after a period of s, the concentration of no falls from an initial value of 2.8 × 10^–3 mol/l to 2.0 × 10^–3 mol/l. what is the rate constant, k?

Answer:

12113

Explanation:

step by step:no

The pressure of hydrogen gas formed  is 720.8 mmHg.

The pressure exerted by a (specified) component in a mixture of gases.

We have to understand one thing that the Hydrogen, which is collected over water, will be mixed with water vapor.

This means that the total pressure of the mixture will have two components.

The vapor pressure of water at that temperature is approximately

19.231 mmHg.

This means that

\(\rm P_{total} = P_{hydrogen} + \; P_{water vapor}\)

740 = \(\rm P_{hydrogen}\) + 19.231

\(\rm P_{hydrogen}\) = 740-19.231

\(\rm P_{hydrogen}\) = 720.8 mmHg

Therefore the pressure of hydrogen gas formed  is 720.8 mmHg.

To know more about Partial Pressure

https://brainly.com/question/14281129

#SPJ1

Centrifugation is a techinique used to seperate the particles from the solution.

The primary factors influencing centrifugation are particle size and density. When subjected to centrifugation, larger particles go through it more swiftly than smaller ones. The particle's velocity is determined by the Strokes law, which describes how a body travels when subjected to gravity. Following are a few prominent instances of centrifugation: the method of removing fat from milk to obtain skimmed milk. to use a salad spinner to spin out the water from soggy lettuce. water is spin dry in washing machines to reduce the moisture content off clothes.

v=d2(p-D)*g/(18 N)

where

v= velocity

d=diameter of the particle

p= particle density

D= density of the medium

g= Gravitational force(mostly 9.8m/s2)

n= viscosity of the medium

Learn more about centrifugation here:

https://brainly.com/question/28287479

#SPJ4

Answer:

A

Explanation:

In the scientific name limus polyphemus which the species is the classification group for polyphemus

In order to neutralise 15.0 mL of 1.00 M KOH, we therefore require 15.0 mL of 0.50 M Sulfuric acid.

Strong acid and strong base reactions produce a salt that is neither acidic nor basic in nature, or neutral. For instance, sodium chloride and water are produced when HCl (hydrochloric acid), a powerful acid, combines with NaOH, a powerful base.

First, let's calculate the number of moles of potassium hydroxide in 15.0 mL of 1.00 M solution:

moles of Potassium hydroxide = concentration × volume

moles of Potassium hydroxide = 1.00 M × 15.0 mL / 1000 mL per L = 0.015 mol

moles of Sulfuric acid = moles of KOH / 2 = 0.015 mol / 2 = 0.0075 mol

moles of Sulfuric acid = concentration × volume

0.0075 mol = 0.50 M × volume

volume = 0.0075 mol / 0.50 M = 0.015 L

volume in mL = 0.015 L × 1000 mL per L = 15.0 mL

To know more about neutralise visit:-

https://brainly.com/question/23008798

#SPJ1

ratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratioratio

The enzyme β-ketothiolase cleaves off the acetyl-CoA molecule from the 3-ketoacyl-CoA, releasing acetyl-CoA and the remaining fatty acid chain forms acyl-CoA, which is two carbons shorter than the original fatty acid chain.

The complete reaction scheme for the catabolism of Oleoyl-CoA is given below:Oleoyl-CoA is broken down into acetyl-CoA, releasing 150 ATP molecules by the process of Beta-oxidation. The complete reaction scheme for the catabolism of Oleoyl-CoA is given below:

Step 1: Oleoyl-CoA is transported to the mitochondria matrix from the cytoplasm with the help of the carnitine shuttle system.

Step 2: The enzyme Acyl-CoA dehydrogenase catalyzes the removal of two hydrogen atoms from the alpha and beta carbons in the fatty acid chain and oxidizes it. This process forms a double bond between the alpha and beta carbon atoms, leading to the formation of trans-Δ2-enoyl-CoA.

Step 3: The enzyme enoyl-CoA hydratase adds a water molecule to the trans-Δ2-enoyl-CoA, converting it into L-3-hydroxyacyl-CoA.

Step 4: The enzyme L-3-hydroxyacyl-CoA dehydrogenase oxidizes L-3-hydroxyacyl-CoA, releasing a hydrogen ion (H+) and two electrons (2e-) and converts it into 3-ketoacyl-CoA.

Step 5: The enzyme β-ketothiolase cleaves off the acetyl-CoA molecule from the 3-ketoacyl-CoA, releasing acetyl-CoA and the remaining fatty acid chain forms acyl-CoA, which is two carbons shorter than the original fatty acid chain.

The cycle starts again, and this process is repeated until the fatty acid chain is completely degraded.

Learn more about fatty acid with the given link,

https://brainly.com/question/17352723

#SPJ11

Answer:

The cork cell

Explanation:

By the  factor of 2 the rate change if the concentration of hno2 is doubled.

The rate law describes the relationship between the rate of a chemical reaction and the concentrations of its reactants. When the concentration of one of the reactants is altered, the rate of the reaction also changes correspondingly. The relationship between the rate of the reaction and the concentration of reactants is given by the rate law equation.

A factor is calculated using the following formula:

Factor = New concentration / Original concentration

As per the question, if the concentration of HNO2 is doubled, the factor is calculated as follows:

Factor = New concentration / Original concentration = 2x / x = 2

The factor is 2. It means that if the concentration of HNO2 is doubled, the rate of the reaction will increase by two times.

This is because the rate of the reaction is directly proportional to the concentration of HNO2.

For example, if the original rate is 100 units and the concentration of HNO2 is doubled, the new rate will be 200 units (100 x 2).

In conclusion, the factor by which the rate changes if the concentration of HNO2 is doubled is 2. This implies that the rate of the reaction will double if the concentration of HNO2 is doubled. This is due to the direct proportionality of the rate of the reaction with the concentration of HNO2.

Learn more about chemical reaction -

brainly.com/question/25769000

#SPJ11

Answer:

5444.89 grams of Fe

Explanation:

1) We need the chemical equation for Fe3O4 to find the mole ratio for Fe to Fe3O4. Chemical equation:

3Fe+4H2O → Fe3O4+4H2

The mole ratio of Fe to Fe3O4 is 3:1

2) Now, we find how many grams of Fe are needed to produce 32.5 moles of Fe3O4.

\(32.5 moles Fe3O4\)\(x \frac{4 mole O}{1 mole Fe3O4}\) = 97.5 moles Fe needed to produce 32.5 moles of Fe3O4

3) Convert 97.5 moles of Fe into grams. The molar mass of Fe is 55.845g.

\(97.5 mole Fe\)\(x\frac{55.845g Fe}{1 mole Fe}\) = 5444.8875g or 5444.89g.

A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.

Density is an intrinsic property of matter, equal to the quotient between the mass and the volume.

A student has a block with a volume (V) of 150 cm³ and a density (ρ) of 30 g/cm³. We can calculate its mass (m) using the definition of density.

ρ = m/V

m = ρ × V = 30 g/cm³ × 150 cm³ = 4,500 g

A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.

Learn more about density here: https://brainly.com/question/6838128

#SPJ1

The SL-3 components of the M240B medium machine gun are used for barrel replacement and maintenance.

The SL-3 components of the M240B consist of a spare barrel and a barrel bag. The spare barrel is an essential component for sustained firing and allows for the replacement of a hot or worn-out barrel during extended periods of continuous use. When the barrel becomes overheated, it can negatively impact the weapon's accuracy and potentially cause malfunctions. The spare barrel is designed to be quickly swapped with the hot barrel to ensure optimal performance and prevent damage to the weapon.

The barrel bag is used to safely store the hot or dirty barrel after it has been replaced. It serves as a protective cover to prevent accidental contact and potential burns while the barrel is still hot. Additionally, the bag helps contain any carbon or residue that may be present on the barrel, preventing it from spreading and contaminating other equipment or personnel. The barrel bag is an essential part of the maintenance process, ensuring safe handling and transportation of the replaced barrel until it can be properly cleaned and inspected.

Learn more about safe handling of chemicals here: brainly.com/question/1788721

#SPJ11

Answer:

Volume = 35.2×220×6.0 = 46464 centimeters³

Explanation:

Answer:

Freshly prepared ferrous sulphate is used in brown ring test, because if FeSO4 is stored or it is the old one then it reacts with atmospheric oxygen and gets oxidized to form a corrosive brown-yellow coating of basic ferric sulphate, which is an adduct of ferric oxide and ferric sulphate

HEYA FRIEND

.

.

HERE'S YOUR ANSWER

.

.

.

.

It is used in brown ring test because , if Fe2So4 is stored or it is old one then it reacts with atmospheric oxygen and gets oxidized to form a corrosive brown yellow coating of basic ferric sulphate , which is an adduct of ferric oxide and ferric sulphate.

.

✌✌✌

HOPE IT WILL HELP YOU UP

.

.

KATË

Answer:

Refer to the pictures.

Answer:

Hydroelectric power is a renewable energy source which harnesses the power of moving water to produce electricity. As the water flows down through the dam, its kinetic energy is used to turn a turbine. The generator converts the turbine's mechanical energy into electricity.

Explanation:

Hydroelectric power is a renewable energy source which harnesses the power of moving water to produce electricity.

The air - even the cool air - makes the blades rotate, creating kinetic energy.

The blades rotating in this way also form a shaft in the nacelle curve and the generator in the nacelle converts kinetic energy into electrical energy.

As the water flows down through the dam, its kinetic energy is used to turn a turbine. The generator converts the turbine's mechanical energy into electricity.

Wind turbines use blades to collect the kinetic energy of the wind. The air flowing over the blades creates a height (similar to the impact of the wings of a plane), causing the blades to rotate.

The blades are connected to the drive shaft which converts the electric generator, generating (producing) electricity.

Learn more about electrical energy here:

brainly.com/question/582060

#SPJ2

Answer:

Gas

Explanation:

Because Crude oil can usually be found in the ground as a liquid and in the air is gas can be kerosene.

im not so sure but I think the answer is 8. Sorry if im wrong‍

Answer:circular heliocentric orbits.

Explanation:

My hypothesis regarding the change in urine volume was that subjects who drank water would have a higher urine volume compared to those who drank a sports drink. This is because water is a pure hydrating agent that does not contain any added sugars or electrolytes, unlike sports drinks.

Electrolytes in sports drinks cause the body to retain more water and decrease urine output, while added sugars increase urine output. Therefore, the physiologic basis for my prediction is that drinking water would lead to more frequent urination and higher urine volume due to the absence of any added electrolytes and sugars.

In terms of the results, they supported my prediction as the subjects who drank water had a significantly higher urine volume compared to those who drank a sports drink. However, there were a few subjects who had unexpected results where they had a higher urine volume after drinking a sports drink. This could be due to individual variations in their physiology, hydration status, or even their fluid intake before the study. Therefore, it is important to take into account individual variations when interpreting the results.

Learn more about urine volume at brainly.com/question/27454851

#SPJ11

Answer:

urine

Explanation:

urine tastes good :oP

Answer:

one star

In our solar system, there is only one star that we know of – the sun! Our solar system is very unique in that is only has one star. Most other solar systems have at least two stars. These are called binary systems.

Explanation:

\(\huge\purple{Hi!}\)

Some estimates peg the Milky Way's star mass as having 100 billion "solar masses," or 100 billion times the mass of the sun. Averaging out the types of stars within our galaxy, this would produce an answer of about 100 billion stars in the galaxy. This is subject to change, however, depending on how many stars are bigger and smaller than our own sun. Also, other estimates say the Milky Way could have 200 billion stars or more.

The total time to collect a 2D COSY experiment is 3 hours.

A COSY experiment is a correlation spectroscopy experiment that uses two frequency dimensions and two time dimensions.

The time taken to collect a 2D COSY experiment is given by:Total acquisition time = (nr of scans * acquisition time per scan) + relaxation delays + preparation timeThus, the number of scans = 16 per t1 increment.The total number of increments = 51 msec / 0.2 msec = 255.The FID is collected for 1.0 sec.Relaxation delays are typically 1.5 times the repetition delay, which is 2 times the acquisition time per scan. Therefore, relaxation delays = 1.5 × 2 × (2 * 0.2 msec) = 1.2 msecPreparation time = 4 sec. 

Acquisition time per scan = 2 * 0.2 msec = 0.4 msec. Therefore, the total acquisition time = (16 * 0.4 msec * 255) + (1.2 msec * 255) + 4 sec + 1 sec = 58.32 min = 0.972 hoursThus, the total time taken to collect a 2D COSY experiment is 3 hours.

Summary:The total time to collect a 2D COSY experiment is 3 hours.

Learn more about dimensions click here:

https://brainly.com/question/27404871

#SPJ11

Answer:

I hope this helps you

:)

President Franklin D. Roosevelt put together an alliance of more than two dozen countries and started to move a half a million men and almost four million tons of equipment halfway around the world to fight against the Axis powers during World War II.

During World War II, President Franklin D. Roosevelt played a crucial role in forming the Allied Powers, a coalition of countries united against the Axis powers led by Germany, Italy, and Japan. This alliance included more than two dozen nations and aimed to combat the aggression and expansionist policies of the Axis powers.

To effectively engage in the war, Roosevelt initiated a massive logistical operation to transport troops and equipment across vast distances, preparing for military operations on multiple fronts. The movement of a half a million men and nearly four million tons of equipment demonstrated the immense scale and effort required to mobilize and deploy forces on a global scale.

You can learn more about World War II at

https://brainly.com/question/651584

#SPJ11

Reactions according to Bronsted are those in which there is an exchange of H+ ions. The Bronsted acid will be the substance that donates H+ ions and the base will be the compound that receives them.

As a result we will have a conjugated acid and a conjugated base. The conjugate acid will be the former base that just received the H+ ions. The conjugate base will be the former acid that donated its H+ ions.

Now let's look at the reaction. On the reactants side the compound that can donate H+ ions will be HSO3- and the compound CN- will be the one that receives them. Therefore, HSO3 will be the Bronsted acid (A) and CN will be the base (B).

HSO3 ---> A

CN -----> B

Now let's look at the product side. The compound that received the H+ ions will be the compound HCN, so this will be the conjugate acid (Ac). And the compound that lost its H+ ions is SO3, so it will be the conjugate base (Bc).

HCN --->Ac

SO3 ---->Bc

Comparing the analysis that we did with the reaction we will have that:

So, the answer will be option number 5

According to the question In the iodination of salicylamide, the nucleophile is NaI.

Salicylamide is a chemical compound that is related to aspirin and is used in a number of over-the-counter medications. It is an aromatic, white, crystalline solid that is slightly soluble in water. Salicylamide is used to reduce fever and pain, and is also used topically to treat skin irritations, such as sunburn and insect bites. In combination with other drugs, salicylamide is also used to treat a variety of conditions, including arthritis, headaches, and fever. It is also used in some cosmetic creams and shampoos. Salicylamide is generally considered safe and non-toxic when taken as directed. However, it can cause some side effects, such as stomach upset, nausea, and dizziness.

NaI acts as a source of iodide ions which can react with salicylamide to form the iodinated product. NaOCl, salicylamide, ethanol, and \(Na_2S_2O_3\) are not acting as nucleophiles in this reaction.

Therefore the correct option is B.

To learn more about salicylamide

https://brainly.com/question/26722892

#SPJ4

Answer:

cutting, bending, dissolving, freezing, and boiling

Explanation:

A physical change is a change in one or more physical properties of matter without any change in chemical properties. In other words, matter doesn't change into a different substance in a physical change. Examples of physical change include but are not limited to, from solid to liquid or from liquid to gas are also physical changes.

The solubility of calcite decreases with increasing water temperature, this can help in washing clothes as the calcite will get deposited at the bottom because of its less solubility and clothes can be washed easily.

Calcite also known as calcium carbonate is nearly insoluble in water because of the strong electrostatic force of attraction that exists in the calcium carbonate molecules. Thus, when a system's water temperature rises, less carbon dioxide (CO₂) dissolves in the water, which leads to calcite precipitating. The degree of solubility of calcium carbonate falls as the water temperature rises.

Hence, when the temperature rises the calcite precipitates and thus gets deposits at the bottom, and hence for hard water circumstances, which have an acidic environment, calcium carbonate soaps are excellent. To eliminate undesirable, intractable stains, calcium carbonate generates an alkaline medium that is perfect for detergents. Thus clothes are washed easily.

To learn more about  solubility visit the link:

https://brainly.com/question/13372319?referrer=searchResults

#SPJ9

Answer:

observation

Explanation:

Observation: copper carbonate is a green solid and product CuO is a black solid. Hence, green color disappears, and black color appears. (a) copper nitrate. (b) copper carbonate.