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The distance from the Earth to the Moon is 238,900 mi. What is the distance in inches?

Explanation:

Chlorine is an element in group 7 on the periodic table.

  It is the second element in this group of halogens

 The element has a total of 17 electrons:

Ground state configuration  = 1s² 2s² 2p⁶ 3s² 3p⁵

Valence electrons are the outermost shell electrons;

  From the configuration: 3s² 3p⁵ is the valence shell

           Number of electrons  = 2 + 5  = 7

Answer:

B

Explanation:

Answer:

BBBBBBBBB

Explanation:

The volume of NaOH needed is 29.6ml, mass of solute is 35g, concentration is 0.438M and the number of moles is 10.8 moles.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

2) Initial concentration of NaOH = 2.1M

Final concentration of NaOH = 0.2M

Final volume of NaOH = 311 ml

Initial concentration × Initial volume = Final concentration × final volume

2.1 × volume = 0.2 × 311

volume = 29.6 ml

3) Percent of the solute = 14%

This means that 14 g is dissolved in 100 ml

Volume = 250 ml

Mass of solute in 250 ml = 0.14 × 250

= 35 g

4) Mass of NaCl = 21.4g

Volume = 1200ml = 1.2L

Concentration = moles × Volume

Moles = 21.4 / 58.5

= 0.365 moles

Concentration = 0.365 × 1.2

=0.438M

5) Volume = 460ml = 0.46 L

Concentration = 5M

Moles = concentration / volume

= 5 / 0.46

= 10.8 moles

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Vanadium (V)

Vanadium is the only one in the 4th period here so

Answer:

SO2           +        H2O      →       H2SO3 

Explanation:

Solution

SO2           +        H2O      →       H2SO3 

Sulphur dioxide          Water              Sulphurous acid 

Answer:

Sulphur dioxide Water Sulphurous acid.

Each of the five test tubes was supposed to have hydrogen peroxide and pH 4 solution was added as its only contents.

What is hydrogen and its uses?

Many other applications exist for hydrogen. It is used by the chemical industry to generate ch4 and methanol, that are intermediate as in synthesis of polymers and medications, in addition to ammonia for soil amendment (the Haber process). With in course of a petroleum process, it's also employed to remove sulfur in fuels.

Why is hydrogen not used as a fuel?

However, it is not utilized as a household fuel for a number of reasons: Because it is expensive to produce and is not readily available, hydrogen.

Hydrogen is less common in the environment than other gases.

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Answer:

Explanation:

If the pOH of a cesium hydroxide solution is known to be 6.00, what is the [OH−]

?_____ M

The fact that solar systems only generate electricity during the day is typically not a problem because demand for electricity is often highest during the day, which coincides with when solar panels are producing electricity.

During daytime hours, people are usually awake and more active, using appliances, electronics, and other devices that require electricity. Solar systems can help meet this increased demand by producing electricity when it's needed most.

Additionally, many photovoltaic cells continue to generate electricity through the night due to stored energy. Furthermore, solar systems are often located in deserts, which have high levels of sunlight, and currently do not produce much electricity on a global scale.

Finally, the electricity generated during the day can also be used to power Stirling engines, which can convert heat into mechanical energy and then into electricity.
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The fact that solar systems only generate electricity during the day is typically not a problem because the demand for electricity is often highest during the day.

Additionally, advancements in photovoltaic cell technology have allowed many cells to continue generating electricity through the night. Moreover, the electricity generated by solar systems can also be used to power Stirling engines, which can convert heat energy into mechanical energy. While it is true that solar systems are often located in deserts, this is not the only reason why the daytime generation of electricity is not a problem. Furthermore, while solar energy currently only produces a small fraction of the world's electricity, its usage is growing rapidly, and it is expected to play a significant role in meeting future energy demands.

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Answer:

Nvr XD

Explanation:

Answer:

the world may never know

Explanation:

The pH of a buffer solution can be calculated by the following equation: pH=pKa+log[base/acid]Given that the buffer solution is 0.550 M in a weak acid with Ka = 2.3 × 10⁻⁶, and 0.270 M in its conjugate base.

We can solve for pH by plugging in the values of pKa and the concentrations of the acid and base in the above equation.

We know that pKa is the negative log of Ka.pKa = -log Ka = -log 2.3 × 10⁻⁶ = 5.64pH = 5.64 + log (0.270/0.550)= 5.64 - 0.26= 5.38Therefore, the pH of the given buffer solution is 5.38.

A buffer is a solution that can resist changes in pH.

It is composed of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffering capacity is maximized when the pH of the buffer is equal to the pKa of the weak acid in the buffer solution.

If the pH of the buffer is less than the pKa, the buffer will have more acid than base, and if the pH is greater than the pKa, the buffer will have more base than acid.In the given problem, we have a buffer solution that is 0.550 M in a weak acid with Ka = 2.3 × 10⁻⁶, and 0.270 M in its conjugate base.

Using the Henderson-Hasselbalch equation, we can calculate the pH of the buffer. The Henderson-Hasselbalch equation states that pH is equal to the pKa plus the logarithm of the concentration of the conjugate base over the concentration of the weak acid, as shown above.

After plugging in the values of pKa and the concentrations of the acid and base, we obtain a pH of 5.38 for the buffer solution.

This pH is less than the pKa of the weak acid, which indicates that the buffer has more acid than base. Therefore, this buffer solution is an acidic buffer with a pH of 5.38.

The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation. The pH of a buffer solution is equal to the pKa plus the logarithm of the concentration of the conjugate base over the concentration of the weak acid. The given buffer solution is 0.550 M in a weak acid with Ka = 2.3 × 10⁻⁶, and 0.270 M in its conjugate base, and has a pH of 5.38, which indicates that it is an acidic buffer.

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there are approximately 140.14 grams in \(8.6 * 10^{23}\) molecules of \(H_2SO_4\).

To find the number of grams in \(8.6 * 10^{23}\) molecules of \(H_2SO_4\), we first need to determine the molar mass of \(H_2SO_4\). The molar mass is calculated by adding the atomic masses of all the atoms in the compound:
\(H_2SO_4\) contains:
- 2 Hydrogen atoms (H) with an atomic mass of approximately 1 g/mol each
- 1 Sulfur atom (S) with an atomic mass of approximately 32 g/mol
- 4 Oxygen atoms (O) with an atomic mass of approximately 16 g/mol each
The molar mass of \(H_2SO_4\) is therefore: (2 x 1) + 32 + (4 x 16) = 98 g/mol.
Now that we have the molar mass, we can use Avogadro's number, which is \(6.022 * 10^{23}\) molecules/mol, to find the number of moles in the given molecules:
Moles = (\(8.6 * 10^{23}\) molecules) / (\(6.022 * 10^{23}\) molecules/mol) ≈ 1.43 mol
Finally, to find the grams of \(H_2SO_4\), we multiply the moles by the molar mass:
Grams = 1.43 mol x 98 g/mol ≈ 140.14 g

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Answer:

In scientific ecology, climax community or climatic climax community is a historic term for a boreal forest community of plants, animals, and fungi which, through the process of ecological succession in the development of vegetation in an area over time, have reached a steady state.

Explanation:

Answer:

The first one is Propane

The second one is HEPTANE

The third one is octane

The 4th is butane

the 5th is decane

The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.

The images has been the representation of the ball and stick structure of the compounds. The central balls have been the representation of the carbon atom , with small balls attached to the sticks have been the representation of the hydrogen attached.

The following structures has been given as:

The structures have been named according to IUPAC as \(\rm C_3H_8\) Propane, \(\rm C_7H_{16}\) Heptane, \(\rm C_8H_{18}\) Octane, \(\rm C_4H_{10}\) Butane, and \(\rm C_{10}H_{22}\) Decane.

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2.50 litres of a 10.0 M solution require the preparation of 25.0 moles of ethylene glycol.

Excellent antifreeze, anti-boil, and anti-corrosive qualities are produced when antifreeze and water are mixed in a 50/50 ratio. The proportion of conventional ethylene glycol to water in severely cold conditions can reach 70% antifreeze, 30% water. The maximum antifreeze to water ratio when using DEX-COOL® is 60/40.

moles = concentration (M) x volume (L)

Given that the desired concentration is 10.0 M and the volume needed is 2.50 L, the setup for calculating the total number of moles of ethylene glycol can be written as:

moles = 10.0 M x 2.50 L

moles = 25.0 mol

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The component of a qPCR that contains salts and other buffering components to provide the correct chemical environment for the reaction to work is the reaction buffer.

The reaction buffer is a crucial component of qPCR as it contains all the necessary reagents needed for the amplification of the target DNA sequence. The buffer's function is to maintain a stable pH, regulate the ionic strength, and provide the necessary cofactors needed for the PCR reaction to occur. These include magnesium ions, which are essential for the activity of the DNA polymerase enzyme, and dNTPs, which are the building blocks for DNA synthesis.

The buffer also contains stabilizers and additives to prevent degradation of the DNA or enzymes during the reaction. Overall, the reaction buffer is a critical component of qPCR that ensures the reaction occurs under optimal conditions, leading to accurate and reliable results. The component of a qPCR that contains salts and other buffering components to provide the correct chemical environment for the reaction to work is the reaction buffer.

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There are 24 valance electrons in the compound.

We know that the valence electrons are those that are found on the valence shell of an atom. There are four atoms that can be seen in the compound that is under consideration. The atoms are selenium, bromine (2 atoms) and oxygen.

Given that there are seven valence electrons in bromine and six valence electrons in oxygen and selenium. We have;

2(7 electrons of bromine) + 6 electrons of oxygen + 4 electrons of Se

= 24 electrons

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Answer:

0.67 atm

Explanation:

From the question,

Applying Boyles law

PV = P'V'......................... Equation 1

Where P = Initial Pressure of the sample of gas, P' = Final pressure of the sample of gas, V = Initial volume of the sample of gas, V' = Final volume of the sample of gas.

make P' the subject of the equation above

P' = PV/V'.................... Equation 2

Given: P = 10.0 L, V = 1.0 atm, V' = 15.0 L

Substitute these values into equation 2

P' = (10.0×1.0)/15.0

P' = 0.67 atm

Answer:

Willow is correct because as things age and mature more, usually the more better they are.

Explanation:

To elaborate, you can perceive the development of the modern day atomic model as one aging and maturing. There's usually a correlation between age/maturity and knowledge, the same is true for the atomic model and other scientific theories.

Answer:

The number of protons in an atom is different than the atom’s total mass.  

Explanation:

Mendeleev knew only that, with some anomalies, the properties of elements varied periodically with their atomic masses.

Moseley's X-ray experiments enabled him to remove these anomalies and to show that the properties of elements varied with their atomic numbers.  

Chadwick later discovered that the mass differences were caused by the presence of neutrons.

The speed of the rock after 10 seconds of free fall would be approximately 122 meters per second (274 mph).

What is rock?

Rock is a solid material composed of a combination of minerals, such as quartz, feldspar, mica, and other minerals. Rocks are formed by the process of weathering, erosion, and deposition of material from the Earth's crust, which is composed of rock materials. Rocks are classified based on their composition and origin. The three main types of rocks are sedimentary, igneous, and metamorphic. Sedimentary rocks form from sediments that are transported and deposited by water, wind, or ice. Igneous rocks form when molten rock material cools and crystallizes. Metamorphic rocks form when existing rocks are changed by intense heat and pressure. Rocks are an important part of the Earth's surface and are used in many applications, such as construction, landscaping and the production of certain materials. Rocks can also provide information about the geologic history of an area.

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In the given query, the rate law for the reaction: \(\rm A \rightarrow B\) if the rate constant, k, is 0.25 M⁻¹ s⁻¹ at 75°C is Rate = \(\rm 0.25\ M^{-1} s^{-1 }[A]^2\). Option b is the correct answer.

The rate law is an equation that depicts how the rate of a chemical reaction depends on the concentrations of the reactants.

Given: \(\rm A \rightarrow B\)

k= 0.25 M⁻¹ s⁻¹ at 75°C

Based on the rate constant, the given reaction is second order reaction. The rate law can be written as:

\(\rm Rate \propto k[A]^ 2\)

Where k is the rate constant and [A] is the concentration of A.

\(\rm Rate = k[A]^ 2\)

Putting the value of k in the above equation, we get:

\(\rm Rate= 0.25 M^{-1} s^{-1} [A]^ 2\)

Therefore, Option b. "Rate = \(\rm 0.25\ M^{-1} s^{-1 }[A]^2\)" is the correct choice.

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Answer:

Explanation:

Hello friend!!!!!

here's ur answer

The unit to describe volume is cubic meter.

Hope this helps

plz mark as brainliest!!!

Like any other equilibrium constant, kw is also affected by temperature. the kw at 75 degrees Celsius is 1.995 x 10⁻¹³. Therefore, 13 is the pOH of water at this temperature.

The concentration of hydroxide ions (OH-) is measured by pOH. It is utilized to express a solution's alkalinity.

Aqueous solutions having pOH less than 7 at 25 degrees Celsius are alkaline, pOH larger than 7 are acidic, while pOH equal with 7 are neutral. pH and hydrogen ion concentration is used to compute pOH.

Kw = [OH⁻] [H⁺]

1.995 x 10⁻¹³ = Kw

[OH⁻] =[H⁺]

Kw = [OH⁻]²

[OH⁻] =10⁻¹³

pOH = -log  [OH⁻]

       = - log  10⁻¹³

      = 13

Therefore,  13 is the pOH of water at this temperature.

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Answer:

the answer is b and c.

Explanation:

got it right on edge 2021

An example of a fission reaction is as follows:

²³⁹Pu₉₄ + n¹₀⇒¹⁴⁴Ce₅₈ + ⁹⁴Kr₃₆ + ¹n₀

²⁴¹Am₉₅ + ¹n₀ ⇒ ¹⁴⁴La₅₇ + ⁹⁵Sr₃₈ + ¹n₀

A fission reaction is a type of nuclear reaction in which the nucleus of an atom is split into two or more smaller nuclei, along with the release of a large amount of energy and several neutrons. This process occurs when the nucleus of an atom absorbs a neutron and becomes unstable, causing it to split apart.

Fission reactions can occur naturally, as in the decay of certain radioactive isotopes, or can be induced by bombarding a nucleus with high-energy particles.

Fission is also the process used in nuclear power plants to generate electricity, where the heat produced by the fission reaction is used to produce steam that drives turbines.

Thus, options B and C are correct.

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Answer:

Ethanol is the odd one.....

Answer:

Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)

Explanation:

Answer:

Reacts with salt to from an acid