Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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the equation for the decomposition of potassium chlorate is shown below…
A. \( 2 \text{KClO}_3(s) ightarrow 2 \text{KCl}(s) + 3 \text{O}_2(g) \) (assuming the full option A is this balanced equation)
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apply: balancing equations google classroom microsoft teams the followi…
$1\ \text{N}_2\text{H}_4(l) + 3\ \text{O}_2(g) ightarrow 2\ \text{NO}_2(g) + 2\ \text{H}_2\text{O}(g)$
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apply: counting atoms in chemical equations google classroom microsoft …
10
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apply: counting atoms in chemical equations google classroom microsoft …
5
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apply: counting atoms in chemical equations you might need: calculator …
12
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apply: counting atoms in chemical equations google classroom microsoft …
27
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you might need: calculator how many oxygen atoms are on the left side o…
8
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a polynomial with three terms is known as a ______. adding or subtracti…
1. trinomial 2. physics (or other valid STEM fields like chemistry; trinomial is fixed, second blank has common valid answers like physics) 3. degree (or "form", "structure"; degr…
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a student notices that the periodic table has most of the elements with…
D. Nonmetals tend to be gases or liquids at room temperature and are found on the right side of the table.
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hydrogen is in group 1a of the periodic table, known as the alkali meta…
A. Hydrogen has a similar electron configuration as alkali metals.
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using the periodic table, elaborate the difference between the number o…
D. The number of electrons are the same for all isotopes of an element - so both oxygen - 16 and oxygen - 18 contain 8 electrons.
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using the periodic table and your knowledge of atomic structure. compar…
A. Both have 6 electrons.
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what can you conclude about the classification of krypton? a krypton is…
B. Krypton is a noble gas and has a full valence electron shell, is chemically non - reactive, and located in group 8A.
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consider the element carbon. how many electrons can be found in a carbo…
B. 6; 4
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illustrated here are three different ______ of carbon. they vary by the…
D. Isotopes; neutrons
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______ are atoms with the same number of protons, but differing numbers…
C. Isotopes
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an atom either gains or loses ______ to become an ion. a electrons b ne…
A. electrons
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chlorine forms the chloride ion to bond with many metals. to become a c…
C. gain one electron.
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bromine, chlorine, and fluorine are examples of ______. a halogens b me…
A. halogens
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a group on the periodic table is best described as a _______. a column …
A. column
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lithium, sodium, and potassium are examples of ______. a non - metals b…
B. alkali metals
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the groups 1 and 2 on the periodic table contain what atom type? a meta…
A. metals
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metals vs. nonmetals physical properties sample a\tsample b\tsample c\t…
C. Sample C
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sodium has an atomic number of 11 and has a net charge of 0. when sodiu…
A. Sodium loses a negative electron when forming chemical bonds.
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an element from group 2 will form ionic bonds with a any other metal. b…
C. a nonmetal, Groups 13 - 17.
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which of these would best describe the structural difference between ma…
B. Magnesium has one less proton than aluminum.
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all the elements of a family in the periodic table have what feature in…
A. They all have similar chemical properties.
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the word family implies that the elements in a family have like propert…
A. They are not reactive.
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members of the alkaline earth elements have several things in common. t…
B. metals with two valence electrons.
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2. what is the % h in ca(c₂h₃o₂)₂? 3. what is the % ba in ba(no₃)₂?
2. The percentage of H in $\text{Ca(C}_2\text{H}_3\text{O}_2\text{)}_2$ is approximately 3.82% 3. The percentage of Ba in $\text{Ba(NO}_3\text{)}_2$ is approximately 52.55%
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4. what is the % of each element in ni₃(po₄)₂? 5. what is the % of each…
$\text{Ni}: 48.11\%$, $\text{P}: 16.92\%$, $\text{O}: 34.97\%$ --- ### Problem 5: $\text{Al}_2(\text{CrO}_4)_3$
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identify the properties of the compou particle arrangement and the stre…
To determine the bond types of \( \ce{H_2O} \), \( \ce{CO_2} \), and \( \ce{NaCl} \), we analyze each compound: ### 1. For \( \boldsymbol{\ce{H_2O}} \) (Water) - **Valence Electro…
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study guide – multiple choice 1. which of the following is an agent of …
C. Ice wedging ### Question 2
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why can you not hear sound in space? space is a mop and has no molecule…
Space is a vacuum and has no molecules.
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name: carla martinez valence electrons practice the valence electrons a…
Valence electrons are used for chemical bonding (to form compounds by transferring or sharing electrons to achieve a stable electron configuration like a noble gas). ### Question …
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what do patterns in a story include? a. unique character names b. repea…
1. b. Repeated ideas and conflicts 2. d. Deeper ideas or messages 3. a. Characters' actions and dialogue 4. b. A character's words or actions
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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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part b underline the valence electrons. - $1s^2 2s^2 2p^6 3s^2 3p^6 4s^…
A. $1s^22s^22p^63s^23p^64s^23d^{10}\underline{4p^6}$
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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…
Li and Na
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name:_______________________________ per:________ date:________________…
positive ### Question 2