What is the component concentration ratio, [CH3COO−]/[CH3COOH], of a buffer that has a pH of 4.650? (Ka of CH3COOH = 1.8 × 10−5)

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I think we make a mistake when we consider that data are qualitative if they come from applying qualitative methods and techniques or if they are collected in qualitative researches. I think we make the same mistake when we consider quantitative all data collected through, for example, questionnaires.

I think we have to consider the qualitative or quantitative character of data looking exclusively at data. Are they numeric? Are they textual or visual?

I think (as Traian Rotariu argues) that quantitative data are numeric and that qualitative data are textual or visual and that we could gather quantitative and qualitative data with each and every method and technique being it qualitative or quantitative.

For example most of the data gathered with questionnaires are qualitative in their primary form: opinions, gender, preferences etc. and just a few are quantitative in their primary form: income, age, children's number And more

Here, Iodine is going under oxidation and Sulphur  reduction.

8[tex]NaI[/tex](aq) + 5  (aq) ---> 4(aq) +  (g) + 4 [tex]Na_{2} SO_{4}[/tex] (aq) + 4[tex]H_{2} O[/tex](l)

the oxidation state of I in NaI is -1 whereas, it is 0 in [tex]I_{2}[/tex] .

in the same way , the oxidation state of S in [tex]H_{2} SO_{4}[/tex] is +6  whereas it is -2 in [tex]H_{2} S[/tex].

what is oxidation?

oxidation is when the element loses its electron ( I went from -1 to 0, losing an electron ).

what is reduction ?

reduction is when the element gains its electron ( S went from +6 to -2, gaining 8 electron ).

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The amount of electricity the plant will use for aluminum production in 1 year is 102×10⁷ KWh of electricity

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

The amount of electricity needed to produce the aluminum for 1 year can be obtained as illustrated below:

From the question given above,

1 Kg of Aluminum required 17 KWh of electricity

Therefore,

60000000 Kg of Aluminum will require = 60000000 × 17 = 102×10⁷ KWh of electricity

Thus, the amount of electricity needed to produce the aluminum for 1 year is 102×10⁷ KWh of electricity

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Answer:

C.) 1345.5 J

Explanation:

To find the energy, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = energy (J)

-----> m = mass (g)

-----> c = specific heat (J/g°C)

-----> ΔT = change in temperature (°C)

The specific heat of aluminum is 0.89 J/g°C. You can plug the given values into the equation and solve.

Q = mcΔT

Q = (150 g)(0.89 J/g°C)(10 °C)

Q = 1335

*It is up to you whether you wish to trust this answer. My answer may be slightly different due to using a different specific heat.

Answer:

C

Explanation:

more products are formed

Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy this postulate of Kinetic Molecular Theory best explain that how this is possible.

Hence, Option B is correct answer.

The Kinetic Molecular Theory or KMT states that gases are composed of a large number of particles. In these particles are much smaller than the distance between particles. No attraction or repulsion between these particles.

The postulates of kinetic theory of gases are:

Collisions between gas particles or collisions with the vessel walls are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the vessel.

Thus from the above conclusion we can say that Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy this postulate of Kinetic Molecular Theory best explain that how this is possible.

Hence, Option B is correct answer.

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Explanation:

m(O2)=50g

m(H2)=50g

m(H2O)-?

n2(H2)-?

2H2 + O2 = 2H2O

n(O2)= m (O2)/M(O2) =50g / 32 g/mol= 1,56 mol.

n(H2)= m (H2)/M(H2) =50g / 2 g/mol= 25 mol.

Since oxygen gas is the limiting reactant,

n(O2)< 2 n(H2) from reaction.

n(H2O)= 2n(O2)= 2n (H2 reac.)=2*1,56 mol=3,12mol.

m(H2O)=n(H2O)*M(H2O)= 3,12mol* 18 g/mol.

n2(H2)= n(H2) - n (H2 reac.)=25mol - 3,12mol=21,88mol.

The name of the disaccharide above is sucrose

Disaccharides are substances which are composed of two molecules of simple sugars or monosaccharides linked to each other.

Below are some examples of disaccharides:

So therefore, the name of the disaccharide above is sucrose

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Characteristics of reliable scientific explanations are present in the development of the atomic theory in the given passage.

Atomic theory is the scientific theory that matter is composed of particles called atoms.

The discoveries of subatomic particles such as;

all contributed in the development of the atomic theory.

From the information given in the passage J.J. Thomson experiment gave rise to atomic model while Rutherford, Geiger and Ernest Marsden, performed the experiment that discovered nucleus and proton.

Thus, characteristics of reliable scientific explanations are present in the development of the atomic theory in the given passage.

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If the bond energy between atoms is very high the the bond between the atoms is strong.

Chemical bonds are formed wen two atoms are combined together. The chemical bonds are responsible for holding the atoms together. These chemical bonds could be ionic or covalent in nature. Coordinate bonds have hybrid behavior between ionic and covalent bond types.

We know that the bond energy refers to the energy that must be supplied in order to break the bonds. A high bond energy implies that it takes a whole lot of energy to break the bond. If it takes a lot of energy to break the bond, then the bond must be a strong bond which holds the two atoms together in the compound. Hence, if the bond energy between atoms is very high the the bond between the atoms is strong.

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Answer:

b.) Br and Br

Explanation:

A covalent bond occurs when electrons are shared between two atoms causing them to form a bond.

A "pure" covalent bond refers to a nonpolar covalent bond. In these bonds, the electrons are shared equally between two atoms as a result of the absence of an (or very small) electronegativity difference. The purest covalent bond would therefore be between two atoms of the same electronegativity. Two bromines (Br) have the same electronegativity, thus making it the purest covalent bond.

Polar covalent bonds occur when electrons are shared unequally between two atoms. There is a larger electronegativity difference between the two atoms, but not large enough to classify the bonds as ionic. In this case, a.) and c.) are polar covalent bonds and d.) is an ionic bond.

Answer:

1.) ⁴₂He

2.) ⁶₂He

3.) ²⁴²₉₄Pu

4.) ¹₀n

Explanation:

The superscript represents the mass number, which is the total amount of protons and neutrons in an element.

The subscript represents the atomic number, which is the total amount of protons in an element.

You can identify the element based on the atomic number. For instance, all atoms with a subscript/atomic number of 2 must always be helium (He). An element with an atomic number of 0 is represented by the symbol "n". The mass number and atomic numbers must be equal on both sides of the reaction.

1.) ¹₁H + ³₁H  → ⁴₂He

    -----> Mass Number: 1 + 3 = 4

    -----> Atomic Number: 1 + 1 = 2

2.) ⁹₄Be + ¹₁H → He + ⁶₂He

    -----> Standard helium (He) has a mass number of 4 and an atomic number of 2

    -----> Mass Number: 9 + 1 - 4 = 6

    -----> Atomic Number: 4 + 1 - 2 = 2

3.) ²³⁹₉₂U + ⁴₂He →  ²⁴²₉₄Pu + ¹₀n

    -----> Mass Number: 239 + 4 - 1 = 242

    -----> Atomic Number: 92 + 2 - 0 = 94

4.) ²⁷₁₃Al + ¹₀n → ²⁴₁₁Na + ⁴₂He

    -----> Mass Number: 24 + 4 - 27 = 1

    -----> Atomic Number: 11 + 2 - 13 = 0

Answer:

5 g / ml

Explanation:

Convert the values given to   g   and ml

12.5 kg = 12500 g

2.5 L = 2500 ml

12500 g / 2500 ml = 5 g/ml

Answer:

Number of neutrons is equal to 148.

Answer:

B.) 1.3 atm

Explanation:

To find the new pressure, you need to use Gay-Lussac's Law:

P₁ / T₁ = P₂ / T₂

In this equation, "P₁" and "T₁" represent the initial pressure and temperature. "P₂" and "T₂" represent the final pressure and temperature. After converting the temperatures from Celsius to Kelvin, you can plug the given values into the equation and simplify to find P₂.

P₁ = 1.2 atm                                    P₂ = ? atm

T₁ = 20 °C + 273 = 293 K              T₂ = 35 °C + 273 = 308 K

P₁ / T₁ = P₂ / T₂                                             <----- Gay-Lussac's Law

(1.2 atm) / (293 K) = P₂ / (308 K)                  <----- Insert values

0.0041 = P₂ / (308 K)                                   <----- Simplify left side

1.3 = P₂                                                         <----- Multiply both sides by 308

Transformation in chemistry is scientifically used to explain the process of changing one compound to another in a chemical reaction.

The word "transformation" has a very special significance in chemistry. We know that in English, to transform would simply imply to change from one form to another. This is not quite far from its meaning in the parlance of chemistry.

The word transformation is normally applied in the area of chemical reactions especially as it has to do with reaction with in organic chemistry. It has to do with the change from one molecule to another and this is of great importance in the discussion of synthetic chemistry.

As such, the word transformation in chemistry is scientifically used to explain the process of changing one compound to another in a chemical reaction.

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Answer:

C.) The coefficient of iodine is 4, oxygen is 9, and the product is 2

Explanation:

An equation is balanced when there is an equal amount of each element on both sides of a reaction. If the amounts are unequal, you can modify the amount of molecules by adding coefficients.

The unbalanced reaction:

I₂ + O₂ -----> I₄O₉

Reactants: 2 iodine, 2 oxygen

Products: 4 iodine, 9 oxygen

The balanced equation:

4 I₂ + 9 O₂ -----> 2 I₄O₉

Reactants: 8 iodine, 18 oxygen

Products: 8 iodine, 18 oxygen

Remember, coefficients are the numbers placed in front of the molecular formulas. As such, the coefficient of iodine is 4, oxygen is 9, and the product is 2.

The amount of heat energy (in KJ) needed to convert 3 moles of water vapor into hydrogen gas and oxygen gas is 1450.8 KJ

We'll begin by writing the balanced equation. This is illustrated below:

2H₂ + O₂ --> 2H₂O ΔH = 483.6 KJ

From the balanced equation above,

2 moles of water (H₂O) required 483.6 KJ to produce hydrogen gas and oxygen gas

The heat energy needed to convert 3 moles of water can be obtained as illustrated below:

From the balanced equation above,

2 moles of water (H₂O) required 483.6 KJ to produce hydrogen gas and oxygen gas

Therefore,

3 moles of water (H₂O) will require = 3 × 483.6 = 1450.8 KJ to produce hydrogen gas and oxygen gas

Thus, we can conclude that the energy needed to convert 3 moles of water is 1450.8 KJ

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The positive Biuret test indicates the presence of Peptide bond in proteins.

How to do Biuret test for proteins?

Follow these simple steps if you want to know practically:

Step 1: Take a 3 clean and dry test tubes.

Step 2: Add 1/2 ml of test solution to one test tube, albumin for another, and distilled water to third test tube.

Step 3: Add 3-4 drops of Biuret reagent to each test tube.

Step 4: Shake wee and let it be for 4-5 minutes.

Step 5: Observe the colour changes.

Peptide bonds are (C - N ) bonds present in proteins. The Biuret reagent colour is Pale blue and when you test for protein, if the solution contain protein, when you add the Biuret reagent it will turns to Purple. If there is no protein then the colour remains same.

The Biuret reagent is made up of Hydrated copper sulfate, sodium hydroxide, and Rochelle salt (sodium-potassium tartrate).

Peptide bond is also referred to as Amide bonds, it is formed between the Nitrogen atom of one amino acid and the Carbonyl carbon of second amino acid.

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The magnet can cause the alignment of electron domains in the metal screw driver on rubbing, causing magnetism.

The magnetism in a permanent magnet is produced by magnetic moments of electrons in the magnet's constituent material. The material's atoms are each like tiny magnet bars. As a result of the quantum mechanical effect, the majority of these tiny magnets now prefer to align in a single direction to form domains, consequently magnetizing the entire substance.

Electrons exist in magnetic metals as well, although they are arranged differently. A strong magnet has a magnetic field strong enough to cause residual magnetism in the metal screwdriver by aligning the domains in it on rubbing with the metal.

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The amount of the nitrogen gas, N₂ molecules present is 2.68×10²² molecules

1 mole of N₂ = 6.02×10²³ molecules

We'll begin by calculating the number of mole of N₂. This can be obtained as follow:

Mole = mass / molar mass

Mole of N₂ = 1.25 / 28.02

Mole of N₂ = 0.0446 mole

From Avogadro's hypothesis,

1 mole of N₂ = 6.02×10²³ molecules

Therefore,

0.0446 mole N₂ = 0.0446 × 6.02×10²³

0.0446 mole N₂ = 2.68×10²² molecules

Thus, the molecules of N₂ present is 2.68×10²² molecules

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C₁₂H₂₂O₁₁

1 )

Molar mass = 12 x 12 + 22 x 1 + 11 x 16

= 144 + 22 + 176

= 342 g

2 )

100 mL of 1.0 M will contain 1.0 x0.100 = .1 mole of sucrose

0.1 mole of sucrose = 0.1 x 342 g = 34.2 g of sucrose.

So , mass of sucrose required is 34.2 g .

3 )

100 mL of .5 M sucrose = .100 x .5 mole of sucrose

= .05 mole of sucrose

.05 mole of sucrose = .05 x 342 g = 17.1 g of sucrose .

So , mass of sucrose required is 17.1 g .

Answer:

A

Explanation:

14=pH + pOH

pOH= 14 - 2

pOH= 12

pOH= -log[OH]

[OH]= 10^-12

=1×10^-12

Benzene, C6H6 is miscible with hexane (C6H14)  but iron (IIl) nitrate, and Sulfuric acid, H2SO4Fe(NO3)3 are not miscible with hexane (C6H14)

Since organic or non polar dissolves in nom polar solvent.here both benzene and hexane (C6H14) are non polar solvents.But iron (IIl) nitrate, Fe(NO3)3 and Sulfuric acid, H2SO4 are inorganic and polar, therefore cannot dissolve with non polar solvent like hexane.

Miscible is a flowery heard that oil and water aren't very miscible substances, while seltzer and orange juice are miscible and scrumptious.Miscible beverages are also described as liquids that can blend to form a homogeneous solution. Miscible drinks generally blend with out limit, meaning they may be soluble at all quantities.

Miscible approach the materials blend completely. If  substances are miscible, they're also absolutely soluble in each other no matter the order of creation. for example, tetrahydrofuran and water are miscible.

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Answer:

v = 2.141 ml

Explanation:

we can use the "ideal gas law" :-

p :- pressure ( pa )

V :- Volume ( m³ )

n :- amount of substance ( mol )

R :- Ideal gas constant ( 8.314 Jmol-¹ K-¹ )

T :- Temperature ( K)

Explanation:

we can use the "ideal gas law" :-

PV = nRT

p :- pressure ( pa )

V :- Volume ( m³ )

n :- amount of substance ( mol )

R :- Ideal gas constant ( 8.314 Jmol-¹ K-¹ )

T :- Temperature ( K)

Answer: I think it's B.

Explanation:

The second ionization energy is always the highest ionization energy. Ionization energy is the energy required to remove an electron from an atom in its gaseous state. Hence the correct option is A.

The first ionization energy is the energy required to remove the first electron from an atom. The second ionization energy is the energy required to remove the second electron from an atom that has already lost one electron.

The first ionization energy is always lower than the second ionization energy because the first electron is easier to remove because it is not as strongly attracted to the nucleus.

Once one electron has been removed, the remaining electrons are more strongly attracted to the nucleus, making it more difficult to remove the second electron.

Therefore, option A) 2nd Ionization Energy is correct.

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