I really need help with this question. This is for chemistry

Answer:

1. Proton = 4

2. Neutron = 5

3. Electron = 2

Explanation:

9 4Be^2+

From the above, we obtained the following:

Atomic number = 4

Mass number = 9

Charge = +2

1. Determination of the proton.

Atomic number is simply defined as the proton number. This implies that:

Atomic number = proton number

Atomic number = 4

Therefore,

4 = proton number

Proton = 4

2. Determination of the Neutron.

Mass number = Proton + Neutron

Mass number = 9

Proton = 4

Neutron =?

Mass number = Proton + Neutron

9 = 4 + Neutron

Collect like terms

Neutron = 9 – 4

Neutron = 5

3. Determination of the electron.

From the question given

9 4Be^2+

The atom has a charge of +2. This implies that the atom has lose 2 electrons. Thus we can obtain the electron as follow:

Proton = 4

Charge = +2

Electron =?

Electron = Proton – charge

Electron = 4 – 2

Electron = 2

The Ksp values for potential precipitates must differ by at least a factor of 10 in order for selective precipitation to occur.

Selective precipitation is a technique used to separate ions in a solution based on their solubility product constants (Ksp). The Ksp value represents the equilibrium constant for the dissolution of an ionic compound into its constituent ions.

When selective precipitation is employed, we want to ensure that only one of the potential precipitates forms while the others remain in solution. This can be achieved by exploiting the differences in solubilities among the ions.

The solubility of an ionic compound is directly related to its Ksp value. The lower the Ksp value, the less soluble the compound is in the solvent.

To determine the minimum difference in Ksp values required for selective precipitation, we need to consider the ratio of the solubilities of the compounds. Since solubility is inversely proportional to Ksp, we can compare the Ksp values directly.

Let's say we have two potential precipitates with Ksp values Ksp1 and Ksp2, where Ksp1 is the smaller value. For selective precipitation to occur, we need the solubility of compound 1 (Ksp1) to be significantly lower than compound 2 (Ksp2).

A common rule of thumb is that the Ksp values should differ by at least a factor of 10.

Mathematically, this can be expressed as Ksp1 / Ksp2 ≤ 0.1

In order for selective precipitation to occur, the Ksp values for potential precipitates must differ by at least a factor of 10. This ensures that one compound has significantly lower solubility than the others, allowing it to precipitate while the others remain in solution.

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In addition to oxygen (O2) and nitrogen (N2), other gases that contribute to the total pressure include carbon dioxide (CO2), water vapor (H2O), and traces of other gases such as argon (Ar), helium (He), and neon (Ne).

Carbon dioxide is produced as a waste product of cellular metabolism and is transported from the tissues to the lungs for exhalation. It contributes to the partial pressure of gases in the alveoli.

Water vapor is produced through the process of respiration and adds to the total pressure. As we breathe, the air gets humidified in the respiratory tract, leading to the presence of water vapor in the alveoli.

Traces of other gases, such as argon, helium, and neon, are present in the atmosphere in small quantities and can also contribute to the total pressure in the alveoli. However, their concentrations are much lower compared to oxygen and nitrogen.

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Answer:

Explanation:

As,

Law of reflection states that , angle of incidence is always equal to angle of reflection.

Answer:

a salt and water is the answer.

Answer:

Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level.

Elements: Argon

in the right side of the periodic table . It is group 18 called nobel gas or group This group has all element in stable form each has 8 electron in outermost orbit they are non reactive

Answer:  2 protons

Explanation:

The element number, 2 for He, is the number of protons in the nucleus.  The 4.0026 is the average atomic mass of He.

Answer:

700 mL of ethanol would be added

Explanation:

Given data:

Volume of ethanol added to make 40% v/v solution = ?

Total volume of solution = 1750 mL

Solution:

We will calculate the 40% 1750 mL which will be the volume of ethanol added to the water to make 40%v/v solution.

(40/100)× 1750 mL

0.4 × 1750 mL

700 mL

700 mL of ethanol would be added.

Moles of ammonia is 2.4 moles

Molarity of solution after dilution is 2.4 M

Given:

volume of ammonia solution = 0.40 l

molarity of solution = 6.00 m

To Find:

moles of ammonia

Solution:

1 molar (M) solution will contain 1.0 GMW of a substance dissolved in water to make 1 liter of final solution

M = n / V

M is the molality of the solution that is to be calculated

n is the number of moles of the solute

V is the volume of solution given in terms of litres

n = M x V

= 6 x 0.4

= 2.4 moles

So moles of ammonia are 2.4 moles

molarity of the resulting solution after dilution

M = n/V

= 2.4/1

= 2.4 M

So Molarity after dilution will be 2.4 M

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Answer:

C. the same amount of energy as

Explanation:

Firstly, a chemical reaction can either absorb energy from its surroundings to occur or release energy into its surroundings as a product. The former and latter descriptions are called ENDOTHERMIC and EXOTHERMIC reactions respectively. An exothermic reaction is that which transfers energy, in form of heat, to its surroundings while an Endothermic reaction is that which absorbs energy (heat) from its surroundings.

However, a reversible reaction is that reaction in which the formation of products from reactants and reformation of the reactants from products occur simultaneously. Hence, the products of a reversible reaction can become the reactants and move in the opposite direction. For example:

Reversible reaction: A + B ⇆ C + D means;

A + B → C + D and;

C + D → A + B

In a case whereby the opposite reactions consist of an endothermic and exothermic reactions, the endothermic reaction absorbs the same amount of energy as the exothermic reaction releases.

According to the law of conservation of energy, no energy is lost during a reversible reaction. Hence, in order to achieve an equilibrium, the amount of energy absorbed by the endothermic reaction is the same as the amount of energy released in the opposite exothermic reaction.

0.25 moles of carbon dioxide has a greater mass which is equal to 11g.

There is a formula that reads,

"Mass = molecular mass × moles"

The molecular mass of carbon dioxide is 44 and remains constant.

Plugging in the equations we get,

Mass = 44 × 0.25

Mass of carbon dioxide = 11g.

Again, for mass of carbon monoxide, we get;

1 mole CO contains 6.022 × \(10^{23}\) molecules of CO.

So, mass of 6.022 × \(10^{23}\) molecules of CO = 28 g.

Therefore, mass of 1.5 × \(10^{23}\) molecules of CO,

 (1.5×\(10^{23}\) ×28) / (6.022×\(10^{23}\)) = 6.97g ≈ 7g

Therefore,  0.25 moles of carbon dioxide has a greater mass.

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The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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Galvanic cells or voltaic cells can generate electricity through the use of a spontaneous reaction.

A galvanic cell or voltaic cell can be described as an electrochemical cell in which electricity is generated from spontaneous Oxidation-Reduction reactions.

A common apparatus consists of two different metals or electrodes, each immersed in different beakers containing their respective ion solution, They are connected by a salt bridge or a porous membrane.

Galvanic cells carry the spontaneous redox reactions but have been designed to harness the energy generated from the said reaction. The electromotive force of the cell can be defined as the difference between the half-cell potentials which are measured by the two electrodes in the electrolyte.

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The molar solubility of magnesium hydroxide in water is approximately 2.27×10⁻⁴ mol/L.

To find the molar solubility of magnesium hydroxide (Mg(OH)₂), we need to determine the concentration of Mg²⁺ and OH⁻ ions in a saturated solution.

The balanced equation for the dissociation of magnesium hydroxide is:

Mg(OH)₂(s) ⇌ Mg²⁺(aq) + 2OH⁻(aq)

Let's assume the molar solubility of Mg(OH)₂ is "x" mol/L.

The solubility product constant, Ksp, is given as 1.2×10⁻¹¹, and it represents the equilibrium expression for the dissociation of Mg(OH)₂:

Ksp = [Mg²⁺][OH⁻]²

Since Mg(OH)₂ dissociates to form one Mg²⁺ ion and two OH⁻ ions, we can express the equilibrium concentrations as:

[Mg²⁺] = x mol/L

[OH⁻] = 2x mol/L

Substituting these values into the Ksp expression:

Ksp = (x)(2x)² = 4x³

Given that Ksp = 1.2×10⁻¹¹, we can set up the equation:

4x³ = 1.2×10⁻¹¹

x = ∛(1.2×10⁻¹¹/4)

x ≈ 2.27×10⁻⁴ mol/L

Therefore, the molar solubility of magnesium hydroxide in water, as determined by the Ksp value, is approximately 2.27×10⁻⁴ mol/L.

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Answer:

1. whales  are mammals and fish are not

2. Fish have gills which extract oxygen from the water and thus allow it to live underwater its entire life. Whales on the other hand do not have gills but instead have one or two blowholes

3. whales provide milk to their young and fish do not!

Explanation:

The alpha isomer of a carbohydrate has the anomeric OH on the same side of the  \(CH_{2}OH\) group (option A).

The alpha isomer of a carbohydrate has A) The anomeric OH on the same side of the \(CH_{2}OH\) group. This configuration is what differentiates it from the beta isomer, which has the anomeric OH on the opposite side of the  \(CH_{2}OH\) group. This means that the hydroxyl group (-OH) attached to the anomeric carbon (the carbon that is bonded to two oxygen atoms) is on the same side as the  \(CH_{2}OH\) group in the cyclic structure of the carbohydrate. The beta isomer, on the other hand, has the anomeric OH on the opposite side of the  \(CH_{2}OH\) group (option B). If there is no anomeric OH group, then it is not a cyclic carbohydrate and is instead an open-chain form (option C).

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Answer:

The periodic table is a set of elements organized by their atomic number, from lowest (hydrogen 1) to highest (oganesson 118). That number is the amount of protons in the nucleus of an atom of the element. The table is split into three groups of elements (metals, nonmetals and metalloids). As you go down the table the elements are more reactive.

Explanation:

^^

The molecular geometry of BrF5 is sqaure pyramidal and the approximate bond angle is 120 degrees which is c.

The total number of valence electrons in bromine pentafluoride (BrF5) can be determined by adding the valence electrons of each atom. Bromine has 7 valence electrons and each fluorine atom has 7 valence electrons, so the total number of valence electrons in BrF5 is:

7 (from bromine) + 5(7) (from five fluorine atoms) = 42 electrons

The molecular geometry of BrF5 is square pyramidal, which means that it has one central bromine atom surrounded by five fluorine atoms. The shape of the molecule is distorted from a perfect octahedron due to the lone pair of electrons on bromine.

The approximate bond angles in BrF5 are 90 degrees for the axial fluorine atoms and 120 degrees for the equatorial fluorine atoms. The lone pair on bromine occupies an equatorial position, further distorting the bond angles. Therefore, the correct answer is c. 120 degrees.

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Answer:

Nvr XD

Explanation:

Answer:

the world may never know

Explanation:

A mass of gas has a pressure of 450 kPa and temperature of 140°C. The pressure is doubled during a process but the volume remains unchanged.

In order to solve this problem, we need to apply Charles' Law: V1/T1 = V2/T2. Since the volume remains unchanged, we can simplify this to T1/P1 = T2/P2. T1 and P1 are the initial temperature and pressure, respectively. T2 is the unknown final temperature, and P2 is double the initial pressure (i.e., 2P1).

Substituting the given values:140 + 273 = 413 K450 kPa * (2) = 900 kPa413 K/450 kPa = T2/900 kPaT2 = (413 K / 450 kPa) * (900 kPa) = 756 KWe must then subtract 273 to convert from kelvin to Celsius. Therefore, T2 = 483°C, which is the new temperature.

In this case, the gas law to apply is Charles’ law which states that at a constant pressure, the volume of a fixed amount of gas is directly proportional to its absolute temperature. The general equation of Charles' law is V1/T1 = V2/T2, where V is the volume of the gas, T is the temperature, and the subscripts 1 and 2 denote initial and final states, respectively. For our question, since the volume remains unchanged, we can simplify this to T1/P1 = T2/P2. T1 and P1 are the initial temperature and pressure, respectively. T2 is the unknown final temperature, and P2 is double the initial pressure (i.e., 2P1).

Therefore, T2 = (T1 x P2)/P1. We can substitute the given values into the formula and solve for T2 as follows.

140 + 273 = 413 K450 kPa x 2 = 900 kPa

T2 = (413 K x 900 kPa)/450 kPa = 826 K

Subtracting the value of absolute zero (273) from 826, we obtain T2 = 553°C. This is the final temperature of the gas after doubling the pressure.

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Answer:

Advantages of Wind Energy -

Disadvantages of Wind Energy-

https://justenergy.com/blog/wind-energy-pros-and-cons/

hope this site might help you with the details

An indicator of a chemical change which is shown in the image (see attachment) is: A.) formation of a gas.

A chemical change can be defined as a type of reaction that is typically characterized by a change in chemical composition and this leads to the formation of a new chemical substance.

This ultimately implies that, a chemical change would give rise to the chemical properties of matter by causing the transformation of one chemical substance into one or more different chemical substances.

In this context, we can infer and logically deduce that the formation of a gas is an indicator of a chemical change in the image (see attachment) shown below because the liquid turned to a gas when heat was applied.

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Complete Question:

Which indicator of a chemical change is shown?

A.) formation of a gas

B.) formation of a precipitate

C.) change in color

D.) change in energy

Answer:

Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

Answer:

Change in Color

Heat is released (bubbles in solution)

Sometimes even a change in texture

A new smell

Formation of a precipitate

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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The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.


The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.

The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.

The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.

So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons

In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion

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Answer: Water is the material an ocean wave moves through.

Explanation: An ocean wave and a sound wave are very similar because the water acts as the medium. The waves travel through the water just like a sound wave would travel through the medium.

The reason why the litmus paper can be used is because the reaction of bromotriphenylmethane and ethanol produces HCl.

We define the litmus paper as any piece of paper that have been coated with an organic material such that the dye can interact with an acid or a base and lead to a change in the color of the dye and the paper respectively.

Thus, the color of litmus paper would differ in an acidic and a basic solution as it were. When there is a chemical reaction between bromotriphenylmethane and ethanol we also obtain hydrochloric acid as one of the products and it is able to have some kind of interaction with the litmus paper making it to have a color change.

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The valence shell electron repulsion theory (VSEPR) determines the molecular shape by using the numbers of valence electron pairs present in the outermost shell.

The valence shell electron repulsion theory (VSEPR) is a model for predicting 3D molecular shape by using the number of valence shell electron bond pairs between atoms in a molecule.

Molecular shape is a process used to discover the shape of a molecule based on the repulsion happening among bond electron pairs in the outermost electron shell.

It is important to study the molecular shape or geometry because most physical and chemical properties are being influenced by their molecular shape.

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