when 1.0g of diethyl ether is converted to vapor at its boiling point, about how much heat is absorbed? (C4H10O, Hvap= 15.7kj/mol, boiling point:34.6°C)

A) 2 J
B) 2 kj
C) 0.2 J
D) 0.2 kj

(Please show how you got the answer.)​

Answer:

True

Explanation:

Soluble substances dissolve.

Therefore they wouldn't be called soluble if they can't dissolve in solvents

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Soluble substances can dissolve in certain solvents this statement is true.

Hence, the given statement is true.

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Answer: pV = nRT , or  V = \frac{nRT}{p} , with p - pressure, V - volume, n - amount of substance, T - temperature in K.

Then:  \frac{V_2}{V_1} = \frac{n_2RT_2p_1}{p_2n_1RT_1}  

n_2 = n_1 ,  p_2 = p_1  

V_2 = V_1 \cdot \frac{T_2}{T_1} = 4.24 \frac {(273.00+5.00)}{(273.00+23.00)}=3.98 l   Explanation

The new  volume is calculated using the Charles law formula

that is V1/ T1 = V2/T2  where,

V1 = 4.24 l

T1= 23c  into kelvin = 23  +273 =296 K

T2 = 5.00 c into kelvin = 5.00 + 273 = 278 K

V2 = ?

by making  V2 subject the subject of the formula  by multiplying both side by T2

V2 = V1 xT2/ T1

V2 =  (4.24 L   x 278 K)  / 296 k  =3.98 L

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Explanation:

Answer:

Explanation:

They need to receive commands from Earth and send the data they collect back to Earth. ... These radio dishes also receive the information sent to Earth by the spacecraft. NASA spacecraft operating well out of Earth's orbit use the Deep Space Network (DSN).

Answer:

1. 0.6678 atm.

2. 181.9 mm Hg.

3. 379.8 K = 106.8°C.

4. 691.8 mm Hg.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

(P₁T₂) = (P₂T₁)

Q1:

∵ (P₁T₂) = (P₂T₁)

P₁ = 0.5 atm, T₁ = 25°C + 273 = 298 K.  

P₂ = ??? atm, T₂ = 125°C + 273 = 398 K.

∴ P₂ = (P₁T₂)/(T₁) = (0.5 atm)(398 K)/(298 K) = 0.6678 atm.

Q2:

∵ (P₁T₂) = (P₂T₁)

P₁ = 47.0 mm Hg, T₁ = 77.0 K.  

P₂ = ??? mm Hg, T₂ = 25°C + 273 = 298 K.

∴ P₂ = (P₁T₂)/(T₁) = (47.0 mm Hg)(298 K)/(77 K) = 181.9 mm Hg.

Q3:

∵ (P₁T₂) = (P₂T₁)

P₁ = 248.0 kPa, T₁ = 0°C + 273 = 273 K. .  

P₂ = 345.0 kPa, T₂ = ??? K.

∴ T₂ = (P₂T₁)/(P₁) = (345.0 kPa)(273 K)/(248.0 kPa) = 379.8 K = 106.8°C.

Q4:

∵ (P₁T₂) = (P₂T₁)

P₁ = 745.0 mm Hg, T₁ = 22°C + 273 = 294 K. .  

P₂ = ??? mm Hg, T₂ = 0°C + 273 = 273 K.

∴ P₂ = (P₁T₂)/(T₁) = (745.0 mm Hg)(273 K)/(294 K) = 691.8 mm Hg.

Answer:

The mass of copper(II)sulfate are, 89.6 grams

Explanation:

Molecules of  =

Molar mass of  = 160 g/mole

First we have to calculate the moles of .

As,  number of atoms present in 1 mole of

So,  number of atoms present in  mole of

Now we have to calculate the mass of

Therefore, the mass of copper(II)sulfate are, 89.6 grams

Answer:

b. Steady surface temperature increases were noted between the 1970’s and 90’s.

Explanation:

It was the notable observation of steady rise in surface temperature on earth around the 1970’s that brought the issue of climate change into limelight.

One of the effect of climate change is that it causes global warming. Global warming is attributed to greenhouse gases which traps heat on the earth surface and causes the surface to warm. This can lead to melting of polar ice and an increase in water volume in oceans.

Answer:

b. Steady surface temperature increases were noted between the 1970’s and 90’s.

Explanation:

The transfer of energy by heat flow through a substance is accomplished by convection.

Answer:

The real answer is conduction.

Trust me on this one, it's correct. If you put the other answer, you will get it wrong. The answer is conduction, and I am 100% positive! :)

Answer:

redox reaction

Explanation:

it's the only reaction occurs simultaneously, reduction and oxidation occur at the same time

It’s TITRATION DJDKSKDKXKDKDKKD please name me brainest

B. The hole in the ozone layer got smaller

C. The hole in the ozone layer over Antarctica got bigger.

If you look at the Dobson unit scale the lighter the color over Antarctic the greater the ozone hole gets.

Answer: Ba(OH)2.5H20

Explanation:

The salt is a hygroscopic and contains 5 moles (penta) of water attached to it, hence the ".5H2O".

Yes, blue copper sulfate pentahydrate can be ground and used as a pigment for making paint. Copper sulfate pentahydrate is a compound that contains copper, sulfur, and oxygen. When ground into a fine powder, it can create a blue pigment that is commonly used in paint.

The reason why copper sulfate pentahydrate can be used as a pigment is because of its chemical properties. Copper sulfate pentahydrate has a vibrant blue color due to the presence of copper ions. These ions absorb certain wavelengths of light, reflecting only the blue color. When mixed with a binder, such as a resin or oil, the ground copper sulfate pentahydrate can be easily applied to a surface to create a blue hue.

However, it's important to note that copper sulfate pentahydrate can be toxic if ingested or inhaled, so precautions should be taken when handling and using it. It is always recommended to follow safety guidelines and use appropriate protective equipment when working with any potentially hazardous materials.

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So you find the moles of the lead nitrate by doing mass/Mr so 25/331.2 which gives you 0.075

Due to stoichiometry in the reaction we see 1:2 ratio so we do 0.075x2 gives 0.15 moles of NaNO3

Then mass: moles x Mr so 0.15 x 85= 12.75g is your theoretical

So % yield is actual/ theoretical x 100

Therefore 6.0g/12.75 g x 100 = 47%

Not sure if it’s correct hope it helps!

WOW! I never thought of that.... Is this a question on the test?

Answer:

How will it affect the environment? Is its benefit worth the cost?

Explanation:

when creating environmental policies you should always look into if it is worth it or not and how it will affect the environment  

Answer:

It is A,B,C and D

Explanation:

I just took the test

5,6-dimethyl-2-octyne is an organic compound with eight carbon atoms in the longest chain, a triple bond starting on the second carbon, and methyl groups attached to the fifth and sixth carbons.

The subject of the question, 5,6-dimethyl-2-octyne, is a compound in organic chemistry. It is a type of Alkyne, a hydrocarbon with a carbon-carbon triple bond. In this case, 'octyne' tells us there are eight carbon atoms in the longest chain, with the triple bond starting at the second carbon. '5,6-dimethyl' tells us that there are methyl groups (-CH3) attached to the fifth and sixth carbons in the chain.

For comparison, consider 4-fluoro-4-methyl-1-octyne from your reference. '4-fluoro-4-methyl' indicates there is a methyl group and a fluorine atom on the 4th carbon, and '1-octyne' specifies there are eight carbons and the triple bond starts at the first carbon.

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The scale factor of a dilation is determined by comparing measurements of an original figure and its dilation. In the case of two-dimensional figures like circles, one common approach is to compare corresponding lengths or distances in both figures. In this case, without specific numerical measurements, we can't provide a concrete numerical value for the scale factor.

In order to find the scale factor of the dilation, it's important to understand what a dilation is first. In maths, when we are working with geometry, a dilation takes a figure and scales it larger or smaller. The scale factor is the measure by which the original figure is stretched or shrunk.

We calculate the scale factor by comparing the measurements of an original figure and its dilation. For two-dimensional figures, if we compare corresponding lengths in the pre-image and image, we can determine the scale factor. However, in this question, we aren't given specific numbers. If we assume the distance from A to B is r and from A to B' is r', the scale factor would then be r'/r.

In the special case of circles, a dilation centered at the center of the circle will create a similar circle with a scale factor equal to the ratio of their radii or, equivalently, to the square root of the ratio of their areas. If we had actual numeric values for those lengths or areas, we could provide a definite number for the scale factor.

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Answer:

Preserve paintings and different works of art

We have that for the Question "Which of these is the most accurate description of the job of an art conservationist?" it can be said that The option  bearing the description "An art conservationist is a Person who's profession is to persevere art works for as much time as possible as it gains value over time just like wine" is the best description of the job of an art conservationist?

From the question we are told

Which of these is the most accurate description of the job of an art conservationist?

Generally

An art conservationist is a Person who's profession is to persevere art works for as much time as possible as it gains value over time just like wine

Therefore

The option  bearing the description "An art conservationist is a Person who's profession is to persevere art works for as much time as possible as it gains value over time just like wine" is the best description of the job of an art conservationist?

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Answer:

139.9 g ≅ 140.0 g.

Explanation:

where, P is the pressure of the gas in atm (P = 1.0 atm, standard P).

V is the volume of the gas in L (V = 98.0 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 273 K, standard T).

∴ n = PV/RT = (1.0 atm)((98.0 L)/(0.0821 L.atm/mol.K)(273 K) = 4.37 mol.

n = mass/molar mass.

∴ mass of O₂ = (n)*(molar mass) = (4.37 mol)(32.0 g/mol) = 139.9 g ≅ 140.0 g.

The answer is:

The total energy gained is equal to 3091 Joules.

To calculate how much energy is gained by the gold, we need to use the formula to calculate the heat transfer, it's defined by the following equation:

[tex]Q=mc\Delta T[/tex]

We know that the gold melts completely (it reached its melting point or fusion temperature), so, we need to rewrite the equation as follow:

[tex]Q=mc\Delta T+m\Delta H_{fusion}[/tex]

Where,

m,is the mass of the material

c, is the specific heat of the material

ΔT, is the change of temperature.

ΔH, is the heat of fusion of the material.

So, from the statement we know the following information:

[tex]m=15.74grams\\\\\Delta T=1064\°C-32\°C=1032\°C\\\\c=0.1291\frac{Joules}{gram\°C}\\\\m\Delta H_{fusion=15.71grams*\frac{63.5Joules}{gram}=997.59Joules[/tex]

Then, substituting and calculating, we have:

[tex]Q=mc\Delta T+m\Delta H_{fusion}[/tex]

[tex]Q=15.71grams*0.1291\frac{Joules}{gram\°C}*1032\°C+997.59Joules[/tex]

[tex]Q=2093.06Joules+997.59Joules=3090.65Joules=3091Joules[/tex]

Hence, we have that the total energy gained is equal to 3091 Joules.

Have a nice day!

The magnitude of the net force acting on an object is equal to the mass of the object multiplied by the acceleration of the object as shown in the formula below. If the net force acting on an object is zero, then the object is not accelerating and is in a state that we call equilibrium.

The net force in any direction on the box is the product of its mass and acceleration of box in direction of motion.

The force is the action of push or pull which makes an object to move or stop.

The net force acting on any object is the product of the mass of the object and the acceleration of the object

F = m x  a

If an object is moving with constant velocity, the net force acting on it is zero because the object will not be accelerating or in equilibrium state.

As, the acceleration is the vector quantity, the force is also a vector quantity. Thus, in the direction of force, the box will be accelerated.

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heterogenous, because it's a mix

Hot dog relish is a heterogeneous mixture because its composition is not uniform throughout. It contains visible differences in its components, such as pieces of vegetables like cucumber, onion, and peppers that are distributed unevenly in the relish.

A hot dog relish is a heterogeneous mixture because its composition is not uniform throughout. Heterogeneous mixtures are characterized by having visible differences in their components. For example, hot dog relish contains small pieces of vegetables like cucumber, onion, and peppers that are distributed unevenly in the relish. You can visually identify the different components present in a hot dog relish, making it a heterogeneous mixture.

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whats the question?????

Answer:

1.429 g of  N₂

Explanation:

The Haber process is a reaction that combines nitrogen with hydrogen to form ammonia according to the following balanced equation:

One can note that 1 mol of N₂ react with H₂ to produce 2 mol of NH₃.

We cannot compare weight of a substance (in grams) to another in chemical reactions, but we can use moles, then we have to convert the weight of NH3 to moles.

no. of moles of NH₃ = (mass / molar mass) = (1.7 g / 17 g/mol) = 0.1 mol

and the actual yield is 98% , then the theoretical number of moles that would be produced are:  

98 = (0.1 mol /  theoretical yield) × 100

theoretical no. of moles of NH₃ = (0.1 * 100) /98 = 0.102 mol

using cross multiplication

1 mol of N₂ → 2 mol of NH₃.

?? mol of N₂ → 0.102 mol of NH₃.

no of moles of N₂ = [(1 mol * 0.102 mol) / 2 mol] = 0.051 mol

Last step is to convert the moles back to grams using:

mass = (no of moles of N₂  * molar mass of N₂)

         = (0.051 mol * 28 g/mol) = 1.429 g

Answer:

covalent bond  

ionic bond

hydrogen bond

hope this helps enjoy

Explanation:

Final answer:

The elasticity seen in solids is due to the forces between atoms acting like springs that can be stretched or compressed but not easily broken. This allows solids to return to their original shape after the external forces causing deformation are removed.

Explanation:

Elasticity in solids is a result of the atoms in the material being in close contact and vibrating but not changing positions with neighboring atoms. The forces between the atoms act like springs that can be stretched or compressed but not easily broken. This resistance to deformation and ability to return to their original shape is what causes the elasticity seen in solids. For example, when a solid is stretched, the atomic springs are stretched, but when the force is removed, the springs bring the material back to its original shape.

Answer:

15.9gmol⁻¹

The gas could have been methane when we compare the two molecular masses.

Oxygen gas, O₂ also shares this same number for its molecular mass. This would be the reason why it would not be methane.

Explanation:

Given parameters:

Volume of gas at STP = 2.0L or 2.0dm³(1L = dm³)

Mass  of the gas = 1.43g

Unknown:

Molecular mass of the gas = ?

Solution

We can find the number of moles using the mole concept according to the equation below:

          number of moles = ³⁻¹[tex]\frac{volume occupied(dm^{3} )}{22.4dm^{3}mol^{-1} }[/tex]

number of moles = [tex]\frac{2.0dm^{3} }{22.4dm^{3}mol^{-1}  }[/tex]

number of moles = 0.089mol

Using this obtained number of moles, we can derive the molecular mass of the compound by using the relationship between mass and number of moles according to the equation below:

                  molecular mass = [tex]\frac{mass}{number of moles}[/tex]

molecular mass = [tex]\frac{1.43}{0.089}[/tex]

molecular mass of the gas = 15.9gmol⁻¹

The formula of methane gas is CH₄.

Let's calculate the molecular mass of methane using these atomic masses:

C = 12g and H = 1g

The molecular mass = 12 + (1x4) = 16gmol⁻¹

The gas could have been methane when we compare the two molecular masses.

Oxygen gas, O₂ also shares this same number for its molecular mass. This would be the reason why it would not be methane.

Answer:

is very large and it provides the needed temperature for another set of fusion

Explanation:

Nuclear fusion is the combination of two atomic nuclei into larger ones.

One of such is used in making hydrogen bonds.

In nuclei fusion,

²₁ H + ²₁ H → ⁴₂He + energy

This is an example of nuclear fusion.

The energy helps to further the fusion process and a chain reaction occurs and a massive amount of energy is released.

Answer:

2Na + I₂ → 2NaI. "Synthesis reaction"

Explanation:

2Na + I₂ → 2NaI.

It is a synthesis reaction that 2 reactants give 1 product.

That 2.0 mole of Na combined with 1.0 mole of I₂ to produce 2.0 moles of NaI.

The no. of all atoms is the same in both of reactants and products side.

Na (2), and I (2).

It is seen that in first and third ones elements are not changed but only their chemical arrangements are changed. both are chemical reactions.

In the second and last one elements are changed after the reaction and as we know non chemical reactions are not capable of doing that so they are nuclear reactions.

There are other ways to tell like checking number of neutrons as well but in this simple case I don't think it is necessary to check those.

Good luck!

Answer:

B and D

Explanation:

Option A is incorrect as it is a neutralization reaction. Option C is incorrect as it an oxidation reaction, the rusting of iron to form iron oxide.  

Option B and D are nuclear reactions called alpha decay.  

In an alpha decay, a helium atom is released, and the daughter nucleus formed has atomic number 2 less than the parent nucleus and mass number 4 less than the parent nucleus.  

Answer:

+1

Explanation:

To calculate the charge on an ion, we simply use the number of protons and electrons. Protons are the positively charged subatomic particles. The electrons are the negatively charged particles in an atom.

When the number of protons are greater than that of electrons, the ion is positively charged.

When the number of protons are lesser than that of electrons, the ion is negatively charged.

When the number of protons and electrons are equal, the ion is neutral.

Charge = Protons - Electrons = 11 - 10 = +1

The net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1

Protons and electrons are used to determine the net charge on an ion. Protons are positively charged while electrons are negatively charged.

The net charge on an ion is the difference between the number of protons to the number of electrons.

The net charge of an ion = number of protons - number of electrons

The net charge of an ion = 11 - 10 = +1

Hence the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1

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Answer:

Explanation:

Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.

Answer: Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.

Explanation: Kinetic Molecular Theory can be used to explain both Charles' and Boyle's Laws. The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.

Final answer:

The pairs of valence electrons in diatomic oxygen molecules that do not participate in bonding are called lone pairs or unshared pairs (option D). These pairs are significant as they influence the molecule's shape and properties.

Explanation:

The name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecules is lone pair. These are also referred to as non-bonding electron pairs or an unshared pair (option D). In diatomic oxygen (O₂), each oxygen atom has six valence electrons. When two oxygen atoms form a molecule, they share two pairs of electrons, creating a double covalent bond. However, not all of the oxygen atom's electrons are involved in this bond; the remaining four electrons on each oxygen atom form two lone pairs.

The lone pairs are the electron pairs that reside in the outermost shell of the atom (valence shell) but are not shared or bonded with other atoms. These unshared electron pairs are responsible for the molecule's shape and properties, even though they do not participate directly in the bond formation with another atom.