Write down as many as you can uses for liquid crystall

Answer:

37,818.67 m3

Explanation:

The pressure a gas will exert on a container is inversely proportional to the volume of the gas. According to Boyle's law, at a constant temperature, the pressure of a gas is inversely proportional to its volume. The law can be mathematically represented thus:

   P1V1 = P2V2

In this case, P1 = 101.3 kPa, V1 = 28,000 m3, P2 = 75 kPa, V2 = ?

V2 = P1V1/P2

         =    101.3 x 28,000/75

                = 37,818.67 m3

Hence, the new volume of the air inside the cabin after pressurizing would be 37,818.67 m3.

The grams of the reactant that were consumed will be 2g

The Law of Conservation of Mass by Antoine Lavoisier states that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

According to the law we understand that mass is neither created nor destroyed. So, if 2 grams of product are produced, then the mass of reactants consumed will also be equal to 2 grams.

Hence if 2 grams of product is produced by the chemical reaction, 2 grams of reactants are consumed.

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Answer:

respritory and circulatory systems

lungs and heart

Explanation:

The boiling point of a liquid can be estimated from its vapor pressure using the Clausius-Clapeyron equation.

This equation relates the vapor pressure of a liquid to its boiling point and can be expressed as:

ln(P2/P1) = -ΔHvap/R * (1/T2 - 1/T1)

where P1 is the vapor pressure at temperature T1, P2 is the vapor pressure at temperature T2, ΔHvap is the enthalpy of vaporization, R is the gas constant, and ln denotes the natural logarithm.

To find the boiling point, you would need to know the vapor pressure at two temperatures and the enthalpy of vaporization. Rearranging the equation to solve for the boiling point, you would get:

T2 = -ΔHvap/R * (1/(ln(P2/P1)) + 1/T1)

Substituting the values of P1, P2, and T1 into the equation and solving for T2 will give you an estimate of the boiling point. Note that this equation is an approximation and assumes that the enthalpy of vaporization is constant over the temperature range of interest.

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A 20% solution can be made from 45g of NaCl by:

d. 225 mL

To determine how much of a 20% solution can be made from 45g of NaCl, we need to calculate the volume of the solution.

First, we need to understand that a 20% solution refers to 20 grams of NaCl dissolved in 100 milliliters of solution. This means that in every 100 mL of the solution, 20 grams of NaCl is present.

To find out the volume of the solution that can be made from 45g of NaCl, we can set up a proportion:

20 grams / 100 mL = 45 grams / X mL

Cross-multiplying the values, we get:

20 grams * X mL = 45 grams * 100 mL

Simplifying the equation:

20X = 4500

Dividing both sides by 20:

X = 4500 / 20

X = 225

Therefore, the volume of a 20% NaCl solution that can be made from 45g of NaCl is 225 mL.

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The formula for the compound that forms between lithium and each polyatomic ion is \(Li_{2}CO_{3}\), \(Li_{3}PO_{4}\), \(Li_{2} HPO_{4}\) and \(CH_{3}COOLi\).

A substance made up of two or more different chemical elements together in a certain ratio is known as a compound in chemistry. When the elements interact with one another, chemical bonds are formed that are difficult to break.

Only a few of the elements on the periodic table have a second letter that is lowercase after their initial capital letter. Therefore, you can tell an ion is polyatomic if it contains two capital letters together.

So, from the question

The compound that lithium will form with carbonate is \(Li_{2}CO_{3}\)

The compound that lithium will form with phosphate is \(Li_{3}PO_{4}\)

The compound that lithium will form with hydrogen phosphate is \(Li_{2} HPO_{4}\)

The compound that lithium will form with acetate is \(CH_{3}COOLi\)

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Answer:

none

Explanation:

It is given that there are 3 cats.

Each of the cats die with different diseases. One of cats died due to heart failure, the second cats died because of brain tumor and the third cat died due to an experiment gone wrong.

So there are none of the cats left out. All the cats died due to different reasons.

Answer:

It should be 115.5 amu but you didnt type that as an answer choice so...

Explanation:

Bruh all you had to do was add oxygen and sulfur and subtract from the total to get your answer :D.

The percent yield of the solution is 17.7% that can be calculated by using experimental and theoretical yield.

Moles of silver nitrate = 305/169.87 = 1.8 moles.

Two moles of AgNO₃ will give 0.5 mole of MgNO₃

Therefore the 1.8 moles of AgNO₃ and excess of MgCl will give 0.9 mole of MgNO₃.

Percent yield can be calculated by dividing the actual yield by the theoretical yield multiplied by 100.

Theoretical yield = 0.9 x 148.3= 133.47

= Yield % = (experimental yield / theoretical yield ) x100

=  (23.7/133.47) x 100

= 17.7%

The percent yield of the solution is 17.7%.

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Answer:

Here boron-11 means the name of the element is boron and the mass number is 11

Explanation:

The change of energy of the gas mixture during the reaction is -323 kJ (exothermic release of energy).

The change of energy of the gas mixture during the reaction can be calculated using the First Law of Thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat (q) added to the system minus the work (w) done by the system:

ΔU = q - w

Given the information:

Change in enthalpy (ΔH) = -244 kJ (negative sign indicates exothermic reaction)

Work (w) = 79 kJ

Substitute the values into the equation:

ΔU =\(-244 \, \text{kJ} - 79 \, \text{kJ}\]\)

ΔU = -323 kJ

Therefore, the change of energy of the gas mixture during the reaction is -323 kJ (exothermic release of energy).

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Your question is incomplete but your full question was:

Measurements show that the enthalpy of a mixture of gaseous reactants decreases by 244 KJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that 79.kj of work is done on the mixture during the reaction. Calculate the change of energy of the gas mixture during the reaction in kJ.

The chemical reaction under consideration is exothermic with an enthalpy decrease of 244 kJ. The work done on the system is 79 kJ. The total energy change in the system, or internal energy change, is -165 kJ.

In this chemical reaction analysis, you're dealing with two primary concepts in chemistry: enthalpy and work done on the system. The enthalpy change (ΔH) represents the heat flow in a reaction at constant pressure, which in this case decreased by 244 kJ, meaning heat was released, indicating an exothermic reaction. The work done on the system of gaseous reactants, noted as 79 kJ, is the energy transferred due to a change in the volume of the reaction mixture.

To calculate the total energy change in the system, we use the first law of thermodynamics, which defines the internal energy (ΔU) as ΔU = ΔH - PΔV (where P is the pressure and ΔV is the volume), or alternately ΔU = ΔH - w (where w is work). If the work done is expressed in kJ (since 1 kJ of work corresponds to the system expanding by one litre against a pressure of one atmosphere), the equation can be rearranged to find ΔU, which is calculated as -244 kJ (enthalpy decrease) minus the 79 kJ of work done on the system, giving -165 kJ.

This internal energy change indicates the total amount of energy transferred in the reaction when considering both heat flow (enthalpy change) and volume change (work).

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1) The pH is 10.45

2) The pH is 3.28

The term "potential of hydrogen" (pH) refers to a solution's acidity or alkalinity. It calculates the amount of hydrogen ions (H+) in a solution. The pH scale has a range of 0 to 14, with 7 being thought of as neutral. Acidity is indicated by a pH value below 7, whereas alkalinity or basicity is indicated by a pH value over 7.

We know that we have that;

pOH = - log(\(2.8 * 10^-4\))

= 3.55

pH = 14 - 3.55

= 10.45

2) pH = -log(H^+)

pH = -log(\(5.2 * 10^-4\))

pH = 3.28

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Answer:

Explanation:

Here, we want to get the mass of carbon (iv) oxide produced

From the question, we have the balanced chemical reaction stating that 2 moles of oxygen molecule produced 1 mole of carbon (iv) oxide molecule

The number of moles of carbon (iv) oxide produced from 7.34 mol oxygen is thus:

1 mole of carbon (iv) oxide contains 44 g

The mass in 3.67 moles will be:

Depending on the sink you're filling, the three-compartment sink's required water temperature varies. For the first and second sinks to comply with FDA regulations, the water must be at least 110 degrees Fahrenheit. The third sanitizing sink's water must be 171 degrees Fahrenheit or hotter if you intend to use it.

The three-compartment sink can be used as a suitable hot water sanitizing method. The object is submerged in water that is at least 170°F in temperature for no less than 30 seconds as the last step of the wash, rinse, and sanitizing procedure.

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Answer:

All matter consists of indivisible particles called atoms. Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements. Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms. Hope that helps : )

hello,

here is your answer:

**********

Postulates of Dalton's atomic theory:

⇒ All matter is made up of very tiny particles called atoms.

⇒ Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.

⇒ Atoms of a given element are identical in mass and chemical properties.

⇒ Atoms of different elements have different masses and chemical properties.

⇒ Atoms combine in the ratio of small whole numbers to form compounds.

⇒ The relative number and kinds of atoms are constant in a given compound.

⇒ Atoms of the same elements can combine in more than one ratio to form more than one compound.

**********

hope this helped,

:)

The term "Lewis base" refers to a molecule or ion that can donate a pair of electrons to form a coordinate bond with a metal or metalloid center. In the given options, CH3NH2 (methylamine) is a Lewis base because it has a lone pair of electrons on the nitrogen atom that can act as a donor. BeCl2 (beryllium chloride) can also act as a Lewis base because it has two empty orbitals that can accept a pair of electrons from a Lewis acid.

Therefore, options C and E are correct, and the answer is either C) CH3NH2, BeCl2 or E) CH3NH2 only, depending on whether BeCl2 is considered a Lewis base or not. Cr3+ and SO3 are not Lewis bases because they do not have any lone pair of electrons to donate.

A Lewis base is a molecule or ion that can donate an electron pair to form a coordinate covalent bond with a Lewis acid. Among the given options, we need to find which ones can act as a Lewis base.

Cr3+ is a cation and does not have an electron pair to donate, so it cannot act as a Lewis base.

SO3 is a molecule with all its oxygen atoms double-bonded to the sulfur atom, so it does not have any lone pair to donate, and thus, cannot act as a Lewis base.

CH3NH2 (methylamine) has a lone pair of electrons on the nitrogen atom, making it a good candidate to donate an electron pair and act as a Lewis base.

BeCl2 is an electron-deficient molecule and would rather accept a lone pair of electrons, acting as a Lewis acid, not a base.

Considering these explanations, the correct answer is:

E. CH3NH2 only

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Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

Nascent hydrogen is more reactive than molecular hydrogen simply because nascent hydrogen is more reactive than molecular hydrogen.

This released energy activates the nascent hydrogen and makes it more energy rich than that of ordinary occurring molecular hydrogen.

An element can be defined as a substance which cannot be split into simpler units by an ordinary chemical process.

Below are examples of some chemical elements

So therefore, nascent hydrogen is more reactive than molecular hydrogen simply because nascent hydrogen is more reactive than molecular hydrogen.

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W = -P_ext ΔV

545 J = -P_ext × (-2.50 L)

545 J = 2.50 P_ext L

P_ext = -218 Pa

IG: whis.sama_ent

Answer:

a

Explanation:

first one i did the test trust me

Answer:

2.24 L

Explanation:

Calculating the final volume

V2 = V1 • (T2 / T1)

V2 = 2.33 L • (293 K / 304 K)

V2 = 2.24 L

The balanced equation for this reaction is:

CH3CH2CH2OH + C6H5N=C=O → CH3CH2CH2OC(=O)N(C6H5)CH3 + H2O

CH3CH2CH2OH + C6H5N=C=O → CH3CH2CH2OC(=O)N(C6H5)CH3 + H2O

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The Clausius-Clapeyron equation, which links a substance's vapour pressure to its temperature. Therefore, the liquid's heat of vaporisation is roughly 45.56 kJ/mol.

The Clausius-Clapeyron equation, which connects the change in vapour pressure to the change in temperature and the heat of vaporisation, can be used to address this issue: Hvap/R(1/T1 - 1/T2) is equal to ln(P2/P1). When the temperature rises from 22.4°C (295.55 K) to 30.7°C, the liquid's vapour pressure increases by a factor of three (303.85 K). P2/P1 = 3 T1 = 295.55 K T2 = 303.85 K is the result.

The Clausius-Clapeyron equation can be solved for by substituting these values and getting the answer: ln(3) = Hvap/R(1/295.55 - 1/303.85).

ΔHvap = -R(1/295.55 - 1/303.85)

ln(3)

Applying the gas constant R = 8.314 J/(mol K), the following equation is obtained: Hvap = -8.314 J/(mol K) (1/295.55 K - 1/303.85 K) ln (3)

Hvap equals -40.71 J/mol.

We divide this amount by 1000 to get kJ/mol:

ΔHvap = -0.0407kJ/mol

As a result, the liquid's heat of vaporisation is 0.0407 kJ/mol.

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Answer:

2

Explanation:

1. Take 2-3 crystals of potassium permanganate and dissolve them in 100 mL of water.

2. Take out approximately 10 mL of this solution and put it into 90 mL of clear water.

3. Take out 10 mL of this solution and put it into another 90 mL of clear water.

4. Keep diluting the solution like this 5 to 8 times.

5. Is the water still coloured?

Main answer:In order to find the mass of catalyst required for a 70% conversion, the following explanation can be followed:Explanation:Given the irreversible gas phase reaction of ethylene (A) with hydrogen (B) to produce ethane (C) is carried out in a Ni-catalyzed packed-bed reactor: A + B =CThe rate constant for this reaction at 400°K is K= 0.2 L2 /mol s Kg catThe feed stream contains an equimolar amount of A and B and enters a temperature of 400°K and a pressure of 5 atm with a total volumetric flow rate of 8 L/sTo find the mass of catalyst required for a 70% conversion, the following equation can be used:Plug the given values in the equation:To convert L/s into mol/s, the following formula can be used:Total volumetric flow rate (Q) = 8 L/sThe molar volume of the reactants can be calculated as follows:Therefore, the number of moles entering the reactor per second:To find the number of moles of A converted to C per second, the conversion can be used as follows:Therefore, the number of moles of A that will react per second:The mass of the catalyst that will be required can be calculated as follows:Therefore, the mass of catalyst required for a 70% conversion is 9.64 Kg.

Approximately 0.36 kg of catalyst is required for a 70% conversion in the given Ni-catalyzed packed-bed reactor, assuming a surface area of 10 m².

Given:

Rate constant (k) = 0.2 L²/mol s Kg cat

Total volumetric flow rate (Q) = 8 L/s

Conversion (X) = 70%

To calculate the mass of catalyst required, we need the surface area of the catalyst. Since the surface area (S) is not provided, let's assume a value of 10 m² for demonstration purposes.

Substituting the values into the equation:

Catalyst mass = (k * 0.3² * Fa₀ * Fb₀) / (Rate constant * Surface area of catalyst)

Catalyst mass = (0.2 L²/mol s Kg cat * (0.3)² * 4 L/s * 4 L/s) / (0.2 L²/mol s Kg cat * 10 m²)

Catalyst mass = (0.2 * 0.09 * 4 * 4) / (0.2 * 10)

Catalyst mass = 0.72 / 2

Catalyst mass = 0.36 kg

Therefore, approximately 0.36 kg of catalyst is required for a 70% conversion in the given Ni-catalyzed packed-bed reactor, assuming a surface area of 10 m².

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In general, a factor that affects the reaction rates is the quantity of collisions between particles will speed up the response, while a factor that reduces the quantity of collisions between particles would slow it down.

Quantity of Reactants

A faster reaction rate is produced by more efficient collisions per unit of time as a result of a higher reactant concentration (except for zero-order reactions)

Temperature

Greater temperatures are indicative of higher average molecular kinetic energies and more collisions per unit of time since temperature is a measure of a system's kinetic energy.

Medium or Matter's State

A chemical reaction's pace is affected by the kind of media it takes place in, such as aqueous or organic, polar or nonpolar, liquid, solid, or gaseous.

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Answer:

(i) To calculate the number of moles of sodium thiosulphate present in the solution, we can use the formula:

moles = concentration x volume

The concentration of the sodium thiosulphate solution is given as 0.100 mol dm^-3 and the volume is 36.0 cm^3.

We can calculate the number of moles of sodium thiosulphate as:

moles = 0.100 mol dm^-3 x (36.0 cm^3 / 1000 cm^3/dm^3) = 0.0036 mol

(ii) We are told that six moles of sodium thiosulphate were needed for each mole of sodium iodate(V). So, we can calculate the number of moles of sodium iodate(V) in the sample as:

moles of sodium iodate(V) = moles of sodium thiosulphate / 6

moles of sodium iodate(V) = 0.0036 mol / 6 = 6.00 x 10^-4 mol

(iii) To calculate the concentration of the sodium iodate(V) solution in mol dm^-3, we can use the formula:

concentration = moles of solute / volume of solution

The number of moles of sodium iodate(V) is 6.00 x 10^-4 mol and the volume of the solution is 50.0 cm^3.

so,

concentration = 6.00 x 10^-4 mol / (50.0 cm^3 / 1000 cm^3/dm^3) = 1.2 x 10^-4 mol dm^-3

(iv) To calculate the concentration of the sodium iodate(V) solution in g dm^-3, we can use the formula:

concentration in g dm^-3 = molar mass x concentration in mol dm^-3

The molar mass of sodium iodate(V) is 198 g/mol.

so,

concentration in g dm^-3 = 198 g/mol x 1.2 x 10^-4 mol dm^-3 = 0.00237 g dm^-3

This is the final concentration of sodium iodate(V) solution in g dm^-3.

Answer: Plate movement is thought to be driven by a combination of the motion of the seafloor away from spreading ridges due to variations in topography and density changes in the crust.

Hope this helps

Answer: they need people to measure because they can’t just say 5 because it can mean 5in 5ft. etc.

Explanation: