Ca reacts with element X to form an ionic compound with the formula CaX. Al will react with X to form ________.

1) Overall redox-reaction:

\(Hg + 2HNO_3 -- > Hg_2^+ + N_2O + 3H_2O\)

Oxidation numbers:

In Hg: The oxidation number of Hg changes from 0 to +2.

In HNO₃: The oxidation number of N changes from +5 to +2, and the oxidation number of O changes from -2 to 0.

2) Overall redox-reaction:

\(2Fe_3^+ + I_2 -- > 2Fe_2^+ + 2I^-\)

Oxidation numbers:

In Fe₃⁺: The oxidation number of Fe changes from +3 to +2.

In I₂: The oxidation number of I changes from 0 to -1.

3) Overall redox-reaction:

\(5Fe_2^+ + MnO_4^- + 8H^+ -- > 5Fe_3^+ + Mn_2^+ + 4H_2O\)

Oxidation numbers:

In Fe₂⁺: The oxidation number of Fe changes from +2 to +3.

In MnO₄⁻: The oxidation number of Mn changes from +7 to +2, and the oxidation number of O changes from -2 to -2.

1) Mercury reacts with nitric acid to mercury(II)-ions, nitrogen monoxide, and water.

Partial reaction equations:

Oxidation half-reaction (Ox): \(Hg -- > Hg_2^+ + 2e^-\)

Reduction half-reaction (Red): \(2HNO_3 + 2e^- -- > N_2O + 3H_2O\)

Overall redox-reaction:

\(Hg + 2HNO_3 -- > Hg_2^+ + N_2O + 3H_2O\)

Oxidation numbers:

In Hg: The oxidation number of Hg changes from 0 to +2.

In HNO₃: The oxidation number of N changes from +5 to +2, and the oxidation number of O changes from -2 to 0.

2) Iron(III)-ions react with iodine to iodide and iron(II)-ions.

Partial reaction equations:

Oxidation half-reaction (Ox): \(Fe_3^+ -- > Fe_2^+ + e^-\)

Reduction half-reaction (Red): \(I_2 + 2e^- -- > 2I^-\)

Overall redox-reaction:

\(2Fe_3^+ + I_2 -- > 2Fe_2^+ + 2I^-\)

Oxidation numbers:

In Fe3+: The oxidation number of Fe changes from +3 to +2.

In I2: The oxidation number of I changes from 0 to -1.

3) In the presence of sulfuric acid, potassium permanganate reacts with iron(II)-sulfate to potassium sulfate, manganese(II)-sulfate, iron(III)-sulfate, and water.

Partial reaction equations:

Oxidation half-reaction (Ox): \(Fe_2^+ - > Fe_3^+ + e^-\)

Reduction half-reaction (Red): \(MnO_4^- + 8H^+ + 5e^- -- > Mn_2^+ + 4H_2O\)

Overall redox-reaction:

\(5Fe_2^+ + MnO_4^- + 8H^+ -- > 5Fe_3^+ + Mn_2^+ + 4H_2O\)

Oxidation numbers:

In Fe₂⁺: The oxidation number of Fe changes from +2 to +3.

In MnO₄⁻: The oxidation number of Mn changes from +7 to +2, and the oxidation number of O changes from -2 to -2.

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Answer:

Regions of the Electromagnetic Spectrum

Wavelength (m)Frequency (Hz)Radio> 1 x 10-1< 3 x 109Microwave1 x 10-3 - 1 x 10-13 x 109 - 3 x 1011Infrared7 x 10-7 - 1 x 10-33 x 1011 - 4 x 1014Optical4 x 10-7 - 7 x 10-74 x 1014 - 7.5 x 1014

Counting electrons

When drawing molecules, an important first step is to first count the total valence electrons (electrons in the outer shell) in the molecule. Sulfur has 6 valence electrons, each oxygen has 6 valence electrons, and the 2- charge indicates there are 2 additional electrons. This comes out to be a total of 32 electrons.

Drawing the molecule

The next step is to draw the general shape of the molecule. In this case, sulfur is the central atom and 4 oxygens surround it, so draw a sulfur atom labelled as S with 4 oxygens equally spaced around it.

Next, you want to fill in the bonds between each oxygen to the sulfur atom. This will be a total of 4 bonds.

Now, count the number of electrons used. 4 bonds consisting of 2 shared electrons each is 8 electrons. We have 24 electrons left.

Add these remaining 24 electrons to the surrounding oxygens in pairs of 2, making sure that no atom has more than 8 electrons around it (1 bond and 3 pairs).

This is one possible structure of SO4 2-, but it is not the most common one.

Formal charge of each atom in a molecule is calculated by taking the normal amount of valence electrons, in sulfur for example, 6, and subtracting it by the total amount of non-bonding electrons and the amount of bonds. In this case in the structure we just drew above, the formal charge is 6-4=2, where 4 is the amount of bonds to sulfur.

FC=V−N−B/2

this is the equation for formal charge. V is the valence electrons of the atom in its ground state, or when it is not bonded to anything else. N is the number of non-bonding, or loose, electrons around the atom in the molecule. B is the number of electrons that are in bonds.

All atoms in a molecule want to have a formal charge as close to zero as possible, and this is a rare case where sulfur can be an exception to the octet rule and have more than 8 valence electron in order to satisfy this need.

Therefore, in this case, 2 of the single bonds around sulfur can be replaced by double bonds, so that the formal charge is 6-6=0. So, for two of the oxygens, remove one pair of electrons and turn them into bonds with sulfur.

There are several different places you can add these double bonds, which lead to structures called resonant structures. Resonant structures have the same number of non bonding electrons and bonds, but the single and double bonds are in different places.

The attached image is just one resonant structure, but keep in mind there are other possible very similar structures-- for example, the double bonds could be opposite of each other.

These structures are more common as they have the lowest formal charge on the central atom, sulfur.

momentum = mass x velocity

When know that:

momentum is 12 km m/s

Mass is 6 kg

Hence, velocity = 12/ 6 = 2m/s

Answer:

is there supposed to be a photo with this?

Explanation:

35.6 liters of space will a 70.0 grams sample of CO2 occupy.

Molar mass is defined as the mass of a given substance divided by the amount of that substance, expressed in grams per mol.

To calculate a molecule's molecular mass, multiply the subscript by the atomic mass of each element in the molecule, then add the masses of all the elements in the molecule.

The molar mass of carbon dioxide is 44.01 g/mol.

The volume of a mole of ideal gas at STP is 22.4 L,

Therefore,  the volume of 70.0 g = ?

= (70.0g) / (44.01 g/mol) (22.4 L/mol)

= 35.6 L

Thus, 35.6 liters of space will a 70.0 grams sample of CO2 occupy.

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The gravitational potential energy for the object is  9800 J.

The gravitational potential is the scalar amount characteristic of a point in a gravitational field whose slope breaks even with the escalated of the field and rises to the work required to move a body of unit mass from a given point to a point interminably farther.

The formula referred  for calculating the gravitational  potential to the ground level is given by

        U = mgh

where m  is the mass of the object and g is the gravitational constant and last h is the height from the ground where the object is situated.

As we provided with,

g = 9.8 ms-2

m = 200 kg  

h = 5m

So substituting the required values in the formula m we get  

=  200 x 9.8 x 5

=  9800 J

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Answer:

Chemistry Secondary School answered Mg (OH)₂ + HCl→ MgCl₂ + H₂O balance it Answer 5.0 /5 6 Diabolical Answer: The answer will be; = Mg (OH)₂ + 2 HCl → MgCl₂ + 2 H₂O That's all. Find Chemistry textbook solutions? Class 12 Class 11 Class 10 Class 9 Class 8 Class 7 Class 6 Preeti Gupta - All In One Chemistry 11 3080 solutions

Entropy measures the disorder in a system, hence, option C is the correct answer.

Entropy is a thermodynamic characteristic that measures the degree of disorder or unpredictability in a system. It is a measure of the number of alternative energy distributions among a system's constituent particles or components, with each distribution corresponding to a different state of the system.

Entropy, in other terms, is a measure of the system's microstates, which are the many configurations of particles or components with the same macroscopic attributes.

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The use of biomass energy is not encouraged because of its high 'suspended particulate matter' (SPM) emissions.

Biomass energy is a non-conventional source of energy that is produced from organic materials such as wood, agricultural waste, and even household garbage. Although this source of energy is renewable, its high 'suspended particulate matter' (SPM) emissions have led to concerns regarding its impact on the environment and public health. These emissions can cause respiratory problems and contribute to air pollution, which is why the use of biomass energy is not encouraged.

The combustion of biomass releases a large amount of particulate matter, which consists of tiny particles suspended in the air. These particles can be inhaled and cause lung damage and other health issues. The use of other non-conventional sources of energy, such as wind and solar, is encouraged because they have minimal environmental impact and do not produce SPM emissions.

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1) The required mass of iron III oxide is 2.1 Kg

2) The empirical formula of aluminum oxide is  \(Al_{2} O\).

3) The mass of lithium chloride required is 27.7 g

4) The mass of carbon dioxide produced is 186.6 g

We have to note that we can only be able to obtain the parameters that has to  do with an equation when we can be able to use the stoichiometry of the reaction and this depends on the equation of the reaction.

1) Number of moles of iron =  1.50 * 10^3 g/ 56 g/mol

= 26.8 moles

If 2 mole of iron III oxide produces 4 moles of iron

x moles of  iron III oxide produces  26.8 moles of iron

x = 13.4 moles

Mass of the iron III oxide = 13.4 moles * 160 g/mol

= 2.1 Kg

2) Number of moles of Al = 2.91 g/27 g/mol

= 0.11 moles

Number of moles of oxygen = ( 5.50  -  2.91 )/32 g/mol

= 0.06 moles

Dividing through by the lowest ratio, the empirical formula is \(Al_{2} O\).

3) Number of moles of lead II acetate = 106 g/325 g/mol

= 0.33 moles

If 1 mole of  lead II acetate reacts with 2 moles of lithium chloride

0.33 moles would react with 0.33 * 2/1

= 0.66 moles of lithium chloride

Mass of the the lithium chloride = 0.66 moles * 42 g/mol

= 27.7 g

4) Number of moles of octane =  60.3 g/114 g/mol

= 0.53 moles

2 moles of octane produces 16 moles of carbon dioxide

0.53 moles  of octane produces 0.53 * 16/2

= 4.24 moles

Mass of carbon dioxide = 4.24 moles * 44 g/mol

= 186.6 g/mol

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Answer:

Q = -4903.14 j

Explanation:

Given data:

Mass of water = 23 g

Initial temperature = 78°C

Final temperature = 27°C

Heat lost = ?

Solution:

Specific heat capacity of water is 4.18 J/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT =  27°C - 78°C

ΔT = -51°C

Q = 23 g × 4.18 J/g.°C  × -51°C

Q = -4903.14 j (negative sign shows heat is released)

Answer:

molecular formula of liquid = C₈H₁₈

Explanation:

First we determine the empirical formula of the liquid:

Number of moles of each element present in the liquid = % mass / molar mass

For Carbon, (molar mass = 12.01 g/mol) : 84.2/12.01 =7.011 moles

For Hydrogen (molar mass = 1.01 g/mol) : 15.8/1.01 = 15.643

Simplest mole ratio of the elements, C : H  is given by:

C = 7.011/7.011 = 1.0

H = 15.643/7.011 = 2.23

Multiplying through with 5, C:H = 5:11

Therefore, empirical formula is C₅H₁₁

The molecular mass of the liquid is next determined:

Using PV = nRT to find the number of moles of the liquid present

P = 5.0 atm; V = 568.0 mL = 0.568 L; R = 0.082 L*atmmol⁻¹ K⁻¹; T = 273 + 120 = 393 K

n = PV/RT = (5*0.568)/0.082*393

n = 0.088 moles

Molar mass of liquid = mass/no of moles = 10.0 g/ 0.088 moles = 113.63 gmol⁻¹

Molecular formula = n(empirical formula)

Molar mass of empirical formula, C₅H₁₁ = 71 gmol⁻¹

n = molecular mass/empirical mass = 113.63/71 = 1.6

Therefore, molecular formula =  1.6*(C₅H₁₁) = C₈H₁₈

Pure science deals with the process of discovering new scientific facts through carefully controlled scientific experiments while applied science deals with the use of scientific knowledge to solve problems in society.  Efforts to make quinine cheaper and more accessible is an example of applied science.

The scientific efforts that are concentrated on making new facts available is known as pure science. Efforts such as discovery of new elements is an example of pure science.

The scientific efforts that are concentrated on applying scientific knowledge in solving new problems in the world is an example of applied science.

Efforts to make quinine cheaper and more accessible is an example of applied science.

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Answer:

Control your weight. Reduce the risk of disease. Stay in shape etc.

Explanation:

Bases interact through hydrogen bonds to form a double strand of DNA from two single strands of DNA.

On the two opposing strands of the DNA double helix are molecules called nucleotides that interact chemically. The two strands of DNA are held together by these chemical bonds, which function like rungs on a ladder. DNA contains the bases adenine (A), cytosine (C), guanine (G), and thymine (T) (T).

Adenine forms chemical bonds with thymine while cytosine forms chemical bonds with guanine to join the two strands together.

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Answer:

Ca2+ represents an ion with 20 protons and 18 electrons.

Explanation:

A calcium atom has 20 protons and 20 electrons. The 2+ charge next to the symbol indicates a loss of two electrons: 20-2=18.

The process of transferring a metal such as copper or silver from one surface to another using electric current is called electroplating. It involves the use of an electric current to reduce the cations of a desired metal in a solution and coat a conductive object with a thin layer of the metal.

Electroplating is a process that involves the use of an electrolytic cell, which is a device that converts electrical energy into chemical energy. The cell consists of two electrodes, the anode and the cathode, which are submerged in an electrolytic solution. The anode is made of the metal to be plated, while the cathode is the object that will receive the plating.

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Answer:

By making sense of the World around them

Explanation:

maybe?

It is true that according to Hubble's law, the farther away a galaxy is, the faster it is moving away from us.

It is true that the formation of a star occurs when nuclear fusion begins to fuse light elements into heavier ones;

The distance to the nearest stars can be determined by parallax, the apparent shift of a start against background stars observed as the earth moves along its orbit. (Option B)

Based on the accompanying H-R Diagram, the type of start that has the greatest temperature is the blue giants (Option C)

Two hydrogen atoms come together in a nuclear fusion reaction to produce Helium Gas. (Option A).

Hubble's law, which essentially states that the velocity of a galaxy (or, as it is commonly plotted, its redshift) is precisely proportionate to its distance, also reveals crucial information about the condition of the universe. There should be no relationship between distance and velocity if the cosmos is static and unchanging.

Hubble's law is the physical cosmology observation that galaxies move away from Earth at a rate proportionate to their distance. In other words, the farther they are from Earth, the quicker they are travelling away.

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Answer:

A. Gametes are formed by meiosis and are haploid, while body cells are formed by mitosis and are diploid.

Explanation:

Meiosis is a type of cell division that produces four haploid daughter cells (gametes) from one cell, while mitosis produces two diploid daughter cells (i.e., somatic cells). In both cases, the DNA is replicated during interphase of the cell cycle

The electricity used in the Miller-Urey experiment simulated lightning strikes and was intended to simulate the conditions that existed on early Earth before the presence of life. The experiment was done by Stanley Miller and Harold Urey.

The experiment was conducted by Stanley Miller and Harold Urey in the 1950s and aimed to demonstrate how simple organic compounds could be synthesized from inorganic precursors under conditions thought to exist on early Earth.

The results of the experiment showed that after a week of continuous electrical discharge, a variety of simple organic compounds, including amino acids, were produced. This provided evidence that life could have arisen through natural processes.

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Substances that behave in this way are said to be thixotropic. Thixotropic materials form suspensions that separate into solid like mixtures and water, but the solid like mixture can flow like a liquid when stirring or agitation.

Conjugation is the process of exchanging genetic material by creating a bridge, according to one definition. This is a specific form of horizontal gene transfer method.

The process of conjugation depends on cell-to-cell interaction. Since stirring or agitation makes it easier for cells to come into contact with one another, the conjugation process is more effective in liquid media. Less possibility of conjugation occurs when cells are cultured on agar plates.

When a substance is being dissolved in a solvent, stirring the solution will speed up the process. This is due to the fact that stirring a solution exposes more of the solute's surface area to the solvent, increasing the solute and solvent interaction. The rate at which the solute dissolves increases with the amount of solute exposed to the solvent.

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Answer:

0.5 moles of CO2 will react with 0.708 moles of H2O.

Explanation:

\(\sf balanced \ equation = 3CO2 + 4H2O \rightarrow C3H8 + 5O2\)

using molar ratio:

4H2O : 3CO2

4 : 3

so H2O moles:

\(\sf\dfrac{0.708}{4} *3\)

\(\sf 0.531\) moles of CO2

Answer:

The 5R's are Reuse, Reduce, Recycle, Repair and Recover.

Energy is released by plants through photosynthesis, which is the process of converting light energy from the sun into chemical energy stored in the bonds of glucose molecules.

Molecules are collections of two or more atoms held together by chemical bonds. They can range from the very small, such as oxygen and carbon dioxide, to the very large, such as proteins and DNA. Molecules are the fundamental building blocks of all matter.

Energy is released by plants through photosynthesis, which is the process of converting light energy from the sun into chemical energy stored in the bonds of glucose molecules. During photosynthesis, plants use carbon dioxide and water to make glucose and oxygen, with light energy as the catalyst. The glucose molecules are then broken down in the mitochondria of cells to release energy in the form of ATP.

In photosynthesis, light energy is converted into chemical energy. Light energy is absorbed by special molecules called pigments, which are located in the plant’s chloroplasts. This energy is then used to break apart the bonds of carbon dioxide and water molecules, which are used to create glucose and oxygen molecules.

When a plant needs energy, the glucose molecules are broken down inside the cell’s mitochondria. This process, called cellular respiration, releases energy in the form of ATP molecules. This energy is then used to power processes like growth, reproduction, and cell repair.

In summary, plants release energy by converting light energy into chemical energy in the form of glucose molecules. These molecules are then broken down in the mitochondria of cells to release energy in the form of ATP, which is used to power the processes that keep plants alive.

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Answer: Thus X is Plutonium

Explanation:

Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.

General representation of alpha decay :

\(_{Z}^{A}\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\textrm{He}\)

where Z = atomic number

A= mass number

X and Y = atomic symbol of elements

\(_{Z}^{A}\textrm{X}\rightarrow _{92}^{235}\textrm{U}+_2^4\textrm{He}\)

Thus \(_{94}^{239}\textrm{Pu}\rightarrow _{92}^{235}\textrm{U}+_2^4\textrm{He}\)

Thus X is Plutonium with atomic number 94 and mass number 239

Answer:

the answer is D on edge

Explanation:

According to the research, the correct option is remove. An air-to-air heat pump removes heat from the outside air and deposits it in the conditioned space.

It is characterized by being a thermal machine or a device based on thermodynamics that, through an absorption process, takes heat from one place and transfers it to another, that is, it extracts heat from a cold source to a hot one.

An air-to-air heat pump starts by sucking in outside air or recovers heat from outside and transfers it to a higher temperature level in the ambient air, raising the temperature of the room, being adjustable to adapt to the heating needs of  the conditioned space.

Therefore, we can conclude that according to the research, the correct option is remove. An air-to-air heat pump removes heat from the outside air and deposits it in the conditioned space..

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The elementary reactions in the given set are: \(2 NO(g) + 2 H_2(g)\) → \(N_2(g) + 2 H_2O(g)\), \(2 NO(g) + O_2(g)\) → \(2 NO_2(g), NO_2(g) + CO(g)\)→ \(CO_2(g) + NO(g)\).

Elementary reactions are individual reactions that cannot be further broken down into simpler steps. In the given set, the first reaction involving the combination of 2 NO molecules with\(2 H_2\) molecules to form \(N_2\) and \(2 H_2O\) satisfies the definition of an elementary reaction.

Similarly, the second reaction where 2 NO molecules react with \(O_2\) to produce 2 \(NO_2\) also qualifies as an elementary reaction. Finally, the third reaction where\(NO_2\) reacts with CO to yield \(CO_2\)and NO is another example of an elementary reaction. These reactions directly involve the reactant molecules without any intermediates or multiple steps.

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The product of di-bromination of camphor under the given conditions is 2,2-dibromocamphor.

Camphor is a bicyclic ketone with a ketone functional group and two fused rings. Di-bromination refers to the introduction of two bromine atoms into the camphor molecule.

The reaction likely proceeds through an electrophilic aromatic substitution mechanism, where bromine acts as the electrophile. One bromine atom substitutes a hydrogen atom on the camphor ring, and the second bromine atom substitutes another hydrogen atom on the same ring.

The high yield of 99% indicates the efficiency of the reaction and the selectivity in producing only the desired product. The product, 2,2-dibromocamphor, is a white crystalline solid. Its molecular formula is C10H14Br2O, and it possesses two bromine atoms attached to the camphor skeleton.

This dibrominated product can find applications in organic synthesis, as a starting material for further reactions, or as a precursor in the synthesis of pharmaceuticals, agrochemicals, or fragrances.

The complete question must be:

The dibromination of camphor under the conditions shown gave a single product in 99% yield. What is this product?

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