what is rusting of iron?​

These next statements are true because of the Bohr model of the hydrogen atom:

These statements are true because of the Bohr model of the hydrogen atom. The Bohr model describes the way the electrons move in a hydrogen atom. This model shows that electrons are arranged in shells around the nucleus. Each shell corresponds to a specific energy level, and each energy level has a fixed circular orbit of the electron around the nucleus. When the electron is in the orbit closest to the nucleus, it has its lowest energy state.

When the electron absorbs a photon with energy equal to the new energy state, it moves to a higher energy state. Only certain energy levels are allowed within the hydrogen atom because electrons can only exist in specific energy levels.

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The answer is-  142.27 food calories are in the taco.

Heat capacity-The amount of energy needed to increase the temperature of a substance by one degree Celsius.

How heat released or gained is related to heat capacity?

\(q = m* C*\)Δ\(T\)

Where m is the mass of substance.

C is the heat capacity

and Δ\(T\) is the change in temperature.

\(Heat\ = (22.8 ^{0}\ C) * (31.2 kJ/ ^{0}\ C) = 711.36\ kJ\)

1 kJ = 0.2 food calories

Thus, the food calories in the taco are-

\(Food\ Calories\ in\ taco = (711.36\ kJ) * (0.2 Food\ calories/ kJ) = 142.27\ calories\)

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer:

The reaction rate is equal in both directions.

Explanation:

Equilibrium means equal.. so... you get the point.

Answer: the reaction rate is equal in both directions is the answer

Explanation:

hope this helps

Answer:

because mariah carey wrote it

Explanation:

she also made a song out of it!

A pigment that ran exactly with the solvent front would have no polarity and be the most non-polar of the pigments.

The process of chromatography is used to separate chloroplast pigments. It is a laboratory technique that involves separating a mixture into its individual components. The mixture is dissolved in a mobile phase, which is usually a liquid or gas, and is then passed through a stationary phase. The solvent used to separate chloroplast pigments has two polar groups. This means that it is polar in nature and can dissolve other polar substances.

As the solvent moves through the stationary phase, the individual pigments in the mixture are separated based on their polarity. The pigment that runs exactly with the solvent front would have no polarity and would be the most non-polar of the pigments. This is because it has the least attraction to the polar solvent. The other pigments, which are more polar, would be retained on the stationary phase and would not move as far as the non-polar pigment.

Therefore, the more polar the pigment, the less it will move with the solvent front.

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Habitat degradation: 25%, Exploitation: 50%, Invasive species and disease: 25%, Pollution: 25%, Climate change: 50%, Birds: 25%, Reptiles and amphibians: 25%, Mammals: 25% and Fish: 25%

Biodiversity is being threatened by many impacts from human activities. These include climate change, habitat destruction, over-exploitation of resources, pollution, and introduction of invasive species.

Climate change affects biodiversity by changing the physical and chemical environment, altering weather patterns, and increasing the frequency and intensity of extreme weather events. This can lead to a decrease in species diversity, as some species may not be able to survive in the new environment. Habitat destruction is another major factor in biodiversity loss, as it removes habitats that are necessary for species to survive and reproduce.

Over-exploitation of resources can lead to over-harvesting of animals and plants, removing an important source of food or shelter. Pollution can be toxic to species and can also disrupt the food chain. Finally, the introduction of invasive species can out-compete native species, leading to their decline.

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To compare the theoretical efficiencies of a steam engine operating between 20°C and the boiling point of water at different pressures, we need to calculate the Carnot efficiency for each case.

The Carnot efficiency is given by the formula:

Efficiency = 1 - (Tc/Th)

where Tc is the temperature of the cold reservoir and Th is the temperature of the hot reservoir.

Case 1: Boiling point of water at 1 atm

The boiling point of water at 1 atm is 100°C.

Efficiency = 1 - (20/100) = 0.8 or 80%

Case 2: Boiling point of water at 25 atm

The boiling point of water at 25 atm is given as 223°C.

Efficiency = 1 - (20/223) ≈ 0.910 or 91.0%

Comparing the efficiencies, we can see that the theoretical efficiency of the steam engine operating between 20°C and the boiling point of water at 25 atm is higher (91.0%) than that between 20°C and the boiling point of water at 1 atm (80%). This is because a higher temperature difference between the hot and cold reservoirs leads to a higher Carnot efficiency.

It's important to note that these calculations represent the idealized theoretical efficiencies based on the Carnot cycle and do not take into account real-world losses and inefficiencies in steam engine systems.

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Answer:

b

Explanation:

Answer: They are all odorless, colorless, monatomic gases with very low chemical reactivity.

Explanation: Plz give brainliest

Answer: Colds are caused by viruses and are easy to treat. They are usually caused by germs too.

Explanation:

Answer:

Answer: Colds are caused by viruses and are easy to treat. They are usually caused by germs too.v

Explanation:

Answer:

Flavors and fragrances

Answer:

HCIO4+KOH=KCIO4+H2O IS H2OHYFR

Answer: Fe3(PO4)2

Explanation:

If this helps give me brainliest please

The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon is True.

A natural source of regenerated cellulose, such as wood and other associated agricultural products, is used to create rayon, a semi-synthetic material. Its molecules resemble those of cellulose. Viscose is another name for it. Viscose fibres and films come in a wide variety of types and grades. Some mimic the appearance and feel of organic materials including silk, wool, cotton, and linen. Artificial silk is a common name for the materials that resemble silk.

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Complete Question

The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.

True

False

Answer:

As sodium and potassium both are alkali metals that belong to Group IA of the periodic table. They have one valence electron in their valence shell. As we move from top to bottom, the reactivity of metallic elements of Group IA increases.

Answer:

invalid

Explanation:

Just imagine doing this experiment MULTIPLE TIMES and one of the trials you get 72 Kcal while in another u get 12kcal. It doesn't make sense. Somewhere in the experiment she went wrong. So its invalid

Answer:

A mole is the quantity of a substance that is equal to Avogadro's constant.   The 1.993 moles contain   atoms of sulfur.

Mole :

It is the amount of substance that contains as many elementary entities as in 12 g of Carbon-12. It is equal to the atoms, molecules, or ions.

As mentioned above,

1 mole =

Number of mole formula,

Hence it can conclude that the 1.993 moles contain   atoms of sulfur.

Answer:

it's thermal energy

Explanation:

There are five types of kinetic energy: radiant, thermal, sound, electrical and mechanical.

#carry on learning

Hope it helps

In this exercise we have to use the knowledge of kinetic energy and we can also describe it as a thermal energy.

Kinetic energy is a type of energy that is related to the movement of bodies. The result of kinetic energy is intrinsically linked to the value of the object's mass and its speed of movement.

Kinetic energy does not depend exclusively on the speed of a body but also on its mass. Any type of body in motion is endowed with this type of energy: translation, rotation, vibration and others.

With these definitions we can write that it will be the same as saying that kinetic energy can be transformed into thermal energy.

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Answer:

C 1:1

Explanation:

Hydrogen loses an electron to becone +1 which is a cation and flourine gains that electron to have a full outer shell on the 2p subshell to become -1 and is an anion so the ratio is 1:1.

Answer:

1.2353 mol

Explanation:

First, let's visualize the structure of 1,1,4-trifluorohept-2-yne. This indicates that there is fluor in carbon 1 twice and in carbon 4, there is a triple bond in carbon 2 because of the "2-yne" (yne is telling us that is a triple bond) and the principal chain has seven carbons (hept). Remember that carbon is bonded fourth times:

You can see that we have 7 carbon atoms, 9 hydrogen atoms, and 3 fluorine atoms.

Answer:

The heavier the molecules, the slower they move - the lighter the molecules, the faster they move. Nitrogen molecules weigh about 28 units. Chlorine molecules weigh 71 units. So we would expect nitrogen to diffuse more quickly than chlorine.

Answer:

Nitrogen weights 28 units and chlorine is 71 units . In that case nitrogen will diffuse faster

Combustion and displacement reaction are the types of given chemical reaction. In a chemical reaction, the atoms that make up the reactants.

Chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products).

Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.

C\(_4\)H\(_{10}\) + O\(_2\) → CO\(_2\) + H\(_2\)O

oxygen is not balanced so balanced it

2C\(_4\)H\(_{10}\) + 13O\(_2\) → 8CO\(_2\) + 10H\(_2\)O, this is a combustion reaction.

Fe + CuNO\(_3\) →Fe(NO\(_3\))\(_2\)+Cu

The number of nitrogen atom on left side is 1 while on product side is 2

Fe + 2CuNO\(_3\) →Fe(NO\(_3\))\(_2\)+2Cu

This a displacement reaction.

Therefore, combustion and displacement reaction are the types of given chemical reaction.

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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:

6

Explanation:

The coordination number of the metal atom in the [Fe(NCS)(H2O)5]2+ complex is 6.

This means that there are six surrounding atoms or molecules (five water molecules and one NCS ligand) directly bonded to the central iron (Fe) atom in the complex.

Hope it helps!!

The coordination number of the metal atom in the [Fe(NCS)(H2O)5]2+ complex is six.

Coordination number is the total number of neighbors (atoms or ions) that a central atom has in a coordination compound or a complex. Coordination compounds are chemical species that have a central metal ion bonded to a set of molecules or ions, known as ligands.

                       These ligands are capable of donating a pair of electrons to the central metal ion and thus, form coordinate covalent bonds.Coordination number of metal ion in [Fe(NCS)(H2O)5]2+ complex:In the given coordination compound, Fe(II) is the central metal ion that is coordinated with five water molecules and one NCS– anion ligand.

Thus, the total number of coordinate covalent bonds formed between Fe(II) and its ligands is 6.Therefore, the coordination number of the metal atom in the [Fe(NCS)(H2O)5]2+ complex is six.

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The value of Ksp for lead chloride (PbCl2) at 298 K based on the given experiment, we can use the Nernst equation. The Nernst equation relates the cell potential to the (K) for the redox reaction occurring in the cell.

The Nernst equation is given by:

Ecell = E°cell - (RT/nF) * ln(Q),

where E°cell is the standard cell potential, R is the gas constant (8.314 J/(mol·K)), T is the temperature in Kelvin, n is the number of electrons transferred in the redox reaction, F is Faraday's constant (96,485 C/mol), and Q is the reaction quotient.

In this case, the redox reaction can be represented as:

\(PbCl_2\)(s) ⇌ \(Pb^2^+\)(aq) + \(2Cl^-\)(aq).

The reaction quotient (Q) for this equation is given by:

Q = \([Pb^2^+][Cl^-]^2\),

where\([Pb^2^+]\) represents the concentration of \(Pb^2^+\) ions and \([Cl^-]\) represents the concentration of \(Cl^-\)ions.

Since the lead nitrate solution is 0.889 M, we can assume that the concentration of \([Pb^2^+]\) ions is 0.889 M in the cathode compartment. In the anode compartment, the solution is saturated with lead chloride, meaning the concentration of \([Pb^2^+]\) and \(Cl^-\) ions are equal.

Now, let's substitute the values into the Nernst equation:

5.04×10-2 V = E°cell - (0.0257 V) * \(ln([Pb^2^+][Cl^-]^2)\).

Since we are interested in the value of Ksp for PbCl2, which represents the equilibrium constant for the dissolution of the solid \(PbCl_2\), we can set the cell potential (Ecell) to zero when equilibrium is reached. Therefore:

0 = E°cell - (0.0257 V) * \(ln([Pb^2^+][Cl^-]^2)\).

Rearranging the equation:

E°cell = (0.0257 V) * \(ln([Pb^2^+][Cl^-]^2)\)

Now we can solve for Ksp by substituting the known values:

Ksp = \([Pb^2^+][Cl^-]^2\) = e^(E°cell / (0.0257 V)).

Calculating the numerical value:

Ksp = \([Pb^2^+][Cl^-]^2\) = e^(0.0257 V / (0.0257 V)).

Ksp = \([Pb^2^+][Cl^-]^2\) = e^1 = 2.71828.

Therefore, the value of Ksp for lead chloride \((PbCl_2)\) at 298 K, based on this experiment, is approximately 2.71828.

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Answer:

1.) plastics are poor conductors of heat and electricity

2.) plastics are non reactive metals they are not attacked by chemicals

3.) plastics are lightweight strong and durable

4.) plastics can be moulded and dyed easily in many colours like orange, pink ,sky blue , red, green, and e.t.c

the four uses of plastics are:

1.) bakelite is used to make electric switches insulating casings and handle of cookware and tools

2.) melamine is heat resistant and is used to make kitchenware , floor tiles and special suits for firefighters

3.) Teflon is used as a non stick coating on cookware as both water and oil do not stick to it

4.) many plastics are waterproof and therefore

they are used to make Water bottles and waterproof containers

Explanation:

Search it up bro :')

The four properties of plastics are malleability, longevity, cheapness, and poor conductivity.

Plastics are generally very malleable and can be molded into different shapes very easily. Different types of plastics have different melting points, which enables them to be shaped into different shapes and make objects.

Plastics are generally very durable and have a long shelf life. That is the reason why plastics are used to make things that go through a lot of wear and tear. A negative aspect of this is that plastics, when exposed to natural processes of degradation, do not break down easily and harm the environment.

Plastics are usually cheap and can be obtained at a very less price. This helps people afford goods made out of plastic and also reduces the production cost of the goods.

Plastics are generally very poor conductors of heat and electricity. This means that they do not conduct heat and electricity very well, which is why they are used as insulators and wire coverings.

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Answer:

thermal decomposition