Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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what is the chemical formula for dinitrogen tetroxide? $\\circ$ $\\ce{n…
C. \( \text{N}_2\text{O}_4 \) (assuming the third option is labeled C, with the formula \( \text{N}_2\text{O}_4 \))
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identify the correct name for the compound no₂ which is a red - brown c…
C. nitrogen dioxide
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what is the formula for the ionic compound aluminum oxide?\ \\bigcirc a…
D. \( \text{Al}_2\text{O}_3 \) (assuming the last option with the correct formula is labeled as such, but based on the options, the correct one is \( \text{Al}_2\text{O}_3 \))
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what is the name of the compound (nh₄)₃po₄? ○ammonium phosphide ○triamm…
D. ammonium phosphate
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what is the proper name for $\\ce{mgbr_{2}}$? \\bigcirc magnesium bromi…
A. magnesium bromide
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what is the ion symbol for the phosphide ion? options: - $\\ce{p^{2-}}$…
D. $p^{3 - }$ (assuming the last option is labeled D, with the option text $p^{3 - }$)
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which of the following elements will most likely form a covalent bond? …
B. nitrogen and chlorine
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which of the following could represent an ion symbol for an atom with 1…
\( \boldsymbol{K^+} \)
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neon-22 contains ______ neutrons. 10 12 22 2
12 (and the correct option is the one with 12, i.e., the option marked with the blue dot, which is the option labeled "12")
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neon-22 contains ______ neutrons. 10 12 22 2
12 (The correct option is the one with 12, so if we consider the options as: 10, 12, 22, 2; the answer is the option with 12, e.g., if the options are labeled as: the option with …
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thallium-201 is a radioactive isotope used in the diagnosis of coronary…
201 (corresponding to the option with 201)
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part 5: energy diagrams a. exothermic reaction - draw an energy diagram…
### A. Reacción Exotérmica #### Explicación del Diagrama: 1. **Ejes**: El eje vertical representa la energía ($E$), el eje horizontal representa el progreso de la reacción (tiempo…
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the name of the noble gas in period 3 is ______. ○helium ○neon ○krypton…
D. argon
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name _______________________________ due friday, january 25, 2026 celeb…
A dry can won't collapse because there's no water to vaporize and then condense, so the pressure inside and outside the can remains relatively equal (no large pressure difference …
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what is the chemical symbol for the halogen located in period 5? ○i ○xe…
A. I
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which element is a metal? k si p kr more than one of the elements is a …
A. K
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in which state(s) is/are the particles randomly arranged? solids only l…
E. liquids and gases
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an unknown solid is taken to the laboratory for analysis. which of the …
The substance produces a gas when combined with $\ce{NaHCO_{3}}$ in water.
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a 15.0 ml urine sample from a dehydrated patient has a density of 1.019…
$1.53 \times 10^4$ mg (corresponding to the option "1.53 × 10⁴ mg")
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celebration of molecules, solids, liquids, gases, and intermolecular fo…
### Part 1: Adding Water Molecules (Intermolecular Forces - Hydrogen Bonding) Water molecules (\(H_2O\)) have a bent structure with a partial negative charge on the oxygen (\(O\))…
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convert the 39.8°c to kelvin. ○313 k ○4.33 k ○71.8 k ○129 k
313 K (the option corresponding to this value, e.g., if the first option is "313 K", then the answer is the option with "313 K")
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what is the correct metric relationship between milliliters and microli…
C. 1 milliliter = 1,000 microliters (assuming the options are labeled A to E with the third option being C; if the original options have different labels, adjust accordingly, but …
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which measured value contains a zero that is not a significant figure? …
B. 0.984
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19. choose the product that best provides evidence of chemical change w…
19. precipitate 20. synthesis
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17. choose the product that best provides evidence of chemical change w…
17. gas 18. $\text{Cu}^{2+}$, $\text{Mg}^{2+}$
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18. choose all that apply. identify the two cations in the following ch…
1. For the reaction $\ce{Na2S(aq) + 2HCl(aq) -> 2NaCl(aq) + H2S(g)}$: gas 2. For the reaction $\ce{Mg(s) + Cu(NO3)2(aq) -> Mg(NO3)2(aq) + Cu(s)}$: $\ce{Cu^{2+}}$, $\ce{Mg^{2+}}$
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15. choose the best answer. the following chemical equation shows the f…
15. $\text{Fe(NO}_3\text{)}_3(aq)$ 16. thermal decomposition
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13. choose the best answer. when an ionic compound is dissolved in wate…
13. a. dissociation 14. $\text{MgCO}_3(s) ightarrow \text{MgO}(s) + \text{CO}_2(g)$
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12. choose the best answer. what is this reaction classified as? $2na_3…
11. gas 12. double replacement
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choose the best answer. what type of single replacement reaction is tak…
D. the replacement of hydrogen in an acid by a metal --- ### For Question 10:
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on a 14 day wilderness expedition youll need to heat 3.0 kg of water to…
3
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4. choose all that apply. which two skeleton or balanced equations repr…
## Question 4: C. $3\text{H}_2(g) + \text{N}_2(g) ightarrow 2\text{NH}_3(g)$ D. $\text{KCl} + \text{O}_2 ightarrow \text{KClO}_3$ ## Question 5: precipitate, water ## Question 6: …
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1 choose the best answer. which equation shows that heat has been added…
1. $\text{H}_2\text{O} \xrightarrow{\Delta} \text{H}_2 + \text{O}_2$ 2. synthesis 3. $\text{N}_2(g) + \text{O}_2(g) + \text{H}_2\text{O}(g)$
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name _______________________________ due friday, january 25, 2026 celeb…
### Hotest Container (Gas, assuming thermal energy increases up) #### Sketch: Draw particles (molecules/atoms) far apart, moving freely and randomly (including translational, rota…
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2) choose the best answer. look at the products of this equation. what …
### Part 1 (Drag-and-Drop Matches): - double replacement reaction: two aqueous compounds exchange ions to produce two new compounds - gas: bubbles are formed to indicate this type…
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3) choose the best answer. look at the products of this equation. what …
3) A. gas 4) B. precipitate, C. water 5) A. $2\text{HCl} + \text{CaCO}_3 ightarrow \text{CaCl}_2 + \text{H}_2\text{O} + \text{CO}_2$
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6) choose the best answer. the yellow substance in the test tube shown …
(Question 6): precipitate ---
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4. how many moles are present in 120 g of caco₃? 5. calculate the mass …
1.2 moles ### Question 5
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thinking steps: 1. write the unbalanced chemical equation with the corr…
1. $\boldsymbol{2}\ce{H_2} + \boldsymbol{1}\ce{O_2} ightarrow \boldsymbol{2}\ce{H_2O}$ 2. $\boldsymbol{1}\ce{N_2} + \boldsymbol{3}\ce{H_2} ightarrow \boldsymbol{2}\ce{NH_3}$ 3. $\…
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4) drag and drop the equations with the descriptions. 2al(s) + 3cucl₂(a…
### Drag-and-Drop Matches: 1. $2\text{Al}(s) + 3\text{CuCl}_2(aq) ightarrow 2\text{AlCl}_3(aq) + 3\text{Cu}(g)$ → the replacement of a metal cation by another metal 2. $2\text{Li}…
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2) choose the best answer. identify the two cations that swap in the fo…
1. reactive series 2. $\text{Ag}^{+}$, $\text{H}^{+}$
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how many atoms are indicated by the prefixes for each of the following …
- 1 atom: monochloride - 2 atoms: difluoride, dibromide - 3 atoms: trifluoride, trioxide - 4 atoms: tetrasulfide, tetrabromide - 5 atoms: pentachloride - 6 atoms: hexabromide
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drag the labels to their respective targets. view available hint(s) res…
### Part A (Matching Chemical Formulas to Covalent Compounds) # Explanation: ## Step 1: Analyze Phosphorus Trichloride Phosphorus trichloride has one phosphorus (P) and three chlo…
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part a determine whether the name shown for each of the following molec…
- Correct: \( \boldsymbol{\ce{NF_3}} \) (nitrogen trifluoride) - Incorrect: \( \boldsymbol{\ce{PBr_5}} \) (phosphorus(V) pentabromide), \( \boldsymbol{\ce{P_2O_3}} \) (phosphorus …
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part a determine whether the name shown for each of the following molec…
To solve this, we analyze each compound's naming using molecular compound nomenclature (prefixes for non - metal - non - metal compounds, and for some with variable oxidation stat…
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missed this? watch kcv: names: molecular compounds, iwe: nomenclature: …
correct: \( \boldsymbol{SCl_4} \) (sulfur tetrachloride) incorrect: \( \boldsymbol{CCl_4} \) (carbon (IV) iodide), \( \boldsymbol{CO} \) (carbon oxide), \( \boldsymbol{NCl_3} \) (…
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learning goal: to learn how to write ionic formulas. here are some thin…
\( \text{CuO} \) ### Part B
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a hand warmer packet contains iron powder (fe) that reacts with oxygen …
The molar mass of $\ce{Fe_{2}O_{3}}$ is approximately $159.7\space g/mol$. ### Second Sub - Question: Compare the molar mass of $\ce{Fe_{2}O_{3}}$ to the molar mass of $\ce{O_{2}}…
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a hand warmer packet contains iron powder (fe) that reacts with oxygen …
- Molar mass of $\ce{Fe_{2}O_{3}}$: $\boldsymbol{159.7\ \text{g/mol}}$ (or approximately $160\ \text{g/mol}$) - $\ce{Fe_{2}O_{3}}$ is heavier. The molar mass of $\ce{Fe_{2}O_{3}}$…
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density table (partially visible) with liquids and their densities in g…
Density: $0.93\ \text{g/cm}^3$ Is it possible to identify the liquid? $\bigcirc$ yes Identified liquid: pentane
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liquid | density carbon tetrachloride | \\(\\frac{1.6\\ \\text{g}}{\\te…
Calculated density: $\boldsymbol{0.79\ \text{g/mL}}$ Is it possible to identify the liquid? $\boldsymbol{\text{yes}}$ Identified liquid: $\boldsymbol{\text{acetone}}$
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first, launch the video below. during the video, youll be asked a conce…
D. All of the statements identify why the formula - name is wrong.
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first, launch the nomenclature interactive. during the interactive, you…
B. aluminum bromide ### Part B
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missed this? watch iwe: writing formulas for ionic compounds containing…
$\boldsymbol{NaClO_2}$ (corresponding to the option "NaClO₂")
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missed this? watch iwe: writing formulas for ionic compounds; read sect…
A. \( \boldsymbol{BaBr_2} \)
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when a metal and a nonmetal exchange electrons to make a cation and an …
Form ionic bonds: manganese and chlorine, chlorine and sodium, sulfur and calcium, potassium and sulfur Do not form ionic bonds: nitrogen and bromine, lithium and calcium ### Part…
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some metals can form ions of different charges in different compounds. …
3+ (corresponding to the option "3+")
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what are the group numbers of these metals? drag the appropriate elemen…
- Group 1A: Li, Na, K, Rb, Cs - Group 2A: Ba, Ca, Sr, Mg - Group 3A: Al - Group 4A: (No elements)
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part a select the metals that form only one type of ion (that is, metal…
A. Sr, B. Al, C. Li, D. K, E. Cs, F. Mg, G. Ca, H. Na, I. Rb, J. Ba
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what questions do you need to ask about a substance in order to determi…
- An atomic element: Does it have single atoms as its base units? - An ionic compound: Is it composed of a metal cation and a nonmetal anion? - A molecular compound: Is it compose…
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classify each of the following compounds as ionic or molecular. if a co…
- Molecular: \( \text{NO}_2 \), \( \text{CBr}_4 \) - Ionic, one type of ion: \( \text{KCl} \) - Ionic, more than one type of ion: \( \text{Sn(SO}_4\text{)}_2 \)
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periodic table what is the density of carbon monoxide gas at stp condit…
A. 1.25 g/L
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what was silicon valley named after? (1 point) elements studied in chem…
○ chips used in computers
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how many moles of helium would you find in a birthday balloon that had …
A. 0.28 moles
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click on each blank box and select the option that completes the senten…
L/mol
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a teacher has given a lab student a white chemical sample and asks her …
46.7
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a reaction requires 2.573 moles of zinc oxide. how many grams of zno ar…
C. 209.5 g
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write the equilibrium constant expression for this reaction: h₂so₄(aq) …
\( K=\frac{[\ce{H+}]^2[\ce{SO4^{2-}}]}{[\ce{H2SO4}]} \)
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question 20 for the first reaction: (\boldsymbol{\text{maroon molecule}…
yes ### Second Equilibrium (Gray ⇌ Purple, \( K = \frac{1}{5} \))
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that is, select 1 in the second column for the most acidic molecule, 2 …
(Example Selection) - Bottom molecule: Select $\boldsymbol{1}$ (most acidic). - Third molecule: Select $\boldsymbol{2}$. - Top molecule: Select $\boldsymbol{3}$. - Second molecule…
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question 8 12.5 pts why is an acid - base indicator used in the experim…
The correct option is the one stating "It provides evidence that protonated water is being produced." (The option with the text "It provides evidence that protonated water is bein…
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question 5 which of the following is not a piece of equipment used in t…
C. a spectrophotometer ### Question 6
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12.3 participles and participial phrases key information participles ar…
### Part A: Identifying Participles and Participial Phrases 1. **Sentence**: Standing on the corner of Hollywood and Vine, Barbara felt as if she owned the world. - Participle/Par…
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answer the questions in the table below about the shape of the iodine p…
(First Question): 6 ### Second Question (Arrangement of Electron Groups)
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check the box under each compound that exists as a pair of cis/trans is…
The box under the compound \(Cl - C(CH_3)=C(Cl)-CH_3\) (the second compound in the table) should be checked.
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the temperature at which the following process reaches equilibrium at 1…
144°C (corresponding to the option: 144°C)
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the heat of fusion $\\delta h_f$ of butane $c_4h_{10}$ is 4.7 kj/mol. c…
-1.3 J/K
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name the functional group shown in each molecule below. the first answe…
alkyne ### Third Molecule (Amine)
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for a chemical reaction, given $delta h^{circ} < 0$ and $delta s^{circ}…
As temperature increases, $\Delta G^\circ$ decreases. (The option with this statement)
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here are sketches of four atomic electron orbitals: a b c d are any of …
### Part 1: Are any of them s orbitals? s orbitals have a spherical shape. Orbitals A and C are spherical, so the answer is "yes". ### Part 2: List the s orbitals, if any. From th…
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what is $\\delta g^\\circ_{\\text{rxn}}$ in kj/mol for this reaction at…
-3497
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what is $\\delta g^\\circ_{\\text{rxn}}$ for the combustion of propane …
-2073.1 kJ/mol (corresponding to the option: -2073.1 kJ/mol)
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what is $\\delta g^\\circ_{\\text{rxn}}$ for the combustion of propane …
$\boldsymbol{-2073.1\ \text{kJ/mol}}$ (corresponding to the option: -2073.1 kJ/mol)
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this lewis structure may be incomplete. formal charges and bonds are sh…
Add one lone pair (two dots) to the oxygen atom. The carbon and hydrogen atoms have no missing lone pairs. So the Lewis structure should have a lone pair on the oxygen.
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which of these structures shows how the pictured molecule will look aft…
The structure in the second box (the one with Br as a wedge on the left - most carbon of the central two - carbon Br - containing part and a dashed Br below, with the double bond …
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13. another way to describe the slope is to use a for every statement. …
55.8 (the option with 55.8)
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12. analyze the graph to find the slope of the line for element 2. iden…
Slope of Element 2 = 207 \(\frac{g}{mol}\)
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8. another way to describe the slope is to use a for every statement. i…
12.0 (from the choices: the option with "12.0" as the value, so the choice is the one labeled 12.0, e.g., if the choices are listed as options, the correct one is the one with 12.…
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7. analyze the graph statistics to find the slope of the line for eleme…
Slope of Element 1 $=\boldsymbol{55.8}\frac{\boldsymbol{\text{g}}}{\boldsymbol{\text{mol}}}$
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identify the for every statement that matches the slope for element 2. …
65.4
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12. convert the following using dimensional analysis. show all work, in…
a) $0.001125\ \text{L}$ b) $8.5 \times 10^{-18}\ \text{Mg}$ c) $\approx 38580\ \text{lb/m}^3$ d) $1263.6\ \text{km/hr}$ e) $\approx 1.495 \times 10^6\ \text{in}^3$ f) $256.15\ \te…
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answer the questions below about the highlighted atom in this lewis str…
s: - Sigma bonds: \(\boldsymbol{2}\) - Pi bonds: \(\boldsymbol{2}\) - Hybridization: \(\boldsymbol{sp}\)
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write the systematic name of each organic molecule: | structure | name …
First: 2,3,5 - trimethylheptane Second: 4 - ethyl - 3 - methylheptane Third: 4 - chloro - 6 - methylheptane
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arrange the highlighted bonds in the table below in decreasing order of…
- For the \( \text{C-F} \) bond (first row): 1 - For the \( \text{C-O} \) bond (second row): 2 - For the \( \text{C-C} \) bond (third row): 3
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provide the correct name for nahco₃
Sodium bicarbonate (or Sodium hydrogen carbonate)
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what does a - z represent in nuclide symbol? \\(_{z}^{a}x\\) \\(\\bigci…
### First Question (What does A - Z represent in nuclide symbol?): # Brief Explanations: In the nuclide symbol \(\ce{_Z^A X}\), \(A\) is the mass number (number of protons + neutr…
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the two half-reactions are given below. \\( 3\\text{e}^- + 4\\text{h}_2…
The coefficient of \(H_2O\) in the balanced net ionic equation is 8.
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the redox reaction given below occurs in basic solution. tco₄⁻ + sn⁺² →…
3
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the electrons are on the reactant side. how many electrons are needed t…
\(6\)
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the bromate reacts with iron(ii) ions, forming bromide ions and iron(ii…
A. $\ce{BrO^{-}_{3}}$