Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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examine the lewis structure. h—h—ö what is incorrect in the structure? …
# Explanation: ## Step1: Recall Lewis structure rules Hydrogen can form 1 bond (2 electrons), oxygen can form 2 bonds (8 electrons in valence shell). The given structure has a mid…
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on a sheet of paper, draw the lewis structure for the following compoun…
The correct features (from the options) are: - S as the central atom - correct number of S and O atoms - six dots (electrons) associated with the O atoms not double bonded to S - …
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a meteoroid is a small piece of rock or metal that has broken off a lar…
- Most meteorites found on Earth are less than 1 meter in diameter. - Many meteorites are covered in small pits, and some even contain crystals.
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how do poets choose what structure to use for a poem? (1 point) based o…
A. based on the message they want to convey
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a poem that consists of 14 lines and uses a rhyme scheme of abab cdcd e…
D. a sonnet
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pregunta 10 1 pts identify the type of reaction: fecl₃ + ba(oh)₂ → fe(o…
Double replacement (la opción "Double replacement" es la correcta, ya que se trata de un intercambio de cationes y aniones entre dos compuestos, lo que define la reacción de doble…
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pregunta 9 1 pts identify the type of reaction: fe + h₂so₄ → feso₄ + h₂…
D. Single Replacement
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pregunta 8 1 pts identify the type of reaction: koh + hcl → kcl + h₂o c…
B. Double Replacement
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pregunta 7 1 pts identify the type of reaction: c₁₂h₂₂o₁₁ + o₂ → co₂ + …
A. Combustion
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pregunta 6 1 pts given the following reactants, predict which type of r…
Single Replacement (la opción "Single Replacement" es la correcta, ya que la reacción de Mg y HCl es un reemplazo simple donde el metal (Mg) reemplaza al hidrógeno en el ácido).
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pregunta 5 1 pts given the following reactants, predict which type of r…
C. Combustion, D. Synthesis
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pregunta 4 1 pts given the following reactants, predict which type of r…
B. Decomposition
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pregunta 3 1 pts given the following reactants, predict which type of r…
Synthesis
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pregunta 2 1 pts given the following reactants, predict which type of r…
C. Double Replacement
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pregunta 1 1 pts select whether the substance undergoes a chemical chan…
B. physical change
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pregunta 6 1 pts which of the following is true about the --> or —→ sig…
C. It is used to separate the reactants from the products when reading or writing an equation, D. It means "yields", E. It means "produces"
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pregunta 5 1 pts which of the following is true about the + sign in a c…
B. It means "reacts with" on the reactant side
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pregunta 4 1 pts which of the following statements are true about chemi…
B. Reactants are written on the left side of the equation; products are written on the right side. C. Reactants are the chemicals that react together. D. Products are the chemical…
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pregunta 3 1 pts what is a skeleton chemical equation? an equation that…
The correct option is: An unbalanced equation that shows the chemical formulas for all the reactants and products involved in a chemical reaction of a skeleton. (Note: The "of a s…
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pregunta 2 1 pts please select all the choices that are signs of a chem…
A. bubbling, B. a temperature change, C. formation of a solid, D. change in color
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pregunta 1 1 pt which of the following describes a chemical reaction? s…
B. a chemical bond is formed, C. a chemical bond is broken, D. a new chemical is formed
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pregunta 2 1 pts name: cr(po₄)₂ chromium (iii) phosphate chromium (vi) …
D. Chromium (VI) Phosphate
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pregunta 1 1 pts name: fe(oh)₃ iron (ii) hydrogen oxide iron (iii) hydr…
B. Iron (III) Hydroxide (suponiendo que la segunda opción es la correcta con ese texto; si la numeración de opciones es como se ve, la opción con "Iron (III) Hydroxide" es la corr…
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pregunta 10 1 pts give the formula for: lithium chlorate
$LiClO_3$
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a hydroelectric plant takes energy from water and turns it into electri…
C. The water particles initially have potential energy due to their position. This potential energy is transformed into kinetic energy due to the motion of energy and then the kin…
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pregunta 9 1 pts give the formula for: lithium perchlorate
$\boldsymbol{LiClO_4}$
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pregunta 8 1 pts give the formula for: calcium carbonate ca(co₃)₂ ca₂(c…
C. \(CaCO_3\)
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pregunta 7 1 pts give the formula for: potassium carbonate kco₃ kco k₂c…
C. $\text{K}_2\text{CO}_3$
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pregunta 6 1 pts give the formula for: calcium iodate ca(io3)2 ca(io3)2…
B. \(Ca(IO_3)_2\) (suponiendo que la segunda opción es la correcta con la notación \(Ca(IO_3)_2\))
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pregunta 4 1 pts name al(clo₃)₃
Aluminum Chlorate
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pregunta 3 1 pts name mg(clo₃)₂ ○ magnesium chlorite ○ magnesium chlora…
B. Magnesium chlorate
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pregunta 2 1 pts name rbc₂h₃o₂ rubidium carbohydrate rubidium acetate r…
B. Rubidium acetate
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pregunta 1 1 pts name mg(fo₃)₂ magnesium hyposulfite magnesium perfluor…
B. Magnesium perfluorate
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pregunta 10 1 pts write the formula for lithium phosphide.
\( \text{Li}_3\text{P} \)
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pregunta 9 1 punto ¿cuál sería la fórmula cuando el calcio reacciona co…
Ca3P2 (la opción "Ca3P2")
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pregunta 7 1 punto ¿cuál sería la fórmula cuando el calcio reacciona co…
B. CaBr2
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pregunta 7 1 punto ¿cuál sería la fórmula cuando el calcio reacciona co…
B. CaBr2 (suponiendo que la segunda opción es "CaBr2", ya que en la imagen se ve como "Calbr2" probablemente por error de escritura, pero la fórmula correcta es \( \text{CaBr}_2 \…
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pregunta 6 1 punto ¿cuál sería la fórmula cuando el litio reacciona con…
C. $\text{Li}_3\text{N}$
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pregunta 5 1 punto ¿cuál sería la fórmula cuando na⁺ reacciona con o⁻²?…
B. Na2O
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pregunta 3 1 punto ¿cuál sería la fórmula cuando ca ^+2 reacciona con o…
Ca2O2 (la tercera opción, suponiendo que la tercera es Ca2O2) ### Pregunta 4
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pregunta 2 1 punto ¿cuál sería la fórmula cuando cu⁺² reacciona con br⁻…
C. CuBr2
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consider the following equilibrium: 2no(g) + cl₂(g) ⇌ 2nocl(g) δg⁰ = -4…
s: 1. Under these conditions, the pressure of \( \text{Cl}_2 \) tends to **rise**. 2. Is it possible to reverse this tendency by adding NO? **Yes**. 3. The minimum pressure of NO …
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6. ammonia can be made by reaction of water with magnesium nitride as s…
C. 5.1 kg NH3
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6. ammonia can be made by reaction of water with magnesium nitride as s…
B. 1.18 × 10⁹
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consider the following equilibrium: 2nocl(g) ⇌ 2no(g) + cl₂(g) δg⁰ = 41…
s: 1. Under these conditions, the pressure of NOCl tends to **fall**. 2. Is it possible to reverse this tendency by adding NO? **Yes**. 3. Minimum \( P_{\text{NO}} \) needed: \( \…
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the number of protons in an atom determines the kind of atom, or elemen…
electrons ### Question 2
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which scale measures the acidity or alkalinity of a substance? a ph b m…
A. pH
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5. the following two reactions are important in the blast furnace produ…
A) 42.8 moles ### Question 6
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1. a mixture of kcl and kno₃ is 44.20% potassium by mass. the percentag…
A) 40% ### Question 2
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unit informed opinions through causal chains progress the movement of t…
C. Cities agree that Johnson’s latest album: Magnitude is his best work yet (assuming the options are labeled A, B, C, D with A being the first option, B the second, C the third, …
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mr. pauller chemistry 2 period name ideal gas law problems show your wo…
s: 1. Volume of Argon: \(\approx 35.1 \, \text{L}\) 2. Pressure of Nitrogen: \(\approx 4.08 \, \text{atm}\) 3. Moles of Chlorine: \(\approx 0.018 \, \text{mol}\) 4. Temperature of…
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which statement describes how a basic coffee cup calorimeter works? ○ i…
It uses the mass and specific heat of water along with a thermometer to measure the gain or loss of energy when a substance is added.
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which statement defines calorimeter? ○ a device that measures the heat …
A. a device that measures the heat that is gained or lost in a chemical change
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a sample of hexane (c₆h₁₄) has a mass of 0.580 g. the sample is burned …
27.7 kJ (corresponding to the option "27.7 kJ")
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the initial temperature of a bomb calorimeter is 28.50°c. when a chemis…
5,170 J (corresponding to the option with 5,170 J)
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prompt in 2 to 3 paragraphs, compare and contrast design methods used i…
Traditional animation uses hand-drawn cels and manual frame creation for organic textures; digital animation uses software, tweening, and reusable assets for efficiency. Both focu…
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using any data you can find in the aleks data resource, calculate the e…
\( \boxed{4.0\times 10^{-6}} \) (Note: The answer may vary slightly depending on the exact value of \( \Delta G_f^\circ(\text{H}_2\text{O}(l)) \) used, but with two significant di…
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paintings in museums have to be kept away from ultraviolet light. ultra…
C. Because the paint can take in energy from ultraviolet light but not from the light from the overhead lamps. (Assuming the options are labeled A, B, C, D with C being the third …
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wei saw a special type of plastic that would melt and become a liquid w…
The first option (the one with "Because the plastic can take in energy from the light from the sun but not from the light from the lamp.")
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dentists use a soft, clay - like material to make a filling for a cavit…
B. Because the filling material can take in energy from ultraviolet light, but not from the light from the lamp.
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malachi uses some glue to fix a broken plate. he puts the glue under a …
A. Because the glue can take in energy from the light from the sun but not from the light from the lamp.
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45 this diagram shows a growing trend that began to negatively affect t…
A. By establishing the Environmental Protection Agency to protect air and water
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when converting 26°c to °f, which of the following is the correct formu…
\(^{\circ}F=(1.8)\times(26^{\circ}C)+32\) (the third option in the given list)
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question 5 (2 points) based on his observation of a group of patients w…
B. inductive ### Question 6
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when 40.0 ml of 1.00 m h₂so₄ is added to 80.0 ml of 1.00 m naoh at 20.0…
4.62 kJ
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ionization energy electron affinity atomic radius nonmetallic character…
The image shows periodic table trends: Atomic radius decreases across a period (left to right, but the horizontal blue arrow is leftward, so from right to left, atomic radius incr…
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using any data you can find in the aleks data resource, calculate the e…
# Explanation: ## Step1: Find ΔG° for the reaction First, recall that \( \Delta G^\circ = \sum n\Delta G_f^\circ(\text{products}) - \sum m\Delta G_f^\circ(\text{reactants}) \). Fo…
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using any data you can find in the aleks data resource, calculate the e…
$\boxed{0.56}$ (or around 0.56, depending on precise $\Delta G_f^\circ$ values)
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using any data you can find in the aleks data resource, calculate the e…
\( 4\times10^{-31} \)
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explain the primary difference between the total kinetic energy graphs …
For Result 1 (Bond Breaks), the total kinetic energy graph likely shows a decrease (energy used for bond breaking). For Result 2 (Bond Does Not Break), the graph may show an incre…
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unit: exploring comparative elements progress the movement of the progr…
A. Compare and contrast organic farming and commercial farming, and explain why organic farming is healthier.
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which bond in a fuel molecule (octane or dodecane) is the combination o…
B. magnet marble
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when octane or dodecane reacts with oxygen to form water and carbon dio…
The reactant molecules (octane/dodecane and oxygen) must undergo bond breaking (the bonds within the reactant molecules must break) so that the atoms can rearrange to form the pro…
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why do you think we need to put energy into the cylinder system to get …
We need to put energy into the cylinder system to provide the activation energy required for the fuel - oxygen reaction to start, as chemical reactions (like fuel combustion) have…
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read the passage from chapter 5 of animal farm. at the meetings snowbal…
D. Both Snowball and Napoleon are persuasive leaders and clever animals.
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the emt is called to a residence for a 67-year-old patient that suddenl…
A. Transient ischemic attack
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step 1: draw the following lewis structures nf₃ f₂ step 2: list the int…
- **Lewis Structures**: \( \text{NF}_3 \): N (center) - single bonds to 3 F, N has 1 lone pair, each F has 3 lone pairs; \( \text{F}_2 \): \( \text{:F - F:} \) with 3 lone pairs o…
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passionate shepherd to his love christopher marlowe come live with me a…
D. Each line contains eight syllables, and there is an AABB rhyme scheme
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calculate the concentration of an hcl solution if 100.0 ml of the hcl r…
The concentration of HCl solution is \(\boxed{0.1320}\) M (corresponding to option W).
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calculate the $k_a$ for a monoprotic acid, hx, if a 0.100000 m solution…
1. U 2. U 3. U 4. V 5. U 6. U 7. X 8. V (And for the \(K_a\) value, it's approximately \(2.16\times10^{-6}\), matching option X)
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the decomposition of plants plays an important role in the carbon cycle…
- Coal contains the carbon that was once part of ancient plants. - The formation of coal takes hundreds of thousands of years. - Carbon can be stored deep underground as coal.
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calculate the ph and the $k_a$ for $hc_2h_3o_2$ if in a 1.0000 m soluti…
1. C 2. C 3. C 4. C 5. C 6. \( \approx 2.4 \) (or based on exact calculation \( -\log(0.0040) \approx 2.3979 \)) 7. Y 8. J 9. \( \approx 1.6\times 10^{-5} \) (or \( \frac{(0.0040)…
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start: \\ce{h2s} 1.000 m + 2 \\ce{h2o} \ ightleftharpoons 2 \\ce{h3o+} …
1. BB. 0.0077 2. EE. 1 3. BB. 0.0077 4. FF. 0.0154 5. BB. 0.0077 6. FF. 0.0154 7. BB. 0.0077 8. HH. \( 1.84 \times 10^{-6} \) 9. AA. 0.9923
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question 5 (1 point) write the equation for $k_{eq}$ for the following …
1. W. \(\text{CaF}_2(\text{aq})\) 2. X. \(\text{CO}_2\) 3. V. \(\text{HF}(\text{aq})\)
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question 4 (1 point) write the expression for the $k_a$ when $hc_2h_3o_…
For the numerator first blank (1): R. \( C_2H_3O_2^{-1} \) For the numerator second blank (2): C. \( H_3O^{+1} \) For the denominator blank (3): Q. \( HC_2H_3O_2 \) (In the format…
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write the expression for the $k_b$ for each of the following reactions …
\(_1\): O. \( \text{H}_2\text{CO}_3 \) \(_2\): J. \( \text{HCO}_3^{-1} \) \(_3\): H. \( \text{H}_2\text{PO}_4^{-1} \) \(_4\): G. \( \text{HPO}_4^{-2} \)
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tie it all together step 1: draw the following lewis structures hf\thcl…
### Step 1 Lewis Structures: - **HF**: H - F (F has 3 lone pairs) - **HCl**: H - Cl (Cl has 3 lone pairs) ### Step 2 Intermolecular Forces: - **HF**: Hydrogen Bonding, Dipole - Di…
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this ball-and-stick model shows a molecule of carbon dioxide, which has…
glucose (\(C_6H_{12}O_6\)), methane (\(CH_4\)), chloroform (\(CHCl_3\))
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4. h-cl: polar or nonpolar? forces present: 5. :cl: :cl-c-cl: :cl: pola…
Polar; Forces Present: London dispersion forces, dipole - dipole forces ### Problem 5 (CCl₄)
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red arrows pointing back towards earth. because this infrared radiation…
B. After infrared radiation is trapped in the atmosphere, the infrared radiation may be absorbed by other greenhouse gas molecules. C. Greenhouse gas molecules gain energy after a…
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intermolecular forces (imfs) thinking steps: 1. all molecules have lond…
Polar or nonpolar? Polar Forces present: London Dispersion Forces, Dipole - Dipole Forces, Hydrogen Bonds ### For Molecule 2: $\boldsymbol{CCl_4}$
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earths surface, the average temperature of earths surface is warmer tha…
B. Greenhouse gas molecules gain energy after absorbing infrared radiation. D. Greenhouse gas molecules absorb and release infrared radiation.
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the diagram below shows how greenhouse gases trap infrared radiation ne…
Absorbs IR radiation: carbon dioxide, methane, water vapor Does not absorb IR radiation: oxygen
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read the text. then answer the question. molecules of nitrogen (n₂) and…
\(400\)
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which type of energy do moving objects have? ○ chemical ○ electrical ○ …
C. kinetic
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1. what is a variable in an experiment? a something that might change b…
A. Something that might change A. Solid, C. Liquid, D. Gas B. By combining 2 or more substances A. Solute
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proposed multiplication or division | is this possible? | result (3.0 m…
First row: Is this possible? $\boldsymbol{\text{yes}}$, Result: $\boldsymbol{5.1 \times 10^{-5} \, \text{g}^2}$ (or $\boldsymbol{51 \, \text{mg}^2}$) Second row: Is this possible?…
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read this excerpt from a passage and the references entry for the sourc…
This source is not credible because anyone can post or edit information on Wikipedia, whether or not they have expertise in the subject.
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piles of coal at a power plant complete the sentence. when fossil fuels…
When fossil fuels burn, much of the energy is in the form of heat. Then, this heat energy moves a machine called a turbine, which spins a generator to create electricity.
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the decomposition of plants plays an important role in the carbon cycle…
- B. Carbon can be stored deep underground as coal. - C. Coal contains the carbon that was once part of ancient plants. - D. The formation of coal takes hundreds of thousands of y…