化学
化学反应、化学计量、分子结构与元素性质。
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question 3 of 10 which of the following elements is the least reactive …
B. Magnesium (Mg)
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question 2 of 10 which of the following elements is the smallest? a. be…
A. Beryllium (Be)
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question 1 of 10 what trend is seen in atom size, going down the period…
B. Atomic radius gets bigger the lower an atom appears on the periodic table.
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question 9 of 10 which of the following notations is the correct noble …
A. $[He]2s^1$
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question 8 of 10 what does the period number tell about the energy leve…
C. The period number tells which is the highest energy level occupied by the electrons.
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question 7 of 10 what is the correct electron configuration of phosphor…
C. \(1s^22s^22p^63s^23p^3\)
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question 6 of 10 what is the maximum number of electrons that can occup…
B. 2
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question 5 of 10 what property of an element does the group number iden…
B. The number of valence electrons
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question 4 of 10 when do d orbitals start getting filled? a. after the …
D. After the s orbital of the next highest energy level
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question 3 of 10 how many total orbitals are within the 3s, 3p, and 3d …
D. 9
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question 2 of 10 which of the following elements has 2 electrons in the…
B. Ca
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question 25 of 25 rubidium (rb) has an atomic number of 37. it can lose…
D. 1+
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question 24 of 25 which element is in the alkali metal family? a. lithi…
A. Lithium (Li)
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question 22 of 25 what are the alkali metals? a. elements with eight va…
D. The first group on the periodic table
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what did john dalton contribute to the understanding of the atom? a. an…
B. An early form of the atomic theory
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hands moving on a battery - operated clock is an example of what kind o…
D. Chemical potential energy being converted to kinetic energy
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question 17 of 25 which sentence describes all atoms of one element? a.…
D. They have the same number of protons.
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question 15 of 25 what determines an elements properties? a. the core e…
B. The valence electrons
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question 14 of 25 what did dmitri mendeleev contribute to science? a. h…
D. He arranged the first periodic table.
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question 12 of 25 what is the atomic number of arsenic (as)? a. 15 b. 3…
B. 33
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question 10 of 25 which element would be the least similar to magnesium…
A. Na
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question 9 of 25 thermal windows often have all the air pumped out betw…
C. Ar
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question 8 of 25 which family contains elements with a full octet of va…
C. The noble gases
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how were the elements in the first periodic table arranged? a. in order…
A. In order of atomic mass
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question 4 of 25 which option describes a phase change? a. air leaking …
B. Gasoline evaporating into the air
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question 3 of 25 an atom of copper (cu) has a mass number of 63 and an …
A. 29
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what is another name for group 14? a. group 14a b. group 4a c. group 4b…
B. Group 4A
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read this stanza from allen ginsbergs \a supermarket in california.\ wh…
The long-line structure imitates stream-of-conscious thought.
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read the descriptions of rhyme schemes below. free verse: poetry that d…
free verse
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medición de la acidez el ph de una solución es una medida de la cantida…
# Explicación: ## Paso 1: Aplicar fórmula de pH La fórmula del pH es $\text{pH} = -\log_{10} [\text{H}^+]$ ## Paso 2: Calcular pH del limpiador de hornos Sustituir $[\text{H}^+] =…
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the average volume was 24.94 ml and the range was 1.42 ml. the accepted…
1. accurate and precise
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fill in the blank 2 points balance the following equation: 3 sio₂ + 2 h…
The coefficient for HF should be 4, so the filled blank for HF is 4. The balanced equation (with the given partial coefficients adjusted) would be \( 3\text{SiO}_2 + 12\text{HF} i…
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fill in the blank 2 points balance the following equation: 1 al + 2 o₂ …
First blank (Al): 4 Second blank (O₂): 3 Third blank (Al₂O₃): 2 (But let's check the problem's blank positions. The first blank is before Al, second before O₂, third before Al₂O₃.…
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when placed into water, which formula represents phosphoric acid? hpo h…
D. \( \text{H}_3\text{PO}_4 \)
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many transition metals have a roman numeral in their name. what is its …
B. It provides the charge of the cation.
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question 25 (1 point) what is the single oxidation number of aluminum i…
0 (corresponding to the option "0")
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what is the calibration of this beaker? 1 milliliter 50 milliliters 5 m…
D. 20 milliliters
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fill in the blank 2 points balance the following equation: 3 li + 1 alc…
The balanced equation is \(3Li + 1AlCl_3 ightarrow 3LiCl + 1Al\) (or in the format of the blanks: for \(Li\): 3, for \(AlCl_3\): 1, for \(LiCl\): 3, for \(Al\): 1). But looking at…
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fill in the blank 2 points balance the following equation: 1 li+ 1 alcl…
The balanced equation is $ \boldsymbol{3}\text{Li} + \text{AlCl}_3 = 3\text{LiCl} + \text{Al} $, so the coefficients (for the blanks in order: Li, Al, LiCl) should be 3, 1, 3. But…
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discovered in modern times. use the data in the table to complete the l…
The completed line graph has the following points plotted and connected: - (1805, 20) - (1855, 40) - (1905, 60) - (1955, 80)
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question 18 (1 point) which of the following represents an oxidation ha…
\(\boldsymbol{\ce{S(s) \to SO_{2}(g)}}\) (the option with this reaction)
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question 18 (1 point) which of the following represents an oxidation ha…
$\boldsymbol{\ce{S(s) -> SO_{2}(g)}}$ (the last option: S(s) → SO₂(g))
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question 17 (1 point) how many electrons must be added to the half-reac…
2 on the right side
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question 16 (1 point) how many hydrogen ions must be added to the half …
2 on the right side
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question 15 (1 point) how many water molecules must be added to the hal…
1 on the left side
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question 14 (1 point) what is the correct balanced redox reaction for $…
\( 3\text{Zn}^{2+}(aq) + 2\text{Al}(s) ightarrow 3\text{Zn}(s) + 2\text{Al}^{3+}(aq) \) (the last option: \( 3\text{Zn}^{2+}(aq)+2\text{Al}(s) ightarrow 3\text{Zn}(s)+2\text{Al}^{…
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atomic structure worksheet 1. name the three particles of the atom and …
1. | Particle | Charge type | Charge | |----------|-------------|--------| | Proton | Positive | +1 | | Neutron | Neutral | 0 | | Electron | Negative | -1 | 2. positive; protons; …
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question 13 (1 point) what is the correct balanced redox reaction for $…
\( \boldsymbol{\text{Al}^{3+}(\text{aq}) + 3\text{Ag}(\text{s}) ightarrow \text{Al}(\text{s}) + 3\text{Ag}^+(\text{aq})} \) (the first option: \( \text{Al}^{3+}(\text{aq})+3\text{…
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question 12 (1 point) in the reaction $ce{fe(s) + o_{2}(g) -> fe_{2}o_{…
A. iron
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question 11 (1 point) in the reaction $ce{fe(s) + o_{2}(g) -> fe_{2}o_{…
B. oxygen
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question 10 (1 point) in the reaction $\\ce{pb(no_{3})_{2}(aq) + cacl_{…
no element loses electrons
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question 9 (1 point) in the reaction $\\ce{pb(no_{3})_{2}(aq) + cacl_{2…
no element gains electrons
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question 8 (1 point) in the reaction: $\\ce{kno_{3}(aq) + pbso_{4}(aq) …
there is no reducing agent
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question 7 (1 point) in the reaction: $ce{kno_{3}(aq) + pbso_{4}(aq) ->…
there is no oxidizing agent
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question 6 (1 point) in the reaction: $\\ce{al}(s) + \\ce{o_2}(g) \ igh…
B. oxygen gains 2 electrons
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question 5 (1 point) in the reaction: $ce{al}(s) + ce{o_2}(g) \ ightarr…
C. aluminum loses 3 electrons (assuming the options are labeled as A to E with C being "aluminum loses 3 electrons")
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question 4 (1 point) identify the spectator ion in the reaction: $\\ce{…
\( \boldsymbol{\text{SO}_4^{2 -}(aq)} \) (the option corresponding to \( \text{SO}_4^{2 -}(aq) \))
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question 3 (1 point) identify the reducing agent in the reaction: $\\ce…
A. \( \text{Al}(s) \)
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question 2 (1 point) identify the oxidizing agent in the reaction: $ce{…
B. \( \text{O}_2(\text{g}) \)
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question 1 (1 point) what is the correct balanced net ionic equation fo…
\( \boldsymbol{\text{Fe}^{2+}(\text{aq}) + \text{Ni}(\text{s}) ightarrow \text{Fe}(\text{s}) + \text{Ni}^{2+}(\text{aq})} \) (corresponding to the option \( \text{Fe}^{2+}(\text{a…
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mama told me when i was young simple words are the truest of all she ta…
B. There is no rhyme scheme in this poem.
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by a. gautam my form is simply boring i want to be elastic— i hate to b…
C. There is not a fixed rhyme scheme in the second stanza.
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fe 8e, figure 2.10 atom of a non - metal element strong \electrostatic\…
- Espacio del ion sodio ($Na^+$): Positive ion formed: Cation / Atom of a metal element - Espacio de la unión iónica: Strong "electrostatic" attraction between ions / Electron tra…
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what happens as a substance moves from the gas to liquid to solid phase…
The molecules become more orderly
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the state of matter with the fastest moving molecules are solids. liqui…
gases.
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which terms describe this sample? image of particles at the bottom of a…
A. liquid element
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when placed into water, which formula represents hydrochloric acid?\ \\…
D. HCl
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when placed into water, which formula represents hydrochloric acid?\ \\…
D. HCl
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question 28 (1 point) saved what is the change in oxidation number of a…
there is no change in oxidation number for sulfur ### Question 29 (incomplete, but for the given part about oxidation number 0 to -3): When an element's oxidation number decreases…
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if an element goes from an oxidation number of 0 to an oxidation number…
A. an oxidizing agent
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question 38 (8 points) for the unbalanced redox reaction ki(aq) + h₂o(l…
s: - Coefficient of 3: 4. \(I_2(s)\) - Coefficient of 2: 3. \(MnO_4^-(aq)\) - Spectator ion: 6. \(K^+(aq)\) - Reducing agent: 1. \(I^-(aq)\) - Oxidizing agent: 3. \(MnO_4^-(aq)\) …
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question 37 (5 points) for the reaction no(g) + kmno₄(aq) → mno₂(s) + k…
To solve this, we analyze the oxidation states: ### Step 1: Determine Oxidation States - **N in NO**: Oxidation state of O is -2. Let N be \( x \): \( x + (-2) = 0 \) → \( x = +2 …
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question 37 (5 points) for the reaction no(g) + kmno₄(aq) → mno₂(s) + k…
To solve this redox reaction problem, we analyze the oxidation states of each element: ### Step 1: Determine oxidation states - For \( \text{NO}(g) \): \( \text{N} \) has an oxida…
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question 36 (6 points) match the following oxidation numbers for sulfur…
# Explanation: To determine the oxidation number of sulfur in each compound/ion, we use the rules for oxidation numbers (e.g., oxygen is usually -2, hydrogen is +1, the sum of oxi…
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question 35 (6 points) saved match the following definitions with the c…
- a material that does not lose or gain electrons: 3. spectator ion - the material that causes a gain of electrons: 5. oxidizing agent - a loss of electrons: 2. oxidation - the ma…
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tdsb.elearningontario.ca question 35 (6 points) match the following def…
- a material that does not lose or gain electrons: 3. spectator ion - the material that causes a gain of electrons: 5. oxidizing agent - a loss of electrons: 2. oxidation - the ma…
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question 33 (1 point) how many electrons are transferred in the followi…
10 ### Question 34
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question 27 (1 point) what is the change in oxidation number of an atom…
a increase of 2 ### Question 28
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unit 5 quiz #9 question 27 (1 point) what is the change in oxidation nu…
an decrease of 3 ### Question 28
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question 27 (1 point) what is the change in oxidation number of an atom…
a increase of 2 ### Question 28
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quiz #9 19 what is the single oxidation number of copper in cu₂o? ○ 0 ○…
+1 (corresponding to the option "+1") ### Question 27
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question 23 (1 point) which of the following represents a balanced half…
A. \(4H_2O(l) + MnO_4^-(aq) + 5e^- \to Mn^{2+}(aq) + 8OH^-(aq)\) (assuming the first option is labeled A, but in the image, the first option is the one with \(4H_2O\), \(MnO_4^-\)…
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question 21 (1 point) which of the following represents a balanced half…
\( 2H_2O(l) + S(s) \to SO_2(g) + 4H^+ + 4e^- \) (the second option) ### Question 22
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question 19 (1 point) which of the following represents a reduction hal…
(Question 19): \( \boldsymbol{\text{NO}_3^-(\text{aq}) \to \text{NO}(\text{g})} \)
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question 17 (1 point) how many electrons must be added to the half - re…
2 on the right side ### Question 18
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question 16 (1 point) how many hydrogen ions must be added to the half …
no hydrogen ions are needed ### Question 17
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how many hydrogen ions must be added to the half - reaction to balance …
s: - For the hydrogen ion balance question: 2 on the right side - For Question 17: 2 on the right side - For Question 18: $\ce{Fe^{2+}(aq) -> Fe^{3+}(aq)}$ (assuming the option is…
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9. jamie works at a company that makes cleaning chemicals. she is tryin…
(Note: The answer cannot be determined without the specific diagram content of the starting substances mentioned in the problem. However, based on the law of conservation of mass,…
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7. the diagram above shows the repeating groups of atoms that make up t…
c. The properties will likely be different because the repeating groups of atoms that make up the two samples have different numbers of atoms.
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question 14 (1 point) what is the correct balanced redox reaction for z…
\( 3Zn^{2+}(aq) + 2Al(s) ightarrow 3Zn(s) + 2Al^{3+}(aq) \) (the last option) ### Question 15
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6. santiago is a chemist working to make a new kind of antacid, which i…
d. Diagram D
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in the reaction fe(s) + o₂(g) → fe₂o₃(s) which element gains electrons …
B. oxygen ### Question 12 (Which element loses electrons in $\ce{Fe(s) + O_{2}(g) -> Fe_{2}O_{3}(s)}$)
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in the reaction: $kno_3(aq) + pbso_4(aq) \ ightarrow pb(no_3)_2(aq) + k…
s: - For the first reaction (reducing agent): there is no reducing agent - Question 9: no element gains electrons - Question 10: no element loses electrons
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in the reaction: al(s) + o₂(g) → al₂o₃(s), how many electrons does an a…
aluminum loses 3 electrons ### Question 6 (Oxygen electron change)
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question 3 (1 point) identify the reducing agent in the reaction: al(s)…
A. \( \text{Al}(s) \) ### Question 4
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what is the correct balanced net ionic equation for the reaction: fe(no…
(Question 1): $\boldsymbol{\ce{Fe^{2+}(aq) + Ni(s) -> Fe(s) + Ni^{2+}(aq)}}$ (the third option) ### Question 2: Oxidizing Agent
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passage 1 excerpt from society and solitude by ralph waldo emerson the …
Solitude is viewed as a source of strength.
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sulfuryl chloride is a substance used to make chemicals for killing ins…
4 molecules of sulfuryl chloride (\(SO_2Cl_2\)) react.
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nitrogen dioxide is a gas commonly found in polluted air. it is produce…
For the table: - N: 4 - O: 8 Number of \(NO_2\) molecules produced: 4
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according to the wave - mechanical model, in the ground state, the 10 e…
2. in orbitals