化學
化學反應、化學計量、分子結構與元素性質。
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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 …
Friendship is considered to be valuable but not necessarily vital
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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
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which ion in the ground state has the same electron configuration as an…
3. $F^-$
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as the atomic number increases in group 2 from be to ba, the first ioni…
2. decreases, and the atomic radius increases
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at stp, which property of tungsten remains the same for all samples of …
1. density
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diamond and graphite are two forms of solid carbon. these two forms of …
1. different crystal structures and different properties
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q2 chemistry: u4l11 covalent lewis dot diagram day 2 5. **nitrogen trii…
Covalent #### b. Formula:
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scientists sometimes want to show whether more energy is used or releas…
glucose + oxygen → carbon dioxide + water + energy
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in a chemical process, the atoms in the reactants are arranged differen…
First blank: broken Second blank: formed
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prepwork: covalent compounds name: for each molecule below, draw the le…
### 1. $\boldsymbol{CF_4}$ #### Lewis Dot Diagram: - Carbon (C) is central, has 4 valence electrons. - Four Fluorine (F) atoms, each with 7 valence electrons. - C forms 4 single b…
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37. \\( \\ce{h2s(g) + h2o2(aq) -> s8(s) + h2o(l)} \\) \\( \\ce{h2s(g) +…
The balanced chemical equation is \( \boldsymbol{\ce{8H2S(g) + 8H2O2(aq) -> S8(s) + 16H2O(l)}} \) (or can be simplified by dividing all coefficients by 8: \( \ce{H2S(g) + H2O2(aq)…
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look at the models and the table below. they show different chemical bo…
- the combination of atoms - the combination of bonds - the arrangement of atoms
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in a chemical process such as cellular respiration, the reactants and t…
| Chemical bonds | Glucose | Oxygen | Carbon dioxide | Water | |------------------------------------|---------|--------|----------------|-------| | a carbon atom connected to anot…
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for each of the following covalent compounds, provide the missing formu…
Name: dibromine monoxide Lewis Dot diagram: Br (:::Br) - O (::) - Br (:::Br) (where : represent lone pairs, and - is a single bond; each Br has 3 lone pairs (6 electrons) and O ha…
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for each of the following compounds, provide the missing formula or nam…
Name: dibromine monoxide Lewis Dot diagram: (O in center, single bonds to two Br atoms. Each Br has 3 lone pairs (6 electrons), O has 2 lone pairs (4 electrons)) ### Question 2
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2. balance the following redox reaction which takes place in a basic so…
# Explanation: ## Step1: Identify Oxidation and Reduction Half - Reactions - **Oxidation (Al to \(Al(OH)_4^-\))**: - The oxidation state of Al in \(Al(s)\) is 0, and in \(Al(OH)_4…
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5) kmno₄ 1×39.1 + 1×54.9 + 4×16.0 = 39.1 + 54.9 + 64.0 = 158.0 g/mol % …
H: \( \boldsymbol{2.74\%} \) Cl: \( \boldsymbol{97.26\%} \) ### Problem 7: NaNO₃
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fill in the missing information: | symbol | atom or ion? (check all tha…
- \( \text{B}^{2+} \): cation, protons = 5, electrons = 3 - Sn: neutral atom, protons = 50, electrons = 50 - Missing symbol: \( \text{Br}^- \), anion, protons = 35, electrons = 36
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complete each row of the table below by filling in the missing prefix o…
First row: prefix = n (nano), so 1 nmol = \(10^{-9}\) mol Second row: exponent = -3, so 1 mmol = \(10^{-3}\) mol Third row: exponent = -2, so 1 cmol = \(10^{-2}\) mol Fourth row: …
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count the significant digits in each of these measurements: measurement…
s: For \( 0.009700 \, \text{J} \): 4 For \( 4.0\times10^{-1}\, \text{mL} \): 2 For \( 37000. \, \text{kg} \): 5 For \( - 8.0\times10^{-1}\, \text{kJ/mol} \): 2
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complete the table below. for example, in the first row decide whether …
To solve this, we analyze each element: ### 1. Chlorine (Cl) - Chlorine is a non - metal. Non - metals generally gain electrons to achieve a stable electron configuration. When an…
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complete the table below. some binary molecular compounds name | chemic…
| Name | Chemical Formula | |---------------------|------------------| | sulfur monochloride | \( SCl \) | | pentasulfur dinitride | \( S_5N_2 \) | | sulfur tetrachloride | \( SCl…
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multiply or divide the following measurements. be sure each answer you …
\( \frac{\text{m}}{\text{s}} = 4.586 \) ### Second Calculation: \( \frac{20.947\ \text{mol}}{\text{L}} \times 50.\ \text{L} \)
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6. examine the number of electrons in the energy levels for each atom. …
- **Helium (He, \(Z = 2\))**: Energy level 1 (\(n = 1\)) has 2 electrons (matches \(2n^2\) for \(n = 1\)). Total electrons = 2 (equal to protons, \(Z = 2\)). - **Oxygen (O, \(Z = …
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q2 chemistry: u4l10 covalent lewis dot diagrams day 1 date: 9. which gr…
Group 1 (Hydrogen) and Group 17 (Halogens, e.g., F, Cl, Br, I) cannot form more than one bond (single bond) in covalent compounds. Because H needs 1 electron to complete its duet,…
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the correct name for kn is potassium nitrate true false
FALSE
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correctly name the compound $ba_3p_2$. a barium phosphide b tribarium d…
a. barium phosphide
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correctly name the compound $\\ce{rb_{2}o}$. a dirubidium oxygen b diru…
c. rubidium oxide
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which is the correct order for the names and formulas of binary ionic c…
d. metal cation followed by nonmetal anion
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which is the formula for a binary ionic compound composed of iodine and…
b. NaI
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what is the name of the compound formed from na⁺¹ and p⁻³? a sodium pho…
a. sodium phosphide
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what is the overall electrical charge for any compound? a positive only…
c. neutral or no charge only
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when writing the name or formula for an ionic compound, the order they …
a. metal cation first then non - metal anion
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what is the name of the binary ionic compound of calcium and sulfur? a …
a. calcium sulfide
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choose the name of a $mgcl_2$ compound. a caesium oxide b manganese iod…
d. Magnesium chloride
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review: ionic compounds & lewis diagrams for each of the element pairs,…
### Part 1: Ionic Compounds & Lewis Diagrams (Element Pairs) #### 1. Beryllium & Bromine **Step 1: Determine oxidation states** Beryllium (Be) is in Group 2, so it has a +2 oxidat…