Two oxides of sulphur A and B analysed and the result obtained shows that in oxide A 3.50g of sulphur combined with 6.05g of oxygen and in oxide B 2.80g of sulphur combined with 2.80g of oxygen show that this results illustrate the law of multiple proportion. Write their formulae​

The complete thermochemical equation of the reaction above is: 2CO₂(g) + 5H₂(g) --> C₂H₂(g) + 4H₂O(g) ∆H = +46.6 kJ.

According to the reaction above, 23.3 kJ of energy is needed (absorbed) to react 1 mole of CO₂ with H₂. The reaction given is:

2CO₂(g) + 5H₂(g) --> C₂H₂(g) + 4H₂O(g)

2 moles of CO₂ reacts with 5H₂. So, the amount of energy absorbed for this reaction is 23.3 kJ doubled (46.6 kJ). The enthalpy is written as a positive value if the energy is absorbed.

Hence, the complete thermochemical equation is as follows:

2CO₂(g) + 5H₂(g) --> C₂H₂(g) + 4H₂O(g) ∆H = +46.6 kJ

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The pressure of the NH3 gas is 2.19 atm, a sample of 4.30 moles of NH3 gas occupies 6.50 L at 45°C.

Gas pressure is the force per unit area exerted by a gas on the walls of its container. It is a measure of the number of gas molecules colliding with the container's walls per unit of time, and is proportional to the number of gas molecules and their kinetic energy. It is a result of the gas molecules moving randomly in all directions and colliding with the walls of the container. When a gas is confined in a container, its pressure is exerted equally in all directions. The pressure is a scalar quantity, which means it has only magnitude and does not have a direction.

Gas pressure can be measured in a variety of units, including atmospheres (atm), torr, pascals (Pa), and pounds per square inch (psi). The most commonly used units for measuring gas pressure are atmospheres and pascals.

To calculate the pressure of a gas, the Ideal Gas Law is used which states that [tex]PV = nRT[/tex], where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

First step:  Convert the temperature from Celsius to Kelvin:

45°C + 273.15 = 318.15 [tex]K[/tex]

Second step:Plug in the values and solve for P:

[tex]P = (nRT) / V[/tex]

[tex]P = (4.30 moles * 0.0821 Latm/molK * 318.15 K) / 6.50 L[/tex]

[tex]P = 2.19 atm[/tex]

So, the pressure of the [tex]NH3[/tex] gas is 2.19 [tex]atm[/tex].

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Answer:

Explanation:

Ionic solids and molecular solids have distinct differences in their physical properties due to the nature of their constituent particles.

Ionic solids are composed of positively and negatively charged ions, held together by strong electrostatic forces. They are typically hard and brittle, with high melting and boiling points. Ionic solids are poor conductors of electricity in the solid state, but they are good conductors in the molten state or in aqueous solution.

An example of an ionic solid is sodium chloride (NaCl), which is a white crystalline solid with a high melting point of 801 °C.

Molecular solids, on the other hand, are composed of neutral molecules held together by weak intermolecular forces such as van der Waals forces or hydrogen bonds. They tend to be soft and have low melting and boiling points. Molecular solids are poor conductors of electricity in both the solid and liquid state.

An example of a molecular solid is iodine (I2), which is a black crystalline solid with a low melting point of 114.5 °C.

In summary, ionic solids are characterized by their high melting and boiling points, brittleness, and poor electrical conductivity in the solid state, while molecular solids are characterized by their low melting and boiling points, softness, and poor electrical conductivity in both the solid and liquid state.

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Except the Peroxyacetyl Nitrate (PAN), all other options like Amonia,Sulfur dioxide, Hydrogen sulfide are primary pollutants. Thus, the correct choice for answer of this problem is option (B).

Primary pollutants: Primary pollutants are the injected into the atmosphere directly. For examples are carbon monoxide, CO, nitrogen oxide, NO, and sulfur oxide. In the following provide options , A. Ammonia C. Sulfur dioxide and D. Hydrogen sulfide are primary pollutants. But Peroxyacetyl Nitrate PAN is not a Primary pollutant. Since it form in the atmosphere after the emission of primary pollutants. It is an oxidant that is more stable than Oxone. Sources of the pollutants required to create PANs include motor vehicles, tobacco smoke, and the burning of fossil fuels. It is an secondary pollutant present in photochemical smog. Hence, the Peroxyacetyl Nitrate (PAN) is correct answer.

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Viscosity is a measure of a fluid's resistance to flow. Plotting viscosity on semi-log coordinates allows for the examination of exponential relationships.

On a semi-log plot of viscosity versus temperature, the slope of the line indicates the activation energy for the viscous flow, and a straight line indicates an Arrhenius relationship.

For water, the viscosity decreases with increasing temperature and does not follow an Arrhenius relationship. Hexane also has a decreasing viscosity with temperature, but deviates significantly from an Arrhenius relationship. On the other hand, 100% glycerol has a relatively constant viscosity with temperature, and is an example of a fluid that follows an Arrhenius relationship.

In general, the viscosity of fluids depends on several factors such as molecular weight, intermolecular forces, and temperature. The deviation from an Arrhenius relationship can indicate more complex relationships between viscosity and temperature, such as the existence of multiple temperature-dependent processes that contribute to the overall viscosity of the fluid.

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g(t)=-2.3t² +3.5t; The value of g(8.6) is -140.008. Two expressions that are set equal to one another in a mathematical statement are the definition of an algebraic equation.

To simplify a phrase, create an equivalent expression without any terms that are identical. The expression will then be rewritten using the fewest terms feasible.

Applying the concepts of necessity and proportionality strictly is a requirement for simplifying legislation. The practise entails eliminating outmoded laws and regulations as well as codifying, recasting, and consolidating legislation.

Given;

g(t) = -2.3t^2+3.5t

Substitute t =8.6

g(t) = -2.3(8.6)^2+3.5(8.6)

g(t) = -170.108+30.1

g(t) = -140.008

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Based on the moles of iron given, the mass of iron that participated in the chemical reaction is 4.48 g.

The mass of iron that took part in the reaction is determined from the molar mass and the moles of iron that took part in the reaction.

The moles of iron that took part in the reaction = 0.08 moles

The molar mass of iron = 56 g/mol

The formula below gives the relationship between, moles, molar mass, and mass of an element.

Mass = number of moles * molar mass

The mass of iron = 0.08 moles * 56 g/mol

The mass of iron = 4.48 g

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Total 14.4 g of carbons are required produce 18.5 moles of methane, CH₄

C + 2H₂ ==> CH₄

molar mass, C = 12 g / mol

molar mass, H = 1 g / mol

molar mass, CH₄ = 12 + 4 = 16 g / mol

So,1.2 mol CH₄ x 1 mole C / mol CH₄ x 12 g C / mol C = 14.4 g C

A substance's molar mass is the mass that contains one mole of the substance. Simply put, it is the weight of one substance mole. Each substance's atomic mass is multiplied by the subscript of that element in the chemical formula to determine its molar mass.

An element's atomic mass expressed as g/mol is its characteristic molar mass. However, the atomic mass in amu can also be multiplied by the molar mass constant (1 g/mol) to obtain the molar mass. Add up all of the atomic masses of the individual atoms in a compound to get its molar mass.

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Lines on a temperature map connecting points of equal temperature are called "isotherms."

Isomers are molecules that have the same molecular formula but differ in their arrangement of atoms. This means that they have the same number and type of atoms, but their atoms are arranged differently. As a result, isomers have different physical and chemical properties, even though they are composed of the same elements.

There are several types of isomers, including:

Structural isomers: Also known as constitutional isomers, these are molecules with the same molecular formula but different connectivity of their atoms.

Stereoisomers: These are isomers that have the same molecular formula and the same connectivity of their atoms, but differ in the three-dimensional arrangement of their atoms in space.

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The pressure of the tire at -10°C would be 220.64 kPa.

According to the pressure law, the pressure exerted by molecules of gases is directly proportional to the absolute temperature of the gases.

This is mathematically expressed as: P1/T1 = P2/T2

Where P1 and P2 are the initial and final pressure and T1 and T2 are the initial and final temperature of the gas.

In this case, P1 = 250 kPa, T1 =  25°C or 298K, and T2 = -10°C or 263K

P2 = P1 x T2/T1 = 250 x 263/298

                         = 220.64 kPa

In other words, the new pressure of the tire would be 220.64 kPa.

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The kinetic energy of a cart weighing 100kg moving at a speed of 6 m/s is 1800 J.

Kinetic energy is defined as the energy that an object has because of its motion. If you want to accelerate an object, then you must apply a force. Force can be applied when work is done by us. After work has been done, the energy will get transferred to the object, and the object will be moving with a new constant speed.

Formula for kinetic energy is given as,

K.E = 1/2 mv²

m = 100 kg

v = 6 m/s

Substituting the values we get,

K.E = 1/2 × 100 × 6 × 6

⇒ K.E = 1800 J

Hence, The kinetic energy of a 100kg cart moving at a speed of 6 m/s is 1800 J.

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Combining coal with purified oxygen can make it burn cleaner and reduce carbon dioxide emissions.

This process is known as oxygen-enhanced combustion or oxygen-fired combustion. In this process, the purified oxygen is introduced into the combustion chamber to increase the combustion efficiency, thereby reducing the carbon dioxide emissions. However, the other fossil fuels such as natural gas, liquid petroleum gas and oil cannot be made to burn cleaner with purified oxygen as they are already primarily composed of hydrocarbons and do not require oxygen to combust.

Combining purified oxygen with a fossil fuel like coal can lead to cleaner burning and reduced carbon dioxide emissions. This process is known as oxygen enrichment or oxygen-enhanced combustion. During oxygen enrichment, the proportion of oxygen in the combustion air is increased to around 30-35%, allowing for a more complete combustion of the coal.

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15864x and 15865x correctly represents isotopes of x,  is the symbol of an element, which pair correctly represents isotopes

Isotopes of an element have the same number of protons but a different number of neutrons, giving them a different atomic mass. The correct representation of isotopes of an element would have the same number of protons (represented by the atomic number) but a different number of neutrons, leading to a different atomic mass. In this case, 15864x and 15865x have the same atomic number (represented by the first part of the symbol, "158"), but a different number of neutrons, indicated by the second part of the symbol ("64" and "65"). This means they are isotopes of the same element.

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A candy bar has a food calorie count of 5.78.

The heat capacity is 8.72 kilocalories per degree, and 1 food calorie or his 1 nutritional calorie equals 1 kilocalorie. equation:

c=[tex]\frac{e}{dt}[/tex]

c = 8.72

Delta t is the change in temperature, reported as 16.7 degrees Celsius. so solve

e=145.624 kcal

We know that 1 kilocalorie equals 1 food calorie, so 145 equals 145,624 food calories. Now you have to divide this by the grams of chocolate or candy bar. This was 25.2 grams. 5.78. Remember you need to round up. This is food calories per gram.  

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Answer: 1.90834 X 10 ^ 24

Explanation:

Molar mass Na2SO4 = 23x2+ 32+16X4

= 142g/mol

Mass of Na2SO4 = 450g

Moles of Na2SO4 = mass/ molar mass

= 450g/142g/mol = 3.170 mol

Avogadro's number = 6.02X 10 ^ 23/mol

Number of molecules = moles X avogadro's number

= 3.17 X 6.02X 10^ 23 = 1.90834 X 10 ^ 24 molecules

Therefore the number of molecules of Na2SO4 is1.90834 X 10 ^ 24

Polymers are formed by linking monomers together through condensation reactions

Are monomers joined together by condensation?

Monomers are linked together by a type of reaction called a dehydration or condensation reaction. In this type of reaction, a water molecule is lost and a bond is formed between the two monomers.

How are polymers formed?

Monomers join together to make polymer chains by forming covalent bonds—that is, by sharing electrons. Other bonds then hold the groups of chains together to form a polymer material.

What happens in a condensation reaction?

Condensation reaction: A reaction in which two or more molecules combine to form a larger molecule, with the simultaneous loss of a small molecule such as water or methanol. While this occurs in many reactions, the term is usually reserved for reactions in which a new carbon-carbon bond is formed.

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A necessary trait of a good hypothesis is that it is clear and testable.

The correct option is option 2.

A hypothesis is a theory put up to explain a phenomenon.

A hypothesis must be testable according to the scientific method for it to be considered a scientific hypothesis. Scientific hypotheses are typically based on prior observations that cannot be adequately explained by the current body of knowledge.

An important trait of a good hypothesis is that it must be clear and testable.

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The ion that alcohol and sedatives/hypnotics increase the permeability of and shut off neurons firing is Cl - .

Neurons are the cells that make up the nervous system. To send information across the neurological system, neurons use electricity. And that electricity is produced by the difference in charges between the interior and outside of the cell.

Alcohol and sedatives/hypnotics increase the permeability of chloride ions (Cl-) in the neurons, which can reduce their activity and lead to sedation and hypnosis. This mechanism helps to explain why these substances have a relaxing and calming effect on the central nervous system.

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Since a pure liquid freezes at a constant temperature, a flat, horizontal zone is anticipated on the cooling curve. if the liquid is allowed to cool until it is completely frozen.

The temperature will then continue to drop as the solid cools, eventually reaching the bath's temperature.

When a liquid is cooled in a constant-temperature bath, a cooling curve for the liquid illustrates graphically how the temperature changes over time. To preserve temperature uniformity, the liquid is enclosed in a test tube and continually swirled. Two elements dominate in determining the pace of cooling. The temperature differential between the liquid and the bath is the first. As the liquid temperature approaches the bath temperature as a result of this factor, the cooling curve gradually becomes less steep (has a lower negative slope), finally approaching zero, and producing a horizontal line at the bath temperature.

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70 g of a solid solute is added to 50 g of water at 20 °c, and it all dissolves. when additional solute is added, it does not dissolve. KI is the solute.

What is solute ?

A solute is a substance that has dissolved in a solution. Molecules of the solvent often outnumber those of the solute in a fluid solution. In our daily lives, salt and water are two of the most prevalent solutes. Salt becomes a solute when it is dissolved in water.

What is solvent?

Solvents are employed to dissolve the substances that serve as the formulation's solutes. The components of these solutes can be solids, liquids, or gases. The use of a suitable solvent in conjunction with the solute is required to create a solution.

given: 70g of solute is added to 50g of water at 20degree C

solution: at 20degree C,

since graph is for 100g of water

multiple by 2

2 x 50g of water=100g of water

similarly 2 x 70g of solute= 140g of solute

at 20degree C, The solute KI falls at 140g

Therefore , KI is the solute

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If the mother is Rh negative and her child is Rh positive she will form antibodies that may kill her second child

Found in the bone marrow

The Rh protein but not the A or the B proteins

Mothers must be aware of the rhesus factor in order to prevent a potentially serious condition called Rh incompatibility. The rhesus factor, also known as the Rh factor, is a protein that is found on the surface of red blood cells.

If a woman who is Rh-negative (does not have the Rh factor) becomes pregnant with a fetus who is Rh-positive (does have the Rh factor), there is a risk that the mother's immune system will recognize the Rh factor on the fetus's red blood cells as a foreign substance and produce antibodies against it.

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The total pressure in the apparatus be less than atm.

How do you find partial pressure in atm?

The partial pressure of a gas in a mixture of gases is the pressure that the gas would exert if it were present alone in a container at the same temperature and volume. The partial pressure of a gas in a mixture of gases can be found by dividing its mole fraction by the total pressure of the gas mixture. For example, if a gas mixture has a total pressure of 1 atm and the mole fraction of the gas in question is 0.4, then the partial pressure of the gas is 0.4 atm.

The volume of the container for each gas will rise when the valve is opened. Both of the gases' pressures will drop in accordance with Boyle's law. As a result, the pressure of the gas coming from valves 1 and 2 will fall, resulting in a lower than atm overall pressure in the apparatus.

Therefore,  less than atm is the correct answer.

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According to the balanced chemical equation, there are 2 moles of silver and potassium cyanide produced.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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Water auto-ionization equilibrium shifts to the reactant side as [H3O+] falls and [OH-] grows.

Equilibrium in a process is a state in which the observable properties such as color, temperature, pressure, concentration, and so on do not change.

The word equilibrium means 'balance,' implying that a chemical reaction represents a balance between the reactants and products involved. The equilibrium state can also be observed in certain physical processes, such as the melting point of ice at 0°C, where both ice and water are present.

The equilibrium associated with physical processes, such as solid melting or salt dissolution in water, is known as physical equilibrium, whereas the equilibrium associated with chemical reactions is known as a chemical equilibrium. In a reversible reaction, the chemical equilibrium is the state in which both.

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The complete question is:

What will happen if I add a substance that dissociates to provide many hydroxide ions, such as a strong base, into pure water? (Select all that apply)

[H3O+] decreases

the equilibrium of water auto-ionization shifts to the reactant side

[OH-] increases

The theoretical yield of MgO is 0.84 g. The limiting reactant or limiting reagent is a reactant in a chemical reaction.

The limiting reactant or limiting reagent is a reactant in a chemical reaction that determines the amount of product that is formed. Identification of the limiting reactant makes it possible to calculate the theoretical yield of a reaction.

The reason there is a limiting reactant is that elements and compounds react according to the mole ratio between them in a balanced chemical equation.

Mg is limiting reagent so amount of MgO depends on the amount of Mg.

Mg  +  O₂ [tex]\rightarrow[/tex] 2 MgO

1 mol                        2 mol

Molar mass of Mg = 24 g/mol

Molar mass of MgO = 24 + 16 = 40 g/mol

24 g of Mg gives 80 g of MgO

mass of Mg for trial 1

Mass of Mg = mass of Mg metal, crucible and lid - mass of empty crucible and lid

Mass of Mg = 26.931 g - 26.679 g

Mass of Mg = 0.252 g

24 g of Mg ≅ 80 g of MgO

0.252 g of Mg ≅ X g of MgO

X g of MgO = 0.84 g

theoretical yield of MgO=0.84 g

Therefore, the theoretical yield of MgO is 0.84 g.

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The equilibrium will shift to the reaction's side where there are less gas molecules as pressure increases.

The balance would then change, moving in the direction of increased pressure. This would be in the direction of the reactants, which contain more moles of the gas. As a result, the equilibrium would change and move to the left in favor of the reactants. Pressure increases cause the equilibrium position to shift to the side with the fewest molecules. Because the pressure lowers as the number of molecules decreases, the impacts of the change are lessened. Due to the forced closer proximity of the gas particles when the pressure on a gas increases, the volume of the gas decreases. On the other hand, because the gas particles may now move further apart when the pressure on a gas lowers, the gas volume rises.

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The moles would be 12 moles, 4 moles and 11.34 moles

When hydrogen gas (H2) reacts with oxygen gas (O2) to produce water (H2O), the balanced chemical equation is:

2H2 + O2 -> 2H2O

So,

For every 6 moles of H2, 12 moles of H2O will be produced

For every 2 moles of H2, 4 moles of H2O will be produced

For every 5.67 moles of H2, 11.34 moles of H2O will be produced.

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Answer: Iron is necessary for photosynthesis because it facilitates the transfer of electrons and protons within the chloroplasts, which is required for the production of ATP, which is energy.

Explanation: Biology class helped a lot with this answer.

The isotope work sheet can be filled from the atomic numbers and the mass numbers of the isotopes.

An isotope worksheet is used to track and organize information about different isotopes of a given element. To fill an isotope worksheet, the following information should typically be included:

Element symbol: The symbol of the element being studied.

Atomic number: The number of protons in the nucleus of the atom.

Mass number: The total number of protons and neutrons in the nucleus of the atom.

Isotope: A unique identifier for each isotope, typically written as element symbol, mass number.

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