If an Element has 67 Protons and 68 Neutrons, how many electrons does the element have?

The system should be heated gently so that the solvent boils and the vapors extend no more than halfway up the condenser.

Boiling is the fast vaporization of a fluid, which happens when fluid is warmed to its bubbling point, the temperature at which the vapor weight of the fluid is rise to the weight applied on the fluid by the encompassing air.

There are two fundamental sorts of bubbling: nucleate bubbling where little bubbles of vapor shape at discrete focuses, and basic warm flux bubbling where the bubbling surface is warmed over a certain basic temperature, and a film of vapor shapes on the surface.

In thermodynamics, heating a system, the prerequisite for the bubbling of unadulterated substances to happen is that T divider = T sat. But in genuine tests, bubbling does not happen until the fluid is warmed some degrees over the immersion temperature.

The surface temperature must be to some degree over the immersion temperature in arrange to maintain vapor arrangement.

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Answer:

Clinkers

Explanation:

Clinkers are generally considered to form by fragmentation of an upper vesiculated crust due to an increase in apparent viscosity and/or to an increase in shear strain rate

Answer:D

Explanation:plato

Answer:

Explanation:

Here, we want to calculate the percentage yield of the reaction

Mathematically, we have that as:

The mass of the product NO given in the question is the actual yield which is 27.50 g

Now, let us get the theoretical yield

We find the number of moles of nitrogen gas that reacted

Mathematically, that is the mass of nitrogen gas divided by the molar mass

The molar mass of the nitrogen gas is 28 g/mol

The number of moles is thus:

From the equation of reaction, 1 mole of N2 yields 2 moles of NO

Thus, 0.5814 mol of N2 will yield:

Now, to get the mass of NO produced, we multiply this number of moles by the molar mass of NO

The molar mass of NO is 30 g/mol

The mass that was produced is thus:

Finally, we have the percentage yield as:

By using the Henderson-Hasselbalch equation, we can calculate that the concentration of acetic acid in the given buffer is 57.5 mM.

When calculating the pH value of a buffer system, we use the Henderson-Hasselbalch equation:

[tex]pH = pK_{a} + log\frac{[base]}{[acid]}[/tex]

pKa - the negative logarithm of the acidic constant (for acetic acid, pKa = 4.76)

[base] - concentration of the basic (sodium acetate) component

[acid] - concentration of the acidic (acetic acid, AcOH) component

If we plug the known values (pH = 5; [base] = 100 mM; pKa = 4.76) in the equation we get:

[tex]5 = 4.76 + log\frac{100 mM}{[AcOH]}[/tex]

[tex]log\frac{100 mM}{[AcOH]} = 5-4.76[/tex]

[tex]log\frac{100 mM}{[AcOH]} = 0.24[/tex]

[tex]\frac{100 mM}{[AcOH]}= 10^{0.24}[/tex]

[tex]\frac{100 mM}{[AcOH]}= 1.74[/tex]

[AcOH] = 100 mM / 1.74

[AcOH] = 57.5 mM

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Melting and boiling points of a pure liquid are intensive physical quantities whereas mass and volume are fundamental physical quantities.

The typical definition of the melting point is the temperature at which a substance transforms from a solid to a liquid.

The temperature at which a liquid under atmospheric pressure changes from a solid to a liquid is known as its melting point. Here, both the liquid and solid phases coexist in equal amounts. The substance's melting point is listed under standard pressure, although it varies with pressure as well.

The temperature at which a liquid's vapour pressure equals the surrounding atmosphere is known as the boiling point of the liquid. This temperature causes the liquid to become a vapour.

The boiling point of the liquid is influenced by the atmospheric pressure. When a liquid is at high pressure, its boiling point is higher than when it is at atmospheric pressure. Different liquids have variable boiling points at a specific pressure. The standard boiling point of a liquid was established by IUPAC in 1982 as the temperature at which a liquid starts to boil at a pressure of one bar.

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We will be able to tell if the spread is margarine if it has been hydrogenated.

A liquid unsaturated fat can be made into a solid fat by the process of hydrogenation. In order to make an unsaturated fat saturated, hydrogen atoms must be injected into it. Trans fat, a particular form of fat, is created during this hydrogenation process.

An unsaturated fat undergoes hydrogenation, changing from a liquid to a solid. Unsaturated fats become saturated ones as a result of this process. The remaining unsaturated fats undergo another molecular shape change during this phase. An "trans" form is the end outcome.

We must maintain both of them at room temperature in order to analyze the unidentified spread. The process of hydrogenating corn oil results in the production of margarine.

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The gas constant is equal to R=8.314 J/mol K, while the atomic mass of helium is equal to M=4.0 g/mol. M = 4.0 g / m o l . As a result, the helium atom's rms speed is 1304.7 m/s. So, 515 m/sec is the root-mean-square speed.

The value of the square root of the sum of the squares of the stacking velocity values divided by the quantity of values is the root-mean square (RMS) velocity. The RMS velocity is the speed of a wave traveling along a certain ray path across subsurface strata with various interval velocities.

The expression v=sqrt(3RTM) and v=sqrt(3KTm), where R is the universal gas constant, T is the absolute (Kelvin) temperature, m is the molar mass, K is the Boltzmann's constant, and M is the molecular mass, gives the root mean square (R.M.S.) speed V of the molecules of an ideal gas.

Since the particles in a typical gas sample are flowing in all directions, the average velocity for that sample is zero, which is why we use the rms velocity instead of the average. This is an important formula since the particle velocity controls both the diffusion and effusion rates.

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A Sample of propane, a component of LP gas has a volume of 35.3L at 315K and 922torr. Its volume at STP is 37.6 L.

STP conditions are defined as a pressure of

100kPa= 100kPa.  1atm / 101  . 325kPa   . 760torr/1atm

= 750.1torr

And a temperature of 0ەC = 0ەC +273.15= 273.15K

So, from here we knew that both pressure and temperature of the gas are changing. Here we use combined gas law equation.

The combined gas law is an amalgamation of the three previously known laws which are Boyle’s law PV = K, Charles law V/T = K, and Gay-Lussac’s law P/T = K. Therefore, the formula of combined gas law is PV/T = K,   Where P = pressure, T = temperature, V = volume, K is constant.

P1V1/T1 = P2V2/T2

Here P1, V1 and T1 are the pressure volume and temperature of the gas at an initial stage.

And P2, V2 and T2 are pressure volume and temperature of the gas at final stage.

So,

  P1V1/T1 = P2V2/T2

= > V2 = (  P1 .T2 /P2.T1).V1

Put all values in the expression.

  V2 = (922torr . 273.15K /750.1torr . 315K ) . 35.3L

        =   37.6 L

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New crust is found at the center of the mid-ocean ridge, proving the movement of the seafloor and the surface of the Earth and is denoted as option D.

These are structures which are formed where two tectonic plates are spreading apart and therefore forms the seafloor which is present in larger types of water bodies such as sea, oceans etc.

There is also the presence of new crust at the center and it helps to prove movement of the surface of the earth which is therefore the reason why it was chosen as the correct choice.

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There would be seven peaks if you could observe them all while considering no decomposition of the ion into smaller fragments.

Each sulfur isotope would give a peak so there are three possible combinations of the hydrogen isotopes:

H-H (m/z = 2), H-D (m/z = 3) and D-D (m/z = 4).

Thus, you will find 4 × 3 = 12 components for the molecular ion.

However, some of these peaks will overlap each other so the stable isotopes of sulfur have masses 32, 33, 34, and 36.

Thus, the expected peaks will be:

32S:m/z=34,35,36

33S:m/z=35,36,37

34S:m/z=36,37,38

36S:m/z=38,39,40

If every peak were visible, you would see seven peaks in total.

They would have m/z = 34, 35, 36, 37, 38, 39, 40.

Isotope peaks are ionic parts of the same chemical equation that are more often than not visible to different adjoining crests inferable to particles of distinctive isotopic compositions.

The number of isotope crests and the relative concentration of each crest depends on the chemical equation of the ionic part and the normal isotopic composition of its constituent components.

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Option C ;(NH4)2SO4 is the formula for ammonium sulfate.

It is an inorganic salt. It appears as fine white crystals. Its molecular weight is 132.14g/mol. Its density is 1.77g/cm³.It has many commercial uses. It is mainly used as fertilizer for alkaline soils because ammonium ions forms small amounts of acid which lowers the pH of the soil.

It is acidic with pH of 5.5. Its melting point is 235 °C. it is soluble in water. It is obtained by the reaction of sulfuric acid with ammonia. Sulfuric acid will react with two equivalents of ammonia.

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Answer:

C. (NH4)2SO4

And the second question is

A. KOH

Explanation:

Answer:

Element XX has a relative atomic mass of 6.86 aum

Explanation:

See attached worksheet.

The disadvantage of increasing our use of solar energy is that unfortunately currently, the production and storage of solar energy is bit as cost efficient when compared to obtaining the same quantity of energy from fossil fuels.



Answer:

The Earth's Crust is like the skin of an apple. It is very thin in comparison to the other three layers. The crust is only about 3-5 miles (8 kilometers) thick under the oceans(oceanic crust) and about 25 miles (32 kilometers) thick under the continents (continental crust).

Explanation:

you butt is thick in kilometers

;)

The Water does not dissolve sand, but it does dissolve sugar. In order to dissolve the mixture in water. Sand will settle and sugar and water will separated combine to produce a solution.

Sugar can be obtained by the crystallization, while sand can be filtered and separated. The Filtration and evaporation can be used to separate the salt and sand mixture. Sand can be separated by filtering a mixture of sand and salt solution (salt dissolved in water). After filtering, sand remains as a residue on the filter paper. Now it is possible to make common salt by boiling the filtrate.

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Bases can be formed by the direct combination of the elements that form the bases.

Bases are substances that react with acids to form salt and water only.

Bases are usually oxides or hydroxides of metals.

Bases have the property of turning red litmus blue.

The formation of a base will involve the direct combination of the constituent elements.

For example, the formation of the bases magnesium oxide and ammonia is shown below:

Ammonia: N₂+ 3 H₃ ---> 2 NH₃

Magnesium oxide: 2 Mg + O₂ ---> MgO

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This canyon is an example of how the surface of Earth changes slowly due to the slow and gradual process of erosion by water and wind.

The slow and gradual process of erosion by water and wind is responsible for the slow change in the surface of Earth demonstrated by the canyon.

The canyon demonstrates how the surface of Earth changes slowly due to the process of erosion by water and canyon, which gradually wear away the rock and reshape the landscape over millions of years.

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Answer:

I don't know why 27.6 g is not the correct answer.  I believe that it is correct.

27.6 grams of [tex]H_{2}[/tex].

Explanation:

The balanced equation tells us that 17 moles of hydrogen will react completely with 8 moles of carbon monoxide.  That is a molar ratio of 17/8 moles H2/molesCO.

If we start with 6.5 moles of CO, we need:

(6.5 moles CO)*(17/8 moles H2/moles CO) = 13.8 moles of H2 (3 sig figs)

Convert 13.8 moles of H2 into grams H2 by multiplying by the molar mass iof H2 (2g/mole):

(13.8 moles H2)*(2 g H2/mole H2) = 27.6 grams of [tex]H_{2}[/tex].

Density of a substance is the ratio of its mass to volume. Specific gravity of the substance is the ratio of its own density to the density of water. Thus, dividing its density by density of water.

Specific gravity of an object is the ratio of its density to the density of water. In fact it is related to the gravity itself in water. This ratio determines whether the object float or sink to the bottom of water.

If the specific gravity is greater than one, which means the object is denser than water and it will sink to the bottom of water because of its weight. If the specific gravity is less than one, then the object have less density than water and it will float on water.

All the floating objects have a specific gravity of less than one. Irrespective of the weight of the objects they floats because of their higher density than water.

Ice floats on water where a stone will sink. Similarly large ships, canoes etc are floating because of their smaller specific gravity. This way we can compare the floating property using specific gravity.

Therefore, specific gravity of a substance can be found by dividing its density by the density of water.

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The mass percent of the salt is 33.33%

The percentage of a solution's mass that is made up of solutes is known as the mass percent. This percentage is measured in relation to the total mass of the solution.

The term "mass percent composition" also refers to weight percentage. It is referred to as w/w%. The formula for mass percent in a solution is the mass of an element in one mole of the compound divided by the compound's molar mass, then multiplied by 100%.

Total mass of solution = 75g

The mass percent of the salt= 25/75×100%

The mass percent of the salt= 33.33%.

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In the chemical reaction between Fe(II) ions and dilute sulfuric acid when hydrogen peroxide is added Fe(II) gets converted to Fe(III) ,on retaining mixture and adding NaOH precipitate of ferric hydroxide is obtained.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer: Should actually be Calcium Sulfide

Explanation: Alkali metal + non metal = salt.

2nd element in compound should either end in -ide or

Answer: The part I think you messed up on is the atoms not all of them have 0 and 1. Sodium Chloride has 2 atoms. Other than that it looks amazing! Hope this helps!

The units that are left in each case are;

1) mile

2) atoms

The term conversion factor has to do with the way that we are able to use a given set of numbers to be able to help us to convert from one unit to another. This is very important especially when we are dealing with something that involves calculations and makes the use of computational methods very easy.

Let us now look at the image that has been shown in the question. We have to recall that some units have to cancel out so that we can be able to get the target unit that we are looking for in the course of the conversion as shown.

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Answer:

Explanation:1 g CH

4

​

,C

2

​

H

6

​

C

3

​

H

8

​

C

4

​

H

10

​

T = 350 K, P = 1 atm

PV=nRT=

M

w×R×T

​

1×V=

58

1

​

×0.0821×350

V=0.495 L

V=495cm

3

London dispersion forces would be the only intermolecular force holding two methane molecules together.

The least powerful intermolecular force is the London dispersion force. When the electrons in two nearby atoms occupy positions that cause the atoms to temporarily form dipoles, the consequence is the London dispersion force, a transient attractive force. The term "induced dipole-induced dipole attraction" is frequently used to describe this effect.

Argon, hydrogen gas, fluorine gas, and methane are non-polar particles that solely have London dispersion forces between their atoms or molecules.

When molecules and/or ions are sufficiently close to one another, it is presumed that these dispersion forces exist between all of them. It is believed that ions and dipoles produce stronger, farther-reaching electrical forces that work in addition to those already mentioned.

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Answer:

Explanation:

Mendelevium and californium , both synthesize differently because Mendelevium is a synthetic element and californium is a radioactive chemical element.

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The composition of the mixture is 2.5 moles of HI, 0.75-mole I₂, and 0.75 moles of H₂.

The act of combining elements or elements to shape an entire. the ensuing nation or product. manner of being composed; structure: This portrait has an orderly composition. make-up; constitution: His ethical composition becomes impeccable.

A composition can discuss with any innovative painting, be it a quick story, poem, essay, studies paper or a piece of tune. consequently, the principle difference between essay and composition is that essay is a form of composition whereas composition refers to any innovative paintings.

                       H₂ + I₂ = 2HI

initial             2mol  2     0mol

final                                   2.5 mol

limiting reagent is  I₂

2 mole of HI is produced by 1 mole of  I₂

2.5 mole of  I₂ is produced by = 1/2 × 2.5

                                                  = 1.25 mole

The final composition of the mixture = 2.5 moles of HI, 0.75-mole I₂, and 0.75 moles of H₂.

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