Hydrazine, N2H4 , has been used as a rocket fuel because its reaction with oxygen is extremely exothermic:

N2H4(l) + O2(g) -> N2(g) + 2H2O(g) H=-534.0kJ

The enthalpy change for the vaporization of water is given by:

H2O(l) -> H2O(g) H= 40.7kJ

Calculate the enthalpy change that would result if the water were produced in liquid rather than the gaseous form.
N2H4(l) + O2(g) -> N2(g) + 2H2O(l) H=?

If 250 mL of methane (CH4) effuses through a small hole in 48 s, the time required for the same volume of helium to pass through the hole is approximately 96 s.

The effusion rate of a gas is inversely proportional to the square root of its molar mass, according to Graham's law of effusion. In this case, we need to compare the effusion rates of methane and helium.

Since the volume is constant, we can use the ratio of their times of effusion.

Let's assume the molar mass of methane (CH4) is M1 and the molar mass of helium (He) is M2. According to Graham's law, the ratio of the effusion times is given by:

(time for methane) / (time for helium) = √(M2 / M1)

Given that the time for methane is 48 s, we need to find the time for helium. Rearranging the equation, we have:

(time for helium) = (time for methane) / √(M2 / M1)

By substituting the molar masses of methane (16.04 g/mol) and helium (4.00 g/mol), we can calculate:

(time for helium) = 48 s / √(4.00 g/mol / 16.04 g/mol)

(time for helium) = 48 s / √(0.25)

(time for helium) = 48 s / 0.5

(time for helium) = 96 s

Therefore, the time required for the same volume of helium to pass through the hole is approximately 96 seconds.

Learn more about Graham's law of effusion here:

brainly.com/question/30982581

#SPJ11

Physical chemistry a  major branch of chemistry would be most concerned with studying a series of chemical reactions in order to measure the amount of heat being released in each one.

For more information on  chemistry kindly visit to

https://brainly.com/question/13428382

#SPJ1

Answer:

In units of measurement of length we use centimeter (cm) to measure. We can use this unit for measuring the length of a pencil, the width of a book etc. but this unit is too big to measure the thicken of a pencil. So we use another unit called millimeter (mm).

Explanation:

To produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta. To determine the amount of pasta required to produce 1000 kg of fishmeal, we need to consider the mass balance of the process. Let's break down the steps involved:

A. Extraction of fish oil:

The pasta obtained from the extraction stage contains 20% flour and 80% water. To calculate the amount of pasta, we need to determine the mass of flour and water in the pasta. Let's assume the total mass of the pasta is P kg.

Mass of flour = 20% of P = 0.2P kg

Mass of water = 80% of P = 0.8P kg

b. Drying of pasta:

During the drying stage, the pasta is dried in a rotary drum, resulting in fishmeal with 40% humidity. This means that the final fishmeal will contain 60% dry matter.

Let's assume the mass of the dried fishmeal is M kg.

Mass of dry matter = 60% of M = 0.6M kg

Since the dry matter in the fishmeal comes from the flour in the pasta, we can equate the mass of dry matter to the mass of flour:

0.6M kg = 0.2P kg

To produce 1000 kg of fishmeal, we want to find the corresponding value of P:

0.6M = 0.2P

P = (0.6M) / 0.2

P = 3M

Therefore, to produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta.

To know more about mass balance, click here, https://brainly.com/question/17014679

#SPJ11

Explanation:

protons and neutrons.....

...

Answer:

The subatomic particles are Protons and Neutrons.

0.948 mg of chloramine will be found in one cup of drinking water if the concentration is 4.0 ppm.

It is given that concentration of chloramine is 4.0 ppm which equals two 4 mg per litre. It is assumed that one cup of drinking water has a volume of 237 ml.

To calculate the amount of chloramine in one cup of drinking water:

237ml = 0.237L

4.0 ppm = 4g/L of chloramine

Mass of Chloramine in 0.237L = 4 grams/L* 0.237L

Mass of Chloramine = 0.948grams

To learn more about PPM, visit here:

https://brainly.com/question/16727593

#SPJ4

Sea Arches are formed when a cave continues to be eroded and expanded until it cuts through a headland.

A sea cave forms when a sea arch pursues to be eroded and widened until the rock becomes too weak to carry the roof of the sea cave and collapses into the sea. Caves are devised by the dissolution of limestone. Rainwater collects carbon dioxide from the air and as it percolates through the soil, which rotates into a weak acid.

Sea caves occur on almost every precipice headland or coast where the waves break straight on a rock cliff and are formed Sea caves by mechanical erosion rather than the chemical solution procedure that is responsible for the majority of inland caves.

So we can conclude that Sea caves or littoral caves are formed fundamentally from erosion caused by waves

Learn more about Sea caves here: https://brainly.com/question/11986692

#SPJ1

Answer: (P2/P1)=(T2/T1)

(P2/1200.0kPa)=(387/283)

P2=(387K/283K) * (1200kPa)

P2= 1641kPa

Explanation:

An Oxygen Tank has a pressure of 1200 Kpa at 283K and when temp. is increased to 378 K then pressure will be 1,602.82 kpa.

From the ideal gas equation it is clear that pressure of gas is directly proportional to the temperature, and for this question required equation will be:

P₁/T₁ = P₂/T₂, where

P₁ = initial pressure of oxygen tank = 1200 kpa

T₁ = initial temperature of oxygen tank = 283 K

P₂ = final pressure of oxygen tank = ?

T₂ = final temperature of oxygen tank = 378 K

On putting values, we get

P₂ = (1200)(378) / (283) = 1,602.82 kpa

Hence resultant pressure of the oxygen tank is  1,602.82 kpa.

To know more about ideal gas equation, visit the below link:

https://brainly.com/question/555495

#SPJ2

Answer:

Aluminum the highest is spdf

a. Q value of 7-Li(p,n) reaction

The Q value of a nuclear reaction is the energy released during the reaction. It can be calculated using the formula:

Q = (Mi - Mf)c² where Mi is the initial mass, Mf is the final mass, and c is the speed of light.

7Li(p,n) reaction is given as:

7Li + p → n + 4

HeInitial Mass = 7.016003 amu + 1.007825 amu = 8.023828 amu

Final Mass = 1.008665 amu + 4.002603 amu = 5.011268 amu

Q = (Mi - Mf)c²

Q = [(7.016003 + 1.007825) - (1.008665 + 4.002603)] x (931.5 MeV/c²)Q = 4.02 MeV

Therefore, the Q value of 7-Li(p,n) reaction is 4.02 MeV.

b. Threshold energy of 7-Li(p,n) reactionThreshold energy is the minimum energy required for a nuclear reaction to occur. It is given as:

E(threshold) = (Mf - Mi - mn)c²/2Miwhere Mi is the initial mass, Mf is the final mass, mn is the mass of a neutron, and c is the speed of light.The mass difference between the final and initial products is

(Mf - Mi - mn) = (5.011268 - 7.016003 - 1.008665) amu = - 3.0 x 10⁻³ amu

Threshold energy E(threshold) = (- 3.0 x 10⁻³ amu x (931.5 MeV/c²) / (2 x 7.016003 amu)

E(threshold) = 1.20 MeV

Therefore, the threshold energy for 7-Li(p,n) reaction is 1.20 MeV.

The Q value of 7-Li(p,n) reaction is 4.02 MeV. The threshold energy for 7-Li(p,n) reaction is 1.20 MeV.

To know more about neutrons visit:

https://brainly.com/question/31977312

#SPJ11

1. Some reactions will present an actual yield lower than the theoretical yield, and this can occur due to many situations, a couple of the reasons why that we can list is that some reactions don't have the reactants actually reacting to form the products, and another reason why is the loss of reactants in the process for many possible situations.

4. According to the solubility curve, if we have 30 grams of NH4Cl at 50°C, the reaction will be unsaturated

nswer:

For Q1 its B!

Explanation:

cuz I'm smart dw.

During tubular reabsorption, solutes are transferred back to the circulation. Glomerular filtration involves the passive transfer of small substances from the blood towards the filtrate.

The second crucial step in the production of urine is tubular reabsorption. Many of the glomerular filtration of solutes needed for proper bodily operation, like amino acids, glucose, et salts, begins in the proximal section of the tubule.

The reverse of reabsorption, tubular secretion is the movement of substances from peritubular capillaries into the renal tubular lumen. Passive diffusion and active transport are the main causes of this secretion. Usually, only a small number of substances—usually waste products—are excreted.

To know more about Tubular reabsorption visit:

https://brainly.com/question/27109115

#SPJ4

Three ways in which colorless compounds can be located on a TLC (Thin Layer Chromatography) slide are:

1) Iodine Staining: The TLC slide is placed in a container with iodine crystals. The iodine vapor reacts with the colorless compounds and produces a yellowish-brown stain, which helps to locate the compounds.

2) UV Light: The TLC slide is exposed to UV light. Some colorless compounds absorb the UV light and appear as dark spots on the slide.

3) Chemical Staining: The TLC slide is treated with a chemical reagent that reacts with the colorless compounds and produces a colored stain. For example, ninhydrin is used to locate amino acids and proteins on a TLC slide.

In conclusion, colorless compounds can be located on a TLC slide by using iodine staining, UV light, and chemical staining. These methods help to visualize and identify the compounds on the slide.

To know more about TLC click here:

https://brainly.com/question/13086570

#SPJ11

Answer:

18

Explanation:

use the equation 2n^2

Based on the given information, the true statement about the time indicated by the blue arrow is: (c) The rate of the forward reaction (N₂O₄ formation) is equal to the rate of the reverse reaction (NO₂ formation).

The graph shows the relative amounts of NO₂ and N₂O₄ over time, and the point indicated by the blue arrow represents a state of equilibrium. In an equilibrium state, the forward and reverse reactions occur at equal rates.

The concentrations of NO₂ and N₂O₄ reach a constant value, indicating that the conversion of NO₂ to N₂O₄ and the conversion of N₂O₄ to NO₂ are occurring at the same rate.

Option a suggests that NO₂ molecules are no longer reacting, which is incorrect as the reaction is still ongoing at equilibrium. Option b suggests that the reactant has been completely used up, which is not the case in an equilibrium state. Option d refers to the activation energy, which is unrelated to the equilibrium state. Therefore, option c is the correct choice.

To know more about the blue arrow refer here :

https://brainly.com/question/31741705#

#SPJ11

The volume percentage of silicon in the alloy is approximately 38.2%.

To calculate the volume percentage of silicon in the alloy, we need to consider the weight percentage and the densities of silicon and aluminium.

First, we calculate the volume of each component in the alloy based on their weight percentages. Since the density is defined as mass per unit volume, we can use the weight percentage to determine the mass of each component. For example, in 100 grams of the alloy, we have 16 grams of silicon and 84 grams of aluminium.

Next, we calculate the volume of silicon and aluminium by dividing their respective masses by their densities. Using the density of silicon (2.35 gm/cc), we find that the volume of silicon is approximately 6.81 cc. Similarly, using the density of aluminium (2.7 gm/cc), we find that the volume of aluminium is approximately 31.11 cc.

Finally, we calculate the volume percentage of silicon in the alloy by dividing the volume of silicon by the total volume of the alloy (sum of the volumes of silicon and aluminium) and multiplying by 100. In this case, the volume percentage of silicon in the alloy is approximately 38.2%.

Learn more about silicon

brainly.com/question/28213172

#SPJ11

The primary ester example presented is ethyl acetate, which has a fruity descriptor and is commonly found in Riesling wines.

The primary ester example that was presented is ethyl acetate. Ethyl acetate is an ester formed by the condensation of acetic acid and ethanol. It is commonly used as a flavoring compound due to its fruity aroma and taste.

When it comes to wine, ethyl acetate is one of the most common esters found in both red and white wines. It contributes to the fruity and floral aromas often associated with wines. In particular, it is commonly found in Riesling wines, a white wine varietal known for its aromatic profile.

The fruity descriptor refers to the characteristic scent and flavor of ethyl acetate, reminiscent of fruits such as apples, pears, and bananas. This fruity note adds complexity and enhances the overall sensory experience of the wine.

It's important to note that the presence and concentration of ethyl acetate in wines can vary depending on factors such as grape variety, fermentation conditions, and aging process.

However, it is generally recognized as an ester that contributes to the aromatic profile and flavor profile of wines.

To know more about "Concentration" refer here:

https://brainly.com/question/30639206#

#SPJ11

The conclusion about the rates of the rotting reaction from the table would be that the reaction occurs more quickly when the concentration of salt is higher—option B.

The rate of reaction, or reaction rate, is the time it takes for a reaction to occur. In other words, it is the time it takes for the reactants of a reaction to become products.

In this case, the reactant is the rope and the product is the rotten product of the rope. From the table, it took 10 years for the rope to decay in a lake. On the other hand, it took the same rope just 4 years to decay in an ocean.

The difference between the two water bodies is the presence of salt. The lake has almost zero salt while the conentration of salt in the ocean water is high.

Thus, the conclusion about the rate of rotting reaction would be that the reaction is hastened by the presence of salt in the ocean water.

More on the rate of reactions can be found here: https://brainly.com/question/8592296

#SPJ1

Acid rain results when humans put excess amounts of sulfur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere.

These pollutants are released primarily from industrial processes and the burning of fossil fuels, which then react with water, oxygen, and other chemicals to form sulfuric acid and nitric acid. These acids then fall to the ground in the form of precipitation, known as acid rain.

Any type of precipitation that contains acidic elements, such as sulfuric or nitric acid, that falls to the ground from the atmosphere in wet or dry forms is referred to as acid rain, also known as acid deposition. This can apply to rain, snow, fog, hail, and even corrosive dust.

More on Acid rain: https://brainly.com/question/30271624

#SPJ11

The mass of 3.35 mol of Hg(IO3)2 is 1,170 g. Therefore, none of the given options (1,700 g, 1,840 g, 1,960 g, 2,110 g) match the calculated value.

To determine the mass of 3.35 mol of Hg(IO3)2, we need to calculate the molar mass and multiply it by the number of moles.

The molar mass of Hg(IO3)2 can be calculated as follows:

Hg: atomic mass of Hg = 200.59 g/mol

(IO3)2: 2 x (I: atomic mass of I = 126.90 g/mol + 3 x (O: atomic mass of O = 16.00 g/mol) = 2 x (126.90 g/mol + 3 x 16.00 g/mol) = 2 x (126.90 g/mol + 48.00 g/mol) = 2 x 174.90 g/mol = 349.80 g/mol

Now, we can calculate the mass:

Mass = molar mass multiplied with number of moles

Mass = 349.80 g/mol x 3.35 mol = 1170.33 g

Rounded to the nearest gram, the mass of 3.35 mol of Hg(IO3)2 is 1,170 g. Therefore, none of the given options (1,700 g, 1,840 g, 1,960 g, 2,110 g) match the calculated value.

Learn more about moles at: https://brainly.com/question/29367909

#SPJ11

Answer:

no I'm about to say we will be didn't 1,600 we will 500

According to the information in Table 1., Al metal requires the most energy to raise 1.00 g of it by 1.00ºC

The specific heat capacity of a substance represents the amount of energy required to raise the temperature of a given mass of that substance by 1 degree Celsius. In this case, we are comparing the specific heat capacities of aluminum (Al), nickel (Ni), copper (Cu), and lead (Pb) to determine which metal requires the most energy to raise its temperature. Among the given metals, aluminum (Al) has the highest specific heat capacity value of 0.903 J/g·°C. This means that it takes 0.903 Joules of energy to raise the temperature of 1 gram of aluminum by 1 degree Celsius.

On the other hand, nickel (Ni) has a lower specific heat capacity of 0.444 J/g·°C, copper (Cu) has a specific heat capacity of 0.389 J/g·°C, and lead (Pb) has the lowest specific heat capacity of 0.128 J/g·°C. Since aluminum has the highest specific heat capacity value, it requires the most energy to raise the temperature of 1.00 gram of it by 1.00 degree Celsius.

Learn more about specific heat here:

https://brainly.com/question/31608647

#SPJ11

Total number of valence electrons in the Lewis structure of XeO4 is 32.

Valence electrons are electrons that located in the outermost electron shell of an atom. These electrons, being the furthest from the nucleus and thus the least tightly held by the atom, are the electrons that participate in bonds.

Lewis structure - A Lewis Structure is a very simplified representation of the valence shell electrons in a molecule. It is used to show how the electrons are arranged around individual atoms in a molecule.

Lewis structure of XeO4 is made up of one xenon and four oxygen atom, the xenon is in a central position, and all oxygen is at the surrounding position. There are four double bonds(Xe=O) present in the XeO4 lewis structure. The lewis structure of XeO4 contains 8 pairs of nonbonding electrons and 8 pairs of bonding electrons.

learn more about Lewis structure:

https://brainly.com/question/20300458

#SPJ4

Arsenic, hydraulic fracturing, lead, and PFAS present chemical threats to global drinking water supplies in different ways.

Let's discuss each of them in detail:

(a) Arsenic - The origin of arsenic exposure is natural deposits or contamination from agricultural or industrial practices. Human health consequences include skin, lung, liver, and bladder cancers. It can also lead to cardiovascular diseases, skin lesions, and neurodevelopmental effects. Drivers of continued exposure include poor regulation and monitoring. Modern solutions include rainwater harvesting and treatment.

(b) Hydraulic fracturing - Hydraulic fracturing involves using a mixture of chemicals, water, and sand to extract natural gas and oil from shale rock formations. The origin of exposure is contaminated surface and groundwater due to the release of chemicals from fracking fluids and other sources. Human health consequences include skin, eye, and respiratory irritation, headaches, dizziness, and reproductive and developmental problems. Drivers of continued exposure include lack of regulation and poor oversight. Modern solutions include alternative energy sources and regulation of the industry.

(c) Lead - Lead contamination in drinking water can occur due to corrosion of plumbing materials. Human health consequences include neurological damage, developmental delays, anemia, and hypertension. Drivers of continued exposure include aging infrastructure and poor maintenance. Modern solutions include replacing lead service lines, testing for lead levels, and implementing corrosion control.

(d) PFAS - PFAS (per- and polyfluoroalkyl substances) are human-made chemicals used in a variety of consumer and industrial products. They can enter the water supply through wastewater discharges, firefighting foams, and other sources. Human health consequences include developmental effects, immune system damage, cancer, and thyroid hormone disruption. Drivers of continued exposure include the continued use of PFAS in consumer and industrial products. Modern solutions include reducing the use of PFAS in products and treatment methods such as granular activated carbon.

To know more about hydraulic fracturing visit:

https://brainly.com/question/31032804

#SPJ11

The earth is composed of mineral elements either alone or in the combinations called the compounds. A mineral is composed of a single element or compound. Among the given statements, the correct statements are 1, 2 and 3 only. The correct option is B.

The naturally occurring inorganic solid with a definite chemical composition and a crystalline structure is defined as the mineral. The different minerals found under the surface of earth are characterized by the shape, hardness, luster, size, etc.

Each mineral has a unique lustre like silky, glossy, etc. some minerals have a characteristic colour, streak is the shade of a mineral when it is crushed into a fine powder. Hardness depends on the strength of bonds in minerals.

Thus the correct option is B.

To know more about minerals, visit;

https://brainly.com/question/15844293

#SPJ1

An emulsion is a mixture of two liquids that are not normally soluble in each other, such as oil and water. The liquids are held together by an emulsifying agent, such as lecithin, which acts as a stabilizer.

Using brine can help with an emulsion because the salt in the brine can help to break down the proteins in the emulsifying agent, causing it to bind more strongly with the liquids and improving the stability of the mixture. Additionally, the high salt content in brine can also help to inhibit the growth of bacteria, which can be beneficial when working with perishable ingredients in an emulsion.

To know more about Emulsion click this link-

brainly.com/question/31621101

#SPJ11

Answer:

506.81J

Explanation:

H = MC(T1 - T0)

H = 5 × 0.897 × (419 - 306)

H = 5 × 0.897 × 113

H = 506.81 J

As per specific heat of aluminium ,506.81 J of energy is gained  by the sample.

Specific heat capacity is defined as the amount of energy required to raise the temperature  of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.

It varies with temperature  and is different for each state of  matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.

It is given by the formula ,

Q=mcΔT

For the given example, Q=energy

m=mass=5 g, C=0.897 J/g.K

T₂=419 K

T₁=306 K

substituting in the formula ,Q=5×0.897(419-306)=506.81 J.

Thus, 506.81 J of energy is required.

Learn more about specific heat capacity,here:

https://brainly.com/question/1747943

#SPJ2