A certain bimolecular reaction at 40 °C at an activation energy of 30 kJ/mol. The addition of a catalyst reduces the activation energy by a factor of 2. How much faster does the catalyzed occur?
Select one:
OA. 318.63
OB. 358.63
C. 338.63
OD. 378.63

Answer:

1:3

Explanation:

nitrogen and hydrogen combine qt high pressure and temperature to form ammonia gas.this method is used to prepare ammonia industrially and the process is called haber's process.

the balanced equation is given as:

N2+3H2=>2NH3

we can see that 1 mole of nitrogen combines with 3 moles of hydrogen to produce 2 moles of ammonia.

hence ratio of nitrogen and hydrogen molecules should be 1:3 for reactants to get used up completely.

I hope it's helpful!

Answer:

cotton

Explanation:

which is typically spun into fine yarn for mechanical weaving or knitting into cloth.

Answer:

Energy, more.

Explanation:

wavenumbers are directly proportional to energy and frequency of the radiation means that if one increases the other automatically increases whereas one decreases the other is also decreases. If the wavenumber increases, the energy of radiation is also increases while on the other hand, if the wavenumber decreases the frequency and energy of radiation is also decreases.

The relation between the volume and the pressure of the gas can be given by the ideal gas equation. Warm air has more volume and low pressure that makes them rise above the equator.

Pressure present and exerted by the atmospheric gases are called atmospheric pressure. The volume of the gas is in inverse relation to the pressure of the gas.

Warm air has a high volume compared to cold air. More volume results in low pressure making them rise above the dense layer of the equator region.

Therefore, the warm air rises due to a decrease in pressure.

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Answer:

No, your missing some bonds

Answer:

Explanation:

A homogeneous mixture consists of one single phase while a heterogeneous mixture consists of two or more phases.

Answer:

7.859 g/cm³.

Explanation:

Density = Mass/Volume

the mass of the iron sample is 27.3162g and its volume is 3.475 cm³, so calculate its density as:

Density = 27.3162g/3.475 cm³ = 7.859 g/cm³

Therefore, the density of the iron sample is 7.859 g/cm³.

Answer:

1.an alloy is a mixture of chemical elements of which at least one is metal

Answer:

C₂ = 50 mg/L

C₃ = 42.5 mg/L

Explanation:

To do this, we just need to use the following expression:

C₁V₁ = C₂V₂     (1)

Where:

C₁: Original concentration of the Iron solution (mg/L)

V₁: aliquot of the iron solution (mL or L)

C₂: Concentration of the iron after beind dilluted (mg/L)

V₂: Volume of the flask that's being used.

Using the above expression, we just solve for C₂:

C₂ = C₁V₁ / V₂   (2)

We have the required volumes, but we do not have the concentration of the iron solution (C₁). To determine this, we use the initial flask of 100 mL and the mass of the iron:

C₁ = 25 mg / 0.1 L = 250 mg/L

With this value, we can replace in (2) to get the concentration on each flask.

Flask 1:

We have an aliquot of 20 mL, and it was dilluted to 100 mL, the concentration would be:

C₂ = 250 mg/L * (20/100)

Flask 2:

We have an aliquot of 17 mL dilluted to 100 mL so:

C₃ = 250 * (17/100)

Hope this helps

The concentration of iron in mg/L in each of the two flasks is 50 mg/l and 42.5 mg/L respectively.

The initial concentration of iron in the sample is obtained as follows:

A vitamin tablet containing 25 mg of iron is dissolved in 6M HCl and then made up to 100 mL in a 100 mL volumetric flask with DI water.

Concentration of iron in the solution = 25 mg/ 100 mL

Converting to mg/L; 1 L = 1000 mL, then 100 mL = 1000 * 1 L/ 1000 mL = 0.1 L

Concentration of iron in the solution in mg/L = 25 mg / 0.1 L = 250 mg/L

Then 20 mL and 17 mL of this solution were pipetted into separate 100 mL volumetric flasks and each of these was brought up to 100 mL volume by diluting with DI water to the mark.

Using the dilution formula C₁V₁ = C₂V₂ to determine the concentration of iron in each of these flasks:

C₁ = initial concentration; V₁ = initial volume

C₂ = final concentration; V₂ = final volume

Flask 1:

C₁ = 250 mg/L, V₁ = 20 mL, C₂ = ?, V₂ = 100 mL

C₂ = C₁V₁ / V₂

C₂ = 250 * 20 / 100

C₂ = 50 mg/L

Flask 2:

C₁ = 250 mg/L, V₁ = 17 mL, C₂ = ?, V₂ = 100 mL

C₂ = C₁V₁ / V₂

C₂ = 250 * 17 / 100

C₂ = 42.5 mg/L

Therefore, the concentration of iron in mg/L in each of the two flasks is 50 mg/l and 42.5 mg/L respectively.

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The mass percent of iron in the mixture is 29.43%.

What is mass percent?

Mass percent, also known as percent by mass, is a way of expressing the concentration of a solute in a solution, or the composition of a mixture, in terms of the mass of the solute or component relative to the total mass of the solution or mixture, multiplied by 100%.

To determine the mass percent of iron in the mixture, we need to use the formula:

mass percent = (mass of iron / total mass of mixture) x 100%

We are given that the mass of the iron is 1.213 g, and the total mass of the mixture is 4.123 g.

So, substituting these values into the formula:

mass percent = (1.213 g / 4.123 g) x 100%

mass percent = 29.43%

Therefore, the mass percent of iron in the mixture is 29.43%.

What is concentration of solution?

Concentration of a solution is the amount of solute dissolved in a given amount of solvent, and is usually expressed as a unit of measure per volume or mass of the solution. The most commonly used units of concentration include molarity, molality, mass percent, volume percent, and parts per million.

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Answer:

The solubility of alkaline earth metal hydroxides in water increases down the group because the size of the metal cation increases as you move down the group. This increase in size results in a decrease in the cation's charge density, which makes it less able to attract and hold onto hydroxide ions. As a result, the hydroxides become more soluble in water as you move down the group. Additionally, the lattice energies of the hydroxides decrease down the group, making it easier to break apart the crystal lattice structure and dissolve the hydroxides in water.

The elevated ridges of the brain are called gyri. Motor cortex are patches of gray matter that regulate skeletal muscle movement.

Cerebral cortex is the gray matter is located in the outermost region of the brain involved with integration.

Corpus callosum are large fiber tracts that allow the two hemispheres to communicate with each other.

The elevated ridges of the brain are called the gyri. Motor cortex are patches of gray matter that regulate skeletal muscle movement.

Cerebral cortex is the gray matter is located in the outermost region of the brain involved with integration. Corpus callosum are large fiber tracts that allow the two hemispheres to communicate with each other.

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Answer:

Preventing erosion – Land Reclamation

Protecting nesting areas – Protecting Biodiversity

Preventing littering – Land Reclamation

Preventing habitat disruption – Protecting Biodiversity

Protecting native species – Protecting Biodiversity

Preventing contamination of soil – Land Reclamation

Explanation:

I really hope I'm right! I tried my hardest, please give me brainliest :)

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The number of values greater than or equal to 8  is  mathematically given as

x = 27

This is further explained below.

Generally, Simply put, data sets are groups of information. When dealing with tabular information, a data set is analogous to one or more database tables, where each column represents a different variable and each row represents a separate record.

In conclusion, the total amount of numbers that are either more than or equal to 8

Data value 8 is only exceeded by 9, 10, 11, and 12.

Hence

x= 4+6+8+4+5

x = 27

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The highest electric force exerted by charges -4 ×10⁻⁵ C and 3 ×10⁻⁵ C  placed 0.5 m apart is equal to 43.15 N.

The lowest electric force exerted by charges 3 ×10⁻⁵ C and 3 ×10⁻⁵ C  placed 1 m apart is equal to 8.10 N.

According to Coulomb’s law, the force of attraction between two charges is equal to the product of their charges and is inversely proportional to the square of the distance. This electric force applies along the line joining the two charges.

The magnitude of the electric force can be written as follows:

\(\displaystyle F = k\frac{q_1q_2}{r^2}\)

where k is constant proportionality = 8.99 × 10⁹ N.m²/C².

Given the charge on one point charge, q₁ =  4 ×10⁻⁵ C

The charge on the other point charge, q₂ = - 3 × 10⁻⁵C

The distance between these two charges, r = 0.5 m

The magnitude of electric force between the charges  will be:

\(\displaystyle F = 8.99\times 10^{9}\times \frac{4\times 10^{-5}\times 3\times 10^{-5}}{(0.5)^2}\)

F = 43.15 N

Given the charge on one point charge, q₁ =  3 ×10⁻⁵ C

The charge on the other point charge, q₂ = 3 × 10⁻⁵C

The distance between these two charges, r = 1 m

The magnitude of force between the charges will be:

\(\displaystyle F = 8.99\times 10^{9}\times \frac{3\times 10^{-5}\times 3\times 10^{-5}}{(1)^2}\)

F = 8.1 N

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Answer:

177.3 meters per second

Explanation:

Assuming that both gases are at the same temperature, we can use Graham's law to calculate the ratio of the average speeds of N2 and He molecules:

(ratio of speeds) = sqrt(molar mass of He/molar mass of N2)

The molar mass of N2 is 28.02 g/mol, and the molar mass of He is 4.00 g/mol. Therefore:

(ratio of speeds) = sqrt(4.00/28.02) = 0.379

We know that the average speed of N2 molecules is 468 m/s. Therefore:

(average speed of He molecules) = (ratio of speeds) x (average speed of N2 molecules) = 0.379 x 468 m/s = 177.3 m/s

Therefore, the average speed of He molecules at the same temperature is approximately 177.3 meters per second.

Answer:

Radiation

Explanation:

The water in a garden hose flows at a rate of 10.0 liters per minute. Therefore, 158 gal/hr is the flow rate in gallons per hour.

Flow rate is the amount of liquid that travels in a given length of time. Furthermore, the flow rate is affected by the channel through which the liquid is travelling, the area of the pipe, as well as the velocity of something like the liquid. Furthermore, the formula is. Fluid dynamic rate = pipe or channel area x liquid velocity.

The volume flow value is the rate of liquid (water flow rate formula) passing through every place in an area over time.

1 gal = 3.79 L

60 min = 1 hr

10.0 L/min x 60 min/hr x 1 gal/3.79 L = 158 gal/hr

Therefore, 158 gal/hr is the flow rate in gallons per hour.

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Answer:

Option D. 1–chloro–3–methylbenzene

Explanation:

To name the compound given in question above, the following must be observed:

1. Determine the functional group of compound.

2. Identify the substituent group attached to the compound.

3. Identify the position of the substituent group by giving it the lowest possible count.

NOTE: numbering is done alphabetically.

4. Combine the above to obtain the name

Now, we can obtain the name of the compound as follow:

1. The compound is an aromatic compound with the benzene ring.

2. The substituent groups attached to compound are:

I. Chlorine (Cl)

II. Methyl (–CH₃)

3. The position of the substituent group attached are:

I. Chlorine is located at carbon 1

II. Methyl (–CH₃) is located at carbon 3

4. The name of the compound is:

1–chloro–3–methylbenzene

Answer:

mass in gram = 642.6 g

Explanation:

Given data:

Density of aluminum = 2.70 g/mL

Volume of aluminum = 238 mL

Mass in gram = ?

Solution:

Density:

Density is equal to the mass of substance divided by its volume.  The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

d =m/v

d = density

m=mass

V=volume

Now we will put the values in formula.

2.70 g/mL = m/ 238 mL

m = 2.70 g/mL × 238 mL

m = 642.6 g

Showcase of 2-butene's cis/trans isomerism. Cis-trans isomerism can only be seen in compounds that have a double bond and at least two distinct substituents on either side.

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The pH value of 500 mL of an aqueous solution of 0.005 mole HCl is 2

We'll begin our calculations by obtaining the molarity of the solution. Details below:

Molarity = mole / volume

Molarity = 0.005 / 0.50

Molarity = 0.01 M

Next, we shall obtain the concentration of the hydrogen ion, H⁺ in the solution. Details below:

HCl(aq) <=> H⁺(aq) + Cl¯(aq)

From the balanced equation above,

1 mole of HCl contains 1 mole of H⁺

Therefore,

0.01 M HCl will also contain 0.01 M H⁺

Thus, the concentration of the hydrogen ion, H⁺ in the solution is 0.01 M

Finally, we shall determine the pH of the solution. Details below:

pH = -Log H⁺

pH = -Log 0.01

pH = 2

Thus, we can conclude that the pH of the solution is 2

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The electron donor is \(H_2\).

The electron acceptor is \(NAD^+\)

When the electron donor loses the electron, it becomes oxidized.

When the electron acceptor accepts the electron, it becomes reduced.

Overall, the electron travels from H to  \(NAD^+\).

Oxidation is defined as:

Reduction is defined as:

Looking at the reaction, \(NAD^+\) gained hydrogen or an electron to become NADH. this means that NADH has been reduced. The reducing agent or the electron donor is \(H_2\) .

Thus, the electron acceptor is \(NAD^+\). When the electron donor, \(H_2\), loses the electron, it becomes oxidized to \(H^+\).

When the electron acceptor, \(NAD^+\), accepts the electron, it becomes NADH.

This means that electron travels from  \(H_2\) to \(NAD^+\)

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The percent dissociation of acetic acid (CH,CO,H) in a 0.60 mM aqueous solution is 98.38%.

When 0.60 mM of acetic acid (CH3COOH) is dissolved in water, it dissociates according to the following equation:

CH3COOH(aq) ↔ H+(aq) + CH3COO-(aq)

The percent dissociation of acetic acid (CH3COOH) in the aqueous solution is calculated using the following equation:

% dissociation = [H+]/[CH3COOH] × 100

where [H+] is the concentration of the hydrogen ion and [CH3COOH] is the concentration of the acetic acid.

1. To calculate the concentration of the hydrogen ion in the solution, we need to use the equilibrium constant expression for the dissociation of acetic acid, which is:

Ka = [H+][CH3COO-]/[CH3COOH]

where Ka is the acid dissociation constant for acetic acid.

2. To calculate the concentration of the hydrogen ion in the solution, we need to use the quadratic formula, since the dissociation of acetic acid is incomplete:

% dissociation = (1 - α) × 100

where α is the degree of dissociation of acetic acid.

Since α is small, we can assume that the change in the concentration of acetic acid is negligible.

Thus,[H+] = α[CH3COOH]

3. Substituting the values, we get:

Ka = [H+][CH3COO-]/[CH3COOH][H+] = Ka × [CH3COOH]/[CH3COO-]α = [H+]/[CH3COOH] = Ka × [CH3COOH]/([CH3COOH] + [CH3COO-])α

= (1.74 × 10-5) × (0.60 × 10-3)/(0.60 × 10-3 + 0.64 × 10-3)α

= 0.0162% dissociation

= (1 - α) × 100% dissociation

= (1 - 0.0162) × 100% dissociation

= 98.38%

The percent dissociation of acetic acid (CH3COOH) in the aqueous solution is 98.38%.

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The given statement "A parasitic way of life can be best demonstrated by the feeding adaptations of the spider." is False. Because, While some spiders are parasites, not all spiders are parasitic.

Additionally, many spiders are not even true parasites, as they typically do not harm their host organism. Spiders are typically classified as predators, as they feed on other insects and arthropods. While some spiders may occasionally feed on the blood of larger animals, such as birds or mammals, this behavior is not typically considered parasitic, as it does not involve a long-term relationship between the spider and the host organism.

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Answer:

i want to help but  i   d   k. the answer :( sorry i couldnt help

Explanation:

The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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Answer:

Clouds are not made of liquid water but they hold liquid water, and when the pool of liquid water that fills the inside of clouds gets too large for the cloud to hold, the cloud releases the water as rain. ... Rain does not fall from clouds.

Explanation:

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