Convert the following to the unit shown. show your dimensional analysis

135 mm Hg = _________ atm

Answer:

a. how much So² can be made in moles?

= 0.2 moles

b. how much So² can be made in grams?

= 12.8 grams

c. what is the Excess reactant?

= O²

Explanation:

mass of ZnS= 19.6g

mass of O²= 33.6g

i. start by determining if the equation is balanced (it is)

ii. calculate the molar mass of each reagent

- molar mass of ZnS

= (65) + (32) = 97g/mol

- molar mass of O²

= (16 x 2) = 32g/mol

iii. determine the reactants' number of moles

- no of moles of ZnS = mass of ZnS / molar mass of ZnS

= 19.6 / 97

= 0.2 mol

- no of moles of O² = mass of O² / molar mass of O²

= 33.6 / 32

= 1.05 mol

iv. determine the reactant mole ratio

0.2 moles of ZnS reacted with 1.05 moles of O²

ratio = 1.05 / 0.2 which will approximately be 5

therefore, we can say that there are x5 as many molecules of O² than ZnS

v. determine the reactant ideal ratio

from the equation, 2 moles of ZnS reacted with 3 moles of 0². therefore, the ideal ratio is 2:3, with O² having the greater ratio once again

vi. determine the limiting and excess reactant

we can say from both the mole and ideal ratio that O² is the excess reactant and ZnS is the limiting reactant (answer to the third question)

next phase,

vii. determine the ratio of limiting reactant to the product

from the equation,

2 moles of ZnS produced 2 moles of So²

therefore, mole ratio = 2:2 which is also 1:1

viii. to determine how much So² can be made in moles

= no of moles of limiting reactant x mole ratio of reactant and product

= 0.2 moles of ZnS x 1/1

= 0.2 x 1

= 0.2 moles of So² (answer to the first question)

ix. to determine how much So² can be made in grams

= no of moles of So² produced x molar mass of So²

- molar mass of So²

= 32 + (16 x 2)

= 32 + 32

= 64g/mol

therefore, how much So² produced in grams

= 0.2 x 64

= 12.8g of So² (answer to the second question)

answerer's note: I recently started learning about theoretical yield in school and so this is the result of what I know so far. You're free to make confirmations from others who are more experienced :)

Answer:

1.3 atm

Explanation:

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas:

(P1 x V1) / (T1) = (P2 x V2) / (T2)

where P1, V1, and T1 are the initial pressure, volume, and temperature of the gas, and P2, V2, and T2 are the final pressure, volume, and temperature of the gas.

We are given:

P1 is what we want to find

V1 = 839 mL

T1 = 45 degrees Celsius = 318 K

V2 = 1032 mL

T2 = 58 degrees Celsius = 331 K

P2 = 1.9 atm

Plugging these values into the formula, we get:

(P1 x 839 mL) / (318 K) = (1.9 atm x 1032 mL) / (331 K)

Simplifying and solving for P1, we get:

P1 = (1.9 atm x 1032 mL x 318 K) / (839 mL x 331 K)

P1 = 1.3 atm (rounded to one decimal place)

Therefore, the original pressure of the oxygen sample was 1.3 atm.

The arrangement that orders the n-alkanes from lowest to highest boiling point is:

C8 < C9 < C10 < C11 < C12 < C14 < C16 < C18 < C20

Order the boiling point of n-alkanes of n-alkanes from lowest to highest boiling point is: Methane < Ethane < Propane < Butane < Pentane < Hexane < Heptane < Octane < Nonane < Decane.

The boiling point of n-alkanes increases with increasing molecular weight and surface area. Therefore, the correct order of n-alkanes from lowest to highest boiling point is:

Methane < Ethane < Propane < Butane < Pentane < Hexane < Heptane < Octane < Nonane < Decane

This order is based on the assumption that all the n-alkanes are at standard conditions (1 atm and 25°C). However, it's important to note that deviations from this trend can occur due to factors such as branching, cyclic structures, and functional groups.

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Answer:

nucleus

Explanation:

An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.

hope that helps!

By halogenating an alkane, it is feasible to produce high yields of 1-chloro-2,2-dimethylpropane. Therefore, following radical halogenation of the parent alkane, only one monohalo isomer is feasible.

A double-branched chain alkane containing five carbon atoms, neopentane is also known as 2,2-dimethylpropane. Neopentane is a flammable gas at ambient pressure that, on a chilly day, in an ice bath, or when compressed to a higher pressure, can condense into a highly volatile liquid known as dimethylpropane. In organic chemistry, an alkane is an acyclic saturated hydrocarbon, sometimes known as paraffin (a historical quaint word that also has various meanings). In other terms, an alkane is made up of carbon and hydrogen atoms that are all grouped in a tree form.

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Answer:

it is a strong acid

Explanation:

on the pH scale acids range from 1 to 6

strong acids range from 1 to 3 while weak acids range from 4 to 6

Direct contact between objects causes conduction or heat transfer. The heat is transferred inside the fluid during convection. Heat transfer in radiation happens by electromagnetic waves without the use of particles.

First, ascertain whether the two things are in contact. If they are, conduction is how heat is transferred between them. Determine whether there is a fluid medium, such as a liquid or gas, connecting the items if they are not in contact.

Evidence of heat transport is apparent. Convection is the phenomenon that causes the air to shimmer over radiators. Conduction is the phenomenon that causes you to feel warm when you place your hand on a spoon that has been sitting in a hot bowl of soup (radiation).

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The atoms in the solid would be oscillating in position, according to what is known about the behavior of the atoms in each container.

Option C is correct answer.

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10.6 atm is the pressure of 2 moles of carbon dioxide at 70 degrees Celsius contained in a 4000 mL container.

The physical force applied to an object is referred to as pressure. Per unit area, a perpendicular force is delivered over the surface of the objects. F/A (Force every unit area) is the fundamental formula for pressure. Pressure is measured in Pascals (Pa).

Absolute, atmospheric, differential, as well as gauge pressures are different types of pressure. 'Pressure' is the term used to describe the thrust (force) applied to a surface every unit area. The proportion of the force can the surface area (more than where the pressure is acting) is another way to describe it.

P×V = n×R×T    

P× 4000 = 2×0.821×330

P = 10.6 atm

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The correct exponential notation for Planck's constant is\(6.63\times10^{-34} Js\).

Explanation:

Given that,

Planck constant =\(6.626070\times10^{-34} Js\)

We need to find the correct exponential notation for Planck's constant

According to the given options,

In option (a) :

The given value in option is \(h= 6.62\times10^{34} J.s\)

In this option, the given value is in three significant figures but the negative sign is missing in the exponential term.

So, this is the incorrect option.

In option (b) :

The given value in question is \(6.626070\times10^{-34} Js\)

We write the value of the Planck constant with three significant figures.

The Planck constant with three significant figures will be

\(h=6.63\times10^{-34} Js\)

So, this is the correct option.

In option (c) :

The given value is \(h= 6.02\times10^{34} J.s\)

In this option, the given value is in three significant figures but this value is not the Planck constant value.

So, this is the incorrect option.

Hence, the correct exponential notation for Planck's constant is\(6.63\times10^{-34} Js\).

The correct option is (b).

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The rate law for the reaction 2A + 3B → products is rate = k[A]^1[B]², which can be simplified to rate = k[A][B]²(D).

The rate law for a chemical reaction describes how the rate of the reaction depends on the concentrations of the reactants. In this case, the rate law is first order in A, meaning that the rate of the reaction is directly proportional to the concentration of A.

The rate law is also second order in B, meaning that the rate of the reaction is proportional to the square of the concentration of B. Combining these two dependencies, we get the rate law rate = k[A]^1[B]^2, which can be simplified to rate = k[A][B]^2. Therefore, the correct answer is option D, k[A][B]^2.

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The relative atomic mass of an element is compared with the mass of an atom of carbon-12.

Carbon-12 is chosen as the reference because it has a mass of exactly 12 atomic mass units (amu). The relative atomic mass, also known as atomic weight, provides a standard for comparing the masses of different elements.

It is calculated based on the weighted average of the masses of an element's naturally occurring isotopes, taking into account their abundance. By using carbon-12 as the reference, scientists establish a consistent scale for expressing atomic masses.

This standardization is essential for accurately conveying the mass of atoms in a way that is universally understandable and comparable across various elements and compounds.

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Acetic acid and isopropyl alcohol are fully soluble in water

The form of acetic acid and isopropyl alcohol are: The acidic hydrogens are appeared by the arrow in the two systems. As we can see, the O-H bond is attending in both these compounds. Since the O-H bond is highly polar, these compounds are also highly set off, and hence, they are soluble in water.

Acetic acid, however, is quite soluble. This is easy to describe using the small alcohol vs large alcohol argument: hydrogen bonding alcohols are usually more soluble in water than alcohols of the same molecular mass.

So we can conclude that Isopropyl alcohol is soluble in water because it can form strong hydrogen bonds with the water.

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Answer:

Given the balanced equation

CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g)

we know that we'll get one mole CO2 for every 1 mole CH4.  So let's calculate how many moles are in 50 g of CH4 by dividing it's mass by it's molar mass (16 g/mole).  I get 3.125 moles.  The equation says we should get the same number of moles of CO2, so set moles CO2 = 3.125 moles.  Then we can find the mass of CO2 by multipying by the molar mass of CO2 (44 g/mole).  We should expect 138 grams of CO2.

Explanation:

Answer:

We know that we'll get one mole CO2 for every 1 mole CH4.  So let's calculate how many moles are in 50 g of CH4 by dividing it's mass by it's molar mass (16 g/mole).  I get 3.125 moles.  The equation says we should get the same number of moles of CO2, so set moles CO2 = 3.125 moles.  Then we can find the mass of CO2 by multipying by the molar mass of CO2 (44 g/mole).  We should expect 138 grams of CO2.

Answer:

D

Explanation:

The answer should be that the solution is unsaturated

The high-density brine drains into the water beneath the ice and in the process, the sea ice freshens while the salinity of the underlying water decreases, becoming less dense (Option C).

Sea ice is usually less salty than the ocean water it freezes from. During the process of ice formation, salt in the ocean water is expelled from the ice as it grows; most of the salt is ejected into the ocean but some remain trapped inside pockets of brine within the ice. When the air temperature falls below the freezing point of seawater (usually around -1.8 °C), water molecules start to form ice crystals, which grow and aggregate into a solid sheet of ice.

During this process, the salt rejected by the growing ice also accumulates, causing the salinity of the remaining brine to increase. Some of the brine is encapsulated within ice crystals, but most are trapped in the spaces between neighboring crystals.

Thus, the correct option is C.

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The distance that will be traveled by me on the US interstate system will be 403.3 km.

Distance is the total length between two points. Distance is the total movement of an object without any regard to direction. We can define distance as to how much ground an object has covered despite its starting or ending point.

To calculate the distance traveled;

d = Vt

Where;

d = Distance traveled by me

V = Maximum speed

t = Time

Given:

V = 121 km/h

t = 3 hours 20 minute = 10/3 hours

Substituting the values in the formula

d = 121×10/3

d = 403.3 km

In conclusion, the distance traveled by me will be 403.3 km.

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Answer:

D

Explanation:

Of the four given equations, we want to determine which will most likely have a positive ΔS.

A positive ΔS indicates an increase in entropy. Recall that entropy can be described as the "randomness" of a substance. Therefore, gases have the highest entropy, followed by liquids and solids.

Examining each answer choice:

The E2 reaction proceeds with anti-periplanar stereochemistry, resulting in the formation of diastereomeric alkenes for alkyl halides (a) and (b). The products will have different configurations of alkene substituents, which should be drawn as regular lines.

An E2 reaction proceeds with anti-periplanar stereochemistry, meaning the leaving group and the hydrogen being eliminated must be on opposite sides of the molecule. To draw the products of each elimination for diastereomeric alkyl halides (a) and (b), follow these steps:
Step:1. Identify the leaving group (usually a halogen) and the hydrogen that will be eliminated (usually bonded to the adjacent carbon).
Step:2. Ensure that these groups are anti-periplanar (opposite sides) in the starting molecule.
Step:3. Remove the leaving group and the hydrogen, and form a double bond between the carbon atoms that were bonded to these groups.
Step:4. Draw the resulting alkene with substituents as regular lines, not dashes or wedges, as mentioned in your question.
Since the alkyl halides in (a) and (b) are diastereomers, their products will also be diastereomeric alkenes. Diastereomers are stereoisomers that are not mirror images of each other. This means that the products of these two reactions will have different configurations of their substituents around the double bond, but will not be mirror images.

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Answer:  50 nm

Explanation:  Two steps:

1.  Divide 3.25/6.5 = 0.5

2.  Divide 10^8/10^6 = 10^2

nm^2/nm = nm

Combine:  0.5x10^2 nm

or 50 nm

The snack containing 10 g of carbohydrates, 2 g of protein, and 5 g of fat has a total of 93 calories.

To calculate the total number of calories in the snack, we need to consider the caloric content of each macronutrient (carbohydrates, proteins, and fats).

Carbohydrates: Carbohydrates provide 4 calories per gram. In this case, 10 g of carbohydrates would contribute 10 g * 4 calories/g = 40 calories.

Proteins: Proteins also provide 4 calories per gram. With 2 g of protein, we have 2 g * 4 calories/g = 8 calories.

Fats: Fats provide 9 calories per gram. For the 5 g of fat in the snack, we have 5 g * 9 calories/g = 45 calories.

Now, to find the total calories, we add up the calories from each macronutrient: 40 calories (carbohydrates) + 8 calories (protein) + 45 calories (fat) = 93 calories.

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Answer:

Sound travels more quickly through solids than through liquids and gases because the molecules of a solid are closer together and, therefore, can transmit the vibrations (energy) faster.

Answer: Solid molecules are packed together.

Explanation:

I answered the question and got it right.

Answer: I can suck you di ck

Explanation:

Answer:

carbon dioxide gas

Explanation:

carbon dioxide gas is an element which forms and oxide that is a reactant in photosynthesis.

Answer:

Carbon dioxide

Explanation:

Cubic boron nitride has the highest hardness.

Here's a brief overview of each abrasive material:
1. Aluminum oxide: This is a common abrasive material used in grinding wheels and sandpapers. It has a high hardness, but it is less hard than silicon carbide and cubic boron nitride.
2. Cubic boron nitride: This is a synthetic material that is very hard and durable. It has the highest hardness among the listed abrasive materials and is often used for cutting and grinding high-speed steels and other hard materials.
3. Silicon carbide: This is another synthetic abrasive material with a high hardness level, but it is still less hard than cubic boron nitride. It is commonly used for grinding and cutting non-metallic materials like glass, ceramics, and stone.

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The amino acid threonine has a carboxyl group (-COOH), an amino group (-NH2), and a hydroxyl group (-OH) attached to the alpha carbon. At pH 11.0, the amino group is protonated (-NH3+) while the carboxyl group is deprotonated (-COO-). The hydroxyl group (-OH) is also deprotonated to form an alkoxide (-O-).

The resulting major ionic form of threonine is:

NH3+CH(CH3)CH(O-)COO-

The structural formula of this ionic form is as follows:

         H

         |

H3N+ - C - C - OH

|

CH3

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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.