The ion having with a 2+ charge and a configuration of 28,8
​

Answer:

Similar properties

Explanation:

Potassium (K) has atomic number 19 which means its electron configuration (pattern of electrons in it's energy levels (electron shells)) is 2·8·8·1 while Copper (Cu) has atomic number 29 which means its electron configuration is 2·8·8·8·3 hence Potassium has 4 electron shells while Copper has 5

Potassium has 19 protons (from its atomic number) while Copper has 29 protons

The number of protons and electrons is usually the same (in an atom) (that's why atoms don't naturally have charges i.e they're usually neutral) so Potassium has about 19 electrons while Copper has about 29 electrons.

So similar properties automatically becomes your answer cuz the rest are wrong.

A chemical formula is a group of chemical symbols and numbers that express the elements and the number of atoms of each element that compose a compound.

A chemical formula of a compound offers information about the proportions of each chemical element in a given chemical compound or molecule.

The chemical formula of a compound can be written by including the chemical symbols of elements, numbers as subscripts, and symbols, such as plus (+) and minus (−) signs, dashes, commas, and brackets.

A chemical formula exhibits no words but simple chemical structures can be drawn but not full structures. Chemical formulae must be limited in power rather than chemical structural formulae.

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The mystery element that remains solid at room temperature and also breaks very easily is a :  Non-metal  ( B )

A non metal is non conducting element at room temperature, which can be in gas, sold and liquid forms at room temperature, when in solid form they can break easily and do not bend as well. Non-metals are poor conductors of heat and electricity therefore will not conduct electricity when placed in a circuit. An example of a solid non-metal is Carbon.

Hence we can conclude that the mystery element is a Non-metal

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Answer: They can be apllied to the senario he can pettition or he can use bigger bags those are just a couple of ideas.

Answer:

It may leave some chemicals such as herbicides and pesticides in the water

Explanation:

i just took the test

Distillation may leave some chemicals such as herbicides and pesticides in the water. Therefore, option D is correct.

By using selective boiling and condensation, distillation, also known as traditional distillation, is the process of removing the constituents or compounds from a liquid mixture. The process of heating solid materials to create gaseous products is known as dry distillation.

A chemical is purified through distillation by being separated from a non-volatile or less-volatile substance. Because various compounds frequently have different boiling points, when a mixture is distilled, the components frequently separate from the mixture.

Among the many industrial uses of distillation are the production of alcoholic drinks, water purification, and oil refining. Distillation is a physical procedure that removes desired pure compounds from an initial source using heat and other techniques.

Thus, option D is correct.

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If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

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Answer:

3

Explanation:

the half life of a radioactive isotope is the amount of time one half of the isotope takes to decay

after 5 minutes the mass will be 24

after 10 minutes the mass will be 12

after 15 minutes the mass will be 6

after 20 minutes the mass will be 3

Answer:

There would be three Lithium atoms per one Nitrogen atom.

3:1

Li3N (Lithium Nitride)

Explanation:

Group 15 elements usually have 5 valence electrons, and every atom wants to have a full valence shell of valence electrons. So, nitrogen can get three electrons from each Lithium atom in order to get a full octet.

The oxidation number of bromine in bro−3 is +5, while the oxidation number of oxygen is -2 for each of the three oxygen atoms.

To assign oxidation numbers to each atom in bro−3, we first need to understand the rules for assigning oxidation numbers. The oxidation number of oxygen in most compounds is -2, and the sum of oxidation numbers of all the atoms in a compound must be equal to the overall charge of the compound.

In the case of bro−3, we know that the overall charge of the ion is -1, so the sum of the oxidation numbers of all the atoms must be equal to -1.

Since there are three oxygen atoms in bro−3, their combined oxidation number is -6. Therefore, the oxidation number of bromine must be +5 to balance out the negative charge and give a net oxidation number of -1.


1. Oxygen usually has an oxidation number of -2, except in peroxides (like H₂O₂) where it is -1. In BrO₃⁻, oxygen is not in a peroxide, so its oxidation number is -2.

2. There are three oxygen atoms in BrO₃⁻, each with an oxidation number of -2. The total contribution from the oxygen atoms is 3(-2) = -6.

3. The overall charge of the BrO₃⁻ ion is -1. To balance this charge, the oxidation number of Br must be +5 (since +5 - 6 = -1).

So, the oxidation numbers are +5 for Br and -2 for each O in the BrO₃⁻ ion.

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Answer: true

Explanation:

2.5 cm does = 25mm

Answer:

True

Because, all of these metric units differ from one another by a multiple of 10.

Answer:

2NaOH+ H2SO4 → Na2SO4 + 2H2O

HAVE A GREAT DAY :)

Answer:

Sodium+sulphate=Na2SO4

Acidsodium sulphate + hydrogen=Na2SO4+H2O

Explanation:

\(CO _{2} \: and \: H _{2} O\)

Reactants must be on the left hand side of the reaction

Answer:

Both types of waves transfer energy

Explanation:

I think that's right

Electromagnetic waves and sound waves  both types of waves can transfer energy.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

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The reaction is stereospecific is false about  Diels-Alder reaction.

Thus, A conjugated diene and an alkene (dienophile) react to generate unsaturated six-membered rings in the Diels-Alder reaction. The reaction is also known as a "cycloaddition" because it results in the production of a cyclic product via a cyclic transition state.

The Diels-Alder reaction is an electrocyclic reaction that involves the [4+2]cycloaddition of 2 electrons from the dienophile (an alkene or an alkyne) and 4 electrons from the conjugated diene. New -bonds, which are energetically more stable than the -bonds, are formed during the process.

Two German chemists, Otto Diels and Kurt Alder, discovered this reaction in 1928, and it is extremely important for synthetic processes. In 1950, they received the Nobel Prize.

Thus, The reaction is stereospecific is false about  Diels-Alder reaction.

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"The reaction is stereospecific" is a false statement about Diels-Alder reaction. The correct option is A.

A conjugated diene and a dienophile are combined to generate a cyclic product known as a cycloadduct in the Diels-Alder process, which is a pericyclic reaction. Despite having stereoselectivity, the Diels-Alder reaction is not thought to be stereospecific.

The word "stereospecificity" describes a reaction in which the stereochemistry of the reactant, dictates the stereochemistry of the result. The stereochemistry of the reactants in the Diels-Alder reaction also does not always determine the stereochemistry of the product.

Thus, the ideal selection is option A.

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Giant molecules are also referred to as macromolecules and polymers when numerous molecules are combined. These atoms are arranged in a three-dimensional structure and are joined by covalent bonds.

A giant molecule, also known as a macromolecule, is a usually large molecule crucial to biophysical processes, such as a protein or nucleic acid. It is made up of many atoms that are covalently bound. Large non-polymeric molecules including lipids and macrocycles, as well as biopolymers, are the most prevalent macromolecules in biochemistry. In addition to synthetic fibers, giant molecules can also be found in research materials like carbon nanotubes.

Different experts use different terminology for giant molecules. For instance, in biology, giant molecules refer to the four immense molecules that make up living things, while in chemistry, it refers to aggregates of two or more molecules that are held together by intermolecular forces rather than covalent bonds yet that is difficult to dissolve apart. The term giant molecule is frequently referred to as high polymer in British English.

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Considering the definition of empirical formula, the empirical formula of the compound is SO₂.

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms.

A compound is found to contain 50.05% sulfur and 49.95% oxygen by mass. Assuming a 100 grams sample, the percentages match the grams in the sample. Then, you have 50.05 grams of sulfur and 49.95 grams of oxygen.

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

Therefore the S: O mole ratio is 1: 2

Finally, the empirical formula is S₁O₂= SO₂.

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The number of protons in an atom always determines its identity.

Each atom has a unique number of protons in its nucleus, which is also known as the atomic number. This number is what distinguishes one element from another.

For example, all carbon atoms have six protons, while all oxygen atoms have eight protons. The number of protons also determines the arrangement of electrons around the nucleus, which plays a role in chemical reactions.

While the number of neutrons and electrons can vary within an element, the number of protons remains constant and determines the identity of the atom.

This is why the periodic table is arranged by atomic number, as it groups together elements with the same number of protons and therefore similar chemical properties. Overall, the number of protons in an atom is the key characteristic that determines its identity.

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Answer:

λ  = 3.0 × 10⁻¹² m

Explanation:

Speed of Light = Wavelength × frequency

c = λν

Step 1: Define

c = 3.0 × 10⁸ m/s

λ = unknown

ν = 1 × 10²⁰ Hz

Step 2: Substitute and Evaluate for λ

3.0 × 10⁸ m/s = λ · 1 × 10²⁰ Hz

λ = 3.0 × 10⁸ m/s ÷ 1 × 10²⁰ Hz

λ  = 3.0 × 10⁻¹² m

The percentage yield of zirconium is 90%.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

The given balanced chemical equation

ZrCl₄ + 2Mg → Zr + 2MgCl₂

Number of moles =  \(\frac{\text{Given mass}}{\text{Molar mass}}\)

                             = \(\frac{58.3}{233.2}\)

                             = \(\frac{1}{4}\) mole

Theoretical yield mass of Zr = \(\frac{1}{4} \times 91.2\)

                                               = 22.8 g

To find the percentage yield use this formula

% yield = \(\frac{\text{Actual yield}}{\text{Theoretical yield}} \times 100\%\)

            = \(\frac{20.52}{22.80} \times 100\%\)

            = 90 %

Thus from the above conclusion we can say that the percentage

yield of zirconium is 90%.

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The primary difference between measuring with a graduated cylinder and a volumetric pipette lies in their accuracy, precision, and purpose.

A graduated cylinder is a cylindrical glassware marked with evenly spaced graduation lines, which allow for the measurement of various volumes of liquid. Graduated cylinders are commonly used in laboratories for obtaining a relatively accurate measurement of liquid volumes.

On the other hand, a volumetric pipette is a slender, elongated glassware with a single graduation mark, designed to precisely measure and transfer a specific volume of liquid. Volumetric pipettes are utilized when a high degree of accuracy and precision is required, such as in analytical chemistry and quantitative analysis.

While both instruments measure liquid volume, graduated cylinders offer a broader range of measurements, making them more versatile. However, volumetric pipettes provide a higher degree of accuracy and precision due to their specific calibration. Consequently, the choice between using a graduated cylinder or a volumetric pipette depends on the degree of precision needed for a particular experiment or task.

In summary, graduated cylinders are suitable for general liquid volume measurements with moderate accuracy, while volumetric pipettes cater to precise measurements requiring a higher level of accuracy and consistency.

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Answer: compound

Explanation: i’m right.

A) CaCl2

Calcium chloride is an inorganic compound, a salt with the chemical formula CaCl2. It is a colorless crystalline solid at room temperature, highly soluble in water.

The reaction has not yet started, and the time required for 16.8% of the reactant to remain cannot be calculated using the given rate constant.

Given,The rate constant for this first-order reaction is 0.0830 s−1 at 400 ∘C.A⟶products After how many seconds will 16.8% of the reactant remain-The time taken for a first-order reaction to reach a particular percentage of completion can be calculated using the following formula:t = (ln(A/A₀))/kwhere A₀ is the initial concentration of the reactant, A is the concentration of the reactant at a given time, k is the rate constant, and t is the time elapsed since the reaction began.In this question, we are given the rate constant, k = 0.0830 s−1 at 400 ∘C, and we want to find out the time required for 16.8% of the reactant to remain.Let's assume that the initial concentration of the reactant is 100 units (we can assume any value as it does not affect the percentage of completion).Therefore, the concentration of the reactant remaining after 16.8% of completion would be: A = 16.8 units.Substituting these values in the above formula, we get:t = (ln(16.8/100))/0.0830t = (−1.7918)/0.0830t = −21.58 sThis time value is negative, which means that the reaction has not even started yet. Therefore, we need to check the given percentage of completion.

If it is less than 50%, we can assume that the reaction has not yet started. In this case, the percentage of completion is 16.8%, which is less than 50%.

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In an experiment to study the formation of HI (g), H2 (g) + I2 (g) → 2HI (g), H2 (g) and I2 (g) were placed in a sealed container and allowed to react. On one set of axes, the concentration vs time curves for H2 and HI would look like a parabola, where the highest concentration of the reactants are at the beginning, and gradually decline as the reaction reaches equilibrium. The concept of dynamic equilibrium is that the rates of the forward and reverse reaction are equal, and the concentrations of the products and reactants remain constant.

Dynamic equilibrium is a state of a chemical system in which the rate of the forward reaction is equal to the rate of the reverse reaction. In this state, the concentrations of reactants and products remain constant over time as they continue to react with each other. The system does not appear to be changing since the forward and backward reactions occur at the same rate.

The formation of HI(g) from H2(g) and I2(g) represents a reversible reaction. Initially, the concentration of H2(g) is high and the concentration of HI(g) is zero. As the reaction proceeds, the concentration of H2(g) decreases while the concentration of HI(g) increases. Once the system reaches dynamic equilibrium, the concentration of both H2(g) and HI(g) remains constant.

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Lithium has lowest electronegativity value.

The propensity of an atom of a certain chemical element to draw sharing electrons while forming a chemical bond was known as electronegativity and was denoted by the symbol. The atomic number and the separation of the valence electrons from the charged nucleus have an impact on an atom's electronegativity.

It is known that on moving toward the period in the periodic table electronegativity rapidly increases and decreases  toward the group. So, lithium will have least  electronegativity value than beryllium, boron, carbon, and nitrogen

Therefore, Lithium has lowest electronegativity value.

Hence, the correct answer will be option (a).

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When the engineer adds an additional 1.2 atm of nitrogen dioxide, the total pressure of the mixture is 4.9 atm + 1.2 atm = 6.1 atm. At equilibrium, the pressure of dinitrogen tetroxide is approximately 2.3 atm.

This is calculated by subtracting the equilibrium pressure of nitrogen dioxide (2.7 atm) from the total pressure of the system (6.1 atm). Therefore, after equilibrium is reached the second time, the pressure of dinitrogen tetroxide is 2.3 atm.

When nitrogen dioxide gas is added to a system, the equilibrium pressure of dinitrogen tetroxide is determined by Le Chatelier's principle. This principle states that when a system is disturbed from equilibrium, it will shift to re-establish equilibrium.

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Answer:

Pressure, volume and temperature

Explanation:

Ideal gas law

\(\boxed{pV=nRT}\)

where

p= pressure,

V= volume,

n= number of moles,

R= universal gas constant

T= temperature

_____

The ideal gas law is made up of the 4 laws below:

1) Avogadro's law

• The volume of a sample of gas is directly proportional to the number of moles of gas in the sample at constant temperature and pressure

• V∝ n

2) Boyle's law

• The volume of a fixed mass of gas is inversely proportional to its pressure at constant temperature

• p∝ 1/V

3) Charles' Law

• The volume of gas is directly proportional to its absolute temperature at constant pressure

• V∝ T

4) Gay-Lussac's Law

• The pressure of gas is directly proportional to its absolute temperature at constant volume

• p∝ T

Electronegativity decreases because the valence electrons are farther from the nucleus. Hence, option C is correct.

Electronegativity is a chemical property that describes the tendency of an atom or a functional group to attract electrons toward itself.

From top to bottom down a group, electronegativity decreases. This is because atomic number increases down a group, and thus there is an increased distance between the valence electrons and nucleus, or a greater atomic radius.

Important exceptions to the above rules include the noble gases, lanthanides, and actinides.

Electronegativity decreases because the valence electrons are farther from the nucleus. Hence, option C is correct.

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