steric number of benzene​

Answer:

1.11 x 10⁻¹⁹ J

Explanation:

To calculate the energy of the light, you need to use one of Einstein's equations:

E = hf

In this equation,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J·s)

-----> f = frequency (Hz)

You can plug the constant and given value into the equation and solve for "E". The final answer should have 3 sig figs like the given value.

E = hf                                                                   <----- Einstein's equation

E = (6.626 x 10⁻³⁴ J·s)(1.68 x 10¹⁴ Hz)                 <----- Insert values

E = 1.11 x 10⁻¹⁹ J                                                  <----- Multiply

The radioactive sample that would contain the greatest remaining mass of the radioactive isotope over 10 years is 4.0 grams of Co-60 because it has the longest half-life.

The half-life of an isotope of an element is directly related to the number of particles remaining over a given period of time. The longer the half-life of an isotope of an element, the greater the number of particles of that element that remain over a given period of time.

The half-life of the given atoms os given below:

Half-life of Au-198 is 2,607 days

Half-life of K-42 is 12.32 hours

Half-life of P-32 is 14.3 days

Half-life of Co-60 is 5.3 years.

Hence, Co-60 has the longest half-life.

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The final pressure of the gas is 914 torr. This is obtained by the use of the ideal gas equation and its parameters.

The ideal gases are those kind of gases to which we can be able to apply the ideal conditions. Let us recall that the laws of the ideal gas pertains to the gases that are in the ideal condition. This implies that the gases are at a low pressure and a high temperature.

Now we have that;

Initial pressure P1 = 735 torr

Final pressure of the gas P2 = ??

Initial temperature of the gas T1  =  6 ∘C or 279 K

Final temperature of the gas T2 =  74 ∘C  or 347 K

Then by the use of the formula;

P1/T1 = P2/T2

P1T2 = P2T1

P2 = P1T2/T1

P2 = 735 *  347 /279

P2 = 914 torr

The pressure that the gas would have at the end of the process is 914 torr.

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The aluminum use for a window frame , copper for wiring and iron for nail because of they are malleable , ductile, good conductor of electricity and high energy efficiency.

The aluminum is used for window because aluminum is malleable and the aluminum have high energy efficiency.  The copper is used as for the wiring because the copper is the good conductor of the electricity. The iron is use for the nail because iron is hard and have the tendency to resist the corrosion.

Thus, The aluminum use for a window frame , copper for wiring and iron for nail because of they are malleable , ductile , good conductor of electricity and high energy efficiency.

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[tex]{ \boxed{ \blue{ \sf{properties \: of \: fullerence}}}}[/tex]

• Man made allotrope of carbon obtained from graphite which when treated with [tex]CS_{2}[/tex]

• sp² hybridised.

• Dark shining and conducts electricity.

• It has 20 hexagonal and 12 pentagonal.

The pressure is 6.215mmHg

Pressure is force per unit area of surface

Here given data is

Initial volume V₁ = 29.1 L

Initial temprature T₁ = 306 K

Initial pressure P₁ = 719 mm Hg

Final volume V₂ = 4.1 L

Final temprature T₂ =  372 K

Final pressure P₂ = ?

We have to find final pressure = ?

So the formula is

P₁V₁/T₁ = P₂V₂/T₂

719 mm Hg×29.1 L/ 306 K = P₂×4.1 L/372 K

68.37 =  P₂×0.011

P₂ = 68.37/0.011

P₂ = 6.215mmHg

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The number of moles of H₂ consumed in the process is 11.14 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions.

The number of moles of a product or reactant can be calculated as follows:

The reaction between oxygen and hydrogen to give water is as follows:

2H₂ + O₂ = 2H₂O

Based on the above equation, 2 moles of hydrogen reacts with 1 mole of oxygen.

Hence, 5.57 moles of oxygen will react with 11.14 moles of hydrogen.

Therefore, 11.14 moles of hydrogen will be produced by 5.57 moles of oxygen.

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The Tricarbon Octasulfide:  number of carbons is 3.

The tricarbon octasulfide is C₃S₈. The tricabon octasulfide contains three carbons in the molecular formula. carbon is the element with the chemical symbol C is place in the group 14 and the period second in the periodic table. the atomic number of carbon is six. tri carbon is an inorganic compound with the chemical formula C₃ having three carbon atoms. carbon is used as the fuel in the form of coal , methane . carbon is a non metal and the state of carbon is solid state at room temperature.

Thus, The Tricarbon Octasulfide:  number of carbons is 3.

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If the temperature of the sample of gas changes from 25°C to 45°C, the volume of the gas will increase.

Charles's law is the gas law stating that the density of an ideal gas is inversely proportional to its temperature at constant pressure.

In other words, the law states the volume of a gas is directly proportional to the temperature of the gas. The equation is given as follows:

V₁/T₁ = V₂/T₂

Where;

According to this question, a sample of a gas at constant pressure increases in temperature from 25°C to 45°C. This means that as the temperature increases, the volume also increases.

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Explanation:

time ➟ second

temperature ➟ Kelvin

ampere ➟ electric current

luminous intensity ➟ candela

mole ➟ amount of a substance

liter ➟ volume

length ➟ meter

Answer:

Explanation:

Kilogramm → mass

Ampere → electric current

Mole → amount of a substance

Liter → volume

Answer:

1.46878825 g O_3

Explanation:

the balanced equation is:

2 KClO_3 = 2 KCl + 3 O_2

using stoichiometry, you can find the amount of O_2 produced from 2.5 g KClO_3

2.5 g KClO_3 x (1 mol / 122.55 g KClO_3) x (3 mol O_3 / 2 mol KClO_3) x (48 g O_3 / 1 mol O_3) = 1.46878825 g O_3

114.5 g is the total mass of the beaker .

Total mass of beaker=53.10g+5.348g+ 56.1g

Total mass=114.5 g

Mass is used in physics to specific inertia, a fundamental function of all remember. basically, it's far a mass of rely's resistance to changing its course or pace in response to the software of a force.

The exchange that an applied force produces is smaller the extra mass a body has. The kilogram, the unit of mass within the international machine of gadgets, corresponds to 6.62607015 1034 joule seconds using Planck's consistent (SI). One joule is produced by way of multiplying one kilogram by means of one rectangular meter per 2d.

The kilogram is decided by genuine measurements of Planck's regular on account that the second one and the meter have formerly been described in phrases of other bodily constants.

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The rock sample on the left is basalt, a type of igneous rock. Heat and intense pressure changed the basalt into blueschist, a type of metamorphic rock glaucophane schist

Blueschist facies is determined by the particular temprature and pressure condition required to metamorphose basalt to form blueschist and felsic rock and pelitic sediment which are subjected to blueschist facies condition will form different mineral assemblages then metamorphosed and blueschist facies rock are generally formed in subduction zones where oceanic crust is being stuffed into a trench that will become true blueschist once they were pressure cooked and also called glaucophane schist and is a metavolcanic rock that with similar composition at high pressure and low temprature

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The quantity of heat energy evolved in the reaction, given that 0.25 mole of KCl is mixed with 0.25 mole of NaOH in a calorimeter is 2830.5 calories

To obtain the heat energy evolved, we shall begin by obtaining change in the temperature of the water. This is obtained as follow:

ΔT = T₂ - T₁

ΔT = 35.5 - 27

ΔT = 8.5 °C

Finally, we shall determine the quantity of heat energy evolved in the reaction. Details below

Q = MCΔT

Q = 3.33×10² × 1 × 8.5

Q = 2830.5 calories

Thus, the quantity of heat energy evolved is 2830.5 calories

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Explanation:

highest principal quantum number of the elements in the period

A periods number on the periodic table corresponds to the number of principal quantum number.

What does principal quantum number signify?

The orbit or shell in which an electron is placed in relation to the atom's nucleus is described by its primary quantum number.

Hence, Each period in the periodic table corresponds to a principal energy level.

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The Law of conservation of mass states that  option C: matter is neither created nor destroyed.

Physical and chemical changes can cause matter to transform into different forms, but no matter what happens, matter is always conserved. There is no creation or destruction of matter; the amount of matter is the same before and after the transformation.

The principle of matter conservation. argues that matter cannot be generated or destroyed during a chemical reaction. The same number of atoms exist before and after the alterations even though the matter may shift from one form to another. reactant.

Therefore, According to the principle of mass conservation, neither chemical processes nor physical changes can create or destroy mass in an isolated system. The mass of the products and reactants of a chemical reaction must be equal, in accordance with the law of conservation of mass.

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See full question below

1. Multiple-choice

Q.

Conservation of matter article questions

Law of conservation of mass states that

answer choices

matter is created

matter is destroyed

matter is neither created nor destroyed

matter does not change

The color of the solution after reaching a pH of 8 is pink.

In the process of titration of acetic acid with aqueous NaOH, phenolphthalein is used as an indicator. Phenolphthalein is nearly colorless in acidic solutions, but it turns the solution into pink at a pH of 8.

As you titrate vinegar, we can observe that the pink color is more persistent as we add more base. When a faint pink color persists for at least 30 seconds, we can understand that the endpoint has been reached.

The pH scale ranges between 0 - 14, if the pH is below 7 it indicates acidic, if it is exactly 7 then it indicates neutral and if it is greater than 7 it indicates a base.

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Answer:

3

Explanation:

at first try balancing the carbon first. At first multiply 2 with CO2, that produces 2 carbon and 8 oxygen. On reactant side we have 3 Oxygen. Now look at Hydrogen. There are 6 hydrogen atoms on the reactant side. So you need to multiply 3 with H20 to be 6 hydrogen atoms as 3*2 = 6.

Final reaction: C2H5OH + 3O2 ------> 2CO2 + 3H2O

The volume (in milliliters) occupied by a 0.327 g sample of CO₂ gas at 22.5 °C and 755 Torr is 0.115 L.

The ideal gas equation is given as :

P V = n RT

where,

P = pressure = 755 torr = 0.99 atm

V = volume

n = moles

R = gas constant = 0.0821 atm L / mol K

T = temperature = 273 + 22.5 = 295.5 K

mass of CO₂  = 0.327 g

molar mass of CO₂  = 44 g

number of moles of CO₂  = mass / molar mass

                                          = 0.327 / 44

                                          = 0.0047 mol

P V = n R T

V = (n RT) / P

V = ( 0.0047 × 0.0821 × 295.5 ) / 0.99

V = 0.115 L

Thus, The volume (in milliliters) occupied by a 0.327 g sample of CO₂ gas at 22.5 °C and 755 Torr is 0.115 L.

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Option B: an open system

Explanation:

Explanation:

Nucleons can be either protons or neutrons contained in an atom, and since Carbon-14, has a mass number of 14, it is evident that it contains 14 nucleons, as the mass number of an element is the sum of the protons and neutrons of an element

How does the arrangement of the molecules differ in each state of matter?

Particles in a: gas is well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

How will you differentiate the compressibility of the three phases of matter?

Compressibility: It is the property of matter in which its volume is decreased by applying force.

Thus, different states of matter are affected by the arrangement of molecules.

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Answer:

Put a coefficient of 2 in front of P4. Then a coefficient of 6 in front of O2. Then a coefficient of 4 in front of P2O3.

Explanation:

This is a synthesis reaction because of the two different atoms form a compound

The number of moles of O₂ required to react with 3.6 moles of C₂H₄O₃ is 5.4 moles

First, let us observed the balanced equation, to what we can obtain. This is shown below

2C₂H₄O₃ + 3O₂ -> 4CO₂ + 4H₂O

From the balanced equation above,

2 moles of C₂H₄O₃ reacted with 3 moles of O₂

With the above information from the balanced equation, we can determine the number of moles of O₂ required to react with 3.6 moles of C₂H₄O₃. This can be obtained as follow:

From the balanced equation above,

2 moles of C₂H₄O₃ reacted with 3 moles of O₂

Therefore,

3.6 moles of C₂H₄O₃ will react with = (3.6 × 3) / 2 = 5.4 moles of O₂

Thus, number of mole of O₂ required is 5.4 moles

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Explanation:

The lower jaw (mandible), which also shapes the lower face and chin, supports the bottom row of teeth. The bone that moves when the mouth opens and shuts is this one. The upper jaw's (maxilla) function is to support the nose, hold the upper teeth, and shape the middle of the face.

In Period 3 and Group 16, Sulfur is present and has the element symbol is ''S''.

Sulfur is a chemical element having the symbol S and its atomic number 16 and belongs to group 16. It is abundant around the world and nonmetallic under normal conditions. Sulfur element is used in the vulcanization of black rubber such as a fungicide and black gunpowder. Most element of sulfur is used in the production of acid known as sulfuric acid, which is the most important chemical produced by civilizations of the west.

Element of sulfur is lowly toxic to people but ingesting too much sulfur may cause a burning effect or diarrhea. Breathing in sulfur dust can damage the airways or cause coughing. It can irritate to the skin and eyes of a person.

So we can conclude that Sulfur is the element that is located in Period 3 and Group 16.

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There are moles of Mn in a sample of Mn that contains 3.80 × 10²⁴ atom is 6.31 moles.

The number of moles in a substance can be calculated by dividing the number of atoms of that substance by Avogadro's number, which is equivalent to 6.02 × 10²³ atoms.

No of moles = no of atoms ÷ 6.02 × 10²³

According to this question, there are 3.80 × 10²⁴ atoms in manganese element. The number of moles in this substance is as follows:

no of moles = 3.80 × 10²⁴ ÷ 6.02 × 10²³

no of moles = 6.31 moles

Therefore, 6.31 moles is present in 3.80 × 10²⁴ atoms of manganese.

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The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.

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

Empirical formula = CH₂O

Molar mass of compound = 150 g/mol

Scaling factor (n) =?

Empirical formula × n = molar mass

[CH₂O]n = 150

[12 + (2×1) + 16]n = 150

[12 + 2 + 16]n = 150

30n = 150

Divide both sides by 30

n = 5

Therefore, the scaling factor is 5

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Trace evidence in the above case refers to the piece of the suspect’s hair that was found on the victim’s body.

Trace Evidence Analysis is the field  of forensic science that deals with the minute transfers of materials that cannot be seen with the human eye. The handling and analysis of trace evidence requires care and specialized techniques. Trace evidence may provide a link between the victim and a suspect, a victim and a scene, or the suspect and a scene.

Thus with the help of trace trace evidence we can identity the suspect.

It is not uncommon for people to shed hair throughout the day.  The ease of transfer of this type of evidence makes it very useful in criminal investigation.  Forensic testing of hairs involves identification of human versus animal hair and also the comparison of microscopic features to differentiate between hairs from different individuals.  Once comparison is completed, hair with follicular tags can be sent to the Nuclear DNA Unit for analysis.

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The empirical formula of the metal bromide, given that 22.46 grams sample of cobalt is heated in the presence of excess bromine is CoBr₃

We'll begin by obtaining the mass of bromine in the compound. This can be obtained as follow:

Mass of bromine = (Mass of metal bromide) - (Mass of cobalt)

Mass of bromine = 113.8 - 22.46

Mass of bromine = 91.34 grams

Finally, we shall determine the empirical formula of the metal bromide. Details below:

Divide by their molar mass

Co = 22.46 / 58.9 = 0.381

Br = 91.34 / 79.9 = 1.143

Divide by the smallest

Co = 0.381 / 0.381 = 1

Br = 1.143 / 0.381 = 3

Thus, we can conclude that the empirical formula of the metal bromide is CoBr₃

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