Which of the following substances is formed from the remains of plants and animals?

A. Natural gas B. Petroleum C. Coal D. Water gas E. all except

−C≡N is the classic low spin ligand.

What is Ligand?

The Latin root of the term "ligand" means "to tie or bind." Anions, cations, and neutral substances can all function as ligands. Lewis bases are ligands that provide electron pairs, whereas Lewis acids are central metal atoms (electron pair acceptor). Covalent and ionic bonds are two different types of bonding that can exist between a metal and its ligand.

On rare occasions, ligands can be electron-pair acceptors and cations (NO+, N2H5+). Examples of neutral ligands include NH3, H2O, NO, and CO, whereas anionic ligands include F-, Cl-, Br-, I-, S2-, CN-, NCS-, and OH-.

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When X rays of wavelength 0.090 nm are diffracted by a metallic crystal, the angle of first-order diffraction (n = 1) is measured to be 15.2. The distance between layers in an NaCl crystal is 282pm.

What is wavelength?

A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles. This length is typically defined in wireless systems in metres (m), centimetres (cm), or millimetres (mm) (mm).

The wavelength, which will also apply to troughs, is the separation between two wave crests. The frequency is measured in cycles per second (Hz), which is the quantity of vibrations that cross a specific area in a second (Hertz).

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When X rays of wavelength 0.090 nm are diffracted by a metallic crystal, the angle of first-order diffraction (n = 1) is measured to be 15.2. The distance between layers in an NaCl crystal is 282pm.

Wavelength is a measure of the distance between two consecutive peaks or troughs in a wave. It is usually represented by the Greek letter lambda (λ) and is measured in the SI unit of meters. Wavelength is an important parameter in many fields, including physics, acoustics, optics, and astronomy. In physics, the wavelength of a wave is related to its frequency, period, and energy. In optics, it is used to describe the properties of light, and in astronomy it is used to describe the properties of radio waves and other forms of electromagnetic radiation. Wavelength is also used to calculate the angular size of an object and its distance from Earth. Wavelength is an important concept in understanding the behavior of light and sound, and their interactions with matter.

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Answer:

proton

Explanation:

Atoms are composed of a nucleus, containing protons and neutrons, surrounded by a cloud of electrons. The number of protons in the nucleus determines the identity of the atom

The enthalpy of the reaction is then obtained as 71.5 kJ/mol.

We know that the enthalpy of the reaction has to do with the amount of heat that is absorbed or lost in the reaction. In this case, we can see that our task is to obtain the enthalpy of the dissolution reaction.

Number of moles of the calcium chloride =  37.73 g/110.98 g/mol

= 0.34 moles

Mass of the water = 240.00 g

Heat gained by the water = mcdT

m = mass of the water

c = heat capacity of  the water

dT = Temperature change

Then;

H = 240.00 *  4.18 * 24.25

H = 24.3 kJ

Enthalpy of the reaction = -( 24.3 kJ)/0.34 moles

= 71.5 kJ/mol

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Radioactive hydrogen during photosynthesis It was recycled into glucose .The correct "option is C"

Photosynthesis is the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

Therefore during this process hydrogen is combined with carbon dioxide to make glucose.

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There are so many types of chemical reaction reaction like combination reaction, double displacement reaction, nucleophilic substitution reaction etc. Therefore, the reaction is nucleophilic substitution reaction. The product formed is 1-bromo-2-methyl-2-phenylethane.

One nucleophile substitutes another in a family of organic reactions known as nucleophilic substitution reactions.

The characteristics of SN1 mechanism:

SN1 stands for nucleophilic substitution reaction.

Leaving group, a nucleophile, electrophile and a solvent are present

Because a link is being severed, the first step is the most laborious.

In the given reaction, firstly H⁺ will attack OH to make good leaving group, then generation of carbocation will take place. Thereafter Br⁻ will attack the carbocation forming C-Br bond. The product formed is 1-bromo-2-methyl-2-phenylethane.

Therefore, the reaction is nucleophilic substitution reaction. The product formed is 1-bromo-2-methyl-2-phenylethane.

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50.5 * 104 grams of the liquid sample are still present in the container at a temperature of 260 K, per the provided data.

The equilibrium pressure between molecules moving from a liquid into a gaseous phase & molecules moving from a gaseous phase into a liquid phase in a closed container is known as the vapour pressure of a liquid.

Pentane's liquid vapor pressure equals 100 mmHg or 13.33 KPa.

T = 260 K, the temperature

Container volume = 370 mL = 0.00037 m3mol

moles of liquid pentane = n

universal gas constant = R = 8.314 J/(mol·K)

Thus From the ideal gas equation PV = nRT →

Thus plugging in the values in the above equation we have

n = = 2.16×10⁻³ moles = 2.28*10³ moles

Hence the number of moles in 0.206 g sample of liquid pentane C₅H₁₂ with molar mass = 72.15 g/mol = 0.206/72.15 = 2.86*10⁻³ moles

Hence the number of moles present in the sample placed in the closed evacuated container = 2.86*10⁻³ moles

However number of moles to completely evaporate at 100 mmHg and 260 K is 2.16×10⁻³ moles hence, 2.86×10⁻³ moles - 2.16×10⁻³ moles, or 0.7 ×10⁻⁴ moles will be left in the container

converting the value in moles to mass we have number of moles, n = mass/(molar mass)

Therefore the mass = number of moles × molar mass = 0.7×10⁻⁴ * 72.15 = 50.5 * 10⁻∧4 grams left in the container

The liquid pentane C5H12 vapor pressure, or 100 mm Hg, will be the pressure inside the container at equilibrium.

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The force of repulsion between the positive charges has a magnitude of 230 N. Option B

We know that the Coulomb's law deals with the way that two charges are able to interact. The interaction between the two charges could be such that the charges are attracted to each other or the charges are repelled from each other.

The forces of attraction and repulsion are the bases of the Coulomb's law. According to the Coulomb's law, the forces of attraction or repulsion between two charges would depend on the product of the magnitudes of the charges and inversely proportional to the distance that separates the charges.

Hence;

F = K[tex]q_{1}[/tex][tex]q_{2}[/tex]/r^2

F = Coulomb's force

[tex]q_{1}[/tex]and [tex]q_{2}[/tex] = magnitude of the charges

r = distance of separation

Then;

F =  8.99 × 10^9 * (1.6 × 10^−19)^2/(1 * 10^-16)^2

F = 2.3 * 10^3 N

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Answer:

Here you go

Explanation:

1. No, her conclusion is incorrect. pH is a logarithmic scale, which means that a difference of 1 pH unit corresponds to a 10-fold difference in acidity. Therefore, a difference of 3 pH units corresponds to a 1000-fold difference in acidity, not 10,000. So soda is generally 1000 times more acidic than water.

2.The pressure of the balloon would need to decrease in order for the volume to increase to three times the size. This is due to the fact that air inside the balloon is a gas, and its volume is inversely proportional to the pressure of the gas. Therefore, a decrease in pressure would result in an increase in volume.

Answer:Many nocturnal animals have a mirror-like layer, called the tapetum, behind the retina, which helps them make the most of small amounts of light.

Explanation:

A proposed method of producing methanol 5.58J heat must be added or removed from the whole system.

What is methanol  ?

Having the chemical formula CH3OH, methanol is a liquid (often abbreviated MeOH). It has no color and is toxic, combustible, volatile, and unstable. The main building blocks for the synthesis of methanol are carbon monoxide and hydrogen, and it is produced by destructively distilling wood.

What is heat  ?

Heat is the result of the movement of kinetic energy from one substance or item to another, or from an energy source to a substance or object. Radiation, conduction, and convection are three different ways that this energy might be transferred.

Therefore, a proposed method of producing methanol 5.58J heat must be added or removed from the whole system.

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Answer:

64.38g

Explanation:

Mass no. of Na is 23 and mass no. of Cl atom is 35. Total is 58. 1 mole of NaCl is 58g. 1.11 moles of NaCl is 1.11x58=64.38g.

Answer:5.63 atm

Explanation: Dalton's Law states that total pressure of a mixture of gasses is equal to the sum of partial pressure of each gas.

[tex]P_{tot} = P_{1} +P_{2}+ P_{3}...[/tex]

We are given pressure O2 and pressure Cl2.

Step 1: First, convert 3040mmHg to atm by dividing by 760.

[tex]\frac{3040mmHg}{760atm} = 4 atm[/tex]

Step 2: Plug your numbers into the equation

[tex]P_{tot} = P_{O2} +P_{Cl2}[/tex]

[tex]P_{tot} = 4atm + 1.63 atm = 5.63 atm[/tex]

Answer:

Total charge would be 0

Explanation:

Atom A will lose 2 outer electrons to atom B. So atom A will be come [A]2+ while atom B will become [B]2-. The total charge of the compound AB will be 0.

If atom A loses electrons to atom B, what will be the total charge of the compound formed is zero.

Charge often refers to electric charge in chemistry and physics, which is a conserved feature of some subatomic particles that governs their electromagnetic interaction. An electromagnetic field exerts a force on matter as a result of the physical attribute of charge. Positive or negative charges can exist in an electric field.

The matter is regarded as neutral or uncharged if there is no negative electric charge present. Similar charges repel one another, such as two positive or negative charges. Positive and negative charges that are incompatible are drawn to one another. To atom B, atom A will give two outer electrons. As a result, atom A will change into A²⁺ and atom B into B²⁻. The chemical AB will have a total charge of zero.

Therefore,  if atom A loses electrons to atom B, what will be the total charge of the compound formed is zero.

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1) Let us assume 100.0 grams of solution. Therefore:

37 g is HCI

63 g is H2O

2) Calculate molality:

moles HCI = 37 g/ 36.5 g / mol = 1.014 mol

kg of water = 0.063 kg

molality = 1.014 mol / 0.063 kg = 16.09 molal

1) Determine moles of HCI in 100.0 g of 37% solution:

37 g of this solution is HCI

37 g / 36.5 g / mol = 1.014 mol

2) Determine volume of 100.0 g of solution:

density = mass / volume

1.19 g / mL = 100g / x

x = 84.03 mL

3) Determine molarity:

1.014 mol / 0.084 L = 12.07 M

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The volume of oxygen gas from mercuric oxide  at STP from ideal gas equation is 123.54 liters.

The ideal gas equation is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.

Substituting the given values in ideal gas equation, V=mass×RT/molar mass×P=10.38×8.314×298/216.59×1=123.54 L.

Thus, the volume of oxygen gas at STP is 123.54 L.

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The number of moles occupied by a gas at 347.8 mL is 6.21 × 10-³moles.

The number of moles occupied by a gas can be calculated using the ideal gas equation formula as follows:

PV = nRT

Where;

According to this question, the following parameters are given:

0.4369 × 0.3478 = n × 0.0821 × 298

0.1519 = 24.47n

n = 6.21 × 10-³moles

Therefore, 6.21 × 10-³moles is the number of moles of the gas.

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Given Reaction:

FeSO4(aq) + Zn (s)--> Fe (s ) + ZnSO4 (aq)

In above reaction, SO4-2(aq) is a spectator ion. Hence the net ionic equation for above reaction is given by-

Fe+2 (aq) + Zn (s)    -->  Fe (s) + Zn+2 (aq)    

In the net ionic equation, the oxidation state of Zn changes from " 0" to " + 2 ". Therefore, the oxidation half reaction is

Zn (s) --> Zn+2 (aq) + 2e-  (oxidation by releasing elections)

The oxidation state of Fe changes from ‘+2’ to ‘0’. Therefore, reduction half reaction:

Fe+2 (aq) + 2e- -->Fe (s)  (Reduction by accepting elections)

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Use an oxidising chemical to give the metal an oxide covering.

Paint or another nonporous covering should be applied to the metal.

what is passivation?

In physical chemistry and engineering, passivation is the process of covering a material to make it "passive," or less susceptible to environmental corrosive effects. Passivation is the process of forming an outer layer of shield material that is either applied as a microcoating, produced chemically through reactivity with the base material, or allowed to develop naturally through airborne spontaneous oxidation. Passivation, as a technique, is the application of a thin layer of a corrosion-resistant substance, such as metal oxide.When making microelectronic devices, silicon is passively coated.

Many metals naturally develop a hard, comparatively inert surface layer when exposed to air. This layer, known as the "native oxide layer" or the "passivation layer," is typically an oxide or a nitride.

In the case of silver, the dark tarnish is a layer of silver sulphide that has formed by passivation as a result of reactivity with ambient hydrogen sulphide. (In contrast, metals like iron easily oxidise to generate a rough, porous covering of rust that attaches slackly and peels off easily, permitting further oxidation.)

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The venom of a snake, the horns of cattle, the wax-producing glands of bees, and the bright plumage of birds all are physical adaptations that increase an organism's chances of physically defending itself.

Physical adaptations do develop over many generations. The shape of a bird's beak, the thickness or thinness of the fur, and the shape of the nose or ears are examples of physical adaptations.

Adaptation can be described as a characteristic that provides defense for an animal to survive in its habitat. All animals should be able to get food and water, protect themselves from harm, and climate, and reproduce young species.

Horns and antlers can be used to protect themselves, fight for territory, or to attract a mate. The leaves are coated in the wax which reduces water loss and stops the plant from drying out. Some butterflies and birds have bright, vivid colors that provide them stand out from their surroundings and serve as a warning to predators.

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Helium expands most when the temperature is increased.

For a given rise in temperature, gasses expand much more and faster than liquids. This is due to the fact that gasses have more interatomic or intermolecular space than liquids. Among the given, helium is a gas while the rest are liquids: Helium expands more than the rest.

What is temperature?

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In the given question, the moles of hydrogen that can be obtained from the reaction is 4.75 moles.

The reaction of zinc with hydrochloric acid can be written as:

                              Zn + 2HCl ⇒ ZnCl₂  + H₂

This reaction is a displacement reaction, in which zinc displaces hydrogen from hydrochloric acid. Hydrogen is released from HCl and hydrogen gas appears at the end of the reaction.

It can be seen that 1 mole of zinc combines with 2 moles of HCl to produce 1 mole of hydrogen gas. If 4.75 moles of zinc is combined with an excess amount of HCl, then it will produce 4.75 moles of H₂.

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Meeting cycle due dates is not one of the three types of liquidity in terms of meeting cash needs in production cycles

The process of turning raw resources into completed goods is referred to as the manufacturing cycle. The cycle consists of numerous independent parts, including product design, scheduling of production, manufacturing tasks, & a cost accounting feedback process. The production cycle of a business reveals how well it can turn assets into earnings, inventories into goods, & supply - chain into cash flow.

The product design, planning and scheduling, production operations, and cost accounting are the four fundamental steps in the production cycle.

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Answer:

Water, H20 is a molecule made of oxygen and hydrogen. The bonds that hold water molecules together are due to shared electrons and known as Covalent bonds. In contrast, the bonds that hold NaCl molecule together are Ionic bonds, arising from charge difference between the atoms

Answer:

there is no picture. please add it so i can see :)

Explanation:

A type of fossil fuel,known as Tar stands.

A fossil fuel is a hydrocarbon-containing material formed naturally in to  the Earth's crust from to the  remains of dead plants and animals and birds that is the  extracted and burned as thr  a fuel. The main fossil  fuels are mainly coal, oil, and natural gas.

Tar sands are a combination of clay, sand, water and bitumen, which is a heavy hydrocarbon. Like the  kerogen in oil shale, tar sands' bitumen can be upgraded to synthetic crude oil.

So answer is tar sands.

These include tar sands – deposits of moist sand and it is  clay with 1-2 percent  bitumen (thick and heavy are  petroleum rich in the  carbon and poor in the  hydrogen). These are the  removed by strip mining in the  (see section below on coal)

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Answer:

d. Valence electrons are found in the nucleus.

Explanation:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom.

The other 3 statements are correct.