For the conversion of methyl isonitrile to acetonitrile in the gas phase at 250 °C
CH3NCCH3CN
the following data have been obtained:
[CH3NC], M 2.78×10-2 1.66×10-2 9.96×10-3 5.97×10-3
time, s 0 171 342 513
The average rate of disappearance of CH3NC over the time period from t = 342 s to t = 513 s is__________ M s-1.

: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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4.20325g of oxygen was used.

The reaction described is represented chemically by the equation 4NH3 + 5O2 = 4NO + 6H2O.

Ammonia produced by industry is used as fertilizer in agriculture to the tune of 80%. In addition to these uses, ammonia is made into polymers, explosives, textiles, insecticides, dyes, and other chemicals. It is also used to purify water sources.

As a result, 4 moles of NH3 and 5 moles of O2 react.

The molar mass of 1 mole of oxygen is 2 * 16 = 32g.

5 moles of oxygen are equal to 5 * 32, or 160g.

68g is equal to 4 (14 + 3*1) moles of NH3.

68g of NH3 reacts with 160g of O2 as a result.

However, we only have 9.89 g of oxygen.

68g and 160g interact.

9.89 and Xg react to form 4.20325g (Xg = 68*9.89/160).

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Answer:

When the number of particles, though in this case I think you mean (electrons), changes in an atom....it become an ion. Ions are atoms that were chnaged by losing or gaining an electron. If an atom gains an electron  it will have a negative charge. If an atom loses an electron it will have a positive charge. Hope this was helpful!!

Explanation:

Answer:

Definition: a statement based on something one has seen, heard, or noticed

Explanation:

In my own words it would be something you would have seen or heard.

For example you add salt to a glass of water and stirred it. An observation would be that you watched the salt dissolve in the water.

Answer:

Should be Solute

Explanation:

I looked it up ;)

Answer:

c. Solute

Explanation:

Two atoms always represent the same element if they have the same number of protons because the amount of protons an atom has determines the element it represents.

Carbon dioxide is created by burning a 6.0 g sample of carbon. The reaction only produces a 60% yield. Actual carbon dioxide production was 13.2g.

C + O2 = CO2

Moles of C in 6.0g = 6.0/12 =  0.5 moles

as 1 moles of C gives 1 mole of CO₂

Thus 0.5 moles of C will give 0.5 moles of CO₂

As, CO₂ produce is 60%

Thus, moles of CO₂ produced=(0.5x60)/100 = 0.3 moles of CO₂

Amount of CO2 produced=  Moles x Molecular mass

= 0.3 × 44

= 13.2g

Thus, 13.2g of CO₂ will be produced.

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1. Ammonia is a colorless gas with a chemical formula of NH3, when it comes in contact with water, it will be transformed into Ammonium ion and it will produce one hydroxide ion, and this is why Ammonia will present a more basic (pH) behavior, the reaction that represents this behavior is:

NH3 + H2O -> NH4+ + OH-

Number 4 is the only one that represents it well

Number 3 has the same reaction but since there is a plus sign instead of an arrow, I consider it wrong.

The reaction between chromate ester and water is a part of a huge and consecutive reaction called Jones reaction.

In this reaction, alcohol is converted to chromic acid in presence of jones reagent, chromic acid is further converted to chromate ester.

Now the obtained chromate ester has one or more unstable alpha hydrogens and in presence of basic species like water it yields an aldehyde or ketone as the organic product.

                                  O                                    O

                                   ll                                     ll

R--R'CH--OH + H-O--Cr--OH  ---->  R-R'CH-O-Cr--OH  +H₂O

                                  ll                                      ll

                                 O                                     O

Alcohol                Chromic acid               chromate ester

Further, let us understand the reaction of chromate ester with water with an example:

                    O                                                  O

                     ll                                                  ll

(CH₃)CHO---Cr---OH  + H₂O ---->(CH₃)CO + Cr--OH   +H₃O⁺

                    ll                                                  ll

                   O                                                  O

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Answer:

D) 14 Electrons

Explanation:

I took the test and got it right

The total number of electrons that can occupy the f sublevel is 14 electrons. Thus option D is correct.

Electrons can be defined as a negatively charged subatomic particle that together with protons and neutrons forms an atom's nucleus. It is the lightest subatomic particles.

s orbital has 2 electrons in pair

p orbital has 6 electrons in pair

d orbital has 10 electrons in pair

f orbital has 14 electrons in pair.

Thus, the total number of electrons that can occupy the f sublevel is 14 electrons. Thus option D is correct.

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Option (b) is correct. Functional group describes a special combinations of atoms that attach to hydrocarbon chains and rings to form organic nutrients.

Functional groups are classified as any of numerous combinations of atoms that form parts of chemical molecules that undergo characteristic reactions themselves. In many cases it influence the reactivity of the remainder of each molecule. The concept of functional groups is useful as a basis for classification of large numbers of compounds according to their reactions. Some examples of the common functional groups are hydroxyl present in alcohols and phenols, carboxyl present in carboxylic acids, carbonyl present in aldehydes, ketones and quinones. In a simple way it is defined as an atom or group of atoms within a molecule that has similar chemical properties whenever it appears in various compounds even if other parts of the molecule are quite different.

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The complete question is,

which of the following best describes a functional group?

multiple choice question.

(a) large molecules comprised of a glycerol and three fatty acid chains

(b) special combinations of atoms that attach to hydrocarbon chains and rings to form organic nutrients

(c) molecules that are composed of hydrogen and carbon in a long chain or ring-like structure

(d) large molecules composed of two or more repeating smaller units

Answer:

They can be found along the Atlantic coast of the United States.

They experience all four seasons.

Explanation:

The characteristic of temperate broadleaf forests are they can be found along the Atlantic coast of the United States and experience all four seasons.

As the name suggested that temperate broadleaf forests are those forests in which temperature througout the year is moderate and leaf of the tress are broad in shape.

Hence they can be found along the Atlantic coast of the United States and experience all four seasons are the characteristics of this forest.

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Answer:

14 grams of calcium oxide would be produced by thermal decomposition of 25 grams of calcium carbonate.

Explanation:

You know:

CaCO₃ → CaO + CO₂

In the first place, by stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) the following quantities react and are produced:

Being:

the molar mass of the compounds participating in the reaction is:

Then, by stoichiometry of the reaction, the following mass amounts of the compounds participating in the reaction react and are produced:

You can then apply the following rule of three: if by stoichiometry of the reaction 100 grams of calcium carbonate CaCO₃ produce 56 grams of calcium oxide CaO, 25 grams of CaCO₃ how much mass of CaO will it produce?

\(mass of calcium oxide=\frac{25 grams of CaCO_{3} *56 grams of CaO}{100 grams of CaCO_{3} }\)

mass of calcium oxide= 14 grams

14 grams of calcium oxide would be produced by thermal decomposition of 25 grams of calcium carbonate.

Answer:

Li

Explanation:

F is a strongest electronegative element and it will combine with an element with low electronegativity. From the list provided, the element is Li.

Answer:

It should be 1. 1.2 X 10^24

Explanation:

The mass of 8.12 x 10²³ molecules of CO₂ is D. 59.39 grams.

The mass of 8.12 x 10²³ molecules of CO₂ gas can be calculated using Avogadro's number and the molecular weight of CO₂. The molecular weight of CO₂ is the sum of the atomic masses of one carbon atom and two oxygen atoms: 12.011 u + (2 x 15.999 u) = 44.009 u.

To find the number of moles, divide the given number of molecules (8.12 x 10²³) by Avogadro's number (6.022 x 10²³ molecules/mol): (8.12 x 10²³ molecules) / (6.022 x 10²³ molecules/mol) ≈ 1.35 mol.

Now, multiply the number of moles by the molecular weight of CO₂: 1.35 mol x 44.009 g/mol ≈ 59.4 g. Therefore, the mass of 8.12 x 10²³ molecules of CO₂ gas is approximately 59.4 g, which corresponds to option D (59.39 g).

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Valence bond theory stating that a bond between two atoms is the strongest when the nuclei of the atoms are touching each other is true.

This theory states that when two valence orbitals of two different atoms overlap on each other, the bond is usually strong.

The bond formed in this scenario is usually covalent which involves sharing of the valence electrons.

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Answer:

Number of Protons: 28

Explanation:

Brainliest Appriciatedddddd

Answer:

3.02x10²⁴

Explanation:

To solve this problem we need to use Avogadro's number: It is the number of units (usually atoms or molecules, in this case it's trucks) contained in one mol: 6.023x10²³.

We multiply the given number of moles times Avogadro's number:

5 * 6.023x10²³ = 3.02x10²⁴

So five moles of trucks would be 3.02x10²⁴ trucks.

Answer:

People show more interest in personal broadcasting.

Explanation:

The art of oration (speaking) is being  replaced by personal broadcasting mean now people used webcam or camcorder for creating its own content and transmit it to other people through internet. Personal broadcasting provides audio and video to the individual that make it more interesting as compared to oration. People show more interest in personal broadcasting as compared to oration so that's why oration is replaced by personal broadcasting.

The soft drink which was not invented by a pharmacist is Coca-Cola. Coca-Cola was invented by a former Confederate colonel, John Pemberton, who was also a pharmacist, but he did not invent the beverage as a pharmacist;

He did it on his own. Pemberton was originally from Georgia and served in the Confederate Army during the American Civil War as a cavalry officer.

Pemberton was wounded and became addicted to morphine as a result of his service in the war. He was compelled to create a substitute for the morphine addiction after the war, and this led him to develop Coca-Cola, which he initially called "Pemberton's French Wine Coca."

Asa Griggs Candler acquired Coca-Cola from Pemberton's estate and turned it into a profitable company, making him one of the wealthiest businessmen of his day.

Many popular soft drinks were actually invented by pharmacists, but one notable exception is "7 Up." 7 Up is a lemon-lime flavored carbonated beverage that was created by Charles Leiper Grigg in 1929. Unlike many other soft drinks, Grigg was not a pharmacist but a businessman and chemist.

He developed the formula for 7 Up, originally called "Bib-Label Lithiated Lemon-Lime Soda," as a mood-enhancing drink during the Great Depression. The name was later changed to 7 Up to reflect the soda's seven main ingredients. So, while several soft drinks have a pharmaceutical origin, 7 Up stands out as an exception in that regard.

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Answer:

It would be Container 3

Explanation:

Each of the containers has the same amount of salt.  Salinity refers to salt level.  Since the question is asking for the container with the greatest salinity, you are looking for the container with the least water (because it will be the saltiest out of all of them).  Container 3 has the least water.

Hope this helps :)

3 has less water so its saltier

Answer:

21st century

Explanation:

Answer:

Explanation:

Milk and starch solution are example of colloidal solution and we know that Tyndall effect is shown by colloids.

Answer:

answer is A. Hypothesis on edge 2020

Explanation:

have a great day peeps :)

Trimethylamine ionizes as follows in water. 2.6 × 10⁻³  M is  concentration of trimethylammonium ion. option d is correct.

To determine the concentration of trimethylammonium ion, (CH₃)3NH⁺, in a 9.0 × 10⁻² M solution of (CH₃)3N, we can use the ionization equilibrium expression and the given Kb value (7.4 × 10⁻⁵).
The ionization reaction is:
(CH₃)3N + H₂O ↔ (CH₃)3NH⁺ + OH⁻
Let x be the concentration of (CH₃)3NH⁺ and OH- formed in the equilibrium. Initially, the concentration of (CH₃)3N is 9.0 × 10⁻² M, and the concentrations of (CH₃)3NH⁺ and OH- are both 0. At equilibrium, the concentration of (CH₃)3N will be (9.0 × 10⁻² - x) M.
Now, we can write the equilibrium expression using the Kb value:

\(Kb=\frac{[H+][A-]}{[HA]}\)
Kb = [ (CH₃)3NH⁺ ][ OH- ] / [ (CH₃)3N ]
Substitute the values:
7.4 × 10⁻⁵ = x² / (9.0 × 10⁻² - x)
To solve for x, we can assume that x is much smaller than 9.0 × 10⁻², so the equation becomes:
7.4 × 10⁻⁵ ≈ x² / 9.0 × 10⁻²
Solve for x:
x = √(7.4 × 10⁻⁵ × 9.0 × 10⁻²) ≈ 2.6 × 10⁻³ M
Thus, the concentration of trimethylammonium ion, (CH₃)3NH⁺, in the solution is approximately 2.6 × 10⁻³  M.

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Explanation:

by doing the experiment

to test the hypothesis of the problems.

Answer:

just be yourself , if they are a good person that you want to be your friend they would support you and care about what you have to say.

Explanation: