Who invented the clay triangle?

2.18 mg of naoh is needed to prepare 546 ml of solution with a ph of 10.00.

What is Molarity?

The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity.

We want pOH 4 NaOH solution

Given, pH (10) convert to pOH

pOH = 4; pOH = -log (OH⁻) = 1 x 10⁻⁴ M = NaOH

Once we have got the Molarity = Moles of NaOH/Litre of soln.

Stoich = 1 x 10⁻⁴ M/L X 0.546 L X 40 g NAOh/1 mol

Naoh = 2.18 X 10⁻³ g NaOH = 2.18 mg

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climate

Changes in the composition of the atmosphere have caused gradual changes in earth's climate throughout history, causing changes in plant and animal life that contributed to mass extinctions.

The following are some of the reasons:

heat

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Answer:

Mixing chamber

The moles are the estimation of the quantities like the molecules and the atoms. There are 7.984 moles of aluminum present in the 2.154 × 10⁻¹ kg substance. Thus, option b is correct.

The moles give the estimation of the smaller entities by the ratio of mass or weight to the molar mass of the substance.

The formula for moles is given as,

Moles = mass ÷ molar mass

Given,

Mass of aluminium = 2.154 × 10⁻¹ kg = 2.154 × 10² gm

Molar mass of Al = 26.9 g/mol

Substituting values above:

Moles = 2.154 × 10² gm ÷ 26.9 g/ mol

= 7.984 mol

Therefore, option. 7.984 moles of aluminum are present.

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The states of matter change to produce the same or the new substance. When yeast is added to hydrogen peroxide bubble of carbon dioxide is formed which indicates chemical change.

A chemical change is the formation of a new substance by the chemical alterations in the reactants. The yeast releases products of cellular respiration that react with hydrogen peroxide.

The reaction is exothermic as it releases heat and increases the temperature when measured by the thermometer. The Fizzing and bubbling occur when carbon dioxide reacts with H₂O₂ to produce a new substance.

Therefore, addition of yeast to hydrogen peroxide is a chemical change.

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Answer:

The type of change that took place is most likely a chemical change, due to the recordable reactivity of the hydrogen peroxide to the yeast granules in the experiment.

Explanation:

As stated in the question, the hydrogen peroxide started fizzing and bubbling in reaction to the yeast granules, which is already a sign of a chemical change. The question also states that there was an increase in temperature. This is another sign of a chemical change. Hope this helped (;

There are 3 moles of [tex]H_{2} O[/tex]  are produced in neutralization when 1. 5 mole of [tex]Mg(OH)_{2}[/tex]  reacts with [tex]H_{2} SO_{4[/tex]

The neutralization reaction between magnesium hydroxide and sulfuric acid is given as,

[tex]Mg(OH)_{2} + H_{2} SO_{4[/tex] → [tex]MgSO_{4} + 2H_{2} O[/tex]

from above chemical equation , we can conclude the molar ratio = 1:2

It means two moles of water molecule is produce from one mole of magnesium hydroxide.

So, number of moles of water molecules produced from  1. 5 mole of magnesium hydroxide = 1. 5 mole× 2 = 3 moles

Therefore,  number of moles of water molecules produced from  1. 5 mole of magnesium hydroxide is 3 moles.

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It should be remembered that the mole fraction of any component making up a system is 1.

the proportion of the moles of one component to the total moles of all the components in a solution or other mixture.

The ratio of molecules of one component in a mixture is known as a mole fraction. For instance, if the methane mole fraction in a gas is 0.90, then this implies that 90% of the molecules are methane. The mixture also contains 90% methane since the amount fractions resemble mole fractions.

By dividing the moles of the solute by the total moles of the substances in the solution, you may determine the mole fraction of the solute.

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The saturation mixing ratio for this parcel is 3.5

The value of the mixing ratio of saturated air at the specified temperature and pressure; a thermodynamic function of the state.

A thermodynamic diagram can be used to directly read this value. The saturation mixing ratio speaks of saturation in relation to a plane surface of pure water without any other qualifier. Additionally, saturation mixing ratios can be defined in relation to a flat ice surface.

The mass of water vapor to the mass of dry air (Md) in a parcel of air at saturation is known as the saturation mixing ratio. In other words, the saturation mixing ratio is the most water vapor a package can contain without condensing. The saturation mixing ratio on the Skew-T is represented by the mixing ratio line that passes through the temperature.

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Answer:

Within each group of metals, reactivity increases as you go down the group. The valence electrons are less tightly bound and easier to remove, because they are farther away from the nucleus of the atom. A nonmetal tends to attract additional valence electrons to attain a full valence shell.

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After eliminating common terms, the net reaction occurs when we combine the reactions of an acid protonating water and its conjugate base deprotonating water is the autoionization of water.

The autoionization of water demonstrates that water can react with itself because acids and bases should interact with one another.

Here, the sound should be strange. Additionally, the water molecules should experience a small degree of proton exchange.

Thus, the correct option is c. The autoionization of water.

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The question is complete. Your complete question is given below:

a. The acid-base reaction between the acid and its conjugate base.

b. The synthesis of a complex between the acid and its conjugate base.

c. The autoionization of water.

d. None of the above.

An acute effect is an immediate or rapid harmful reaction to a exposure.

A chronic effect is a permanent/ long-lasting consequence from exposure to a single dose or to repeated lower doses of a harmful substance.

What is an acute effect?

Acute (short-term) effects show up immediately or soon after exposure to the chemical. They may be minor, like nose or throat irritation, or they could be serious, like eye damage or passing out from chemical vapors. It is an adverse effect on a human or animal body, with severe symptoms developing rapidly and coming quickly to a crisis.

What is a acute effect example?

Examples of acute health effects include dizziness, skin irritation, and throat irritation. Keep in mind that a chemical may cause both acute and chronic effects.

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The observation is the evolution of carbon dioxide gas.

Sodium hydrogen carbonate is a base while lemon juice contains an acid known as citric acid.

Thus, the reaction in the illustration is involving an acid and a base.

Sodium hydrogen carbonate goes by the formula: NaHCO₃

Citric acid goes by the formula: C₆H₈O₇

The reaction between the two goes thus:

[tex]3 NaHCO_3 + C_6H_8O_7 --- > 3 H_2O + 3 CO_2 + Na_3C_6H_5O_7[/tex]

The carbon dioxide gas is evolved from the reaction vessel in the form of bubbles.

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Toluene compound reacts third fastest with fuming sulfuric acid.

The reaction is attached in figure -

What is toluene?

What is a toluene used for?

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Answer:

D

Explanation:

Gamma radiation penetrates the cell wall of prokaryotic organisms such as bacteria and can inhibit their metabolic functions as well as destroy their DNA.

Debunking the other answers:

A is incorrect as Gamma radiation is used in the treatment of cancer via radiotherapy.

B is incorrect as Gamma rays are too small and would just penetrate any smoke particles.

C is incorrect because Gamma rays are used to disinfect food products to prevent food borne illness. Irradiation is safe to use on food and does not make it radioactive.

Thus, D is correct.

In the malate–aspartate shuttle, electrons are transferred from oxaloacetate to form malate.

A crucial mechanism employed by mitochondria, the malate-aspartate shuttle system, also known as the malate shuttle, enables electrons to pass through the impermeable membrane separating the cytosol as well as the mitochondrial matrix. Glycolysis produces the electrons which are required for oxidative phosphorylation.

The liver, heart, as well as kidney, include the malate-aspartate shuttle, which produces about three molecules of ATP for every cytosolic NADH molecule.  Under aerobic conditions, it constitutes quantitatively the most significant shuttle for such reoxidation of cytosolic NADH in vertebrate tissues.

Therefore, In the malate–aspartate shuttle, electrons are transferred from oxaloacetate to form malate.

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The pH of a 0.250m solution of succinic acid is 2.42.

Succinic acid is one of the naturally occurring dicarboxylic acid having four carbon, which is produced by LPG.

It can be used in many chemical, food, and pharmaceutical industries.

Given,

pKa = 4.21

As we know that,

pKa = - logKa

4.21 = -logKa

Ka = antilog(-4.21)

Ka = 6.1 × 10^(-5)

Now, let the concentration of [H+] = [A-] = x

Ka = [H+] [A-] /[HA]

6.1 × 10^(-5) = x^2/ (0.25-x)

x^2 = 1.52 × 10^(-5)

x = 3.89 × 10^(-3)

Thus, the concentration of [H+] = [A-] = 3.89 × 10^(-3).

Now, we will calculate the value of pH

pH = - log[H+]

pH = -log(3.89 × 10^(-3))

pH = 2.42

Thus, we found that the pH of the given solution is 2.42.

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An atom which an electron moves from the first to the third shell atom absorbs more energy.

An atoms may occupy different energy states . The energy states are discrete , that means they occur at specific values only. Therefore an atom can only move to a new energy level if it absorbs or emits an amount of energy that exactly corresponds to the difference between two energy levels.

The lowest possible energy levels that the atom can occupy is called ground state.The energy levels which is higher to the ground state is called excited state.

The more energy absorb when electron move from first to third because in this second energy level have to pass to reach at third energy level.

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Answer:

Explanation:

Hope It Helps!!!!

Answer:

See belwo

Explanation:

First it becomes a compressed gas.... further pressure will cause it to condense into a liquid.

The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0 grams. The percent yield of the reaction is 56 %.

The amount can be produced from the correct computation is called Theoretical Yield.

The actual amount which is produced in the experiment is called Actual Yield.

To calculate the percentage yield use the formula

[tex]\text{Percentage Yield} = \frac{\text{Actual Yield}}{\text{Theoretical Yield}} \times 100 \%[/tex]

Here,

Actual yield = 42 grams

Theoretical yield = 75 grams

Put the value in above expression we get

[tex]\text{Percentage Yield} = \frac{\text{Actual Yield}}{\text{Theoretical Yield}} \times 100 \%[/tex]

                          [tex]= \frac{42\ g}{75\ g} \times 100 \%[/tex]

                          = 56 %

Thus from the above conclusion we can say that The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0 grams. The percent yield of the reaction is 56 %.

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0.56 V  is the standard potential, e∘cell∘, for this galvanic cell.

The standard reduction potential can be calculated by subtracting the standard reduction potential for the reaction occurring at the cathode from the standard reduction potential for the reaction occurring at the anode. The minus sign is necessary because oxidation is the polar opposite of reduction. The total cell potential can be calculated using the formula E0cell=E0red+E0oxid. Step two is to find a solution. Before the two reactions may be integrated, the number of electrons gained in the reduction must match the number of electrons lost in the oxidation

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The standard potential for the given galvanic cell is 0.477 V

The electrode potential is the electromotive force of a galvanic cell built using a standard reference electrode and another electrode whose potential is to be found.

There are two types of electrode potential

Oxidation potential - The potential associated with oxidation reaction is known as oxidation potential

Reduction potential - The potential associated with reduction reaction is known as reduction potential

At the anode, oxidation occurs

[tex]Sn(s)\rightarrow Sn^{2+}(aq)+2e^-[/tex]

At the cathode, reduction occurs

[tex]Cu^{2+}(aq)+2e^-\rightarrow Cu(s)[/tex]

[tex]E^o_{cell} =E^o_{cathode} -E^o_{anode}[/tex]

        = 0.337 - (-0.140)

        = 0.477 V

Thus, The standard potential for the given galvanic cell is 0.477 V

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Disclaimer: The question was given incomplete on the portal. Here is the complete question

Question: What is the standard potential, E∘cell, for this galvanic cell? Use the given standard reduction potentials in your calculation as appropriate.

[tex]Sn^{2+}(aq)+2e^-\rightarrow Sn(s)[/tex], E°red=−0.140 V

[tex]Cu^{2+}(aq)+2e^-\rightarrow Cu(s)[/tex], E°red=+0.337 V

The pH of the solution is 12.88.

millimoles of NaOH = volume x Molarity

                                 = 24.00 mL x 0.25 M

                                 = 6.00 mmole

millimoles of HCl = 24.00 mL x 0.10 M

                            = 2.40 mmole

Total volume = 48.00 mL

                            NaOH + HCl   →     NaCl + H2O

initial                       6.00      0               0         0

added                                 2.40

change                   -2.40  -2.40      +2.40  +2.40

equilibrium               3.60    0           2.40    2.40

The pH is determined by the excess of NaOH present.

[NaOH] = millimoles/volume

            = 3.60/48.00

            = 0.075 M

pOH = -log (OH⁻).

        = -log (0.075)

        = 1.12

Then

pH + pOH = pKw = 14.00.

pH = 14 - pOH

pH = 14 - 1.12

pH = 12.88

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0.014559 g/cm³ is the surface area that covered in square.

Definition of surface area -

The surface area is calculated as -

Conversion of units -

[tex]26 m * \frac{100 cm}{1 m} = 2600 cm[/tex]

[tex]279 kg * \frac{1g}{1000 kg} = 0.279 g[/tex]

[tex]0.0015 mm * \frac{0.1 cm}{1mm} = 0.00015 cm[/tex]

Now we use formula for volume -

      [tex]Volume = \frac{mass}{density}[/tex]

                   [tex]= \frac{0.279 g}{19.3 g/ cm^{3} }[/tex]

                  = 0.014559 g/cm³

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When a substance is entering a phase change, the gain or loss of heat is a result of energy gained or lost in forming or breaking intermolecular interaction.

The constant temperatures occur when a substance is undergoing a phase transition.  If heat is removed from a substance , such as in freezing and condensation , then the process is exothermic . In this instance , heat is decreasing the speed of the molecules causing then move slower.

Example : liquid to solid and gas to liquid .

These changes release heat to the surrounding.

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Since there is an equal number of each element in the reactants and products of 3H2SO4 + 2B(OH)3 = B2(SO4)3 + 6H2O, the equation is balanced.

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The sample response given in the question is right. Displacement is the shortest distance between the initial and final points of a body. Distance is the length of actual path of the body between initial and final positions.

To find the answer, we need to know more about the distance and displacement.

Thus, we can conclude that the given sample response is right.

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The conversion of the fatty acid palmitate (C-16) to carbon dioxide via β-oxidation, the citric acid cycle and oxidative phosphorylation yield approximately 106 atp equivalents.

The most prevalent kind of fatty acid with sixteen carbon atoms without carbon-carbon double bonds would be palmitic acid. There must be a maximum of seven cycles of beta-oxidation in order to totally degrade the fatty acid. 8 acetyl-CoA molecules, 7 NADH molecules, with 7 FADH2 molecules are produced as a result of this.

The primary enzyme, CAT-1, catalyzes the production of acylcarnitine carnitine, which provides the rate-limiting step in beta-oxidation.

Therefore, the conversion of the fatty acid palmitate (C-16) to carbon dioxide via β-oxidation, the citric acid cycle and oxidative phosphorylation yield approximately 106 atp equivalents.

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The volume required to precipitate 0.7l of 0.13 m BaCl2 is 0.04L.

we use

Molarity =Moles of solute / volume of solution (in litre)

Now, for barium ions

Given,

Molarity of solution = 0.13 m

Volume of solution = 0.7L

By substituting all the value ,we have

Moles of Barium = 0.7 × 0.13

= 0.091

BaSO4 » Ba2+ + So2-

By stoichiometry of equation

1 mole of sulphate ion precipitate 1 mole of barium ion

So, 0.091 mole of sulphate ion precipitate

0.091 of moles of Barium ion

Now, calculate the volume of ions by using equation as given above

Mole of sulphate ion = 0.091 mol

Molarity concentration of sulphate ions = 0.05m

By substituting all value , we get

C = n / V

V = n/ C

= 0.091 / 0.5 = 0.04L

Thus, we calculated that the volume required to precipitate 0.7l of 0.13 m BaCl2 is 0.04L.

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The pH of the solution is 9.14

To calculate the amount of hydrogen gas collected, we use the equation given by ideal gas which follows:

PV = nRT

P= Pressure of the gas = 735 torr

V= volume of the gas = 7.70 l

T= Temperature of the gas= 22°C (22+273K) = 295K

R= Gas constant= 62.364 L torr/mol/K

n = number of moles of ammonia = ?

By substituting the values in the above equation, we get:

735×7.70 = n × 62.364 × 295

5659.5 = n × 18397.38

n= 5659.5/18397.38

n= 0.3076

To calculate the number of moles for given molarity, we use the equation:

Molarity of the solution = [tex]\frac{moles of solute}{volume of solution}[/tex]

Molarity of hydrochloric acid = 0.400 M

Volume of solution = 0.250 L

Putting values in above equation, we get:

0.400= moles of solute/0.250

moles of hydrochloric acid = 0.1 mol

The chemical reaction for ethylamine and HCl follows the equation:

NH3+HCl---> NH4Cl

Initial:         0.316             0.18

Final:          0.136     -            0.18

volume of the solution = 0.250 l

To calculate the pOH of basic buffer, we use the equation given by Henderson Hasselbalch:

pOH = pKb + log([tex]\frac{salt}{base}[/tex])

pOH = pKb + log([tex]\frac{NH4Cl}{NH3}[/tex])

it is given:

pKb =  negative logarithm of base dissociation constant of ammonia =

-log(1.8 × [tex]10^{-5}[/tex]) = 4.74

[NH4Cl] = 0.18/0.450

[NH3] = 0.136/0.450

On substituting the values we get,

pOH= 4.74 + log ([tex]\frac{0.18/0.250}{0.136/0.250}[/tex])

pOH = 4.74 + 0.12

pOH= 4.86

pH + pOH= 14

pH= 14-pOH

    = 14-4.86

pH = 9.14

pH of the solution = 9.14

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According to Boyle's law, If one halves the volume of a constant amount of gas at a constant temperature, the pressure will be doubled.

Boyle's law is one of the gas laws that states that the pressure of an ideal gas is inversely proportional to its volume at constant temperature.

Boyle's law equation can be represented as follows:

P = KV

This law suggests that as the pressure of a gas increases, the volume decreases.

Therefore, in accordance with Boyle's law, If one halves the volume of a constant amount of gas at a constant temperature, the pressure will increase times 2 or double.

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