool your juice. what is the …
-15,000 J
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part b ni express your answer in condensed form in order of increasing …
[Ar]4s^23d^8
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part a tl express your answer in condensed form in order of increasing …
[Xe]6s^24f^145d^106p^1
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container a and b are closed systems. what will happen to the speed of …
The molecules in container A will speed up and those in B will slow down.
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what is the energy change for the reaction when 1.48 g o₃ reacts with e…
-6.14 kJ (corresponding to the option: -6.14 kJ)
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express your answer in condensed form in order of increasing orbital en…
[Ar]4s^23d^8
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the formation of propane from its elements is an exothermic reaction wi…
3C(s) + 4H₂(g) → C₃H₈(g) ΔH = +103.85 kJ
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arrange the following elements in order of decreasing metallic characte…
Strongest: Sr → Ga → Al → Si → P → Weakest: N
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you injure your ankle playing your favorite sport. your coach grabs a d…
B. The pack is endothermic, absorbing heat from your ankle.
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arrange the following elements in order of decreasing atomic size. rank…
Largest atomic size: Rb Ca Ge Si S Smallest atomic size: F
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choose the element with the larger atoms from each of the following pai…
Between Sn and Si, the element with the larger atoms is Sn Between Br and Ga, the element with the larger atoms is Ga Between Sn and Bi, the element with the larger atoms is unabl…
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choose the element with the larger atoms from each of the following pai…
Between Sn and Si, the element with the larger atoms is Sn Between Br and Ga, the element with the larger atoms is Ga Between Sn and Bi, the element with the larger atoms is Bi Be…
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rank values from highest to lowest ionization energy. to rank items as …
Highest to lowest: 1. Cl 2. S 3. Te 4. Sn 5. Pb
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arrange the following elements in order of decreasing ionization energy…
highest: Cl 1. S 2. Te 3. Pb 4. Sn (lowest)
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arrange the following elements in order of decreasing metallic characte…
Most metallic character → Cs, Ca, Cr, Zn, P, S, F → Least metallic character
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view available hint(s) reset help silver phosphorus germanium strontium…
Highest ionization energy: phosphorus : germanium : silver : molybdenum Lowest ionization energy: strontium
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an atoms size is determined by how far the outermost electrons are from…
Largest atom: Rb, Ge, Se, Br, Smallest atom: Kr
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part c p - 32 express your answer as an isotope. ☑️a chemical reaction …
Part C: $\boldsymbol{\ce{^{32}_{15}P}}$ Part D: $\boldsymbol{\ce{^{144}_{54}Xe}}$
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the sodium isotope with 12 neutrons express your answer as an isotope. …
1. $^{23}_{11}\text{Na}$ 2. $^{27}_{13}\text{Al}$
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the oxygen isotope with 8 neutrons express your answer as an isotope. a…
$^{16}_{8}\text{O}$ $^{19}_{9}\text{F}$
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atomic number for the lead isotope with 124 neutrons express your answe…
atomic number = 82 mass number = 206
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atomic number for the helium isotope with 1 neutrons express your answe…
Atomic number = 2 Mass number = 3
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atomic number for the chromium isotope with 30 neutrons express your an…
atomic number = 24 mass number = 54
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part a atomic number for the titanium isotope with 24 neutrons express …
Part A: 22 Part B: 46
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mg express your answer as an ion. ☑a chemical reaction does not occur f…
$\text{Mg}^{2+}$ $\text{Na}^{+}$
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f express your answer as an ion. □a chemical reaction does not occur fo…
Part F: $\text{F}^-$ Part B: $\text{N}^{3-}$
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what is the symbol of an ion with 31 protons, 40 neutrons, and 28 elect…
\(\ce{^{71}_{31}Ga^{3+}}\) ### Second Sub - Question
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i⁻ enter your answers as integers separated by a comma. #p⁺, #e⁻ = subm…
For $\text{I}^-$: 53, 54 For $\text{Ag}^+$: 47, 46
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ga³⁺ enter your answers as integers separated by a comma. #p⁺, #e⁻ = su…
For $\text{Ga}^{3+}$: 31, 28 For $\text{Se}^{2-}$: 34, 36
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nitrogen ion with 10 electrons express your answer as a signed integer.…
Part C: $3-$ Part D: $4-$
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rhenium ion with 68 electrons express your answer as a signed integer. …
7+ 1+
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3. isotopes vs. atomic mass a. define isotope in your own words. b. exp…
a. Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons (different mass numbers). b. Atomic mass is a weighted average of an el…
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why do you expect the pair of elements li and na to be most similar? ma…
Li and Na are elements of the same **group**, therefore, they have the same **valence electrons**, which determine similar **chemical** properties.
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missed this? watch kcv: the periodic law and the periodic table; read s…
Mo
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name:_______________________________ per:________ date:________________…
positive ### Question 2
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classify each element as a halogen, a noble gas, or neither. drag the a…
Halogen: Br, I Noble gas: Xe, Ne Neither: S
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part a which elements are alkali metals? check all that apply: iron lit…
- lithium - potassium
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which elements would you expect to gain electrons in chemical changes? …
Would expect to gain electrons: - nitrogen - iodine Wouldn't expect to gain electrons: - tungsten - strontium - gold
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chapter 4 and 9 homework exercise 4.52 - enhanced - with feedback s ca …
Metal: Ca Nonmetal: S, N Metalloid: As, Te
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each element as a metal, nonmetal, or metalloid appropriate items to th…
- Metal: Ca - Nonmetal: N - Metalloid: B, Te, As
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sn express your answer as an integer. z = submit request answer part b …
Part A (Sn): $50$ Part B (Mo): $42$
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learning goal: to understand the relationship between atomic number and…
269
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practice it! which of the following is a potential environmental conseq…
Sediments are unable to reach the end of the river.
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what did you figure out? chemical energy and waves describe in your own…
1. Chemical energy is stored in molecular bonds and released during reactions (e.g., burning fuel or digesting food) to perform work. 2. Transverse waves (e.g., light, water waves…
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practice it! select the statement that does not explain how crude oil a…
Both have biogenic sources.
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chlorine-35 has 17 protons. how many protons and neutrons does the isot…
17 protons and 19 neutrons
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understand: collision theory google classroom microsoft teams according…
B. The reactants must collide with enough energy to break bonds. C. The reactants must be in a specific orientation.
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understand: collision theory the most common chemical reactions have tw…
C. It's more probable for two molecules to collide in the correct orientation than three or more molecules.
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complete the table to compare the properties associated with acidic and…
pH (Acidic): less than 7 pH (Basic): greater than 7 Conductivity (Acidic): conducts electricity Conductivity (Basic): conducts electricity Effect on litmus paper (Acidic): turns b…
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select the correct answer. what defines the mass number of an isotope? …
A. the sum of the neutrons and protons
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sports drinks contain useful electrolytes which of the following statem…
B. Strong electrolytes completely dissociate into ions in solution, resulting in high conductivity.
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you might need: periodic table move the cards to match the name with th…
HCl \> hydrochloric acid HClO₄ \> perchloric acid H₂SO₄ \> sulfuric acid H₂S \> hydrosulfuric acid HNO₃ \> nitric acid HNO₂ \> nitrous acid
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match the number of neutrons to the isotope. drag the items on the left…
- $_4^9\text{Be}$ → 5 - $_9^{19}\text{F}$ → 10 - $_{10}^{20}\text{Ne}$ → 10 - $_8^{16}\text{O}$ → 8 - $_3^7\text{Li}$ → 4
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apply: naming acids and bases google classroom microsoft teams you migh…
ammonium hydroxide: $\text{NH}_4\text{OH}$ (or $\text{NH}_3\cdot\text{H}_2\text{O}$) hydrochloric acid: $\text{HCl}$ acetic acid: $\text{CH}_3\text{COOH}$ (or $\text{C}_2\text{H}_…
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apply: naming acids and bases google classroom microsoft teams you migh…
$\text{HBr}$ \> hydrobromic acid $\text{HClO}_3$ \> chloric acid $\text{H}_2\text{SO}_4$ \> sulfuric acid $\text{H}_2\text{S}$ \> hydrosulfuric acid $\text{HNO}_3$ \> nitric acid …
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consider the elements in this family (group) of the periodic table. bec…
B. They are chemically reactive in a similar way.
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water is made from the elements hydrogen and oxygen. both are gases, bu…
C. A limited number of elements can combine in many ways to form all materials.
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the following model depicts two solutions containing two different acid…
Solution A is a strong acid. The acid molecules completely dissociate meaning it has a high concentration of $\text{H}^+$ ions. Solution B is a weak acid. The acid molecules parti…
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complete the table to compare the properties associated with acidic and…
pH (Acidic solutions): less than 7 pH (Basic solutions): greater than 7 Ions produced in solution (Acidic solutions): produce $\text{H}^+$ (or hydronium $\text{H}_3\text{O}^+$) io…
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quiz 1 google classroom microsoft teams complete the statements. - in a…
- In an aqueous solution, the $\boldsymbol{\text{solute}}$ is a solid, liquid, or gas that is evenly dispersed in the $\boldsymbol{\text{solvent}}$, which is always water. - A $\b…
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naphthalene methyl acetate molecular structure polar or nonpolar has ch…
To solve this, we analyze the properties of naphthalene and methyl acetate: ### Step 1: Recall Solubility Principles Water is polar ($\ce{H2O}$ has a bent structure, polar bonds, …
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a solution is a type of mixture. in a solution everything is evenly spr…
A. sugar water
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which statement best describes all matter on earth? a all matter on ear…
C. All matter is made from a limited number of elements that form compounds.
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specific heat capacity of water this problem requires multiple steps. c…
To solve the problem of calculating the thermal energy gained by water, we use the formula for heat transfer: \[ q = mc\Delta T \] where: - \( q \) = heat energy (J) - \( m \) = m…
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why does the smaller piece of butter melt more quickly? choose 1 answer…
C. Both pieces of butter have the same specific heat capacity, but there are fewer molecules in the smaller piece. Less thermal energy is required to raise their average kinetic e…
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what is the effect of the biogeochemical cycles? cycling energy through…
B. recycling matter through the biosphere
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choose 1 answer a 1,421.2 j b 1,776.5 j c 20,565.6 j d 62,867.2 j check…
\( 0.385 \)
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what is the primary reason the larger pot takes longer to boil? choose …
A. The water in both pots has the same specific heat capacity, but there are more water molecules in the larger pot. More thermal energy is required to raise their average kinetic…
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what is mary shelley casting blame on for victor’s negative choices (or…
Victor is primarily responsible for his own negative outcomes due to his selfish, unethical choices, rather than being a victim of circumstance. Two key quotes support this: 1. Hi…
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directions: label all your answers. 1) during transmutation (radioactiv…
1) 100 2) PARENT 3) STABLE; UNSTABLE 4) 6 hrs 5) 12.5 6) 87.5 7) 30 days; 75 days 8) 3.125 9) 6 m.y. 10) Parent %=25; Daughter %=75
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ure and electrostatic potential map london dispersion present? dipole-d…
methanol (CH₃OH): London dispersion present? Yes; Dipole-dipole present? Yes methane (CH₄): London dispersion present? Yes; Dipole-dipole present? No formaldehyde (CH₂O): London d…
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complete the table to describe polar and nonpolar molecules. then, answ…
A. polar Nonpolar: Individual bond dipoles cancel out; Charge distribution is symmetric Polar: Individual bond dipoles do not cancel out; Charge distribution is asymmetric