Phenolphthalein is a weak organic acid, being colorless in an acidic solution and pink (because of the color of its conjugate base) in a basic solution. The Experimental Procedure suggests that the addition of 2 drops of phenolphthalein for the standardization of the sodium hydroxide solution. Explain why the analysis will be less accurate with the addition of a larger amount, e. G. , 20 drops, of phenolphthalein

Answer:

1 not

2 not

3 not

4 balanced

5 not

6 not

7 balanced

Explanation:

the amount of elements must be equal in the reactant and products

The primary intermolecular force responsible  here is london dispersion forces

An intermolecular force is an attractive force that arises between the positive components or also called as  protons  of one molecule and the negative components or  electrons of another molecule. Various physical and also chemical properties of a substance are dependent on this force.

The London dispersion force is a temporary attractive force that generally results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. This force is sometimes called an induced dipole-induced dipole attraction as well

This type of intermolecular force of attraction is generally seen in water and methanol system.

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The remaining amount of sodium-24 from a 160 g sample after a certain time can be calculated using its half-life of 15 hours. we can solve this equation to find the value of 't', which will give us the time required for 5.0 g to remain from the original 160 g sample.

To calculate the remaining amount of sodium-24, we can use the concept of half-life. The half-life of sodium-24 is 15 hours, which means that every 15 hours, the amount of sodium-24 is reduced by half.First, let's determine how many half-lives occur within the given time. We divide the total time by the half-life:Time elapsed = 160 g * (1/2)^(n)where 'n' is the number of half-lives that have occurred. To find 'n', we can use the formula:Time elapsed / Half-life = nIn this case, the time elapsed is not provided, so we'll assume it is 't' hours.Thus, t / 15 = n. Next, we can substitute this value of 'n' back into the initial equation to calculate the remaining amount:5.0 g = 160 g * (1/2)^(t/15). Now, we can solve this equation to find the value of 't', which will give us the time required for 5.0 g to remain from the original 160 g sample.

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Sand was accidentally turned into glass by the Phoenician seafarers by the use of natron.

SiO2 is the primary component of flat glass (silica sand). This has a high melting point of around 1700 degrees Celsius, and in this form it resembles syrup on a very cold day.

Glass composed of borosilicate is a leader in general analytical applications due to its straightforward composition, excellent chemical resistance, and strong thermal shock capabilities. The advantages of borosilicate glass are all present in 96% silica glass, which also has outstanding thermal shock resistance and high service temperature characteristics.

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Le Chatelier's principle states that if a change is made to a system at equilibrium, the system will respond in a way that opposes the change and works to reestablish equilibrium.

This means that if a change is made to the concentration, pressure, or temperature of a system in equilibrium, the equilibrium will shift to compensate for the change.

In the given reaction: N2O4(g) + energy ⇄ 2NO2(g)

An increase in pressure will cause the equilibrium to shift towards the side with fewer gas molecules, which in this case is the reverse reaction (N2O4). This will result in a decrease in the number of gas molecules in the system.

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Answer:

4.  0.5 kilometers (1st option)

5.  0.1 00 liters (last option)

Explanation:

500 meters to kilometers

4.

1 kilometer = 1000 meters

We use the formula SBD (SMALL TO BIG DIVIDE) i hope this helps you

500 ÷ 1000

= 0.5 kilometers

5.

100 milliliter to liter

SBD

100 ÷ 1000

= 0.1 00 liters

The radius of an atom of a chemical element is a measure of the atom's size. The meaning of it is said to be the typical distance, which is from the center of the nucleus to the boundary of the atom, which is surrounding the electrons.

Explanation :

To arrange the following in order of increasing radius: O2-, F-, Ne, Rb, and Br-, follow these steps:

1. Determine the number of protons and electrons for each species.
2. Compare their positions on the periodic table.

Here's a breakdown of the species with their protons and electrons:
- O2-: 8 protons, 10 electrons
- F-: 9 protons, 10 electrons
- Ne: 10 protons, 10 electrons
- Rb: 37 protons, 37 electrons
- Br-: 35 protons, 36 electrons

Now, let's compare their positions on the periodic table:
- O2-, F-, and Ne are all in the same period (row), so we'll compare their atomic numbers (protons) to determine their size. As we move across a period from left to right, the atomic radius decreases, so the order will be O2- > F- > Ne.
- Rb and Br- are in the same group (column). Going down a group, the atomic radius increases, so Rb > Br-.

Finally, we can combine these orders to get the overall order of increasing radius: O2- < F- < Ne < Br- < Rb.

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Answer: Matter is made of atoms. Solids, liquids, gases, and plasma are all matter. When all atoms that make up a substance are the same, then that substance is an element. Elements are made of only one kind of atom.

Explanation:

Horner-Wadsworth-Emmons (HWE) reaction is an important synthetic reaction in organic chemistry. It is widely used for synthesizing various compounds. The reaction is between an aldehyde or ketone and a phosphonate or phosphonate ester in the presence of a strong base.

The Horner-Wadsworth-Emmons reaction is one of the most convenient and well-known methods of constructing carbon-carbon double bonds. The reaction proceeds via the formation of an ylide intermediate. The HWE reaction is particularly useful for the synthesis of compounds with a Z-configuration.

The mechanism for the reaction of diethyl benzylphosphonate and 3,4-methylenedioxybenzaldehyde in the presence of aqueous NaOH, forming 3,4-methylenedioxystilbene as the product, can be explained in the following steps:

Step 1: Formation of the ylide intermediate

The reaction starts with the formation of an ylide intermediate. This is achieved by the reaction of diethyl benzylphosphonate and 3,4-methylenedioxybenzaldehyde in the presence of a strong base like NaOH or KOH. In this reaction, a deprotonated species called an ylide intermediate is generated.

Step 2: Addition of the ylide intermediate to the aldehyde

The ylide intermediate then attacks the aldehyde, leading to the formation of a betaine intermediate.

Step 3: Formation of the phosphonate ester

The betaine intermediate undergoes elimination to form the final product, 3,4-methylenedioxystilbene, and the by-product phosphonate ester.

The mechanism of the Horner-Wadsworth-Emmons (HWE) reaction between diethyl benzylphosphonate and 3,4-methylenedioxybenzaldehyde in the presence of aqueous NaOH, forming 3,4-methylenedioxystilbene as the product, is complete. This reaction is significant in organic chemistry and finds applications in the pharmaceutical industry.

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A) At the lower triple point, which is the point where the solid, liquid, and gas phases can coexist in equilibrium, the phases present are diamond, graphite, and liquid.

B) At 100 atm and 6000 K, the stable phase of carbon is graphite.

C) The process of lowering the temperature and raising the pressure is necessary to produce liquid carbon from the lower triple point.

At 100 atm and 6000 K, the stable phase of carbon is graphite. This means that under these specific conditions, graphite is the most thermodynamically stable phase of carbon.
If one were to start from the lower triple point and want to produce liquid carbon, they would need to lower the temperature and raise the pressure. This is because at the lower triple point, the pressure and temperature are balanced between the three phases. To shift the equilibrium towards the liquid phase, one needs to lower the temperature, which reduces the kinetic energy of the atoms and makes it easier for them to stick together, forming a liquid. Additionally, raising the pressure compresses the atoms together, which also makes it easier for them to stick together and form a liquid.
Therefore, the process of lowering the temperature and raising the pressure is necessary to produce liquid carbon from the lower triple point. Understanding the phase diagram of carbon is essential for many applications, including material science, metallurgy, and the development of advanced materials.

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All statements given in the question are incorrect except for 1 statement. The correct statement is:1 s = 10^3 ms.

In the question, we have been provided with 5 statements. We are asked to select all the correct statements from those 5 statements. Given below are for each statement:1 g = 10^3 mg:This is incorrect. 1 g is equal to 1000 mg.10^-3 g = 10^12 ng:This is incorrect. 10^-3 g is equal to 1 mg.1 km = 10^5 mm:This is incorrect. 1 km is equal to 1,000,000 mm.1 s = 10^6 μs:This is incorrect. 1 s is equal to 1,000,000 μs.1 s = 10^3 ms:This is correct. 1 s is equal to 1000 ms.Therefore, the main answer to this question is that only 1 statement is correct, which is:1 s = 10^3 ms.

Metric units are based on the power of ten. The base units of the International System of Units (SI) are the meter, kilogram, second, kelvin, ampere, mole, and candela. All other metric units can be derived from these basic units.The first unit in each conversion is in grams, seconds, or kilometers. The metric units for millimeters, microseconds, and nanograms are derived from these basic units. One gram is equal to 1000 milligrams (mg), 1 second is equal to 1000 milliseconds (ms), and 1 kilometer is equal to 1000000 millimeters (mm). 10^-3 g is equal to 1 milligram (mg), 10^6 μs is equal to 1 second (s), and 10^12 ng is equal to 1 gram (g).

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The 38.59 gram of oxygen is required to burn 11gram of octane.

2C8H18 + 25O2 = 16CO2 + 18H2O

The complete combustion of 2 x114 gram of octane require 25 x 32 gram of oxygen.

so the 11 gram of octane needs 38.59 gram of oxygen according to balanced chemical equation.

Alkane releases a tremendous amount of heat energy when heated in the presence of enough oxygen or air to form carbon dioxide and water. It happens when there is not enough oxygen present for the complete combustion of the fuel. As a result, carbon or carbon monoxide is produced. A poisonous gas called carbon monoxide is produced as a byproduct and is colorless.

Hence, octane undergoes complete combustion with oxygen.

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Answer:

A. The atomic radius increases (in a group) with the increasing atomic number. This is because atomic size generally increases from top to bottom within a group because the greater the number of protons means the greater amount of electrons. The amount of electrons in orbitals determine an atom's size/radius.

B. Since Group 1A (Alkali Metals) are metals, they tend to form cations. Cations are always smaller than their original atom because the greater positive charge from the nucleus closes in the space between it and the electrons, thus "shrinking" its size. This is why the ionic radii are smaller than the atomic radii of the same element.

I hoped this helped <3

Explanation:

Answer:

R = 8.314 pKa*L/mol*K

The value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

To determine the value for the ideal gas constant (R) when pressure (P) is in kilopascals (kPa), temperature (T) is in kelvins (K), volume (V) is in liters (L), and amount of gas (n) is in moles, we need to use the appropriate units for R based on these measurements.

The ideal gas constant, R, can be expressed in various units. The most common units for R are:

R = 0.0821 L·atm/(mol·K) (atmospheres, liters, moles, and kelvins)

However, since you provided the measurements in kilopascals, liters, moles, and kelvins, we need to use a different value for R that is consistent with these units:

R = 8.314 kPa·L/(mol·K)

Therefore, when pressure is in kilopascals, volume is in liters, amount of gas is in moles, and temperature is in kelvins, the value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

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Answer:

3.91 on Acellus

Explanation:

1.88 g potassium would be have been used to produce 10.32 g K2S, meaning that 6.41 g S would be left over.

The chemical element with the atomic number 19 and the letter K is potassium. Potassium is a silvery-white metal that may be easily and gently sliced with a knife. Within seconds of exposure, potassium metal quickly combines with air oxygen to produce flaky, white potassium peroxide.

Potassium can be obtained as a dietary supplement and naturally in many foods. Its primary function in the body is to support the maintenance of regular fluid levels inside our cells. It's opposite, sodium, keeps fluid levels within cells normal. Additionally, potassium supports proper blood pressure and aids in the contraction of muscles.

2K + S → K₂S

two moles K react with one mol S

6.41 g S react with K to formed 10.32g of K₂S

stoichiometric ratio of K:S is 2.44

reaction conditions your supplied ratio of K:S is 1.28

Therefore, sulfur is in excess and potassium is the limiting reagent.

The reaction of 6.41 g S would produce 10.32g K2S

The reaction of  6.41 g S would produce  6.41 (10.32/78.2) = 6.47 g K2S

Thus, 1.88 g K would be have been used to produce 10.32   g K2S, meaning that 6.41 g S would be left over.

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6.375 moles of O2 are required to form 4.25mol \(CaCO_{3}\) if the net balanced equation given is,

                Ca (solid) + C (solid) + 3/2 O2 (gas) ⟶\(CaCO_{3}\) (solid).

The balanced equation is,

  Ca (solid) + C (s) + 3/2 O2 (g)  ⟶ \(CaCO_{3}\) (solid).

A balanced equation is defined as a chemical equation in which mass is conserved and there are equal numbers of atoms of each element on both sides of the equation. This equation has an equal number of atoms of each element on both sides of the chemical equation. The mass of the reactants is said to be equals to the mass of the products.

The number of moles of a substance can be expresses as the ratio of its given mass in a chemical reaction to the mass of one mole of that substance. One mole of any substance is equals to Avogadro's number, that is 6.023 × 1023. It is generally used to express concentration units such as mole per liter or molecular weight.

1 mole of \(CaCO_{3}\) is formed by 3/2 moles of O2.

4.25 moles of \(CaCO_{3}\) will be formed by,

    =   3/2 * 4.25

    = 6.375 mole

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From the following balanced equation,

Ca(s) + C(s) + 3/2 O2(g) ⟶\(CaCO_{3}\) (s) how many moles of O2 are required to form 4.25mol CaCO3?

Answer:

I gotchu

Molecule: A group of atoms bonded together. It's the smallest fundamental unit of a chemical compound.

Compound: Any substance composed of identical molecules consisting atoms of 2 or more chemical components. They are also held together by chemical bonds.

Element: An element is a pure substance consisting atoms that all have the same numbers of protons in their atomic nuclei. Chemical compounds can't be broken down into simpler substances by chemicals.

Mixture: A mixture has 2 more substances that are not chemically combined. Both substances retain their identities.

Heterogeneous: Heterogeneous mixtures are typically consisting of different distinguishable parts or elements. It contains two or more phases.

Homogeneous: It's a pure substance that consists of a single phase. The composition is uniform throughout the whole mixture.

Atom: It's the basic unit of a chemical element. Atoms are the smallest unit of ordinary matter that can form a chemical element.

Valence electrons: A valence electron is a negatively charged particle which is located in the outermost shell of an atom. They can participate in the formation of a chemical bond if the outer shell is not closed.

Covalent electrons: They're involved in covalent bonds which is a chemical bond that involves the sharing of electron pairs between atoms. The electron pairs are known as shared pairs or bonding pairs.

Ionic atoms: Atoms that participate in a type of chemical bonding called ionic bonding where the outermost electrons of one atom are transferred permanently to another atom. This happens because of the charge in atoms.

In this instance, the equilibrium concentration of Cu⁺ with 0.10 M Br⁻ is similarly 0.10 M.

To determine the concentration of Cu⁺ in equilibrium with CuBr(s) and 0.10 M Br⁻, we need to consider the solubility equilibrium of CuBr.

The solubility equilibrium for CuBr can be represented as follows:

CuBr(s) ⇌ Cu⁺(aq) + Br⁻(aq)

The solubility product constant (Ksp) expression for this equilibrium is:

Ksp = [Cu⁺][Br⁻]

Since the stoichiometry of the reaction is 1:1 between Cu⁺ and Br⁻, the concentration of Cu⁺ in equilibrium will be equal to the concentration of Br⁻.

Therefore, in this case, the concentration of Cu⁺ in equilibrium with 0.10 M Br⁻ is also 0.10 M.

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The concentration of Cu+ in equilibrium with solid CuBr and 0.10M Br- is 7.9 x 10-5 M. This happens due to the common ion effect, which is the presence of extra Br- ions in solution that suppress the dissolution of CuBr.

You are asked to find the concentration of Cu+ in equilibrium with solid CuBr and 0.10M Br-. The solubility product constant (Ksp) defines the equilibrium between a solid and its constituent ions in a solution. The balanced equation for this dissolution process is:

CuBr(s) <==> Cu+ (aq) + Br- (aq)

For CuBr, the Ksp value is 7.9 x 10-5 M. This represents product of concentrations of its ions in the solution. However, we already have 0.10M Br-, which is much higher than that provided by the dissolution of CuBr. Therefore, the Cu+ concentration in equilibrium is essentially equal to the Ksp, i.e. 7.9 x 10-5 M.

Here, the concept of the common ion effect comes into play. The presence of extra Br- ions from the solution suppresses the dissolution of CuBr, thereby controlling the Cu+ concentration in the solution.

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Answer:

c. The rusting of the joints of a metal children’s swing set.

Explanation:

By definition, chemical property describes the ability of a substance to undergo a specific chemical change.

In the definition above, the key words are; "Chemical change".

Generally, chemical changes are irreversible. This means we just have t observe the options and pick the one that contains an irreversible change.

Upon doing ths, the correct option is;

c. The rusting of the joints of a metal children’s swing set.

This is because rusting is a chemical change and is irreversible.

Answer:

Explanation:

Answer:

B

Explanation:

Answer:

Yes

Explanation:

Due to pollution, greenhouse gasses, etc

Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down forests and farming livestock. This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming.

The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore the mass of PbCl\(_2\) is 19.6g.

According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.

NaCl + Pb (NO\(_3\)) \(_2\)(aq)  → PbCl\(_2\) (s) ↓  + 2 NaNO\(_3\) (aq)

Mass of NaCl =15.90 Grams

Mass of  Pb (NO\(_3\)) \(_2\)=12.10grams

According to law of conservation f mass

mass of reactant = mass of product

Substituting the values we get

15.90g +  12.10g = mass of PbCl\(_2\)+ 8.40g

mass of PbCl\(_2\) =19.6g

Therefore the mass of PbCl\(_2\) is 19.6g.

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Answer:

No one will precipitated because these all are soluble in water

Explanation:

2KNO3 + FeSO4 -----> K2SO4 + Fe(NO3)2

Explanation:

No.of moles =volume in litres/22.4litres

=347.67/22.4=15.52 mole water vapour

A chemical combination of matter in definite (fixed) proportions is called a compound. Compounds are formed when two or more different elements chemically combine in fixed proportions to form a new substance.

The proportions of the elements in a compound are always the same, which gives them their characteristic properties. Pure substances can be either elements or compounds, while physical mixtures consist of two or more substances that are physically combined, but not chemically bonded. An emulsion is a type of physical mixture where two immiscible liquids are mixed together with the help of an emulsifying agent.
A chemical combination of matter in definite (fixed) proportions is called a(n): compound. A compound consists of two or more elements combined in a specific ratio, resulting in a new substance with unique properties. This differs from a physical mixture or an emulsion, which involve mixing substances without a fixed proportion or forming new substances. A pure substance can either be an element or a compound, but in this case, the term "combination" indicates a compound specifically.

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Answer:

3

Explanation:

begining 0's are never significant

all numbers 1-9 are always significant

ending 0's are only significant when there is

a decimal.