Which stament describes the atoms of an element?

Answer:

B

Explanation:

Total, 65,071 kJ of heat is released when 13.6 kg of Ethene reacts to form C₂H₆.

To calculate the amount of heat released when 13.6 kg of C₂H₄ reacts to form C₂H₆, we need to use the given energy change per mole of C₂H₄ and convert the mass of C₂H₄ to moles.

The molar mass of C₂H₄ (ethylene) is approximately 28 g/mol.

First, let's we convert the mass of C2H4 to moles;

Mass of C₂H₄ = 13.6 kg = 13,600 g

Moles of C₂H₄ = Mass of C₂H₄/Molar mass of C₂H₄

Moles of C₂H₄ = 13,600 g / 28 g/mol

≈ 485.71 mol

Next, we can calculate the amount of heat released using the energy change per mole of C₂H₄;

Heat released = Energy change per mole of C₂H₄ × Moles of C₂H₄

Heat released = -134 kJ/mol × 485.71 mol

Heat released ≈ -65,071.34 kJ

Now, we take the absolute value;

Heat released ≈ 65,071 kJ

Therefore, approximately 65,071 kJ of heat is released when 13.6 kg of C₂H₄ reacts to form C₂H₆.

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Answer:

They creat a chemical compound

Explanation:

The 2 chemicals will converge and create a chemical compound (or a different element) .

Answer:

On average, a driver's side airbag can inflate to a volume of around 60 to 80 liters (16 to 21 gallons), while a passenger's side airbag can inflate to a volume of around 100 to 120 liters (26 to 32 gallons).

Explanation:

The reaction in an airbag involves several elements and compounds, including:

1. Sodium azide (NaN3): This is a primary component of the propellant used in most airbag systems. When heated, sodium azide decomposes into nitrogen gas (N2) and sodium metal.

2. Potassium nitrate (KNO3): This is another component of the propellant that provides additional oxygen to support the combustion of sodium azide.

3. Silica (SiO2): This is a common material used in the manufacture of airbag fabrics. When the airbag inflates, the silica particles in the fabric help to prevent the bag from tearing or puncturing.

4. Nitrogen gas (N2): This is the primary gas produced during the airbag reaction. The nitrogen gas is used to inflate the airbag quickly and provide a cushion between the vehicle occupant and hard surfaces.

5. Carbon dioxide (CO2): This is a secondary gas produced during the airbag reaction. The CO2 is produced as a result of the combustion of sodium azide and the reaction between sodium metal and water vapor present in the air.

A compound with one alkyl group attached to a phosphate group is known as a phosphate ester.

Phosphate esters are organic compounds that contain a phosphate group bonded to an alkyl or aryl group through an oxygen atom. These compounds are commonly found in biological systems and have important roles in cell signaling, energy metabolism, and DNA synthesis. Examples of phosphate esters include adenosine triphosphate (ATP), a molecule that stores and transfers energy in cells, and phosphatidylcholine, a major component of cell membranes.

Due to their diverse range of biological and industrial applications, phosphate esters are an important class of compounds in chemistry and biochemistry.

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Answer:

The density of the metal alloy is 7,496.25 kg/m^3 (rounded to 7,496 kg/m^3).

Explanation:

The given information from the exercise is:

- Metal alloy mass (m): 100kg

- Mass of metal A (mA): 60kg

- Mass of metal B (mB): 40kg

- Density of metal A (dA): 9,000 kg/m^3

- Density of metal B (dB): 6,000 Kg/m^3

1st) With the values of mass and density of each metal, we have to calculate the volume of each metal:

• Volume metal A:

• Volume metal B:

The volume of metal A and metal B is 6.67x10^-3 m^3. So, we have to add them to obtain the total volume of the metal alloy:

2nd) Now we can calculate the metal alloy density, replacing the values of Volume (V) and the metal alloy mass (100kg) in the density formula:

So, the density of the metal alloy is 7,496.25 kg/m^3 (rounded to 7,496 kg/m^3).

Answer:

D

Explanation:

Bases have a bitter taste, slippery when touched and they can form hydronium ions. (they can conduct electricity.)

The Avian FLU is a health hazard because it may infect humans (question 1), precautions are being placed to contain the spread of this infection is avoid the spread of infected animals (question 2), and public and scientists prevent highly pathogenic strains of avian influenza from spreading to New York State through correct advertise to authorities in suspicious cases.

The avian flu is a viral disease transmitted by bird species which are the main vectors to be controlled to avoid infection in human populations.

Therefore, with this data, we can see that the avian flu is a viral disease transmitted by bird species and represents a serious problem for healthcare.

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In order for electrolysis to take place, a salt such as Na2SO4 is required. It makes available the ions Na+ and SO42, both of which are drawn to the electrodes in the solution and move toward them as a result. They do not experience a discharge when brought close to the electrodes. However, they are able to cancel out the electric charges carried by the ions that are formed as a result of the destruction of water by these electrodes. Let's check out what's happening at each of the electrodes.

At the cathode, often known as the negative pole, water breaks down in the following manner:

2H2O+2e−⟶H2+2OH−.This is only conceivable if some positive ions are available near the cathode to compensate for the negative charges emerging in the solution with these freshly produced OH ions. The only way this can happen is if there are some positive ions available near the cathode. In the absence of positive ions, such as Na+, in the vicinity of the cathode, the newly formed OH ions would function as a barrier to subsequent electrons coming from the external circuit, preventing those electrons from reaching the electrode and preventing the electrode from interacting with water. The electrolysis would come to a halt as a result.

At the anode, often known as the positive pole, the following reactions take place in water:

4H2O⟶O2+4H++4e− .This is only conceivable if there are negative ions coming near the anode to compensate for the positive charges that are forming in the solution as a result of these freshly produced H+ ions. A positively charged solution would result if the solution near the anode did not include any negative ions, such as SO42. Instead, the solution would contain the new H+ ions. This would stop any further electrons from being released from the water as a result. The electrolysis would come to a halt as a result.

The process culminates in a transformation of the solution's chemical makeup near the electrodes. When you go closer to the cathode, you'll notice that the solution has a higher concentration of NaOH. In the vicinity of the anode, the solution includes an increasing amount of H2SO4. Naturally, if you agitate and combine solutions that are anodic and cathodic, the acid and the base will neutralize each other, which will result in the solution being regenerated to contain the initial salt.

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Answer:DNA

Explanation:Dna

The oxidation of a) 1-hexanol b) 2-hexano c) hexanal with CrO3 in aqueous acid gives 1-hexanoic acid, 2-hexanone and 1-hexanoic acid respectively. The oxidation with PCC gives 1-hexanaldehyde, 2-hexanone and no reaction respectively.

What is PCC?

PCC is also called as pyridinium chlorochromate which is a yellow-orange salt. this is primarily used for the oxidation of alcohols which gives carbonyl compounds as products. It is one of the highly effective oxidizing agents for alcohols.

The oxidation of alcohols with CrO3 gives carbonyl compounds like aldehydes and ketones. With primary alcohol and aldehydes it gives carboxylic acid, whereas with secondary alcohol it gives ketones as products. PCC with primary alcohols give aldehyde, with secondary alcohols give ketone and with aldehyde there is no reaction.

Therefore, CrO3 with 1-hexanol and hexanal gives 1-hexanoic acid, with 2-hexanol gives 2-hexanone. PCC with 1-hexanol gives 1-hexanaldehyde, 2-hexanol gives 2-hexanone and with hexanal there is no reaction.

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Answer:gas, solid

Explanation:ck12

In a solution of hydrogen in palladium, gas is used as a solute and solid is used as a solvent.

This is defined as a homogenous mixture which comprises of two or more substances.  Solute usually dissolves in the solvent to form it.

The hydrogen acts as the solute while the palladium acts as the solvent in this case.

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An unsaturated hydrocarbon is a hydrocarbon that contains one or more carbon-carbon double bonds or triple bonds.

An unsaturated hydrocarbon is a hydrocarbon that contains one or more carbon-carbon double bonds or triple bonds. These double or triple bonds mean that the hydrocarbon has fewer hydrogen atoms per carbon than a saturated hydrocarbon. For example, ethane (C2H6) is a saturated hydrocarbon, while ethene (C2H4) is an unsaturated hydrocarbon. The double bond between the two carbon atoms in ethene means that there is only one hydrogen atom bonded to each carbon, rather than the two hydrogen atoms per carbon found in ethane.
Oxides of nitrogen are a group of gases that includes nitrogen oxide (NO), nitrogen dioxide (NO2), and nitrous oxide (N2O). They are produced naturally by lightning and microbial processes, but they are also produced by human activities, particularly the burning of fossil fuels. Oxides of nitrogen can have harmful effects on human health and the environment. They can react with other chemicals in the atmosphere to form smog, which can lead to respiratory problems, particularly for people with asthma or other lung conditions. They can also contribute to acid rain and the formation of ground-level ozone. In addition, nitrogen oxides are greenhouse gases, contributing to climate change. The physical properties of oxides of nitrogen vary depending on the specific gas, but they are generally colorless, odorless gases that are more dense than air.

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Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

Answer:

The correct answer is C 112

Explanation:

I just took the test good luck :)

Answer:

I think it is 112

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question

mass = 112 g

density of mercury = 13.6 g/mL

We have

\(volume = \frac{112}{13.6} \\ = 8.23529411...\)

We have the final answer as

Hope this helps you

A BCC unit cell with a lattice constant, a, of 2.4 Å. The volume atomic concentration of the unit cell is 0.0722 atoms/ų.

To determine the volume atomic concentration of a Body-Centered Cubic (BCC) unit cell, we need to consider the number of atoms present in the unit cell and the volume occupied by the unit cell.

In a BCC unit cell, there is one atom located at the center of the cube and eight atoms at the corners, but each corner atom is shared among eight adjacent unit cells. Therefore, the total number of atoms present in the unit cell is 1.

The volume of a BCC unit cell can be calculated using the formula:

Volume = a³

where "a" is the lattice constant.

Given that the lattice constant, a, is 2.4 Å, we can calculate the volume of the unit cell as follows:

Volume = (2.4 Å)³

Converting the units to cubic angstroms:

Volume = 13.824 ų

Now, to determine the volume atomic concentration, we need to divide the number of atoms (1) by the volume of the unit cell:

Volume Atomic Concentration = Number of Atoms / Volume

Volume Atomic Concentration = 1 / 13.824 ų

The volume atomic concentration of the BCC unit cell is approximately 0.0722 atoms/ų.

Therefore, the volume atomic concentration of the unit cell in a BCC crystal with a lattice constant of 2.4 Šis approximately 0.0722 atoms/ų.

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The complete question is:

A BCC unit cell with a lattice constant, a, of 2.4 Å. Determine the volume atomic concentration of the unit cell.

The K_{p} of the reaction, 2 HClO₄ (g) ⇄ H₂ (g) + Cl₂ (g) + 4 O₂ (g), is option (E) 2.4 * 10¹¹.

To find the  of this reaction, we will first use the equation:

K_{p} = K_{c} * (RT)^{Δn}

where R is the universal gas constant (8.314 J/mol*K), T is the temperature in Kelvin (273 + 155 = 428K), and Δn is the change in the number of moles of gas.

1: Calculate Δn :

Δn = (moles of products) - (moles of reactants)

Δn = (1 + 1 + 4) - (2) = 4

2: Calculate (RT)^{Δn}:

(RT)^{Δn} = [(8.314 J/mol*K) * (428K)]⁴ = 1.60 * 10¹⁴

3: Calculate :

\(K_{p}\) = \(K_{c}\) * \((RT)^{Δn}\)

Kp  = (1.5 * 10⁻³) * (1.60 * 10¹⁴) = 2.4 * 10¹¹

Therefore, the correct option is E.

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Answer:

the area went through major changes in climate over geologic time

Explanation:

Different types of sediment is a good indication of different climates.For example, if an area just experienced the same type of climate, like a desert, we would expect to observe the same types of sediment/rocks in the area

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A GC-MS produces muti data, including chromatograms for quantitative and qualitative analysis, mass spectra for confirming identity, identifying unknown analytes, and determining the structural and chemical properties of molecules.

The GCMS uses a standard, or a proportion of the component that has already been established and has also been measured on the GCMS, to quantify the concentration of each chemical in a sample.

On a chart known as a chromatogram, a peak for each substance that the GC separates is used to symbolize it. The number of peaks reflects the sample's concentration of separated components. Each peak's location reveals the retention time of the compound.

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Titration is the process of determining the amount of a substance in a solution by measuring the volume of a solution with a known concentration that is required to react with it. The answer to the given question is option d) 5.25.

In the titration of a weak base with a strong acid, the pH at the half-equivalence point can be calculated as follows: At the half-equivalence point, we have equal moles of the weak base and the strong acid. As a result, we get a solution that contains the weak base, its conjugate acid, and water. In the solution, there is an equilibrium between the weak base and its conjugate acid. This equilibrium has an acid dissociation constant, Ka. It's given by:

Ka = [H+][A–]/[HA]

The pKa is calculated by taking the negative logarithm of Ka:

pKa = -log(Ka)

At the half-equivalence point, [HA] = [A–] and the expression for pKa becomes:

pKa = -log([H+])

Therefore, the pH at the half-equivalence point is:

pH = 1/2 (pKb + pKa)

Given that pKb = 7.95 for the weak base, we can calculate the pKa:

pKw = 14 (at 25°C)

pKw = pKa + pKb

14 = pKa + 7.95

pKa = 6.05

Therefore, the pH at the half-equivalence point is:

pH = 1/2 (7.95 + 6.05)

pH = 1/2 (14)

pH = 7

At the half-equivalence point, the pH of the solution is equal to 7. Therefore, option d) 5.25 is incorrect.

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3.07 moles of hexane must burn to form 18.4 moles of carbon dioxide.

Moles of any substance is define as the ratio of the given mass to the molar mass of that substance.

Given chemical reaction is:

2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O

From the stoichiometry of the reaction, it is clear that:

2 moles of C₆H₁₄ = produce 12 moles of CO₂

1 moles of CO₂ produced by = 2/12 moles of C₆H₁₄

18.4 moles of CO₂ produced by = 1/6×18.4=3.07 moles of C₆H₁₄

Hence, option (2) is correct i.e. 3.07 moles.

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Higher oxides refer to compounds where an element has a higher oxidation state than its most common state. Here are some examples of higher oxides:

Manganese dioxide (MnO2): Manganese can exist in several oxidation states, but manganese dioxide is a higher oxide, where manganese has an oxidation state of +4.

Lead dioxide (PbO2): Lead usually has an oxidation state of +2 in its compounds, but in lead dioxide, it has an oxidation state of +4.

Chromium trioxide (CrO3): In this compound, chromium has an oxidation state of +6, which is a higher oxidation state than its most common state of +3.

Nitrogen pentoxide (N2O5): Nitrogen usually has an oxidation state of -3 in its compounds, but in nitrogen pentoxide, it has an oxidation state of +5.

Peroxides (such as hydrogen peroxide H2O2 or sodium peroxide Na2O2): These compounds contain an element in an oxidation state of -1, which is higher than its most common oxidation state.

Sulfur trioxide (SO3): In this compound, sulfur has an oxidation state of +6, which is higher than its most common state of +4.

These are just a few examples of higher oxides. There are many more compounds that contain elements in higher oxidation states.

Answer:

Explanation:

Carbon (C) contains the largest number of moles.

Number of Moles of a substance can be defined as the ratio of given mass of the substance to the Molecular Mass of the substance.

We can write,

Number of moles = Given Mass / Molecular Mass                euation1

Given Mass of Na, C, Pb, Cu, Ne each = 10.0g

Molecular mass of Na = 22.9898 u

Molecular mass of C = 12u

Molecular mass of Pb = 207.2u

Molecular mass of Cu = 63.546 u

Molecular mass of Ne = 20.1797 u

After substituting the values of molecular mass and given mass of elements in equation1 , we will get

Number of moles of Na = (10/22.9898) = 0.4350

Number of moles of C = (10/12) = 0.8333

Number of moles of Pb = (10/207.2) = 0.0483

Number of moles of Cu = (10/63.546) = 0.1574

Number of moles of Ne = (10/20.1797) = 0.4955

So, we can clearly see that Carbon contains the largest number of moles.

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If you started with 1.5 moles of H2 at STP, you would have approximately 33.6 liters of volume of hydrogen (H₂) gas.

To determine the number of liters of H2 you have, we need to consider the conditions under which the gas is being held (i.e. temperature and pressure), as well as the molar volume of H2 at those conditions.

At standard temperature and pressure (STP), which is 0°C (273.15 K) and 1 atm (101.325 kPa), the molar volume of any ideal gas is approximately 22.4 L/mol.

Therefore, at STP, 1.5 moles of H₂ would occupy approximately:

V = n x Vm = 1.5 mol x 22.4 L/mol = 33.6 L

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The complete question is below:

HOW MANY LITERS OF H2 DO YOU HAVE IF YOU START WITH 1.5 MOLES OF H2? (assume STP condition)

Answer:

He started factories and mills. He created World's first water- powered mill at Cromford, where he employed more than 200 people. This was just the beginning of the many factories which he would later set up. Because of this, Arkwright was known as the father of the modern industrial factory system........Hope you got it

As a result, the aluminum emits -180 J of heat when it is reduced from 70 to 50 degrees Celsius.

The mobility of atoms and molecules is accelerated when energy is added (heating), increasing the temperature. By withdrawing energy (cooling), atoms and molecules slow down and the temp drops as a result. Conduction is a technique that allows energy to be added to or taken away from a medium.

The following formula is used to calculate how much heat is emitted when aluminum is reduced from 70°C to 50°C:

Q = mcΔθ

where;

m is the aluminum's mass.

Specific heat capacity is c.

Δθ is a temperature change.

Q = (10)(0.9)(50 - 70) (50 - 70)

Q = -180 J

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Answer:

a bacterium with a rigid spiral structure,found in stagnant water and something causing disease

In the given chemical equation, oxidation takes place at anode  of the electrochemical cell .

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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When a sodium atom transfers an electron to a chlorine atom, a chemical reaction occurs resulting in the formation of a sodium ion (Na+) and a chloride ion (Cl-).

This process is known as ionic bonding and is the result of the transfer of electrons from sodium to chlorine.

The reaction does not produce a new chemical compound or molecule, as this would require the combination of the two atoms with something else (e.g. oxygen, hydrogen, etc.).

This means that the reaction is not a chemical reaction, and so does not produce a new chemical compound or molecule.

In summary, when a sodium atom transfers an electron to a chlorine atom, ionic bonding occurs and the result is the formation of a sodium ion and a chloride ion. This process does not produce a new chemical compound or molecule.

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