A chemical reaction takes place in which energy is absorbed arrange the characteristics of the reaction in order from start to finish

Answer: D: 3.86

Explanation:

Answer:

Cosmic background radiation is leftover thermal energy from the big bang.

Explanation:

The answer to your question

B

I hope the answer to your question

Answer:

D. Temperature

Explanation:

This is the correct answer on edge.

The final balanced equation is 3Cu(s) + 2HNO₃(aq) + 6H⁺(aq) → 3Cu²⁺(aq) + 2NO(g) + 4H₂O(l).

To balance the redox reaction of copper with nitric acid in acidic conditions, we need to write separate half-reactions for oxidation and reduction, balance them for mass and charge, and then combine them into a balanced overall equation. The oxidation half-reaction involves copper turning into copper(II) ions:

oxidation:
Cu(s) → Cu²⁺ (aq) + 2e⁻

For the reduction half-reaction, nitric acid is reduced to nitrogen monoxide:

reduction:
HNO₃(aq) + 3e⁻ → NO(g) + H₂O(l)

Now we multiply each half-reaction by a number that will balance the electrons lost in oxidation with the electrons gained in reduction. For this equation, we multiply the oxidation half-reaction by 3 and the reduction half-reaction by 2:

3Cu(s) - 3Cu²⁺ (aq) + 6e⁻
2HNO₃(aq) + 6e⁻ - 2NO(g) + 2H₂O(l)

Now we combine the half-reactions and add 6H⁺ to balance the hydrogen:

3Cu(s) + 2HNO₃(aq) + 6H⁺ (aq)
ightarrow 3Cu²⁺ (aq) + 2NO(g) + 4H₂O(l)

This equation represents the balanced redox reaction in acidic solution between solid copper and nitric acid to produce aqueous copper(II) ions and nitrogen monoxide gas.

The complete question is:

Balance the following equation in acidic conditions. Phases are optional.

Cu+NO3- = Cu2+ NO

(redox and Oxidation reactions)

The helium flash, a nearly explosive ignition in a red giant star's core, converts helium into carbon through the triple-alpha process. This marks a crucial step in stellar evolution involving the production of heavier elements. Recognized by two protons in its nucleus, helium exists as the second most abundant element in the universe.

The helium flash refers to a nearly explosive ignition of helium as a part of the triple-alpha process in the dense core of a red giant star. During the helium flash, helium (a lighter element) is converted into a heavier element, specifically, carbon. Managed through a sequence called the triple-alpha process, three helium-4 nuclei combine to form a carbon-12 nucleus.

The process of forming helium from hydrogen involves addition of another proton to create the helium nucleus, emitting significant energy. As a part of stellar evolution, the complete exhaustion of helium in the core leads to the production of heavier elements like oxygen, neon, and magnesium, by the fusion of carbon.

For context, helium is the second-most abundant element in the universe, discovered in 1868, and is defined by its two protons within the nucleus. This element is most commonly known as the light gas used to inflate balloons.

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One mole of copper(II) sulfate, CuSO4, contains 6.022 x 10^23 atoms.

One mole of copper(II) sulfate, CuSO4, contains 6.022 x 1023 atoms. This can be determined using Avogadro's number, which states that one mole of any substance contains 6.022 x 1023 atoms or molecules. Therefore, in one mole of copper(II) sulfate, there would be 6.022 x 1023 copper atoms, 6.022 x 1023 sulfur atoms, and 24.088 x 1023 oxygen atoms.

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One mole of copper(II) sulfate contains four moles of oxygen atoms. Using Avogadro's number, it translates to approximately 2.4088 x 10^24 oxygen atoms.

The question asks for the number of oxygen atoms present in one mole of copper(II) sulfate (CuSO4). Copper sulfate contains one copper atom (Cu), one sulfur atom (S), and four oxygen atoms (O). Hence, one mole of copper(II) sulfate would contain four moles of oxygen atoms.

Using Avogadro's number, which states there are 6.022 x 10^23 entities (such as atoms) in one mole, we can say that one mole of copper(II) sulfate contains 4 times 6.022 x 10^23 oxygen atoms, which is approximately 2.4088 x 10^24 oxygen atoms.

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Answer:

The element will be represented as : [tex]Ba_{56}^{130}[/tex]

Explanation:

The identity of an element (isotope) is with its atomic number.

The atomic number is the number of protons in the element.

Irrespective of the number of electrons / neutrons the atomic number will be equal to the number of protons only.

atomic number of the isotope is 56.

The element with 56 atomic number is Barium

The mass number of Barium = protons + neutrons = 56 + 74 = 130

The element will be represented as : [tex]Ba_{56}^{130}[/tex]

Answer:

Legal laws are passed by lawmakers in a democratic process that accounts for people's opinions and beliefs.

Scientific laws are discovered and tested by experiments.

Legal laws can be changed if people change their minds.

Legal laws may have exceptions.

on edg

Explanation:

The pH of the mixture solution is 0.745

The concentration of [tex]HNO_3[/tex] = 0.18 m

The concentration of [tex]HBrO[/tex] = 0.24 m

It is required to calculate the pH of the mixture solution.

pH, a quantitative measure of the acidity or basicity of aqueous or other liquid solutions.

We know that [tex]HNO_3[/tex] is a strong acid while HBrO is weak acid.

Therefore we ignore the presence of the weak acid such that we consider the pH of the strong acid.

since

pH= - log (H⁺)

Hence pH= -log (0.18)

             pH  = 0.745

Therefore, the pH of the mixture solution is 0.745

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The partial pressure of O₂ is 0.693 atm, the partial pressure of He is 5.55 atm, and the total pressure in the vessel is 6.24 atm.

The partial pressure of each gas and the total pressure in the vessel, we can use the ideal gas law, PV = nRT. We'll start by calculating the number of moles of each gas.

Now use the ideal gas law to find the partial pressures. The universal gas constant (R) is 0.0821 L·atm/(mol·K) and the temperature (T) is 65 °C, which is 338 K.

Total Pressure = P(O₂) + P(He) = 0.693 atm + 5.55 atm = 6.24 atm

Answer:

Electrons in the outermost shell are called valence electrons, because it is their interactions that determine the chemical properties of an element. The columns that were set up to group elements by similar chemical properties turn out to be the exact same columns defined by the number of valence electrons.

The valence electron of an element determines the group of the element and elements in the same group have similar chemical properties.

The valence electron of an element indicates its the group of the element in the periodic table. Elements found within the same group in the periodic table have similar chemical properties.

For example:

Thus, we can conclude that valence electron of an element determines the group of the element and elements in the same group have similar chemical properties.

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The reaction of 0.20 moles of oxygen on complete utilization produces 0.40 moles of MgO.

From the reaction,

1 mole of oxygen produced 2 moles of MgO.

So, 0.20 moles of oxygen produces:

Moles of MgO produced = 0.20 [tex]\times[/tex] 2

Moles of MgO produced = 0.40 moles.

The reaction of 0.20 moles of oxygen on complete utilization produces 0.40 moles of MgO.

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Answer:

1. Largest planet in the solar system.

2. Has no moons.

3. True

4. Most of them lie in a belt between Earth and Mars.

5. Earth

6. The orbital period of planet A is shorter than that of Planet B.

Explanation:

1. Saturn is the second largest planet of the solar system. It is a gaseous planet which is known as the Ringed planet because of the beautiful ring system which are visible from Earth through telescope. It has several moons - more than 60 moons.

2. Mars is known as red planet. It is the fourth planet from the sun. It is one of the rocky planets having very thin atmosphere. It has two moons - Phobos and Deimos.

3. From Kepler's first law of planetary motion we know that planets move around Sun in an elliptical orbit with sun at its foci. Thus, the given statement is true.

4. Asteroids are irregular shaped and sized rocky objects orbiting sun . These are thought to be remains of  a never formed planet between Mars and Jupiter. Thus, majority of the asteroids are found between the orbits of these two planets.

5. There are four terrestrial planets ( Mercury, Venus, Earth and Mars). The terrestrial planets have the following layers- the core, the mantle and the crust. Out of these four planets- the Earth has the smallest inner core.

6.  From Kepler's laws about planetary motion, we know that the planet closer to the Star moves with greater orbital speed and thus has shorter orbital period than the rest. Here, planet A is closer to the star than planet B. Thus, planet A would have shorter orbital period than planet B.

This detailed answer provides accurate explanations for each question, covering topics related to the description of Saturn, Mars, elliptical orbits, asteroids, planet cores, and orbital motion.

1- The statement 'Largest planet in the solar system' is not a description of Saturn. Saturn is actually the second-largest planet in our solar system, with Jupiter being the largest.

2- The statement 'Has no moons' is not a description of Mars. Mars actually has two moons, named Phobos and Deimos.

3- The statement is true. Planets do move around the sun in elliptical orbits. An elliptical orbit is a slightly elongated circle, and this is the shape followed by the planets in our solar system.

4- The statement 'They are thought to be remains that never formed a planet' is not a description of asteroids. Asteroids are actually rocky fragments that orbit the sun but are too small to be considered planets. Some asteroids may be remnants from the early formation of the solar system, but not all of them.

5- According to the chart, Venus has the smallest inner core. The chart shows that Venus has the smallest inner core compared to Mars, Jupiter, and Earth.

6- The description that explains the expected motion of Planets A and B is that the orbital period of Planet B is shorter than that of Planet A. When a planet is closer to the star, its orbital period is shorter, which means it completes its orbit more quickly than a planet that is farther away.

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Answer is: nitrogen(N₂), oxygen(O₂), hydrogen(H₂), carbon monoxide(CO), calcium oxide(CaO), hydrogen chloride(HCl), sodium hydride(NaH).

Diatomic molecules are molecules made of two atoms.

They can be homonuclear (molecule made of two atoms of the same element) and heteronuclear (molecule made of two different atoms).

Answer:

Option (I) has the lowest energy rate so that would be best option.

Explanation:

(I). Given that,

Input energy = 1900 W

Output energy = 1786 W

We calculate the loss of energy

Using formula of loss of energy

[tex]E_{loss}= E_{in} - E_{out}[/tex]

Put the value into the formula

[tex]E_{loss}=1900-1786= 114\ W[/tex]

(II). Given that,

Input energy = 1450 W

Output energy = 1300 W

We calculate the loss of energy

[tex]E_{loss}=1450-1300= 150\ W[/tex]

(III). Given that,

Input energy = 1950 W

Output energy = 1833 W

We calculate the loss of energy

[tex]E_{loss}=1950-1833= 117\ W[/tex]

(IV). Given that,

Input energy = 2000 W

Output energy = 1822 W

We calculate the loss of energy

[tex]E_{loss}=2000-1822= 178\ W[/tex]

Hence, Option (I) has the lowest energy rate so that would be best option.

The solute that is found in the greatest amount in ocean water is salt.

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In an exothermic reaction, the energy of the reactants is higher than that of the products, signifying that energy is released. The activation energy is the difference between the energy of the reactants and the activated complex, and the enthalpy of reaction is the heat content change indicating if the reaction is exothermic or endothermic.

To determine whether a reaction is exothermic or endothermic, we can analyze the enthalpy change (ΔH). If ΔH is less than zero (ΔH < 0), this indicates that the reaction is exothermic. In an exothermic reaction, the energy of the reactants is higher than that of the products, and energy is released in the form of heat or light.

To calculate the activation energy (A), which is the minimum energy required to start a reaction, we consider the energy difference between the reactants (E) and the activated complex (B), also known as the transition state.

The enthalpy of reaction (C) represents the heat content change from reactants to products. In cases where the products (G) have lower energy than the reactants (F), the reaction is indeed exothermic. Therefore, in your answer, you should include ideas that reflect the concepts of activation energy, activated complex, enthalpy of reaction, energy of the reactants, and energy of the products to explain why the reaction is exothermic.