if 2.559 g copper are reacted in excess nitric acid (hno3), what volume (l) of hydrogen gas will be formed?

Answer:

A) Boron

Explanation:

I put oxygen and it was wrong lol. So, it said it was Boron

Answer:

The pressure increases and the volume remains constant

Explanation:

The bond order of the carbon-carbon bond in ethylene (C₂H₄) increases when an additional electron is added to the molecule to form the C2H4 ion. This is because the extra electron is shared between the two carbon atoms, forming a triple bond, which increases the bond order from 2 to 3.

What is the effect on bond order?

When ethylene gains an additional electron to give the C₂H₄ ion, the bond order of the carbon-carbon bond will decrease. Alkene compounds are characterized by a double bond between two carbon atoms in their structure. The bond order of ethylene.

Ethylene's carbon-carbon bond is a double bond that includes a sigma bond and a pi bond. Sigma bonds are formed when two orbitals overlap, and pi bonds are formed when two p orbitals overlap.

The bond order of ethylene's carbon-carbon bond is two because it is a double bond. Bond order is defined as the number of bonding electron pairs shared between two atoms. The higher the bond order, the stronger the bond.

If an additional electron is added to ethylene, the bond order of the carbon-carbon bond will decrease because the additional electron will increase the repulsion between the carbon atoms, resulting in a weaker bond. Therefore, when the ethylene molecule gains an additional electron to give the C₂H₄ ion, the bond order of the carbon-carbon bond decreases.

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heat is transferred from your hand to the ice cube

Answer:

Heat is transferred from your hand to the ice cube.

Answer:

Kinetic energy is highest at point B and Lowest at point A

Explanation:

The kinetic energy is directly proportional to the square of velocity. Therefore, the kinetic energy will be maximum at the point where the velocity is maximum. An it will be lowest at the position where the speed is the lowest. The speed is maximum at point B, because its the mean position. Hence, K.E will be max at B. Also speed is lowest at the highest point so, Kinetic Energy will be lowest at point A.

Another method can be used as follows:

Since, there are two energies present here, namely kinetic energy and potential energy that are interchanging with each other. From law of conservation of energy the sum of kinetic energy and potential energy must be equal at each point. Potential energy is directly proportional to height of object. So, the potential energy will be maximum at point A due to maximum height and consequently Kinetic energy will be minimum at point A. Similarly, the potential energy will be minimum at point B due to minimum height and consequently Kinetic energy will be maximum at point B. Therefore,

Kinetic energy is highest at point B and Lowest at point A

Answer:

Answer is D.Blue.

Explanation:

The hottest stars tend to appear blue or blue-white, whereas the coolest stars are red.

I hope it's helpful!

Answer:

D.Blue

Explanation:

The volume of dry carbon dioxide is 55mL measured at 25 degrees Celsius and 785 mm hg, will result from the combustion of 2.50 g of pentane.

Carbon dioxide may be found in solid form as dry ice. Since CO2 does not have a liquid state at normal atmospheric pressure and instead sublimates directly from the solid state to the gas state, it is frequently used for short-term refrigeration. In addition to being utilised in fog machines in theatres for dramatic effects, it is largely employed as a cooling agent.

Its benefits include being colder than water ice and leaving no traces behind (apart from accidental frost from atmospheric moisture). It is helpful for keeping frozen items (like ice cream) from spoiling in situations when mechanical chilling is not possible.

At Earth's atmospheric pressure, dry ice sublimates at 194.7 K (78.5 °C; 109.2 °F). The solid is hazardous to handle without protection against frostbite injuries because to the intense cold. While typically not very toxic, the buildup in confined spaces can make the outgassing from it hypercapnic (abnormally elevated blood carbon dioxide levels).

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Answer:

Basically it would be  8.5g. Not total sure.

Explanation:

If its right plz give brainlest.

Answer:

A. 8.5g

Explanation:

Have a great day!

The effective nuclear charge of sulfur is 14, and the effective nuclear charge of chlorine is 15.

Effective nuclear charge (Zeff) is a measure of the positive charge felt by the valence electrons. The effective nuclear charge (Zeff) of s and Cl is calculated using the simple formula zeff = z – s, where z is the atomic number and s is the screening constant. Screening constant (s) is the number of electrons between the nucleus and the valence electrons that shield the valence electrons from the full nuclear charge of the nucleus.

For sulfur (S), the atomic number is 16, and there are two electrons in the innermost shell and four electrons in the second shell. So, the number of valence electrons in sulfur is 6. The screening constant of S is 2. Effective nuclear charge of sulfur = z – s= 16 - 2= 14

For chlorine (Cl), the atomic number is 17, and there are two electrons in the innermost shell and eight electrons in the second shell and seven valence electrons. Therefore, the screening constant of Cl is 2. Effective nuclear charge of chlorine = z – s= 17 - 2= 15

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Answer:

the answer is 120000000 cL

Explanation:

................................

Answer:

Similar chemical characteristic/behavior

Explanation:

Certain elements placed into the same column on the periodic table, because of a similar chemical characteristic/behavior.

Answer:

1.1grams

Explanation:

Find moles of water:

4.5x10^22/(6.02x10^23)=0.07mol

Find molar mass of the water

O=16.00g/mol

0.07x 16.00=1.1 grams

The rate of appearance of Br₂ in the reaction 2HBr(g) → H₂(g) +  Br₂(g) with a disappearance rate of HBr at 0.301 M s-1 is 0.151 M s-1.

To find the rate of appearance of  Br₂, you need to understand the stoichiometry of the balanced chemical equation. In the reaction, 2 moles of HBr are consumed to produce 1 mole of Br₂. This means that the rate of appearance of  Br₂ is half the rate of disappearance of HBr. Since the rate of disappearance of HBr is given as 0.301 M s-1, you can calculate the rate of appearance of  Br₂ by dividing this value by 2:

Rate of appearance of Br₂ = (Rate of disappearance of HBr) / 2
Rate of appearance of Br₂ = 0.301 M s-1 / 2
Rate of appearance of  Br₂ = 0.151 M s-1

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The conjugate base of a compound is what this compound will be after donating a H⁺.

The comopund in question is H₂BO₃⁻. After it loses 1 H⁺, it will have one less H atom and its charge decrease by one. Its charge is only with a "-" sign, which means its chargeis 1-. After decreasing by one, the charge becomes 2-.

So, the conjugate base will be HBO₃²⁻

Answer:

A Biome is way bigger than a ecosystem

Explanation:

answer: biome

because many ecosystems can make up a single biome.

Answer:

A comet

Explanation:

Comets  travel so fats through the solar system that they melt which give them their glowy tail

Answer:

7255455.5%

Explanation:

Giveb that

population in 1630 = 4500

Population in 2017 = 326,500,000

Percentage increase :

((Change in population) / initial population) * 100%

((326,500,000 - 4500) / 4500) * 100%

(326495500 / 4500) * 100%

72554.555 * 100%

= 7255455.5%

Answer: smart guess i have is c

Explanation:

guessing sorry

The energy that is stored in the spring is 2.94 J.

We have to note that the elastic potential energy of the spring is the energy that has been stored in the spring and it is released to be able to do work once we pull the spring.

In this case we already know that;

W = 1/2Ke^2

W = work done

K = force constant

e = extension

Thus;

W = 0.5 * 3 * 1.4^2

W = 2.94 J

We can see that the stored energy for the spring in question is 2.94 J of energy stored.

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The decreasing order of ionization energy will be Mg >Al >P>K.

Ionization energy sometimes referred to as ionization potential, would be the amount of energy it takes to eliminate an electron from a single, isolated atom or molecule.

On moving top to bottom in the periodic table, ionization energy will decrease rapidly.

Al =13 (group 3)

P =15 (group 5)

Mg =12 (group 2)

K =19 (group 1)

The decreasing order of ionization energy will be Mg >Al >P>K.

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The flow of excess funds from surplus economic units to deficit economic units through financial institutions is called intermediation.

Intermediation refers to the process by which financial intermediaries, such as banks, facilitate the transfer of funds from savers (surplus economic units) to borrowers (deficit economic units) in the economy. These intermediaries play a crucial role in connecting those who have excess funds with those who need funds for various purposes, such as investment or consumption.

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The equilibrium constant expression for the given reaction is K = [HF]² / [H₂SO₄] [CaF₂].

The equilibrium constant expression is derived from the balanced chemical equation. In the given reaction, H₂SO₄(aq) and CaF₂(s) react to form 2 HF(g) and CaSO₄(s). The equilibrium constant expression is written by taking the concentration of the products (HF) raised to the power of their stoichiometric coefficient (²) and dividing it by the concentration of the reactants (H₂SO₄ and CaF₂).

Therefore, the equilibrium constant expression for the reaction is K = [HF]² / [H₂SO₄] [CaF₂].

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The correct definition of oxidation in terms of oxygen, electron and hydrogen is added, lost , lost, (Row B).

An oxidation reaction is a reaction in which the oxidation number if the reacting species increases in a positive direction.

Therefore, the correct definition of oxidation in terms of oxygen, electron and hydrogen is added, lost , lost, (Row B).

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The pressure of a gas at a constant temperature in a sealed container will gradually decrease. Option C.

Gases are made up of particles molecules or atoms in constant random motion. Gas particles constantly collide with each other and with the walls of the container. These collisions are elastic. That is, there is no net energy loss due to collision. The pressure of a constant temperature gas in a closed container gradually decreases.

The above statement is incorrect because the pressure of a gas at a constant temperature depends on the volume of the gas. If the container is sealed, the volume of gas is also constant. Collisions are completely elastic. When two molecules collide, they change direction and kinetic energy, but all kinetic energy is conserved. Collisions are not sticky. The average kinetic energy of gas molecules is directly proportional to absolute temperature.

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The metal that is produced by electrolysis of its molten chloride salt among the options given (a. Mg, b. Ca, c. Sr, d. Ba) is option e. All of these.

When an ionic compound is electrolyzed in its molten state, the positive ions (cations) are attracted to the negative electrode (cathode) and are reduced, resulting in the formation of the corresponding metal. In this case, the chloride salts of the metals Mg, Ca, Sr, and Ba are molten and subjected to electrolysis.

During electrolysis, the cations Mg²⁺, Ca²⁺, Sr²⁺, and Ba²⁺ migrate towards the cathode and are reduced to form the respective metals Mg, Ca, Sr, and Ba. This process allows for the extraction of these metals from their chloride salts.

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Answer:

30 % m/V o 23 % m/m

Explanation:

Al leer el problema y entender el enunciado como que se usó suficiente cantidad de agua para obtener 100 mL, con la masa de LiOH podemos determinar la concentración en m/V.

m/V es una concentración que establece la relación de gramos de soluto en 100 mL de solución.

Como los gramos de soluto son 30g, la concentración en m/V es

30/100 = 0.3 % m/V

Podemos también establecer concentración m/m la cual establece la relación como masa de soluto en 100 g de solución. Como el volumen de solución coincide con el de solvente, la masa de solución la podemos obtener sumando masa de solvente + masa de soluto

30 g + 100 g = 130 g

Si tomamos el agua como solvente puro, y por densidad (1 g/mL) la masa de agua es 100g

Así el % m/m lo calculamos como (masa de soluto/masa solucion) . 100

(30g  / 130g) . 100 = 23 % m/m

Answer:

B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O

Explanation:

A redox reaction is one in which oxidation and reduction reactions are occuring simultaneously.

In a redox reaction, an oxidizing agent is reduced ( its oxidation state decreases) whereas a reducing agent is oxidized (it's oxidation state increases).

The nitrogen in the nitrate (v) ion, NO3-, exists in the +5 oxidation state. Therefore it would be acting as an oxidizing agent in any reaction in which it's oxidation state becomes less than +5 after the reaction.

Let us then consider each of the reactions:

A. Reaction 1: in this reaction, the oxidation state of nitrogen remains +5 as what is simply an exchange of radicals in a neutralization reaction.

B. Reaction 2: in this reaction, trioxocarbonate (v) acid oxidizes Copper atom to Copper (ii) ion, while itself it is reduced to Nitrogen (IV) oxide. The oxidation state of nitrogen changes from +5 to +4

C. Reaction 3: in this reaction, what occurs is an exchange of radicals by a displacement reaction. The oxidation state of nitrogen remains the same

D. Reaction 4: in the reaction, what occurs is a neutralization reaction, and the oxidation state of nitrogen remains the same.

Therefore, the correct option is B.

The molecular geometry (form) of CCl4 SF6 is identical to the configuration of the electron domains in a VSEPR.

VSEPR distinguishes between molecular geometry, which defines how the atoms in a molecule are ordered, and electron group geometry, which expresses how electron groups (bonds and nonbonding electron pairs) are arranged.

Chemistry frequently employs the valence-shell electron-pair repulsion (VSEPR) model to foretell the three-dimensional organization, or geometry, of molecules. This model accounts for the repulsion between electron pair to estimate the structure of a molecule.

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