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Answer:

Explanation:

option C is correct

Answer:

The moon is covered in Earth’s shadow.

Explanation:

When the moon goes behind the earth to the shadow it becomes a solar eclipse.

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Answer:

C. They change the substance into another substance.

Explanation:

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Answer:Is sugar water a mixture or a compound? Define mixtures and compounds, and explain how without tasting it, Nicole can test to make sure she is using the sugar water in the glaze. The sugar-water is a mixture because it is chemically bonded, not chemically combined. A mixture is something that has 2 substances or more. hope this helps

Explanation:

when the temperature is raised to 325 K and the volume is increased to 1.8 L, the gas will occupy a pressure of approximately 1.08 atm.

To solve this problem, we can use the combined gas law equation, which relates the initial and final conditions of a gas when the amount of gas remains constant.

The combined gas law equation is given as:

(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂

where P₁, V₁, and T₁ represent the initial pressure, volume, and temperature, respectively, and P₂, V₂, and T₂ represent the final pressure, volume, and temperature, respectively.

Given

Initial pressure (P₁) = 1.2 atm

Initial volume (V₁) = 0.9 L

Initial temperature (T₁) = 273 K

Final volume (V₂) = 1.8 L

Final temperature (T₂) = 325 K

We need to find the final pressure (P₂).

Substituting the given values into the combined gas law equation, we have:

(1.2 atm * 0.9 L) / 273 K = (P₂ * 1.8 L) / 325 K

Now, we can solve for P₂:

P₂ = (1.2 atm * 0.9 L * 325 K) / (273 K * 1.8 L)

= 1.08 atm

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Answer:

2.040 mol CO

Explanation:

First, write out your reaction:

CO + O2 --> CO2

Balance the reaction:

2CO + O2 --> 2CO2

Now divide the 32.65 g O2 by the molar mass of O2 (32.00 g/mol) to get moles of O2. Then multiply by the mole ratio of 2 mol CO for every 1 mol O2 to get moles of CO needed to fully react.

32.65 g O2 / 32.00 g/mol = 1.020 mol O2

1.020 mol O2 • 2 mol CO / 1 mol O2 = 2.040 mol CO

Answer:

The answer is option B.

Reduction

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Answer:

plato answer b

Explanation:

If both electron affinity and heat of sublimation are smaller, then MX would be less stable.

M²⁺ + X⁻(g) → MX(s), + Lattice energy

Therefore, from the given thermodynamic cycle,

Lattice enthalpy = -100-800 = -900kJ/mol

Lattice enthalpy MX = -900kJ/mol

Enthalpy of the formation of MX is given as follows:

M(s) + 1/2X₂(g) --------->M(g) + 1/2 X₂(g)

Enthalpy of formation = +250 kJ

M(g) + 1/2X₂(g)  → M(g) +X(g)

Enthalpy of formation = +350 kJ

M (g) + X(g) ------> M²⁺(g), + X(g)

Enthalpy of formation = +400 kJ

M²⁺ (g) + X(g) 24→ M²⁺(g), + X(g)

Enthalpy of formation = +200kJ

M²⁺(g), + X⁻(g)→ MX(s)

Enthalpy of formation= +900kJ.

Enthalpy of formation of MX = 250 +350 +406-200-900 = -100 kJ

Therefore, Enthalpy of formation of MX = -100 kJ

Since electron affinities are the heat released while the heat of sublimation is the heat absorbed then if electron affinity decreases while the heat of sublimation, increases then the overall enthalpy of formation of MX will be less negative. Hence in that case MX would be less stable.

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The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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The Darwin's theory of natural selection is responsible for the Galapagos birds to have various beak shapes. The evolution is a very slow and gradual process.

According to Darwin's theory of natural selection, species keep on evolving or changing with time. During the change of environment the requirements of an organism also change and they adapt to the new environment.

This process of changing over a period of time as per the natural requirements is called the adaptation. Darwin identified that these sparrow like birds came to the Galapagos island by wind.

The finches evolved from a common ancestor to have different beaks which is well suited for different types of food they feed on.

Thus Galapagos birds are example for adaptive radiation.

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The mass of a Pb-208 atom should be 209.73 u.

Number of Protons (P) = 82

Number of Electrons (E) = 82

Number of Neutrons (N) = 126

Mass of a proton (mp) = 1.0073 u

Mass of an electron (me) = 0.00055 u

Mass of a neutron (mn) = 1.0087 u

We know that, Mass number = Protons + Neutrons

Mass number of Pb = 82 + 126 = 208

The mass of an atom = sum of the masses of the protons, neutrons and electrons present in it

The total mass of the protons = Mass of proton x Number of Protons = mp x P = 1.0073 u x 82 = 82.5986 u

The total mass of the electrons = Mass of electron x Number of Electrons = me x E = 0.00055 x 82 = 0.0451 u

The total mass of the neutrons = Mass of neutron x Number of Neutrons = mn x N = 1.0087 u x 126 = 127.0962 u

The mass of a Pb-208 atom should be the sum of the total mass of protons, neutrons, and electrons that are present in it.

Mass of Pb-208 atom = Total mass of the protons + total mass of electrons + total mass of the neutrons

                                    =  82.5986 u + 0.0451 u + 127.0962 u= 209.73 u

Therefore, the mass of a Pb-208 atom should be 209.73 u.

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Explanation:

The "Roman numeral notation" uses symbols to indicate how large the positive charge of the metal ion is.

In particular:

A charge of 1+ is labeled with a capital (I),

2+ is labeled with a capital (II),

3+ is labeled with a capital (III),

4+ is (IV)

5+ is (V)

6+ is (VI)

7+ is (VII)

So, in our question, we have Cu^1+. The element symbol "Cu" is copper, and we have a 1+ charge. The Roman numeral notation is: Copper (I)

For the second part, we have CoCl2. The metal here is Co. The element symbol "Co" is cobalt. What is the charge? We should know that Cl has a negative charge of 1-, so since we have two Cl atoms, the overall negative charge is 2-. Since the substance is neutral, this means that the cobalt atom must have a positive charge of 2+ to balance. So, the Roman numeral notation is: Cobalt (II)

The description of the molecules shown is it is unsaturated alkynes. The correct option is A.

Alkynes are unsaturated double bond containing compound that react with hydrogen when a catalyst is present.

The pie bond shows that the hydrogen atoms are lost from the alkanes.

Thus, the correct option is A, unsaturated alkynes.

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Gas particles exert pressure on their container through their random and constant motion, colliding with the walls of the container.

Gas particles are in constant motion, moving in all directions with varying speeds. When these particles collide with the walls of their container, they exert a force on the walls. The cumulative effect of these collisions leads to the creation of pressure within the container. The more frequent and energetic the collisions, the higher the pressure exerted by the gas.

The pressure exerted by gas particles is a result of the collective impact of their collisions with the container walls. This pressure is directly related to the temperature, volume, and number of gas particles present. Understanding the behavior of gas particles and their interactions with the container is crucial in various scientific and practical applications, such as in the study of thermodynamics, gas laws, and the design and operation of systems involving gases, such as engines and gas cylinders.

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Answer:

THE INITIAL VOLUME OF THE STOCK SOLUTION IS 0.0392 L OR 39.2 mL

Explanation:

To calculate the volume of a solution before dilution, we make use of the dilution formula;

C1 V1 = C2 V2

C1 = the concentration of the stock solution = 15 M

V 1 = the volume of stock solution = ?

C2 = concentartion of final solution = 2.35 M

V2 = volume of final solution = 250 mL = 250/ 1000 = 0.25 L

Rearranging the formula, we obtain;

V1 = C2V2 / C1

V 1 = 2.35 * 0.25 / 15

V1 = 0.5875 / 15

V1 = 0.0392 L

the initial volume of the stock solution is 0.0392 L or 39.2 mL

Wavelength of (nm) of photon emitted is 438nm

Wavelength is the distance between identical points means adjacent crest in the adjacent cycles of a waveform signal propagated in space or along a wire

Here in the given data is photon emitted when electron drop at 7th orbital means n = 7 and n = 1 for hydrogen atom and redberg constant is also given = 1.097×10⁷m⁻¹

we have to find wavelength = ?

Expression of wavelength of radiation is

1/λ = R (1/n₁² - 1/n₂²)

1/λ = 109677×(1/7²- 1/1²)

1/λ =  109677×48/49

λ = 438.69cm = 43869m

λ = 438nm

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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The equation that depicts a single replacement reaction would be: Zn(s) + 2HCl(aq)→ ZnCl2​​​(aq) ​​​​+ H2(g)

They are also known as single displacement reactions.

They are reactions in which one element takes the place of another in a compound. That is, one element replaces another in a compound.

Looking at all the reactions from A - D, one can see that the only reaction that exemplifies a single replacement reaction is D.

Here, Zn replaced H in HCl.

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Using NAD and NADH reaction for the oxidation of methanol CH₃OH to formaldehyde, in which NAD is the oxidizing agent and then alcohol oxidase was crystallized after purification by ammonium sulfate precipitation

Oxidation means a process in which a chemical substance changes because of the addition of oxygen

Methanol was oxidized to formaldehyde by an alcohol oxidase and the reaction are

CH₃OH+O₂ → HCOH + H₂O₂

And the cofactor found in two form of cell and NAD is an oxidizing agent and it accept the electron of other molecule and reduced and this reaction is also with H⁺ form NADH which can be used as the reducing agent to donate electron and this reaction gives alcohol oxidase was crystallized after purification by ammonium sulfate precipitation

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In a galvanic cell, the reaction proceeds towards the production of products.  ΔG starts < 0, becomes more negative

Option B is correct .

As the reaction proceeds, the Gibbs free energy (ΔG) reduces, and the following are true:  ΔG starts < 0, becomes more negative.

When the reaction in a galvanic cell proceeds towards the production of products, the Gibbs free energy starts with a negative value, and it becomes even more negative.

The Gibbs free energy (ΔG) is a measure of the available energy in a system that can be used to do work. It measures the difference between the free energy of the final state and the initial state.The Gibbs free energy change of a system is dependent on the enthalpy and entropy change. If the enthalpy change is negative (exothermic), and the entropy change is positive (disorderly), the Gibbs free energy change is negative, and the reaction is spontaneous.

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Answer:

It may blow your eardrums, or affect your hearing in other ways.

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The expected major product of the given reaction sequence is t-BuBr.

In the first step of the reaction sequence, t-BuOK (tert-butoxide potassium) and t-BuOH (tert-butanol) are involved. This combination typically results in the elimination of a proton (H⁺) from t-BuOH, generating the t-butoxide ion (t-BuO⁻). The t-BuO⁻ ion then acts as a strong base and abstracts a proton from t-BuBr, leading to the formation of t-BuBr as the major product.

Therefore, the expected major product of the reaction sequence is t-BuBr.

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Answer:

A. 2 sig figs

Explanation:

In the number 0.0034, the zeros are called leading zeros. The only function of leading zeros is to fix the decimal point. Leading zeros are not counted as significant figures.

The relationship between dipole moment and the distance between the charges is that they both are directly proportional to each other.

Define dipole moment?

A dipole moment occurs in all systems where charge separation occurs. Therefore, they can occur both ionic and covalently. The dipole moment is caused by the difference in electronegativity between two atoms of her that are chemically bonded.

Dipole Moment (µ) = Charge (Q) * distance of separation (r)

Why is it called a dipole moment?

Dipole moment is a measure of the separation of two opposite charges. The dipole moment is a vector quantity. The magnitude is equal to the charge multiplied by the distance between charges, and the direction is from negative charge to positive charge:

μ = q · r

where μ is the dipole moment, q is the magnitude of the separated charge, and r is the distance between the charges.

The relationship between dipole moment and the distance between the charges is that they both are directly proportional to each other.

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The force of gravity acting on a 10 kg object is 98 Newtons.

The force of gravity is the force of attraction between two objects that have mass. It is the weakest of the four fundamental forces in nature, but it is the most far-reaching in its effects.The force of gravity acting on an object is equal to its mass multiplied by the acceleration due to gravity.This can be calculated using the equation Fg = mg, where m is the object's mass, g is the acceleration brought on by gravity, and Fg is the force of gravity.

In this case, m = 10 kg and g = 9.8 m/s2.

substitute the values in formula Fg=mg

\(Fg = 10 kg * 9.8 m/s^2\\ Fg = 98 Newtons.\)

Therefore,The gravity force of 10kg object is 98Newtons.

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Answer:

I think d is wrong statement