agree or disagree that a scientific theory can be modified provide evidence along!!!!!!!

The absorbance value at a selected wavelength for the absorbance spectra of each of the solutions can be determined by using Beer's law.

What is Beer's law?

According to Beer's rule, the absorbance is inversely proportional to the concentration of the absorbing substance at constant route length. When an is a constant that depends on the medium, the absorbing substance, and the light's wavelength, and b is the path length, C is the concentration (solvent and other components).

The absorbance value for each spectrum is calculated at a certain wavelength. In general, it is desirable to choose a wavelength where the absorbance is at its highest because this will reduce the measurement's relative inaccuracy. The next step is to create a Beer's Law plot showing absorbance vs. concentration.

Hence using the Beer's law we can easily calculate the absorbance value at a selected wavelength for the absorbance spectra of each of the solutions that we prepare.

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The volume of 0.175M sodium sulfate solution that is necessary to completely react with 35.0 mL of 0.112M silver nitrate is 22.4mL.

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

The volume of a solution can be calculated using the following expression:

CaVa = CbVb

Where;

According to this question, 0.175M sodium sulfate solution completely reacts with 35.0 mL of 0.112M silver nitrate. The volume required for this reaction to occur can be calculated as follows:

0.175 × Va = 35 × 0.112

0.175Va = 3.92

Va = 3.92/0.175

Va = 22.4mL

Therefore, 22.4mL is the volume of the sodium sulfate needed.

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When 192 g of magnesium reacts with hydrochloric acid, approximately 15.98 g of hydrogen gas is produced

To answer this reacting mass question, you'll need to follow these steps:
1. Write down the balanced chemical equation:
Mg + 2 HCl → MgCl₂ + H₂
2. Determine the molar mass of magnesium (Mg) and hydrogen gas (H₂):
Mg: 24.31 g/mol (from periodic table)
H₂: 2.02 g/mol (1.01 g/mol for each H atom * 2)
3. Calculate the number of moles of magnesium (n_Mg) in 192 g of magnesium:
\frac{n_Mg = mass }{ molar mass} = \frac{192 g }{ 24.31 g/mol} ≈ 7.90 mol
4. Use the stoichiometry of the balanced equation to find the number of moles of hydrogen gas (n_H₂) produced:
1 mol Mg reacts with 1 mol H₂ (from the balanced equation)
n_H₂ = n_Mg = 7.90 mol
5. Calculate the mass of hydrogen gas (m_H₂) produced:
m_H₂ = n_H₂ * molar mass = 7.90 mol * 2.02 g/mol ≈ 15.98 g
Thus, when 192 g of magnesium reacts with hydrochloric acid, approximately 15.98 g of hydrogen gas is produced.

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Hydrogen gas is created Hydrogen gas is created when 192 g of magnesium interacts with 15.98 g of hydrochloric acid.

You must take the following actions in order to respond to this reactive mass question:

1. Compose the following chemical equation in full:

\(Mg + 2 HCl \rightarrow MgCl_2 + H_2\)

2. Calculate the molar mass of hydrogen gas (H2) and magnesium (Mg):

24.31 g/mol for Mg (per the periodic table)

(1.01 g/mol for each H atom * 2): H2: 2.02 g/mol

3. Determine how many moles of magnesium (n_Mg) there are in 192 g of magnesium.

\(\frac{n_Mg = mass }{ molar mass} = \frac{192 g }{ 24.31 g/mol} = 7.90 mol\)

4.Find the quantity of hydrogen gas (n_H2) created using the balanced equation's stoichiometry:

According to the balanced equation, 1 mol Mg and 1 mol H2 react.

n_H₂ = n_Mg = 7.90 mol

5. Calculate the mass of generated hydrogen gas (m_H_2):

\(m_H_{2} = n_H_{2 }* molar mass = 7.90 mol * 2.02 g/mol = 15.98 g\)

Thus, 15.98 g of hydrogen gas are created when 192 g of magnesium react with hydrochloric acid.

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Answer:

Element A and element D

Please make me brainliest!!

Answer: 3.55g Na2SO4

Explanation:

we need to find how many moles of Na2SO4 we have:

0.250Lx0.10M= 0.025 moles of Na2SO4

now multiply that by the molar mass of Na2SO4 (142.04g/mol)

0.025mol x 142.04g/mol = 3.55g Na2SO4

The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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The statements which is true about the reactants from the given simulation above is: It involves the breaking of chemical bonds.

The correct answer choice is option c

For a chemical reaction to occur, the bond between the reacting substances breaks either by covalent or electrovalent bonding in order to form new substance.

So therefore, reactants usually break chemical bonds duringchemical reaction.

Complete question:

A chemical reaction causes the chemical compositions of substances to change. Reactants are substances that enter into a reaction, and products are substances produced by the reaction

Which of the following are the reactants for this simulation? Select all that apply

a. A chemical reaction results to formation of new bonds

b. A chemical reaction involves the formation of new substance.

c. It involves the breaking of chemical bonds

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Answer:

The answer is wave

Explanation:

Answer:

Amount left after 140 days is 38.125 g.

Explanation:

Given data:

Half life of Co-59 = 35 days

Total mass of sample = 610.0 g

Sample remain after 140 days = ?

Solution:

Number of half lives passes during 140 days:

Number of half lives  = T elapsed / Half lives

Number of half lives  = 140 days / 35 days

Number of half lives  = 4

Amount left:

At time zero = 610 g

At first half life = 610 g/2 = 305 g

At second half life = 305 g/2 = 152.5 g

At 3rd half life = 152.5 g/2 = 76.25 g

At 4th half life = 76.25 g /2 =38.125 g

Amount left after 140 days is 38.125 g.

Answer:

2.5 moles of oxygen = x

1 Faraday =9600

cross multiply and then divide by the coefficient of the unknown

Explanation:

sorry am not with my calculator

Answer: 3.75

Explanation:

At 35°C, the value of Kw (the ionic product of water) is 1.16 x 10^-14.

The pH of a solution is determined by the concentration of hydrogen ions (H+) in the solution. The pH of a 0.10 M NaOH solution at 35°C is 12.68. The pH of a solution is related to the ionic product of water (Kw), which is defined as the product of the concentrations of the hydrogen (H+) and hydroxide (OH-) ions in the solution. At 35°C, the value of Kw is 1.16 x 10^-14.

At 35°C, the value of Kw (the ionic product of water) is 1.16 x 10^-14.

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Answer:

Valence electrons are the electrons orbiting the nucleus in the outermost atomic shell of an atom. Electrons that are closer to the nucleus are in filled orbitals and are called core electrons

Explanation:

yup

Answer:

Molar mass of H3PO4  = 97.99 g/mol (Approx.)

Explanation:

Find:

Molar mass of H3PO4

Given;

Molar mass of H = 1.0079 g/mol

Molar mass of P = 30.974 g/mol

Molar mass of O = 15.999 g/mol

Computation:

Molar mass of H3PO4  = (1.0079)(3) + 30.974 + 15.999(4)

Molar mass of H3PO4  = 3.0237 + 30.974 + 63.996

Molar mass of H3PO4  = 97.9937

Molar mass of H3PO4  = 97.99 g/mol (Approx.)

Answer:

The above answer is correct

Explanation:

I took the test

In Science, went to atom slam together to form a heavier atom this phenomena is called fusion.

Went two atoms slam together to form a heavier item this process is called nuclear fusion in science.

When they are to unstable atoms they combine with each other in order to form a stable atom that is much more heavier.

In the process of recombination energy is released by the items which can be given by the mass energy equivalence,

E = ∆mc²

Where,

∆m is the change in mass during the recombination and c is the speed of light.

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Answer:

The B. Is perfect match of a definition of chemical property.

Explanation:

The ability of gunpowder to explode.

The ability of gunpowder to explode is the best definition of a chemical property.

The change of one type of matter into another type of matter and inability to change into the previous forms is called a chemical property. Examples of chemical properties include reactivity and heat of combustion.

So we can conclude that the ability of gunpowder to explode is the best definition of a chemical property.

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Constitutional isomerism is a type of isomerism in which molecules have the same atoms, but the order in which the atoms are bonded is different. They can have the same molecular formula but different functional groups

The members of the following set of compounds are all alcohols:

2-Butanol

3-Methyl-1-pentanol

2-Methyl-2-butanol

Pentan-1-ol

2-Methyl-1-butanol

1-Pentanol

Therefore, we must recognize the structural formula that represents the same compound and the one that represents constitutional isomers of each other.The constitutional isomers are

2-Methyl-1-butanol, 3-Methyl-1-pentanol, and 2-Methyl-2-butanol.

The following two pairs of alcohols represent the same compound:

2-Butanol and Pentan-1-ol.

Their structural formulas contain five carbon atoms.

1-Pentanol and 3-Methyl-1-pentanol. They contain five carbon atoms and are primary alcohols as well.Each alcohol has its own unique structural formula that separates it from other compounds. Isomers are compounds that have the same chemical formula but differ in structure, and this includes constitutional isomers.Therefore, the structural formulas that represent the same compound are Pentan-1-ol and 2-Butanol. The structural formulas that represent constitutional isomers are 2-Methyl-1-butanol, 3-Methyl-1-pentanol, and 2-Methyl-2-butanol.

Constitutional isomers are compounds that have the same number and kind of atoms, but the atoms are connected differently.

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If CO2 is being produced in the solution at a faster rate than H2CO3, then the rate of the decomposition reaction is faster than the rate of the formation reaction. This means that more CO2 is being produced from the breakdown of H2CO3 than H2CO3 is being formed from the combination of CO2 and water.

This could be due to various factors such as changes in temperature or pressure, addition of catalysts or reactants, or changes in the concentration of reactants. Understanding the rates of these reactions is important in fields such as chemistry, biology, and environmental science as they play a crucial role in many natural and industrial processes.

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Sample A, with an activity of 6,500 Bq, has a higher activity and therefore produces a greater amount of radiation compared to Sample B, which has an activity of 92.5 Bq.

Radioisotopes are radioactive elements with unstable nuclei that undergo radioactive decay to achieve stability. During this process, radioisotopes emit radiation. Radiation refers to the energy emitted by a radioactive source. The type of radiation emitted during decay includes alpha particles, beta particles, and gamma rays.

The measure of the radiation produced by a radioisotope is known as its activity, which is quantified in units of Becquerel (Bq) or Curie (Ci). One Bq represents one decay per second, while one Ci corresponds to 3.7 x 10^10 decays per second. Thus, 1 Ci equals 3.7 x 10^10 Bq.

For example, Sample A has an activity of 6.5 kBq, which is equivalent to 6,500 Bq since one kiloBecquerel (kBq) equals 1,000 Becquerel (Bq). On the other hand, Sample B has an activity of 2.5 μCi, which is equivalent to 92.5 Bq since one microCurie (μCi) equals 37,000 Bq.

Consequently, Sample A exhibits a higher activity level than Sample B. In other words, Sample A produces a greater amount of radiation compared to Sample B.

To summarize, radioisotopes undergo radioactive decay and emit radiation, which is measured by their activity in units of Becquerel or Curie. Sample A, with an activity of 6,500 Bq, has a higher activity and therefore produces a greater amount of radiation compared to Sample B, which has an activity of 92.5 Bq.

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Answer:

Br^-1

Explanation:

It is an ion that gained an extra electron making it 36 electrons but the other. one is in the neutral state with 35 electrons

Answer: The four ions formed are \(H^+\) , \(OH^-\) , \(Na^+\) and \(Cl^-\)

Explanation:

Electrolysis is the process where electricity is used to drive chemical reactions.

In the electrolysis of aqueous solution of sodium chloride, hydrogen gas produces at the cathode which is a negative electrode and chlorine gas produces as the anode which is a positive electrode and the sodium hydroxide remains dissolved in the solution.

The reactions will be :

\(NaCl\rightarrow Na^++Cl^-\)

\(H_2O\rightarrow H^++OH^-\)

Hence, electrolysis of an aqueous solution of sodium chloride lead to the formation of four ions,\(H^+\) , \(OH^-\) , \(Na^+\) and \(Cl^-\)

The value of Kc for this equilibrium mixture is 0.8889.The equilibrium constant, Kc, is a measure of the concentrations of reactants and products in an equilibrium mixture. The balanced equation for the reaction is: N2 + 3H2 ⇌ 2NH3.

Using the given moles, we can calculate the molar concentrations of the reactants and products: [NH3] = 0.400 moles / 2.0 L = 0.200 M [N2] = 0.200 moles / 2.0 L = 0.100 M [H2] = 0.300 moles / 2.0 L = 0.150 M.

Now, we can calculate Kc using the formula: Kc = ([NH3]^2) / ([N2] * [H2]^3). Plugging in the values, we get: Kc = (0.200^2) / (0.100 * 0.150^3) = 0.8889. Therefore, the value of Kc for this equilibrium mixture is 0.8889.

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Answer:

Addition

Explanation:edg 2020

Answer:

The correct answer is A.

Explanation:

Edge 2022

Answer:

Because heat flows from warmer objects to cooler objects

Explanation:

Answer:

Simple distillation for salt and water

Explanation:

#O_2

\(\\ \sf\longmapsto No\:of\;moles=\dfrac{Given\:mass}{Molar\:mass}\)

\(\\ \sf\longmapsto No\:of\:moles=\dfrac{31.99}{32}\)

\(\\ \sf\longmapsto No\:of\:moles\approx 1\)

#NaCl

\(\\ \sf\longmapsto No\:of\:moles=\dfrac{176.8}{58.5}\)

\(\\ \sf\longmapsto No\;of\:moles=3mol\)