2. Chemical changes often cannot be reversed because they
produce new chemical substances.
TRUE
FALSE

Answer:

SO3

It has the highest molar mass value and thus would be the least soluble

Explanation:

In this question, we want to know which of the gases is the least soluble in water.

The easiest way to do this is to calculate the molar masses of these gases. The gas with the highest molar mass is the heaviest and thus will be the least soluble in water

For CO2 - molar mass is 44 g/mol

For SO3- molar mass is 80 g/mol

For N2- molar mass is 28g/mol

For NH3-molar mass is 17g/mol

For HCl- molar mass is 36.5 g/mol

From the molar masses, we can see that the molar mass of the ammonia gas is the lightest and thus, it is the most soluble.

The mass of the sulphur vi oxide is the highest and thus it is the heaviest and the least soluble in water

Answer:

i think it's true because An element is a substance that is made entirely from one type of atom

Answer:

Solvent will be lost as gas and not return into the vessel via condensation.

Explanation:

Reflux is a technique used in chemistry to boil a particular solvent and convert the gas formed back into liquid by condensation. This technique allows a solvent to be heated at a regulated temperature but for a prolonged period of time than it would normally take place.

The reflux procedure makes use of a reflux CONDENSER, which is an apparatus that allows vapour from the heating/boiling to flow back into the reaction vessel. The CONDENSER functions to prevent the loss of the SOLVENT as vapour by providing a cooling effect on the vapour.

Therefore, if a reaction was refluxed without a condenser, THE SOLVENT WILL BE LOST AS VAPOUR

Answer:

46.6 laps

Explanation:

Step 1: Given data

Step 2: Convert "l" to km

We will use the conversion factor 1 km = 3280.84 ft.

1056 ft × (1 km / 3280.84 ft) = 0.3219 km

Step 3: Calculate the number of laps that you should run

We will use the following expression.

laps = d/l

laps = 15.0 km/(0.3219 km/lap)

laps = 46.6 laps

1. subtract 32 from 57 (57-32)

2. multiply 5/9 by (57-32)

3. equation: (57-32)×5/9

Answer:

14°C

Explanation:

Temperature is the degree of hotness or coldness of an object. It is measured using an instrument called THERMOMETER. There are different units of measuring temperature which are interconvertible. The units are Fahrenheit (°F), Celsius (°C), Kelvin (K) etc.

Answer:

aqueous acid is used as a reagent.  

Explanation:

Addition of Grignard reagent in aldehyde and followed by the acidification give rise to the primary or secondary alcohol. when the formaldehyde is used than the primary alcohol is formed otherwise secondary alcohol is formed.

in this reaction we also use the aqueous acid for the acidification as a reagent. We add aqueous acid when ethanol is present. This is because ethanol is get converted in the presence of aqueous acid into the chloroethane.  

Answer:

Mass of the salt:  105.6g of KCl.

Mass water: 958.9g of water.

Molality: 1.478m.

Explanation:

Mass of the salt:

In 1L, there are 1.417 moles. In grams:

1.417 moles KCl * (74.54g / mol) = 105.6g of KCl

Mass of the water:

We can determine the mass of solution (Mass of water + mass KCl) by multiplication of the voluome (1L and density 1064.5g/L), thus:

1L * (1064.5g / L) = 1064.5g - Mass solution.

Mass water = 1064.5g - 105.6g = 958.9g of water

Molality:

Moles KCl = 1.417 moles KCl.

kg Water = 958.9g = 0.9589kg.

Molality = 1.417mol / 0.9589kg = 1.478m

Answer:

B) pH of water is independent. A) Number of tadpoles is dependent

Explanation:Because the pH can kill fish

Answer:

The yield of the product in gram is [tex]\mathsf{{w_P}=0.26 \ gram}[/tex]

Explanation:

Given that:

the molecular mass weight of the product = 96.2 g/mol

the molecular mass of the reagent (3S)-2,2,-dibromo-3,4-dimethylpentane is 257.997 g

given that the millimoles of the reagent = 2,7 millimoles = [tex]2.7 \times 10^{-3} \ moles[/tex]

We know that:

Number of moles = mass/molar mass

Then:

[tex]2.7 \times 10^{-3} = \dfrac{ mass}{257.997}[/tex]

[tex]mass = 2.7 \times 10^{-3} \times 257.997[/tex]

mass = 0.697

Theoretical yield = (number of moles of the product/ number of moles of reactant) × 100

i.e

Theoretical yield = [tex]\dfrac{n_P}{n_R}\times 100\%[/tex]

where;

[tex]n_P = \dfrac{w_P}{m_P}[/tex]    and [tex]n_R = \dfrac{w_R}{m_R}[/tex]

Theoretical yield = [tex]\dfrac{(\dfrac{w_P}{m_P})}{(\dfrac{w_R}{m_R})} \times 100\%[/tex]

Given that the theoretical yield = 100%

Then:

[tex]100\% =\dfrac{(\dfrac{w_P}{m_P})}{(\dfrac{w_R}{m_R})} \times 100\%[/tex]

[tex]\dfrac{w_P}{m_P}=\dfrac{w_R}{m_R}[/tex]

[tex]{w_P}=\dfrac{w_R \times m_P}{m_R}[/tex]

where,

[tex]w_P[/tex] = derived weight of the product

[tex]m_P =[/tex]the molecular mass of the derived product

[tex]m_R =[/tex] the molecular mass of the reagent

[tex]w_R[/tex] = weight in a gram of the reagent

[tex]{w_P}=\dfrac{w_R \times m_P}{m_R}[/tex]

[tex]{w_P}=\dfrac{0.697 \times 96.2}{257.997}[/tex]

[tex]\mathsf{{w_P}=0.26 \ gram}[/tex]

Answer:

GCF

Explanation: Your question says "The GREATEST number of apples and oranges" Key word is "greatest".

Answer:

-10.00amu

ok.......... !!!!!

The average atomic mass of the element T is 12.012 amu.

The average atomic mass is defined as the atoms' weighted average mass in a naturally occurring sample of the element.

It is also defined as the average atomic mass of all naturally occurring isotopes of all elements.

The average atomic mass  can be expressed as

Average atomic mass = f1m1 + f2m2 + f3m3

                                    = 0.989 x 12 + 0.01 x 13 + 0.001 x 14

                                    = 11.868 + 0.13 + 0.014

                                    = 12.012 amu

Thus, the average atomic mass of the element T is 12.012 amu.

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Answer:

[tex]m=4.21g[/tex]

Explanation:

Hello,

In this case, by using the ideal gas equation:

[tex]PV=nRT[/tex]

We can compute the mass of neon gas at the given conditions by firstly computing the moles and also considering the temperature in kelvins (298K):

[tex]n=\frac{PV}{RT}=\frac{1.02atm*5.00L}{0.082\frac{atm*L}{mol*K}*298K}\\ \\n=0.209mol[/tex]

Finally, by using the atomic mass of neon gas (20.18g/mol) we compute the required mass to fill the 5.00-L container:

[tex]m=0.209mol*\frac{20.18g}{1mol}\\ \\m=4.21g[/tex]

Best regards.

The mass of neon gas will be "4.21 g".

Given:

By using Ideal Gas Equation,

⇒ [tex]PV = nRT[/tex]

or,

⇒    [tex]n = \frac{PV}{RT}[/tex]

By substituting the values,

         [tex]= \frac{1.02\times 5.00}{0.082\times 298}[/tex]

         [tex]= 0.209 \ mol[/tex]

hence,

The Mass will be:

= [tex]0.209\times \frac{20.18}{1}[/tex]

= [tex]4.21 \ g[/tex]

Thus the above answer is right.

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Answer:

A

Explanation:

the 2nd artical is against global warming while the first one uses scientific evidence

Explanation:

Accuracy refers to the closeness of a measured value to a standard or known value. For example, if in lab you obtain a weight measurement of 3.2 kg for a given substance, but the actual or known weight is 10 kg, then your measurement is not accurate. In this case, your measurement is not close to the known value.

Precision refers to the closeness of two or more measurements to each other. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise. Precision is independent of accuracy. You can be very precise but inaccurate, as described above. You can also be accurate but imprecise.

For example, if on average, your measurements for a given substance are close to the known value, but the measurements are far from each other, then you have accuracy without precision.

A good analogy for understanding accuracy and precision is to imagine a basketball player shooting baskets. If the player shoots with accuracy, his aim will always take the ball close to or into the basket. If the player shoots with precision, his aim will always take the ball to the same location which may or may not be close to the basket. A good player will be both accurate and precise by shooting the ball the same way each time and each time

Answer:mathematical and map

Explanation:

mathematical and map

Explanation:

Answer:

170ml

Explanation:

multiply the volume value by 100000

Answer:

Explanation:

The pH of a substance can be found by using the formula

[tex]p H = - log[ H^{ + } ][/tex]

where [ H+ ] is the hydrogen ion concentration of the solution

From the question

[ H + ] = 3.60 × 10^-5 M

So the pH is

[tex]pH = - log(3.60 \times {10}^{ - 5} ) \\ =4.44369749923[/tex]

We have the final answer as

Hope this helps you

Answer:

coins

Explanation:

How does the arrangement of atoms differ in a crystalline and a noncrystalline substance? Crystals have well organized arrangement of atoms. Non crystals have irregular unorganized arrangement of atoms. You just studied 13 terms!

Answer:

banking and railroads

Explanation:

The  two most common industries of the business leaders on this list are banking and railroads.

Industry is a group of productive enterprises or organizations that produce or supply goods, services, or sources of income. In economics, industries are generally classified as primary, secondary, tertiary, and quaternary; secondary industries are further classified as heavy and light.

Primary industry sector of a nation’s economy includes agriculture, forestry, fishing, mining, quarrying, and the extraction of minerals. It may be divided into two categories: genetic industry, including the production of raw materials that may be increased by human intervention in the production process; and extractive industry, including the production of exhaustible raw materials that cannot be augmented through cultivation.

Learn more about industries,here:

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Answer:either satellite tracking or probware.

Explanation:probate. Think its satalite tracking hope this helps.

Answer:

its satellite tracking

Explanation:

i got it right on edge

Answer:

an object that conveys meaning

Explanation:

Answer:

c

Explanation:

Answer:

our bodies will dehydrate causing us to die a dreadfully excruciating painful death

Answer:

When water vapor in the air comes into contact with something cool, such as the outside of a cold glass of water, its molecules slow down and get closer together. When that happens, the gaseous water vapor turns back into liquid water droplets. That's condensation.

Answer: none of the above

Explanation:

In Prokaryotic Transcription termination, it should be noted that the RNA polymerase transcribes through a terminator sequence, which in turn results in the polymerase to be separated from the DNA and thereby leads to its release of the transcrip.

Prokaryotic Transcription termination can occur in a factor dependent fashion, can occur in a factor independent fashion and may involve Rho protein.

Therefore, none of the options is false.

Answer:

speed of light = 299,000,000 m/s

Explanation:

The speed of light in vacuum, denoted as c,  is a universal physical constant which unlike space and time, is independent of the observer. It is a constant that is important in many fields of science. Its exact value is given as 299,792,458 metres per second.

In scientific notation, it is approximately given as 2.99 x 10⁸ metres per second.

2.99 x 10⁸ metres per second = 2.99  x 100000000 = 299,000,000 m/s

Therefore, when expressed in decimal notation, the speed of light = 299,000,000 m/s.

Answer:

The number of ATP molecules produced during the anaerobic phase of cellular respiration is 32 ATP.

Explanation:

Actually it's 36 ATP

8 from glycolysis

6 from pyruvate

24 from Krebs cycle

So total are 38 ATP but 2 ATP are consumed during glycolysis so total will be 36.

Answer:

The effect of the incorporation of the bill of rights was that state governments were required to provide most bill of rights protections.

Explanation:

Answer:

The definition of conceptual is something having to do with the mind, or with mental concepts or philosophical or imaginary ideas. An example of conceptual is when you formulate an abstract philosophy to explain the world which cannot be proven or seen. "Conceptual."

Explanation:

Answer:

286.55K

Explanation:

To convert to kelvin , add 237 .15

[tex]13.4\°C + 273.15 = 286.55K[/tex]

Answer:

13.4 degrees celsius =

286.55 kelvins

Temperature

13.4

Celsius

286.55

Kelvin

Formula

13.4°C + 273.15 = 286.55K

Explanation:

HOPE THAT HELPS YOU

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