addition of which of the following reactants would lead to the formation of more hydrogen gas? magnesium chloride magnesium water hydrochloric acid

The water molecule interacts with various types of solutes to dissolve them , the water dissolves the ionic and the polar molecules but do not dissolves the non - polar molecules.

The water is called as universal solvent.  the polar molecule and the ionic molecule have the partial positive and the negative charges. the water molecule also have partial positive and the negative partial so they will attract and dissolve in water. Non - polar molecules do not have positive and negative charges therefore they will not attracted to water and do not dissolve in water.

Thus, The water molecule interacts with various types of solutes to dissolve them , the water dissolves the ionic and the polar molecules but do not dissolves the non - polar molecules.

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Answer:

D

Explanation:

chemical composition doesn’t change with physical change like freezing water will still make it h2o

Hopes this helps please mark brainliest

The equipment that is  necessary for finding the volume of a regular solid is a graduated cylinder

A graduated cylinder is used to measure the volume of a solid by water displacement

The volume of water displaced will be equal to the volume of the solid to be measured

The graduated cylinders are long slender vessels that are used for measuring volumes and solids.

They are in a variety where there are those made of plastics and those made of glass they are also graduated as they have makings that aid in detecting the used  solution

They also vary in size from the largest to small this is because of the purpose which they are specified  to perform

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When a chemical reaction is reversible, the reactants from the initial reaction are created from the products as soon as they are formed.

There is no net change in the amounts of the substances involved because, at equilibrium, the two opposing reactions proceed at equal rates.

When both the conversion of reactants into products and the conversion of products back into reactants take place at the same time, the reaction is said to be reversible. A and B may combine to generate C and D, or in the opposite reaction, C and D may combine to create A and B. In thermodynamics, this is different from a reversible process.

All physical changes that result in a state change can be undone.

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This structure is correct due to the total number of bonds and electrons

We employ the octet rule, which states that all atoms in a compound are expected to follow, to check the accuracy of any chemical structure. The octet rule is precisely satisfied for each atom in the depicted structure of carbon IV oxide. The valence shell of each atom in the molecule is surrounded by eight electrons. We may thus infer that this structure is accurate given the total number of bonds and electrons since CO2 has sixteen valence electrons.

It possesses a negative charge of 1.602176634 coulombs, the basic unit of electric charge, which is comparable to its negative charge. The rest mass of an electron is 9.1093837015 10^-31 kg, or just 1/1,836 the mass of a proton. An electron is therefore considered to have practically negligible mass in comparison to a proton or neutron, and its matter is not taken into consideration when calculating an atom's mass number.

The question is incomplete, the complete question is found in the image attached to this answer

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A 0.425g sample of propane was mixed with excess oxygen in a calorimeter containing 98.72 g of water. The system was ignited and the temperature rose from 18.29ºC to 26.85ºC.  the molar enthalpy of propane is 393851.1 J/mol

The mass of propane = 0.425 g

molar mass of propane = 44 g/mol

moles = mass / molar mass

         = 0.425 / 44

         = 0.009 mol

ΔH = mc ΔT

ΔH  = n ΔHsol

ΔHsol = mc ΔT / n

          = 98.72 × 4.18 ( 26.85 - 18.29 ) / 0.009

molar enthalpy of solution = 393851.1 J/mol

Thus, A 0.425g sample of propane was mixed with excess oxygen in a calorimeter containing 98.72 g of water. The system was ignited and the temperature rose from 18.29ºC to 26.85ºC.  the molar enthalpy of propane is 393851.1 J/mol

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Several units of pH should be reduced.

go beyond the buffer's limit.

In the food, textile, metal, and rubber sectors, hydrochloric acid (HCl) is frequently used to neutralise alkaline chemicals and as a bleaching agent. If discharged into the soil, it is neutralised, and water exposure causes it to hydrolyze quickly.

Raise the pH a little bit.

Reduce the pH a little.

Increase the pH by a few units.

Decrease the pH by a few units.

Do not alter the pH

Exceed the buffer's maximum size

Hydrochloric  acid is created when potassium fluoride and hydrofluoric acid interact. The total of the HFO generated and the KFO consumed equals the amount of HCl supplied. All of the KFO is consumed, exceeding the buffer's capacity and reducing pH by several units, because moles of HCl > moles of KFO.

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The chemical formula of the gas is Xe

Molar mass of H2 (M₂) = 2 g/mol

Rate of diffusion of H2 (r₂) = ?

Rate of diffusion of X (r₁) = 0.124r₂

molar mass of X (M₁) = ?

To calculate the molar mass of X we use graham's law of diffusion

     [tex]\frac{r1}{r2} = \sqrt{\frac{M2}{M1} }[/tex]

    [tex]\frac{0.124r2}{r2} = \sqrt{\frac{2}{M1} }[/tex]

    [tex]{0.124} = \sqrt{\frac{2}{M1} }[/tex]

    0.015 = 2 / M₁

    M₁ = 2 / 0.015

    M₁ = 133.3

133 is near 131.293 g/mol, which is the molar mass of xenon (Xe)

Therefore the chemical formula of the gas HX is Xe.

Complete question:

A gas made up of atoms escapes through a pinhole 0.124 times as fast as H2 gas. write the chemical formula of the gas.

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The frequency in hertz of electromagnetic radiation is 5.70×10^14 Hz.

c = wavelength × frequency

Here , wavelength= 530 nm = 530×10 m/s

Therefore,

3×10 m/s = 530×10 m/s× frequency

= Frequency= (3×10 m/s)÷(530×10 m/s)

= Frequency= 5.70×10^14 s-1

The frequency will be 5.70×10^14 Hz.

The number of periods or cycles per second is called frequency. The SI unit of frequency is hertz. An EMF meter can measure alternating electromagnetic fields normally emitted by man-made sources such as power lines.

Gauss meters or magnetometers, on the other hand, can measure DC fields that occur naturally in the Earth's magnetic field and radiate from other sources where direct current is present. Current. The energy associated with EM radiation is proportional to frequency and inversely proportional to wavelength. Therefore, the shorter the wavelength of the electromagnetic wave, the greater the energy.

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The reaction rate would increase.

In an acidic media, the reaction between potassium iodate and sodium meta-bisulfite produces iodine. Firstly, hydrogen sulfite and iodate ions are formed. Iodide ions are produced as a result of the reaction between iodate ions and hydrogen sulfite ions. Iodine is formed when the excess of iodate ions reacts with iodide ions in the existence of hydrogen ions. Iodine instantly combines with any remaining hydrogen sulfite ions to make iodide ions before it can mix with starch to form a dark blue-colored complex. The iodine is then free to combine with the starch to create the colorful complex after all of the hydrogen sulfite ions have completed their reactions. The color reveals the consumption of the sulfite ions. In order to observe this reaction, a known but constrained amount of sodium meta-bisulfite solution and starch solution can be added. The amount of time it takes for the blue color to develop is used to measure the rate of reaction. Overuse of bisulfite will stop the development of the dark blue complex.

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The gram of nitric acid is 30.82 grams of HNO3.

The molar mass of nitric acid is derived from the atomic mass of the element and its corresponding quantity. Percent Yield is a calculation that compares the amount of product you are actually producing with the amount of product you were calculated to be producing.

Calculation:-

Percentage yield = 76%

mass of NO2 consumed = 45 g

percentage yield = observed/actual ×100

obtained mass = 75× 45÷100

= 135/4

=30.82 gram

All real laboratory reactions always produce slightly less product than calculated. The yield rate measures how close you can get. Theoretical yields are calculated based on the stoichiometry of the chemical formula. Actual yield is determined experimentally. The yield rate is determined by calculating the ratio of actual yield/theoretical yield. Percent yield is a calculated number that indicates the percentage difference between the theoretical yield and the actual yield of the experiment.

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5ml of HCl is needed to convert a 2M molarity solution into a 0.1M solution of HCl that is 100ml in volume.

The HCl solution has a fixed molarity of 2M, and 100ml of a 0.1M molecular-weight solution is required for preparation. It is now necessary to determine the volume that will be required to make the 100ml 0.1M solutions.

M₁V₁  = M₂V₂

It is the dilution formula that should be used to achieve this.

We obtain,

2 x V₁ = 0.1 x 100 by entering the supplied values into the dilution formula.

2V1 = 10 V1

 V₁ = 10/2

V₁  = 5ml

As a result, 5ml of HCl is needed to make 100ml of a 0.1M solution.

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Answer:

help me with my new question its science i got like 2 hrs left fr

Explanation:

The unknown volume to be added is 398.374 mL

Dilution formula

M₁ x V₁ = M₂ x V₂

M₁ = the initial concentration

M₂ = the concentration to be created

V₁ = the required volume

V₂ =  is the volume to be created

Volume units in liters. But, you can also use milliliters or something else, which is important on the left and right.

First, calculate the volume required

M₁ × V₁ = M₂ × V₂

1.75 M × 500 mL = 8.61 M × V₂

V₂ = 101.626 mL

So, the added volume is

500 mL - 101.626 mL = 398.374 mL

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Answer:

Explanation:

#1 (highest): Bovine meat (beef herd)

Beef has the highest carbon footprint of any food. This is because of what is required to raise and farm cattle. Animals used for beef production require a tremendous amount of feed, which must be grown on its own. They also produce an extremely high amount of methane

Answer:

вау, это кажется сложным, но я все равно не знаю

In order to accelerate the cart at a rate of 0.5/s2, the force needed is 37.5 N.

Acceleration is the rate of change of the velocity of an item with appreciation to time. Accelerations are vector portions. The orientation of an item's acceleration is given by the orientation of the net pressure appearing on that object.

Calculation:-

Mass = 75 kg

acceleration = 0.5 m/s²

F = ma

   = 75 × 0.5

  = 37.5 N

Acceleration is the charge at which velocity modifications with time, in terms of each speed and route. A factor or an object moving in a straight line is accelerated if it quickens or slows down. movement on a circle is extended despite the fact that the rate is consistent because the course is continually changing.

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A homogeneous suspension is created by whisking or blending two immiscible liquids, such as oil and water, to create an emulsion.

Depending on how the emulsion is made, the agitation creates either tiny oil droplets or water/vinegar droplets. If the chemical make-up of a combination remains constant throughout, it is said to be homogeneous. The salt water in the sample described above is homogeneous because the dissolved salt is dispersed uniformly throughout the entire salt water sample. A mixture of oil and water is known as an emulsion. A mixture of two separate liquids is referred to as an emulsion.

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Due to the disparity in mass between the two objects, the acceleration of the two objects varies.

Friction is the resistance to a thing moving or rolling over another solid object. Although they can be helpful, frictional forces, such as the traction required to walk without slipping, nevertheless pose a significant amount of resistance to motion.

Acceleration is influenced by mass. The acceleration decreases with increasing mass. A = f/m, or acceleration equals force times mass, is the formula for measuring speed. Due to the increased mass of the cookie plate compared to the milk glass, the acceleration is faster for the milk glass and slower for the cookie plate.

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Answer:

B

Explanation:

because I've just guessed and you've seen this but when you get this wrong and you see you'll wish you put that down

1.63×10^-18J is the energy for the transition of an electron from the level n=1 to the level  n= 2 of a hydrogen atom.

According to the Bohr equation for hydrogen atom,

Energy, ∆E= -RH[(1/nf2 ) - (1/ni2)]

Where RH is the Rydberg constant and its value is 109737.3cm-1, 'nf' and 'ni' are integers that represent the energy levels.

1). ni= 1 and nf= 2, substituting these values in Bohr equation,

∆E = -109737.3cm-1[(1/22). -(1/12)

= -109737.3cm-1[(1/4) -1]

= -109737.3cm-1[0.25-1]

= -109737.3cm-1(-0.75)

= 82302.975cm-1

=82302.975×1.986×10-23J

=1.63×10-18J

(where 1 cm-1= 1.986×10-23J)

Here the electron jumps from n=1 to n=2, so it must absorb a photon of light. Therefore this is an absorption process.

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Electron and molecular geometries, respectively, for hydrogen sulfide H₂S is electron geometry is linear and molecular geometry is bent

Molecular geometry is the three dimensional arrangement of atom that constitute a molecule and there are two lone pair present on the sulfur central atom in the H₂S molecule hence it will contract the bond pair and this make its shape appear like a bent structure and therefore the molecular geometry or shape of H₂S is bent while its electron geometry is tetrahedral because of four electron group around the sulfur

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The question above isn't complete, as there's no reaction being written. That being said, assuming that the reaction is C2H5Br (alc) + OH ‾(alc) → C2H5OH (l) + Br‾(alc), the rate of disappearance of ethyl bromide would get reduced by 4 times or 1/4 of the original rate.

In the following reaction:

C2H5Br (alc) + OH‾ (alc) → C2H5OH (l) + Br‾ (alc)

The ethyl alcohol will dilute the concentration of each reactant to half of the original concentration. There are two reactants in the reaction, so the reaction rate after the addition of ethyl alcohol would be:

  1/2 x 1/2 = 1/4 of the original rate.

In another word, the rate of disappearance of ethyl bromide will get reduced by four times after ethyl alcohol gets added to the solution.

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Decene has a chemical formula of and has 75 isomers. In this example, all alkanes up to ten carbon atoms in length are meticulously listed starting with methane and proceeding in this manner.

A nuclide isomeric with one or more others is one of two or more molecules, radicals, or ions that have the same number of atoms of the same elements but differ in their structural arrangement and characteristics.

The isomers known as structural isomers have the same chemical formulae but have their atoms totally rearranged in a different order. These are molecules with the same type of molecular formula but various connectivities based on the order in which they are assembled.

Carbon chains have the potential to branch, these isomers are created. For instance, the chemical butane, C4H10, has two isomers. One of them has a "straight chain" of carbon atoms, whereas the other has a branched chain.

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The grand formula of mass is 115 grams.

Mass in grams is the atomic mass of one mole of an elemental or molecular or ionic compound. That is, the amount of a compound that has the same gram mass as the formula mass in unit atomic mass is called the gram formula mass. The formula mass of a molecule is the sum of the atomic weights of the atoms in the compound's molecular formula.

Calculation:-

molecular Mass Cu(CN)2= 63 + 2(12 + 14)

115 grams

The formula weight is the sum of the atomic weights of the atoms in the molecular formula of the compound formula. Multiply the atomic mass of each element by the total number of atoms/ions of that element in the formula. Add all the masses to get the form of the connection. The molar mass of a compound defines the mass of one mole of that particular substance and the number of grams per mole of the compound.

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0.15 grams of paint chip contains 0.0394 grams of lead.

Since we working with percentages, let's assume that we start out with 100 grams of paint.

Then, we have 14.5 grams of PbCr2O7, lead (II) dichromate, and 73 grams of the paint evaporates,

leaving us with 27 grams of dried paint, from which we extract our 0.15-gram chip.

The molecular mass of PbCr2O7 is 423.2 grams, and the atomic mass of lead is 207.2 grams, so

18.5 grams of PbCr2O7 contains 207.2 * 14.5 / 423.2  =  7.099 grams of lead.

If a 26.4-gram "chip" of paint contains 7.099 grams of lead, then a 0.15-gram chip should contain

0.15*7.099 / 27  =  0.0394 grams of lead.

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The temperature at which the molecules in a one-gram sample of water would have the lowest average kinetic energy is 5 Kelvin; option 3

The average kinetic energy of the molecules of a substance increases with an increase in temperature.

Thus, the average kinetic energy of the molecules of a substance will be highest at the highest temperature and lowest at the lowest temperature.

Considering the given temperatures of the water molecules, the highest temperature is 5 celsius and the lowest temperature is  5 Kelvin

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Answer: More Energy

Explanation:

Electrons at higher energy levels, which are farther from the nucleus, have more energy. They also have more orbitals and greater possible numbers of electrons. 

Answer:yes it 4

Explanation:

because u can divide