If 450 ml of water are added to 550 ml of a 0.75 m k2so4 solution, what will the molarity of the diluted solution be?

The acidic substance isolated from cell nuclei by Friedrich Miescher in 1869 is DNA (deoxyribonucleic acid).

DNA is a molecule that contains genetic instructions for the growth, development, functioning, and reproduction of all living things.

It is found in the nucleus of cells and is composed of nucleotides.

The first step towards discovering the genetic material was taken by Friedrich Miescher in 1869.

He discovered that there were acidic substances in the nuclei of cells.

To isolate and purify the substance, Miescher used salmon sperm, which had abundant nuclei.

These nuclei were extracted using a weak salt solution, after which they were dissolved in dilute acid.

The solution was then neutralized with sodium hydroxide, and the DNA precipitated out of the solution.

Miescher called this substance "nuclein" because it was found in the nuclei of cells.

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The soda water didn't freeze because of the depression in freezing point as compared to the water.

When a solute is added to a pure solvent , then the value of freezing point is reduced.

The decrease in the freezing point is directly proportional to the molality of the solute.

It is given in the question that

A student put a bottle of water and a can of sugared soda in the freezer to chill them quickly.

when she took them out, the bottle of water was frozen but the can of soda was not.

It is because water is the pure solvent , so freezing point is fixed but the soda water has sugar and Carbon Di oxide along with the solvent water , the presence of the sugar and Carbon -di-oxide decreases the freezing point of the soda water and so it doesn't freezes.

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The estimated solubility of silver chloride (AgCl) in an isotonic saline solution, which is a 1.15 × 10⁻¹² M. aqueous solution of NaCl, can be determined using the solubility product constant (Ksp) for AgCl.

The solubility product constant (Ksp) is a measure of the extent to which a sparingly soluble salt dissociates into its constituent ions in a solution. For silver chloride (AgCl), the Ksp expression is given by:

AgCl ⇌ Ag⁺ + Cl⁻

To calculate the solubility of silver chloride (AgCl) in the isotonic saline solution, we use the solubility product constant (Ksp) for AgCl, which is 1.77 × 10⁻¹⁰.

AgCl ⇌ Ag⁺ + Cl⁻

Since the isotonic saline solution is a 0.154 M aqueous solution of NaCl, we can assume that the concentration of Cl⁻ ions is also 0.154 M.

Therefore, the solubility of AgCl can be estimated as follows:

Ksp = [Ag⁺][Cl⁻]

1.77 × 10⁻¹⁰ = [Ag⁺] × (0.154)

[Ag⁺] = (1.77 × 10⁻¹⁰) / (0.154

[Ag⁺] ≈ 1.15 × 10⁻¹² M

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Answer:

Brass and bronze are both metal alloys, which means they are a combination of two or more different metals. Brass is composed of copper and zinc, whereas bronze is made up of copper and tin, sometimes with other elements such as phosphorus or aluminium added in.

Answer:

Both brass and bronze are metal alloys, which are made up of two or more distinct metals. Brass is comprised of copper and zinc, while bronze is formed of copper and tin, with the addition of phosphorous or aluminum.

Explanation:

Hope it helps;)

Answer:

AX+BY=AY+BX

Explanation:

Double-replacement reactions are represented by the general equation AX+BY=AY+BX a reaction in which a substance combines with oxygen, releasing a large amount of energy in the form of light and head

Option (A) is correct. LiOH is the most likely strong base added to the container containing a mixture of 0.02g g and 30ml of water.

A base is said to be a strong base if that can remove a proton (H+) from  a molecule of even a very weak acid such as water in an acid–base reaction. Some examples of strong bases are hydroxides of alkali metals and alkaline earth metals like sodium hydroxide and Ca(OH). A strong base is defined as a base that is completely dissociated in an aqueous solution. The strong bases ionizes in water to yield one or more hydroxide ion (OH-) per molecule of base. Basically strong base is a compound that has an ability to remove a proton from a very weak acid. It can completely dissociate into its ions when in water.

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Complete question is,

A scientist mixes 0.02 g of a strong base in 83 ml of water and obtains a pH of 12. he then realizes that he forgot to label the container and forgot what base he added. what is the most likely the identity of this base?

A. LiOH

B. NaOH

C. RbOH

D. KOH

Answer:

The correct answer is 14 cm³.

Explanation:

Based on Archimedes Principle at rest when a body is completely or partially immersed within a fluid, it encounters a vertical thrust, which is equivalent to the weight of the fluid that the body displaces. In the mentioned case, the fluid is water. Thus, the rock being denser will result in the displacement of water, making the level of water to ascend in the cylinder.  

Thus, if V₁ or the initial volume is 20 ml or 20 cm³, and after insertion of the rock, the rise in the level of water becomes V₂ as 34 ml or 34 cm³. Then the volume of the rock will be,  

V = V₂ -V₁ = 34 - 20 = 14 cm³.  

Answer:

i'm attaching the report i made

Explanation:

(It does include the chart information)

hope this helps! have a wonderful day :)

The solubility of a solid solute increases with temperature.

The solubility of a solute is the amount of solute that dissolves in a given volume of solvent at a particular temperature.

The solubility of a solute increases with increase in temperature.

Based on the lab results, it was seen that with increase in temperature, the mass of sugar that dissolves in water increases.

50 mL of water at 2 °C dissolved only 80 g of sugar whereas at 102 °C, 250 g of sugar dissolved.

Therefore, it can be concluded that solubility of a solute increases with temperature.

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The correct answer for the question is : The 1-mole sample that has the most entropy is (4) Br2 (g) at 332 K.

Entropy is a measure of the disorder or randomness of a system. The greater the entropy, the greater the disorder. The state of a substance (solid, liquid, or gas) and the temperature both affect the entropy of a system. Generally, gases have the highest entropy, followed by liquids, and then solids.

This is because gases have the most disorder and freedom of movement, while solids have the least. Additionally, higher temperatures lead to greater entropy because the particles have more energy and can move around more freely.

In this case, the sample with the highest entropy is (4) Br2 (g) at 332 K because it is in the gaseous state and at the highest temperature. The other samples, (1) Br2 (s) at 266 K, (2) Br2 (l) at 266 K, and (3) Br2 (l) at 332 K, all have lower entropy because they are either in the solid or liquid state, or at a lower temperature.

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Answer:

C

Explanation:

this is because the rest talk about the findings of protons,neutrons and electrons.

According to the hypothesis of ionization when Swedish scientist Svante Arrhenius, also known as Arrhenius recommended the notion of bases and acids in 1884.

The Arrhenius was theory of base and acid formation was developed by The young man August Arrhenius the (1959–1927), whom drew on the findings and research of the people who went after him. in this theory, bases are things that "deliver hydroxy the anions to the solution," while acids are things that "deliver hydrogen anions to the solution."

The Brnsted-Lowry Acid and Base Hypothesis Because they combine with the hydrogen ions of acid to generate water, oxidizing ions are still considered bases. An acid reacts with the liquid molecules by giving it a proton, which allows liquid water molecule to generate ionized hydrogen in solution.

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Answer:

Explanation:

When you are pedaling the bike, it is transforming chemical energy, supplied by the breakdown of the food you eat (any food), into mechanical energy to turn the pedals (energy we produce). The chemical energy is potential and the mechanical energy is kinetic.

Hope this helps :)

Answer:

108 grams

Explanation:

According to the concept of stoichiometry and limiting reactant , the limiting reactant for the given reaction is aluminium as without it formation of product is not possible.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is an important concept while balancing chemical equations.

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Answer:

the mass of an object depends on inertia greater is the inertia greater will be the mass or vice versa

Explanation:

hope it help ^_^

Mass is the most basic property of matter and it is one of the fundamental quantities. Mass is defined as the amount of matter present in a body. The SI unit of mass is the kilogram (kg). The formula of mass can be written as:

Mass = Density × Volume

The mass of a body is constant; it doesn’t change at any time. Only in certain extreme cases when a huge amount of energy is given or taken from a body, the mass may be impacted. For example, in a nuclear reaction, a tiny amount of matter is converted into a huge amount of energy, this reduces the mass of the substance.

There are various units for calculating mass, like, kilograms, grams, lbs, pounds, etc., but the SI unit of mass is "kilograms" or kg. Every unit of mass can be converted to other units by using a proper conversion formula without affecting the meaning and essence of the quantity to be measured.

HENCE,MASS OF AN OBJECT DEPENDS ON:

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The standard Gibbs free energy change (ΔG°) for the given redox reaction is -20979 J/mol.

To calculate the standard Gibbs free energy change (ΔG°) for the given balanced redox reaction, we need to use the tabulated half-cell potentials (E°) and the Nernst equation.

The given half-reactions are:
1) I2(s) + 2e- → 2I-(aq)    with E° = 0.535 V
2) Fe3+(aq) + 3e- → Fe(s)   with E° = -0.036 V

The overall reaction is:
3I2(s) + 2Fe(s) → 2Fe3+(aq) + 6I-(aq)

We can use the Nernst equation to calculate the overall cell potential (Ecell):

Ecell = E°cathode - E°anode
      = (0.000 V) - (-0.036 V)
      = 0.036 V

The standard Gibbs free energy change (ΔG°) can be calculated using the formula:

ΔG° = -nFEcell

where n is the number of electrons transferred in the balanced equation (in this case, 6) and F is Faraday's constant (F = 96485 C/mol).

ΔG° = -(6)(96485 C/mol)(0.036 V)
      = -20979 J/mol

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Answer:

A. Molarity will increase .

Explanation:

Molarity = moles of solute per litre of solution

= moles of solute / volume of solution

If evaporation occurs , volume of solution decreases and moles of solute remains constant . Hence denominator decreases and numerator remains constant .

Hence the molarity increases .

Cr (chromium) and Cu (copper) do not have the expected electron configurations because they achieve greater stability by having a half-filled or fully filled d-subshell.

According to the Aufbau principle, electrons are filled in orbitals following a specific order. However, chromium and copper are exceptions to this rule. Chromium's expected electron configuration is [Ar] 4s2 3d4, but it actually has [Ar] 4s1 3d5 configuration.

Copper's expected electron configuration is [Ar] 4s2 3d9, but its actual configuration is [Ar] 4s1 3d10.

These exceptions occur because having a half-filled (in chromium) or fully filled (in copper) d-subshell provides extra stability due to a lower energy state and better electron repulsion minimization.

Summary: Cr and Cu have unexpected electron configurations because they achieve greater stability by having half-filled (Cr) or fully filled (Cu) d-subshells, which lowers their energy state and minimizes electron repulsion.

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Which of the following statements best explains the trends in boiling points?

A. The atomic size increases down the group, and this decreases the strength of the intermolecular forces.

                                           A is incorrect

B. The total number of electrons decreases down the group, and this decreases the strength of the intermolecular forces.

                                            B is incorrect

C. The total number of electrons increases down the group, and this increases the strength of the intermolecular forces.

                                             C is correct

D. The chances of forming a permanent dipole increases down the group, and this increases the strength of the intermolecular forces.

                                              D is incorrect

The boiling point increase down a group because the total number of electrons increases down the group, and this increases the strength of the intermolecular forces. Hence option C is correct.

Boiling point of a substance is the temperature at which the substance changes from its liquid state to vapour state. Boiling point of a molecule or compounds depends on the bond type, molecular weight, temperature and pressure.

For ionic compounds, boiling point will be higher since ionic bonds are stronger than covalent compounds. There is a periodic trend for the physical properties such as boiling point for elements in periodic table.

Down a group, the number of electrons increases and the atomic size also as well as the ionic character increases down a group . These two facts leads to higher intermolecular attraction, thus more temperature have to applied to weaken the bonds.

Higher temperature to be applied means the boiling point of the substance is higher. Therefore, boiling point down a group increases because of the higher intermolecular attraction as said in option C.

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Explanation:

This medication is used as a moisturizer to treat or prevent dry, rough, scaly, itchy skin and minor skin irritations (e.g., diaper rash, skin burns from radiation therapy). Emollients are substances that soften and moisturize the skin and decrease itching and flaking.

Student 1 is correct. He discovered the mistake as;

If the spot was placed below the solvent level, this would cause the sample to be dissolved into the solvent pool before traveling up the plate.

TLC should be positioned so that just the lowest edge of the plate touches the solvent.

Differential affinities (strength of adhesion) of the analyte components towards the stationary and mobile phases result in differential separation of the components. Affinity, in turn, is determined by two molecular properties: adsorption and solubility.

Adsorption is the property of how well a component of a mixture clings to the stationary phase, whereas solubility is the quality of how well a component of a mixture dissolves in the mobile phase.

The greater the adsorption to the stationary phase, the slower the molecule will move across the column.

The more the molecule adsorbs to the stationary phase, the slower it moves across the column.

The greater the molecule's solubility in the mobile phase, the faster it will travel across the column.

Thus, Student 1 is correct. He detected the error by placing the area below the solvent level, which caused the sample to disintegrate into the solvent pool before migrating up the plate.

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if enough thermal energy is removed from the system to cause a change in state A Molecular energy will decrease, and the substance will change from a gas to a liquid.

The correct choice results in the system's molecular energy decreasing and the substance changing from a gas to a liquid. Molecular energy decreases when thermal energy is removed from a system. Kinetic energy is one of thermal energy. • Energy causes an increase in the average speed of a substance's molecules. When energy is removed, the molecular speed decreases, causing a gas to condense into liquids. • Can also refer to nuclei energy levels or vibrational or rotational energy levels in molecules.

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The complete question is :

Which statement best describes what will occur if enough thermal energy is removed from the system to cause a change in state

А Molecular energy will decrease, and the substance will change from a gas to a liquid.

B

Molecular energy will increase, and the substance will change from a gas to a liquid.

C

Molecular energy will decrease, and the substance will change from a liquid to a gas.

D

Molecular energy will increase, and the substance will change from a liquid to a gas.

Pests are drawn to the home for a number of reasons, including 

Any animal or plant that is dangerous to people or causes them harm is considered a pest. The phrase is especially used to describe animals that disturb people, especially in their houses, or cause harm to forests, cattle, or crops.

When other creatures' actions have a negative impact on human goals, humans are intolerant of their existing in the same location as them. Humans have altered the environment for their own interests. As a result, while an elephant is acceptable in its native habitat, it becomes a problem when it tramples crops.

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Answer:

a) Barney wants to repeat the rutheford experiment

b) the element will be in row 8 column 1 being an alkali metal

c) it should be a radioactive element, with a lot of mass

Explanation:

n this exercise they indicate that the particle Gz has atomic number 119 and atomic mass 305 amu, when reviewing the element periodicity table with this atomic number it has not yet been discovered, it should be in row 8 column 1 therefore it should be an alkali metal .

Therefore, it has only one electron in its last orbit.

a) Barney wants to repeat the rutheford experiment

b) the element will be in row 8 column 1 being an alkali metal

c) it should be a radioactive element, with a lot of mass

if you work it put you will get the 3rd one I think

In a galvanic cell or an electrochemical reaction, if there are 3 electrons in a half reactions product, that means it lost its electrons.  Therefore, this is an oxidation reaction.

If a half reaction has a product with electrons on the right side of the equation, it means that the product gained those electrons and was reduced. Conversely, if a half reaction has a reactant with electrons on the left side of the equation, it means that the reactant lost those electrons and was oxidized.

In the given example, if a half reaction has 3 electrons in its product, it means that the product gained 3 electrons and was reduced. Therefore, the corresponding reactant must have lost those 3 electrons and was oxidized. This is because electrons cannot appear or disappear in a chemical reaction; they are merely transferred from one species to another.

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Answer:

carbon dioxide produced, or carbon monoxide, soot produced and Soot can cause breathing problems and it blackens buildings.

Explanation:

During complete combustion carbon and hydrogen combine with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). During incomplete combustion part of the carbon is not completely oxidized producing soot or carbon monoxide (CO).

In 0.75 moles of caffeine, there are a total of 6 carbon atoms, 7.5 hydrogen atoms, 3 nitrogen atoms, and 1.5 oxygen atoms.

To determine the total number of atoms in 0.75 moles of caffeine, we need to consider the molecular formula of caffeine, which is C8H10N4O2. The molecular formula provides the ratios of each element present in the compound. By multiplying the number of atoms in each element by the corresponding coefficient in the molecular formula, we can calculate the total number of atoms. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms in each molecule of caffeine. Multiplying these values by 0.75 moles will give us the total number of atoms in 0.75 moles of caffeine.

The molecular formula of caffeine, C8H10N4O2, provides the number of atoms for each element present in one molecule of caffeine. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms.

To calculate the total number of atoms in 0.75 moles of caffeine, we need to multiply the number of atoms for each element by the coefficient in the molecular formula, and then multiply that by the number of moles (0.75 moles).

For carbon (C): 8 atoms x 0.75 moles = 6 atoms (since there are 8 carbon atoms in one molecule of caffeine).

For hydrogen (H): 10 atoms x 0.75 moles = 7.5 atoms (since there are 10 hydrogen atoms in one molecule of caffeine).

For nitrogen (N): 4 atoms x 0.75 moles = 3 atoms (since there are 4 nitrogen atoms in one molecule of caffeine).

For oxygen (O): 2 atoms x 0.75 moles = 1.5 atoms (since there are 2 oxygen atoms in one molecule of caffeine).

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The molarity of the HCl solution is 1.22 M.

To solve this problem, we need to use the balanced equation provided:

NaOH + HCl → NaCl + H2O

The reaction shows that one mole of NaOH reacts with one mole of HCl to form one mole of NaCl and one mole of water. This means that the number of moles of NaOH used in the titration is equal to the number of moles of HCl present in the solution.

First, let's calculate the number of moles of NaOH used in the titration:

moles NaOH = M x V
moles NaOH = 0.900 M x 0.0540 L
moles NaOH = 0.0486 mol

Since the reaction is 1:1, the number of moles of HCl is also 0.0486 mol. To find the molarity of the HCl solution, we need to divide the number of moles by the volume of the HCl solution used in the titration (40.0 mL or 0.0400 L):

Molarity HCl = moles HCl / volume HCl
Molarity HCl = 0.0486 mol / 0.0400 L
Molarity HCl = 1.22 M

Therefore, the molarity of the HCl solution is 1.22 M.

In conclusion, we used the balanced equation provided to determine the molarity of the HCl solution. We found that the molarity of the HCl solution is 1.22 M by dividing the number of moles of HCl by the volume of the HCl solution used in the titration.

This calculation shows the importance of using balanced equations and stoichiometry in solving chemical problems, which allows us to determine the amount and concentration of substances involved in a reaction.

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