Which of the following reactions is irreversible?

A. Zinc (Zn) reacting with hydrochloric acid (HCl)
B. Haber Process
C. Dehydrating copper sulfate (CuSO4)
D. Thermal decomposition of NH4Cl

PLEASE HELP

Changing the pressure of a gas is a way of changing the volume of the gas.

The volume of a gas is directly proportional to its pressure, meaning that as pressure increases, the volume of the gas decreases, and vice versa. This relationship is known as Boyle's law. Therefore, if you want to change the volume of a gas, you can do so by changing its pressure.

Changing the pressure of a gas can affect not only its volume but also its temperature and density. When you increase the pressure of a gas, you force its molecules closer together, which decreases the space between them and reduces the volume of the gas. Conversely, when you decrease the pressure of a gas, you allow its molecules to move further apart, which increases the space between them and increases the volume of the gas.

However, changing the pressure of a gas can also affect its temperature. When you compress a gas, you add energy to its molecules, which increases their kinetic energy and raises the temperature of the gas. Conversely, when you expand a gas, you remove energy from its molecules, which decreases their kinetic energy and lowers the temperature of the gas.

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Answer:

The dense vapours of carbon tetrachloride forms a protective layer on the burning objects and avoids the oxygen or air to come in contact with the fire from the burning objects and provides incombustible vapours.

Explanation:

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~Zero~

14.1 mL H₂SO₄ is needed to neutralize solution of NaOH.

Balanced chemical equation for neutralization reaction of sulfuric acid and sodium hydroxide:

H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

c(H₂SO₄) = 0.3 M = 0.3 mol/L; concentration of sulfuric acid

V(NaOH) = 34.0 mL = 0.034 L; volume of sodium hydroxide

c(NaOH) = 0.25 M = 0.25 mol/L; concentration of sodium hydroxide

n(NaOH) = c(NaOH) × V(NaOH)

n(NaOH) = 0.25 mol/L × 0.034 L.

n(NaOH) = 0.0085 mol; amount of sodium hydroxide

From chemical reaction: n(H₂SO₄) : n(NaOH) = 1 : 2.

n(H₂SO₄) = 0.0085 mol ÷ 2

n(H₂SO₄) = 0.00425 mol; amount of sulfuric acid

V(H₂SO₄) = n(H₂SO₄) ÷ c(H₂SO₄).

V(H₂SO₄) = 0.00425 mol ÷ 0.3 mol/L.

V(H₂SO₄) = 0.0141 L = 14.1 mL; volume of sulfuric acid

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Answer:

weathering

Explanation:

hope this helps

Answer: 2 : 1

Explanation:

Cation :

Ca - calcium = atomic number = 20

Electron dot configuration : 2, 8, 8, 2

Ca losses 2 electrons in its outermost shell and thus has a charge of 2+ in other to attain a stable octet state.

Anion:

F - has 7 valence electrons and thus needs 1 electron to achieve a stable octet state, hence it accepts one electron has has a charge of (-1)

Therefore,

Ratio of cation (+) to negative (-) = 2 :1

Answer:

D

Explanation:

The salamanders undergo se×ual reproduction.

This is defined as the production of new organisms by the combination of genetic information of two individuals of different genders.

Thus results in variations in the offsprings produced which us why the Salamanders had different color patches.

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Answer:

This is true.

Explanation:

Magnetization of iron is a physical change and not a chemical change as there is no change of state, no change of temperature, no smell and no evolution of gas.

Answer:

B) 22 atoms

Explanation:

Aluminum Acetate has a formula of C6H9AlO6, meaning that it has 6 Carbon atoms, 9 Hydrogen atoms, 1 Aluminum atom, and 6 Oxygen atoms.

In total there are: 6+9+1+6 atoms, or a total of 22 atoms.

Hope this helps!

Answer:

The molecular or chemical formula of Aluminium Acetate is C6H9AlO6.

6-carbon atoms

9-hydrogen atoms

6-oxygen atoms

1-aluminium atom

b. 22 is the right answer

It takes approximately 406,687.5 joules of energy to take 150 grams of ice from -15°C to 125°C.

To determine the amount of energy required to take ice from -15°C to 125°C, we need to consider two stages of the process; Heating the ice from -15°C to 0°C, causing it to melt, and Heating the resulting water from 0°C to 125°C

We can calculate the amount of energy required for each stage separately and then add them together to get the total energy required.

Heating the ice from -15°C to 0°C; The specific heat capacity of ice is 2.09 J/(g·°C), which means that it takes 2.09 joules of energy to raise the temperature of 1 gram of ice by 1°C. Since we have 150 grams of ice, we can calculate the amount of energy required to raise the temperature of the ice from -15°C to 0°C as;

Q1 = m × c × ΔT

= 150 g × 2.09 J/(g·°C) × (0°C - (-15°C))

= 4,987.5 J

Therefore, it takes 4,987.5 joules of energy to heat the ice from -15°C to 0°C

Heating the water from 0°C to 125°C; The specific heat capacity of water is 4.18 J/(g·°C), which means that it takes 4.18 joules of energy to raise the temperature of 1 gram of water by 1°C. We need to heat the water from 0°C to 100°C (the boiling point of water at standard pressure) and then from 100°C to 125°C.

For the first stage, we can calculate the amount of energy required as;

Q₂a = m × c × ΔT

= 150 g × 4.18 J/(g·°C) × (100°C - 0°C)

= 62,700 J

The heat of vaporization of water at standard pressure is 2,260 J/g. Since we have 150 grams of water, we can calculate the amount of energy required to convert all the water to steam as:

Q₂b = m × Lv = 150 g × 2,260 J/g

= 339,000 J

Therefore, it takes a total of;

Q = Q₁ + Q₂a + Q₂b

= 4,987.5 J + 62,700 J + 339,000 J

= 406,687.5 J

Therefore, it takes 406,687.5 joules of energy.

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Answer:

C. 7.50g

Explanation:

The percent (%) by mass of a solute in a solution refers to the number of grams contained in 100g of solution by that solute. In this case, 5% by mass of pottasium chloride (KCl) means 5g of KCl is contained in 100g of solution.

Therefore, in 150g of solution, there would be:

5g/100g × 150g

= 0.05 × 150

= 7.50g of KCl solute.

Hence, 7.50g of pottasium chloride would be expected to be collected by evaporating 150.0 g of the solution.

Running a blank solution is crucial in spectrophotometry experiments to establish the zero %T and account for background absorbance. Without running a blank, the results can be affected by systematic errors.

It is important to run a blank solution to set the zero %T in both Parts 1 and 2 of the experiment because it helps to account for any background absorbance or interference from the solvent or other components in the sample. Running a blank solution allows us to establish a baseline measurement of the solvent or the solution without the analyte, which helps in accurately measuring the absorbance caused by the analyte of interest.

If a blank solution is not run, the results can be affected in several ways:

Systematic Error: The absence of a blank solution can introduce a systematic error, causing a constant offset in the measured absorbance values. This offset can lead to incorrect calculations and interpretations.

Overestimation or Underestimation: Without running a blank, the measured absorbance may include contributions from the solvent or other interfering substances. This can lead to overestimation or underestimation of the analyte concentration, affecting the accuracy of the results.

Distorted Beer's Law Plot: In the absence of a blank, the plot obtained may not accurately represent the linear relationship between concentration and absorbance according to Beer's Law. This can lead to incorrect calculations of the slope (molar absorptivity) and affect the accuracy of future concentration determinations.

In spectrophotometry, the blank solution serves as a reference for setting the zero %T (transmittance) or absorbance value. By measuring the blank, we can account for any absorbance caused by the solvent, impurities, or other components in the sample. The blank solution typically contains all the components except the analyte of interest. It is measured under the same conditions as the sample solutions.

The blank measurement allows us to subtract any background absorbance from the sample measurements, providing a more accurate representation of the absorbance caused solely by the analyte. This helps in obtaining reliable and precise measurements for concentration determination using Beer's Law.

Running a blank solution is crucial in spectrophotometry experiments to establish the zero %T and account for background absorbance. Without running a blank, the results can be affected by systematic errors, inaccurate concentration determinations, and distorted Beer's Law plots. It is important to always include a blank solution to ensure accurate and reliable measurements.

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When the order of the reaction increases the half-life of the reaction decreases. This is because the rate constant k becomes smaller as the order of the reaction increases, and the half-life is inversely proportional to k.

The given chemical reaction:

H₂(g) + I₂(g) → 2HI(g)

Is a second-order reaction, as the overall order of the reaction is 2 (sum of the orders of the reactants). The rate law for this reaction will be:

Rate = k[H₂][I₂]

where k is the rate constant, [H₂] and [I₂] are the concentrations of hydrogen and iodine gases, respectively.

The half-life of a second-order reaction is given by the equation:

\(t_{1/2}\) = 1 / k[A]0

where [A]₀ is the initial concentration of one of the reactants. In this case, we can take either [H₂]₀ or [I₂]₀ as the initial concentration.

Now, increasing the order of the reaction means changing the rate law by increasing the exponent of the concentration term. For example, if the reaction becomes third-order, the rate law would be:

Rate = k[H₂]²[I₂]

If the reaction becomes higher order, the rate law would be even more complex.

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The more kinetic energy a substance has, the warmer it will be and the faster particles will be moving, which reduces the density of the substance

Answer:

The atomic number is the number of protons in the nucleus of an atom . The number of protons define the identity of an element

Answer:

is your question correct

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..

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or not

Among the given molecules, the polar molecule is XeF2. XeF2, or xenon difluoride, has a polar covalent bond and an asymmetrical molecular geometry, making it a polar molecule.

The polarity of a molecule is determined by the difference in electronegativity between its constituent atoms and the overall molecular geometry. In XeF2, xenon (Xe) has a lower electronegativity compared to fluorine (F). As a result, the fluorine atoms exert a greater pull on the shared electrons, creating a partial negative charge (δ-) on each fluorine atom and a partial positive charge (δ+) on the xenon atom.

Additionally, the molecular geometry of XeF2 is linear, with the two fluorine atoms on opposite sides of the central xenon atom. This arrangement leads to an asymmetrical distribution of charge within the molecule, resulting in a net dipole moment and overall polarity.

In contrast, CCl4 (carbon tetrachloride), XeF4 (xenon tetrafluoride), PBr5 (phosphorus pentabromide), and BrF5 (bromine pentafluoride) have symmetrical molecular geometries and/or symmetrical charge distributions, resulting in a net dipole moment of zero. These molecules are considered nonpolar.

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The reaction between 2-bromo-2-methylpropane (commonly known as tert-butyl bromide) and CH3-CH2-OH (ethanol) results in the formation of two products: tert-butyl ethyl ether and hydrogen bromide. The reaction mechanism involved is nucleophilic substitution.

1. Nucleophilic Substitution: Ethanol (CH3-CH2-OH) acts as a nucleophile and replaces the bromine atom in tert-butyl bromide (2-bromo-2-methylpropane) through a nucleophilic substitution reaction.

2. Product 1: The condensed structural formula for tert-butyl ethyl ether (also known as ethoxy-tert-butane) is (CH3)3COCH2CH3. This compound is formed when the ethoxy group (CH3-CH2-O-) of ethanol replaces the bromine atom in tert-butyl bromide.

3. Product 2: Hydrogen bromide (HBr) is formed as a byproduct of the reaction. Its condensed structural formula is HBr.

Therefore, the products of the reaction between 2-bromo-2-methylpropane and CH3-CH2-OH are tert-butyl ethyl ether [(CH3)3COCH2CH3] and hydrogen bromide (HBr). The reaction mechanism involved is nucleophilic substitution.

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Answer:

I think option (D)is not true

Answer: .5m

Explanation:

Volume of the interior of the house in cubic meters = 487.1 m³

Volume of the interior of the house in cubic centimeters = 4.871 × 10^8 cm³

Given the dimensions of the house as 57.0ft length, 38.0ft width and 8.0ft high ceilings.

The volume of the house can be found by using the formula for the volume of a rectangular solid as:

V = lwh

where

V is the volume,

l is the length,

w is the width,

h is the height of the house

Given,

l = 57.0ft

w = 38.0ft

h = 8.0ft

Now, substituting these values in the formula for the volume of the house, we get;

V = lwh

= 57.0 ft × 38.0 ft × 8.0 ft

= 17248.0 cubic feet

We know that 1 cubic meter = 35.3147 cubic feet

Volume of house in cubic meters

V = 17248.0/35.3147 m³ = 487.1 m³

Thus, the volume of the interior of the house in cubic meters is 487.1 m³.

The volume of the interior of the house in cubic centimeters can be found by using the fact that 1 m³ = 10^6 cubic centimeters

Volume of the house in cubic centimeters = 487.1 × 10³ × 10^6= 4.871 × 10^8 cm³

Thus, the volume of the interior of the house in cubic centimeters is 4.871 × 10^8 cm³.

Volume of the interior of the house in cubic meters = 487.1 m³

Volume of the interior of the house in cubic centimeters = 4.871 × 10^8 cm³

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The volume of O₂ required to react with 4.8 L of CO, measured at same temperature and pressure is 2.4 L

To obtain the volume of O₂ required, we shall consider the equation for the reaction, in order to obtain relevant information. This is shown below:

2CO(g) + O₂(g) -> 2CO₂(g)

From the balanced equation above,

2 L of CO required 1 L of O₂

With the above information, we can obtain the volume of O₂ required to react with 4.8 L of CO as follow:

From the balanced equation above,

2 L of CO required 1 L of O₂

Therefore

4.8 L of CO will require = (4.8 × 1) / 2 = 2.4 L of O₂

THus, the volume of O₂ required is 2.4 L

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Complete question:

2CO(g) + O₂(g) -> 2CO₂(g)

for the given reaction, what volume of o2 would be required to react with 4.8 l of co , measured at the same temperature and pressure?

These factors contribute to the formation of a fine-grained microstructure, which can affect the material's mechanical properties.

The melt pool geometry and microstructure of Ti6Al4V with B additions processed by selective laser melting additive manufacturing can be explained as follows:

1. Melt pool geometry: When the Ti6Al4V alloy with B additions is processed using selective laser melting (SLM) additive manufacturing, a laser beam is used to selectively melt the metal powder layer by layer, resulting in the formation of a melt pool. The melt pool geometry refers to the shape and dimensions of this molten region.

2. Microstructure: The microstructure of a material refers to its internal arrangement of grains, phases, and other microstructural features. In the case of Ti6Al4V with B additions processed by SLM, the microstructure is influenced by the rapid solidification that occurs after the melting process. The cooling rate during SLM can lead to the formation of a fine-grained microstructure, which can have an impact on the material's mechanical properties.

3. Manufacturing: Selective laser melting (SLM) is an additive manufacturing process that involves building objects layer by layer using a laser to selectively melt metal powders. In the case of Ti6Al4V with B additions, SLM offers the advantage of producing complex shapes and structures with good mechanical properties.

4. 150: The number "150" mentioned in the question might refer to a specific parameter or condition related to the melt pool geometry and microstructure of Ti6Al4V with B additions processed by SLM. However, without further context, it is not possible to provide a specific explanation for this number.

In summary, the melt pool geometry and microstructure of Ti6Al4V with B additions processed by selective laser melting additive manufacturing can be influenced by factors such as the shape and dimensions of the melt pool, the rapid solidification process, and the cooling rate during SLM. These factors contribute to the formation of a fine-grained microstructure, which can affect the material's mechanical properties.

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Answer:

The density is 2.5625g/mL. Hope this helped! :)

Explanation:

M= 8.2g                                                                               D=M/V

V= 28.3-25.1=3.2mL

D=8.2g/3.2mL

D= 2.5625g/mL

Answer:

4.6706g

Explanation:

Answer:

\(\boxed {\boxed {\sf 4.67 \ g }}\)

Explanation:

We are asked to calculate the mass of a sample of gold. We are given the density and volume.

Density is a substance's mass per unit volume. Therefore, the formula for calculating density is:

\(\rho= \frac{m}{v}\)

The density is 19.3 grams per cubic centimeter and the volume is 0.242 cubic centimeters. Substitute the values into the formula.

\(19.3 \ g/cm^3 = \frac{m}{0.242 \ cm^3}\)

We are solving for the mass of the gold sample, so the variable m must be isolated. It is being divided by 0.242 cubic centimeters. The inverse operation of division is multiplication. Multiply both sides of the equation by 0.242 cm³.

\(0.242 \ cm^3 * 19.3 \ g/cm^3 = \frac{m}{0.242 \ cm^3} * 0.242 \ cm^3\)

\(0.242 \ cm^3 * 19.3 \ g/cm^3 = m\)

The units of cubic centimeters cancel.

\(0.242 * 19.3 \ g = m\)

\(4.6706 \ g = m\)

The original measurements of mass and density both have 3 significant figures, so our answer must have the same. For this number, 3 sig fig is the hundredth place. The 0 in the thousandth place tells us to leave the 7.

\(4.67 \ g \approx m\)

The mass of the gold sample is approximately 4.67 grams.

Answer:

A.) produces the least amount of product.

The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Group 1 of the periodic table consists of hydrogen and the alkali metals. ...

Group 2 consists of the alkaline Earth metals. ...

Groups 3–12 contain transition metals. ...

Groups 13–16 each contain at least one metalloid. ...

Group 17 contains halogens. ...

Group 18 consists of noble gases.

Answer:

Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.

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BRAINLIEST MY ANSWER IF you want

The adjacent nucleotides are bound to each other through a phosphodiester bond in a nucleic acid.

Nucleic acid is a biopolymer made up of nucleotide monomers that make up nucleic acid chains. The nucleotide's three components are a five-carbon sugar, a phosphate group, and a nitrogenous base. Nucleic acids are present in all living cells, including viruses and bacteria, and they play a critical role in storing, transmitting, and expressing genetic information. RNA and DNA are two types of nucleic acids.

The phosphate group in one nucleotide forms a phosphodiester bond with the hydroxyl group on the sugar molecule of the next nucleotide in line in nucleic acids. This reaction is carried out by removing a molecule of water, resulting in a strong covalent bond between two nucleotides. These bonds make up the sugar-phosphate backbone of a nucleic acid chain, which is fundamental to its structure.

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Answer:

In a displacement reaction, a more reactive metal pushes out a less reactive metal from its compound. For example, aluminium displaces iron from iron oxide.

Explanation:

Because aluminium is more reactive than iron, it displaces iron from iron(III) oxide. The aluminium removes oxygen from the iron(III) oxide: iron is reduced.

...

Hope this answer can help you. Have a nice day!

In a displacement reaction, a more reactive metal pushes out a less reactive metal from its compound. For example, aluminium displaces iron from iron oxide.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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Answer:

Assuming you need the names :)

Explanation:

It's dithecous anther