Balance the following skeleton reactions and identify the oxidizing and reducing agents:(a) SO₃²⁻(aq) + Cl₂(g) → SO₄²⁻(aq) + Cl⁻(aq) [basic]

Answer:

1.Frequency

2.Amplitude

3.Wavelength

4.Medium

5.Back and Forth

6.Up and Down

Explanation:

CORRECT ME IF I'm wrong

Answer:

V = 127.57 mL

Explanation:

In this case, we are having an acid base titration, and this, according to the overall reaction:

2H₃PO₄ + 3Ca(OH)₂ -----> Ca₃(PO₄)₂ + 6H₂O

This reaction was neutralized, so, it's a neutralization reaction, therefore, we can use the following expression for neutralization reactions:

n₁ = n₂  (1)

This is because, in the equivalence point, both moles of the reagents are the same. Now we need to do a relation between this and the actual moles that we have according to the overall reaction.

In this case, we have 2 moles of acid reacting with 3 moles of base, so, the equation (1) is re-written like this:

2n₁ = 3n₂   (2)

Knowing this, and that we have values of concentrations and volume, we can write the expression of moles in terms of molarity and volume:

n = M * V    replacing in (2):

2M₁V₁ = 3M₂V₂   From here, we can solve for V₂ which is the volume of the base:

V₂ = 2M₁V₁ / 3M₂   (3)

Now, all we have to do is replace the given values to obtain the volume of the base:

V₂ = 2 * 1.6 * 59.8 / 3 * 0.5

Answer:

\(V_{Ca(OH)_2}=0.287L=287mL\)

Explanation:

Hello,

In this case, given the reaction:

\(2 H_3PO_4 + 3 Ca(OH)_2 \rightarrow Ca_3(PO_4)_2 + 6 H_2O\)

We first compute the moles of phosphoric acid that are actually reacting given the volume (must be in litres) and the molarity:

\(n_{H_3PO_4 }=1.60\frac{mol}{L}*59.8mL*\frac{1L}{1000mL} =0.0957molH_3PO_4\)

Next, we compute the moles of calcium hydroxide that are reacting by using the 3:2 molar ratio with phosphoric acid:

\(n_{Ca(OH)_2}=0.0957molH_3PO_4*\frac{3molCa(OH)_2}{2molH_3PO_4} =0.144molCa(OH)_2\)

Finally, by knowing the 0.500 M of the calcium hydroxide solution we compute the required volume:

\(V_{Ca(OH)_2}=\frac{n_{Ca(OH)_2}}{M_{Ca(OH)_2}}=\frac{0.144mol}{0.500\frac{mol}{L} } \\ \\V_{Ca(OH)_2}=0.287L=287mL\)

Best regards.

Answer:

Groups I & II

Explanation:

The most reactive metal groups on the periodic table are metals of group 1 and II.

Group I elements are the alkali metals

Group II elements are the alkali earth metals

Therefore, elements in groups I and II are the most reactive metallic groups.

Group I elements prefers to lose one electron to attain an octet configuration.

Group II elements prefers to lose two electrons.

The mole fraction of NH3 in the solution prepared by dissolving 15.0 g of nh3 in 250.0 g of water is 0.0597.

To find the mole fraction of NH3 in the solution, we need to first calculate the moles of NH3 and water in the solution.

The moles of NH3 can be found by dividing the mass of NH3 by its molar mass:
moles of NH3 = 15.0 g / 17.03 g/mol = 0.881 mol

The moles of water can be found by dividing the mass of water by its molar mass:
moles of water = 250.0 g / 18.02 g/mol = 13.874 mol

The total moles of solute and solvent in the solution are:
total moles = moles of NH3 + moles of water = 0.881 mol + 13.874 mol = 14.755 mol

The mole fraction of NH3 can now be calculated as the ratio of moles of NH3 to total moles:
mole fraction of NH3 = moles of NH3 / total moles = 0.881 mol / 14.755 mol = 0.0597

Therefore, the mole fraction of NH3 in the solution is 0.0597.

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The molarity of the NaOH solution is 19.35 M. To calculate the molarity of a sodium hydroxide (NaOH) solution, we need to know the mass percent and density of the solution.

Given that the concentrated sodium hydroxide solution is 50.5% NaOH by mass and has a density of 1.53 g/ml at 25°C, we can proceed with the calculation.

Since the solution has a density of 1.53 g/ml, 1 ml of the solution weighs 1.53 grams. Therefore, the mass of NaOH in 1 ml of the solution is 1.53 g * 0.505 (mass percent of NaOH) = 0.774 g.

The molar mass of NaOH is the sum of the atomic masses of sodium (Na), oxygen (O), and hydrogen (H).
This equals 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 40.00 g/mol.

The molarity (M) is defined as moles of solute per liter of solution. Since we have determined the mass of NaOH in 1 ml of the solution (0.774 g), we need to convert it to moles by dividing it by the molar mass:

0.774 g / 40.00 g/mol = 0.01935 mol.

Finally, we need to convert the volume from ml to liters. Since 1 ml is equal to 0.001 L.

So, 0.01935 mol / 0.001 L = 19.35 M.

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The energy that it takes to melt 2 kg of ice is; 2 kg * 1000 g/kg * 1 mol/18.02 g * 6.03 kJ/mol = 669 kJ. The correct option is C.

Energy is a quantitative value. It is the entity that is used in every reaction because without it no reaction can occur. In animals and plants and other organisms, energy is needed to carry out biological functions.

Mass of ice, m = 2 kg

Molar heat of fusion for ice; \(\rm \Delta_fus.H = 6.03 kJ/mol at 0°C.\).

The molar mass of Ice which is water is; 18.02 g/mol

By the formula for calculating energy is:

E = (m/M) * Δ_fus.H

Putting the values in the equation:

E = (2 kg * 1000 g/kg) * 1 mol/18.02 g * 6.03 kJ/mol = 669 kJ

Thus, the correct option is C, 2 kg * 1000 g/kg * 1 mol/18.02 g * 6.03 kJ/mol = 669 kJ.

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The concentration of Cl⁻ ions in a 0.1M solution of calcium chloride (CaCl2) is 0.2 M.

Calcium chloride (CaCl2) dissolves into three ions:

one Ca²⁺ ion and two Cl⁻ ions. So, in a 0.1M solution of CaCl2, we have the following concentrations:

1Ca²⁺= 0.1 and 2Cl⁻ = 0.2

Therefore, the concentration of Cl⁻ ions in a 0.1M solution of calcium chloride (CaCl2) is 0.2 M.

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The concentration of Cl- ions in a 0.1M solution of calcium chloride is 0.2M, as for each molecule of calcium chloride, there are two chloride ions present.

In chemistry, the concentration of ions in a solution is typically determined by the molarity of the compound and the stoichiometry of the ions in the compound.

For example, in the case of a 0.1M solution of calcium chloride (CaCl₂), there are two chloride (Cl-) ions for every molecule of calcium chloride.

Therefore, the concentration of Cl- ions in the solution would be double the molarity of the calcium chloride, or 0.2M.

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Answer:

non of them it is

halogen elements

Answer:

Explanation:

An element with atomic number 18 is a noble gas.

The element with atomic number 19 will have one extra electron so it can donate one electron or shed one electron to attain noble gas configuration .

It tends to shed one electron to become positively charged ion . Hence they are electro-positive elements .  

Similarly the element with atomic number 17 will have one short  electron so it can gain  one electron  to attain noble gas configuration .

They  tend to gain  one electron to become negatively charged ion . Hence they are electro-negative  elements . They have high  electronegativity .

Answer:

ФОТОГРОФИРУЙ

ИЛИ НАПИШИ

В КОМЕНТЫ

Answer:

When aluminum is added to cold dilute hydrochloric acid, there is no reaction because aluminum is a highly reactive metal, but it is protected by a thin oxide layer on its surface. This oxide layer is not easily dissolved by dilute hydrochloric acid, so the aluminum does not react with the acid. In order to react with the acid, a stronger acid such as sulfuric acid or nitric acid is needed to dissolve the oxide layer. Additionally, a higher concentration of hydrochloric acid is also needed to react with aluminum.

Another possible reason is that Aluminium metal react with hydrochloric acid to produce hydrogen gas and aluminum chloride salt, but the reaction is relatively slow and requires heat to speed it up. In cold dilute hydrochloric acid, the reaction rate is too slow to observe any visible change.

Answer:

There is a leyer of aluminium that prevents nothing from happening

Explanation:

Keep in mind that this reaction will not take place as soon as you add the piece of aluminium to the hydrochloric acid solution. That happens because the piece of aluminium is protected by a layer of aluminium oxide, Al2O3 , the same layer that protects aluminium from reacting with water

Answer: In science, a hypothesis is a possible explanation for an observation, while a theory is an explanation that is supported by a large body of evidence.

Explanation: exact answer

Glycine is the N-terminal residue and Serine is the C-terminal residue.

From the given polypeptide Gly-Tyr-Gly-Phe-Met-Ser, the correct statements are:

Glycine is the N-terminal residue: This is correct because glycine is the first amino acid in the sequence, making it the N-terminal residue.

Serine is the C-terminal residue: This is correct because serine is the last amino acid in the sequence, making it the C-terminal residue.

Methionine is the N-terminal residue: This statement is incorrect. Although methionine is present in the sequence,

it is not the first amino acid. Glycine is the first amino acid, so it is the N-terminal residue.

Therefore, the correct statements are:

Glycine is the N-terminal residue.

Serine is the C-terminal residue.

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It have no definete points, with high kinetic energy ions, and called supercooled liquid.

When the constituent particles of a solid lack a regular three-dimensional configuration, the solid is said to be amorphous.

Crystalline solids are described as having highly organised arrangements of their atoms, ions, and molecules in tiny structures.

Amorphouse solids do not have definite no definite points and do not share the same wanderwal forces, so some of their particles melt faster than the other

Some substances that are normally crystalline may become amorphous if they are bombarding it with high-kinetic-energy ions.

A substance that retains certain liquid characteristics, even at temperatures at which it appears to be a solid is a super cooled liquid.

matches to the respective questions:

cubic= a

tetragonal= e

hexagonal =d

trigonal= f

orthorhombic= g

monoclinic= b

triclinic= c

simple cubic= i

face-centered cubic= h

body-centered cubic= j

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Answer:

15.68 Joules

Explanation:

In physics, work is defined as the energy that is transferred to or from an object by a force that displaces that object some distance.  The SI unit for work is a Joule, which itself is defined as 1 kg*m^2/s^2.

The attached file explains the steps to cacluate work done in raising the 2 kg book 0.8m.

Answer:

is this write chemical reaction

Answer:

covection

Explanation:

answer: heat needed=18,300

expanation

Answer:

25-54-46-36 619-73 77-88-50

The correct statement regarding the number of valence electrons to include in the Lewis structure for PCl3 is: Each Cl atom has 7 valence electrons, and the P atom has 5 valence electrons, so the Lewis structure for PCl3 will include 26 electrons.

This is because each Cl atom contributes 7 valence electrons and the P atom contributes 5 valence electrons, resulting in a total of 26 valence electrons for the molecule. The bonding domains in the Lewis structure show the arrangement of these valence electrons around the central P atom in PCl3. Phosphorus (P) has 5 valence electrons, and each chlorine atom (Cl) has 7 valence electrons. The Lewis structure for PCl3 includes a single bond between the P atom and each Cl atom, with three lone pairs of electrons on each Cl atom. Therefore, the total number of valence electrons to include in the Lewis structure is:1 × 5 (valence electrons for P) + 3 × 7 (valence electrons for each Cl) = 26 valence electrons.

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The concentration of calcium hydroxide (in mol/L or g/L), I would be able to assist you in calculating the amount of calcium hydroxide present in the solution.

To determine the grams of calcium hydroxide (Ca(OH)2) in the solution, we need to use the pH and volume of the solution. However, we also require additional information about the concentration of calcium hydroxide in order to make a precise calculation.

The pH of a solution alone does not provide sufficient information to determine the concentration of calcium hydroxide. The pH is a measure of the concentration of hydrogen ions (H+) in a solution, while calcium hydroxide dissociates to produce hydroxide ions (OH-). Without the concentration of calcium hydroxide, we cannot directly calculate the grams of calcium hydroxide in the solution.

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Answer:

Yes

Explanation:

Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei. Everything else about them is the same.(If you want more explanation tell me).

A titration is an experiment where a volume of a solution of known concentration is added to a volume of another solution in order to determine its concentration. Many titrations are acid-base neutralization reactions, though other types of titrations can also be performed.Aug 12,

Answer:

i think 50C

Explanation:

It only makes since cause if its 4.43 and u want the volume to be 3.13 it has to me 50C

Use Charles law

\(\\ \rm\rightarrowtail V_1T_2=V_2T_1\)

\(\\ \rm\rightarrowtail 4.43T_2=(70)(3.13)\)

\(\\ \rm\rightarrowtail 4.43T_2=219.1\)

\(\\ \rm\rightarrowtail T_2=49.4°C\)

Answer:

Explanation:

A chemical formula is the combination of atomic symbols that designate a particular chemical compound, or a substance with two or more different elements.  The formula shows which type and how many of each element makes up that specific compound

Supply curves are created when: the data from a supply schedule is graphed.

The supply curve illustrates the relationship between the price of an item or service and the volume delivered over a specific time period. In a typical scenario, the amount delivered will be shown on the horizontal axis and the price will be shown on the left vertical axis.

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Answer:

no problem

Explanation:

np

A positive ion (cation) indicates the loss of one or more electrons by an atom or molecule, resulting in an overall positive charge.

This occurs through processes such as oxidation or electron transfer, and it is common among metals and in the formation of ionic compounds.

A positive ion, also known as a cation, indicates the loss of one or more electrons from an atom or molecule.

Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in energy levels or orbitals. The number of electrons in an atom is equal to the number of protons, resulting in a neutral charge.

When an atom loses one or more electrons, it becomes positively charged because the number of protons in the nucleus exceeds the number of electrons. This results in an overall positive charge on the ion.

The process of losing electrons is known as oxidation or cation formation. It typically occurs when atoms or molecules interact with other atoms or molecules and transfer electrons.

This transfer can be driven by various factors, such as electronegativity differences or ionization energy considerations.

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A biodiverse environment, one with many distinct species, is frequently more adaptable to changing conditions and can endure major shocks. Each species has a distinct purpose in the coral reef ecosystem.

Better biodiversity contributes to greater stability in ecosystems, animals, and individuals. Species with significant genetic diversity and diverse populations that are adapted to a wide range of environments, for example, are more likely to withstand disturbances, illness, and climate change.

Biodiversity, also known as biological diversity, refers to the variety and variability of life on Earth. Biodiversity is a measure of genetic, species, and ecological variation.

Soil fertilization, nutrient recycling, pest and disease controls, erosion control, and crop and tree pollination are all provided by biodiversity.

High biodiversity is preferable to low biodiversity because high biodiversity ecosystems are better equipped to maintain equilibrium and be productive.

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The mass of zinc, Zn required to generate 0.15 mole of H₂, given the reaction is 9.807 grams

Let us consider the balanced equation to obtain useful information.

Zn + 2HCl -> ZnCl₂ + H₂

From the balanced equation above,

1 mole of H₂ was obtained from 1 mole of Zn

Therefore,

0.15 mole of H₂ will also be obtained from 0.15 mole of Zn.

Finally, we can obtain the mass of zinc, Zn required as follow:

Mole = mass / molar mass

1.15 = Mass of zinc, Zn / 65.38

Cross multiply

Mass of zinc, Zn = 0.15 × 65.38

Mass of zinc, Zn = 9.807 grams

Thus, the mass of zinc, Zn required is 9.807 grams

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