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Among the given mediums, Vaccuum is the best thermal insulator to reduce the transfer of thermal energy by radiation as there will be no air particles which carries heat from one place to other. Hence, Option (D) will be the correct option

Heat Radiation refers to the transfer of heat from a hot body to cold body directly, without heating the medium between two bodies.

Vaccum does not have any particles in it. Thus, there will be no transfer of heat through it.

The best example of it is thermous flask in which vaccuum inside thermous flask reduces the transfer of energy through it.

Hence,Among the given mediums, Vaccuum is the best thermal insulator to reduce the transfer of thermal energy by radiation as there will be no air particles which carries heat from one place to other. Thus, Option (D) will be the correct option

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The earth's mantle will not change in the future because this region is safe from the intervention of human beings.

The transfer of heat and material in the mantle helps us to determine the landscape of Earth. Activity in the mantle moves the plate tectonics, that contributes to volcanoes, seafloor spreading, earthquakes, and building of mountains.

So we can conclude that the earth's mantle will not change in the future because this region is safe from the intervention of human beings.

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Answer: A

Explanation:

9 protons correspond to fluorine.

The two dark vertical lines in the spectrum shows that all wavelengths except those two cause an electron to move to a lower energy level. Hence, Option (D) is correct

A spectrum of electromagnetic radiation transmitted through a substance, showing dark lines or bands due to absorption at specific wavelengths.

The given fact is explained by the energy levels that electrons may be in are quantized, or vary by a specific amount.

When electrons go from one energy level to another, the difference in those energy level is a specific value, and not a range of values.

If they are transitioning upwards towards a higher energy, they will absorb the photons corresponding to the wavelength of light which has the specific amount of energy they need to ascend, resulting in dark lines.

Similarly, when the electrons transition from higher to lower energy, the same specific amount of energy is released and the emission spectrum shows lines in the places where the absorption spectrum was dark.

Hence, The two dark vertical lines in the spectrum shows that all wavelengths except those two cause an electron to move to a lower energy level. Therefore, Option (D) is correct

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The mineral that's illustrated based on the information given will be magnetite.

A mineral simply means any pure substance that has a unique composition and structure.

Since the mineral is black and will stick to you when you walk through the sand at the beach, it's magnetite.

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The carbocation stabilized by resonance structure and thereby lowers the energy of the carbocation, hydrogen will add to the carbon in the double bond that produces delocalization of electrons.

A carbocation is a molecule in which a carbon atom has a positive charge and three bonds.

In general, electrons are stabilized by delocalization. The stabilization energy engendered by delocalization over more than two atoms is called the resonance stabilization energy or simply the resonance energy. The greater the extent of electron delocalization the greater the resonance stabilization.

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Answer:

27 gm

Explanation:

Well..... the volume of the copper is   3 cm^3

9.0  g/cm^3    * 3 cm^3 = 27 gm

The moderately reactive atoms located in the periodic table are fluorine, chlorine, bromine, and iodine which means the halogens family.

The number of balance electrons of the light metals compared to those heavier by listing elements in the order of increasing atomic number.

They are the five non-metals in family 7A of the periodic table. Halogens are chemical elements that form inorganic salts. In the periodic table they are part of group 17 or family 7A.

Halogens are strong oxidants and react mainly with alkali metals (Family I A) which tend to donate an electron. They also react with metals and noble gases (Family VIII A).

The chemical elements are arranged from left to right and top to bottom in order of increasing atomic number, or the number of protons in an atom's nucleus, which generally coincides with increasing atomic mass.

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What are halogen metals?

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A food processing company might use titration to calculate the precise amount of salt in a particular food stuff.

A process of determining the concentration of a dissolved substance in terms of the smallest amount of reagent of known concentration required to bring about a given effect in reaction with a known volume of the test solution

The general source of error in titration has been;

A food processing company might use titration to calculate the precise amount of salt in a particular food stuff.

It can also be used to determine the concentration of vitamin C or vitamin E additives in foods.

Universal indicator can also work as the indicator in the lab.

When universal indicator is added to a solution, the color change can indicate the approximate pH of the solution.

Acids cause universal indicator solution to change from green toward red whereas, bases cause universal indicator to change from green toward purple.

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The theoretical yield of the product is 204 g of the product .

The theoretical yield is the yield of the reaction as obtained from the stoichiometry of the reaction.  

The reaction equation is given as 4Al + 3O2 → 2Al2O3

Number of moles of Al = 54.0 g/27 g/mol = 2 moles

Number of moles of oxygen = 64.0 g/32 g/mol = 2 moles of O2

Hence,

If 4 moles of Al yields 2 moles of Al2O3 then 204 g of the product is obtained.

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Answer: 102

Explanation:

Answer:

1.54 × 10²⁰ molecules

Explanation:

Dividing the mass by the molar mass, we get the number of moles to be (0.045)/(176.12), which is about 0.0002555 mol.

Avogadro's law states that there are 6.022 × 10²³ molecules in one mole of a substance, so the answer is

(0.0002555)(6.022 × 10²³), which is 1.54 × 10²⁰ molecules.

Answer:

A scientist measures the standard enthalpy change for the following reaction to be -139.5 kj :

h2(g) + c2h4(g)c2h6(g)

based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of c2h4(g) is _____ kj/mol

Explanation:

Hydrogen ΔHof (kJ/mol) ΔGof (kJ/mol) So (J/mol K)

H2 (g)

0

0

130.7

Carbon ΔHof (kJ/mol) ΔGof (kJ/mol) So (J/mol K)

C2H6 (g)

-84.7

-32.8

229.6

The remaining moles of C is 5.01 moles while the remaining moles of F₂ is 0.

The reaction between carbon and Fluorine is given as;

C + 2F₂  -------> CF₄

1  :    2                1

from the reaction above,

2 moles of F₂ requires 1 mole of C

7.88 mole of  F₂ will require:    7.88/2 = 3.94 moles of C and 3.94 moles of CF₄.

The remaining moles of C = 8.95 - 3.94 = 5.01 moles while the remaining moles of F₂ is 0.

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Answer:

Its main advantage is they information fits on one line of text (thus works well when using the formula in paragraphs). Disadvantages are they can be confusing for larger molecules

hope this helps :3

Answer:

Nothing will happen until you remove the thermometer.

Explanation:If the thermometer is made of mercury in glass, nothing will happen….mercury does not freeze at the temperatures in the refrigerator…

Explanation:

c and d. I'm not sure which one is better tho

Nitrogen fixation is the part of the nitrogen cycle where the nitrogen is fixed as nitric oxide. Urea {CON₂H₄} should be added to fertilizer to get the best results. Thus, option B is correct.

Fertilizers are substances that are composed of organic and inorganic compounds that are used to provide nutrients to the plants and crops for growth, development, pest, and insect resistance.

The fertilizers mainly comprise nitrogen, potassium, and phosphorus. Urea {CON₂H₄} has the maximum concentration of nitrogen (46%) and will be the most effective.

The other compound ammonium nitrate {NH₄NO₃} contains 34%, ammonium sulfate { (NH₄)₂SO₄} which comprises 21% of nitrogen by mass, whereas N₂F₂ is not used as a fertilizer.

Therefore, option B. Urea {CON₂H₄} is best to use as fertilizer.

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Answer:

If an insufficient amount of nitrogen were produced, the air bag would under inflate and not provide adequate protection. Clearly, the stoichiometry of the reaction is very important.

The enthalpy of combustion of 1 mole of acetylene for the reaction using the information in the table (attached as figure) is - 1,256 kJ/mol

The enthalpy of combustion of a substance is defined as the heat energy given out when one mole of a substance burns completely in oxygen.

Hence, The enthalpy of combustion of 1 mole of acetylene for the reaction using the information in the table is - 1,256 kJ/mol

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The earth's mantle will not change in the future because this region is safe from the intervention of human beings.

The transfer of heat and material in the mantle helps us to determine the landscape of Earth. Activity in the mantle moves the plate tectonics, that contributes to volcanoes, seafloor spreading, earthquakes, and building of mountains.

So we can conclude that the earth's mantle will not change in the future because this region is safe from the intervention of human beings.

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Answer:

37 Degrees Celsius

Explanation:

Answer:

D. A person going down a water slide

Explanation:

There is a store of gravitational potential energy when they are at the top of the waterslide which is then converted to kinetic energy as they travel down. The gravitational potential energy is transferred because the person loses height as they go down the slide

One of the postulates in John Dalton's atomic theory was later subjected to change was that Various scientists found that atoms consist of subatomic particles with varying mass and charge. option C is correct.

An atom is consist of three sub atomic particles called proton, neutrons and electrons also known as the fundamental nit of an atom.

Atom consist of an nucleus into which proton and neutrons are present and protons are positively charged whereas neutrons are neutral and electrons revolve around the nucleus in the fixed paths called shells and negatively charged.

Therefore, the postulates in John Dalton's atomic theory was later subjected to change was that Various scientists found that atoms consist of subatomic particles with varying mass and charge. option C is correct.

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Answer:

D. some scientists found that bonds between atoms are broken rearranged or reformed during reactions. According to Dalton's other theories, this is the only one that differentiates from his original theories :)

Explanation:

A closer look at the triple beam balance shows that mass of the body is 52.5 g.

The term triple beam balance refers to an equipment that is used to determine the mass of an object. It has three different degrees of calibration as shown.

In this case, if we look at the beam balance well, we can see that the mass of the body is 52.5 g.

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The subshell that contains the valence electron for sodium is the s subshell

Valence electrons are the electrons located at the outermost shell of an atom

From the question, we are to determine the subshell that contains the valence electron(s) for sodium

The given electronic configuration for sodium is

1s²2s²2p⁶3s¹

The valence electron is the electron in the 3s orbital.

Hence, the subshell that contains the valence electron for sodium is s subshell

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The mass of Ba(IO3)2 that can be dissolved in 500 ml of water at 25 degrees celcius is 2.82 g

The Ksp of Ba(IO3)2 = 1.57 × 10^-9

Molar mass of Ba(IO3)2 = 487 g/mol?

Dissociation of Ba(IO3)2 produces 3 moles of ions as follows:

[tex]Ba(IO_{3})_{2} \leftrightharpoons Ba^{2+} + 2\:IO_{3}^{-}[/tex]

[tex]Ksp = [Ba^{2+}]*[IO_{3}^{-}]^{2}[/tex]

[tex][Ba(IO_{3})_{2}] = \sqrt[3]{ksp} =

\sqrt[3]{1.57 \times {10}^{ - 9} } \\ [Ba(IO_{3})_{2}] = 1.16 \times {10}^{-3} moldm^{-3}[/tex]

moles of Ba(IO3)2 = 1.16 × 10^-3 × 0.5 = 0.58 × 10^-3 moles

mass of Ba(IO3)2 = 0.58 × 10^-3 moles × 487 = 2.82 g

Therefore, mass Ba(IO3)2 that can be dissolved in 500 ml of water at 25 degrees celcius is 2.82 g.

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SF₆

Molar mass: 146.06 g/mol

mole = 25 : 146.06 = 0.171

molecules:

=0.171 x 6.02 x 10²³

=1.03 x 10²³

Answer:

Temperature and Volume

Explanation:

PV = n R T

P = n R T / V      pressure depends on the temperature and volume

The pressure of a gas depends on the temperature and volume of the gas.

PV = nRT

Where

From the equation given above, we obtained the following:

PV = nRT

Divide both sides by V

P = nRT / V

R is constant and n = 1

P = T / V

Thus, we can see that the pressure (P) is dependent on the temperature (T) and the volume (V)

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