Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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2agno₃ + cacl₂ → 2agcl + ca(no₃)₂ what mass of cacl₂ is used up when 80…
\( 26.14 \)
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2agno₃ + cacl₂ → 2agcl + ca(no₃)₂ you found that agno₃ is the limiting …
\( \boxed{67.5} \) (Note: More precise calculation: \( \frac{80.00}{169.88} \times 143.32 \approx 67.48 \approx 67.5 \, \text{g} \))
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2agno₃ + cacl₂ → 2agcl + ca(no₃)₂ 80.00 g agno₃ react with 30.00 g cacl…
1
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n₂(g) + 3h₂(g) → 2nh₃(g) the reaction begins with 3.0 l n₂. you found t…
\(1.0\space L\)
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n₂(g) + 3h₂(g) → 2nh₃(g) the reaction begins with 3.0 l n₂ and 6.0 l h₂…
\( 2.0 \, \text{L} \)
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according to the reaction, 3.0 l n₂ can form 6.0 l nh₃. 6.0 l h₂ can fo…
\(H_2\) (the reactant \(H_2\) is limiting because it produces a smaller volume of \(NH_3\) compared to \(N_2\) when fully reacted)
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we can use liter ratios for gaseous reactions at stp. n₂(g) + 3h₂(g) → …
\( 6.0 \, \text{L} \)
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4al(s) + 3o₂(g) → 2al₂o₃(s) the reaction began with 32.0 g o₂. the reac…
$20.0\ \text{g}$
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now that we know which reactant is limiting, we can use it to find othe…
12.0 g
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13.5 g al can produce 25.5 g al₂o₃. 32.0 g o₂ can produce 68.0 g al₂o₃.…
Al (the reactant Al is limiting because it produces a smaller amount of the product \( \text{Al}_2\text{O}_3 \) compared to \( \text{O}_2 \))
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molar masses 4al(s) + 3o₂(g) → 2al₂o₃(s) 26.98 g/mol 32.00 g/mol 101.96…
\(\approx 68.0\ g\) (or more precisely \(67.97\ g\))
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in limiting reactant problems, we normally begin by calculating the amo…
The mass of \( \text{Al}_2\text{O}_3 \) formed is approximately \( 25.5\ \text{g} \) (or more precisely \( 25.49\ \text{g} \)).
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a hydrocarbon fuel is fully combusted with oxygen to yield 23.118 g of …
The empirical formula is \(\boldsymbol{CH}\) (so \(C_1H_1\), but written as \(CH\)). Wait, but wait, maybe I messed up. Wait, let's calculate the mass of C: 0.5253 mol * 12.01 g/m…
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a neurotransmitter consists of carbon, hydrogen, nitrogen, and oxygen. …
10
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the sample contains 0.624 mol c, 1.248 mol h, and 0.078 mol o. determin…
16
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the sample contains 0.624 mol c, 1.248 mol h, and 0.078 mol o. determin…
8
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how many moles o are in 1.246 g o? ? mol o do not round! include lots o…
0.077875
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the 10.00 g sample contains 7.494 g c and 1.260 g h. how many grams of …
\( 1.246 \)
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how many grams of h are present in 1.247725 mol h? ? g h do not round! …
\(1.2576333865\)
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how many grams of c are present in 0.6239945 mol c? ? g c do not round!…
\( 7.4943333 \)
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a carbohydrate contains c, h, and o. a 10.00 g sample of the compound b…
\(1.248046\)
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a carbohydrate contains c, h, and o. a 10.00 g sample of the compound b…
\( 0.6240 \) (more precisely, \( 0.6239945467 \)) but based on the calculation, since 27.462/44.01 = 0.624 (exactly, as 44.01*0.624 = 27.46224, which is very close to 27.462, so t…
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a carbohydrate contains c, h, and o. a 10.00 g sample of the compound b…
0.6239945 (or more precisely, 27.462 / 44.01 = 0.6239945467...)
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what is the empirical formula of the compound? identify the subscript f…
4
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0.1468 mol c : 0.3668 mol h : 0.07344 mol n the moles of each component…
2
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treatment of the nitrogen with h₂ gas resulted in 1.251 g nh₃. how many…
\(0.073456\) (or more precise value from the calculation \(\frac{1.251}{17.03052}\))
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in the course of the combustion analysis of an unknown compound contain…
\(0.3668\)
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based on the previous steps, what is the empirical formula of the menth…
10
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now that we know there are 0.010307 g o, how many moles o are in the sa…
\( 6.441875 \times 10^{-4} \)
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mass sample = 0.1005 g mass carbon = 0.077201 g c mass hydrogen = 0.012…
\( 0.010307 \)
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now do the same for the hydrogen. convert moles h to g h. there are 0.0…
\( 0.0129656 \) (or more precise value with at least six digits, e.g., \( 0.01296562 \))
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since there are two sources of oxygen (the menthol and the air), we hav…
\(0.0772\) (or more precisely, \(0.0064280845\times12.01 = 0.077201294845\approx0.0772\) g C)
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when the sample burns, 0.1159 g h₂o also form. how many moles of hydrog…
\(0.012866\) (or more precise value from \(\frac{0.1159\times2}{18.016}\approx0.012866\))
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menthol, a compound containing c, h, and o, has a strong mint - like sm…
\(0.00642808\)
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question 1 of 49 add lone pairs to compound b. select draw templates mo…
The completed structure has: - Oxygen atom with **2 lone pairs** (4 total non-bonding electrons) - Nitrogen atom with **1 lone pair** (2 total non-bonding electrons) Final structu…
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after combustion with excess oxygen, 12.501 g of a petroleum compound m…
\(2.082\)
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after combustion with excess oxygen, 12.501 g of a petroleum compound m…
\(0.868\) (or more precisely, the value from \(\frac{38.196}{44.01}\) which is approximately \(0.868\) moles)
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the table above provides the values for the standard enthalpy change fo…
B. \(\boldsymbol{\Delta H_f^\circ}\) for \(\boldsymbol{\text{N}_2\text{O}_5(g)}\)
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draw ch₃ch(ch₃)ch₂cho
The structural formula (condensed line-angle structure description and full Lewis structure breakdown): 1. Line-angle structure: A 4-carbon chain, where the first carbon is the al…
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complete the table below by writing the symbols for the cation and anio…
| Ionic Compound | Cation | Anion | |----------------|--------------|--------------| | \( \ce{NaCl} \) | \( \ce{Na^+} \) | \( \ce{Cl^-} \) | | \( \ce{MnCl2} \) | \( \ce{Mn^{2+}} \…
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reaction 1: \\( 2 \\, \\text{o}_3(g) \ ightarrow 3 \\, \\text{o}_2(g) \…
C. \( 2 \text{NO}(g) + \text{O}_2(g) ightarrow 2 \text{NO}_2(g) \)
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22 mark for review \\(\\ce{c_{2}h_{6}(g) + \\frac{7}{2} o_{2}(g) -> 2 c…
C. $\text{H}_2(g) + \frac{1}{2}\ \text{O}_2(g) ightarrow \text{H}_2\text{O}(l)$ $\Delta H^{\circ} = -286\ \text{kJ}$
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| ch₄(g) | -75 | | o₂(g) | 0 | | co₂(g) | -390 | | h₂o(g) | -240 | natu…
C. $\Delta H_{rxn}^{\circ} = [(-390\ \text{kJ/mol}) + 2(-240\ \text{kJ/mol})] - (-75\ \text{kJ/mol})$
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substance | $delta h_f^circ$ (kj/mol) --- | --- $so_2(g)$ | -296.1 $so_…
B. $-99.1\ \text{kJ/mol}_{\text{rxn}}$
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substance | $delta h_f^o$ (kj/mol) caco₃(s) | -1210 cao(s) | -640 co₂(g…
B. +180 kJ
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bond type | average bond enthalpy h - h | 436 kj/mol cl - cl | 243 kj/m…
B. $-185\ \text{kJ/mol}_{\text{rxn}}$
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type of bond | average bond enthalpy (kj/mol) o - o | 150 o = o | 500 2…
C. 300 kJ/mol
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2 co(g) + c(g) → c₃o₂(g) δh° = 127.3 kj/molᵣₓₙ the equation shown above…
B. 63.7 kJ
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complete the table below by writing the symbols for the cation and anio…
For each compound, the cation and anion are: - \( \text{VI}_3 \): Cation \( \boldsymbol{\text{V}^{3+}} \), Anion \( \boldsymbol{\text{I}^-} \) - \( \text{NH}_4\text{F} \): Cation …
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$$2 \text{ al}(s) + \text{fe}_2\text{o}_3(s) ightarrow 2 \text{ fe}(s) …
D. 1700 kJ
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$$ce{na_{2}s_{2}o_{3}(aq) + 4 naocl(aq) + 2 naoh(aq) -> 2 na_{2}so_{4}(…
C. 618 kJ of heat is released.
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complete the table below by writing the symbols for the cation and anio…
Cation: $\boldsymbol{\text{Cr}^{2 + }}$ (Wait, no, earlier calculation was wrong. Wait, let's do it again. Wait, maybe the anion is $\text{PO}_4^{2 - }$ (if it's a different ion, …
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the heating curve for 1.0 mole of na initially at 25.0°c is shown above…
A. Approximately 13 kJ of heat are absorbed as a result of the increase in potential energy between the Na atoms.
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the table above provides the values for some physical properties of $\\…
C. 2 moles of $\ce{H2S}$
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particulate models of the evaporation of liquid water and the condensat…
C. The amount of energy absorbed by one mole of water molecules as they escape the liquid is equal to the amount of energy released by one mole of water molecules as they come tog…
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convert the condensed formula hccch(ch₃)₂ into its expanded structure. …
The expanded structure is: ``` H | H-C≡C-C-CH₃ | CH₃ ``` Or written with all explicit hydrogens: $H-C≡C-C(CH_3)(CH_3)$ with each $CH_3$ showing: ``` H | H-C≡C-C-H / \ H H / \ H H …
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a student dissolves 8.00 g of $\\ce{nh4no3}(s)$ in 100. g of $\\ce{h2o}…
B. $-5.50\ ^{\circ}\text{C}$
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based on the particle model, which equation best accounts for the chemi…
's see, the black (X) with three white (Y)? Wait, no, the product molecules: each is a black (X) with three white (Y)? Wait, no, the diagram: product has molecules with one black …
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question 17 of 49 propane is an alkane with the molecular formula c₃h₈.…
The complete structure of propane is: $$\ce{H - \underset{\underset{H}{|}}{C} - \underset{\underset{H}{|}}{C} - \underset{\underset{H}{|}}{C} - H}$$ $$\hspace{0.5em} \hspace{0.3em…
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for each row in the table below, decide whether the pair of elements wi…
To solve this, we analyze each element pair: ### Row 1: Hydrogen (H) & Chlorine (Cl) - **Molecular Compound?** Yes (both nonmetals, form covalent bonds). - **Formula (fewest atoms…
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the graph above shows the changes in temperature recorded for the 2.00 …
B. 25 kJ
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the table provides data for two ch₃oh(l) samples. based on this informa…
D. The $\ce{CH_{3}OH}$ molecules from sample 1 transfer thermal energy to the $\ce{CH_{3}OH}$ molecules from sample 2 through collisions because the average kinetic energy of the …
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two aqueous nacl solutions of equal volume and concentration were kept …
B. The average kinetic energy of the particles in the cooler solution will increase as they collide with the particles from the warmer solution.
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a student carefully drops a 9.0 g solid zn pellet initially at 50.0 °c …
B. Collisions between the water molecules and the surface of the Zn pellet will result in the transfer of energy, increasing the average kinetic energy of the water molecules.
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an advertisement for a commercial hand warmer claims that the hand warm…
A. The advertisement’s claim is inaccurate because heat flowing from the hands to the warmer would only happen if the chemical reaction was endothermic, which would cause the hand…
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which balanced chemical equation does the particle diagram represent? r…
A. \( 3\text{CH}_4 + 6\text{O}_2 ightarrow 3\text{CO}_2 + 6\text{H}_2\text{O} \)
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when pellets of naoh(s) are added to a flask of water, it is observed t…
C. It is an exothermic process because heat energy is absorbed by the water as the $\ce{NaOH}(s)$ dissolves in it.
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hcl(aq) + nh₃(aq) → nh₄⁺(aq) + cl⁻(aq) the chemical reaction between hc…
C. It is an exothermic process, because energy is released by the reaction and is gained by the reaction mixture.
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for each row in the table below, decide whether the pair of elements wi…
(for each row): | Element #1 | Element #2 | Molecular Compound? | Formula | Name | |------------|------------|---------------------|---------|------| | Hydrogen | Chlorine | $\che…
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for each row in the table below, decide whether the pair of elements wi…
For the row with Hydrogen (element #1) and Oxygen (element #2): - "element pair will form a molecular compound": Checked. - Chemical formula: $\ce{H_2O}$ - Molecular compound name…
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draw all the structural isomers for the molecular formula c₃h₇br. draw …
1. 1-Bromopropane: ``` H H H | | | H-C-C-C-Br | | | H H H ``` 2. 2-Bromopropane: ``` H H H | | | H-C-C-C-H | | | H Br H ```
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which of these are illegal or scam activities? check all that apply. □ …
- running a pyramid scheme - threatening to harm property - downloading a virus - hacking a computer
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which image depicts the correct particle model for the products of the …
The third image (with molecules each having two black spheres and one white sphere, arranged as \( \ce{H_2O} \) models)
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a sample of x is carefully weighed and put inside a vented flask. water…
First experiment: physical Second experiment: physical
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in each case, decide whether the property measured was a chemical or ph…
chemical ### For the second experiment (D):
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heated until oxygen gas starts being produced. after no more oxygen gas…
chemical ### Second Experiment (Radio - Frequency Current Through Sample)
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experiments were done on a certain pure substance x to determine some o…
chemical ### For the second experiment (E):
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fill in the systematic names of the following chemical compounds. note:…
To solve the problem of naming the given molecular compounds, we follow the rules for naming molecular (covalent) compounds, which involves using prefixes to indicate the number o…
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based on the particle model, which equation best accounts for the chemi…
B. \(N_2 + 3H_2 ightarrow2NH_3\)
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based on the particle model, which reactant is the limiting reactant? x…
element X
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based on the particle model, which equation best accounts for the chemi…
C. C + 2H₂ → CH₄ (Wait, the options are: first option: C + O₂ → CO₂, second: 4C + 6O₂ → 4CO₂ + 2O₂, third: C + 2H₂ → CH₄. So the correct option is the third one, which is C + 2H₂ …
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fill in the systematic names of the following chemical compounds. note:…
Tetraphosphorus trisulfide
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question 4 of 6 4 what evidence does the author use to support the gian…
A. Earth and Moon rocks are almost chemically identical C. The Moon is about one-quarter of Earth's diameter
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earth and moon rocks are almost chemically identical the moons size is …
- Earth and Moon rocks are almost chemically identical - The Moon is about one-quarter of Earth's diameter
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fill in the systematic names of the following chemical compounds. note:…
To determine the systematic names of the given molecular compounds, we use the rules for naming molecular (covalent) compounds: prefixes are used to indicate the number of each at…
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why is there a change in energy during chemical reactions? (1 point) ch…
Energy is released by the formation of chemical bonds, and energy is absorbed when the bonds are broken.
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a cold pack is snapped, and the chemical reaction causes the pack to fe…
This is an endothermic reaction because the system took energy from the surroundings.
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which statement is true of energy in reactants during an endothermic re…
The energy found in the reactants remains in the system, and the reactants also take energy from the surroundings.
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a candle slowly burns until the last bit of wax and wick are gone. the …
C. In the air, only the oxygen is part of the system.
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which quantity will always have a negative value? (1 point) the change …
the change in energy in a system during an exothermic reaction
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fill in the systematic names of the following chemical compounds. note:…
To solve this, we name each molecular compound using systematic naming (prefixes for molecular compounds): ### For \( \boldsymbol{\text{CO}} \): - Contains carbon (C) and oxygen (…
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unit 5 sections a & b test review part a. naming ionic and molecular co…
| Chemical Formula | Ionic or Molecular Compound? | Chemical Name | |------------------|-------------------------------|---------------| | $\text{P}_5\text{Cl}_{10}$ | Molecular |…
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fill in the systematic names of the following chemical compounds. note:…
To solve this, we name each molecular compound using systematic naming rules (prefixes for molecular compounds): ### For $\boldsymbol{\ce{SiO}}$: - Contains silicon (Si) and oxyge…
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how did you pick the air molecules in the previous question? * ○ they h…
They had the same types atoms as the food molecules.
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write the chemical symbol for an element belonging to each of the eleme…
For the "noble gas" family, an example element's chemical symbol is $\boldsymbol{He}$ (or $Ne$, $Ar$, etc.). For the "alkaline earth" family, an example element's chemical symbol …
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write the name of the element family to which each of the elements in t…
For fluorine: Halogens For magnesium: Alkaline Earth Metals
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how does parent material influence soil formation? a. it provides the i…
a. It provides the initial material from which soil is formed b. The breakdown of rocks into smaller particles
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are three sets of sketches below, showing the same pure molecular compo…
To solve this, we analyze the states of matter based on the melting and boiling points of \( \text{SO}_2 \) (melting point \( -72.0^\circ\text{C} \), boiling point \( -10.0^\circ\…
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11. calcium hydroxide + phosphoric acid → water + calcium phosphate 12.…
11. $3\text{Ca(OH)}_2 + 2\text{H}_3\text{PO}_4 ightarrow 6\text{H}_2\text{O} + \text{Ca}_3(\text{PO}_4)_2$ 12. $\text{BaCl}_2 + \text{Na}_2\text{CO}_3 ightarrow \text{BaCO}_3 + 2\…
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in the spectrophotometry lab experiment, you constructed a calibration …
The calibration curve was used to determine the molar absorptivity, $\epsilon$, which was the slope of the line.