The rate law for the reaction 3A --> 2B is rate = k[A] with a rate constant of 0.0447 hr-1.
What is the half-life of the reaction?
A) 0.0224 hr
B) 0.0645 hr
C) 15.5 hr
D) 22.4 hr
E) 44.7 hr

Answer:

655

Explanation:

using bodmas, (bracket first), 8.81-7.50=1.31

1.31÷0.0020=655

Answer:

Nitrite

Explanation:

Nitrous Oxide = N₂O

Nitrite = NO₂

Ammonia = NH₃

Nitrate = NO₃⁻

Answer:

The wavelength of a photon with an energy of 4.56×10⁻¹⁹ J is 463nm (nanometer)

Define the wavelength of a photon.

Each photon has a wavelength and a frequency. The wavelength is defined as the distance between two peaks of the electric field with the same vector.

A photon is the smallest element of electromagnetic radiation. You can think of a photon as a packet of energy travelling at the speed of light. There is no constant wavelength of a photon, it is dependent on how much energy the photon carries.

The mathematical relationship can be written as

E=hc/ λ

In terms of wavelength,

λ=hc/E

- h is planks constant

- c is the speed of light

- E is the energy of the photon

Where h = 6.626×10⁻³⁴ J⋅s is Planck’s constant and c = 3×10⁸ m/s is the speed of light.

If E = 4.56×10⁻¹⁹ J then λ = 463nm (nano meter)

Hence, the wavelength of a photon with an energy of 4.56×10⁻¹⁹ J is 463nm(nanometer)

Hope its helpful!

Answer:

The wavelength of a photon with an energy of 4.56×10⁻¹⁹ J is 463nm (nanometer)

Define the wavelength of a photon.

Each photon has a wavelength and a frequency. The wavelength is defined as the distance between two peaks of the electric field with the same vector.

A photon is the smallest element of electromagnetic radiation. You can think of a photon as a packet of energy travelling at the speed of light. There is no constant wavelength of a photon, it is dependent on how much energy the photon carries.

The mathematical relationship can be written as

E=hc/ λ

In terms of wavelength,

λ=hc/E

- h is planks constant

- c is the speed of light

- E is the energy of the photon

Where h = 6.626×10⁻³⁴ J⋅s is Planck’s constant and c = 3×10⁸ m/s is the speed of light.

If E = 4.56×10⁻¹⁹ J then λ = 463nm (nano meter)

Hence, the wavelength of a photon with an energy of 4.56×10⁻¹⁹ J is 463nm(nanometer)

Answer:

Empirical: NO2. Molecular: N2O4

Explanation:

In order to determine the empirical formula, we divide each element's mass by their respective molar mass:

N: 0.3955g/14.01 g/mol = 0.02823 mol

O: 0.904g/16.00 g/mol = 0.0565 mol

Next, we take the smallest value and multiply it till it is close enough to an integer:

0.02823 x 40 = 1.12 Close enough to 1.

0.0565 x 40 = 2.26. Close enough to 2.

Therefore, the Empirical Formula is: NO2

Next, we determine how much the Empirical formula weighs and see if it matches 92g/mol:

14.01 g/mol + 2(16.00 g/mol) = 46.01 g/mol

We can assume this is roughly half of 92 g/mol so we can multiply each subscript by 2 to match the weight.

Therefore, the Molecular formula is N2O4

Hope this helped!

Answer:

D.) C₂H₃O₂⁻ (aq) + H⁺ ---> HC₂H₃O₂

Explanation:

The net ionic equation shows the compounds/elements that directly involved in the reaction. These substances can be determined depending on where and how many times they appear in the equation. If the compounds/elements appear on both the reactants and products side of the equation, they will not be found it the net ionic equation.

Expanded Equation:

Na⁺ + C₂H₃O₂⁻ (aq) + H⁺ + Cl⁻ ---> Na⁺ + Cl⁻ + HC₂H₃O₂

Net Ionic Equation:

C₂H₃O₂⁻ (aq) + H⁺ ---> HC₂H₃O₂

Therefore, since Na⁺ and Cl⁻ are located on both sides, they are eliminated. This leaves only the C₂H₃O₂⁻ (aq), H⁺, and HC₂H₃O₂ left in the net ionic equation.

Answer:

The composition of Mg(OH)2 is

41.67 % Mg,

54.87 % O

3.457 % H

Explanation:

Thats the percent composition for each one in your question

Answer:

Hello! The answer to your question is:

Mg: 41.68%

O2: 54.86%

H2: 3.46%

Explanation:

We need to find the percent composition of each element, so first, we need to find the molar mass. This is calculated by using the number underneath the element. The "2" outside of the parentheses is distributed to Oxygen and Hydrogen as well-meaning that you multiply the number by 2:

Mg: 24.31 g/mol

O2: 16.00 × 2 = 32.00 g/mol

H2: 1.01 × 2 = 2.02 g/mol

Now, we have to add up the molar mass of each element:

24.31 g/mol + 32.00 g/mol + 2.02 g/mol = 58.33

To find the percent composition of each element, you have to divide the molar mass of each element by the total molar mass:

Mg: [tex]\frac{24.31 g/mol}{58.33 g/mol} \\= 41.68 percent[/tex]

O2: [tex]\frac{32.00 g/mol}{58.33 g/mol} \\= 54.86 percent[/tex]

H2: [tex]\frac{2.02 g/mol}{58.33 g/mol} \\= 3.46 percent[/tex]

The percent composition of each element is:

Mg: 41.68%

O2: 54.86%

H2: 3.46%

2.54 × 10⁵ kJ of heat are required to fully melt a 0.834 m³ block of ice, with a density of 917 kg / m³.

Melting is a physical change in which solids turn into liquids.

We have a block of 0.834 m³ of ice with a density of 917 kg/m³.

0.834 m³ × 917 kg/m³ = 765 kg = 7.65 × 10⁵ g

We will use the molar mass of water.

7.65 × 10⁵ g × (1 mol/18,02 g) = 4.24 × 10⁴ mol

According to the thermochemical equation, 6.01 kJ are required to melt 1 mol of water.

4.24 × 10⁴ mol × (6.01 kJ/mol) = 2.54 × 10⁵ kJ

2.54 × 10⁵ kJ of heat are required to fully melt a 0.834 m³ block of ice, with a density of 917 kg / m³.

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Answer:

B

Explanation:

FUN is not building block of matter.

The true statement about this chemical reaction is that: D. the change in enthalpy is +180 kJ, so it is an endothermic reaction.

In order to determine whether this chemical reaction is endothermic or exothermic, we would determine the change in enthalpy as follows:

The change in enthalpy = The energy of products - the energy of reactants

Substituting the given parameters into the formula, we have;

The change in enthalpy = -240 - (-420)

The change in enthalpy = -240 + 420

The change in enthalpy = 180 kJ.

Since the change in enthalpy for this chemical reaction, we can infer and logically conclude that it is an endothermic reaction because heat is absorbed.

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Complete Question:

The table shows the thermodynamic data for a reaction.

Thermodynamic Data:

Energy of the Reactants: -420 kJ

Energy of the Products: -240 kJ

Activation Energy: -310 kJ

Which of the following statements explains if the reaction is endothermic or exothermic?

The activation energy is lower than the change in enthalpy, so it is an exothermic reaction.

B. The activation energy is higher than the change in enthalpy, so it is an endothermic reaction.

C. The change in enthalpy is -180 kJ, so it is an exothermic reaction.

D. The change in enthalpy is +180 kJ, so it is an endothermic reaction.

Answer:

Frequency of the wave = 8.33  × 10¹⁶  Hz

Explanation:

• We can use the wave equation to solve this problem:

v = f λ

where:

v = velocity of wave (3.0 × 10⁸ m/s)

f = frequency of wave (?)

λ = wavelength of wave (3.6 × 10⁻⁹ m)

• Substituting these values into the equation:

3.0 × 10⁸  =  f   ×  3.6 × 10⁻⁹

f = (3.0 × 10⁸) ÷ (3.6 × 10⁻⁹)

f = 8.33  × 10¹⁶  Hz

Samantha wanting her team however she needs to make a decision to feel excited about compounding a new medication is ideal.

This is the process of changing or mixing ingredients in order to suit the needs of an individual.

This technique should be best employed so as to ensure prompt and accurate treatment of her illness.

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Mercury and carbon two electrodes can't be used with an inactive or inert material.

The electrode is the element which is used to complete the electric circuit in welding. Some time electrode is connected with the positive terminal and sometimes with a negative terminal, it depends on the requirement of the welding process.

Inert electrode is an electrode that serves only as a source or sink for electrons without playing a chemical role in the electrode reaction. Precious metals, mercury, and carbon are typically used as inert electrodes.

Therefore, neither of the two electrodes can be used with an inactive or inert material.

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According to the law of conservation of mass 1.7 grams of [tex]O_2[/tex] will be formed.

A mole is defined as 6.02214076 × 1[tex]0^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

[tex]2HgO[/tex]→ [tex]2Hg + O_2[/tex]

According to the laws of conservation mass of reactants should be equal to the mass of products.

23.5 grams - 21.8 grams

1.7 grams of [tex]O_2[/tex] will be formed.

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Answer:

a.) pH = 3.62

b.) pOH = 10.38

c.) [OH⁻] = 4.17 x 10⁻¹¹

Explanation:

The hydronium ion concentration can be represented by the symbol: [H₃O⁺]. The hydroxide ion concentration can be represented by the symbol: [OH⁻].

a.) The pH of a solution represents the hydrogen (hydronium) ion concentration. It can be calculated using the following formula:

pH = -log[H₃O⁺]

Since you have been given the hydronium concentration, you can easily find the pH.

[H₃O⁺] = 2.4 x 10⁻⁴

pH = -log[2.4 x 10⁻⁴]

pH = 3.62

b.) The pOH of a solution represents the hydroxide concentration. It measures the opposite of the pH measurement. Since the pH range goes up to 14, you can find the pOH using the following formula:

pOH + pH = 14

Since you now know the value of the pH, you can plug it into the formula to find the pOH.

pOH + 3.62 = 14

pOH = 10.38

c.) You can find the hydroxide concentration using the following formula:

[OH⁻] = 10^-pOH

Since you now know the value of the pOH, you can plug it into the formula to find the hydroxide concentration.

[OH⁻] = 10⁻¹⁰°³⁸

[OH⁻] = 4.17 x 10⁻¹¹

The possible structure of the compound is structure 2.

The full question is shown in the image attached to this question. Now we know that the central atom is sulfur and there are five regions of electron density around the central atom.

Now, we know that the structure is based on a trigonal bipyramid. Let the structure at the RHS be structure 1 and the structure at the LHS be structure 2.

For structure 1;

For structure 2;

Hence, the possible structure of the compound is structure 2.

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Answer:

The balanced equation of H2 + Cl2 —-> HCl is 2H2 + 2Cl2 —-> 2HCl.

Explanation:

In a chemical reaction, the number of atoms of each element must be the same on both sides of the equation. In this case, there are two atoms of hydrogen on the left side and two atoms of chlorine. On the right side, there is one atom of hydrogen and one atom of chlorine. In order to balance the equation, we must add another chlorine atom to the right side so that there are two atoms of chlorine on both sides of the equation. The final balanced equation is 2H2 + 2Cl2 —-> 2HCl.

Answer:

109.988623 Pounds or 49.89kg

Explanation:

Answer:

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Explanation:

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The greater, the ionic property, the greater will be solubility. water is a covalent compound where calcium carbonate is ionic that's why the solubility of [tex]CaCO_{3}[/tex](s) would be greater.

The capability of a substance, the solvent, to combine with another substance, the solvent, has been known as solubility. Insolubility, or just the solute's inability to create that kind of a solution, would be the opposite attribute.

Ionic chemicals dissolve readily in just about any liquid that has the ability to rupture the ionic link present in them. Since water itself has a stronger ionic bond and is still polar in nature, water disrupts the ionic link by hydrogen bonding. Several other solvents, like kerosene and gasoline, are unable to dissolve the ionic bond.

The greater, the ionic property, the greater will be solubility. water is a covalent compound where calcium carbonate is ionic that's why the solubility of [tex]CaCO_{3}[/tex](s) would be greater in distilled water than in tap water that contains 50 mg/L of calcium ions

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The  Percent yield of  soap is 17.8%

Percent yield is given as follows:

The actual yield of soap = 6.2 g

The expected yield is determined from the equation of the reaction.

The equation of the reaction is given as follows:

NaOH + CH₃(CH₂)₁₄COOH ----> CH₃(CH₂)₁₄COONa + H₂O

Molar mass of (palm kernel oil) CH₃(CH₂)₁₄COOH = 256 g/mol

Molar mass of NaOH = 40 g/mol

Molar mass of (soap) CH₃(CH₂)₁₄COONa = 278 g/mol

Mass of palm kernel oil = 9.9 g

Expected mass of soap = 5/40 * 278 = 34.75 g

Percent yield = 6.2/34.75 * 100 = 17.8%

Therefore, the Percent yield of  soap is 17.8%

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Answer:

The pH of the solution is 2.873

Explanation:

Given:

Let the solution of the uric acid be HA. We have to set up the ICE table as follows;

        HA(aq) + H20(l)  ⇄ H3O^+(aq)  + A^-

I         0.0140                       0                 0

C       -x                                +x                +x

E    0.0140 - x                      x                   x

Ka = 10^-(pka)

    = 10^-3.89

    = 1.28 x 10^-4

Ka = [H+] * [A-]/[HA]

=> 1.28 x 10^-4 = [H+]^2 / 0.0140

=>[H+]^2 = 1.28 x 10^-4 x 0.014

=> [ H+] = 1.338656 x 10^-3

so pH = - log [ H+ ] =  - log  1.338656 x 10^-3

= 3 - log 1.338656

= 2.87333101111

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Answer:

2.07

Explanation:

1870=(20.01)(c)(45.2)

1870 = 904.452c

c = 2.07 J/g C (to 3 sf]

The combustion reaction mentioned follow the model of the combustion reactions as illustrated in the information about the hybrid vehicles.

It should be noted that the comparison between the decrease in HC emissions and the blended fuels shows that methanol is more effective than ethanol.

The lowest emissions are obtained with methanol-blended fuel. When more combustion is complete, it will result in lower emissions.

Anyone in my family do not own a hybrid vehicle and I didn't have any other experience with a hybrid vehicle. Hybrid electric vehicles are powered by an internal combustion engine and one or more electric motors, that uses energy stored in batteries.

A hybrid electric vehicle cannot be plugged in to charge the battery but rather, the battery is charged through regenerative braking and by the internal combustion engine.

When the technology improves, and the price comes down, I will be interested in purchasing an alternative fuel vehicle.

The government should play in influencing consumers to purchase hybrid vehicles by offering tax credits and giving incentives.

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Answer:

1.) 2 Fe (s) + 3 Cl₂ (g) ---> 2 FeCl₃ (aq)

2.) 2.0 moles FeCl₃

3.) 0.67 moles FeCl₃

4.) 1.5 g FeCl₃

Explanation:

1.)

The unbalanced reaction:

Fe (s) + Cl₂ (g) ---> FeCl₃ (aq)

Reactants: 1 iron, 2 chlorine

Products: 1 iron, 3 chlorine

The balanced reaction:

2 Fe (s) + 3 Cl₂ (g) ---> 2 FeCl₃ (aq)

Reactants: 2 iron, 6 chlorine

Products: 2 iron, 6 chlorine

2.)

To find moles FeCl₃, you need to multiply the given value by the mole-to-mole ratio of Fe to FeCl₃. This ratio is constructed via the coefficients from the balanced equation.

2.0 moles Fe          2 moles FeCl₃
---------------------  x  ------------------------  = 2.0 moles FeCl₃
                                 2 moles Fe

3.)

To determine how much FeCl₃ is produced, you need to identify the limiting reagent. To find it, you need to convert both reactants to the product then identify which reactant gives you the smallest amount of product. This reactant is the limiting reagent and will give you your actual answer.

1.0 mole Fe         2 moles FeCl₃
-------------------  x  -----------------------  = 1.0 moles FeCl₃
                               2 moles Fe

1.0 mole Cl₂         2 moles FeCl₃
-------------------  x  ------------------------  = 0.67 moles FeCl₃
                              3 moles Cl₂

4.)

Because Cl₂ is the limiting reagent, we need to convert grams Cl₂ to grams FeCl₃. This can be done using the molar masses of both compounds and the mole-to-mole ratio.

Molar Mass (Cl₂): 2(35.453 g/mol)

Molar Mass (Cl₂): 70.906 g/mol

Molar Mass (FeCl₃): 55.845 g/mol + 3(35.453 g/mol)

Molar Mass (FeCl₃): 162.204 g/mol

1.0 g Cl₂          1 mole             2 moles FeCl₃         162.204 g
-------------  x  -----------------  x  -----------------------  x  ------------------  =  1.5 g FeCl₃
                      70.906 g            3 moles Cl₂              1 mole

The magnesium atom looses two electrons which are accepted by each of the fluorine atoms. (Option D).

An ionic bond is formed when two ions are formed by the loss or gain electrons. In this case, magnesium has to loose two electrons while fluorine will gain two electrons.

Thus, the correct steps in the formation of an ionic bond between these atoms are A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a +2 ion → Each fluorine atom becomes a -1 ion (Option D).

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Answer:

What is 18 electron rule?

:- The 18-electron rule is a chemical rule of thumb used primarily for predicting and rationalizing formulas for stable transition metal complexes, especially organometallic compounds.

Explanation:

A few common examples of exceptions to 18 electron rules include: 16-electron complexes: The metal center is usually low-spin and is in d8 configuration. These complexes adopt square planar structure, such as Rh(I), Ni(II), Pd(II), and Pt(II) complexes.

Hope its helpful!

Answer:

What is 18 electron rule?

:- The 18-electron rule is a chemical rule of thumb used primarily for predicting and rationalizing formulas for stable transition metal complexes, especially organometallic compounds.

Explanation:

A few common examples of exceptions to 18 electron rules include: 16-electron complexes: The metal center is usually low-spin and is in d8 configuration. These complexes adopt square planar structure, such as Rh(I), Ni(II), Pd(II), and Pt(II) complexes.

Explanation:

The electronic configuration of organic compounds depends on the orbitals of their atoms and molecules.

The expression 'electronic configuration' makes reference to the spacial arrangement of electrons in distinct energy orbitals of an atom/molecule.

The orbitals are designed with numbers and letters, whereas the amount of electrons in each orbital is expressed as superscripts (e.g., 1s² 2s² 2p² in the C atom that form glucose).

In conclusion, electronic configuration of organic compounds depends on the orbitals of their atoms and molecules.

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Answer:

1.915 x 10²³ atoms Pb

Explanation:

To find the amount of atoms, you need to (1) convert grams to moles (via atomic mass of lead) and then (2) convert moles to atoms (via Avogadro's Number). It is important to arrange the conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 4 sig figs to match the given value (65.89 g).

Atomic Mass (Pb): 207.20 g/mol

Avogadro's Number:

6.022 x 10²³ atoms = 1 mole

65.89 g Pb           1 mole             6.022 x 10²³ atoms
------------------  x  ----------------  x  -------------------------------  =  1.915 x 10²³ atoms Pb
                            207.20 g                  1 mole

Answer:

change of state

Explanation:

Change of state   ....  like ice changing state to water ....or water chaging state to steam  

Answer:

Attached Below

Explanation: