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The amount that could cause death in a 150 pound person is 675000 mg.

We define the LD 50 as the amount of the substance that could be used to cause mortality in about 50 percent of the population that is undergoing the test. In this case, we have been told that the  LD50 for Allura Red ingested for rats and rabbits is 10,000 mg/kg  an now we are asked for the LD 50 in a person that has a weight of 150-lb.

The first step in the work is to convert the mass of the person from pound to kilogram from here;

Given that

1 pound =  0.45 kilo gram

150 pounds = 150 pounds * 0.45 kilo gram/1 pound

= 67.5 Kg

Now, If

10,000 mg causes mortality in 1 Kg

x mg would cause mortality in 67.5 Kg

x = 675000 mg

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Acetyl group, oxaloacetic acid, coA, citric acid, and other elements are the substates and products required to initiate and finish the TCA cycle.

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The heat of formation of the chlorine tri fluorde is  -1513 kJ.

The enthalpy refers to the heat that is absorbed or emitted in a reaction. We know that if the heat is absorbed the enthalpy of the reaction is positive but if heat is evolved, the enthalpy of the reaction is negative.

Now we can find the heat of the formation of chlorine tri fluoride a follows;

We have to use the formula;

Sum of enthalpy of formation of products - Sum of enthalpy of formation of reactants

-1196 =(0 + 271 + 0) - (x + (- 46))

-1196 = 271 - x + 46

-1196 = 317 - x

x = -1196  - 317

x = -1513 kJ

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Missing parts;

Consider the reaction 2ClF3 (g) + 2NH3 (g) → 6HF (g) + N2 (g) + Cl2 (g) △H-_1196 kJ Given the following enthalpies of formation, calculate AHf for CIF3 (9) NH3 (g)- 46 kJ/mol HF 9)271 kJ/mol kJ

1) The rate at which this reaction occurs is obtained as  9.22 * 10^-5 s-1

2) The time that the reaction takes is obtained as 15033 s

3) The initial reaction rate is 9.22 * 10^-5 M

To obtain the rate of reaction is to find the rate at which the reactants move on to become products.

In this case there is  reduction of the amount by 25% in 52 min.

Hence;

Using the approach of first order kinetics;

ln[A] = -kt + ln[A]0

k = -(ln[A] -  ln[A]0)/t

k = - (ln0.75 [A]o/A]0)/3120

k = 9.22 * 10^-5 s-1

b) It was given in the question that;

[A] =  [A]o - 0.75  [A]o = 0.25 [A]o

ln[A] = -kt + ln[A]0

t = -(ln[A] -  ln[A]0)/k

t = - (ln0.25 [A]o/A]0)/9.22 * 10^-5

t = 15033 s

c) When the initial rate is is 2.5 mol/L·s

k = - (ln0.25 (2.5)/ln(2.5))/15033

k = 9.22 * 10^-5 M

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The electron configuration 1s² 2s²2p6 is the element Neon.

One orbital may house a maximum of two electrons, and there are four different types of orbitals (s, p, d, and f). More electrons can be held in the p, d, and f orbitals since they contain various sublevels. As was said, each element's location on the periodic table determines the specific electron configuration of that element.

The octet rule states that an atom's outermost shell may hold no more than 8 electrons (except K shell which can accommodate maximum 2 electrons). Hence, potassium's electrical structure.

The quantity of valance electrons, which take part in the creation of a chemical bond, is found in an atom's outermost shell. The outermost shell of the atom's electrical structure contains 4 valance electrons.

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The concentration of the original HBr solution that has 25.0 mL solution neutralized with 13.7 mL of 0.230 M Ba(OH)₂ is 0.126M.

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

Molarity can be calculated by using the following formula;

C₁V₁ = C₂V₂

Where;

According to this question, 25.0 mL solution of HBr is neutralized with 13.7 mL of 0.230 M Ba(OH)₂. The original concentration can be calculated as follows:

25 × x = 0.230 × 13.7

25x = 3.151

x = 0.126M

Therefore, 0.126M is the concentration of HBr solution.

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Answer

B.

Explanation

The diagram shown below correctly shades the S, P, D, F-block of the periodic table:

Comparing the above with the given options, the diagram which correctly shades the f-block of the periodic table in blue will be option B:

The relative atomic masses of the elements are:

Lead = 206.96 amu

Magnesium =  24.62 amu

Silicon = 28.08 amu

The relative atomic masses of the given elements from their isotopes is determined as follows:

1. Lead:

Relative atomic mass = (203.973 * 0.014) + (205.974 * 0.236) + (206.759 * 0.226) + (207.9766 * 0.523)

Relative atomic mass = 206.96 amu

2. Magnesium:

Relative atomic mass = (23.985 * 79.99) + (24.986 * 10%) + (25.983 * 11.01%)

Relative atomic mass = 24.62 amu

3. Silicon:

Relative atomic mass = (27.977 * 92.21%) + (28.976 * 4.70%) + (29.973 * 3.09%)

Relative atomic mass = 28.08 amu

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The molarity of carbonic acid is 0.063M when titration is done between 47.00mL carbonic acid and 23.82mL of 0.1250M ammonium hydroxide.

Titration is a technique by which we know the concentration of unknown solution using titration of this solution with solution whose concentration is known. To know the end point we use phenolphthalein as indicator. End point is a point where completion of reaction happen

Mathematically

moles or carbonic acid =moles of ammonium hydroxide

[tex]M_{1} V_{1} =M_{2} V_{2} \\M_{1} =Molarity of carbonic acid\\V_{1} =Volume of carbonic acid\\M_{2} =Molarity of ammonium hydroxide\\V_{2} =Volume of ammonium hydroxide[/tex]

Substituting all values

[tex]M_{1}[/tex]=(0.1250×23.82)÷47.00

[tex]M_{1}[/tex]=0.063M

Thus the molarity of carbonic acid is 0.063M

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Considering the definition of molality, the molality of a solution that contain 82.6g of butane dissolved in 0.500kg of hexane is 2.84 moles/kg.

Molality is a measure of chemical concentration that indicates the amount of a substance dissolved in a given mass of solvent.

In other words, molality is the number of moles of solute that are dissolved in 1 kilogram of solvent.

The Molality of a solution is determined by the expression:

molality= number of moles of solute÷ kilograms of solvent

Molality is expressed in units moles/kg.

In this case, you know:

Replacing in the definition of molality:

molality= 1.42 moles÷ 0.500 kg

Solving:

molality= 2.84 moles/kg

Finally, the molality of the solution is 2.84 moles/kg.

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The percent by mass of potassium chlorate in the mixture is 62.46 %

Potassium chlorate is a compound containing potassium, chlorine and oxygen, with the molecular formulation KClO₃. In its natural form, it is a white crystalline substance. After sodium chlorate, it's far the second one maximum not unusual chlorate in commercial use.

Potassium chloride, also referred to as potassium salt, is used as a medicine to treat and prevent low blood potassium. Low blood potassium may also occur due to vomiting, diarrhea, or certain medications.

A aggregate is a material made of two or more extraordinary chemical materials which are not chemically bonded. A combination is the bodily aggregate of two or greater substances wherein the identities are retained and are combined in the shape of answers, suspensions and colloids

KClO₃ + KCl = 9.47 gram   ---------  sample before heating

KClO₃ + KCl = 7.11 gram      ----------  sample mass after heating

mass of oxygen = 9.47 - 7.11 = 2.36 gram

Therefore mass of KClO₃ in an mixture is = 7.11/2 + 2.36

                                                                     = 5.915 gram

Therefore, the percent by mass of potassium chlorate in the mixture = 5.915/9.47 × 100

= 62.46 %

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To convert 100.0 g of water at 20.0 °C to steam at 100.0 °C requires 259.5 kJ of energy.

For this problem, there are only two heats to consider:

q

1

= heat required to warm the water from 20.0 °C to 100.0 °C.

q

2

= heat required to vapourize the water to steam at 100 °C.

q

1

=

m

c

Δ

T

=

100.0 g × 4.184 J

∘

C

−

1

g

−

1

×

80.0

∘

C

=

33 472 J

q

2

=

m

Δ

H

vap

=

100.0 g × 2260 J⋅g

−

1

=

226 000 J

q

1

+

q

2

=

( 33 472 + 226 000) J = 259 472 J = 259.5 kJ

(4 significant figures)

v/v Concentration is a type of concentration in which we use to determine what would be the percentage of a certain volume of solute (the one with the least volume) by a certain volume of solution (the one with the most volume). The formula for this will be:

%v/v = volume of solute/volume of solution

In this question, we have:

%v/v = 8.7%, which is 0.087

volume of solute = 34.2 mL

Now we add these values into the formula:

0.087 = 34.2/v

v * 0.087 = 34.2

v = 34.2/0.087

v = 393 mL of ethanol solution that contains 34.2 mL of ethanol

Color is a physical property of matter related to a material’s ability to reflect light.

Color is a physical property of chemicals that in most cases comes from the excitation of electrons due to an absorption of energy performed by the chemical.

Color is that portion of the visible spectrum of light that is reflected back from a surface. A color can only be observed in the presence of light.

When light hits a surface, the particles of the object absorbs the colors in the light. However, not all colours are absorbed by the surface as some are reflected. The reflected color is seen as the color of that object.

The color of light coming from an object is what gives it color. Light travels into the eye to the retina located on the back of the eye. The human eye and brain work together to translate light into color.

Therefore, it can be said that a substance's ability to reflect light is color.

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The mass of forsterite Mg₂SiO₄ that contains a million, 1×10⁶ oxygen atoms is 5.819×10⁻¹⁷ g

We'll begin by obtinig the mass of oxygen that contains 1×10⁶ atoms. This can be obtained as follow:

From Avogadro's hypothesis,

6.02×10²³ atoms = 1 mole of oxygen.

But

1 mole of oxygen = 16 g

Thus,

6.02×10²³ atoms = 16 g of oxygen.

Therefore,

1×10⁶ atoms = (1×10⁶ atoms × 16 g) / 6.02×10²³ atoms

1×10⁶ atoms = 2.66×10⁻¹⁷ g of oxygen

Finally, we shall determine the mass of Mg₂SiO₄ that contains 1×10⁶ atoms (i.e 2.66×10⁻¹⁷ g) of oxygen. This can be obtained as follow:

Thus, we can say:

64 g of oxygen is present in 140 g of Mg₂SiO₄.

Therefore,

2.66×10⁻¹⁷ g of oxygen will be present in = (2.66×10⁻¹⁷ × 140) / 64 = 5.819×10⁻¹⁷ g of Mg₂SiO₄

Thus, the mass of Mg₂SiO₄ is 5.819×10⁻¹⁷ g

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To calculate this, we can use fractions for equivalent amounts.

So, we have the number of atoms, using the Avogadro's Constant, we know that 1 mol of Mg is approximately 6.02 x 10^23, so:

And since we have the number of atoms of Mg, we can convert to mol of Mg by multiplying by this fraction.

Now, from mol of Mg we can convert to mass using the molar mass of 24.30 g/mol. It says that 24.30 g og Mg is equivalent to 1 mol, so:

So, we have:

Notice that this is presented in a table in the question, so we can now just multiply all of them:

Thus, this is equivalent of approximately 3.00 g of Mg.

The correct way of presenting the given molecule is CH₄, with the number subscripted.

The subscripted numbers indicates how many of the previous element are in the molecule.

If there are no subscripted number after a given element, it means it is a implicit 1.

So, in CH₄, there is no number after C, so it is implicit it is a 1, and after the H there are a 4. This means that we have 1 C atom and 4 H atoms.

C is carbon and H is hydrogen, so:

A molecule of CH₄ consists of 1 carbon atom and 4 hydrogen atoms.

The energy of the photon is 9.24 * 10^-15 J.

Let us recall that the energy has to do with the product of the frequency and the plank's constant. In thus case, we have the frequency of the photon and we have to find the energy of the photon and we have to do that from the following formula;

E = hf

E = energy of the photon

h = Plan's constant

f = frequency of the photon

Then;

E = 6.6 * 10^-34 Js * 1.4 x 10^19 Hz

E = 9.24 * 10^-15 J

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The 14 elements that make up the S-block are hydrogen (H), lithium (Li), helium (He), sodium (Na), beryllium (Be), potassium (K), magnesium (Mg), rubidium (Rb), calcium (Ca), cesium (Cs), strontium (Sr), francium (Fr), barium (Ba), and radium (Ra).

The Periodic Table's s-block elements are those in which the final electron enters the most outer s-orbital. Only two groups (1 & 2) are found in the s-block of the Periodic Table because the s-orbital can only hold two electrons.

S block elements' common outer electrical configuration is ns(1-2).

Given that it contains sodium, beryllium, magnesium, and lithium, I am rather certain that it contains alkaline metals.

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Answer:

Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process (see the 1ˢᵗ law of thermodynamics).

 Thermodynamics, and many other related fields, phase transitions are the physical processes of transition between a state of a medium, identified by some parameters, and another one, with different values of the parameters.

1. Convection currents are caused by Differences in water density.

2. Feeling heat from a campfire is an example of   heat transfer through convection.

3. Heat always flow from a warmer object to a cooler object.

4. The best description of convection is Heat transfer through movement in fluids.

Differential heating leads to convection currents. Warm, less dense, lighter material rises while cool, more dense, heavier material sinks. Convection currents are patterns of circulation that are produced by this movement in the Earth's mantle, oceans, and atmosphere.

The transfer of heat between two bodies by currents of moving gas or fluid is known as convective heat transfer. In free convection, air or water rises and is replaced by a cooler parcel of air or water as it moves away from the hot body.

Heat energy will always transfer from the warmer object to the cooler object under normal circumstances and in nature. Up until the two substances reach the same temperature, heat energy will transfer between them. The term "thermal equilibrium" describes this.

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Answer:

good question but very hard

An acid-base reaction is a chemical reaction which takes place between an acid and a base. An example of acid-base reaction is AgNO₃(aq) + KF(aq) → AgF(s) + KNO₃(aq). Thus, the correct option is A.

An acid–base reaction is a chemical reaction which occurs between an acid and a base. This reaction can be used to determine the pH through the method of titration.

This reaction is a type of chemical reaction which involves the exchange of one or more hydrogen ions or protons (H⁺) between the two species which may be neutral (such as water, H₂O) or electrically charged species (ions such as ammonium, NH⁴⁺ and hydroxide, OH⁻; or carbonate, CO₃²⁻).

An example of acid-base reaction is  AgNO₃(aq) + KF(aq) → AgF(s) + KNO₃(aq).

Therefore, the correct option is A.

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Period 2 element would the 4th ionization energy be much larger than the 3rd ionization energy is Boron.

Boron belongs to period second. atomic no. of boron is 5 and the electronic configuration is given as :

B₅  =   1s² 2s² 3p₁

The 1st ionization energy = 800.6

the 2nd ionization energy = 2427.1

the 3rd ionization energy = 3659.7

the 4th ionization energy = 25025.8

So. we can see that the 3rd ionization energy is much lower than 4th ionization energy because after removing the 3rd electron from 2s boron will attain the stable electronic configuration of helium. now to remove electron from filled orbital it will require much larger energy the 3rd ionization energy.

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Taking into account the reaction stoichiometry, 1.25 moles of NO are formed from 3.75 moles of NO₂ if there is plenty of water present.

In first place, the balanced reaction is:

3 NO₂ + H₂O  → 2 HNO₃ + NO

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Amount of moles of NO formed

The following rule of three can be applied: if by reaction stoichiometry 3 moles of NO₂ form 1 mole of NO, 3.75 moles of NO₂ form how many moles of NO?

amount of moles of NO= (3.75 moles of NO₂× 1 mole of NO)÷ 3 moles of NO₂

amount of moles of NO= 1.25 moles

Finally, 1.25 moles of NO are formed.

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Carbon, hydrogen, and oxygen are the main components. Glucose has the chemical formula C6H12O6. This indicates that there are six carbon atoms in each glucose molecule.

What is the name of a 6 carbon ring?

Image for number 18 What is the chemical formula of a molecule with 6 carbons, 12 hydrogens, and 1 oxygen? CsH6O12 120g as Josqmos as ed of slunnal; C6H12OH; and C6H11OH, 8C12HO, C7H12O3, and

Aromatic rings are hydrocarbons that contain benzene or another comparable ring structure. They are sometimes referred to as aromatic compounds or arenes. The chemical symbol for benzene, C6H6, is frequently represented as a ring of six carbon atoms with alternate double and single bonds: There are a few issues with this straightforward image, though.

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The pressure inside a tank with a volume can be calculated using Boyle's law. The pressure needed to compress gas of 3700 L is 16.75 atm.

According to Boyle's law the pressure of a system is inversely proportional to its volume. The mathematical expression for a system with pressure Pa and volume  V1 with its final pressure and volume P2 and V2 is written as follows:

P1V1 = P2V2.

The volume of the gas is 3700 L. Assume that it is measured in the atmospheric pressure 1 atm. The width of the spherical tank is 75 cm thus its radius is 37.5 cm.

Volume of the sphere = 4/3 πr³

                                     = 4/3 × 3.14 × (37.5)³

                                     = 220781 cm³ = 220.78 L.

Now the law can be applied as follows:

3700 L ×  1 atm = 220.78 L × P2

P2  = 3700 / 220.78

     = 16.75 atm.

Hence, the pressure needed to fill the air is 16.75 atm.

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According to the chemical equation, the reaction absorbs 54.8 kJ per 2 moles of NH4Cl because that's the stoichiometry coefficient of this molecule.

Now, we need to find the number of moles in each mole of NH4Cl.

Then, we add them to find the molar mass.

This means that 1 mole of NH4Cl equals 53.49 grams.

At last, we multiply the mass of NH4Cl (27.1 g) by two ratios, the first ratio is about the molar mass, and the second ratio is about the amount of heat per moles.

Therefore, the amount of energy that would be absorbed is 13.88 kJ.

Step 1 - Converting ml and quart

As can be seen in the figure, the conversion factor is:

Dividing both sides by 1.057:

Step 2 - Converting 2.55 quart to ml

Now that we know the conversion factor, we just have to multiply both sides by 2.55:

There are thus 2412.47 ml in a 2.55 quart bottle pepsi.

Oxygen have 6 valence electrons. It needs only two electrons to get a full outer shell.

Thus, oxygen will gain two electrons.

To solve this question, we need to use the combined gas equation which is given as

Now we should write down the given data

So, we would use the previous equation i wrote down.

From the calculations above, the final pressure of the gas is 1659.28mmHg