At body temperature (37°C), the rate constant of an enzymecatalyzed decomposition is 2.3X10¹⁴ times that of the uncatalyzed reaction. If the frequency factor, A, is the same for both processes, by how much does the enzyme lower the Ea?

To prepare a 200.0 ml aqueous solution of 5.0M NaCl, grams of nacl is 10g.

(w/v) % = 5

Volume = 200 mL

Hence, mass of NaCl=200×5/100 = 10g

What is an aqueous solution?

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The osmotic pressure of the solution is approximately 247 kPa. Thus, the correct answer is option a. 247 kPa.

To calculate the osmotic pressure of the solution, we can use the formula:

π = MRT

Where:

π = osmotic pressure

M = molarity of the solute

R = ideal gas constant (8.314 L kPa K^(-1) mol^(-1))

T = temperature in Kelvin

First, let's calculate the molarity (M) of the urea solution:

Molarity (M) = moles of solute / volume of solution (in liters)

Moles of urea = mass of urea / molar mass of urea

Molar mass of urea = 60.06 g/mol

Moles of urea = 18.0 g / 60.06 g/mol = 0.2998 mol

Molarity (M) = 0.2998 mol / 3.00 L = 0.0999 M

Now we can calculate the osmotic pressure using the given values:

T = 25 °C = 25 + 273.15 K = 298.15 K

π = (0.0999 M) * (8.314 L kPa K^(-1) mol^(-1)) * (298.15 K)

π ≈ 247 kPa

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Answer:

Chemistry is the study of matter. Matter is made up of extremely tiny particles called atoms and molecules. Atoms and molecules make up the three common states of matter on Earth—solids, liquids, and gases. The particles of a liquid are attracted to one another, are in motion, and are able to move past one another.

Explanation:

Answer:

Substance that are used in the reaction

Explanation:

I hope this will help you

Answer:

Substances that are used in the reaction. Hope my answer helps you!

The value that would be put in the numerator of this calibration would be 10° C .

The process of calibrating an instrument involves setting it up such that it can produce results for samples that are within a reasonable range. A key component of instrumentation design is eliminating or reducing conditions that lead to faulty measurements.

In order to ascertain the mistake or confirm the precision of the unknown value of the DUT, a calibration is normally carried out. As a simple illustration, you may calibrate a DUT thermometer by measuring its temperature in water at its known boiling point (212 degrees Fahrenheit) in order to determine the thermometer's inaccuracy.

To obtain accurate readings, a thermometer must be calibrated because its precision is susceptible to deterioration over time. Thermometers can change over time for a variety of reasons.

Hence, The value that would be put in the numerator would be 10° C because difference between two marked values or space between two marked value is 10.

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Answer:

When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide.

Explanation:

Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.

Exercise is characterized as a physiological movement that maintains or enhances total physical wellness. People who exercise are less likely to get diseases and to maintain a healthy weight. Type 2 diabetes, heart disease, high blood pressure, and weight gain can all be warded off with regular exercise. Leaping, jogging, or lifting weights are examples of exercises that can support bone health.

The lungs both provide the body with oxygen, which gives you energy, and remove carbon dioxide from the system, which is a byproduct of energy production. The heart pumps oxygen-rich blood to the working muscles. Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.

Thus, because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.

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Answer:

1. Sulphuric acid

2. Car battery acid

3. Washing up liquid

4. Milk of magnesia

5. Metal polish

6. Oven cleaner

Explanation:

Universal paper can determine the pH of a solution. It ranges from dark red (pH 0 - very acidic) to orange/yellow, to green (pH 7 - neutral) to blue, dark blue and purple (pH 14 - very alkaline)

Sulphuric acid has the lowest pH as the universal indicator is red.

The next is car battery acid which is pink - not as acidic as red.

The next is washing up liquid, which is yellow, around pH 3 or 4.

The next is milk of magnesia with light blue, around pH 9 or 10.

Metal polish is dark blue - around pH 11.

Oven cleaner is the darkest, with purple.

To find the density of the unknown gas, we can use the ideal gas law equation:

PV = nRT

Where:

P = Pressure (in atm)

V = Volume (in L)

n = Number of moles

R = Ideal gas constant (0.0821 L·atm/(mol·K))

T = Temperature (in K)

We are given:

Molar mass of the gas (M) = 44.01 g/mol

Pressure (P) = 0.852 atm

Temperature (T) = 77.8 °C = 77.8 + 273.15 = 350.95 K

First, we need to calculate the number of moles (n) of the gas using the molar mass and the ideal gas equation:

n = m/M

where:

m = mass of the gas

Since the mass is not given, we cannot directly calculate the density. Therefore, without the mass of the gas, we cannot determine its density. None of the options provided in the question match the correct density value since we cannot perform the calculation.

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Find the density of an unknown gas (in g/L), which has a molar mass of 44.01 g/mol, with an ambient air pressure of 0.852 atm at 77.8 oC.

Question 18 options:

1.835

0.740

1.263

1.426

1.302

Answer:

Liquids have more kinetic energy than solids. When a substance increases in temperature, heat is being added, and its particles are gaining kinetic energy. Because of their close proximity to one another, liquid and solid particles experience intermolecular forces. These forces keep particles close together.

Explanation:

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A decrease of pH by 3 implies :C) The OH- concentration decreases by a factor of 1000.

pH is a scale used to determine the hydroxide ion (OH–) concentration in a solution. It is equal to the negative log of hydrogen ion (H+) concentration and is also equal to the negative log of hydroxide ion (OH– ) concentration. As the pH of a solution increases by one pH unit,  concentration of OH- increases by ten times.

When the value of pOH is less than 7, then it is considered basic and therefore there are more OH- than H+ in the solution. At pH 7, the substance is at neutral and means that the concentration of H+ and OH- ion is same. If pH < 7, then solution is acidic.

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1.  We can see here that energy is required to change the phase of matter. For example, energy is required to melt ice, vaporize water, and condense steam. The amount of energy required to change the phase of matter is called the latent heat.

Energy is a fundamental concept in physics and refers to the ability or capacity of a system to do work or produce a change.

2. The demonstration on the sample of water showed that water can exist in three phases: solid, liquid, and gas. The solid phase is ice, the liquid phase is water, and the gas phase is steam.

The demonstration started with ice at 0°C. As heat was added to the ice, the temperature of the ice increased. However, the ice did not melt until the temperature reached 0°C. This is because the energy from the heat was used to break the bonds between the water molecules in the ice. Once the bonds were broken, the ice melted and became water.

3. Completing the

Page 4:

Heating and cooling curves are graphical representations of how temperature changes during the process of heating or cooling a substance. They illustrate the relationship between temperature and the state of matter.

Both curves show:

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Answer: False

Explanation: Gaining an electron which has a negative charge results in an overall negative charge, thus making this an anion, and the answer, false.

Answer:false

Explanation:it becomes a anion

When lithium is heated in the presence of oxygen, it undergoes a redox reaction to form lithium oxide,\(Li$_2$O\). This reaction involves the transfer of electrons from the lithium atoms to the oxygen atoms to form a stable compound.

The balanced chemical equation for this reaction is:

\(4 Li + O$_2$ → 2 Li$_2$O\)

In this reaction, four lithium atoms react with one molecule of oxygen to produce two molecules of lithium oxide. Lithium oxide is a white crystalline solid that is insoluble in water and is a powerful reducing agent.

It is commonly used in the production of ceramics, glasses, and lithium-ion batteries. The formation of lithium oxide is an important reaction, and it is utilized in many industrial and technological processes.

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Answer:volume

i think

Explanation:

Answer:

Fair Labor Standards Act

Explanation:

It is correct. I just took the test on Clever

Answer:

I would say it’s B

Explanation:

The approximate degree of dissociation is 4.45%.

Degree of dissociation:

The degree of dissociation is the phenomenon of generating current-carrying free ions, which are dissociated from the fraction of solute at a given concentration.

The degree of dissociation is another way of determining the strength of a base. It indicates the fatty acids that were released from a base when it dissociates in water.

The formula for degree of dissociation:

α λ λ α λ λ α = λ c λ 0

where λ λ λ c is the molar conductivity of weak electrolyte at “C” (concentration)

λ λ λ 0 is the molar conductivity of weak electrolyte at "0".

Ka = C∝²

∝ = \(\sqrt{\frac{Ka}{C} }\)

Ka = \(10^{-3.08}\) = 8.32×\(10^{-4}\)

C = 0.42

Putting these values in the equation we have:

∝ = \(\sqrt{\frac{8.32 * 10^{-4} }{0.42} }\)

   = 4.449 ×\(10^{-2}\)

   = 0.04449

The degree of dissociation is 4.45%

Therefore the degree of dissociation is 4.45%.

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Answer:

I'd probably say both. It physically changes because it creates CO2. It chemically changes because they are basically working together for the atoms to rearrange and creates a chemical reaction.

Explanation:

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Answer:

Wetlands trap the surface water, snowmelt, rain, groundwater, and flood water. They then slowly release the water. Wetland vegetations like trees and root mats also help in controlling the speed of flood water and release it slowly on the floodplain.

Explanation:

Sulfuric acid reacts with the mineral ilmenite to form titanium(IV) oxide (TiO2), a white material. The reaction has a Percentage of yield 76.3%.

The amount of product actually made compared with the maximum calculated yield is called the percentage yield.

Actual yield/Theoretical yield*100

FeTiO3 + H2SO4 -> TiO2 + FeSO4 + H2O

Molar mass of FeTiO3 = 152 g / mole

Number of mole of FeTiO3 = Mass / molar mass

= 8.65 x 10³ / 152

= 56907 g / mole

By solving the equation

Number of moles of TiO2 = 56907 g / mole

Mass of TiO2 = molar mass x number of moles

= 80 x 56907

= 4552560 = 4.55 x 10³

Percent yield = 3.47 x 10³ / 4.55 x 10³ x 100

 = 0.763 x 100

 = 76.3 %

Thus, Titanium(IV) oxide (TiO2) is a white substance produced by the action of sulfuric acid on the mineral ilmenite. The percent yield of the reaction is 76.3%.

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Neutralization reactions involve the reaction of an acid and a base to form a salt and water. These reactions typically result in a change in pH from acidic to neutral or basic. If the starting solution is acidic, the addition of a base will increase the pH and cause the solution to become more basic. If the starting solution is basic, the addition of acid will decrease the pH and cause the solution to become more acidic.

The BTB (bromothymol blue) indicator is a pH indicator that changes color from yellow (acidic) to blue (basic) in the presence of a base. It is commonly used to indicate the endpoint of a titration, where a solution of known concentration is added to a solution of unknown concentration until the reaction is complete.

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Answer:

The stomach.

Explanation:

The vacuole is like the stomach because it stores food and water for later use. This allows the body and or cell to get energy when needed.

The law of conservation of energy has not been broken, provided energy is released from the fission process.

The law states that the total energy of a process is conserved. That is, the total energy or mass of a system before and after undergoing processing remains the same. However, some of the mass/energy can be converted to another form.

When a material undergoes fission, the sum total of the mass of the particles formed should be equal to the mass of the starting materials, provided that all other things remain the same.

However, if energy is released from the fission process, it means that some of the mass of the starting materials has been converted to energy and released to the environment.

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As the system approaches equilibrium, entropy is near its maximum.

The entropy is said to be the degree of disorderliness of a system. Ice is a crystal in which the molecules are perfectly ordered so its entropy is at a minimum.

As ice melts, the molecules gain more energy and separate from each other. There is now an increase of particles in the system leading to an increase in entropy.

Hence, when the system is at equilibrium, entropy is at a maximum.

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4.37 grams of O₂ will be left over after the reaction is complete.

The balanced chemical equation for the reaction is:

4NO₂ + O₂→ 2N₂O₅

From the equation, we can see that 4 moles of NO and 1 mole of O₂ react to form 2 moles of N₂O₅.

To find the amount of each reactant and product in the reaction, we need to first calculate the number of moles of each substance. We can use the molecular weight of each substance to convert the given mass into moles.

The molecular weights of the substances are:

NO₂ = 46.0055 g/mol

O₂ = 31.9988 g/mol

N₂O₅ = 108.0104 g/mol

Number of moles of NO₂ = 5.31 g / 46.0055 g/mol = 0.1156 mol

Number of moles of O₂ = 5.31 g / 31.9988 g/mol = 0.1659 mol

According to the balanced chemical equation, 4 moles of NO₂ react with 1 mole of O₂ to produce 2 moles of N₂O₅.

Therefore, the limiting reactant is NO₂ because there are only 0.1156 mol of it available, while there are 0.1659 mol of O₂ available. This means that all of the NO₂ will be used up, and there will be some excess O₂ left over.

To calculate the amount of N₂O₅ produced, we can use the mole ratio from the balanced chemical equation:

4 mol NO₂ : 1 mol O₂ : 2 mol N₂O₅

Since we know that 0.1156 mol of NO₂ will be used up, we can use the mole ratio to calculate the amount of N₂O₅

produced:

0.1156 mol NO₂ x (2 mol N₂O₅ / 4 mol NO₂) = 0.0578 mol N₂O₅

To find the mass of N₂O₅ produced, we can use the molecular weight:

0.0578 mol N₂O₅ x 108.0104 g/mol = 6.24 g N₂O5

Therefore, 6.24 grams of N₂O₅ will be produced, and there will be some excess O₂ left over. To calculate the amount of O₂ left over, we can use the mole ratio from the balanced chemical equation:

4 mol NO2 : 1 mol O₂ : 2 mol N₂O₅

Since we know that 0.1156 mol of NO₂ will be used up, we can use the mole ratio to calculate the amount of O₂  required:

0.1156 mol NO₂ x (1 mol O₂ / 4 mol NO₂) = 0.0289 mol O₂

Therefore, the amount of O₂ left over is:

0.1659 mol O₂ - 0.0289 mol O₂ = 0.1370 mol O₂

To find the mass of O₂ left over, we can use the molecular weight:

0.1370 mol O₂ x 31.9988 g/mol = 4.37 g O₂

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A balance can be used to measure the amount of gas being produced by measuring the change in mass before and after the gas is released.

To measure the amount of gas produced, a closed container or reaction vessel is placed on the balance. The initial mass of the container, including the reactants, is recorded. As the reaction proceeds and gas is produced, the total mass inside the container decreases.

By monitoring the change in mass over time, one can determine the amount of gas being produced. The mass difference is attributed to the mass of the gas generated during the reaction.

It is essential to ensure that the reaction vessel is airtight and that no gas escapes during the process. By using a precise and sensitive balance, even small changes in mass can be accurately measured.

This method is commonly used in experiments where the gas produced is difficult to capture directly or when determining the stoichiometry of a reaction involving gases. The balance provides a direct and quantitative measurement of the gas production by monitoring the change in mass.

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Answer:

Diffusion :  

the spreading of something more widely.

-AND-

Thermal energy, or heat, is the energy that comes from the movement of atoms and molecules in a substance. Heat increases when these particles move faster. Geothermal energy is the thermal energy in the earth. Motion energy is energy stored in the movement of objects.

Explanation:

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The mass of helium in the tire is 0.0452 g. To calculate the mass of helium in the tire, we need to use the ideal gas law, which relates the pressure, volume, and temperature of a gas to its number of moles and therefore its mass: PV = nRT

To calculate the mass of helium in the tire, we need to use the ideal gas law, which relates the pressure, volume, and temperature of a gas to its number of moles and therefore its mass:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the temperature.

We know the pressure, volume, and temperature of the helium in the tire, so we can solve for the number of moles of helium:

n = PV/RT

where R = 0.08206 L atm/K mol is the universal gas constant.

Substituting the values given:

n = (7.80 atm) x (0.365 L) / [(0.08206 L atm/K mol) x (25°C + 273.15)]

n = 0.0113 mol

Finally, we can calculate the mass of the helium using the molar mass of helium, which is 4.003 g/mol:

mass = n x molar mass

mass = 0.0113 mol x 4.003 g/mol

mass = 0.0452 g

Therefore, the mass of helium in the tire is 0.0452 g.

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If the mass of the unknown solute is doubled, the freezing point depression will also double. This is because the amount of solute added to the solution is directly proportional to the change in the freezing point of the solution.

In other words, the greater the amount of solute added, the greater the freezing point depression. Therefore, doubling the mass of the solute will result in twice the amount of solute being added to the solution, which will cause the freezing point depression to double as well.

The relationship between the freezing point depression and the concentration of a solution is described by the equation: ΔTf = Kf·m

Assuming that the cryoscopic constant of heptane remains constant, we can rearrange the equation to solve for the molality: m = ΔTf/Kf

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