Rank the following in order of decreasing the rate of effusion. F2 SF6 He Ar a. He > F2 > SF6 > Ar b. He > F2 > Ar > SF6 c. Ar > He > SF6 > F2 d. SF6 > Ar > F2 > He e. OF2 > Ar> He > SF6

Answer:

39.2 g

Explanation:

because moles = mass / mr (mr of h is 1)

so 39.2/1= 39.2 moles

hope this helps you to understand :)

Answer:

Argon

Explanation:

Argon is the gas that is used most often by window manufacturers to displace the air between the panels in windows. Argon is non-toxic, inert, clear, and odorless. Its thermal conductivity is roughly 67% that of air and it’s inexpensive, making it an attractive gas fill

please mark me as brainliest

Answer:

0.1169g .

Explanation:

1. Multiply the concentration (0.5 mols/Liters) by the volume of solution you want (0.5 Liters) to find the moles of NaCl you need. 2. Multiply the moles of NaCl by its molar mass (58.44 g/mol) to find the grams of solute needed.

The question requires us to comment on the bonds that are formed when occurs the combustion of octane.

The combustion reaction of octane (C8H18) happens when this compound reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O), according to the following chemical equation:

When this reaction happens, the covalent bonds between carbon (C) and hydrogen (H) in the octane molecule are broken and new bonds between cabon and oxygen atoms are formed to produce CO2. Similarly, hydrogens atoms "released" bond to oxygen atom to form H2O.

Therefore, the bonds C=O and H-O- are formed when octane is burned.

decay rate of approximately 1.69x10^17 Bq (becquerels),

The decay rate of a radioactive sample is determined by the number  of radioactive atoms present and the decay constant, which represents the probability of decay per unit of time.

To calculate the decay rate, we multiply the number of atoms in the sample by the decay constant. In this case, the sample has 8.31x10^17 atoms and a decay constant of 0.203/s. Multiplying these values gives a decay rate of approximately 1.69x10^17 Bq (becquerels), which represents the number of decays per second in the sample.

Learn more about Oxygen here : brainly.com/question/13905823

#SPJ11

Answer:

We don't know what solvent X and solvent Y are, but from the chart, we can see that in solvent X, hydrochloric acid can conduct electricity (bulb lights up), and react with calcium carbonate.

So, we can say the electrical conductivity when HCl is dissolved in solvent X is high, and when HCl is dissolved in solvent Y, the electrical conductivity is low (because light bulb doesn't light up).

Additionally, in solvent X, HCl ionizes, this shows the property of acids: reacts with carbonates to give CO2 (because CO2 reacts with lime water to make it cloudy).

In solvent Y, HCl does not ionize, so there is no reaction between acid and calcium carbonate.

Answer:

wrapping the coil around a piece of iron (such as an iron nail)

adding more turns to the coil.

increasing the current flowing through the coil.

I forget the last one

Explanation:

Tighten the wire coils. The more times the wire coils in a given length of solenoid, the stronger the electromagnetic field will be. For instance, if your copper wire is coiled 100 times around a 2-inch iron nail, try to push the coils closer together and wrap the wire a few more times around the nail.

Explanation:

Answer:

1.28 mol

Explanation:

1.28 moles of steam are produced.

Ideal gas equation:-

\(PV=nRT\)....(1)

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

Given values:-

P=2 atm

T=202.0°C=475.15 K

V=12.50 L

R=0.08231 Latm\Kmol

Substitute all the values in the equation (1) as follows:-

\(2\ atm\times12.50\ L=n\times0.0821\ \frac{Latm}{Kmol} \times475.15\ K\\\\\frac{2\ atm\times12.50\ L}{0.0821\ \frac{Latm}{Kmol} \times475.15\ K}=n\\\\0.64\ mol=n\)

The reaction for the combustion of methane is as follows:-

\(CH_4+2O_2\rightarrow CO_2+2H_2O\)

From the above reaction:-

1 mole of \(CH_4\) produces 2 moles of steam

0.64 mole of \(CH_4\) produces \(0.64\times2=1.28\ moles\)

Hence, 1.28 moles of steam are produced.

To know more about:-

brainly.com/question/23967621

The wavelength of light emitted during this transition is approximately 6.56 × 10^-7 meters, or 656 nm.

The wavelength of light emitted during a transition in a hydrogen atom when the electrons jump from one energy level to another can be determined using the Rydberg formula. The Rydberg formula is given by:

1/λ = R * (1/n1^2 - 1/n2^2)

Where λ is the wavelength of light emitted, R is the Rydberg constant, and n1 and n2 are the initial and final energy levels, respectively.

The Rydberg constant (R) is equal to 1.097 × 10^7 m^-1.

To find the wavelength, we need to know the initial and final energy levels. The energy levels in the hydrogen atom are represented by integers called quantum numbers. The lowest energy level is n = 1, followed by n = 2, n = 3, and so on.

For example, if the electron transitions from n1 = 3 to n2 = 2, we can substitute these values into the Rydberg formula:

1/λ = 1.097 × 10^7 * (1/2^2 - 1/3^2)

Simplifying the equation:

1/λ = 1.097 × 10^7 * (1/4 - 1/9)

1/λ = 1.097 × 10^7 * (5/36)

Solving for λ:

λ = 36 / (1.097 × 10^7 * 5/36)

λ ≈ 6.56 × 10^-7 m

Learn more about wavelength here :-

https://brainly.com/question/31143857

#SPJ11

Taking into account the reaction stoichiometry, 17.61 moles of O₂ is required to react with 155 grams of C₃H₈.

In first place, the balanced reaction is:

C₃H₈ + 5 O₂  → 3 CO₂ + 4 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 44 grams of C₃H₈ react with 5 moles of O₂, 155 grams of C₃H₈ react with how many moles of O₂?

\(moles of O_{2} =\frac{155 grams of C_{3} H_{8}x5 moles of O_{2} }{44 grams of C_{3} H_{8}}\)

moles of O₂= 17.61 moles

Finally, 17.61 moles of O₂ is required to react with 155 grams of C₃H₈.

Learn more about the reaction stoichiometry:

brainly.com/question/24741074

brainly.com/question/24653699

Answer:

The sun is it's darkened phase

Answer:

Only chemical equation uses arrow instead of = sign

Answer:

Only chemical equation uses an arrow instead of a = sign.

A chemical equation depicts a chemical reaction by utilising chemical formulae and symbols to depict the reactants, products, and chemical changes that take place. In a chemical equation, the arrow indicates the direction of the reaction and is commonly depicted as a single arrow pointing from the reactants to the products. In contrast, the equals sign (=) is commonly used in mathematical equations to indicate that two expressions have the same value.

While numbers are used to indicate the relative proportions of reactants and products and minus signs are used to indicate reactants or products in the form of ions, the arrow is the most distinguishing feature that distinguishes chemical equations from mathematical equations.

Manufacturers make vegetable oils solid or semisolid at room temperature through a process called hydrogenation. Hydrogenation involves the addition of hydrogen gas to unsaturated vegetable oils, resulting in the conversion of some of the unsaturated fats into saturated fats.

This process increases the melting point of the oil and transforms it into a solid or semisolid form.

During hydrogenation, vegetable oils are heated and mixed with a catalyst, typically a metal catalyst like nickel, in the presence of hydrogen gas. The unsaturated fats in the oil undergo a chemical reaction called hydrogenation, where the carbon-carbon double bonds in the fatty acid molecules are converted into single bonds. This saturation process reduces the overall degree of unsaturation in the oil and increases its stability and solidification properties.

The hydrogenated vegetable oils, commonly known as trans fats, have a higher melting point and are solid or semisolid at room temperature. This property makes them suitable for various food applications, such as margarine, shortening, and bakery products, where a solid or semisolid texture is desired. However, it is worth noting that the consumption of trans fats has been linked to adverse health effects, and many manufacturers are now moving towards healthier alternatives and reducing the use of hydrogenated oils in their products.

To learn more about solidification properties visit: brainly.com/question/31966477

#SPJ11

Manufacturers make vegetable oils solid or semisolid at room temperature through a process called hydrogenation.

Hydrogenation involves adding hydrogen gas to vegetable oils in the presence of a catalyst, typically nickel or palladium. This process causes the unsaturated fats in the oils to undergo a chemical reaction, converting them into saturated fats.

Saturated fats have a higher melting point and are solid or semisolid at room temperature, unlike the liquid form of unsaturated fats. By hydrogenating vegetable oils, manufacturers can increase their stability, improve texture, and extend shelf life. This transformation allows vegetable oils to be used as margarine, shortening, or in the production of solid or semisolid food products like baked goods and spreads.

Therefore, it is important to note that hydrogenation can result in the formation of trans fats, which have been associated with negative health effects. To address this concern, many manufacturers are transitioning to alternative methods or using healthier oils in their products.

To learn more about hydrogenation from the given link

https://brainly.com/question/12833896

#SPJ4

Answer:

Explanation:

Rust used to be a very common reaction. Iron was used in autos and they formed oxides of iron or rust as the auto or truck aged. You can still see this in older vehicles, especially those used in the country.

To make wine from grapes, the grapes need to ferment which is a process where the grape just changes to alcohol or sometimes vinegar, depending on how the grapes ferment. You can certainly tell the difference between grape juice, wine an vinegar when you taste them. A chemical reaction has taken place.

There are three different totals:

1) 4: This total refers to molecules with a tetrahedral geometry, which have four electron domains (two lone pairs and two bonds).

2) 3: This total refers to molecules with a trigonal planar geometry, which have three electron domains (one lone pair and two bonds).

3) 2: This total refers to molecules with a linear geometry, which have two electron domains (one lone pair and one bond).

Generally, An electron domain is a region of space around a particular atom where electrons are likely to be found. It consists of the orbitals that are closest to the nucleus of the atom.

Read more about the electron domain

https://brainly.com/question/20444941

#SPJ1

Dissolving and dispersing are two different approaches to waste disposal. Dissolving is the method of separating and breaking down solid waste materials into smaller particles by using a solvent such as water.

Dispersing involves distributing and breaking up the waste into smaller pieces in order to make it more manageable to dispose of.

Dissolving means breaking them down; dispersing means spreading them out is the right choice.In conclusion, dissolving and dispersing waste materials have different methods. Dissolving refers to the separation and breaking down of solid waste materials into smaller particles by utilizing a solvent such as water.

Dispersing, on the other hand, involves distributing and breaking up waste into smaller pieces to make it more manageable to dispose of.

To know more about waste disposal visit:

https://brainly.com/question/30944259

#SPJ11

Answer:

amount of gas and pressure

If the plate you selected had only been inoculated with 0.1 ml of the dilution, it would have less bacterial colonies and would affect your experiment's results.Inoculation is the process of introducing a sample of bacteria into a culture medium to propagate it.

It entails the injection of bacterial cultures into the experimental environment to monitor their growth and conduct research on them.What happens when a plate is inoculated with a smaller amount of bacteria?A lower bacterial count may occur on the plate if a smaller amount of bacteria is inoculated. When this occurs, the experiment's results may be affected. If the initial number of bacteria is smaller, the number of colonies on the agar plate may be lower. It's critical to get the proper inoculum concentration on the agar plate to obtain accurate results.

How to prevent the plate from being inoculated with a small amount of bacteria?To ensure that the bacteria are properly inoculated, a standard operating procedure must be established. For example, before inoculating the bacteria into the media, the culture should be mixed well and diluted properly. Then, you can obtain a good quantity of bacteria in the inoculum loop, dip it into the broth culture, and streak it onto the agar plate.  As a result, you will be able to obtain an optimal inoculum size. This ensures that the bacteria are evenly distributed over the plate and that they have sufficient room to grow.

To know more about bacterial colonies  visit:

https://brainly.com/question/29869987

#SPJ11

The pH of the 0.35 M solution of sodium formate is approximately 3.74.

To determine the pH of a solution of sodium formate (HCOONa), we need to consider the hydrolysis of the sodium formate salt in water. Sodium formate can be considered the conjugate base of formic acid (HCOOH). In water, sodium formate will hydrolyze, resulting in the formation of formic acid and hydroxide ions. The equilibrium equation for this hydrolysis reaction is:

HCOONa + H₂O ⇌ HCOOH + NaOH

Since we're given a 0.35 M solution of sodium formate, we can assume that it fully dissociates into sodium ions (Na+) and formate ions (HCOO-). Therefore, the concentration of formate ions in the solution is also 0.35 M.

Next, we can use the equilibrium constant expression for the hydrolysis reaction to find the concentration of hydroxide ions (OH-) produced:

Ka = [HCOOH][OH-] / [HCOONa]

The concentration of formic acid ([HCOOH]) can be assumed to be negligible compared to the concentration of sodium formate ([HCOONa]), so we can approximate the equation as:

Ka = [OH-] * [HCOO-] / [HCOONa]

Given that the Ka value for formic acid is 1.8 × 10^-4, we can rearrange the equation and solve for [OH-]:

[OH-] = (Ka * [HCOONa]) / [HCOO-]

     = (1.8 × 10^-4) * (0.35 M) / (0.35 M)

     = 1.8 × 10^-4 M

Since the concentration of hydroxide ions ([OH-]) is equal to the concentration of hydronium ions ([H+]) in a neutral solution, we can determine the pH using the equation:

pH = -log10([H+])

Therefore, the pH of the solution is:

pH = -log10(1.8 × 10^-4)

  ≈ 3.74

Learn more about pH at https://brainly.com/question/172153

#SPJ11

Answer:

yes they carry charges

The metal that does not act as a sacrificial electrode for iron is C. Mn (Manganese).

Both trials of 1.2 g and 1.6 g will have the same mass percent of water because the ratio of the salt to the water of hydration is always constant for any hydrated salt.

For every hydrated salt, the ratio of the salt to the water of hydration remains constant irrespective of the amount of salt taken for experimental analysis.

For example, assuming the mass percent of water in 10g of a hydrated salt is 40%, if 100g of the same salt is taken, the mass percent will remain 40%.

More on water of hydration can be found here: https://brainly.com/question/11202174

Explanation:

There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. The correct option is option C.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds.

Ionic bonds are formed by elements whose electronegativity difference is very large. Since K has high electronegativity among all given elements so K is most likely to react with Br.

Therefore, the correct option is option C.

To learn more about chemical compound, here:

https://brainly.com/question/26487468

#SPJ2

Answer:

32.7%

Explanation:

To calculate the percentage by mass of an element in a compound, the following procedure is employed:

- Find the atomic mass of the element

- Find the molar mass of the compound

- Divide the atomic mass of the element by the molar mass of the compound and multiply by 100

Mathematically; this is denoted by:

Mass % of Sulphur = (Atomic mass of S/Molar mass of H2SO4) × 100

Atomic mass of S = 32g/lol

Molar mass of H2SO4 = 1(2) + 32 + 16(4) = 2 + 32 + 64

= 98g/mol

Hence,

% mass of S = 32/98 × 100

= 0.3265 × 100

= 32.65

= 32.7 (1 d.p)

Therefore, the percent of sulfur in sulfuric acid (H2SO4) is 32.7%

Answer:

the boiling point increases and the freezing point decreases.

If excess solvent is added, discard the entire solution and begin the process of preparing the solution afresh.

It is common to prepare solutions using a standard volumetric flask. In this method, the required amount of solid or liquid is added to the volumetric flask and made up to mark with solvent.

Sometimes, it is possible to mistakenly exceed the mark as the solvent is added. In such cases, you must discard the entire solution and begin the process of preparing the solution afresh.

Learn more: https://brainly.com/question/8646601

Knowing the percent iron in a mixture is essential for building a bridge because it directly affects the structural integrity, strength, and durability of the bridge.

Iron is a critical component in steel, which is commonly used in bridge construction. The percent iron in a mixture determines the strength and other mechanical properties of the steel. By knowing the percentage of iron, engineers can ensure that the steel used in the bridge meets the required standards for strength and durability. This knowledge helps in preventing potential structural failures and ensuring the safety of those using the bridge.

In summary, determining the percent iron in a mixture is crucial for building a safe and reliable bridge, as it plays a significant role in the bridge's structural integrity, strength, and durability.

To know more about bridge construction, click here

https://brainly.com/question/20517830

#SPJ11