Which one of the following molecules has two lone pairs of electrons on the central atom? OCl2 PCl3 CO2 SO2

a. 4.2 x 10⁻¹³ J

b. 6.3 x 10⁻²⁰ J

c. 7 x 10⁻¹⁸ J

Radiation energy is absorbed by photons

The energy in one photon can be formulated as

\(\large{\boxed{\bold{E\:=\:h\:.\:f}}}\)

Where

h = Planck's constant (6,626.10⁻³⁴ Js)

f = Frequency of electromagnetic waves

a.

\(\tt E=6.626.10^{-34}\times 6.32.10^{20}=4.1876.10^{-13}~J\)

b.

\(\tt E=6.626.10^{-34}\times 9.50.10^{13}=6.2947.10^{-20}~J\)

c.

\(\tt E=6.626.10^{-34}\times 1.05.10^{16}=6.9573.10^{-18}~J\)

Answer:

Nitrogen is an inert gas — meaning it doesn't chemically react with other gases — and it isn't toxic. But breathing pure nitrogen is deadly. That's because the gas displaces oxygen in the lungs. Unconsciousness can occur within one or two breaths, according to the U.S. Chemical Safety and Hazard Investigation Board.

Answer:

because it is an insert gas and it is very dangerous for ear and our nose

The main difference between a colloid and solution lies in the size of the particles dispersed in the medium.

1. Colloid: A colloid is a mixture in which tiny particles (between 1 nanometer and 1 micrometer in size) are dispersed evenly throughout a continuous medium. The dispersed particles do not settle and remain suspended due to their relatively larger size. Examples of colloids include milk, fog, and gelatin.

2. Solution: A solution is a homogeneous mixture in which the particles are molecular or ionic in size (less than 1 nanometer) and are uniformly distributed throughout a solvent. The particles in a solution are so small that they do not scatter light, and the mixture appears transparent. Common examples of solutions include saltwater, sugar dissolved in water, and air.

In summary, the key distinction between a colloid and a solution lies in the size of the dispersed particles. Colloids have larger particles that remain suspended, resulting in a cloudy or opaque appearance, whereas solutions have much smaller particles that are molecular or ionic in size and result in a clear and transparent mixture. Understanding this difference helps to differentiate between these two types of mixtures in various scientific and everyday contexts.

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Answer :position

Explanation:

Potential energy is the energy stored in an object due to its position

33 grams of CO₂ will be produced from 12.0 g of CH₄ and 133 g of O₂ using the concept of 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,

Mass of methane = 12g

Mass of oxygen = 133g

Moles of methane = mass / molar mass

= 12 / 16 = 0.75 moles

Moles of oxygen = mass / molar mass

= 133 / 32 = 4.156 moles

Since moles of methane are lesser, it is the limiting reagent.

1 mole of methane gives 1 mole of carbon dioxide

Moles of carbon dioxide = 0.75 moles

mass of carbon dioxide = 0.75 × 44

= 33g

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Answer:

6FCRXCTV

Explanation:

Answer:

b

Explanation:

a p e x

Answer:

The value of the Golden Igloo is $227.4 million.

Explanation:

First, we need to find the inner and the outer volume of the half-spherical shell:

\( V_{i} = \frac{1}{2}*\frac{4}{3}\pi r_{i}^{3} \)

\( V_{o} = \frac{1}{2}*\frac{4}{3}\pi r_{o}^{3} \)

The total volume is given by:

\( V_{T} = V_{o} - V_{i} \)

Where:

\( V_{i} \): is the inner volume

\(r_{i}\): is the inner radius = 1.25/2 = 0.625 m

\( V_{o} \): is the outer volume

\(r_{o}\): is the outer radius = 1.45/2 = 0.725 m

Then, the total volume of the Igloo is:

\( V_{T} = \frac{2}{3}\pi r_{o}^{3} - \frac{2}{3}\pi r_{i}^{3} = \frac{2}{3}\pi [(0.725 m)^{3} - (0.625 m)^{3}] = 0.29 m^{3} \)

Now, by using the density we can find the mass of the Igloo:

\( m = 19.3 \frac{g}{cm^{3}}*0.29 m^{3}*\frac{(100 cm)^{3}}{1 m^{3}} = 5.60 \cdot 10^{6} g \)

Finally, the value (V) of the antiquity is:

\( V = \frac{\$ 1263}{oz}*5.60 \cdot 10^{6} g*\frac{1 oz}{31.1034768 g} = \$ 227.4 \cdot 10^{6} \)  

Therefore, the value of the Golden Igloo is $227.4 million.

I hope it helps you!  

The specific heat of the metal is approximately 0.169 J/g·°C.

To determine the specific heat of the metal, we can use the formula:

q = m * c * ΔT

where q is the heat energy absorbed by the metal, m is the mass of the metal, c is the specific heat of the metal, and ΔT is the change in temperature.

In this case, we have a mass of 25.0 g, a temperature change of 6.1 °C, and an energy input of 259 J.

Rearranging the formula, we can solve for c:

c = q / (m * ΔT)

Substituting the given values:

c = 259 J / (25.0 g * 6.1 °C)

c ≈ 0.169 J/g·°C

This value indicates that the metal requires 0.169 Joules of energy to raise the temperature of 1 gram of the metal by 1 degree Celsius. The specific heat value is a characteristic property of the metal and can be used to identify the metal or compare it to known values for different metals.

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The structural formula of 3-ethoxy-2-methylhexane can be written as CH3CH(CH3)CH(CH3)CH2CH2OCH2CH3. In this molecule, there is a six-carbon chain that contains two methyl groups and an ethoxy group. The ethoxy group is attached to the third carbon atom of the chain, while the methyl groups are attached to the second and fourth carbon atoms. The remaining two carbon atoms are attached to the fifth and sixth positions respectively.

The molecule is named as 3-ethoxy-2-methylhexane since the ethoxy group is attached to the third carbon atom of the hexane chain.

The total number of carbon atoms in the molecule is six, which gives it the name of hexane. Overall, 3-ethoxy-2-methylhexane is an organic compound that is used in various industrial applications.
Hi! I'm happy to help you understand the structural formula of 3-ethoxy-2-methylhexane. First, let's break down the name to identify the components of the molecule:

- "Hexane" is the base structure, indicating a six-carbon alkane chain.
- "3-ethoxy" means that an ethoxy group (CH3CH2O-) is attached to the third carbon atom in the hexane chain.
- "2-methyl" indicates a methyl group (CH3) attached to the second carbon atom in the hexane chain.

Now, let's construct the structural formula:

CH3-CH(CH3)-CH(OCH2CH3)-CH2-CH2-CH3

In this formula:

- The hexane chain is represented by the sequence of CH3, CH, CH, CH2, CH2, and CH3.
- The methyl group (CH3) is attached to the second carbon atom, indicated by the CH in parentheses.
- The ethoxy group (OCH2CH3) is attached to the third carbon atom, shown within the parentheses of the CH(OCH2CH3) part.

I hope this helps you understand the structural formula of 3-ethoxy-2-methylhexane! If you have any more questions, feel free to ask.

Answer:yes

Explanation:

this is because the distance doesnt matter

The type of reaction which occurs when the oxidation numbers of 2 or more atoms change is an oxidation-reduction{redox} reaction.

A redox (redox) reaction is a type of chemical reaction in which electrons are transferred between two species redox reaction is a chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.

There  are 2 classes of redox reactions  which are:

electron transfer where electrons flow from the reducing agent  to the oxidant

atom transfer atom transfers an atom from one substrate to another

There are different types of redox reactions which are:

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Answer:

B

Explanation:

The pH of the solution is approximately 5.935, which corresponds to answer choice (d).

The first step to answering this question is to write out the balanced equation for the dissociation of HCN in water: HCN + H2O ⇌ H3O+ + CN-.

Next, we need to calculate the concentration of HCN in the solution. We can use the formula n = m/MM to calculate the number of moles of HCN present:

n = 1.85 g / 27.02 g/mol = 0.068 moles HCN

We can then use the formula c = n/V to calculate the concentration of HCN in the solution:

c = 0.068 moles / 3.50 L = 0.0194 M HCN

Now, we can use the Ka value given in the question to calculate the concentration of H3O+ in the solution:

Ka = [H3O+][CN-] / [HCN]

Let x be the concentration of [H3O+] and [CN-] in the solution. Then we can write:

Ka = x^2 / 0.0194 - x

Simplifying this expression, we get a quadratic equation:

x^2 + 6.2 x 10^-10 x - 1.2 x 10^-12 = 0

Solving this quadratic equation, we get:

x = 1.165 x 10^-5 M

Finally, we can use the formula pH = -log[H3O+] to calculate the pH of the solution:

pH = -log(1.165 x 10^-5) = 5.935

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The first one appear to be a pan with some liquid heating up.

The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.

The second one seems to be a ice cube melting.

Its beginning phase is solid, the phase change type is fusion, and its ending state is liquid.

The third one is water, or other liquid, making clouds.

The beginning state is liquid, the phase change type is a vaporization and its ending state is gas.

The fourth illustration seems to be an aluminium can. There aren't really a phase change happening, but when we open the aluminium can containing gaseous drink, there are molecules of gas diluted into the liquid and some of it encouter each other to make a bubble of the gas and is released. It is not an actually phase change, it is the reverse process of diluting gas into liquid. Initially it is diluted gas, it gets released and in the end it is in gas phase.

Answer:

48 000 cm^2

Explanation:

8000      1cm cubes

 each 1 cm cube side is  1 cm^2   and there are six sides to the cube , so each cube has   6 cm^2  surface area

  and there are  8000 of them     8000 * 6 cm^2 = 48 000 cm^2

The complete ground-state electron configuration for Aluminum is 1s^2, 2s^2, 2p^6, 3s^2, 3p^1.

The term electronic configuration is defined as the arrangement of electrons in orbitals around an atomic nucleus.

The four types of orbitals (s,p,d, and f) have different shapes, and each orbital can only hold two electrons. Because the sublevels of the p, d, and f orbitals differ, they can hold more electrons. As previously stated, each element's electron configuration is unique to its position on the periodic table.

Aluminum-27 has a total of 13 electrons. According to the Periodic Table, its ground state configuration is 2-8-3. 2-7-4 is a possible excited state configuration.

Thus, The complete ground-state electron configuration for Aluminum is 1s^2, 2s^2, 2p^6, 3s^2, 3p^1.

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Answer:

They share an outer electron.

Explanation:

For complementary reasons, sodium and chlorine are both highly reactive. Sodium has a single electron in its outermost, third shell, and chlorine has one electron less than eight in its outermost, fourth shell. They form a strongly bound molecule by sharing that outer electron.

Answer:Question

Select the correct answer. Sami was blowing soap bubbles in his room where the temperature was 23 °C and the pressure was constant. He blew a soup bubble of volume 45 mL. The bubble suddenly escaped from the window where the temperature outside was 12 °C. Explain what will happen to the soap bubble? The volume of the soap bubble will increase to 46.73 mL. The volume of the soap bubble will increase to 86.25 mL. The volume of the soap bubble will decrease to 23.47 mL. The volume of the soap bubble will decrease to 43.33 mL.​

Explanation:

Question

Select the correct answer. Sami was blowing soap bubbles in his room where the temperature was 23 °C and the pressure was constant. He blew a soup bubble of volume 45 mL. The bubble suddenly escaped from the window where the temperature outside was 12 °C. Explain what will happen to the soap bubble? The volume of the soap bubble will increase to 46.73 mL. The volume of the soap bubble will increase to 86.25 mL. The volume of the soap bubble will decrease to 23.47 mL. The volume of the soap bubble will decrease to 43.33 mL.​

The ratio of the molecular weights of the two gases is 1:9, which can be determined using Graham's law of effusion/diffusion, where the rate of diffusion is inversely proportional to the square root of molecular weight.

According to Graham's law of diffusion, the rate of diffusion of a gas is inversely proportional to the square root of its molecular weight. Therefore, if the ratio of the rate of diffusion of two gases is 1:3, then the ratio of the square roots of their molecular weights will also be 1:3. This means that the ratio of their molecular weights will be the square of this ratio, which is 1:9. So, the molecular weight of the heavier gas will be nine times that of the lighter gas. This relationship is important in various applications, such as in the separation of gases in industry and in understanding the diffusion of gases in the atmosphere.

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transition metals are good conductors of heat and electricity and it can hammered  into shape easily and have high melting points.

Transition metal are the chemical elements which have valence electron and it can participate in chemical bonds formation process in two shells.

The position of the transition metals in periodic table is the middle portions of the long periods between the groups on the left-hand side and the groups on the right.

Most of the transition metals  are hard, strong, and lustrous and it has high melting and boiling points, good conductors of heat and electricity.

Some of the elements are important technologically are titanium, iron, nickel, and copper as they are used in electrical technology.

Other transition metals are used in useful alloys, with one another and with other metallic elements, dissolve in mineral acids, platinum, silver, and gold are some Nobel transition metal.

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Answer:

H2SO4 + 2 LiOH → Li2SO4 + 2 H2O - Balanced equation | Chemical Equations online!

Based on the appearance of the reaction of aluminum with copper (II) sulfate, the reagent that was consumed was aluminum, and the reagent that had some left over was copper (II) sulfate.

Aluminum is a chemical element that has the symbol Al and the atomic number 13. It is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. Aluminum is the third most prevalent element and the most abundant metal in the Earth's crust after oxygen and silicon.

Copper (II) sulfate is a blue solid that is soluble in water. Its appearance is due to the presence of water of crystallization, which occurs in the crystal structure. It is a compound that is commonly used as a fungicide and algaecide because it is toxic to many fungi and algae. Copper sulfate has also been used to treat various diseases.

Aluminum replaces the copper ions in copper (II) sulfate and creates aluminum sulfate and copper metal when aluminum reacts with copper (II) sulfate. The chemical reaction between aluminum and copper (II) sulfate is as follows:

Al(s) + CuSO4(aq) ⟶ Al2(SO4)3(aq) + Cu(s)

When aluminum is placed in copper (II) sulfate solution, copper ions from copper (II) sulfate move to aluminum, displacing the aluminum ions in the process. As a result, the copper ions from copper (II) sulfate solution are lowered to metallic copper, and aluminum ions combine with sulfate ions from copper (II) sulfate solution to form aluminum sulfate, which is soluble in water. When copper metal is produced, it forms a brown layer on top of the solution and sinks to the bottom.

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Place the cursor at the start of the text, then press CTRL+SHIFT+DOWN ARROW. Press CTRL+SHIFT+UP ARROW after advancing the cursor to the end of the paragraph. The Correct option is B.

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The ddt in the soil with half-life of 12 years needs 44.4 years to decompose.

We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation

N = No(1/2)^(t/t'')

where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.

From the question above, we know that

t'' = 12 yr

N = 15 ppbm

No = 195

By substituting the given parameter, we can calculate the required for decomposing

N = No(1/2)^(t/t'')

15 = 195(1/2)^(t/12)

1/13 = (0.5) ^ (t/12)

t/12 = ⁰'⁵log(1/13)

t/12 = 3.7

t = 44.4 years

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Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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Answer:

Igneous rocks must go through the sedimentary process to change into metamorphic rocks. Igneous rocks are chemically changed into metamorphic rocks because of high temperature and pressure. Metamorphic rocks are formed from melting igneous rocks. Metamorphic rocks and igneous rocks do not follow a rock cycle.

Explanation:

hope this helps!

Answer:

C

Explanation:

It's igneous rocks must go through the sedimentary process answer thing

Answer:

this is not good

Explanation:

alost got the asnwe

s