Which of these is an example of something a civil engineer deals with?
A. The wings on an airplane
B. A steel crane that can lift heavy objects
C. The sewage system in a neighborhood
D. A gauge that reads the force of an explosion

The reaction has not yet started, and the time required for 16.8% of the reactant to remain cannot be calculated using the given rate constant.

Given,The rate constant for this first-order reaction is 0.0830 s−1 at 400 ∘C.A⟶products After how many seconds will 16.8% of the reactant remain-The time taken for a first-order reaction to reach a particular percentage of completion can be calculated using the following formula:t = (ln(A/A₀))/kwhere A₀ is the initial concentration of the reactant, A is the concentration of the reactant at a given time, k is the rate constant, and t is the time elapsed since the reaction began.In this question, we are given the rate constant, k = 0.0830 s−1 at 400 ∘C, and we want to find out the time required for 16.8% of the reactant to remain.Let's assume that the initial concentration of the reactant is 100 units (we can assume any value as it does not affect the percentage of completion).Therefore, the concentration of the reactant remaining after 16.8% of completion would be: A = 16.8 units.Substituting these values in the above formula, we get:t = (ln(16.8/100))/0.0830t = (−1.7918)/0.0830t = −21.58 sThis time value is negative, which means that the reaction has not even started yet. Therefore, we need to check the given percentage of completion.

If it is less than 50%, we can assume that the reaction has not yet started. In this case, the percentage of completion is 16.8%, which is less than 50%.

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The value of the expression 22 - 80% for one month can be calculated as follows:22 - 0.8 * 22 = 22 - 17.6 = 4.4Rounding off 4.4 to two decimal places gives 4.40.So, the answer to the expression 22 - 80% rounded to two decimal places is 4.40

.The value of the expression 2212% for one month can be calculated as follows:2212/100 = 2.64Rounding off 2.64 to two decimal places gives 2.64.

So, the answer to the expression 2212% rounded to two decimal places is 2.64.The value of the expression 95.00% for one month can be calculated as follows:95.00/100 = 0.95Rounding off 0.95 to two decimal places gives 0.95.So, the answer to the expression 95.00% rounded to two decimal places is 0.95.

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Answer:

540.47g approximately

Explanation:

No. of moles in Na₂CO₃ = 5.4 moles

Mole ratio of Na₂CO₃ : CaCO₃ = 1:1

No. of moles in CaCO₃ = 5.4 moles

Mass of CaCO₃ = 5.4 × 100.0869

= 540.46926g

The mini marshmallows would extend to a height of 1.843 x 10 km above the surface of Colorado if they covered the state without any space between them.

To find the height of an Avogadro number of Marshmallows, first, we need to find the total volume of all the mini marshmallows.

Each mini marshmallow has a diameter of 0.635 cm and a height of 2.54 cm, so its volume can be calculated as:

V = πr²h

Volume = π * (0.3175 cm) * (2.54 cm)

Volume = 0.8217 cm³

Avogadro's number is 6.02 x 10²³, so the total volume of all the mini marshmallows can be calculated as:

Total volume = 6.02 x 10²³ * 0.8217 cm³

Total volume = 4.947 x 10³ cm³

Now we can use the land area of Colorado to find the height to which the mini marshmallows would extend if packed together without any space between them.

1.037 x 10⁵ mi² is equal to (1.037 x 10⁵ mi² * 2.59 x 10⁶  = 2.685 x 10¹¹ m²

If the mini marshmallows cover this area without any space between them, their height can be calculated as:

Height = total volume/area

Height = (4.947 * 10²³ cm³) / (2.685 x 10¹¹ cm²)

Height = 1.843 x 10² cm

Converting to kilometers, we get:

Height = (1.843 x 10¹ ²cm) / (100,000 cm/km)

Height = 1.843 x 10⁷ km

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The Avogadro's number is the constant number for the number of atoms or molecules represented in 1 mol, this number is equal to 6.022*10^23, to find out how many molecules there are in 6.0 moles we can set up this equation:

6.0 moles of CH4 * 6.022*10^23 molecules / 1 mol of CH4

The answer will be 3.61*10^24 molecules of CH4

Answer:

overflow the top edge of the filter paper

The metric tons of \(5.3 * 10^3\) lb is 11.74 metric tons

A metric ton is a unit of measurement for mass or weight, and it is equal to 1000 kilograms. It is commonly used to measure the weight of large objects such as ships, steel beams, or large quantities of material. It is also used to measure the capacity of a cargo container, or the weight of a truckload of goods. Metric tons are often abbreviated as "t" or "MT".

One metric ton is equal to 1000 kg, and one pound is equal to 0.45359237 kg.

To convert\(5.3 * 10^3\) lb to metric tons, we can use the following equation:

\(Metric tons =\frac{ (5.3 *10^3 lb) }{ (1000 kg/metric ton)} \\ = \frac{(5.3 * 10^3 lb) }{ (0.45359237 kg/lb)} \\ \\= 11.74 metric tons\)

Therefore, The metric tons of \(5.3 * 10^3\) lb is 11.74 metric tons

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Answer:

get a little more than that is a great deal for the company and inventor of a company how can we get u a great job with their best friend in a few months but il will send you i will be the only person I know of fishes and the best I have to ask me to make it to my own home wifi and I am grade up to the same thing and the same way of the American people I have a lot to make a simple one person

Answer:

P₂ = 0.13880 atm

Explanation:

Given info are;

Initial volume = 13.0 L

Initial pressure = 3.15 atm

Initial temperature = 213.0 K

Final temperature = 398.0 K

Final volume = 35.0 L

Final pressure = ?

Note;

Base on general gas equation:

P₁V₁/T₁ = P₂V₂/T₂

Formula = P₁V₁/T₁ = P₂V₂/T₂  

Solution:

P₂ = P₁V₁ T₂/ T₁ V₂

P₂ = 3.15 atm x 13.0 L x 398.0k/213.0 k x 35.0 L  

P₂ = 1034.8 atm .L.K/ 7455 K.L

P₂ = 0.13880617035

P₂ = 0.13880 atm  

When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.

Thus we will include five significant figures in answer because 1034.8 have five significant figure.

[RevyBreeze]

Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new pressure of gas is 0.13880 atm .

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 L.atm/K.mol

Combining Boyle's and Charles' gas law

P₁V₁/T₁ = P₂V₂/T₂

P₂ = P₁V₁ T₂/ T₁ V₂

P₂ = 3.15 atm x 13.0 L x 398.0k/213.0 k x 35.0 L  

P₂ = 1034.8 atm .L.K/ 7455 K.L

P₂ = 0.13880617035

P₂ = 0.13880 atm  

Therefore the new pressure of  gas is 0.13880 atm  when the temperature is changed to 398.0 K  and volume is increased to 35.0 liters.

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Answer:it’s b they transfer thermal energy away from earths core towards its crust

Explanation:

Good luck!

Thermal energy moves from the outer core, through the mantle, and to the  crust by conduction.

Heat transferred from the core through the mantle and to the crust in the process of conduction. The lower mantle is heated directly by conduction from the core. In conduction, heat is transferred from one particles to another.

In the process of conduction, heat flows from warmer objects to cooler objects so the outer core has high amount of heat energy which is transferred to the surrounding mantle layer due to its lower temperature so we can conclude that thermal energy moves from the outer core, through the mantle and to the crust by conduction.

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Answer:

D

Explanation:

elections are negatively charged

Alkaline earth metals will react in a 1:1 ratio with group 16 nonmetals to generate a compound.

Our two ratios would combine. As a result of their greater positive charge and smaller iniquity. Compared to alkali metals, alkaline earth metals have a significantly stronger tendency to form a complex with the Lewis base.

Alkali metals, which contain a single valence electron, and the halogens react aggressively. The two components come together to create salt. For instance, the reaction between the alkali metal sodium (Na) and the halogen chlorine (Cl) yields table salt, or sodium chloride (NaCl).

The group 1 element Li, Na, K, Rb, Cs, and Fr are alkali metals. When sliced, the alkali metals are all supple, metallic, and lustrous.

As an illustration, each member of Group 1 surrenders one electron to become a 1+ cation. A 1- anion can be created by adding one electron to any element in Group 17. Ionic compounds can be created when elements from Groups 1 and 17 mix one to one.

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Answer:

C2H4O2

Explanation:

In this molecule two carbon molecule , four hydrogen molecules and two oxygen molecules are present . So C₂H₄O₂ is the correct molecular formula of this structure. Option B is correct.

The molecular formula defines the number of atoms of each element in one molecule of a compound. It shows the actual number of each atom in a molecule.

An empirical formula represents the simplest whole-number ratio of various atoms present in a compound. The molecular formula shows the exact number of different types of atoms present in a molecule of a compound.

In this structure there are 2 carbon molecules, 4 hydrogen molecules and 2 oxygen molecules are present.

Hence , the option B is correct . The molecular formula of this structure is C₂H₄O₂.

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Answer:cutting paper

Explanation:

The reaction for Carbon-14, used in carbon dating, decays by beta emission and in Uranium-238 decays by alpha emission.

Alpha radiation releases when the nucleus of an atom becomes unstable and alpha particles are released in order to restore stability. Alpha decay occurs in elements have high atomic numbers, such asuranium, radium, and thorium etc. The reaction that describes an alpha emission because radiations are 5740 years. Now, Carbon-14 has a half life of 5730 yrs, and it used to date fossils of 50 hundred yrs old. It undergo beta emission. In case of Uranium- 238, has half life of 236 yrs. Because there is so much difference between half lives of both so we can't use both of together in one reaction. So, it goes on alph emission. The reactions are

¹⁴₆C → ¹⁴₇N - e⁻

Hence, required reaction is alpha emmision.

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Effects of carbon monoxide partial pressures on the synthesis of medium chain fatty acids and methanogenesis during the fermentation of ethanol is to sustained electron and carbon donor for fatty acid elongation.

What is methanogenesis?

Methane is the end product of metabolism and is produced by methanogenesis, an anaerobic respiration. Organic matter, such as glucose, is oxidized to CO2 in aerobic respiration, and O2 is reduced to H2O. H2 is oxidized to H+ while CO2 is converted to CH4 during hydrogenotrophic methanogenesis, in contrast.

The major goal of this research was to ascertain whether increasing the formation of acetate or MCFA during the fermentation of ethanol would result from inhibiting methanogenesis by adding CO continuously.

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Answer:

Is D

Explanation:

hope this is helpful

Answer:

(i) To calculate the number of moles of sodium thiosulphate present in the solution, we can use the formula:

moles = concentration x volume

The concentration of the sodium thiosulphate solution is given as 0.100 mol dm^-3 and the volume is 36.0 cm^3.

We can calculate the number of moles of sodium thiosulphate as:

moles = 0.100 mol dm^-3 x (36.0 cm^3 / 1000 cm^3/dm^3) = 0.0036 mol

(ii) We are told that six moles of sodium thiosulphate were needed for each mole of sodium iodate(V). So, we can calculate the number of moles of sodium iodate(V) in the sample as:

moles of sodium iodate(V) = moles of sodium thiosulphate / 6

moles of sodium iodate(V) = 0.0036 mol / 6 = 6.00 x 10^-4 mol

(iii) To calculate the concentration of the sodium iodate(V) solution in mol dm^-3, we can use the formula:

concentration = moles of solute / volume of solution

The number of moles of sodium iodate(V) is 6.00 x 10^-4 mol and the volume of the solution is 50.0 cm^3.

so,

concentration = 6.00 x 10^-4 mol / (50.0 cm^3 / 1000 cm^3/dm^3) = 1.2 x 10^-4 mol dm^-3

(iv) To calculate the concentration of the sodium iodate(V) solution in g dm^-3, we can use the formula:

concentration in g dm^-3 = molar mass x concentration in mol dm^-3

The molar mass of sodium iodate(V) is 198 g/mol.

so,

concentration in g dm^-3 = 198 g/mol x 1.2 x 10^-4 mol dm^-3 = 0.00237 g dm^-3

This is the final concentration of sodium iodate(V) solution in g dm^-3.

Answer:

True

Explanation:

Answer:

True

Explanation:

Most people stick to what they know and don't look for a laughing place.

Answer:

D. cerium

Explanation:

Lanthanide, also called lanthanoid, any of the series of 15 consecutive chemical elements in the periodic table from lanthanum to lutetium (atomic numbers 57–71).

The probability of occupying the second energy level in an energy diagram of two energy levels, one at 0 cm-1 and one at 300 cm-1, will be 0.15 when the temperature is 874 K (600°C)

We can write the formula as, Substituting the values: E2 - E1 = 300 cm-1 (which equals to 3 × 104 m-1 or 3.96 × 10-19 J).Then the probability of occupying the second level be 0.15 when the temperature is 874 K (600°C).

If two particles are in the second energy level, then the temperature will be higher than in case a. This is because having two particles in the second energy level (instead of none) indicates that there is an external source of energy that has raised the temperature of the system, since at lower temperatures, particles will occupy the lowest possible energy level.

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The potential of the cell helps to evaluate the voltage difference between two half-cells.

Changing the concentration of one solution in the cell will increase the voltage potential of the cell because putting the system further out of equilibrium.

A chemical reaction is affected by three main variables mainly temperature, surface area, and concentration. In an electrochemical cell, the higher concentration allows the increase in voltage difference.

The higher concentration of reactant moves the reaction in the forward direction to react at a higher pace, and as a result, higher voltage is observed.

A concentration cell acts to dilute the more concentrated solution and concentrate the more dilute solution, creating a voltage as the cell reaches an equilibrium.

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2.56 moles of HCl are required to react with 0.64 moles of KMnO4.

The balanced chemical equation is given as;2KMnO4 + 8HCl → 3Cl2 + 2MnO2 + 4H2O + 2KCl.This equation is balanced in such a way that 2 moles of KMnO4 reacts with 8 moles of HCl to produce 3 moles of Cl2, 2 moles of MnO2, 4 moles of H2O and 2 moles of KCl.We are given the number of moles of KMnO4 as 0.64 moles.Now, we can use stoichiometry to find the number of moles of HCl required to react with 0.64 moles of KMnO4.The balanced chemical equation shows that 8 moles of HCl reacts with 2 moles of KMnO4.

So, one mole of KMnO4 would react with 8/2 = 4 moles of HCl.Now, the number of moles of HCl required to react with 0.64 moles of KMnO4 would be;Moles of HCl = Moles of KMnO4 x (Moles of HCl / Moles of KMnO4) Moles of HCl = 0.64 x 4 = 2.56 moles of HCl.

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Answer:

The rate of the forward reaction equals the rate of the reverse reaction. I think it is right

Explanation:

I hope I help you today

Answer:

Explanation:hii

Answer:

Br

Explanation:

Because Fl is a halogen and also Br is the only halogen element in the choices

The element that would most likely have similar properties with that of Fluorine (F) is Bromine (Br).

The periodic table shows the tabular arrangement and representation of chemical elements. On the periodic table, elements are arranged in groups(vertical columns) and periods(horizontal rows).

Elements in the same groups are said to exhibit similar chemical properties.

From the periodic table, Fluorine (F) and Bromine(Br) are members of the halogen families and they exhibit the same chemical properties.

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The correct balanced equation for the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite is: B) H2SO3(aq) + 2 LiOH(aq) → 2 H2O(l) + Li2SO3(aq).

Lithium hydroxide is an inorganic compound with the formula LiOH. It can exist as anhydrous or hydrated, and both forms are white hygroscopic solids. They are soluble in water and slightly soluble in ethanol. Both are available commercially. While classified as a strong base, lithium hydroxide is the weakest known alkali metal hydroxide.

Sulfurous acid (H2SO3) reacts with lithium hydroxide (LiOH) in a 1:2 ratio to produce water (H2O) and lithium sulfite (Li2SO3). The balanced equation ensures that the number of atoms for each element is the same on both sides of the equation.

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An epoxide is a heterocyclic organic compound with an oxygen ring. The acid protonates the oxygen, which opens the ring and starts the process.

What exactly is carbocation?

A carbocation is a molecule with three bonds and a positively charged carbon atom. To put it simply, they are essentially carbon cations. It was previously known as carbonium ion. A carbocation is any even-electron cation having a significant positive charge on the carbon atom.

Because of an incomplete octet, carbon cations are particularly reactive and unstable in general.

To put it simply, carbocations do not meet the octet rule because they lack eight electrons.

According to the question, carbon hybridization in carbocation will be sp2 with a trigonal planar structure. There is also an empty p orbital, suggesting that it is electron-deficient. Carbon contains six electrons in its valence shell. As a result, it is an electron-deficient species, also known as an electrophile.

An epoxide is a heterocyclic organic compound with an oxygen ring. The acid protonates the oxygen, which opens the ring and starts the process. A carbocation is now generated, which is quickly attacked by a water molecule.

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An epoxide is a heterocyclic organic compound with an oxygen ring. The acid protonates the oxygen, which opens the ring and starts the process.

What exactly is carbocation?

A carbocation is a molecule with three bonds and a positively charged carbon atom. To put it simply, they are essentially carbon cations. It was previously known as carbonium ion. A carbocation is any even-electron cation having a significant positive charge on the carbon atom.

An epoxide is a heterocyclic organic compound with an oxygen ring? The acid protonates the oxygen, which opens the ring and starts the process. A carbocation is now generated, which is quickly attacked by a water molecule.

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