Which Two process is it Giving brainliest 100 points

Answer:

b)

Explanation:

Resonance structure differ by placement of electrons only.

I hope you got the answer

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Answer:

im sorry but i havent reached that topic as of yet

Explanation:

Answer:

b i did the test

Explanation:

Join in tracks are designed with extra space to allow for friction in hot weather

Answer:

Joints in train tracks are designed with extra space to allow for expansion and contraction of the track material in hot weather.

Solution :

In the process to isolate gold that has a 80 percent yield, a 3.00 g of Au is being isolated.

That is, the actual yield of Au is 3. 00 g

Therefore, we need to find the theoretical yield.

As we know,

[tex]$\text{percent yield}=\frac{\text{actual yield}}{\text{theoretical yield}} \times 100$[/tex]

[tex]$\text{theoretical yield}=\frac{\text{actual yield}}{\text{present yield}} \times 100$[/tex]

As actual yield = 3.00 g

    percent yield = 80 %

So, theoretical yield = [tex]$\frac{3.00}{80} \times 100$[/tex]

                                  = 3.75 g

Thus he should be able to get 3.75 g which is the theoretical yield of Au.

Answer:

Mass of benzene required = 0.78 g

Explanation:

Given data:

Mass of CO₂ produced = 2.66 g

Mass of benzene required = ?

Solution:

Chemical equation:

2C₆H₆ + 15O₂       →    6H₂O + 12CO₂

Number of moles of CO₂:

Number of moles = mass/molar mass

Number of moles = 2.66 g/ 44 g/mol

Number of moles = 0.06 mol

Now we will compare the moles of CO₂ with C₆H₆.

                        CO₂       :        C₆H₆

                            12        :          2

                          0.06      :        2/12×0.06=0.01 mol

Mass of benzene required:

Mass = number of moles × molar mass

Mass = 0.01 mol × 78.11 g/mol

Mass = 0.78 g

Answer:

helium is the smallest element and francium is the largest

Answer:

K+ is the right answer

Explanation:

Answer:

pH = 9.25

Explanation:

Using H-H equation:

pH = pKa + log [A⁻] / [HA]

Where pH is pH of the buffer

pKa is pKa of the weak acid: 9.24

[A⁻] could be taken as moles of the conjugate base: Moles NH₃

[HA] moles of the weak acid: NH₄⁺

Initial moles of NH₃:

40.07mL = 0.04007L * (0.3542mol / L) = 0.01419mol

Initial moles NH₄⁺:

0.03501L * (0.3791mol / L) = 0.01327 mol

The HCl added reacts with NH₃ producing NH₄⁺:

HCl + NH₃ → NH₄⁺ + Cl⁻

Moles of HCl:

3.112x10⁻³L * (0.0896mol / L) = 0.00028 moles

That means moles of NH₃ and NH₄⁺ after the addition of HCl are:

NH₄⁺: 0.01327moles + 0.00028moles = 0.01355 moles

NH₃: 0.01419mol - 0.00028 moles = 0.01391 moles

pH of the buffer is:

pH = pKa + log [A⁻] / [HA]

pH = 9.24 + log [0.01391 moles] / [0.01355 moles]

Answer:

Explanation:

2C₄H₁₀ + 13O₂ = 8 CO₂ + 10H₂O

Change in number of moles Δn = 18 - 15 = + 3 moles .

ΔHo = -2658.3 kJ/mol.

ΔHo = ΔEo+ Δn RT

Δn = 3

For one mole Δn = 1.5

ΔHo = ΔEo+ W

W = Δn RT

= 1.5 x 8.31 x 298

= 3714.5 J

= 3.7 kJ /mole

ΔHo = ΔEo+ W

ΔEo =  ΔHo -  W

= -2658.3 - 3.7  kJ

= - 2662 kJ .

(a) The work done for the combustion of 1 mole of methane is 3,714.5 J.

(b) The change in the energy of the given system is -3,991.2 kJ.

The balanced chemical reaction of the given compounds is written as follows;

[tex]2C_4H_{10} \ + \ 13O_2 \ -->\ 8CO_2 \ + \ 10H_2 O[/tex]

The change in number of moles;

[tex]\Delta n = 18 - 15 = 3[/tex]

The work done for the combustion of 1 mole of methane is calculated as follows;

[tex]W = \frac{\Delta n}{2} RT\\\\W = \frac{3}{2} \times 8.31 \times 298\\\\W = 3,714.6 \ J[/tex]

The energy change is calculated as follows;

[tex]\Delta E_0 = \Delta H_o - W\\\\\Delta E_0 = (\frac{3 \ mole}{2} \times-2658.3 \ kJ/mol) - 3.715 \ kJ\\\\\Delta E_0 = -3,991.2 \ kJ[/tex]

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Answer:

[tex]m=0.0325g[/tex]

Explanation:

Hello!

In this case, since the collection of gases over at certain conditions implies the usage of the ideal gas equation and computation of the pressure of the gas by subtracting the vapor pressure of water (21.7 torr at 23.7 °C) to the total pressure as shown below:

[tex]p_N=706-21.7=684.3torr =0.900atm[/tex]

Next step is to compute the moles of nitrogen at the given conditions:

[tex]n=\frac{PV}{RT}=\frac{0.900atm*0.0314L}{0.08206\frac{atm*L}{mol*K}*296.85K} \\\\n=0.00116mol[/tex]

Final step is to compute the mass by knowing that gaseous nitrogen has a molar mass of 28.02 g/mol:

[tex]m=0.00116mol*\frac{28.02g}{1mol} \\\\m=0.0325g[/tex]

Regards!

The mass of nitrogen gas that was collected is 0.0336 grams.

Given the following data:

Scientific data:

To determine the mass of nitrogen gas that was collected:

First of all, we would calculate the number of moles of nitrogen gas used by using the ideal gas law equation:

[tex]n = \frac{PV}{RT}[/tex]

Where;

Substituting the given parameters into the formula, we have;

[tex]n = \frac{0.93 \times 0.0314}{0.0821 \times 296.7}\\\\n=\frac{0.0292}{24.36}[/tex]

n = 0.001199 moles

For the mass of nitrogen gas:

[tex]Mass = n \times molar \;mass\\\\Mass = 0.001199 \times 28.02[/tex]

Mass = 0.0336 grams

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Answer:

D. In both, vibrations occur in a parallel direction to the direction of the wave.

Explanation:

It is not true that in both mechanical and electromagnetic waves, vibrations occur in  parallel direction to the direction of the wave.

As with all waves, they are disturbances that transfers energy without moving the materials of the medium.

Answer:

The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth. Carbon is the main component of biological compounds as well as a major component of many minerals such as limestone

Answer:

The independent variable is the variable that is deliberately changed by the scientist. The dependent variable is the one observed during the experiment. The dependent variable is the data we collect during the experiment.

Answer:

answer is

Explanation:

Gallium because it has the properties which you have mentioned

The element of Group 13 would most likely have a physical and chemical properties of brittle, shiny, semiconductor, and is silver is gallium. The correct option is B.

Gallium is a chemical substance with the atomic number 31 and indeed the emblem Ga.

Gallium belongs to periodic table group 13 and is chemically similar to the other metals in the group. In standard temperature and pressure, gallium is a soft, silvery metal.

It finds widespread application in Blu-ray technology, mobile phones, blue and green LEDs, and pressure sensors for touch switches. Gallium readily alloys with the majority of metals.

It is especially useful in low-melting alloys. Because of its high boiling point, it is ideal for recording temperatures that would vaporize a thermometer.

Gallium is a rare element on Earth, but its abundance is comparable to that of lithium and lead, with a content of 19 ppm in the continental crust.

Thus, the correct option is B.

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Answer:

As the thermal energy of matter increases, its particles usually spread out, causing the substance to expand.

Explanation:

i have a book about this stuff

As the thermal energy of matter increases, its particles usually spread out,

causing the substance to expand.

Thermal energy is the energy which is measured as a result of its heat

content. This is usually as a result of the increase in temperature of the

substance involved.

Increase in temperature leads to an increase in thermal energy. This leads

to the particles spreading out and the substance expanding as a result of

the atoms being loosely held together.

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Answer:

water vapor

Explanation:

the the answer is water vapor

Answer:

C. How the substance behaves in the presence of an acid.

Explanation:

Have a great day

Chemical properties can be defined as the ones that describe a substance's ability to undergo chemical changes.

Physical properties can be defined as the ones that are measured and observed without actually changing the substance's identity.

Among the given options, the color, the hardness, and the behavior of a substance in the presence of a magnet are all examples of physical properties.

However, the behavior of a substance in the presence of an acid is an example of chemical property.

Hence, the correct answer is option c.

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Answer:

15 grams of water

Explanation:

15 grams of water of water would lose heat the faster compared to higher masses of water.

Water generally is a poor conductor heat.

Answer:

Csl

Explanation:

Caesium iodide or cesium iodide is the ionic compound of caesium and iodine. It is often used as the input phosphor of an X-ray image intensifier tube found in fluoroscopy equipment. Caesium iodide photocathodes are highly efficient at extreme ultraviolet wavelengths.

- Wikipedia

Answer:

The correct answer is 0.61.

Explanation:

Based on the given information, a transferrin solution was titrated with a standard ferric solution. The blank absorbance was 0.04 and the absorbance of 10 ml solution of transferrin post supplementation of 6 ml titrant came out to be 0.65. The corrected optical density or absorbance can be determined by using the formula,

Corrected OD = Measured OD - Blank or Reference OD

Now putting the values we get,

Corrected OD = 0.65 - 0.04

Corrected OD = 0.61

Answer:

The first option is the correct option

Explanation:

Copper is one of the transition elements which are normally found in the d-block. Generally, transition elements that have low oxidation number/charge usually undergo ionic/electrovalent bonding, while those that have a relatively higher oxidation number/charge usually undergo covalent bonding. Copper has charges ranging from 1+, 2+ or 3+ and thus will normally undergo ionic bonding which involves the gain or loss of electrons to meet the octet rule.

The best description of how atoms bond in a copper sample is; the atoms share electrons in order to achieve a stable octet - a type of bonding called Metallic bonding.

According to the question;

Definition:

A metallic bond is pretty different from covalent and ionic bonds, but the objective of the bonding is the same: to achieve a lower energy state.

Contrary to a bond between just two atoms, a metallic bond is a sharing of electrons between many atoms of a metal element.

P.S: Copper is one of the transition metals with variable oxidation states.

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Answer:

5.29kg

Explanation:

5.29kg

The mass of 4.87×10²⁵ atoms of Zn is 5.29 Kg

From Avogadro's hypothesis,

Recall,

1 mole of Zn = 65.38 g

Converting 65.38 g to Kilogram (Kg), we have:

1000 g = 1 Kg

Therefore,

65.38 g = 65.38 / 1000

Thus, we can say that,

Finally, we shall determine the mass of Zn that contains 4.87×10²⁵ atoms. This can be obtained as follow:

6.02×10²³ atoms = 0.06538 Kg of Zn

4.87×10²⁵ atoms = [tex]\frac{4.87*10^{25} * 0.06538}{6.02*10^{23} } \\\\[/tex]

Therefore, the mass of 4.87×10²⁵ atoms of Zn is 5.29 Kg

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Answer:

that is an invalid question

The word equation for this reaction is:

Sodium carbonate + Sulfuric acid → Sodium sulfate + Carbon dioxide + Water.

The given chemical equation represents a chemical reaction between sodium carbonate (Na₂CO₃) and sulfuric acid (H₂SO₄). When these two substances react, they undergo a chemical change and produce different compounds. The reaction results in the formation of sodium sulfate (Na₂SO₄), carbon dioxide (CO₂), and water (H₂O).

In a word equation, the chemical reaction is described using the names of the substances involved rather than their chemical formulas. Hence, the word equation for this reaction would be:

Sodium carbonate + Sulfuric acid → Sodium sulfate + Carbon dioxide + Water.

This word equation provides a simple and concise description of the reactants and products involved in the chemical reaction, allowing for a better understanding of the overall transformation of substances that occurs during the reaction.

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Answer:

d

Explanation: