(5 x 10 4) + (2.5 x 10 2) =
2 x 10 2
12.5 x 10 2
0.5 x 10 6
5 x 106

The preparation of bases involves several methods that are used to create substances with basic or alkaline properties are Reaction of metal with water, Reaction of metal oxide with water, Neutralization reaction, Ammonia gas dissolving in water and Partial neutralization of a strong base with a weak acid.

Reaction of metal with water: Certain metals, such as sodium or potassium, react with water to form hydroxides. For example, sodium reacts with water to produce sodium hydroxide (NaOH).

Reaction of metal oxide with water: Metal oxides, such as calcium oxide (CaO) or magnesium oxide (MgO), can be added to water to form metal hydroxides. This process is known as hydration. For instance, when calcium oxide reacts with water, it forms calcium hydroxide (Ca(OH)2).

Neutralization reaction: Bases can be prepared by neutralizing an acid with an appropriate alkaline substance. This involves combining an acid with a base to form water and a salt. For example, mixing hydrochloric acid (HCl) with sodium hydroxide (NaOH) results in the formation of water and sodium chloride (NaCl).

Ammonia gas dissolving in water: Ammonia gas (NH3) can dissolve in water to form ammonium hydroxide (NH4OH), which is a weak base.

Partial neutralization of a strong base with a weak acid: Mixing a strong base, such as sodium hydroxide (NaOH), with a weak acid, like acetic acid (CH3COOH), results in the formation of a base with a lesser degree of alkalinity.

These methods are utilized in laboratories, industries, and various applications where bases are required, such as in the production of cleaning agents, pharmaceuticals, and chemical reactions. Each method has its own advantages and specific applications depending on the desired base and its properties.

The question was incomplete. find the full content below:

What are the various methods involved in the preparation of bases?

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a sponge because it lets in some of the dirt and mess but it doesn't let in all of it as in a shovel doesn't really take in anything

A sponge has selective permeability, while a shovel does not. Selective permeability refers to the ability of a material or membrane to allow certain substances to pass through while restricting the passage of others.

In the case of a sponge, it has a porous structure with small openings that can absorb and hold liquids, while allowing water to pass through. This selective permeability enables a sponge to soak up and retain liquids while filtering out larger particles.

A shovel is typically made of solid materials like metal or plastic, which do not possess selective permeability. A shovel's main purpose is to scoop and transport materials such as soil, sand, or snow, but it does not have the ability to selectively allow substances to pass through its structure.

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Answer:

Of course the answer is gold

Explanation:

Gold is used for making jewellery and not aluminium,iron or copper

Answer:

copper or gold.

Explanation:

Copper is also a good material for accessories. Even in the ancient times, those who can’t afford gold jewelry wear copper jewelry instead. It offers design flexibility too due to its high ductility.

Brainly is erroneously blocking my answer from being posted due to nonexistent profanity and/or links, so I have attached an image of my written response. Please let me know if you have any problems seeing it.

Answer:

B. 0.55 M

Explanation:

Step 1: Given data

Step 2: Calculate the molarity of the aqueous solution

The molarity is a way to express the concentration of a solution. It is equal to the quotient between the moles of solute and the liters of solution.

M = moles of solute / liters of solution

M = 1.5 mol / 2.75 L = 0.55 mol/L = 0.55 M

The charge qₑₙ contained within the Gaussian cylinder is equal to the net charge enclosed by the cylinder.

In the context of Gauss's Law in electromagnetism, a Gaussian cylinder is an imaginary surface used to apply the law. Gauss's Law states that the electric flux through a closed surface is proportional to the net charge enclosed by that surface.

The charge qₑₙ enclosed within the Gaussian cylinder can be determined by calculating the integral of the electric field over the surface of the cylinder. This integral represents the electric flux passing through the surface, which is proportional to the net charge enclosed.

To find the value of qₑₙ, you need to evaluate the integral of the electric field over the surface of the Gaussian cylinder. The result will be the net charge enclosed by the cylinder.

By using Gauss's Law and properly considering the symmetry and characteristics of the electric field, you can determine the charge qₑₙ enclosed within the Gaussian cylinder for a given distribution of charges.

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the amount of energy absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure, is formed.

According to Avogadro's law 1 mole of any gas occupies 22.4 L (dm3) at room temperature and pressure.

So the amount of energy absorbed:

(kJ)E=131∗240/22.4

=1403.6(kJ)

1403.6 kJ is absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure is formed.

ATP is chemically related MOST closely to which of the following is glucose. Option(A) .

ATP (adenosine triphosphate) is chemically related most closely to glucose. Glucose is a monosaccharide and serves as the primary fuel source for cellular energy production. Through cellular respiration, glucose is broken down to produce ATP, which is a high-energy molecule that stores and provides energy for various cellular processes.

The process of glycolysis converts glucose into ATP, making glucose the initial source of energy for ATP synthesis. In contrast, phospholipids, testosterone, guanine, and tryptophan are not directly involved in the production or storage of ATP.

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Before its activity is lowered to 16.0 mci, it will take 47 days. A medical supply store buys a radioactive isotope sample with a 172.0-mci sample. The term "radioisotope" refers to an element's radioactive form.

which consists of atoms with unstable nuclei that undergo radioactive decay to stable forms, producing distinctive alpha, beta, or gamma radiation. Radioisotopes are an element's radioactive isotopes. They are the atoms with unstable neutron-proton combinations or excess energy in their nuclei. During those processes, the radionuclide is said to experience radioactive decay, albeit the surplus energy may be put to use in any number of ways. one of two or more atoms with a nuclear makeup that has a different amount of neutrons than protons but the same number of protons overall.

t = - ln(R/Ro)/lamda

t = -14 (ln(16/172)/ln2

t = 47 days.

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If the dialysis tubing contained distilled water, then there would be no net movement of water across the tubing.

This is because distilled water is pure water with no solutes, and dialysis works through the process of diffusion, in which water moves from an area of high concentration to an area of low concentration.

In the case of dialysis tubing containing distilled water, there would be an equal concentration of water on both sides of the tubing, and therefore no net movement of water. This means that the dialysis tubing would not change in size or shape, and there would be no change in the concentration of solutes on either side of the tubing.

In contrast, if the dialysis tubing contained a solution with a higher concentration of solutes than the surrounding solution, then water would move into the tubing, causing it to expand. Conversely, if the dialysis tubing contained a solution with a lower concentration of solutes than the surrounding solution, then water would move out of the tubing, causing it to shrink.

Overall, the presence of distilled water in the dialysis tubing would result in no net movement of water across the tubing, and no change in the size or shape of the tubing

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the pH of a 0.019 M aqueous solution of pyridine is 0.95. The solution can be solved by using the relation of the basic equilibrium constant and the expression for the base dissociation constant.  

Here is the solution to the problem:Given information;The base dissociation constant (Kb) = 1.7 × 10-9Concentration of pyridine (C5H5N) in solution = 0.019 MThe expression for the dissociation constant of a base in terms of the concentration of its conjugate acid is as follows:Kb = [BH⁺][OH⁻]/[B]where BH⁺ is the conjugate acid of the base B and OH⁻ is the hydroxide ion. In this case, pyridine (C5H5N) acts as a base and the reaction with water can be represented as follows:C5H5N(aq) + H2O(l) ⇌ C5H5NH⁺(aq) + OH⁻(aq)The equilibrium expression for the dissociation of pyridine is:Kb = [C5H5NH⁺][OH⁻]/[C5H5N]The equilibrium concentration of the hydroxide ion can be calculated using the Kb and the concentration of pyridine in solution. Since the concentration of the hydroxide ion is equal to the concentration of the conjugate acid (C5H5NH⁺), we can write:Kb = [OH⁻][C5H5NH⁺]/[C5H5N][OH⁻] = Kb[C5H5N]/[C5H5NH⁺] = (1.7 × 10⁻⁹)(0.019)/[C5H5NH⁺]Rearranging the above equation gives the concentration of the conjugate acid [C5H5NH⁺]:[C5H5NH⁺] = (1.7 × 10⁻⁹)(0.019)/[OH⁻]The pH can then be calculated using the concentration of the conjugate acid and the concentration of the base:[OH⁻] = [C5H5N] = 0.019 M[C5H5NH⁺] = (1.7 × 10⁻⁹)(0.019)/[OH⁻]pH = pKa + log([C5H5NH⁺]/[C5H5N])pH = 9.72 + log[(1.7 × 10⁻⁹)(0.019)/0.019]pH = 9.72 + log(1.7 × 10⁻⁹)pH = 9.72 - 8.77pH = 0.95

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Answer:

A conjugate acid, within the Brønsted–Lowry acid–base theory, is a chemical compound formed when an acid donates a proton to a base—in other words, it is a base with a hydrogen ion added to it, as in the reverse reaction it loses a hydrogen ion

Explanation:

According to the A.P.E.X. glossary:

A conjugate acid is the form a base takes after it gains a hydrogen ion (or proton), and a conjugate base is the form an acid takes after it loses a hydrogen atom (or proton).

since you  have  Sulphur dioxide in the experiment    . Use Charles' Law,  to know the volume \(V 1 /T 1 = V 2/ T 2\)

what is the volume of the gas ?

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0.84 moles of phosphoric acid are required to produce 1000 cans of Coca-Cola Classic.

1.26 moles of carbon dioxide are required to produce 1000 cans of Coca-Cola Classic.

The balanced chemical equation for the reaction between caffeine, phosphoric acid, and other ingredients to produce Coca-Cola Classic can be written as:

C8H10N4O2 + 4 H3PO4 + 6 CO2 + other ingredients → C6H5CO2K + other products

From the equation, we can see that 4 moles of H3PO4 are required for every 1 mole of caffeine used. Therefore, if 0.21 moles of caffeine are used to produce 1000 cans of Coca-Cola Classic, the number of moles of phosphoric acid required can be calculated as follows:

0.21 moles caffeine × 4 moles H3PO4/1 mole caffeine = 0.84 moles H3PO4

Therefore, 0.84 moles of phosphoric acid are required to produce 1000 cans of Coca-Cola Classic.

The equation also shows that 6 moles of CO2 are produced for every 1 mole of caffeine used. Therefore, the number of moles of carbon dioxide required can be calculated as follows:

0.21 moles caffeine × 6 moles CO2/1 mole caffeine = 1.26 moles CO2

Therefore, 1.26 moles of carbon dioxide are required to produce 1000 cans of Coca-Cola Classic.

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The number of moles of HCl produces 400.0 mL of 1.5M MgCl₂ is equal to 1.20 moles. Therefore, option (C) is correct.

A mole can be defined as a standard unit that is used to find a huge number of quantities of molecules, atoms, ions, or other particular particles.

The number of entities in one mole was found to be equal to 6.023 × 10²³ which is called Avogadro’s constant.

The chemical equation of magnesium and HCl is:

Mg (s) + 2HCl (aq) →  MgCl₂ (aq)  +  H₂(g)

The volume of the MgCl₂ solution, V = 400 ml = 0.4 L

The concentration of MgCl₂ = 1.5 M

The number of moles of MgCl₂ = 1.5 × 0.4 = 0.6 moles

One mole of MgCl₂ is produced from HCl = 2

0.6 moles of MgCl₂ is produced from HCl = 2 × 0.6 = 1.20 moles

Therefore, 1.20 moles of HCl will be reacted to produce 0.6 moles of MgCl₂.

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Answer:

Workplace Hazardous Materials Information System

WHMIS is a short form for Workplace Hazardous Materials Information System. It is a comprehensive plan for providing information on the safe use of hazardous materials used in Canadian workplaces. Information is provided by means of product labels, material safety data sheets (MSDS) and worker education programs.

Answer:

Workplace Hazardous Materials Information System

Explanation:

Answer:

The correct answer is the third option.

Explanation:

\(2NBr_3 + 3NaOH\rightarrow N_2 + 3NaBr + 3HOBr\)

Moles of nitrogen tribromide = 40 mol

Moles of sodium hydroxide = 48 mol

According to reaction, 2 moles of nitrogen tribromide reacts with 3 moles of sodium hydroxide, then 40 mol of nitrogen tribromide will react with:

\(=\frac{3}{2}\times 40 mol=60 \text{mol of NaOH}\)

This means that in order to completely react with 40 moles of nitrogen tribromide we will need 60 moles of sodium hydroxide.

But according to the question we only have 48 moles of sodium hydroxide which is less than the 60 moles of sodium hydroxide which indicates that sodium hydroxide is present in a limited amount and nitrogen tribromide is present in an excess amount.

So, the limiting reagent is sodium hydroxide, hence the correct answer is the third option.

The specific heat of the metal is approximately 0.124 J/g°C.

To find the specific heat of the metal, we can use the equation: q = mcΔT

where q is the heat transferred, m is the mass of the metal, c is the specific heat capacity of the metal, and ΔT is the change in temperature.

First, let's calculate the heat transferred to the water using the equation: q_water = mc_waterΔT_water

Given: mass of water (m_water) = 65.0 g specific heat capacity of water (c_water) = 4.18 J/g°C

change in temperature of water (ΔT_water) = 28.2°C - 19.3°C = 8.9°C

Plugging in the values:

q_water = (65.0 g)(4.18 J/g°C)(8.9°C)

q_water = 2501.85 J

Since the heat lost by the metal is equal to the heat gained by the water, we have: q_water = q_metal

Therefore, q_metal = 2501.85 J

Now, let's calculate the mass of the metal: mass of metal (m_metal) = 203.77 g

Finally, we can find the specific heat of the metal by rearranging the equation: c_metal = q_metal / (m_metalΔT_metal)

Given: change in temperature of metal (ΔT_metal) = 98.2°C

Plugging in the values:

c_metal = 2501.85 J / (203.77 g)(98.2°C)

c_metal ≈ 0.124 J/g°C

Therefore, the specific heat of the metal is approximately 0.124 J/g°C.

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The most accurate temperature range within which most corals can survive is from 3 to 4 degrees Celsius.

To determine the temperature range within which most corals can survive, we can analyze the given options:

1 to 2 degrees Celsius

2 to 3 degrees Celsius

3 to 4 degrees Celsius

4 to 5 degrees Celsius

To make a step-by-step explanation, we need to consider the habitat of corals. They are typically found in tropical and subtropical regions where the water temperatures are warm.

Based on this information, we can eliminate options 1) 1 to 2 degrees Celsius and 4) 4 to 5 degrees Celsius as these ranges are either too cold or too warm for coral survival.

Now, we are left with options 2) 2 to 3 degrees Celsius and 3) 3 to 4 degrees Celsius.

Considering the typical temperature conditions in coral reef ecosystems, the range that aligns with their survival is option 3) 3 to 4 degrees Celsius.

Therefore, the most accurate temperature range within which most corals can survive is from 3 to 4 degrees Celsius.

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The equilibrium concentrations of the substances in the reaction A+B ->C+D is Keq = [C]x[D]/0.450 x 1.00.

Equilibrium is a state of balance between opposing forces. It occurs when two forces are equal and opposite in direction and magnitude, so that no net force exists. This can be seen in physical, chemical, and economic systems. In physical systems, equilibrium occurs when the total energy of the system is at a minimum or maximum, or when the forces in a system are balanced.

The equilibrium concentrations of the substances in the reaction A+B ->C+D can be determined by using the equilibrium expression. The equilibrium expression is given by:

K_eq = [C]x[D]/[A]x[B]

Since we know that the equilibrium concentration of A is 0.450 mol/L, and the initial concentrations of A and B are both 1.00 mol/L, we can solve for the equilibrium concentrations of the other substances using the equilibrium expression.

K_eq = [C]x[D]/0.450 x 1.00

K_eq = [C]x[D]/0.450

The equilibrium concentrations of the other substances can then be calculated by rearranging the equations.

[C] = K_eq x 0.450/[D]

[D] = K_eq x 0.450/[C]

The equilibrium constant, Keq, can then be solved for by substituting the equilibrium concentrations of C and D into the equilibrium expression.

K_eq = [C]x[D]/0.450 x 1.00

K_eq = [C]x[D]/0.450

Therefore, the equilibrium concentrations of C and D can be determined by substituting the value of Keq into the equations above.

[C] = K_eq x 0.450/[D]

[D] = K_eq x 0.450/[C]

The equilibrium constant, Keq, is equal to the product of the equilibrium concentrations of C and D divided by the initial concentrations of A and B.

Keq = [C]x[D]/0.450 x 1.00

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Answer:

A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. Chemical changes occur through the process of chemical reactions, and the resulting substances have different properties because their atoms and molecules are arranged differently.

Explanation:

A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. Chemical changes occur through the process of chemical reactions, and the resulting substances have different properties because their atoms and molecules are arranged differently.

a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change. Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

To identify whether a chemical shift has taken place or not, the boiling point of sugar must be known.

Which is a chemical change ?

A chemical change occurs when one chemical substance is changed into one or more distinct chemicals, like when iron is changed into rust. Chemical changes are brought about by the process of chemical reactions, and the substances that are produced have varied qualities because of the diverse ways that their atoms and molecules are structured.

If sugar is dissolved in water in a glass, we can evaporate the water to return to the solid sugar inside the container. This is a phase transition, which is a physical alteration. A phase change occurs when the new substance's condition or form changes.

In the beaker, sugar will re-crystallize at a significantly higher temperature of roughly 320°F rather than boiling. The water in the beaker will eventually reach its boiling point as the temperature rises and begin to evaporate as steam. In the meantime, the bottom of the solution will start to crystallize again with the sugar.

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To calculate the percentage yield in this experiment, we first need to understand what is happening. The reaction between aluminum metal and sulfuric acid produces aluminum sulfate, also known as alum. The balanced chemical equation for this reaction is:

2Al + 3H2SO4 → Al2(SO4)3 + 3H2

From this equation, we can see that 2 moles of aluminum produce 1 mole of aluminum sulfate. The molar mass of aluminum is 26.98 g/mol, and the molar mass of aluminum sulfate is 342.15 g/mol.

Using these values, we can calculate the theoretical yield of aluminum sulfate from 0.94 g of aluminum:

0.94 g Al x (1 mol Al / 26.98 g Al) x (1 mol Al2(SO4)3 / 2 mol Al) x (342.15 g Al2(SO4)3 / 1 mol Al2(SO4)3) = 6.38 g Al2(SO4)3

So the theoretical yield of alum is 6.38 g. However, the actual yield in the experiment was 9.4 g. To calculate the percentage yield, we use the formula:

% yield = (actual yield / theoretical yield) x 100

% yield = (9.4 g / 6.38 g) x 100 = 146.9%

The percentage yield is greater than 100%, which is not possible in theory. This could be due to experimental error or impurities in the reactants. It is important to consider all factors when interpreting experimental data.

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The first step in calculating the percentage yield is to determine the theoretical yield, which is the maximum amount of product that can be obtained based on the amount of reactants used. In this case, the reaction between aluminum metal and sulfuric acid to produce alum is a 1:1 molar ratio, meaning that the theoretical yield of alum is 0.94g.

Next, we can calculate the actual yield, which is the amount of product obtained in the experiment. Here, we collected 9.4g of alum.

Finally, we can use the formula for percentage yield: actual yield/theoretical yield x 100%. Plugging in the values we have, we get:

9.4g/0.94g x 100% = 1000%

This means that the percentage yield is greater than 100%, which could be due to experimental errors such as impurities in the reactants or incomplete reaction. It is important to note that a percentage yield greater than 100% is not physically possible, so it is likely that some error occurred in the experiment.

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Answer:

[Au] = 0.171 M

Explanation:

For this question, we assume the rock is 100 % gold.

First of all, we determine the moles of gold

67.3 g . 1mol/ 196.97g = 0.342 moles

Molar concentration is defined as the moles of solute, contained in 1L of solution.

Our solution volume is 2L.

M = 0.342 mol / 2L = 0.171

Molar concentration, also called molarity of solution is the most typical unit of concentration.

Answer:

oppositely charged ions in a chemical compound

Explanation:

Answer:

Between ions

Explanation:

Answer:

Deciduous forests

Explanation:

Explanation:

The barium – 137 cation would have 56 protons, 54 electrons and 81 neutrons.