Why is the air in a jet aircraft flying at high altitudes pressurized? *

Answer : The partial pressure of the hydrogen is, 705.9 mmHg

Explanation :

According to the Dalton's law of partial pressure,

[tex]P_T=P_{H_2}+P_{H_2O}[/tex]

where,

[tex]P_T[/tex] = total pressure of the gas = 729.7 mmHg

[tex]P_{H_2}[/tex] = partial pressure of the hydrogen gas = ?

[tex]P_{H_2O}[/tex] = partial pressure of the water = 23.8 mmHg (standard value)

Now put all the given values in the above expression, we get:

[tex]729.7mmHg=P_{H_2}+23.8mmHg[/tex]

[tex]P_{H_2}=705.9mmHg[/tex]

Therefore, the partial pressure of the hydrogen is, 705.9 mmHg

Answer:

c

Explanation:

all of the friction from the fan blades and the fan inside has stopped the fan from spinning and friction is heat.

If the electricity is cut off, the fan blades will slow down and further eventually stop spinning in case of all the kinetic energy of the fan blades has been turned into heat energy. The correct option is C.

In physics, an object's kinetic energy is the energy it has basically as a consequence of its motion.

It is described to as the amount of work required to accelerate a body of a given mass from initial state to a given velocity.

The body usually regains its kinetic energy after gaining it during acceleration unless its speed changes.

Kinetic energy is the energy that an object has as a consequence of its movement. The ability of kinetic energy to do work is perhaps its most crucial mandatory property.

Work is renowned as force acting in the direction of motion on an object. Work as well as energy are so inextricably interlinked that they can be utilized even interchangeably.

Thus, the correct option is A.

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Answer:

1.Ca atom has greater radius than Ca+2

2.F- ion has larger radius than F

1. The Ca+2 ion has a smaller radius than the Ca atom. 2. The F- ion has a larger radius than the F atom. 3. The trend for ionic radius vs. atomic radius is that ions are generally smaller than their corresponding atoms.

1. The Ca+2 ion has a smaller radius than the Ca atom. When an atom loses electrons to become a cation, it loses its outermost electrons, resulting in a decrease in the size of its electron cloud and thus a smaller radius.

2. The F- ion has a larger radius than the F atom. When an atom gains electrons to become an anion, it adds electrons to its outermost energy level, resulting in an increase in the size of its electron cloud and thus a larger radius.

3. The trend for ionic radius vs. atomic radius is that ions are generally smaller than their corresponding atoms. Cations are smaller than their parent atoms because they have lost electrons, which reduces the electron cloud and decreases the size. Anions are larger than their parent atoms because they have gained electrons, which increases the electron cloud and increases the size.

Answer:

793 kJ

Explanation:

Given that :

[tex]T_1 = 1760^0C\\\\T_2 = 2060^0C\\\\ c_s = 44.8 \ J/g \ ^0C[/tex]

Then; the heat needed to convert solid from [tex]1760^0C \ to \ 1860^0C[/tex] is calculated as:

[tex]Q_1 = mc_s \delta T[/tex]

[tex]Q_1 = mc_s (T_f - T_i)[/tex]

[tex]Q_1 = 159.6*44.8(1860-1760)^0C \\ \\ Q_1 = 715008 \ J[/tex]

Also;

[tex]\delta H_f = 20.5 \ kJ/mol = 20500 \ J/mol \\ \\ Molar \ mass \ of \ Cr = 52.0 g/mol \\ \\ number \ of \ moles\ of \ Cr = \frac{mass \ of \ Cr}{molar \ mass} \\ \\ = \frac{159.6}{52.0}\\\\= 3.069 \ mol[/tex]

Now; the heat required to convert solid to liquid at [tex]1860^0C[/tex] is;

[tex]Q_2 = n* \delta H_f[/tex]

= 3.069 × 20500

= 62914.5 J

Also ; given that :

[tex]c__l}} = 0.94 \ J/g \ ^0C \\ \\[/tex]

Then the heat needed to convert liquid from [tex]1860^0C[/tex]to [tex]2060^0C[/tex] is;

[tex]Q_3 = m*c__l} (T_f-T_l)[/tex]

[tex]Q_3 = 159.6*0.94*(2060-1760)[/tex]

[tex]Q_3 = 15002.4 \ J[/tex]

∴ The total heat required = [tex]Q_1 + Q_2 + Q_3[/tex]

= (715008 + 62914.5 + 15002.4) J

= 792924.9 J

= 793 kJ

Teking into accoun the definition of calorimetry, sensible heat and latent heat, the amount of heat required is 808 kJ.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

In firts place, you know that the melting point is 1860°C. So, first of all you must increase the temperature from 1760 ° C (in solid state) to 1860 ° C, in order to supply heat without changing state (sensible heat).

The amount of heat a body receives or transmits is determined by:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing:

Q1= 44.8 [tex]\frac{J}{gC}[/tex]× 159.6 g× 100 °C

Solving:

Q1=715,008 J= 715.008 kJ

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

In this case, you know:

Replacing:

Q2= 3.069 moles×20.5 [tex]\frac{kJ}{mol}[/tex]

Solving:

Q2=62.9145 J

Similar to sensible heat previously calculated, you know:

Replacing:

Q3= 0.94 [tex]\frac{J}{gC}[/tex]× 159.6 g× 200 °C

Solving:

Q3=30,004.8 J= 30.0048 kJ

The total heat required is calculated as:  

Total heat required= 715.008 kJ + 62.9145 kJ + 30.0048 kJ

Total heat required= 807.9273 kJ ≅ 808 kJ

In summary, the amount of heat required is 808 kJ.

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Answer:

CACO3 is a precipitate. answer C definitely.

The chemical reaction that will produce a precipitate is:

C. [tex]Na_2CO_3+CaCl_2----- > CaCO_3+2NaCl[/tex]

Formation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion (a negatively charged ion). The solid that separates is called a precipitate.

Thus, out of the given options the option c will form a precipitate when sodium carbonate reacts with calcium chloride, calcium carbonate will form with a salt sodium chloride.

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Answer:

irreversible, exergonic, pyrophosphate

Explanation:

Reactions leading to nucleic acid and protein synthesis are inherently different from those of intermediary metabolism. Such reactions must be essentially irreversible. The synthesis of polynucleotides is thus coupled to exergonic pyrophosphate hydrolysis.

Answer: 2.07 x 1020 tons

Explanation:

Answer:

6.022X10^23

Explanation:

ehh i had this and this is what i answered your welcome?

Answer:

Substances with high boiling points condense at the bottom and substances with lower boiling points condense on the way to the top. The crude oil is evaporated and its vapours condense at different temperatures in the fractionating column.

Explanation:

answer above

Answer:Eat a light dinner and avoid foods that trigger your heartburn. Don't lie down for at least 2 to 3 hours after you eat. Use blocks or books to raise the head of your bed by 4-6 inches. Or put a foam wedge under your mattress at the head of the bed.

Explanation:

The correct option is D.

They are equations that make use of chemical formulae and symbols to represent chemical reactions. The left-hand side of a chemical equation represents the reactants and the right-hand side represents the products. These entities are separated by a symbol that describes the direction of the reaction. Each reacting entity is also assigned its corresponding stoichiometric coefficient.

There are five basic categories given below.

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Answer:

an initial velocity that is faster than the final velocity

Explanation:

please like and Mark as brainliest

Answer:

C

Explanation:

Answer:

deoxyribonucleotides are so named because the lack a hydroxyl at the carbon position 2

Answer:

966.12 mmHg

Explanation:

-We apply Gay-Lussac's Law which holds that the pressure of a given gas is directly proportional to it's temperature(in Kelvins) for a constant volume:

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

Given that:

[tex]0\textdegree C=273.15K\\\\T_1=1.0\textdegree C=274.15K\\P_1=750.0\ mmHg\\\\T_2=80\textdegree C=353.15K\\\\P_2=?[/tex]

#We therefore substitute in the formula above to solve for the final pressure, P2:

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}\\\\P_2=T_2\times\frac{P_1}{T_1}\\\\=353.15K\times\frac{750\ mmHg}{274.15K}\\\\=966.12\ mmHg[/tex]

Hence,  is the new pressure inside the containe is 966.12 mmHg

Applying the concept of Gay-Lussac's law from physics, the pressure inside the plastic container of food, when heated from 1.0°C to 80°C, would increase to 966.67 mmHg.

To answer this question, we need to use the concept of Gay-Lussac's Law from physics, which states that the pressure of a gas is directly proportional to its temperature, keeping volume constant. This means when you heat a gas, its pressure will increase.

However, it's important to note that the temperatures must be in Kelvin, not degrees Celsius. So, firstly we convert our temperatures from Celsius to Kelvin. 1°C = 274.15K and 80°C = 353.15K.

Using the formula P1/T1 = P2/T2 (P stands for pressure and T for temperature, the 1's indicating initial conditions and the 2's final), we plug in the values:

750mmHg/274.15K = P2/353.15K. Solving the equation we find P2 = 966.67 mmHg.

So, by heating the plastic container of food from 1.0°C to 80.0°C, the pressure inside the container would increase to 966.67 mmHg.

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Answer:

negative, positive, increase

Explanation:

From the given question,  

During the formation of bond, between two atoms with difference between their electronegativity-

And,

Atoms with different electronegativities share electrons unequally, leading to partial charges. The more electronegative atom gains a partial negative charge, while the other has a partial positive charge. Larger electronegativity differences intensify these charges.

When two atoms with different electronegativities form a covalent bond, the atom with higher electronegativity will attract shared electrons more and will have a partial negative charge. Conversely, the atom with lower electronegativity will have an equal and opposite partial positive charge. As the difference in electronegativity increases, the resulting magnitudes of the partial charges will also increase.

Answer:

A noncompetitive inhibitor can only bind to an enzyme with or without a substrate at several places at a particular point in time

Explanation:

this is because It changes the conformation of an enzyme as well as its active site, which makes the substrate unable to bind to the enzyme effectively so that the efficiency of the enzyme decreases. A noncompetitive inhibitor binds to the enzyme away from the active site, altering/distorting the shape of the enzyme so that even if the substrate can bind, the active site functions less effectively and most of the time also the inhibitor is reversible

Answer:

The percent yield of this reaction is 92.7 %

Explanation:

Step 1: Data given

Mass of nitrogen gas (N2) = 34.0 grams

Mass of ammonia (NH3 produced = 41.0 grams

Molar mass of N2 = 28.0 g/mol

Molar mass of NH3 = 17.02 g/mol

Actual yield of ammonia = 38 grams

Step 2: The balanced equation

N2(g) + 3H2(g) → 2NH3(g)

Step 3: Calculate moles

Moles = mass / molar mass

Moles N2 = 34.0 grams / 28.0 g/mol

Moles N2 = 1.214 moles

Step 4: Calculate moles NH3

For 1 mol N2 we need 3 moles H2 to produce 2 moles NH3

For 1.214 moles N2 we'll have 2* 1.214 = 2.428 moles NH3

Step 5: Calculate mass NH3

Mass NH3 = moles * molar mass

Mass NH3 = 2.428 moles * 17.02 g/mol

Mass NH3 = 41 grams

Step 6: Calculate percent yield for the reaction

Percent yield = (actuald yield / theoretical yield) * 100 %

Percent yield = (38 grams / 41 grams ) * 100 %

Percent yield = 92.7 %

The percent yield of this reaction is 92.7 %

Answer:

[tex]Y=92\%[/tex]

Explanation:

Hello,

In this case, by considering the given chemical reaction, with given mass of nitrogen, one could compute the theoretical yield of ammonia as shown below and considering their 1 to 2 molar relationship in the chemical reaction:

[tex]m_{NH_3}^{theoretical}=34gN_2*\frac{1molN_2}{28gN_2}*\frac{2molNH_3}{1molN_2}*\frac{17gNH_3}{1molNH_3} \\m_{NH_3}^{theoretical}=41.3gNH_3[/tex]

In such a way, the percent yield is obtained as shown below:

[tex]Y=\frac{m_{NH_3}^{actual}}{m_{NH_3}^{theoretical}} *100\%=\frac{38g}{41.3g} *100\%\\\\Y=92.0\%[/tex]

Best regards.

Answer:

Thermodynamics is the branch of physics that deals with the relationships between heat and other forms of energy.

Answer:

Option B

Explanation:

We have the tree solutions here:

A: weak monoprotic acid HA

B: Strong monoprotic acid HA'

C: weak diprotic acid H₂A

In order to explain this, let's discart the options one by one.

C and D cannot be the correct choice. This is because the pH is an expression that is determined by the following expression:

pH = -log[H₃O⁺]

In order to be the same value for all the solutions, the concentration of hydronium should be the same for all. This will be correct if all solutions were monoprotic and strong. However this is not the case.

Solution A and C are weak acids, so this means that they have dissociation constant Ka (In the case of C, it has two Ka values because it's diprotic). So, when these solutions reach the equivalence point or half the equivalence point, the concentration of the acid do not dissociate completely in solution, instead it do this:

HA + H₂O -------> A⁻ + H₃O⁺   Ka

0.1                        0        0

0.1-x                     x         x

[H₃O⁺] = x

Same thing happen with C, but we can see that the concentration is not the same as the innitial concentration.

Solution B is a strong acid, so it will dissociate completely in solution, so concentration of hydronium will be the same of the initial acid, and therefore the pH cannot be the same in the three solutions.

Option A cannot be either because, we have a diprotic solution, this means this acid requires two equivalence points to reach it's final, so, it takes more time and volume to reach the end point. Therefore, it's not the correct option.

Option B is the correct one, because regardless that we have a weak or a strong acid, or if it's diprotic or triprotic, the three of them have the same concentration of acid, and to reach the first equivalence point (the only point for A and B) will be the same for solution C. Therefore, this is the only thing the three solutions have in common.

Answer:

it is called pollutant

Explanation:

this means a subtance that pollutes something especially the environment.

Answer:

4.2 L

Explanation:

Use Boyle's Law and rearrange formula.

- Hope this helps! Please let me know if you need further explanation.

To find the volume of the neon gas at 1.2 atm, we can use the combined gas law equation.

To solve this problem, we can use the combined gas law equation:

P1V1 / T1 = P2V2 / T2

First, we need to convert the given volume in liters to moles using the ideal gas law equation:

V1 = nRT1 / P1

Then, we can rearrange the combined gas law equation to solve for V2:

V2 = (P2 * V1 * T2) / (P1 * T1)

Substituting the given values, we get:

V2 = (1.2 atm * 2.8 L * 273 K) / (1.8 atm * 273 K) = 1.233 L

Therefore, the volume of the neon gas at 1.2 atm would be 1.233 liters.

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Answer:

entropy increases when a glass of water is set in the sun until the water evaporates.

Hope it will help you :)

Explanation:

In the water cycle, evaporation occurs when sunlight warms the surface of the water. The heat from the sun makes the water molecules move faster and faster, until they move so fast they escape as a gas. ... When it is cool enough, the water vapor condenses and returns to liquid water.

Answer: C. Acts as energy reserve in muscle tissue.

Explanation:

Creatine Phosphate is a high energy compound that can be found in muscle tissue.

It serves as an extra energy storage, since the normal metabolism cannot supply the high energy requirement of a muscle at work.

Creatine Phosphate is quickly transfered to ADP, for the production of ATP needed for muscle contraction.

Answer:

8.77g

Explanation:

Step 1:

Data obtained from the question.

This includes the following:

Concentration of A (C1) =.?

Volume of A (V1) = 16 mL

Volume of B (V2) = 300 mL

Concentration of B (C2) = 0.50 M

Molar Mass of NaCl = 58.443 g/mol

Mass of NaCl =.?

Step 2:

Determination of the concentration of A.

Applying the dilution formula:

C1V1 = C2V2

The concentration of A i.e C1 can be obtained as follow:

C1V1 = C2V2

C1 x 16 = 0.5 x 300

Divide both side by 16

C1 = (0.5 x 300) / 16

C1 = 9.375 M

Therefore, the concentration of A is 9.375 M

Step 3:

Determination of the number of mole of NaCl in 9.375 M NaCl solution. This is illustrated below:

Molarity = 9.375 M

Volume = 16 mL = 16/1000 = 0.016 L

Mole of NaCl =?

Molarity = mole /Volume

Mole =Molarity x Volume

Mole of NaCl = 9.375 x 0.016

Mole of NaCl = 0.15 mole

Step 4:

Determination of the mass of NaCl. This is illustrated below:

Mole of NaCl = 0.15 mole

Molar Mass of NaCl = 58.443 g/mol

Mass of NaCl =?

Mass = number of mole x molar Mass

Mass of NaCl = 0.15 x 58.443

Mass of NaCl = 8.77g

Therefore, 8.77g of NaCl is needed to make 1 L of the original solution A.

Answer:

We need 8.77 grams of NaCl

Explanation:

Step 1: Data given

Volume of solution A = 16 mL = 0.016 L

Volume of solution B = 300 mL = 0.300 L

Concentration of solution B = 0.50 M

Step 2: Calculate molarity of solution A

C1*V1 = C2*V2

⇒with C1 = the concentration of solution A = TO BE DETERMINED

⇒with V1 = the volume of solution A = 0.016 L

⇒with C2 = the concentration of solution B = 0.50 M

⇒with V2 = the volume of solution B = 0.300 L

C1 * 0.016 L = 0.50 M * 0.300 L

C1 = 9.375 M

Step 3: Calculate moles of solution A

Moles = molarity * volume

Moles = 9.375 M * 0.016 L

Moles = 0.15 moles

Step 4: Calculate mass of NaCl needed

Mass NaCl = moles / molar mass

Mass NaCl = 0.15 moles * 58.443 g/mol

Mass NaCl = 8.77 grams

We need 8.77 grams of NaCl

Answer: The balloons volume would increase.

Explanation: This is because when the balloon enters a warmer climate it expands due to more freedom within the molecules movement.

Answer:

Explanation:

the next one would be 2.1 L

Answer: The concentration of the chemist's working solution is 0.00268 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

According to the neutralization law,

[tex]M_1V_1=M_2V_2[/tex]

where,

[tex]M_1[/tex] = molarity of stock solution = 10.7 mmol/L =  0.0107 mol/L  [tex]1mmol=10^{-3}mol[/tex]

[tex]V_1[/tex]  = volume of stock solution = 90.0 ml

[tex]M_2[/tex] = molarity of working  solution = ?

[tex]V_2[/tex] = volume of working solution = 360 ml

[tex]0.0107\times 90.0=M_2\times 360[/tex]

[tex]M_2=0.00268M[/tex]

Thus the concentration of the chemist's working solution is 0.00268 M

Answer : The pre-exponential factor in the Arrhenius equation is, 14.99  s⁻¹

Explanation :

Using Arrhenius equation,

[tex]K=A\times e^{\frac{-Ea}{RT}}[/tex]

Taking ln on both the sides, we get:

[tex]\ln K=\frac{-Ea}{RT}+\ln A[/tex]

where,

K = rate constant = [tex]15.0s^{-1}[/tex]

Ea = activation energy = 1.104 J/mol

T = temperature = 300 K

R = gas constant = 8.314 J/mole.K

A = Arrhenius constant

Now put all the given values in the above formula, we get the value of \ln a.

[tex]\ln (15.0s^{-1})=\frac{1.104J/mol}{(8.314J/mole.K)\times (300K)}+\ln A[/tex]

[tex]\ln A=2.708s^{-1}[/tex]

[tex]A=14.99s^{-1}[/tex]

Therefore, the pre-exponential factor in the Arrhenius equation is, 14.99  s⁻¹

The word equation can be represented as the constituents of the equation are written in their full name rather than a symbol.

The word equations for the following descriptions are:

Water = Hydrogen + Oxygen

Magnesium + Oxygen = Magnesium Oxide

Methane + Oxygen = Carbon dioxide + water

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To complete the given word equations:

A. Water -> hydrogen + oxygen;

B. Magnesium + oxygen -> magnesium oxide;

C. Methane + oxygen -> carbon dioxide + water.

To complete the word equations for the described reactions, we need to identify the reactants and products in each case:

A. Electrolysis: The word equation that represents the breakdown of water into hydrogen and oxygen gas is:

B. Magnesium Oxidation: The word equation describing the reaction of magnesium with oxygen to form magnesium oxide is:

C. Methane Combustion: The word equation for the burning of methane in oxygen to produce water and carbon dioxide is:

Write the word(s) to complete the word equation that matches the description of the reaction.

A. Electrolysis breaks down water to form hydrogen and oxygen gas. The word equation that represents this reaction is:

water -->

B. A bright light is produced when magnesium reacts with the oxygen in air to form magnesium oxide. The word equation that represents this reaction is:

magnesium + oxygen -->

C. When methane burns, it reacts with oxygen to produce water and carbon dioxide. The word equation that represents this reaction is:

methane + oxygen -->

Answer:

The specific heat capacity of a substance is the heat capacity of a sample of the substance divided by the mass of the sample. Informally, it is the amount of energy that must be added, in the form of heat, to one unit of mass of the substance in order to cause an increase of one unit in its temperature.

Explanation:

More explanation...

The ratio of the heat energy absorbed by a substance to its increase in temperature. Heat capacity is also called thermal capacity. The specific heat or specific heat capacity of a substance is the heat capacity per unit mass, usually measured in joules per kilogram per degree Kelvin.

- Without the statements, I will not be able to give an exact answer. Hope this helps!

Answer:

D) the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure

Explanation:

on edg

Answer:

It will have expanded

Explanation:

Answer:

It will have expanded

Explanation: