The valence electrons of an atom do not experience the full attractive force of protons in the atom’s nucleus due to the presence of inner core electrons.
The reduction in nuclear charge experienced by valence electrons due to inner core electrons is called the
A. ionization energy effect.
B. nuclear charge effect.
C. periodic law effect.
D. shielding effect.

INFORMATION:

We have the neutralization of a weak base and a strong acid, and we must determine what should be the product of the reaction

STEP BY STEP EXPLANATION:

To determine it, we need to know that:

- The neutralization of a strong acid and strong base has a pH equal to 7. The neutralization of a strong acid and weak base will have a pH of less than 7, and conversely, the resulting pH when a strong base neutralizes a weak acid will be greater than 7.

In our case, we have the neutralization of a weak base and a strong acid, so our product would have a pH of less than 7. Then, knowing that a pH less than 7 represents an acidic, we can state that the product of the reaction will be an acidic.

A strong acid and a weak base yield a weakly acidic solution, not because of the strong acid involved, but because of the conjugate acid of the weak base.

ANSWER:

d. acidic

The volume of hydrogen gas produced in the reaction of 73 grams of zinc and 73 grams of hydrochloric acid (under normal conditions) is approximately 22.4 liters.

To calculate the volume of hydrogen gas produced in the reaction of zinc and hydrochloric acid, we need to use the principles of stoichiometry and the ideal gas law.

First, let's write the balanced chemical equation for the reaction between zinc (Zn) and hydrochloric acid (HCl):

Zn + 2HCl →\(ZnCl_2\)+ H2

From the equation, we can see that one mole of zinc reacts with two moles of hydrochloric acid to produce one mole of hydrogen gas. To determine the number of moles of zinc and hydrochloric acid, we need to convert the given masses into moles.

The molar mass of zinc (Zn) is approximately 65.38 g/mol, so 73 grams of zinc is equal to:

73 g Zn * (1 mol Zn / 65.38 g Zn) ≈ 1.116 mol Zn

Similarly, the molar mass of hydrochloric acid (HCl) is approximately 36.46 g/mol, so 73 grams of HCl is equal to:

73 g HCl * (1 mol HCl / 36.46 g HCl) ≈ 2.002 mol HCl

According to the balanced equation, the reaction produces one mole of hydrogen gas for every two moles of hydrochloric acid. Therefore, since we have 2.002 moles of HCl, we expect to produce half that amount, or approximately 1.001 moles of hydrogen gas.

To calculate the volume of hydrogen gas, we can use the ideal gas law, which states:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. In this case, we assume the reaction is conducted under normal conditions, which means a pressure of 1 atmosphere and a temperature of 273.15 Kelvin.

Rearranging the equation to solve for V, we have:

V = nRT / P

Substituting the values, we get:

V = (1.001 mol) * (0.0821 L·atm/(mol·K)) * (273.15 K) / (1 atm) ≈ 22.4 L

Therefore, the volume of hydrogen gas produced in the reaction is approximately 22.4 liters.

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Answer:

It is equal to the total mass of the products.

Explanation:

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The chemical D is  FeSO4 · 7H2O which is a green crystalline solid. When dissolved in water it gives a very pale green solution. The chemical E is Fe(OH)3 which is reddish brown in color. The chemical F is BaSO4 which is white in color.

D =  FeSO4 · 7H2O hydrated ferrous sulfate.

E = Fe(OH)3 ferric hydroxide

F= BaSO4  barium sulphate

A chemical response happens while one or extra chemical substances are modified into one or extra different chemicals. For Example iron and oxygen combine to make rust. vinegar and baking soda combine to make sodium acetate, carbon dioxide, and water. techniques concerning the atomic nucleus are called nuclear reactions. The substances that participate in a chemical reaction are known as reactants.

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Answer:

It depends on their melting and/or their boiling points, because the heat provides the particles with kinetic energy to break the electrosatic bonds in the substances, which can differ in strength

Explanation:

The pressure exerted by a confined gas is the result of Option b. gas particles colliding with the walls of the container.

The pressure exerted by a confined gas is the result of gas particles colliding with the walls of the container. When a gas is confined within a container, the gas particles are in constant motion, moving in random directions with varying speeds. As these gas particles move, they collide with each other and with the walls of the container.

When a gas particle collides with the walls of the container, it exerts a force on the surface. The collective effect of numerous gas particle collisions leads to a net force being exerted on the walls of the container. This force per unit area is what we call pressure.

The more frequently and vigorously the gas particles collide with the walls, the higher the pressure of the gas. Factors that influence gas pressure include the number of gas particles present, their average speed, and the volume of the container. Therefore, Option b is correct.

The question was incomplete. find the full content below:

The pressure exerted by a confined gas is the result of

a. gas particles colliding with each other

b. gas particles colliding with the walls of the container

c. nobody knows, it just is

d. gas particles taking up space in the container.

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According to the statement, we have the following balanced reaction:

We see that the ratio BaCl2 to Na2SO4 is 1/1, that is, the same amount of moles of both reactants are needed to react completely. Now, to find the normality of the solution we will follow the following steps.

1. We find the moles of Na2SO4 by dividing the given mass by its molar mass.

2. We find the moles of BaCl2 by the stoichiometry of the reaction.

3. We apply the normality equation. Normality indicates the amount of solute equivalents in 1 liter of solution, it is very similar to molarity, but here we will do a little conversion.

Let's proceed with the calculation.

1. Moles of Na2SO4

2. Moles of BaCl2

It will be the same moles of Na2SO4, so moles of BaCl2 will be 3.90x10^-4 mol

3. Normality of the solution

It is known that in 1 mol of BaCl2 there are 2 equivalents. So, we have:

The normality of the solution will be: 0.142N

The ion with a +3 charge, 28 electrons, and an atomic mass of 71 is the aluminum ion (\(Al^{3+}\)).

Aluminum (Al) typically has an atomic number of 13, which means it has 13 protons and 13 electrons in its neutral state. However, in the given ion, \(Al^{3+}\), the ion has lost three electrons, resulting in a +3 charge. This means that the ion now has 13 protons and only 10 electrons remaining, giving it a net positive charge of +3.

The atomic mass of aluminum is 26.98 atomic mass units (amu). The given ion has an atomic mass of 71 amu, which suggests that the ion has gained additional particles. In this case, the ion has also gained three neutrons, resulting in a higher atomic mass.

The total number of particles (protons, neutrons, and electrons) in the ion can be calculated by adding the number of protons (13) and the number of neutrons (3), which equals 16. Since the ion has a net charge of +3, it only contains 10 electrons.

In summary, the ion with a +3 charge, 28 electrons, and an atomic mass of 71 is the aluminum ion (\(Al^{3+}\)), which has 13 protons, 10 electrons, and 3 neutrons.

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Answer:

2024.70 J

Explanation:

The heat capacity of the coffee cup calorimeter can be calculated using the following formula:

q_calorimeter = q_water + q_water_final

where q_calorimeter is the heat absorbed by the coffee cup calorimeter, q_water is the heat lost by the warm water, and q_water_final is the heat gained by the cold water.

First, calculate q_water:

q_water = m_water * c_water * ΔT

where m_water = 25.0 g is the mass of the warm water, c_water = 4.184 J/g°C is the specific heat of water, and ΔT = (40.0°C - 29.5°C) = 10.5°C is the change in temperature.

q_water = 25.0 g * 4.184 J/g°C * 10.5°C = 1057.35 J

Next, calculate q_water_final:

q_water_final = m_water * c_water * ΔT

where m_water = 25.0 g is the mass of the cold water, c_water = 4.184 J/g°C is the specific heat of water, and ΔT = (29.5°C - 20.0°C) = 9.5°C is the change in temperature.

q_water_final = 25.0 g * 4.184 J/g°C * 9.5°C = 967.35 J

Finally, calculate the heat capacity of the coffee cup calorimeter:

q_calorimeter = q_water + q_water_final = 1057.35 J + 967.35 J = 2024.70 J

So the heat capacity of the coffee cup calorimeter is 2024.70 J.

A 25.0 g sample of warm water at 40.0⁰C was added to a 25.0 g sample of water in a Styrofoam coffee cup calorimeter initially at 20.0⁰C. 2024.70 J is the heat capacity of the coffee cup calorimeter.

A physical feature of matter known as heat capacity and thermal capacity is the quantity of heat that must be applied to an object in order to cause a unit change in temperature. Heat capacity is measured in joules per kelvin (J/K), the SI unit. A broad property is heat capacity.

The particular heat capacity, which can be calculated by dividing an object's heat capacity by its mass, is the comparable intense attribute. The molar heat capacity is obtained through dividing the specific heat even by molecular weight of the substance. The heat capacity per volume is gauged by the volumetric heat capacity. The term "thermal mass" is frequently used in civil engineering and architecture to describe a building's ability to hold heat.

q calorimeter = q water + q water final

q water = m ×c water ×ΔT

q water = 25.0 g×4.184 J/g°C ×10.5°C

              = 1057.35 J

q water final = m×c of water × ΔT

q water final = 25.0 g×4.184 J/g°C ×9.5°C

                   = 967.35 J

q calorimeter = q water + q water final

                      = 1057.35 J + 967.35 J

                      = 2024.70 J

Therefore,  2024.70 J is the heat capacity of the coffee cup calorimeter.

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Answer:

The variables in Gay-Lussac's law are the initial temperature (T1), the initial pressure (P1), the final temperature (T2) and the final pressure (P2)....

Explanation:

Answer:

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The Kc is 2.8 * 10^24

In chemistry, Kp usually refers to the equilibrium constant of a reaction that involves gases. It is defined as the ratio of the partial pressures of the products to the partial pressures of the reactants, each raised to the power of their stoichiometric coefficients.

Kp= Kc (RT)^Δn

Thus;

Kc = Kp/(RT)^Δn

Kc = 2.24 × 10²² /(0.082 * 1546)^-1

Kc = 2.8 * 10^24

Thus the Kc of the reaction when we consider the concentration of the reactants is  2.8 * 10^24

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Answer:

the water molecules have more energy and are moving faster than the molecules of cold water. This makes it easier for the dye to get mixed throughout the hot water.

Explanation:

Answer:

Because particles moves more by kinetic energy and diffusion will spread with the particles

Explanation:

Answer:

B: Na(s) + Cl2(g) + 3O2(g) = 2NaClO3(s)

Explanation:

We are looking for enthalpy of formation, so we want to see reactance in their natural standard form.

Thus, we want to see the reactance of Na, Cl2 and O2.

The only option that has the correct form of Na, Cl2 and O2 is B.

Na(s) + Cl2(g) + 3O2(g) = 2NaClO3(s)

If an equation includes 7(CrO₄)₂, the numbers of Cr's and O's atoms that are there are 14 and 56 respectively.

The number of atoms present in a chemical compound can be calculated by multiplying the subscript of the particular element by any coefficient.

According to this question, 7 moles of chromate with the chemical formula; (CrO₄)₂ is given. The number of oxygen and chromium atoms in this compound can be calculated as follows:

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Answer:

density = m÷V

= 116÷33

= 3.5151515151...

Solar panels are mainly to obtain the sun's energy in the form of radiation to generate electrical energy. To capture the sun's energy, photovoltaic cells are used that work almost like a battery. The received sunlight separates the electrons so that they form a layer of positive charge and another negative charge in the solar cell. This potential difference generates an electrical current. These panels are in turn connected to a battery that stores the electricity generated and it is this charge that is used. These panels are in turn connected to a battery that stores the electricity generated and it is this charge that is used.

The basic units of the human body are called cells, and they carry out specialized tasks to keep the body alive. Cells in a city might be compared to people who perform particular duties and contribute to the general efficiency of the city.

Organizational hierarchy is built up from lower levels. Consequently, molecules combine to create molecules, molecules create cells, cells create tissues, tissues create organs, organs create organ systems, and organ systems create beings. The body's next level of organisation. A tissue is made up of related cells with a common purpose. Human tissues can be divided into four categories: epithelial, muscular, nerve, and connective.

The major levels of organisation in the body, from the most basic to the most complex, are atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human body.

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The reaction 0.01 moles of HCL and 0.005 moles of sodium carbonate are employed.

(a) Carbon dioxide gas is released when sodium hydrogen carbonate and diluted hydrochloric acid interact. Carbon dioxide can be detected by passing it through lime water, which turns milky, or by observing the formation of a white precipitate of calcium carbonate. The gas's identity as carbon dioxide is therefore confirmed.

(b) i-When methyl orange is added to diluted hydrochloric acid, the solution's color changes to red. A common pH indicator used in the titration is methyl orange.

ii & iii  Given:

0.1 molar in 10 milliliter With 16.2 ml of sodium carbonate solution, diluted HCL is titrated.

Solution:

How much HCL will be used—in moles.

Solution:

NaCl (aq) + CO2 (g) + H2O = Na2CO3 (aq) + 2 HCl (aq) (l)

Knowing that,

Molarity = (n/v)*100

For HCL remedy

0.1 = [n/10]*100

1.01 moles, or n.

2 moles of HCL are needed for 1 mole of sodium carbonate.

=> Half a mole of sodium carbonate is needed for every mole of HCL.

=> 0.005 mole of sodium carbonate is needed for every 0.01 mole of HCL.

Consequently, 0.01 moles of HCL and 0.005 moles of sodium carbonate are employed.

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Answer:

radiant energy

Explanation:

microwaves convert electrical energy into radiant energy

Answer:

wdym?

Explanation:

Answer: Mendeleev predicted elements that would later be discovered.

The concentration of the citric acid is 0.090 mol/dm3 based on the given titration results.

To calculate the concentration of the citric acid, we need to use the stoichiometry of the balanced chemical equation and the volume of sodium hydroxide used.

The balanced equation for the reaction between citric acid (C6H807) and sodium hydroxide (NaOH) is:

C6H807 + 3NaOH → C6H507Na3 + 3H2O

From the equation, we can see that 1 mole of citric acid reacts with 3 moles of sodium hydroxide.

First, let's calculate the number of moles of sodium hydroxide used in the titration. We know that the volume of the sodium hydroxide solution is 25 cm3 and its concentration is 0.150 mol/dm3.

Moles of NaOH = concentration × volume

= 0.150 mol/dm3 × 0.025 dm3

= 0.00375 mol

Since the stoichiometry of the reaction is 1:3 between citric acid and sodium hydroxide, the number of moles of citric acid is three times the number of moles of sodium hydroxide used in the titration.

Moles of C6H807 = 3 × 0.00375 mol

= 0.01125 mol

Now, we can calculate the concentration of the citric acid.

Concentration of citric acid = moles of C6H807/volume of C6H807

= 0.01125 mol / (12.50 cm3/1000)

= 0.090 mol/dm3

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Answer:

20KJ

Explanation:

Answer:

No, compound A and B are not the same compound

Explanation:

According to the law of definite proportion "every chemical compound contains fixed and constant proportions (by mass) of its constituent elements." (Encyclopedia Britannica)

We can see in the question that the ratio of flourine to sulphur in compound A is 1.18 while the ratio of flourine to sulphur in compound B is 2.37.

The two chemical compounds do not contain a fixed proportion by mass of their constituent elements therefore, they can not be same compound according to the law of definite proportions.

Homogeneous mixture are Brass, Vodka and Sugar; while Heterogeneous mixture are Gravel and Potato salad.

A homogeneous mixture is a type of mixture where the composition is uniform and the same throughout. Examples of homogeneous mixtures include saltwater, air, and vinegar. These mixtures have a consistent appearance and properties, and their individual components cannot be easily separated.

A heterogeneous mixture is a mixture where the composition is not uniform and can vary in different parts of the mixture. Examples of heterogeneous mixtures include salad, fruit punch, and soil. These mixtures have varying appearance and properties, and their individual components can be easily separated.

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The sequences were already outlined therefore she didn't have any difficulty in choosing between math and poetry.

A sequence is an orderly arrangement of events or objects. When objects or events are arranged in a sequence, decision making becomes much easier.

For the task at hand, since the sequences were already outlined, then she didn't have any difficulty in choosing between math and poetry.

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Answer:

to solve an equation