Calculate the hydrogen ion concentration of a Sulfuric acid solution with a pH of 3.21.

[H+] = _______ M (round to 3 sig figs)

(40 points)

Answer: A

Explanation:

As one increases the other goes in a straight line.  It is called a direct proportionality.  Forms a linear graph.

Answer:

predator

Explanation:

Wolves, arctic foxes, and snowy owls are predators in the tundra.

Therefore, at 1.82 atm and 22°C, 218 mol of H2 will fill a volume of 888 L.

1 mole of any gas will take up 22.4 L of space at Standard Temperature and Pressure (STP). The quantity may be determined using the Ideal Gas Law and a balanced chemical equation.

The ideal gas law can be used to resolve this issue:

PV = nRT

The temperature must first be converted to Kelvin by adding 273.15:

T =22°C+273.15

= 295.15 K

After that, we may enter the following values:

P = 1.82 atm

n = 218 mol

R = 0.0821 L·atm/mol·K (gas constant)

So the equation becomes:

V = nRT / P

V = (218 mol)(0.0821 L·atm/mol·K)(295.15 K) / (1.82 atm)

V = 888 L.

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At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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Answer:

por favorrr you dummy

Explanation:

Answer:

C.Potassium

Explanation:

As we know that Potassium is a mineral also at the same time it is an electrolyte. It helps for muscles work involves the muscles so that the heartbeat and breathing could be controlled.

Now as per the periodic table on an early basis that depends upon the similar properties so the element that should be grouped with the sodium is Potassium

hence, the option c is correct

According to the early periodic table the element that has been grouped together with Na has been Potassium. Thus, option C is correct.

The early periodic table has been consisted of the elements that has been arranged based on the increasing order of the atomic mass. The grouping of the elements has been performed based on the similarities with the elements.

The sodium has been the electrolyte that has been responsible for maintaining the electrolyte balance in the human body. The sodium has been the smaller size element with being highly reactive.

The element that has also been small size with high reactive, and has been able to maintain the body electrolyte balance has been Potassium.

Thus, according to the early periodic table the element that has been grouped together with Na has been Potassium. Thus, option C is correct.

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In the given reaction, the limiting reactant is C₆H₆ (benzene).

To determine the limiting reactant as well as calculate the mass of HCl produced, compare the moles of each reactant.

The number of moles for each reactant:

Molar mass of Cl₂ = 35.5 g/mol + 35.5 g/mol = 71 g/mol

Moles of Cl₂ = mass of Cl₂ / molar mass of Cl₂

                     = 45 g / 71 g/mol

                     = 0.634 moles of Cl₂

Molar mass of C₆H₆ (benzene) = 12 g/mol + 6(1 g/mol) = 78 g/mol

Moles of C₆H₆ = mass of C₆H₆ / molar mass of C₆H₆

                        = 45 g / 78 g/mol = 0.577 moles of C₆H₆

Determine the stoichiometry between Cl₂ and HCl:

Cl₂ + C₆H₆ → C₆H₅Cl + HCl

Here, we can see that 1 mole of Cl₂ produces 1 mole of HCl.

Thus, the limiting reactant is C₆H₆ (benzene).

Calculate the mass of HCl produced:

Molar mass of HCl = 1 g/mol + 35.5 g/mol = 36.5 g/mol

Moles of HCl produced = moles of C₆H₆ = 0.577 moles

Mass of HCl produced = moles of HCl produced × molar mass of HCl

Mass of HCl produced = 0.577 moles × 36.5 g/mol

                                     ≈ 21.04 g

Therefore, approximately 21.04 grams of HCl will be produced.

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Answer:

+1

Explanation:

Na₂O₂

NOTE: the oxidation number of oxygen is always –2 except in peroxides where it is –1.

Thus, we can obtain the oxidation number of sodium (Na) in Na₂O₂ as illustrated below:

Na₂O₂ = 0 (oxidation number of ground state compound is zero)

2Na + 2O = 0

O = –1

2Na + 2(–1) = 0

2Na – 2 = 0

Collect like terms

2Na = 0 + 2

2Na = 2

Divide both side by 2

Na = 2/2

Na = +1

Thus, the oxidation number of sodium (Na) in Na₂O₂ is +1

Answer:

Explanation:

Pressure and volume are indirectly related.

Pressure and temperature are directly related.

so first ? is increase

2nd ? is decrease

A diprotic weak base (B) has pb values of 3.722 (pb1) and 6.514 (pb2). The pH at which the dissociation of the first and second proton of a diprotic weak base is equal to its pKb1 and pKb2 values respectively. The pH at which the concentration of all the three forms of the base (B, BH+ and BH22+) is equal is given by the midpoint pH, pKb1 and pKb2, and is calculated using the equation:pH = 1/2 (pKb1 + pKb2)

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The phenomenon that best explains the miscibility of heptane in pentane is that both are non-polar compounds.

Solubility is defined as the ability of a solute or substance to dissolve in a given solvent and at a particular temperature.

Heptane is a straight-chain alkane hydrocarbon that contains 7 carbon atoms. It is a non polar solvent.

Pentane is also a straight-chain alkane hydrocarbon that contains 5 carbon atoms. It is also a non- polar solvent.

Both pentane and heptane are non-polar because the atoms in their molecules share electrons equally. They are able to dissolve each other because they are alike.

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Percentage denotes a quantity per million ( ppm, where a part for a solution is a unit of mass (g, g, g, kg, et.) or capacity (L, mL, L, etc.). The quantity expressed in percent solutions

What stage is a solution in?

When the solvent makes up a significant portion of the combination, as is frequently the case, the solution typically has the condition of the solvent. The concentration of a solution, which measures how much solute is present in a specific volume of solution or solvent, is one crucial parameter. When water is one of the solvents, the phrase "aqueous solution" is used.

What material is dissolving in the solution to create a solution?

A solute is the material that dissolves in a solvent to create a solution. It is less prevalent in the solution than the solvent. A solvent is a substance that is present in a solution that dissolves a solute. It is more prevalent than the solute in solution. If we use a saltwater solution.

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There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).

The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.

Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.

Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.

In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.

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Atomic radius increases with atomic number and mass only on moving down the group while it decreases on moving along a period.

On moving down the group, atomic radius increases as a new shell is successively added along each group and mass only increases because with each element there is an increase in number of protons which leads to the increase in mass.

While, moving across a period, atomic radius decreases as electrons are added  to the same shell and due to the inter-electronic repulsions  the atom tends to shrink.

Factors which lead to an increase in atomic radius are:

1)Number of protons

2)Number of shells

3)Shielding effect

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Answer:

Option A. 250 mL

Explanation:

From the question given above, the following data were obtained:

Molarity of NaCl = 3 M

Mass of NaCl = 43.83 g

Volume of water =..?

Next, we shall determine the number of mole in 43.83 g of NaCl. This can be obtained as follow:

Mass of NaCl = 43.83 g

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol

Mole of NaCl =?

Mole = mass/molar mass

Mole of NaCl = 43.83/58.5

Mole of NaCl = 0.749 mole

Next, we shall determine the volume of water required to prepare the solution as follow:

Mole of NaCl = 0.749 mole

Molarity of NaCl = 3 M

Volume of water =..?

Molarity = mole /Volume

3 = 0.749 /volume

Cross multiply

3 × volume = 0.749

Divide both side by 3

Volume = 0.749/3

Volume = 0.25 L

Finally, we shall convert 0.25 L to millilitres (mL). This can be obtained as follow:

Recall:

1 L = 1000 mL

Therefore,

0.25 L = 0.25 L × 1000 mL / 1 L

0.25 L = 250 mL

Therefore, 0.25 L is equivalent to 250 mL.

Thus, the volume of water needed to prepare the solution is 250 mL

Answer:

a. 2-heptanone is more reactive than 4-heptanone

b. chloromethyl phenyl ketone is more reactive than bromomethyl phenyl ketone

Explanation:

The reactivity of the carbonyl compound (ketone ) is affected by the steric effect. The steric effect is a hindrance that occurs in the structure or reactivity of a molecule, which is affected by the physical size and the proximity of the adjacent parts of the molecule.

Between 2-heptanone or 4-heptanone, 2-heptanone is more reactive than 4-heptanone. This is because 2-heptanone is less affected by the steric hindrance, unlike the 4-heptanone.

Similarly, the reactivity of the carbonyl compound (ketone) is also affected by the polarity on the carbon compound, which is associated with how electronegative the substituent attached is to the carbonyl compound. From the periodic table, the electronegativity of the Halogen family decreases down the group. Therefore chlorine is more electronegative than bromine.

As such, chloromethyl phenyl ketone is more reactive than bromomethyl phenyl ketone.

Because air puffs up the cream as it is whipped, there is a physical change even though the ingredients are still cream and air.

Physical modifications are those that affect a chemical substance's form but not its chemical content. Physical changes may normally be used to separate compounds into chemical elements or simpler compounds, but they cannot be used to separate mixtures into their component compounds.

Liquid cream is extensively combined with small air bubbles to form the foam colloid known as whipped cream. Because milk is transformed from a colloid (cream) to a solid (butter) without changing its chemical makeup, turning milk into butter is a physical transformation. This change in the body can be undone.

Thus, there is a physical change even though the ingredients are still cream and air.

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For Test One, phenotype ratio is Short fur : Long fur = 2 : 0; For Test Two, the phenotype ratio is Short fur : Long fur = 3 : 1; For Test Three, the phenotype ratios will be Short fur : Long fur = 0 : 2

For Test One:

Parent 1: FF (homozygous dominant for short fur)

Parent 2: Ff (heterozygous for short fur)

The Punnett square for this cross will give the following genotype ratios:

FF : Ff = 1 : 1

And the corresponding phenotype ratios will be:

Short fur : Long fur = 2 : 0 or 100% short fur

For Test Two:

Parent 1: Ff (heterozygous for short fur)

Parent 2: Ff (heterozygous for short fur)

The Punnett square for this cross will give the following genotype ratios:

FF : Ff : ff = 1 : 2 : 1

And the corresponding phenotype ratios will be:

Short fur : Long fur = 3 : 1 or 75% short fur and 25% long fur

For Test Three:

Parent 1: ff (homozygous recessive for long fur)

Parent 2: ff (homozygous recessive for long fur)

The Punnett square for this cross will give the following genotype ratios:

ff : ff = 1 : 0

And the corresponding phenotype ratios will be:

Short fur : Long fur = 0 : 2 or 100% long fur

For this investigation, the test variable is the breed of hamster and the outcome variable is the phenotype of the hamster.

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If 2.54 g of PbS is burned with 1.88 g of O2, approximately 2.20 grams of Pb will be produced.

The balanced equation for the reaction of lead sulfide (PbS) with oxygen (O2) to produce lead (Pb) and sulfur dioxide (SO2) is as follows:

2PbS + 3O2 -> 2Pb + 2SO2

From the balanced equation, we can see that the stoichiometric ratio between PbS and Pb is 2:2 or 1:1. This means that for every 1 mole of PbS, 1 mole of Pb is produced.

To calculate the number of moles of PbS, we need to divide the given mass (2.54 g) by its molar mass:

Molar mass of PbS = 207.2 g/mol (Pb) + 32.07 g/mol (S) = 239.27 g/mol

Moles of PbS = 2.54 g / 239.27 g/mol = 0.0106 mol

Since the stoichiometric ratio between PbS and Pb is 1:1, the number of moles of Pb produced is also 0.0106 mol.

To calculate the mass of Pb, we multiply the number of moles by its molar mass:

Molar mass of Pb = 207.2 g/mol

Mass of Pb = 0.0106 mol x 207.2 g/mol = 2.20 g

This calculation is based on the stoichiometric ratio between PbS and Pb, where 1 mole of PbS produces 1 mole of Pb. By converting the given mass of PbS to moles and then multiplying by the molar mass of Pb, we can determine the mass of Pb produced.

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Answer:

C.

Explanation:

because the heat From the nickel and the heat from the water are the same.

As a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there will be no transfer of heat from the nickel to the water in the glass.

To answer the question, we need to know what heat transfer is.

This is the flow of heat energy from one body to another over a temperature gradient.

Since a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there is no temperature gradient, since, both bodies are at the same temperature. Thus, no heat is transferred from the nickel to the water.

So, as a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there will be no transfer of heat from the nickel to the water in the glass.

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Answer:

Magnesium in tube 3 and copper in tube 5 became compounds

If each of the test tubes contained a less reactive compound and a more reactive element or less reactive element and more reactive compound , in first case chemical change of displacement reaction will occur while in second case no reaction will occur as zinc exists as an element.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer: FeO

Explanation:

Answer:

This is not worth 50 points liar

Explanation:

Answer:

Explanation:

Answer in attached file .

Five is the total number of peaks due to singly charged ions in the complete mass spectrum of chlorine, \(Cl_{2}\)

How many peaks do \(Cl_{2}\)'s molecular ions have?

The mass spectra of compounds with a single chlorine atom show two molecular ion peaks. This is because there are two isotopes of chlorine, 35Cl and 37Cl.

The molecular ion and fragment ions will both have peaks in the mass spectrum. When a mass spectrum is interpreted, a specific molecule can be located, confirmed, or its quantity can be calculated. the base summit of a mass spectrum's tallest (strongest) peak, caused by the ion with the highest relative abundance

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Five is the total number of peaks due to singly charged ions in the complete mass spectrum of chlorine, \(Cl_{2}\).

How many peaks do 's molecular ions have?

The mass spectra of compounds with a single chlorine atom show two molecular ion peaks. This is because there are two isotopes of chlorine, 35Cl and 37Cl.

The molecular ion and fragment ions will both have peaks in the mass spectrum. When a mass spectrum is interpreted, a specific molecule can be located, confirmed, or its quantity can be calculated. the base summit of a mass spectrum's tallest (strongest) peak, caused by the ion with the highest relative abundance

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If an equation includes 7(CrO₄)₂, the numbers of Cr's and O's atoms that are there are 14 and 56 respectively.

The number of atoms present in a chemical compound can be calculated by multiplying the subscript of the particular element by any coefficient.

According to this question, 7 moles of chromate with the chemical formula; (CrO₄)₂ is given. The number of oxygen and chromium atoms in this compound can be calculated as follows:

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Answer:

The metals are located on the left and the non-metals are located on the right.

Explanation:

Hope this helps :)

Answer:

the unit of force is newton represented with symbol "N"

Answer:

true

Explanation:

Answer:

a) molarity of CCl3F = 1.12 × 10^-11 mol/dm³

Molarity of CCl2F2 = 2.20 × 10^-11 mol/dm³

B) molarity of CCL3F = 7.96 × 10 ^-13 mol/dm³

Molarity of CCl2F2 = 1.55 × 10^-12 mol/dm³

Explanation:

Using the ideal gas equation:

PV = nRT

Further explanations are found in the attachment below.