What volume would be occupied by 9.95 g of a substance with a density of 1.71g/cm32
5.82 cm3
9.95 cm3
17.02 cm
.221 cm 3

Answer:

FeCl3 + 3KOH → Fe(OH)3 + 3KCl

Explanation:

Answer:D

Explanation:I did it on study island.

Radio waves are not used to generate medical images because as per the electromagnetic spectrum ,the radio waves  carry little energy that they pass through most atoms without interaction.

The electromagnetic spectrum consists of  radiation  which consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

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Explanation:

Crude oil distillation is a complex and capital-intensive process in petroleum refining. The crude oil distillation unit comprises distillation columns, pump-around loops, side strip.pers and a heat recovery system, known as the preheat train.

Answer:

c

Explanation:

The ozone layer is present in the stratosphere layer of the Earth's atmosphere. Therefore, option (C) is correct.

An atmosphere can be defined as layers of gases that envelop a planet and is held in place due to the gravity of the planetary body. A planet contains an atmosphere when the gravity is great and the temperature of the atmosphere of any planet is low.

Earth's atmosphere is made of Nitrogen (78 %), Oxygen (21%), Argon (0.9%), and Carbon dioxide (0.04 %).  The troposphere can be defined as the lowest layer of the atmosphere. The troposphere contains 75 to 80 % of the mass of the atmosphere.

The stratosphere contains the ozone layer, at an altitude between 15km and 35km. This atmospheric layer absorbs most of the UV radiation that Earth receives from the Sun.

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The first half-reaction is the oxidation of Cr2O7^2– to Cr^3+ and the second half-reaction is the reduction of I^– to IO3^–. When combined, the overall reaction is Cr2O7^2– + I^– → Cr^3+ + IO3^–.

The electrolytic cell consists of two electrodes, one anode and one cathode, both of which are immersed in an electrolyte solution. At the anode, the Cr2O7^2– ions are oxidized to Cr^3+ ions, releasing electrons into the external circuit.

At the cathode, the I^– ions are reduced to IO3^– ions, and the electrons from the external circuit are used to drive the reaction. The electrolyte solution must contain both Cr2O7^2– and I^– ions in order to facilitate the transfer of electrons between the electrodes.

The overall reaction is driven by the potential difference between the anode and the cathode, which is created by the flow of electrons through the external circuit.

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Answer:

\(M=0.638M\)

Explanation:

Hello!

In this case, since the molarity of a solution is calculated by diving the moles of solute by the volume of solution in liters, we first compute the moles of barium hydroxide in 35.5 g as shown below:

\(n=35.5g Ba(OH)_2*\frac{1molBa(OH)_2}{171.34gBa(OH)_2}\\\\n=0.207mol\)

Then, the liters of solution:

\(V=325mL*\frac{1L}{1000mL} =0.325L\)

Finally, the molarity turns out:

\(M=\frac{0.207mol}{0.325L}\\\\M=0.638M\)

Best regards!

In keeping with the general trends, K-Br will have the smallest bond energy. The bond energy refers to the energy that keeps the atoms in a bond together.

Bond energy is the energy that is required to hold atoms together in a bond. This energy must also be supplied when the atoms are to be separated.

We have the bond energies of each of the bons in the question, we have to note that the the smallest value of bond energy is Na-Br hence in keeping with the general trends, K-Br will have the smallest bond energy.

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Answer:

Chemistry B Semester Exam 5/4/2023

1. Cs-Br

2. K-C is ionic, and C-O is polar covalent

3. All molecules are in constant motion, so they all have some kinetic energy.

4. The reaction between substances A and B has a lower activation energy than the reaction between substances B and C.

5. More bond energy is absorbed on the reactants side than is released on the products side.

6. an exothermic reaction

7. Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.

8. Heat must be released by the products in order to convert from the reactants.

9. Cooling a purple solution will turn it pink.

10.  Both are flexible, but one conducts electricity while the other insulates.

11. high pressure, high-temperature water extraction

12. steel + vanadium for shock absorption

13. 15

14. the number of atoms, type of elements, and mass of reactants and products are equal.

15. 64 grams

16. 1.503x10^23

17. The relative numbers of protons and neutrons can differ before and after the change, but the total number of those particles remains the same.

18. The plastic balls are a good representation of neutrons, but there is no splitting of nuclei as happens in fission.

19. beta minus decay

20. alpha decay

21. Greenhouse gases have more than two atoms, allowing them to vibrate and release radiation, warming the atmosphere.

22. cause: acid rain, consequence: destruction of crops

23. toxic bacteria in the water supply

24. it reaches hard to get to oil and gas deposits.

Answer:

Explanation:

When volume of gas is V , pressure is P and temperature is T , if n be number of moles of gas

PV / RT = n , R is universal gas constant .

When volume becomes .5 V , pressure P and temperature T

number of moles = Px .5 V / RT = .5 PV / RT = .5 n

Number of moles of gas becomes half .

so 4 moles becomes  2 moles

No of moles lost = 4 - 2 = 2 moles.

Answer:

Waning Crescent

Explanation:

Hope iT Help

Brainliest please

Answer:

It’s b;)

Explanation:

Answer:

B is correct

Explanation:

Answer:

The median is the middle number in a sorted collection of numbers. The mean is the average number in a collection of numbers. The mode is the most frequent number in a collection of numbers.

Explanation:

Median, mean, and mode are all math concepts pertaining to data sets. Hope this helped :)

The percent yield of CO₂ In the reaction CH₄ + 2O₂ → 2H₂O + CO₂ if 1600g of methane reacts with excess oxygen to produce 2200 is 67.5%.

To calculate the percent yield of CO₂ in the given reaction, we need to first calculate the theoretical yield of CO₂. This can be done by stoichiometric calculations using the balanced chemical equation:

CH₄ + 2O₂ → 2H₂O + CO₂

The molar mass of CH₄ is 16.04 g/mol. Therefore, 1600 g of CH₄ is equivalent to 100 moles of CH₄. According to the stoichiometry of the reaction, 1 mole of CH₄ produces 1 mole of CO₂. Therefore, the theoretical yield of CO₂ is also 100 moles.

The molar mass of CO₂ is 44.01 g/mol. Therefore, the theoretical yield of CO₂ in grams is 4401 g.

The actual yield of CO₂ given in the problem is 2200 g.

Therefore, the percent yield of CO₂ is:

Percent yield = (actual yield / theoretical yield) x 100%

Percent yield = (2200 g / 4401 g) x 100%

Percent yield = 0.499 x 100%

Percent yield = 49.9%.

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472.7ml of a .5500 M solution of NaI are needed to produce 34.81mg of I\(_2\) in the reaction COCl\(_2\)+2NaI  → 2NaCl+CO+I\(_2\).

A measurement of three-dimensional space is volume. Several imperial or US customary units, as well as SI-derived units (such the cubic meter and liter), are frequently used to quantify it quantitatively. Volume and length (cubed) have a symbiotic relationship.

COCl\(_2\)+2NaI  → 2NaCl+CO+I\(_2\)

number of moles of I\(_2\) =34.81/254=0.13moles

2 moles of NaI gives 1 moles of I\(_2\)

0.13moles are obtained by 2×0.13=0.26moles of NaI

0.550moles of I\(_2\) is present in 1000ml

0.26moles of I\(_2\) is present in (1000/0.55)×0.26=472.7ml

Therefore, 472.7ml of a .5500 M solution of NaI are needed to produce 34.81mg of I\(_2\).

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Answer:

don't get the question2

Answer:

Catalysts help in increasing rates of reactions

Answer:

тємρєяαтυяє

Explanation:

Temperature. Usually reactions speed up with increasing temperature.

Political parties are most inclined to match polling responses to identifiable individuals in voter files to determine patterns in national general election campaigns today.

Political parties are essential institutions of democracy. By competing in elections parties offer citizens a choice in governance, and while in opposition they can hold governments accountable. When citizens join political parties, volunteer their time, donate money and vote for their leaders, they are exercising their basic democratic rights.

In an election campaign winning is everything, there is no consolation for being a runner-up. With the increasing penetration of television and the internet, voters today are more informed, independent, and discerning in casting their votes.

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Answer:

The answer is "\(1.25 \times 10^{-3} \ \frac{m}{s}\)"

Explanation:

Calculating the rate of the equation:

\(=-\frac{1}{2} \frac{\Delta [SO_2]}{\Delta t} =-\frac{\Delta [O_2]}{\Delta t}= +\frac{1}{2} \frac{\Delta [SO_3]}{\Delta t}\\\\=\frac{\Delta [SO_2]}{\Delta t}=\frac{0.0500-0.175\ M}{505}= -2.5 \times 10^{-3} \ \frac{m}{s}\\\\\)

Rate:

\(=\frac{-2.5 \times 10^{-3}}{2}=1.25 \times 10^{-3} \ \frac{m}{s}\)

B. An electron EMITS a photon as it goes from a HIGHER TO LOWER energy level.

When an electron in an atom drops from a higher energy level to a lower energy level, it releases energy in the form of a photon.

What is Spectrum?

In science, the term "spectrum" is often used to describe the range of colors of visible light, known as the "visible spectrum," which includes all the colors of the rainbow. This spectrum is produced when white light is dispersed into its component colors by a prism or other means.

This energy is specific to the atom and its electron configuration, which is why each atom emits a unique set of wavelengths, creating a distinct emission spectrum.

Since the emission spectrum in the question has a line in the blue region, it means that the energy released by the electron corresponds to a specific frequency or wavelength in the blue region of the visible spectrum.

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Answer:

a

Explanation:

it is an electrolyte because of its strong polar chemical bond

Answer:

Geology

Explanation:

Geology is not a branch of biology.

Biology is the study of all forms of lives. Bio - life and logy - study

It consists of studies of plants, animals and micro-organisms. Some of its sub-branches are zoology, botany, genetics, micro-biology e.t.c.

Answer:

geology

Explanation: I took the test.

Answer:

0.674 moles HNO₃

Explanation:

To find the moles of HNO₃, you need to (1) convert grams NO₂ to moles NO₂ (via molar mass) and then (2) convert moles NO₂ to moles HNO₃ (via mole-to-mole ratio from equation coefficients). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value (46.5 g).

Molar Mass (NO₂): 14.007 g/mol + 2(15.998 g/mol)

Molar Mass (NO₂): 46.003 g/mol

3 NO₂(g) + H₂O (l) ------> 2 HNO₃(g) + NO(g)

46.5 g NO₂            1 mole                2 moles HNO₃
-------------------  x  -------------------  x  --------------------------  =  0.674 moles HNO₃
                              46.003 g             3 moles NO₂

Answer:

Synthesis

Explanation:

A sysnthesis reaction takes two or more reactants to create one product

Answer:

C - commas indicate a natural pause in the sentence

Increasing the pressure of a gas system increases the rate of reaction because it leads to an increase in the number of collisions between gas molecules. option D. It increases the rate of reaction because it increases the number of collisions.

Increasing the pressure of a gas system increases the rate of reaction because it leads to an increase in the number of collisions between gas molecules. As pressure increases, the gas molecules are compressed into a smaller volume, resulting in a higher concentration of molecules per unit volume. This higher concentration means that there are more gas molecules in a given space, leading to a greater frequency of collisions. According to the collision theory, for a reaction to occur, molecules must collide with sufficient energy and the correct orientation. By increasing the pressure, the molecules are brought closer together, increasing the likelihood of effective collisions. This, in turn, increases the rate of reaction. Therefore, increasing the pressure of a gas system increases the rate of reaction by increasing the number of collisions between gas molecules. Option D) is correct

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Based on the law of conservation of mass, the apparent loss in mass of the product is due to the gas evolved.

The law of the conservation of mass states that matter cannot be created or destroyed but can be transformed from one form to another.

The law of conservation of mass is applied in chemical reaction.

Based on the law of conservation of mass, the sum of the masses of the reactants is equal to the sum of the masses of the products in a chemical reaction.

Considering the give reaction:

A student combines 5.0 g of Reactant A with 5.0 g of Reactant B in a flask.

Sum of masses of reactants = 10.0 g

Mass of reactant as shown on the balance after the reaction = 9.3 g

Since the reaction produced a gas, the apparent loss in mass of the product is due to the gas evolved.

Hence, the balance is not broken.

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The molarity of the NiSO₄ solution made by dissolving 38.81 grams of nickel (ii) sulfate, NiSO₄, in enough water to make 0.467 liters of solution is 0.535 M

First, we shall obtain the mole of 38.81 grams of nickel (ii) sulfate, NiSO₄. Details below:

Mole of NiSO₄ = mass / molar mass

= 38.81 / 154.75

= 0.25 mole

Now, we shall determine the molarity of the solution. Details below:

Molarity of solution = mole / volume

= 0.25 / 0.467

= 0.535 M

Thus, the molarity of the solution is 0.535 M

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