A 57.6 g sample of methane (CH4) is found to contain 43.2 g of carbon. What is the
percent composition of Carbon and Hydrogen? How much hydrogen (in grams) would a
37.8 g sample of methane contain?

The equation for this reaction is

[tex]\text{Mg}+\text{O} \longrightarrow \text{MgO}[/tex]

This means that for every mole of magnesium consumed, 1 mole of magnesium oxide is produced.

So, the answer is 0.094 moles.

The conductance of the electric current through the electrolytic solution increases with increase in concentration.

An electrolytic solution is a solution containing dissolved electrolyte.

The ions of the electrolyte dissociate and are able to carry electric current around the electrolytic cell.

The higher the concentration of the electrolyte, the more electric current it can conduct due to greater number of ions present.

Therefore, the conductance of the electric current through the electrolytic solution increases with increase in concentration.

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In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.

An abiotic factor is a non-living part of an ecosystem that shapes its environment.

Biotic and abiotic factors make up a community via interaction.

Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.

Hence, in this case, among the list of components given, the abiotic factors are water, rock, soil, sun

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[tex] \begin{gathered}\\ \underline{\boxed{\large\leadsto\frak\red{ Answer :- }}} \\ \end{gathered}[/tex]

What is an abiotic factor?

♠ Among the list of components given, the abiotic factors are water, rock, soil, sun

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Americium is a radioactive element .

The nuclear reaction.is given by

[tex]\rm {}^{241}_{95}Am\longrightarrow {}^{237}_{93}Np+{}^4_2\alpha[/tex]

Here alpha can be written as He too

The mass of [tex]Na_2CO_3[/tex] that will be required to be dissolved in water would be 15.9 grams

Recall that:  molarity = mole/volume in L

In this case, the volume is 0.3 L and the molarity is 0.5 M.

Thus, mole = molarity x volume = 0.5 x 0.3 = 0.15 moles

Mass of 0.15 moles  [tex]Na_2CO_3[/tex] = 0.15 x 106 = 15.9 grams

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The solid would be caught on a filter paper or membrane while the liquid passes through.

Filtration is used to separate a mixture of insoluble substances in a liquid.

Since the aim is to separate the insoluble component of the mixture from the liquid, filtration using a suitable filter paper or membrane will be the way out.

The liquid will pass through the filter paper or the membrane while the insoluble component will be caught. This can then be dried and collected accordingly.

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Answer: The answer is true.

Explanation: Avogadro's number is a mole, which concludes that this statement is true.

5mol produces -10.941KJ

4 mol let produces x KJ

Solve through proportion

5moles of octane produces -10941KJ

1mol of octane produces 2188KJ

4mol of octane produces

Answer:

During DNA replication, each of the two strands that make up the double helix serves as a template from which new strands are copied. The new strand will be complementary to the parental or “old” strand. Each new double strand consists of one parental strand and one new daughter strand.

Explanation:

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An aqueous solution of an arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt.

This is a compound which is formed as a result of a neutralization reaction between acid and base.

Arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt due to increased concentration of H+ and OH- respectively.

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Salt and sugar have strong attractive forces whereas oil has weak attractive forces between particles.

The attractive forces between particles in the salt and sugar substances have strong because of its solid state while on the other hand, the attractive force between particles of oil is weak because of its liquid state.

So we can conclude that salt and sugar have strong attractive forces whereas oil has weak attractive forces between particles.

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The strength of the attractive forces between the molecule of oil, sugar and salt increases from oil to sugar to salt.

The melting point of a substance is the temperature at which the solid substance melts.

The melting point of a substance is a constant for a pure substance.

The higher the attractive forces between the molecules of a substance, the higher the melting point will be.

Between the three substances, oil has the lowest melting point while salt has the highest melting point.

Therefore, the strength of the attractive forces between the molecule of oil, sugar and salt increases from oil to sugar to salt.

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The balanced redox reaction, if it occurs in acidic solution, is

5C₂O₄²⁻(aq) + 2MnO₄⁻(aq) + 16H⁺-----> 10CO₂(g) + 2Mn²⁺(aq) + 8H₂O(l)

Redox reactions are those in which loss and again of electrons occur.

To balance the redox reaction, we must first break the whole reaction into half equations;

Oxidation half equation

[tex]\rm 5C_2O4^2^-(aq) + 10e + 8H^+----- > 10CO_2(g) + 4H_2O(l)[/tex]

Reduction half equation

[tex]\rm 2MnO_4^- (aq) + 10e + 8H^+----- > 2Mn^2+(aq) + 4H_2O(l)[/tex]

Now combine both the reactions

[tex]\rm 5C_2O_4^2-(aq) + 2MnO4^- (aq) + 16H^+----- > 10CO_2(g) + 2Mn^2+(aq) + 8H_2O(l)[/tex]

Thus, the coefficient of H₂C₂O₄ is 5 and that of water is 8.

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The gas molecules move between the system and the surroundings follow PV=nRT.

The smallest particle of a substance has all of the physical and chemical properties of that substance.

An increase in pressure pushes the molecules closer together, reducing the volume. If the pressure is decreased, the gases are free to move about in a larger volume.

In the kinetic theory of gasses, increasing the temperature of a gas increases in average kinetic energy of the molecules, causing increased motion.

The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.

At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas. At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.

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Answer:

increasing the pressure

Explanation:

You can make a solution more concentrated by increasing the pressure.

The maximum volume of hydrogen evolved at room temperature and prressure after taking excess zinc with 0.01 mol HCl is 2.4 [tex]dm^{3}[/tex]

hence correct option is (C)

According to this law, the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant.

Given Equation ;

Zn + 2HCl --> [tex]ZNCl_2[/tex] + [tex]H_2[/tex]

Given Quantities ;

Amount of Zinc = Excess

Amount of 1.0 mol/ltr HCl = 100 ml

It means, Number of moles of H = 0.1 mole

Temperature = 298 K

Pressure = 1 Atm

This is a “single state” problem, so we can solve it using the ideal gas law, PV = nRT.

therefore, using Ideal gas equation ;

PV=nRT

1 x V = 0.1 x 0.0821 x 298

volume of hydrogen gas = 2.4 litre ie, 2.4 [tex]dm^{3}[/tex]

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Electrical engineers are the scientists that study the production of electricity more efficient.

Electrical engineers are the type of scientist that would most likely study how electricity could be produced more efficiently because they produced new technologies which are cost efficient as well as produce high amount of electricity.

So we can conclude that electrical engineers are the scientists that study the production of electricity more efficient.

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The actual yield of the experiment given the data from the question is 92.4 g (Option B)

This is the ratio of the actual yield to the theoretical yield of a given reaction multiplied by 100

Percentage yield = (Actual / Theoretical) × 100

This is the amount obtained from the expriment procedures

This is the amount obtained from simple calculations as regarding the experiment.

Actual yield = percentage yield × theoretical yield

Actual yield = 80.34% × 115

Actual yield = 0.8034 × 115

Actual yield = 92.4 g

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The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.

A beta minus decay is one in which an electron is changed into a proton. The atomic number of the daughter nucleus will increase by one unit and is one place after the parent in the periodic table.

The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.

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Answer:

Coating a material with metal

(SInce the glasses will be coated with gold.)

An atom has eight protons and nine neutrons. The atomic structure of the atom is attached below in image.

The term "atomic structure" describes the structure of an atom, which has a nucleus that contains both protons and neutrons . The centre of the nucleus is circled by the negatively charged electrons.

The smallest piece of ordinary matter within an element is called an atom. Protons, neutrons, and electrons are the three subatomic particle types that make up an atom.

An isotope's number is equal to the sum of its protons plus neutrons since their masses are almost identical. Oxygen 16 therefore has 8 protons and 8 neutrons, followed by oxygen 17 with 8 protons and 9 neutrons, and oxygen 18 with 8 protons and 10 neutrons.

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multiplying terrorist to power 23, divided by 96. Multiplied by 12.7. so this is 76.48

7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate. A particle is a tiny, localized item.

A particle is a tiny, localized item that may be defined by a number of physical or chemical characteristics, including volume, density, and mass. They range significantly in size or number from tiny particles like atoms to subatomic particles such as the electron.

Depending upon their density, particles can potentially be utilized to mimic even bigger things, such as moving celestial bodies or a throng of people. Although the meaning of the word particle is quite broad, different scientific disciplines might refine it as necessary. Any substance made up of particles is referred to as a particulate.

number of moles = given mass/ molar mass

                            = 12.7/  96.08

                            = 0.13moles

number of particle=  0.13 ×   6.022×10²³  

                              = 7.96 x 10²²    

Therefore, 7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate.

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The volume of excess oxygen will 2.28 L

From the equation of the reaction:

[tex]CH_4(g) + 2O_2(g) --- > CO_2(g) + 2H_2O(g)[/tex]

The mole ratio of the two reactants is 1:2.

1 mole of gas at STP = 22.4 L

Mole of 29.2 L of methane at STP = 29.2/22.4 = 1.3 moles

Mole of 63.3 L of oxygen at STP = 63.3/22.4 = 2.8 moles.

Thus, oxygen is in excess because 1.3 x 2 = 2.6 moles is needed to react with 1.3 moles methane.

Excess mole of oxygen = 2.8 - 2.6 = 0.2 moles

Volume of 0.2 moles at STP = 22.4 x 0.2 = 2.28 L

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Answer:

Energy can neither be created nor destroyed, but it does change its form. And not all forms of energy are usable and it gets dissipated as heat energy and sound energy. The energy that is wasted cannot be recovered.

Answer:

1.3 M

Explanation:

The formula mass of lithium fluoride is 7+19=26 g/mol. This means that in 52 grams of LiF, there is 2 moles.

Molarity = (moles of solute)/(liters of solution), so the answer is 2/1.5 = 1.3 M

Addition of pure water does not change pH of a solution because pure water has neutral pH.

Even though you continue to add pure water into a substance, the acidity or alkalinity of substance still remains the same to that of substance because pure water has neutral pH which can't change the acidity or alkalinity of a solution.

So we can conclude that addition of pure water does not change pH of a solution because pure water has neutral pH.

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When a solid dissolves in a liquid to form a solution, solid particles become evenly dispersed among liquid particles.

Solutions are formed when a solute particle dissolves in another substance known as a solvent.

Usually, solutions are formed when solids dissolve in liquids.

The solid is the solute while the liquid is the solvent.

When a solid dissolves in a liquid, solid particles become evenly dispersed among liquid particles.

Therefore, solutions are formed when solute particles dissolve in solvents.

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Answer:

c

Explanation:

chem ed 2022

Answer:

The correct answer is A, or "so they can effectively communicate their findings.

Explanation:

The metric system is the international system of weights and measures, which is used universally in the scientific community. Scientists benefit from the metric system so that they can communicate theories, ideas and most importantly data in a way everyone understands. It is virtually impossible to comprehend any modern, data-rich research in the natural or physical sciences without referring to the metric system and being able to contextualize the numbers and units it includes.

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