A certain first-order reaction has an activation energy of 83 kj/mol. if the rate constant for this reaction is 2.1 x 10-2 1/s at 150c, what is the rate constant at 300c?

2194.14is the new volume .These laws are described by equations that are variations on the ideal gas law, PV is nRT

Explanation:

The ideal gas law, PV = nRT,

97 * 0.975*29 = 2742.675/1.25 = 2194.14.    

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Answer:

perform multiple trials for each release height instead of just one

Explanation:

The mass of KI needed to prepare 500 mL of a 0. 750 M solution is 62.25 grams

To compute the mass of KI needed to prepare 500 mL of a 0.750 M solution, use the formula:

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

First, convert the volume to liters: 500 mL = 0.5 L

Next, rearrange the formula to find the moles of solute:

moles of solute = Molarity × volume of solution in liters
moles of KI = 0.750 M × 0.5 L
moles of KI = 0.375 moles

Now, find the molar mass of KI (Potassium Iodide):
K (Potassium) = 39.10 g/mol
I (Iodine) = 126.90 g/mol
Molar mass of KI = 39.10 g/mol + 126.90 g/mol = 166.00 g/mol

Finally, calculate the mass of KI needed:

mass of KI = moles of KI × molar mass of KI
mass of KI = 0.375 moles × 166.00 g/mol
mass of KI = 62.25 g

Therefore, you will need 62.25 grams of KI to prepare 500 mL of a 0.750 M solution.

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Answer:

I'm sorry, but I cannot see the observations or the data table you mentioned in your question. However, I can still provide you with some general guidance on how to approach the calculations and answer the questions based on the given information.

4. To calculate the concentration of the NaOH solution, you need to know the mass of NaOH used and the volume of the solution. The formula to calculate concentration is:

Concentration (in mol/L) = (Mass of NaOH (in grams) / molar mass of NaOH) / Volume of solution (in L)

Make sure to convert the mass of NaOH to moles by dividing it by the molar mass of NaOH. The molar mass of NaOH is the sum of the atomic masses of sodium (Na), oxygen (O), and hydrogen (H).

5. The balanced equation for the neutralization reaction between NaOH and HCl is:

NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

(aq) represents an aqueous solution, and (l) represents a liquid.

6a. To calculate the average concentration of HCl in the sample from site B, you need to know the volumes and concentrations of the NaOH and HCl solutions used in the titration. Use the formula:

Concentration of HCl (in mol/L) = (Volume of NaOH solution (in L) * Concentration of NaOH (in mol/L)) / Volume of HCl solution (in L)

Multiply the volume of NaOH solution used by its concentration to find the amount of NaOH used. Then, divide this amount by the volume of HCl solution used to find the concentration of HCl.

6b. To determine the pH of the water at site B, you need to know the concentration of HCl from the previous calculation. The pH can be calculated using the formula:

pH = -log10[H+]

Since HCl is a strong acid, it dissociates completely into H+ ions. Therefore, the concentration of H+ ions is equal to the concentration of HCl. Take the negative logarithm (base 10) of the H+ concentration to find the pH.

To check if the water is safe, compare the calculated pH value to the range provided (pH 4.5-7.5). If the pH falls within this range, the water is considered safe for plant and animal reproduction in an aquatic environment.

6c. Use a similar calculation as in 6a to determine the average concentration of HCl in the sample from site C.

6d. Use the concentration of HCl from 6c to calculate the pH using the formula in 6b. Follow the same procedure to check if the water is safe based on the pH range.

7. To find the most current pH value for the Grand River, you can search for the latest data from reliable sources such as environmental agencies, research institutions, or government websites. Compare this pH value to the pH values obtained in the experiment to assess the difference between them.

Remember, without the specific data and observations, the calculations and comparisons provided here are only general guidelines. It's important to use the actual data from your experiment to obtain accurate results and conclusions.

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Answer:

Water is also produced alongside salt

Besides salt, water is formed as the other product when an acid reacts with an alkali. The acid-alkali reaction is a type of neutralization reaction. When an acid reacts with an alkali, they both react to form salt and water.

Salts are ionic compounds that are composed of cations and anions held together by ionic bonds. Salts have positive and negative ions that are held together by ionic bonds. They have high melting and boiling points and are crystalline solids at room temperature.

Acids are substances that produce hydrogen ions, H+ when dissolved in water. They have a sour taste and turn blue litmus paper to red.

Alkalis are bases that dissolve in water to form hydroxide ions, OH-. They are usually soluble in water and can be identified by their bitter taste and ability to turn red litmus paper blue.

When acids and alkalis react, they undergo a neutralization reaction, which results in the formation of salt and water. In this reaction, hydrogen ions (H+) from the acid and hydroxide ions (OH-) from the alkali react with each other to form water (H₂O). The remaining ions from the acid and alkali combine to form a salt.

The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is an example of an acid-alkali reaction.

HCl + NaOH → NaCl + H₂O

Acid + alkali → salt + water

Hence, water is the other product that is formed when an acid reacts with an alkali, apart from salt.

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There are 294,336  minutes are in 0.56 yrs.

Minutes are a reputable recording of the court cases of a Board meeting Annual fashionable meeting or another meeting and the enterprise transacted on the meeting.

1 yr = 365 days

0.56 = 365 × 0.56

       = 204.4 days.

1 day = 24 hrs

204.4 days = 204.4 × 24

                  = 4905.6 hours

1 hr = 60 min

4905.6 hours =   4905.6 × 60

                    = 294,336 minutes.  

All agencies registered in India are required to maintain mins of all Board and Committee conferences in a minutes e-book. minutes may be created during the meeting with the aid of a typist or courtroom reporter, who might also use shorthand notation and then prepare the minutes and problem them to the contributors afterward.

Minutes are a tangible report of the meeting for its contributors and a source of facts for members who had been not able to wait. In a few cases, assembly mins can act as a reference point, as the instance when a meeting's outcomes affect different collaborative activities or initiatives inside the corporation

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Substance that is composed of two or more elements or compounds that are not chemically combined is called mixture.

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The volume occupy at 415K and 12.3atm is 37.25ml.

Ideal gas:

An ideal gas is a theoretical gas composed of many randomly moving point particles that are not subject to interparticle interactions. It is one for which both the volume of molecules and forces between the molecules are so small that they have no effect on the behavior of the gas.

Here we have to find the volume occupied.

The formula for an ideal gas:

P1 V1 / T1 = P2 V2 / T2

V2 = P1 V1 T2 / T1 P2

P1 = 14.8atm

P2 = 12.3atm

V1 = 23.5 ml

T1 = 315K

T2 = 415K

Now putting these values in the equation we get:

V2 = (14.8× 23.5 × 415)/ ( 12.3 × 315)

     = 144,337 / 3874.5

    = 37.25 ml

Therefore the 37.25ml is the volume.

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The main answer to your question is (E) a molecular solid.

A molecular solid is composed of individual molecules held together by intermolecular forces, such as London dispersion forces, dipole-dipole forces, and hydrogen bonding.

These intermolecular forces are not strong enough to allow the substance to conduct electricity in solution or when melted.

Additionally, the low melting point of the substance indicates that the intermolecular forces holding the molecules together are relatively weak.

Summary: The substance is likely a molecular solid, which does not conduct electricity in solution or when melted due to weak intermolecular forces between individual molecules.

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Halogenated compounds are particularly easy to identify by their mass spectra because chlorine and bromine occur naturally as mixtures of two abundant isotopes.

Chlorine occurs as 35Cl (75.8%) and 37Cl (24.2%); bromine occurs as 79Br (50.7%) and 81Br (49.3%).What is Chlorocyclohexane?Chlorocyclohexane is a chemical compound with the molecular formula C6H11Cl. It is a colorless liquid and a halogenated compound. The compound Chlorocyclohexane, C6H11Cl:What are the masses at which the molecular ions occur?The molar mass of Chlorocyclohexane is 120 g/mol.C6H11Cl is halogenated, meaning that it has a halogen atom in it, namely chlorine.

Therefore, when you are looking for a molecular ion, it must be equal to the molar mass of C6H11Cl + 1 (the extra hydrogen).Molecular ion = Molar mass of C6H11Cl + 1= 120 + 1= 121.The molecular ion peaks for C6H11Cl occur at mass numbers of 121 and 123. The molecular ions for C6H11Cl occur at 121 and 123 m/z because 75.8% of the Cl atoms will have a mass of 35 and 24.2% will have a mass of 37. Therefore, 75.8% of the chlorocyclohexane molecules will have a mass of 120+35=155 and 24.2% will have a mass of 120+37=157.

The percentages of each molecular ion are 75.8% and 24.2% respectively:155 = 75.8% of the molecular ions.157 = 24.2% of the molecular ions. The answer is:121, 123.75.8%, 24.2%.

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Allylic carbocation is the reactive intermediate in the reaction of 1,3-diene with hbr, resulting in 1,4-addition.

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The order of increasing atomic size is: F, Cl, K, Cs.

The atomic size or atomic radius is the distance between the nucleus and the outermost shell of an atom. The atomic size generally increases down a group and decreases across a period on the periodic table.

The given elements are F (fluorine), Cl (chlorine), K (potassium), and Cs (cesium).

Fluorine (F) has the smallest atomic radius because it is the top element of group 17 (halogens) and has the highest effective nuclear charge (the attractive force experienced by the valence electrons towards the nucleus). Chlorine (Cl) has a larger atomic radius than F because it is located below F in the same group.

Potassium (K) has a larger atomic radius than Cl because it is located in group 1 (alkali metals) below Cl. Finally, cesium (Cs) has the largest atomic radius among the given elements because it is located at the bottom of group 1 and has the least effective nuclear charge. Therefore, the order of increasing atomic size is F < Cl < K < Cs.

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Answer:

Electrochemical cells typically consist of two half-cells. The half-cells separate the oxidation half-reaction from the reduction half-reaction and make it possible for current to flow through an external wire.

Explanation:

The period between cell divisions is called interphase. The correct answer A.

Interphase is the period of the cell cycle that prepares the cell for division. It is comprised of three main stages:

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Answer:

the water repels the pencil

Explanation:

Since the an electrically charged pencil is placed close to the water running from a faucet :D

Answer:

Option 2

Explanation:

:)

Balanced equation = CS₂ + O₂ = 2CO₂ + SO₂ . The reaction's mass and charge are in balance on both sides.

An equation for a chemical reaction that has the same total charge and number of atoms for both the reactants and the products is called a balanced equation. To put it another way, the reaction's mass and charge are in balance on both sides.

A balanced chemical equation is one in which the mass of the reactants and the mass of the products are both equal to the number of atoms of each element on both sides of the equation.

To comply with the law of conservation of mass, which states that "Total mass of all the products of the reaction in a chemical reaction is equal to the total mass of all the reactants," the chemical equation must be balanced.

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Explanation:

Slow cool rate in coarse

Fast cool rate in fine

Answer:

c) how sedimentary rock forms

The average temperature is 17.0 °C.

The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature.

Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances. The most popular scales are the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), and the Kelvin scale (K), with the latter being mostly used for scientific purposes. One of the International System of Units' (SI) seven base units is the kelvin law of cosines.

The lowest point on the thermodynamic temperature scale is absolute zero, or zero kelvin, or 273.15 °C.

To find the average temperature, we add up the individual temperatures and divide by the total number of measurements. Let's calculate:

Average temperature = (16.9 + 17.0 + 17.1) / 3 = 51.0 / 3 = 17.0

Therefore, the average temperature is 17.0 °C.

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To solve this problem, we need to use the principles of stoichiometry and combustion thermodynamics. The A/F ratio is the air-to-fuel ratio by mass, and it is defined as the mass of air required to completely combust one unit mass of fuel. The dew point temperature is the temperature at which the water vapor in the combustion products begins to condense, and it depends on the composition and temperature of the products.

The A/F ratio can be calculated as follows:

First, we need to write the balanced chemical equation for the combustion of ethane:

C2H6 + 3.5 O2 + (0.2 x 3.5) O2 -> 2 CO2 + 3 H2O + (0.2 x 3.5) N2

Here, the 3.5 O2 represents the stoichiometric amount of oxygen required to completely combust one unit mass of ethane, and the 0.2 x 3.5 O2 represents the excess oxygen supplied (20% excess air). The (0.2 x 3.5) N2 represents the corresponding amount of nitrogen in the excess air.

The molecular weights of the reactants and products are:

C2H6: 2 x 12.01 + 6 x 1.01 = 30.07 g/mol

O2: 2 x 16.00 = 32.00 g/mol

CO2: 1 x 12.01 + 2 x 16.00 = 44.01 g/mol

H2O: 2 x 1.01 + 16.00 = 18.02 g/mol

N2: 2 x 14.01 = 28.02 g/mol

Using these values, we can calculate the mass of air required to combust one unit mass of ethane:

A/F = (mass of O2 + mass of N2) / mass of C2H6

= [(3.5 x 32.00) + (0.2 x 3.5 x 28.02)] / 30.07

= 12.53

Therefore, the A/F ratio is 12.53 by mass.

To determine the dew point temperature of the products, we need to calculate the mole fractions of the water vapor and nitrogen in the products, and then use a psychrometric chart or equations to find the dew point temperature. Alternatively, we can use the following simplified equation:

Tdp = (243.12 x ln(RH/100) + 17.62 x T) / (17.62 - ln(RH/100) - T)

Here, Tdp is the dew point temperature in °C, RH is the relative humidity of the products, and T is the temperature of the products in °C.

Assuming the combustion products are initially at a temperature of 25°C and a relative humidity of 100% (i.e., the products are fully saturated with water vapor), we can calculate the mole fractions of the water vapor and nitrogen as follows:

Mole fraction of H2O = (n H2O) / (n H2O + n N2)

= (3 x 0.2) / [(3 x 0.2) + (3.5 x 0.2)]

= 0.3

Mole fraction of N2 = (n N2) / (n H2O + n N2)

= (3.5 x 0.2) / [(3 x 0.2) + (3.5 x 0.2)]

= 0.35

Using these values

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Answer:

Explanation:

it assigns a color for various temps, frequencies, and wave lengths. basically if you have a temprature of something you can use the electromagnetic spectrum to find the color of the object, the frequencies, and wave lengths, etc.

Answer:

3.01 × 10²³ atoms Ne

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

Identify

[Given] 10.1 g Ne

[Solve] atoms Ne

Step 2: Identify Conversions

Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

[PT] Molar Mass of Ne: 20.18 g/mol\

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

3.01398 × 10²³ atoms Ne ≈ 3.01 × 10²³ atoms Ne

Answer: B, a fusion recrion creates waste material that is easier to store than fission.

Fusion produces far less harmful waste than fission does. The reliance of something independent like whether a reaction will stop on its own when something goes wrong is never indefinite (technological failures are unpredictable and destructive a lot of the time when it comes down to nuclear power).

Answer:

1.14

Explanation:

This is a neutralization reaction between KOH and HClO4, which can be represented by the following balanced chemical equation:

KOH + HClO4 → KClO4 + H2O

Before any HClO4 is added, the 20.0-mL sample of 0.150 M KOH contains:

moles of KOH = M × V = 0.150 mol/L × 0.0200 L = 0.00300 mol

Since the balanced chemical equation has a 1:1 stoichiometric ratio between KOH and HClO4, 0.00300 moles of HClO4 will be required to completely react with the KOH.

When 27.0 mL of 0.125 M HClO4 is added, the total volume becomes:

V_total = V_initial + V_added = 20.0 mL + 27.0 mL = 47.0 mL

The moles of HClO4 added can be calculated as:

moles of HClO4 = M × V = 0.125 mol/L × 0.0270 L = 0.00338 mol

Since the reaction is 1:1, this means that 0.00338 mol of KOH has been neutralized.

The moles of KOH remaining can be calculated as:

moles of KOH remaining = 0.00300 mol - 0.00338 mol = -0.00038 mol

This negative value indicates that all of the KOH has been neutralized and there is an excess of HClO4. Therefore, we need to calculate the pH of a solution of HClO4.

The concentration of HClO4 after 27.0 mL has been added can be calculated as:

M = moles of HClO4 / V_total = 0.00338 mol / 0.0470 L = 0.0719 M

The pH of this solution can be calculated using the equation:

pH = -log[H+]

Where [H+] is the concentration of hydrogen ions in the solution.

HClO4 is a strong acid, which means that it completely dissociates in water to form H+ and ClO4- ions. Therefore, the concentration of hydrogen ions in a 0.0719 M solution of HClO4 is equal to the concentration of HClO4:

[H+] = 0.0719 M

The pH can then be calculated as:

pH = -log[H+] = -log(0.0719) = 1.14

Therefore, the pH after 27.0 mL of 0.125 M HClO4 has been added to a 20.0-mL sample of 0.150 M KOH is 1.14.

Answer:

C. Thunderstorms

Explanation:

It is formed when three components: unstable weather conditions, uprising cold air, and enough moisture are present in the area. Based on the criteria for thunderstorms to form, it is not related to the flow of thermal energy inside the Earth.

Answer:

2Li + ZnBr2 ->2LiBr + Zn

3Ca + Al2O3 ->2Al + 3CaO

Explanation:

Spontaneous reactions are reactions that can happen on their own. For a spontaneous reaction to occur, a metal that is higher in the activity series must displace a metal that is lower in the activity series from its solution and not vice versa.

If we look at the two reactions selected in the answer, lithium is above zinc in the activity series and calcium is above aluminum in the activity series hence the two reactions occur spontaneously.

According to the electronic configuration, there are 1,2,3,5 sublevels in first,second,third,fifth energy level respectively,3 f sublevel does not exist as it has only 3 energy levels.

Electrons present in an atom revolve in different orbits which are stationary states and are also called as energy levels. The energy levels are numbered as integers which are also called as principal quantum numbers.

Energy of the stationary state is given as E= -R

1/n² where R

is the Rydberg's constant. When an electron is excited, and it moves from lower to higher energy levels there is absorption of energy, while when it moves from higher energy level to lower energy level it radiates or gives out energy in the form of radiation.

They can also be defined as the distances between electron and nucleus of an atom . Electrons present in K energy level have least energy .Energy level diagrams are studied to understand nature of bonding , placement of electrons in orbits and and elemental behavior under certain conditions.

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The frequency of a helium-neon laser light with a wavelength of 632.8 nm can be calculated using the formula: frequency = speed of light / wavelength

The speed of light is a constant value of approximately 3.00 x 10^8 meters per second.
Converting the wavelength from nanometers to meters:
632.8 nm = 632.8 x 10^(-9) meters
Now we can calculate the frequency:
frequency = (3.00 x 10^8 meters per second) / (632.8 x 10^(-9) meters)
The frequency of the helium-neon laser light with a wavelength of 632.8 nm is approximately 4.74 x 10^14 Hz (hertz).

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Answer:

touch it :)

Explanation:

Answer: I Believe The answer to this question is to hover your hand over the piece of Metal, life what'd you do in a house fire to tell if the doorknob is hot.

Explanation: