the concentration of naoh is 0.5 m if 20 ml is needed to titrate 35 ml of acid, what is the concentration of the acid?

Answer:

The liquid left after crystallization is called Residue

C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.

In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.

Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.

Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.

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Bond formation is the way in which atoms interact to form compounds.

Bond formation is the way in which atoms interact to form compounds. The following are the kind of bonds formed by the atoms;

C and AI - ionic bond

N and P - covalent bond

N and O - covalent bond

The bonds in each of the lattices are;

CuO - ionic bond

Hg - metallic bond

P2O5 - covalent bond

P - covalent bond

CaCl2 - ionic bond

The following is a depiction of the processes shown;

Na0 →Na+1 - oxidation

P0→P+5  - oxidation

AI+3 → AI0 - reduction

The balanced reaction equations are;

2H2O + F2 → 2HF + O2

SO2 + 3H2 → H2S + 2H2O

2H2SO4 + C → 2SO2+CO2+2H2O

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The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.


The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.

The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.

The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.

So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons

In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion

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Answer:

thank you for the update on

Answer:

es la dos

Explanation:

Answer:

not enough information need more information to answer it

This molecule is called tert-butyl alcohol, also known as tert-butanol and 2-methyl-2-propanol (IUPAC nomenclature).

All carbon atoms are \(sp^{3}\) hybridized. The oxygen atom has the same hybridization, with two of the orbitals being taken by the nonbonding electron pairs, and two by the C-O and the O-H bond.

Tert-butanol is a commonly used polar organic solvent, with a boiling point of 83 degrees Celsius and a density of 0.775 g/mL. Because it has an unusually high freezing point (26 degrees Celsius), pure tert-butanol is often solid at room temperature.
It is colorless, but has a characteristic camphorous smell, and is very miscible with water (dry tert-butanol is usually obtained through distillation over potassium or sodium).

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Answer:

See explanation

Explanation:

Atomic size increases down the group due to the addition of more shells.

As more shells are added and repulsion of inner electrons become more significant, atomic size increases down the group. However, across the period, atomic size decreases due to increase in effective nuclear charge without any increase in the number of shells. This causes increased attraction between the nucleus and the outermost shell thereby decreasing the size of the atom.

Ionization energy decreases down the group because the outermost electron is more shielded by inner electrons making it easier for this outermost electron to be lost. Across the period, ionization energy increases due to increase in effective nuclear charge which makes it more difficult to remove the outermost electron due to increased nuclear attraction.

Answer:

D

Explanation:

Answer:

vaporize the liquid water

Explanation:

Since you don't have to heat ice that much to become liquid water, and you    

need it to be like 252 Fahrenheit to vaporize (or evaporate) water, you need the atoms to move a lot more to evaporate water than to melt ice.

There are several ways in which product loss could occur during a multistep reaction sequence, resulting in a percent yield that is less than 100% are; Reaction incompleteness, Side reactions, Loss during workup and purification, Copper loss evidence, and Filter paper contamination.

If any of the reactions in the sequence are not carried out to completion, it could result in incomplete conversion of starting materials to products, leading to a lower yield.

Side reactions, which are unintended reactions that occur alongside the desired reaction, could also lead to product loss. Side reactions may result in the formation of undesired by-products or the consumption of reactants, reducing the overall yield of the desired product.

The purification steps involved in the multistep reaction sequence, such as filtration, extraction, or washing, could result in product loss.

Evidence of copper loss could be observed during the multistep reaction sequence.

If the filter paper used during the filtration step is not properly washed or dried, it may contain residual water that could contribute to a higher final weight, leading to a percent yield greater than 100%.

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In the solution water is solute and ethanol is solvent.

Binary solution

A mixture of two liquids that are completely miscible one with another is known as a Binary solution. The boiling point of binary solution depends upon the composition of the solution.

A binary solution consists of a solute and a solvent.

The solute is usually present in smaller quantity and solvent is in larger quantity.

If a solution has 70 ml ( larger quantity ) of ethanol , it means ethanol is the solvent .

water with 30 ml of quantity ( smaller quantity ) will be the solute.

So , in the mixture, water is the solute.

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Answer:

Sugar is made up of carbon, hydrogen and oxygen atoms. It's the way these atoms are connected that makes each type of carbohydrate different. In each molecule of table sugar there are: 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms.

Explanation:

occurs when acid rain causes buildings and structures made of limestone or marble to weaken and break apart represents a process known as chemical weathering.When these acids come into contact with limestone or marble, a chemical reaction occurs that dissolves the calcium carbonate present in these rocks.

Chemical weathering is the process by which the chemical composition of rocks and minerals is altered due to the interaction with substances such as water, oxygen, or acids. In the case of acid rain, the rainwater combines with pollutants in the air, such as sulfur dioxide and nitrogen oxide, to form sulfuric acid and nitric acid.

This reaction can be summarized as follows Calcium carbonate (present in limestone or marble) reacts with sulfuric acid or nitric acid.. The carbon dioxide gas is released into the atmosphere, while the water-soluble calcium sulfate or calcium nitrate is washed away.

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The amount of energy absorbed by 2.00 L of gasoline as it is converted to the vapor phase at its boiling point is 22606 J.

We know that;

1 mole of gasoline occupies 22.4 L

x moles of gasoline occupies 2 L

x = 0.089 moles

Then we have that the mass of the gasoline = 0.089 moles * 100 g/mol

= 8.9 g

Then;

H = mL

L = 2540 J/g for gasoline

Thus the energy that is absorbed  is;

H =  8.9 g * 2540 J/g

H = 22606 J

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The observed differences in the two enzymes could be attributed to variations in their amino acid sequences, cofactors, pH and temperature conditions, and the presence of regulatory molecules.

The difference observed in the two enzymes could be explained by several factors. Firstly, the enzymes might have different amino acid sequences, leading to differences in their three-dimensional structures and active sites. This could affect their substrate specificity and catalytic activity.

Secondly, the enzymes may have different cofactors or prosthetic groups associated with them, which can modulate their enzymatic activity. Thirdly, variations in the pH and temperature conditions of the experimental setup could influence the enzyme activity.

Enzymes have optimal pH and temperature ranges at which they exhibit maximum activity, and deviations from these conditions can impact their performance. Additionally, the presence of enzyme inhibitors or activators in the reaction mixture could also contribute to the observed differences. These molecules can bind to the enzyme and either inhibit or enhance its activity, respectively.

Overall, the differences in the two enzymes could arise from genetic variations, variations in cofactors or prosthetic groups, differences in experimental conditions, or the presence of regulatory molecules.

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In a chemical change, the molecules in the reactants interact to form new substances. In a physical change, like a state change or dissolving, no new substance is formed.

hope this helped

Answer:

liters

Explanation:

the answer is liters after searching and searching and searching i found it now i winnnn

Answer:

LITERS (B)

Explanation:

Answer:

C)peer review

Explanation:

Peer review involves the evaluation of scientific research work by other professionals working in the same field. It is one of the stages a manuscript passes through before it is published in any reputable journal.

Peer review is important because it ensures that only high quality and original scientific research is published for the consumption of other professionals in the same field.

Answer:

Its 3

Explanation:

I took the test

Answer: 3

Explanation: im in k12 got the same question

If you start with 6.03 g of crude sulfanilamide and recrystallize it from ethanol to recover 4.82 g of pure sulfanilamide, the percent recovery is 80.1%.

Sulfanilamide, commonly known as sulfanilamide, is an antibacterial sulfonamide medication. It is an organic molecule made composed of an aniline that has been derivatized with a sulfonamide group.

To calculate the percent recovery, we'll divide the mass of pure sulfanilamide obtained (4.82 g) by the initial mass of crude sulfanilamide (6.03 g) and multiply by 100 to express the result as a percentage:

Percent recovery = (mass of pure sulfanilamide obtained / initial mass of crude sulfanilamide) x 100

= (4.82 g / 6.03 g) x 100

= 80.1%

So, the percent recovery in this case is 80.1%.

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When benzene is nitrated with a mixture of nitric and sulfuric acids, the electrophile that attacks the benzene ring is a nitronium ion, which has the chemical formula NO2+. This electrophile is generated in situ from the reaction between nitric acid and sulfuric acid, as shown below:

HNO3 + H2SO4 → NO2+ + HSO4- + H2O

The nitronium ion has a formal positive charge on the nitrogen atom (+1) and a formal negative charge on one of the oxygen atoms (-1), giving it an overall formal charge of 0. The three atoms that make up the nitronium ion are nitrogen (N), oxygen (O), and oxygen (O), arranged in a linear configuration. The nitrogen atom is the electrophilic center, as it is the site of positive charge and the atom that attacks the benzene ring in the nitration reaction.

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Answer:

1.61 g

Explanation:

The freezing point depression of water due to the presence of salt can be calculated using the equation:

ΔTf = Kf × molality

where ΔTf is the freezing point depression, Kf is the freezing point depression constant for water (1.86 °C/m), and molality is the molal concentration of the solution.

Since ocean water freezes at approximately -1.8 °C, the freezing point depression is:

ΔTf = -1.8 °C - (-0.0 °C) = -1.8 °C

The molality of the solution can be calculated as:

molality = moles of solute / mass of solvent (in kg)

Assuming that all the dissolved salt is sodium chloride (NaCl), the molar mass of NaCl is 58.44 g/mol. Therefore, the number of moles of NaCl in the solution is:

moles of NaCl = mass of NaCl / molar mass of NaCl

moles of NaCl = (2.62 kg) × (35.0 g/kg) / 58.44 g/mol

moles of NaCl = 1.57 mol

The mass of water in the solution is:

mass of water = total mass of solution - mass of NaCl

mass of water = (2.62 kg) - (0.035 kg) = 2.585 kg

Therefore, the molality of the solution is:

molality = 1.57 mol / 2.585 kg = 0.607 mol/kg

Using the freezing point depression equation, we can solve for the mass of NaCl:

ΔTf = Kf × molality

-1.8 °C = 1.86 °C/m × 0.607 mol/kg × (1000 g/1 kg)

-1.8 °C = 1122.42 g/mol × x

x = 1.61 g

Therefore, the mass of sodium chloride in a 2.62-kg sample of ocean water is 1.61 g.

Answer:

SO

Explanation:

covalent bond is formed between elements with close electronegativity value

In gases, the particles travel quickly in all directions and regularly collide with one another and the container wall. The particles acquire more kinetic energy and accelerate with rising temperature.

There is not much attraction between the particles in a gas. In comparison to the particles in a solid or liquid, they are extremely widely apart and are always moving. The particles simply strike and bounce off of one other when they collide, without engaging in any interaction.

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The pH at the equivalence point for the titration of 20.00 mL of 0.0250 M formic acid with standard 0.0250 M NaOH is 3.74.

The balanced chemical equation for the reaction is:

HCOOH + NaOH → H₂O + NaHCOO⁻

Firstly, let's calculate the number of moles of formic acid in 20.00 mL of 0.0250 M formic acid.

Number of moles = concentration × volume

Number of moles = 0.0250 M × 20.00 × 10⁻³ L

Number of moles = 5.00 × 10⁻⁴ mol

The balanced chemical equation for the reaction between formic acid and NaOH tells us that one mole of formic acid reacts with one mole of NaOH to form one mole of NaHCOO⁻.

Therefore, the number of moles of NaOH required for complete neutralization of 5.00 × 10⁻⁴ mol of formic acid is also 5.00 × 10⁻⁴ mol.

As the concentration of NaOH is also 0.0250 M, the volume of NaOH required for complete neutralization can be calculated as follows;

Number of moles = concentration × volume

Volume = number of moles / concentration

Volume = (5.00 × 10⁻⁴ mol) / (0.0250 M)

Volume = 0.0200 L or 20.00 mL

So, the volume of NaOH required for complete neutralization is 20.00 mL.

The pH at the equivalence point can be calculated using the following formula;

pH = pKa + log [salt]/[acid]

Here, the salt is sodium formate (NaHCOO⁻) and the acid is formic acid (HCOOH).

At the equivalence point, the number of moles of HCOOH = number of moles of NaHCOO⁻ . Therefore, the concentration of HCOOH and NaHCOO⁻ would be the same.

Concentration of HCOOH = Number of moles / Volume = 0.0250 M

Concentration of NaHCOO- = Number of moles / Volume = 0.0250 M

Therefore, the ratio of [salt] / [acid] = 1.

Substituting the values into the formula;

pH = pKa + log [salt]/[acid]

pH = 3.74 + log 1

pH = 3.74

Therefore, the pH at the equivalence point for the titration of 20.00 mL of 0.0250 M formic acid with standard 0.0250 M NaOH is 3.74.

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1 mols of Aluminium ion forms 1 mol aluminium phosphate

Molar mass of AlPO_4

Moles of AlPO_4

Moles of Al3+=57.5µmol

Answer:

plz I. need a brainliest

Explanation:

I hope you have a good day

Answer:

A-cycles of the moon

Explanation:

The people of Ancient Greece, Rome and China counted their year based on a 12 moon cycle ( that is, about 354 days). A 13th cycle of the moon is included so that the lunar year remains in step with the seasons of the year.

Today, the Gregorian calendar is mostly used around the world. This calendar was

actually adapted from an earlier lunar version. Ancient civilizations used the phases of the moon to help identify the seasons.

The major difference between the lunar calendar and the solar calendar is the kind of celestial body that is used to determine time.