Homework: Solubility and Rate of Dissolving

Answer:

La clorofila capta la energía luminosa del sol. (verdadero) La fotosíntesis degrada las sustancias orgánicas que nesecitas las células(falso)

Explanation:

La clorofila es la encargada de dar el pigmento de color verde en las plantas y la que transforma la energia luminica en energia quimica, es por eso que es verdadera.

La fotosintesis NO degrada las sustancias organicas, sino que transforma un sustrato inorganico en una fuente energetica organica para las plantas.

Esto se debe por que las plantas o vegetales son autonomas, es decir que se autoabastecen energeticamente sin necesidad de ingerir alimentos como en el caso de los mamiferos.

Answer:

Aluminium is ordinarily classified as a metal. It is lustrous, malleable and ductile, and has high electrical and thermal conductivity. Like most metals, it has a close-packed crystalline structure and forms a cation in an aqueous solution.

A resistor is shown with a zig zag, so D is the resistor

Answer:

letter D

Explanation:

letter A represent the battery

letter B represent the key

letter C represent nothing

letter D represent the resistance

On the basis of electronegativity,  Na and K is most likely to form monatomic ions.

A monatomic ion is an ion that is made of more than one atom and is from an element like calcium consisting of Ca²+ and a polyatomic ion that is Co²/³.

Many elements such as hydrogen, lithium, sodium, potassium, and magnesium consist of positively charged ions.

Other like fluoride, chlorine, and iodine, and hydride consist of negatively charged ions.

Ba and Ca form diatomic ions.

Thus the correct option is Na and Cl which is sodium and potassium.

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The three industries commonly associated with battery technology are the automotive, electronics, and renewable energy sectors. Each of these industries faces specific challenges when it comes to developing better batteries.

Automotive Industry:

Electronics Industry:

Renewable Energy Industry:

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The concentration of Ca(OH)2 in the solution is approximately 1.33 x 10^(-6) M.

To find the concentration of Ca(OH)2 in a solution with a pH of 8.57, we need to use the concept of pOH, which is the negative logarithm of the hydroxide ion concentration ([OH-]). The pOH can be calculated by subtracting the pH from 14, which gives us 14 - 8.57 = 5.43.

Since Ca(OH)2 produces two OH- ions for every molecule of Ca(OH)2 that dissolves, the concentration of OH- ions will be twice the concentration of Ca(OH)2. Thus, we have [OH-] = 2x, where x represents the concentration of Ca(OH)2.

Taking the antilogarithm of the pOH, we find that [OH-] = 10^(-pOH) = 10^(-5.43).

Since [OH-] = 2x, we can write 2x = 10^(-5.43) and solve for x.

x = (10^(-5.43))/2 ≈ 1.33 x 10^(-6) M

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All the oxides and hydroxides of metals are basic in nature.

Magnesium oxide is also basic in nature and is a water insoluble base.

When a dilute acid reacts with a base it forms salt and water because the acidity and basicity of the acid and base respectively neutralise each other.This process is known as neutralisation reaction.

When MgO reacts with HCl it forms MgCl2 and water.

In equation form

MgO + 2HCl — MgCl² + H2O

Answer:

it's definitely a oxidation reaction because here the oxygen contained OH group present in yeild

Answer:

perform multiple trials for each release height instead of just one

Explanation:

Answer:

a) The predominant Brownstead-Lowry acid- base is perchloric acid

b) A conjugate acid base pair is HClO4 and ClO4^-

c) forward reaction is favored and equilibrium position lies towards the far right

Explanation:

The molecular equation is;

HClO4(aq) + NaH2PO4(aq) -----> H3PO4(aq) + NaClO4(aq)

The net ionic equation of the reaction is;

H^+(aq) + H2PO4^-(aq) ----> H3PO4(aq)

The predominant Brownstead-Lowry acid- base is perchloric acid .

A conjugate acid base pair is HClO4 and ClO4^-

Since the both species; perchloric acid and sodium dihydrogen phosphate are both highly soluble in water yielding ions and also dissociate to a large extent in solution, the forward reaction is favoured leading to the formation of phosphoric acid. Remember that phosphoric acid does not easily dissociate in solution hence the forward reaction is faster than the reverse reaction and the equilibrium position lies towards the far right.

Coulomb's law can be applied qualitatively to describe the interactions of ions before they dissociate and the attractions between ions and the solvent after the solution forms.

Coulomb's law states that the force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Before dissociation, ions in a solid are strongly attracted to each other due to their opposite charges. The positive and negative ions are held together in a crystal lattice by electrostatic forces governed by Coulomb's law.

The strength of the attraction depends on the magnitude of the charges and the distance between them.

After the solution forms, when the solid dissolves in a solvent, the ions separate and become surrounded by solvent molecules.

The solvent molecules interact with the ions, creating attractive forces between them. These attractive forces between the ions and the solvent are also described by Coulomb's law.

The magnitude of the charges and the distance between the ions and the solvent molecules determine the strength of the attractions.

In summary, Coulomb's law can be used to explain the interactions between ions before they dissociate in a solid and the attractions between ions and the solvent after the solution forms.

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Answer: a)Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

b) Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

c) Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Explanation:

(a) Balanced formula equation:

(NH₄)₂S + FeSO₄ → (NH₄)₂SO₄ + FeS

Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

(b) Balanced formula equation:

Na₂SO₃ + CaCl₂ → NaCl + CaSO₃

Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

(c) Balanced formula equation:

CuSO₄ + BaCl₂ → CuCl₂ + BaSO₄

Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

HFO-1234yf has been tested and found compatible with  PAG oil.
The correct answer is option A. PAG oil

PAG oil, or Polyalkylene Glycol, is a fully synthetic hygroscopic oil specifically designed for automotive air conditioner compressors. It is used in R-134a air conditioning systems to lubricate the compressor. When looking at PAG oil you will notice various numbers such as PAG46 or PAG100. These numbers refer to the viscosity of the oil, similar to 10W30 oil. In order to determine the correct PAG viscosity for your vehicle you will need to look up the specifications of your make and model of your vehicle either online or in the instruction manual.

Hence, HFO-1234yf is compatible with PAG oil. It is not compatible with mineral oil, hydraulic oil, or all of the items listed.

The correct answer is option A. PAG oil.
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An old sandwich going bad in the garbage and baking an apple pie are two examples of chemical reactions, which they both share.

Baking soda and vinegar producing carbon dioxide, iron rusting, and wood burning are a few examples of chemical changes. The metabolization of food and the production of amylase from the combining of sugar and saliva are only two examples of the many chemical processes that the body produces.

A chemical change occurs when the molecules that make up two or more compounds are rearrange to form a new substance. When you bake, you start with a range of ingredients.

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The volume of a gas is 605 liters at 27.0°C and the new temperature is -3.0°C, so the resultant volume of the sample is 544.53L.

Relation between the volume and temperature of the sample of gas is represented by the ideal gas equation PV = nRT, and for the question required equation is:

V₁/T₁ = V₂/T₂, where

V₁ & T₁ are the initial volume and temperature of the gas.

V₂ & T₂ are the final volume and temperature of the gas.

On putting values from the question on the above equation and by converting temperature into Kelvin, we get

V₂ = (605)(270.15) / (300.15) = 544.53 L

Hence required volume of the sample is 544.53L.

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Answer:

5000 cal X 4.184 J/cal =

Explanation:

20,920 jules

Answer: The concentration of hydrogen ions in the given solution is \(6.2 \times 10^{-4}\).

Explanation:

Given : pH = 4.32

pH of a substance or solution is the negative logarithm of hydrogen ion concentration.

\(pH = - log [H^{+}]\)

Substitute the value into above formula as follows.

\(pH = - log [H^{+}]\\= - log (4.32)\\= 6.2 \times 10^{-4}\)

Thus, we can conclude that the concentration of hydrogen ions in the given solution is \(6.2 \times 10^{-4}\).

The molecule which would have the highest boiling point is 2-methylhexane. Thus, the correct option will be D.

The boiling point is the temperature at which the vapor pressure of a liquid is equal to the external pressure. The boiling point of a liquid is a measure of its vapor pressure. The higher the boiling point, the higher the vapor pressure of the liquid, and the more heat is required to vaporize it.

The boiling point of a substance is affected by the strength and types of intermolecular forces. The stronger the intermolecular forces, the higher the boiling point. 2-methylhexane has highest boiling point because it has the highest number of carbons and branches, which contribute to its strong intermolecular forces that lead to a higher boiling point.

Therefore, the correct option is D.

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a) 107.1 g of hydrosulfric acid can be formed.

b) Aluminium sulfide is the limiting reactant.

c) 378g of excess reactant remains.

d) 52.75 % is the percent yield.

The limiting reactant or limiting reagent is a reactant in a chemical reaction that determines the amount of product that is formed.

Identification of the limiting reactant can help calculate the theoretical yield of a reaction.

Given the reaction,

2Al₂S₃ + 6 H₂O = 2Al(OH)₃ + 3H₂S

Mass of aluminium sulfide = 316g

Mass of water = 493 g

Moles = Mass ÷ molar mass

Moles of Aluminium sulfide = 316 ÷ 150

=  2.10 moles

Moles of water = 493 ÷ 18

= 27.3 moles

Since moles of aluminium sulfide is less, it is the limiting reagent.

From the reaction, 2 moles of aluminium sulfide gives 3 moles of H₂S.

1 moles of Al₂S₃ will give 3 ÷ 2 moles of H₂S.

Thus, 2.1 moles of Al₂S₃ will give 1.5 × 2.1 moles

                                 = 3.15 moles of H₂S

Mass of H₂S = Moles × molar mass

                                  = 3.15 × 34 = 107.1 g

From the reaction, 2 moles of aluminium sulfide gives 6 moles of H₂O.

1 mole will need 3 moles of water.

Thus, 2.1 moles will need 3 × 2.1 moles = 6.3 moles of water

Excess of water = 27.3 - 6.3 = 21 moles

Mass of excess reactant = 21 × 18 = 378g

Actual yield of  H₂S = 203g

Theoretical yield = 107.1 g

% yield = (107.1 × 100) ÷ 203 = 52.75 %

Therefore,

a) 107.1 g of hydrosulfric acid can be formed.

b) Aluminium sulfide is the limiting reactant.

c) 378g of excess reactant remains.

d) 52.75 % is the percent yield.

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The wavelength of light with a frequency of 4.36 x 10^15 Hz is approximately 68.9 nanometers.

To calculate the wavelength of light in nanometers, we can use the formula:

wavelength = speed of light/frequency

The speed of light is approximately 3.00 x 10^8 meters per second. We need to convert the frequency of 4.36 x 10^15 Hz to Hz. Thus,

wavelength = (3.00 x 10^8 m/s) / (4.36 x 10^15 Hz)

Simplifying this expression, we get:

wavelength = 0.0689 x 10^-6 m = 68.9 x 10^-9 m

Finally, we convert meters to nanometers by multiplying by 10^9:

wavelength = 68.9 x 10^-9 m x 10^9 nm/m

wavelength = 68.9 nm

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The bond order of the N-O bonds in nitrosyl fluoride (NOF) is 1.5.

Bond order refers to the number of chemical bonds present between two atoms in a molecule. It is calculated based on the number of electrons involved in bonding and can range from zero to a maximum of 3 for a covalent bond.

In nitrosyl fluoride (NOF), the nitrogen (N) atom and the oxygen (O) atom are joined by a single covalent bond, which involves the sharing of two electrons. However, the bond is not a simple single bond, but rather a resonance hybrid of two contributing structures, both of which have a bond order of 1.5. This results in a bond order of 1.5 for the N-O bond in nitrosyl fluoride.

The concept of bond order is important because it provides insight into the stability of a molecule and helps to predict the bond lengths and strengths of the bonds in the molecule.

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Answer:

it would be 5,045

Explanation:

because it is closer to 5,000. pls correct me if wrong

Answer:

YEESSS

Explanation:

Because that seems like the only logical answer.

Answer:

YES

Explanation:

YES

Answer:

A chain of volcanic

Explanation:

Answer:

A

Explanation:

The order of increasing strength of intermolecular forces of the following compounds is F2 < CO2 < NH2CH3.

Describe intermolecular forces.

The term “Intermolecular forces” is utilized to describe the forces of attraction between atoms, molecules, and ions when they are placed close to one another.

Strongest due to the hydrogen bonds is NH2CH3 (other bonds are present but the Hydrogen bonds are key as it has the strongest attraction.

Due to Dipole-Dipole attraction and London dispersion intermolecular forces, CO2 is the second-strongest gas.

Only dispersion forces seem to be at effect because F2 is the weakest and nonpolar.

Therefore, the order of increasing strength of intermolecular forces of the following compounds is F2 < CO2 < NH2CH3.

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Answer:

110 degrees C

Explanation:

110 degrees

is your answer

Taking into account the reaction stoichiometry, 9 moles of CO₂ and 13.5 grams of H₂O are formed if 4.50 mol of ethane undergo combustion.

In first place, the balanced reaction is:

2 C₂H₆ + 7 O₂  → 4 CO₂ + 6 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The following rule of three can be applied:

moles of CO₂= (4.50 moles of C₂H₆×4 moles of CO₂)÷ 2 moles of C₂H₆

moles of CO₂= 9 moles

moles of H₂O= (4.50 moles of C₂H₆×6 moles of H₂O)÷ 2 moles of C₂H₆

moles of H₂O= 13.5 moles

Finally, 9 moles of CO₂ and 13.5 grams of H₂O are formed.

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