Hydrogenation of cholesterol

The full burning of 6.70x10-3 g of methane results in the production of 2.95872 mass of carbon dioxide.

Burning is sometimes referred to as combustion. A fuel is heated and interacts with oxygen in a combustion reaction. The three elements of fuel, heat, and oxygen required for combustion are summarized by the fire triangle.

Chemical processes that occur during combustion are frequently quite exothermic. The energy of chemical molecules generated during this reactive process is used by combustion systems to power vehicles, produce electricity, or heat a variety of uses.

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The temperature of the silver will decrease by -828.7 °C

if it loses 982 J of heat energy

From calorimetry, we understood that heat released or lost is given by:

Q = MCΔT

Where

With the above formula, we can determine the temperature change of the silver. This is illustrated below

Q = MCΔT

-982 = 5 × 0.237 × ΔT

-982 = 1.185 × ΔT

Divide both side by 1.185

ΔT = -982 / 1.185

ΔT = -828.7 °C

Thus, the temperature will decrease by -828.7 °C

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The number of moles of the gas is 0.016 moles

The airbag reaction is the nitrogen gas obtained by the decomposition of sodium azide and the reaction is

2NaN₃ → 2Na + 3N₂

Then it is under ideal condition

P = 1atm

V = 1L

T =  495°C or 768 K

n = ?

We have to calculate moles of nitrogen = ?

R = 0.082 atm LK⁻¹mol⁻¹

So the formula is

PV =nRT

n = PV/RT

n = 1 atm×1L/0.082 atm LK⁻¹mol⁻¹×768 K

n = 0.016 moles

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For any component: Proton count equals atomic number

Number of protons plus number of electrons equals the atomic number.

The number of neutrons is equal to the atomic number-mass number.

The quantity of protons in an element's atom is known as the atomic number. The atomic number of krypton in our illustration is 36. This indicates that the nucleus of a ruthenium atom contains 36 protons.

Every atom of ruthenium has 44 protons, which is intriguing. A Ruthenium atom cannot exist if it does not have 44 protons. A distinct element is produced by changing the number of protons in an atom's nucleus. An atom of rhodium is produced, for instance, by taking one proton away from a krypton atom.

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Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore 26.55g of iron is needed to completely consume 18.5L chlorine gas at 25 degree Celsius and 1 atm pressure.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of chlorine gas =1 atm

V= volume of chlorine gas =18.5L

n =number of moles of chlorine gas

T =temperature of chlorine gas =298K

R = Gas constant = 0.0821 L.atm/K.mol

1 atm×18.5L= 0.0821×n×298K

1 atm×18.5L=n×24.4

n=0.75mol

mass of chlorine=0.75mol×35.453 g/mol

                          =26.55g

Therefore 26.55g of iron is needed to completely consume 18.5L chlorine gas at 25 degree Celsius and 1 atm pressure.

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The final solution has a strength of 2%.

Let the initial volume of solution = x unit^3

The solution is initially by 20%

Amount of solute = x*20/100

                             = x/5 unit^3

Now,  

We first diluted by 1:5

1 part of initial solution is diluted with 4 parts of diluent

For 'x' unit^3 solution,

Diluent added = 4x unit^3

Total volume of solution becomes = x+4x

                                                          = 5x unit^3

Now,

We diluted by 1:2

1 part of solution is diluted with 1 part of diluent

5x unit^3 of solution is diluted with 5x unit^3 of diluent

Final solution = 5x + 5x = 10x unit^3

Final strength = (Amount of Solute/Final solution)*100%

                       = (x/5/10x)*100%

                       = x/50x*100%

                       = 2%  

The final strength of final solution is 2%

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A Mole should not be considered a base unit in the SI system.

SI system is a metric system which is also known as the International system of units. Most of the measurements across the globe is measured by SI system. SI units are used in nearly every part of the globe, such as science, technology, mathematics and many more. The system includes coherent units known as derived units.

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Answer:

The answer is 117.

Explanation:

There’s not really a way to calculate atomic radius. It comes from empirical data and is in the periodic table. The only way I can think of is Bohr’s radius constant.

₀ = 4₀(ℎ bar)²/_e (_e)²

Calculating atomic radius can get complicated so it’s best to leave it at this.

The specific heat of the metal is 1.1106 J/g°C

Specific heat is the quantity of heat required to raise the temperature of one gram of a substance by one celsius degree

Here given data is

Mass of unknown metal = 23.8g

Temprature = 100°C

Mass of water = 50.0cm³ = 50 g

Temprature of water =  24.0°C

Final temprature of the system = 32.5°C

We have to find specific heat = ?

So first we determine the heat gain by water

Specific heat of water is 4.18 J/g°C

Q = mcΔT

Q =  50 g×8.5°C×4.18 J/g°C

Q = 1776.5 Joules

Then we determine the total heat lost by the unknown metal

Taking the specific heat f the metal to be x

Heat = 23.8g×67.5°C×x

1776.5 Joules = 23.8g×67.5°C×x

1776.5 Joules = 1606.5 J

x =  1606.5 J/1776.5 Joule

x = 1.1106 J/g°C

Specific heat of the metal is  1.1106 J/g°C

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1. Baking cookies in the oven is an example of how energy is conserved.

2. Electrical energy is neither transformed nor transferred.

3. Thermal energy either moves from one object to another as it is transferred or changes into a different form as it is transformed.

Baking is the process of cooking with dry heat, particularly in an oven. It is most likely the oldest type of cooking. Bakery goods including bread, rolls, cookies, pies, pastries, and muffins are typically made with flour or meal that comes from grains of some kind.

The stages of the ingredients originally start out in distinct states (e.g., flour is solid, eggs are liquid, etc.), and they change several times as the cookies bake. When they are combined to create cookie dough, a state known as a colloid results (like a mix between solid and liquid). Eventually, the cookies reach a solid state when baking is.

Thus, Baking cookies in the oven is an example of how energy is conserved . Electrical energy is neither transferred or transformed . Thermal energy either moves from one object to another as it is transferred or changes into a different form as it is transformed.

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Yes, a chain reaction can only  be carried out using just one atom.

We know that a chain reaction has to do with the type of reaction in which there is a a continuous self sustaining reaction. In this kind of reaction, there is one radioactive material that is bombarded by a particle such as a neutron. The bombardment of the particle would make the a cycle of reactions to begin which is able to sustain itself.

Given the fact that we only need to have a single radioactive atom that is bombarded for the process of radioactivity to occur tell us that it is a process that requires just one atom.

Take for instance, all we need is one Uranium fuel that would be bombarded with neutrons in order to have a chain reaction that involves  uranium.

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a) The number of moles of LiOH in 1.0L of 0.25M LiOH is 0.25.

b)  The mole-to-mole ratio of LiOH to OH⁻ is  1:1.

c) The number of moles of  OH⁻ ions in 1.0L of 0.25M LiOH is 0.25.

d) The pH is equal to 13.39.

A mole can be defined as a unit for the measurement of a huge number of entities of atoms, molecules, ions, or other particular particles.  The number of entities constitute in one mole is equal to 6.023 × 10 ²³ which is known as Avogadro’s constant.

The dissociation of LiOH in water is as:

LiOH (aq) →  Li⁺(aq)  + OH⁻(aq)

The mole-to-mole ratio of LiOH to OH- in the balanced chemical equation is 1 : 1 as one mole of LiOH produces one mole of OH⁻ ions.

Given, the number of concentrations of LiOH solution = 0.25 M

The volume of the solution  = 1.0 L

The number of moles of LiOH = Molarity ×Volume

n = 0.25 × 1

n = 0.25 mol of LiOH

The number of moles of ions of OH⁻ from LiOH = 0.25 mol

We know that pH + pOH = 14

pH = 14 -pOH

pH = 14 - (-log [OH⁻])

pH = 14 + log (0.25)

pH = 13.39

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The vapor-pressure lowering, AP, of an aqueous solution is 2.44Torr.

Mole = [tex]\frac{weight}{molecular weight}[/tex]

In a 1.80m (molal) solution, 1 kilogram of the solvent contains 1.80 moles of the solute (which is water in this case).

Water's molar mass is equal to 2(atomic mass of H) + [2(1)+16] (atomic mass of O).

=18g/mol

The mole of water in 1 kilogram (equivalent to 1000 grams)::

[tex]n_{H_{2} O}[/tex]= [tex]\frac{1000}{18g/mol}[/tex] = 55.56mol

The solute's mole fraction in the 1.80 m solution is as follows::

[tex]x_{solute}[/tex] = [tex]\frac{n_{solute} }{n_{H_{2}O }}[/tex]

   ⇒[tex]x_{solute} =[/tex] [tex]\frac{1.80}{55.56}[/tex] = 0.032

a. Sucrose is a non-electrolyte, i.e., it does not undergo dissociation in the aqueous solution.

As a result, the Van't Hoff factor for sucrose is = i = 1

The lowering in vapor pressure of the solution, which is 1.80m in sucrose:

=[tex]ix_{solute}p^{0}[/tex]

=(1)(0.032)(17.54)Torr

=(0.56)Torr

b. Aluminum chloride dissociate in water as follows:

[tex]AlCl_{3}[/tex] →[tex]Al^{3+}+ 3Cl^{-}[/tex]

As a result, an aqueous solution containing one aluminum chloride particle yields four more particles.

Thus, i=4

The lowering in vapor pressure is thus:

=[tex]ix_{solute}p^{0}[/tex]

=(4)(0.032)(17.54)Torr

=(2.24)Torr

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Any object which have less density than the mercury will float in it and which have higher density will sink on it. Here, gold has higher density than  mercury. Thus it will sink on mercury.

Density of a substance is the measure of its mass per volume. Thus it says about how much denser the substance is in a specific volume. The ratio of density of an object to the density of  water is called specific gravity.

The density of mercury is 13.4 g/ml. Any object which is less dense than mercury will float on its surface whereas, objects which have higher density than mercury will sink on it.

The density of gold is 79.3 g/ml. All other given metals iron, lead and copper have a density less than that of mercury. Hence the substance which sink on mercury is gold. Option Dis correct.

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Explanation:

I can't see the questions!!

For the grape juice, we get that the hydroxyl ion concentration is  1.4 ×10-10M.

Hence, pOH will be = -log[1.4*10⁻¹⁰] which is approximately 9.6.

Now the value of pH will be = 14-pOH = 14 - 9.6 = 4.4.

For the orange juice, we know that the H+ or hydronium ion concentration is  1.8 × 10-4 M.

Then, the value of the pH will be= -log[1.8*10⁻⁴]=3.7.

Thus from the above result, it is clear that the range juice has lower pH, hence it will be more acidic. While the grape juice will be less acidic.  

The pH can either go up or down depending on the change in hydronium concentration. If the hydronium concentration increases, the pH decreases, causing the solution to become more acidic. This happens when an acid is introduced. As H+ ions dissociate from the acid and bond with water, they form hydronium ions, thus increasing the hydronium concentration of the solution. If the hydronium concentration decreases, the pH increases, resulting in a solution that is less acidic and more basic. This is caused by the OH^- ions that dissociate from bases

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Answer:

In each test, iron(II) sulfate and iron(III) nitrate were combined with the same substance or substances. However, the sulfate and nitrate parts of the compounds didn’t participate in any of the chemical reactions; only the iron ions reacted. Comparing the results for each pair of tests, what can you conclude about the iron(II) and iron(III) ions? i need the answer to it please do this

There are various kind of reaction like combustion reaction, displacement reaction. So to solve this problem we must be knowing the displacement reaction. Displacement reaction is taking place over here

What is displacement reaction?

Displacement reaction is a reaction in which one atom replaces other atom from a molecule on the basis of reactivity strength. The element which on the top of reactivity series displace the element that is lying below to that reactive element

According to our question the balanced equation is

FeSO₄+Zn ZnSO₄+Fe(II)

Fe(NO₃)₂+Zn      Zn(NO₃)₂+Fe(II)

In both reaction Zn is more reactive than Fe(II) and Fe(III) that is why Zn replace or displace iron ion from its compound of sulfate and nitrate. Metal displace metals. anions are displaced by anions. So, here metal is displaced by zinc.

Thus we can conclude that zinc is more reactive than iron Fe(II) and Fe(III). Displacement reaction is taking place over here

Hope this helps!

The maximum possible efficiency of the heat engine that uses reservoirs at 800°C and 0°C is 74%.

Maximum efficiency is mainly calculated for heat engines.

Let the starting temperature be T1 and the 2nd temperature is T2.

Since the given temperatures are in Celcius form, we have to first convert the temperatures into Kelvin form for proper calculation of maximum efficiency.

So, T1 = 0 + 273 = 273 K

T2 = 800 + 273 = 1073 K

We know,

Maximum efficiency = (T2- T1)/T2

= (1073 - 273) / 1073

= 800 / 1073

= 0.74

= 74 %

Therefore, the maximum efficiency of the heat engine will be 74%.

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Answer:

c. a reaction in which oxidation numbers change

Explanation:

In an oxidation reaction there is loss of electrons whereas in a reduction reaction there is gain of electrons. Therefore, a reaction in which oxidation numbers change identifies an oxidation-reduction reaction.

Answer:

C: a reaction in which oxidation numbers change.

Explanation:

Explanation:

as the number of shell increased the size of the atom increase but the same shell with different number of valence electron, as electron number increase the attraction between nucleus and valance electron increased then the atom becomes shrinks and so the size of it decreased.

The most likely will happen to smoke in the atmosphere is over time, the solid particles will settle on whatever is outside (Option C).

Smoke can be defined as any group or mixture of small particles that may be present in different states of matter in the air (i.e., in the solid state, liquid state and or gas state), generally composed of burning fossil fuels or carbon.

Therefore, with this data, we can see that smoke is generally composed of carbon but it is also represented by other types of particles in suspension in the atmosphere.

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A chemist adds a buffer to a solution because the buffer can keep the pH stable when small amounts of acid or base are added. Thus, Option A is correct.

Buffer is a solution that resists the change in pH when acid or alkali is added in a small amount. Buffer is made up of weak acid and its conjugate base or a weak base and its conjugate acid. It absorbs H+ and OH- ions when strong acid or alkali is added so that the pH remains the same and neutralizes the added acid or alkali. While maintaining the pH of the solution, the pH of the buffer changes in a small amount.

Thus, a chemist adds a buffer to a solution to keep the pH constant when strong acid or base is added.

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Avogadro's constant is the same as the number of copper II sulfate formula units in 160g of copper II sulfate; option C.

Avogadro's constant is a number that describes the number of particles in 1 mole of a substance.

The value of the Avogadro constant is 6.02 * 10²³.

The carbon-12 isotope is used as the standard to define the mole of a substance.

12 grams of the carbon-12 isotope contains the Avogadro number of particles which is equal to 6.02 * 10²³.

Hence, 1 mole of a substance is defined as the amount of a substance that contains as many elementary particles as there are in 12 grams of carbo-12.

Considering the given substances:

a. 24g of magnesium off magnesium contains two moles of magnesium atoms.

b. 14g of nitrogen gas contains 0.5 moles of nitrogen gas molecules

c. 160g of copper (ii) sulfate contains 1 mole of copper (ii) sulfate formula units. Hence, this is equal to the  Avogadro constant

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Answer: 1 one is B 2 one is C 3 one is A

The sun, moon, and planets of the solar system are shown with their orbits.

The loops in Ptolemy’s

1 one

A retrograde

B geocentric

C retrograde

model, and those shown on the video, are called

2 one

A heliocentric

B geocentric

C retrograde

motion.

This phenomenon is caused by Earth’s

3 one

A faster

B slower

C larger

orbit than those of other planets.

A sample containing 4.5 g of an unknown gas. Based on the volume, temperature, and pressure of the sample, there are 0.14 moles of gas present.  the molar mass of this unknown gas is

given that :

the mass of unknown gas = 4.5 g

number of moles of unknown gas = 0.14 mol

the number of moles is given as :

number of moles = mass / molar mass

molar mass of unknown gas =  mass / moles

                                               = 4.5 / 0.14

                                               = 32.14 g/mol

Thus, A sample containing 4.5 g of an unknown gas. Based on the volume, temperature, and pressure of the sample, there are 0.14 moles of gas present.  the molar mass of this unknown gas is

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Volume should you dilute 35 mL of a 12 M stock HCl solution to obtain a 0.500 M is 840 mL,

Given that :

Molarity of the solution M1 = 12 M

volume of the solution V1 = 35 mL

Molarity of the solution after the dilution M2 = 0.500 M

volume of the solution after the dilution V2 = ?

the dilution law states that :

M1 V1 = M2 V2

12 × 35 = 0.500 × V2

V2 = 840 mL

Thus, Volume should you dilute 35 mL of a 12 M stock HCl solution to obtain a 0.500 M is 840 mL.

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