Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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5 when we acted out ion formation, did you gain or lose electrons? why?
If representing a metal atom (e.g., sodium, magnesium), electrons are lost. This is because metal atoms have 1 - 3 valence electrons, and losing these electrons allows them to ach…
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5. the mass number is used to calculate the number of _________________…
The mass number is used to calculate the number of \underline{nucleons (protons + neutrons)} in one atom of an element. In order to calculate the number of neutrons you must subtr…
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4. the __________________________ of an element is the total number of …
The first blank: mass number; The second blank: nucleus
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3. the atomic number tells you the number of _________________ in one a…
First blank: protons Second blank: electrons Third blank: same
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2. the number of protons in one atom of an element determines the atom’…
The number of protons in one atom of an element determines the atom’s **atomic number**, and the number of electrons determines the **chemical properties (or charge, for ions)** o…
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in \i, too,\ how does the speaker respond to racial exclusion? with sha…
1. With hope and quiet resistance 2. The short, direct lines reflect the speaker's strength and clarity
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which process shows weathering? wear on the earths surface through a va…
wear on the Earth's surface through a variety of forces, such as movement of water
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question 4 1 pts (c.6b) which pair below describes isotopes of the same…
an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons
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(c.6b) neils bohr published his model of the atomic structure in 1913. …
the number of electrons in the outer shell.
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(c.6d) relative abundance and atomic mass of the naturally occurring is…
179 amu (corresponding to the option: 179 amu)
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which model correctly represents dissolved nabr?
text{Br}^- \) has white (H) around it? Wait the top-right’s \( \text{Br}^- \) (green) has red (O) and white (H) with H facing \( \text{Br}^- \)? Let me look at the image again. Lo…
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how do water molecules orient themselves when sugar dissolves in water?…
B. Oxygen atoms face the sugar molecule.
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a typical bottle of nail polish is made up of 45% acetone, 25% ethyl ac…
D. acetone (assuming the options are labeled as A. water, B. glycerin, C. ethyl acetate, D. acetone)
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which model correctly represents dissolved kf?
The model in the top - right (the second model when looking at the four models: top - left, top - right, bottom - left, bottom - right) correctly represents dissolved KF. In this …
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when a solute dissolves completely in water, which observation will alw…
A. The mixture will appear clear.
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the two half-reactions are given below. 3e⁻ + 2h₂o + mno₄⁻ → mno₂ + 4oh…
3
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the redox reaction given below occurs in basic solution. mno₄⁻ + cn⁻ → …
2
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the redox reaction given below occurs in basic solution.\\(\\ce{mno^-_{…
3
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the two half-reactions are given below. $6\\mathrm{e}^- + 7\\mathrm{h}_…
10
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the redox reaction given below occurs in basic solution. $\\ce{cr_{2}o^…
10
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the two half - reactions are given below. $4e^- + 3h_2o + teo_3^{-2} \\…
1
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the redox reaction given below occurs in basic solution. teo₃⁻² + n₂o₄ …
4
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the two half-reactions are given below. $6\\mathrm{e}^- + 3\\mathrm{h}_…
3
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the redox reaction given below occurs in basic solution. zn + bro₃⁻ → z…
2
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the redox reaction given below occurs in basic solution. zn + bro₃⁻ → z…
6
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the two half-reactions are given below: $6\\mathrm{e}^- + 7\\mathrm{h}_…
7
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the redox reaction given below occurs in basic solution.\\(\\ce{cr2o7^{…
6
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the redox reaction given below occurs in basic solution.\\(\\ce{cr2o7^{…
2
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with both half - reactions now balanced and having the same number of e…
\times2=6\) H (from \(3H_2O\)). So H is balanced in second half - reaction. Now, when we add the two half - reactions: Left side H: 8 (from first) + 6 (from second) = 14 Right sid…
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the two balanced half-reactions are given below. \\(3\\mathrm{e}^- + 2\…
2
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the products oh⁻ and h⁺ combine to make six h₂o molecules, allowing for…
6
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now h⁺ can be neutralized using oh⁻ on both sides of the reaction. how …
6 (We add 6 $\ce{OH^-}$ to both sides of the reaction)
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now that h₂o was used to balance out the oxygen on the side, hydrogen n…
6
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the redox reaction given below occurs in basic solution. br⁻ + mno₄⁻ → …
3
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the reactants oh⁻ and h⁺ combine to make four h₂o molecules, allowing f…
3
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now h⁺ can be neutralized using oh⁻ on both sides of the reaction. how …
4 (for both the left and right \( OH^- \) blanks)
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now that h₂o was used to balance out the oxygen on the product side, hy…
4
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the redox reaction given below occurs in basic solution. br⁻ + mno₄⁻ → …
2
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the two balanced half - reactions are given below. $ce{h_{2}o + h_{3}as…
2
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balance the arsenous acid half-reaction. h₃aso₃ → h₃aso₄ how many elect…
2
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arsenous acid can be oxidized to arsenic acid by iodine, resulting in t…
2
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what is the coefficient for h₃aso₃ in the balanced net ionic equation? …
1
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aresenous acid can be oxidized to aresenic acid by iodine, resulting in…
The coefficient of \(H_2O\) in the balanced net ionic equation is 1.
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the balanced half - reactions for the reaction between potassium bromat…
3
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potassium bromate reacts with sulfur dioxide in acidic solution. balanc…
2
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potassium bromate reacts with sulfur dioxide in acidic solution. balanc…
6
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the two half-reactions are given below. \\(14\\text{h}^+ + \\text{cr}_2…
3
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the dichromate ion is reduced by the chloride ion in acidic solution. b…
2
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the dichromate ion, $mathrm{cr_2o_7^{2-}}$, is reduced by the chloride …
6
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the electrons are on the product side. how many electrons are required …
\(1\)
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the vanadyl ion is oxidized in acidic solution, forming v(oh)₄⁺. balanc…
B
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permanganate reacts with the vanadyl ion in acidic solution, forming v(…
B
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the two half - reactions are given below. $6e^- + 6h^+ + clo_3^- \ ight…
3
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potassium chlorate reacts with sulfur dioxide in acidic solution accord…
4
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potassium chlorate reacts with sulfur dioxide in acidic solution accord…
3
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oxidation half - reaction $5\\ce{h_{2}c_{2}o_{4}} \ ightarrow 10\\ce{co…
The coefficients are \(5\) (for \(H_{2}C_{2}O_{4}\)), \(6\) (for \(H^{+}\)), \(2\) (for \(MnO_{4}^{-}\)), \(10\) (for \(CO_{2}\)), \(2\) (for \(Mn^{2+}\)) and \(8\) (for \(H_{2}O\…
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original skeleton equation h₂c₂o₄ + mno₄⁻ → co₂ + mn²⁺ oxidation half -…
5
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how many electrons should be added to the reactant side? ?e⁻ + 8h⁺ + mn…
5
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which side will the electrons be added to in the half - reaction? $8\\c…
A. Add electrons to the reactant side
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what is the overall charge on the product side of the equation? 8h⁺ + m…
+2
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what is the overall charge on the reactant side of the equation? 8h⁺ + …
\(+7\)
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how many hydrogen ions should be added to the reactant side? ?h⁺ + mno₄…
8
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now lets look at the reduction half-reaction. how many water molecules …
4
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how many electrons must be added to balance the charge in the half - re…
2
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which side will the electrons be added to in the half - reaction? \\(\\…
B. Add electrons to the product side
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what is the coefficient for h+ in the half reaction? h₂c₂o₄ → 2co₂ + ?h⁺
2
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to begin balancing the oxidation half-reaction, what is the coefficient…
2
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oxalic acid goes through a redox reaction with the permanganate ion to …
A. \( \ce{H_2C_2O_4 ightarrow CO_2} \)
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3.0 m hydrochloric acid is poured over an iron nail and a reaction happ…
B. Chloride ion becomes chlorine gas.
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what is the balanced chemical reaction occurring when zinc metal is add…
\( \text{Zn}+2\text{HF} ightarrow\text{ZnF}_2+\text{H}_2 \) (the option with this reaction equation)
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when aluminum is added to a solution of calcium sulfate, which of the f…
A. No reaction occurs.
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what is the balanced chemical reaction occurring when copper reacts wit…
No reaction occurs.
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when nickel(ii) nitrate is poured over copper strips, which of the foll…
B. No reaction occurs.
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what is studied by earth scientists who specialize in geochemistry?
Earth scientists specializing in geochemistry study the chemical composition, structure, and processes of Earth’s materials (such as rocks, minerals, and fluids) and the chemical …
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read the excerpt from ovids \pyramus and thisbe\. the blood leaped high…
The figurative language describes the violence of the scene.
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what quantity in moles of mno₃ are produced when 4.30 kg of oxygen gas …
$89.6$ moles
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what is the minimum mass of oxygen gas necessary to produce 200. g of s…
32.6 g
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what is the theoretical yield of ammonia that can be obtained from the …
56.3 g (Option: 56.3 g)
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how many grams of silver nitrate are necessary to react completely with…
2378 g (Option: 2378 g)
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how many moles of phosphine (ph₃) are produced for every 4.0 moles of h…
2.7 moles (Option: 2.7 moles)
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which one of the following is an example of a balanced chemical reactio…
$\boldsymbol{8\ce{HCl} + 2\ce{KMnO4} ightarrow 3\ce{Cl2} + 2\ce{MnO2} + 4\ce{H2O} + 2\ce{KCl}}$ (the last option in the list)
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calculate the mass of 3.00 moles of cf₂cl₂. ○3.00 g ○174 g ○363 g ○1.81…
363 g (corresponding to the option "363 g")
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what is the molar mass of acetaminophen, c₈h₉no₂? ○151.16 g/mol ○43.03 …
151.16 g/mol
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how many moles of hcl are represented by 1.0 × 10¹⁹ hcl molecules? 1.7 …
\( 1.7\times 10^{-5} \) mol (corresponding to the option: \( 1.7\times 10^{-5} \) mol)
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select true or false: the definition of a mole is an avogadros number o…
true
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give the formula for carbon disulfide. css₂ c₃s₄ c₂s cs cs₂
\( CS_2 \) (the option corresponding to \( CS_2 \) among the given choices)
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name the compound $\\ce{n_2o_4}$. - nitrous oxide - dinitrogen pentoxid…
D. dinitrogen tetroxide
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name the compound cuso₄. copper(i) sulfate copper(i) sulfite copper(ii)…
Copper(II) sulfate
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the name for $\\ce{nh_4no_3}$ is ammonium nitrate. ammonium nitrogen tr…
A. ammonium nitrate.
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you have 150.0 ml of a 0.507 m solution of ce(no₃)₄. what mass (in gram…
29.52 g
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name the compound $ce{al_{2}o_{3}}$.\ \ \\bigcirc aluminum oxide\ \\big…
A. Aluminum oxide
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what is the formula for the ionic compound containing iron(iii) ions an…
$\text{FeI}_3$ (corresponding to the option FeI₃)
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what is the formula for the ionic compound containing barium ions and s…
A. \( \text{BaSO}_4 \)
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what is the formula for the ionic compound containing sodium ions and n…
Na₃N (the option labeled "Na₃N")
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what is the ion $\\ce{clo4-}$ named? \\chloride ion \\chlorite ion \\hy…
E. perchlorate ion
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what type of compound is $nh_4no_3$? ionic molecular acid base hydrate
A. Ionic
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an oxide ion, o$^{2-}$, has: 8 protons and 10 electrons 10 protons and …
8 protons and 10 electrons (the first option: 8 protons and 10 electrons)
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give the number of protons (p), neutrons (n), and electrons (e) in one …
92 p, 146 n, 92 e (corresponding to the option "92 p, 146 n, 92 e")
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which one of the following elements is most likely to form a 2+ ion? ca…
A. calcium
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which one of the following is an ion? ○ b₃⁺ ○ nacl ○ he ○ ¹⁴c ○ none of…
A. \( B^{3+} \)