for the following reaction, if o2 is used up at a rate of 1.45mhr, what is the rate of formation of h2o? 4nh3 5o2→4no 6h2o

Answer:

There are 24*60 minutes in a day (ignoring the imperfections of the natural world, the Earth and Sun). So there are 24*60 valid 24 hour times (excluding seconds) on a digital clock.

A measure of time representing the interval between consecutive passages of the Sun across the meridian, averaged over one year. 1 day = 24 hr (86,400 sec) and 60 minutes.

hope it helps ya mate! :-P

A radioactive substance decreases by 65% each hour. Find the hourly decay factor. The hourly decay factor is 0.35.

Chemicals in the class of radionuclides (also known as radioactive materials) have unstable atomic nuclei. They become stable by undergoing modifications in the nucleus (spontaneous fission, alpha particle emission, neutron conversion to protons, or the opposite).

A radioactive atom will naturally emit radiation in the form of energy or particles in order to transition into a more stable state. The difference between radioactive material and the radiation it emits must be made.

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The decay constant for the radioactive isotope in this problem is approximately 0.069\(h^-^1\).

The activity of a radioactive isotope is the rate at which it decays, and is measured in becquerels (Bq). The activity of a sample of radioactive material decreases over time as the number of radioactive nuclei in the sample decreases due to radioactive decay.

The rate of radioactive decay is described by the first-order rate law, which relates the rate of decay to the number of radioactive nuclei present in the sample. The rate constant (λ) for radioactive decay is a characteristic property of the isotope and is related to its half-life (t1/2) by the equation:

t1/2 = ln(2)/λ

where ln(2) is the natural logarithm of 2, which is approximately 0.693.

To find the decay constant for the radioactive isotope in the given problem, we can use the following equation:

A = A0 e^(-λt)

where A is the activity at time t, A0 is the initial activity, and t is the time elapsed since the initial measurement.

Substituting the given values into this equation, we get:

80.2 Bq = 114 Bq e^(-λ(3 h 50 min))

Converting the time elapsed to hours, we get:

t = 3.833 h

Substituting this value, we get:

80.2 Bq = 114 Bq e^(-λ(3.833 h))

Dividing both sides by 114 Bq, we get:

0.704 = e^(-λ(3.833 h))

Taking the natural logarithm of both sides, we get:

ln(0.704) = -λ(3.833 h)

Solving for λ, we get:

λ = -ln(0.704)/3.833 h

λ ≈ 0.069 h^-1

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The correct answer is (d) They are broken down when exposed to heat and oxygen.

The minerals are inorganic substances which are obtained from earth's crust. It is a naturally occurring inorganic element or compound having an orderly internal structure and characteristic chemical composition, crystal form, and physical properties.

Common minerals include quartz, feldspar, mica, amphibole, olivine, and calcite. They are used by plants and animals to perform various physiological functions. Plants obtain minerals from the soil. Animals get minerals from plants or other animals.

Therefore, options (a), (b), and (c) are correct because minerals are not produced by plants and animals. Minerals are in their simplest chemical form, and minerals are obtained from the earth's crust and environment. They are not broken down when exposed to heat and oxygen. So, option (d) is incorrect. Hence, the correct option is (d) They are broken down when exposed to heat and oxygen.

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You would be most likely to use a slicing machine if you were using the icebox method to produce cookies.

In the icebox method a type of cookie in which the dough is made, rolled into a stick, and refrigerated until the dough hardens. The dough can be removed from the refrigerator, cut into individual pieces, and then baked. The rest of the dough is returned to the refrigerator until needed.

Icebox method, also known as refrigerator cookies, are sliced ​​and baked cookies. The dough is formed into logs, chilled in the refrigerator (also called an icebox), sliced ​​, and then baked.

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Orange waves have a lower frequency and contain less energy than green waves.

What is Wave?

A wave is a disturbance or oscillation that travels through space and time, accompanied by the transfer of energy without the transfer of matter. Waves can take many different forms, including sound waves, light waves, water waves, and seismic waves. They can be described in terms of their frequency, wavelength, amplitude, and velocity, among other properties. Waves play a fundamental role in many areas of science and technology, including communication, medicine, and engineering.

The energy of a wave is directly proportional to its frequency, which means that higher frequency waves contain more energy than lower frequency waves. The frequency of a wave refers to the number of complete cycles or oscillations that the wave undergoes per second, and is measured in units of Hertz (Hz).

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Answer:

a phosphatidylcholine

The molecule that  contains sphingosine is a  phosphatidylcholine compound.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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Answer:

3fe s )+ 4h2o G )= fe3o4 s )+ 4h2 G

Explanation: 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) (i) Iron metal is getting oxidised. (ii) Water is getting reduced. (iii) Water is acting as reducing agent.

Explanation:

i make a search

When 12.00 moles of Fe react with 6.00 moles of O2, the number of moles of Fe₃O₄ that can be produced is 4.00 moles.

To determine the number of moles of Fe3O₄ produced, we need to consider the balanced chemical equation for the reaction between Fe and O₂, which is:

4Fe + 3O₂ -> 2Fe3O₄

From the balanced equation, we can see that the mole ratio between Fe and Fe₃O₄ is 4:2 or 2:1. This means that for every 4 moles of Fe consumed, 2 moles of Fe3O₄ are produced.

Given that we have 12.00 moles of Fe, we can calculate the moles of Fe3O₄ produced as follows:

moles of Fe₃O₄ = (12.00 moles of Fe) * (2 moles of Fe3O₄ / 4 moles of Fe)

Simplifying the expression, we find:

moles of Fe3O₄ = 6.00 moles of Fe₃O₄ / 4

Therefore, the number of moles of Fe3O₄ that can be produced is 4.00 moles.

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Here's link to the answer:

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C: carbon is getting oxidised in the reaction. Oxidation and reduction both takes place in a redox reaction.

In k2Cr2O7 , the K is in + 1 oxidation state , Cr is in + 6 oxidation state, and O is in -2 oxidation state

On the right hand side Cr is in +3 oxidation state that means Cr is getting reduced in the reaction.

In C3H8O2 , H and O are ih their general oxidation states +1 and -2 respectively. Here alcoholic group is getting oxidised to carboxylic group. So C is getting oxidised.

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Answer:

C3h8o2

Explanation: oxidation and reduction simultaneously occurs in a redox reaction. Atoms in a molecule during oxidation and reduction changes the oxidation state, in case of oxidation, it increases while in the case of reduction it decreases.

In the given reaction K,Cr, and O have oxidation number +1,+6 and -2 in K2Cr2O7. But on the right side, the oxidation state of Cr changes to +3 and gets reduced in the reaction. Similarly, C3H8O2 undergoes oxidation to C3H8O4,where the alcoholic group get oxidized to carboxylic acid.

The energy of a photon, E, is related to its wavelength, λ, by the equation:  the wavelength of the light is approximately 293 nm.

Wavelength is the distance between two consecutive points on a wave that are in phase, or have the same phase, and can be measured as the distance from one peak of the wave to the next. Wavelength is commonly denoted by the Greek letter lambda (λ) and is usually measured in meters (m), but can also be measured in other units such as nanometers (nm), micrometers (µm), or angstroms (Å).

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The carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron-carbon alloy is 63.4 hours.

To determine the carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron-carbon alloy, we can use Fick's second law of diffusion:

\(DC_{surface} / 2 = (C_{surface} - C_{4mm}) / erf(x / (2 * \sqrt{Dt} ))\\\)

where D is the diffusion coefficient, \(C{surface}\\\) is the surface carbon concentration (0.90 wt%), C_4mm is the carbon concentration at the position 4 mm into the alloy (0.10 wt%), x is the distance from the surface (4 mm), and t is the carburizing time we want to find.

We can use the diffusion coefficient for γ-Fe at 1100°C from Table 5.2, which is D = \(6.0 * 10^{-12} m^2/s.\)

Substituting the given values, we get:

\((6.0 * 10^{-12} m^2/s) * (0.90 - 0.30) / 2 = (0.90 - 0.10) / erf(4 mm / (2 * \sqrt{6.0 * 10^{-12} m^2/s} ))\)

Simplifying the left-hand side, we get:

\(1.8 * 10^{-12} m^2/s = (0.80) / erf(4 mm / (2 * \sqrt{(6.0 * 10^{-12} m^2/s) * t)})))\)

Taking the inverse error function of both sides, we get:

\(erf(4 mm / (2 * \sqrt{6.0 * 10^{-12} m^2/s) * t)} ) = 0.000346\)

Substituting this back into the previous equation, we get:

\(1.8 * 10^{-12} m^2/s = (0.80) / 0.000346\)

Solving for t, we get:

t = 63.4 hours

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Answer:

Neon is a gas and silicon is a solid i solved this for my chemistry teacher dr Thomas project this week

Explanation:

gasses are naturally less stable then non metalloids

In order to prepare 0.13 m nano3 for a lab experiment in a 250-ml volumetric flask, a student needs to weigh out 2.76gof nano3 to dissolve in the flask.

A form of laboratory glassware used to produce solutions is a volumetric flask. A volumetric flask is a bulb with a flat bottom and an extended neck that is calibrated to retain a specific volume at a mark on the neck. The flask can also be referred to as a graduated flask. The volume of the NaNO3 solution is 250 mL, and its molarity is 0.13 M. 250 mL of 0.15 M NaNO3 is calculated as (250/1000)L * (0.13 mol/L) = 0.0325 mol. Weight of 0.0375 mol is required since the molar mass of NaNO3 is 85 g/mol. 2.76g of NaNO3 are equal to 0.0325 mol*(85 g/mol). It is necessary to weigh 2.76 g of NaNO3.

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Minerals do not include crude oil or natural gas. The most obvious difference between gas and oil is that they lack crystal structures and are not solids. Originally derived from rotting plants and animals, they are organic as well.

Any solid material that is a crystal has its constituent atoms arranged in a specific pattern, and its surface regularity mirrors its internal symmetry.

When it comes to gemstones, only rare, precious, or quasi minerals, like diamond, and even some organic bases, like amber, are used, as opposed to crystals, which can be any element arranged in a geometric form. Although some crystals could be made to sparkle similarly, they are typically cut or polished in a manner that causes the gem shimmer and glisten.

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The answer is C.

The reactants are charcoal that is unlit + oxygen and the products are the burnt charcoal + energy.

So for every combustion reaction like this one, CxHy is the wood. So before you light the wood, it is actally a reactant together with oxygen, because without oxygen the wood will not burn. So under the influence of heat, wood produces substances like carbon dioxide and heat, the moment you see wood burning it it already producing products, CO2 and heat (which is the fire). This is a combustion reaction.

Combustion reaction is exothermic because it releases energy.

Answer:

The Ice is Less Dense than the Water

Explanation:

I just answered this one myself, and the explanation is also just that Ice isn't dense enough to sink.

Answer:

c) how sedimentary rock forms

The reaction is an oxidation-reduction reaction because here Sodium is oxidized from Na to Na⁺ while hydrogen is reduced from H⁺ to H₂⁰.

The reaction below: 3Na(s) + 3H₂O(l)= 3NaOH(aq) + H₂(g)

1. The reaction is an oxidation-reduction reaction because here Sodium is oxidized from Na to Na⁺ while hydrogen is reduced from H⁺ to H₂⁰.

2.  The substances oxidized are Na and reduced. is H⁺.

3. The reducing agent is Na and the oxidizing agent is H₂O.

4.  half ionic equation for the oxidation

  Na => Na⁺ + e⁻

The half ionic equation for the reduction equation.

H₂O + e⁻ => H₂

An oxidation-reduction reaction is any chemical response in which the oxidation number of a molecule, atom, or ion changes by way of gaining or losing an electron. Redox reactions are common and crucial to some of the basic features of lifestyles, such as photosynthesis, respiration, combustion, and corrosion or rusting.

Oxidation is a chemical procedure. it is defined as a method that occurs whilst atoms or agencies of atoms lose electrons. some other manner to define oxidation is when a chemical species gains oxygen or loses hydrogen. whilst these activities occur, oxidation takes area.

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To determine the specific volume of a sample of dry air, we can use the ideal gas law. The ideal gas law equation is:

PV = nRT

Where:

P = Pressure (in Pascal)

V = Volume (in cubic meters)

n = Number of moles of the gas

R = Ideal gas constant (8.314 J/(mol·K))

T = Temperature (in Kelvin)

To convert the given pressure and temperature to the SI units (Pascal and Kelvin), we have:

Pressure = 50 kPa = 50,000 Pa

Temperature = 263 K

Now, we can rearrange the ideal gas law equation to solve for volume (V):

V = (nRT) / P

Since we're dealing with a specific volume, we need to determine the volume per unit mass. Therefore, we'll consider one kilogram (kg) of dry air.

To calculate the number of moles (n) of air in one kilogram, we need to know the molar mass of dry air. The molar mass of dry air can be approximated as 28.97 g/mol.

1 kg of air = 1000 g

Number of moles (n) = (mass of air) / (molar mass of air)

n = (1000 g) / (28.97 g/mol)

Now we can substitute the values into the equation:

V = [(1000 g) / (28.97 g/mol)] * (8.314 J/(mol·K)) * (263 K) / (50,000 Pa)

V/n ≈ 0.0434 m³/mol is the specific volume of the dry air sample.

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First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges .  it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.

Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

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The octet rule is a guideline in chemistry that states that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration with eight valence electrons.

1) This configuration is similar to the noble gases, which have full outer electron shells.

2) To construct a Lewis structure for a molecule, the following steps should be followed:
  a) Determine the total number of valence electrons for all atoms in the molecule.
  b) Identify the central atom, usually the least electronegative atom, and place it in the center.
  c) Connect the central atom to the surrounding atoms using single bonds.
  d) Distribute the remaining electrons around the atoms to satisfy the octet rule, starting with the outer atoms.
  e) If the central atom doesn't have an octet, form multiple bonds by converting lone pairs on outer atoms into bonding pairs.
  f) Check if all atoms have an octet, except for hydrogen, which only needs 2 electrons.

3) The element H (hydrogen) has 1 valence electron, and the element N (nitrogen) has 5 valence electrons.

4) To calculate the number of non-bonding electrons in a Lewis structure, subtract the number of electrons used in bonding (calculated by the total number of valence electrons used for bonding) from the total number of valence electrons for the atom or molecule. These remaining electrons are the non-bonding electrons.

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Ethyl 4-aminobenzoate is likely to dissolve in 3 M HCl as it is a base and can react with the acid to form a salt, which is soluble in water.

The three aromatic compounds are ethyl 4-aminobenzoate, 2-nitrotoluene, and 1,3,5-trimethylbenzene. When these solids are placed in 3 M HCl, only the compound with basic properties (ethyl 4-aminobenzoate) is likely to dissolve. This is because HCl is a strong acid that dissociates completely in water to produce H+ ions.

When HCl is added to a basic compound like ethyl 4-aminobenzoate, the H+ ions react with the lone pair of electrons on the nitrogen atom of the amine group, neutralizing the basicity of the compound and producing a water-soluble salt. On the other hand, the other two compounds, which are not basic, will not react with HCl and will not dissolve in the acidic solution. Therefore, ethyl 4-aminobenzoate is the most likely compound to dissolve in 3 M HCl.

The complete question is
If a solid mixture of the three aromatic compounds shown below is placed in 3 m hcl, which is likely to dissolve?

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Answer:

Yes, it is

Explanation:

Silicon (IV) oxide, commonly known as silica is a substance that majorly constitutes SAND. It has the chemical formula, SiO2, which contains a combination of silicon and oxygen.

The IUPAC name of SiO2 is Silicon IV oxide, which can also be referred to as Silicon dioxide because the structure the compound contains two (-di) oxygen atoms. Hence, based on the question, silicon(IV) oxide is the same as silicon dioxide.

The limiting reactant is oxygen gas (O2) because it will run out first and limit the amount of product that can be formed.

To determine the limiting reactant in this reaction, we'll first look at the balanced chemical equation:

2H₂(g) + O₂(g) → 2H₂O(l)

Now, we'll compare the available moles of each reactant to their stoichiometric ratios in the equation. We have 5.00 moles of H₂ and 1.20 moles of O₂.

For H₂, divide the available moles by its stoichiometric coefficient (2): 5.00 mol / 2 = 2.50 mol
For O₂, divide the available moles by its stoichiometric coefficient (1): 1.20 mol / 1 = 1.20 mol

Since 1.20 mol of O₂ is less than 2.50 mol of H₂, O₂ is the limiting reactant in this reaction.

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Answer:

1: They could get mixed up and then it messes other stuff up, 2: It keeps you orgnized

Explanation:

Answer:

B.18 protons 22 neutrons 18 electrons

Explanation:

Neutral atom of Argon;

     Atomic mass  = 40amu

     Atomic number   = 18

Let us find the number of the subatomic particles;

 Protons are the positively charged particles in an atom

 Electrons are the negatively charged particles

 Neutrons do not carry any charges.

Now;

  Atomic mass  = number of protons + number of neutrons

   Atomic number  = number of protons

number of protons  = 18

In a neutral atom, number of protons equals number of electrons

  number of electrons  = 18

Number of neutrons  = atomic mass - atomic number

Number of neutrons  = 40 - 18  = 22

18 protons, 18 electrons and 22 neutrons