hich of the following is an example of an electrolytic cell? select the correct answer below: alkaline battery non-rechargeable battery lead acid battery electric car battery

Answer:

element

Explanation:

an element is something made up of only one type of atom

According to the chemical formula: Potasium (s) + Br2(g) KBr(s), 383.18 grams of KBr will be created.

Purchase stock geometry starting at 356g of KBR times. A mole of Kbr is equal to 119 g Kbr multiplied by two. Alright, one mole of KCL for two modes of Kbr times 74.55g Casey Albert. Hence, K C L mass. That was too 223 g KCL here.

We must first balance the chemical equation to ascertain the reaction's stoichiometry in order to answer this problem:

2K(s) + Br2(g) → 2KBr(s)

The ideal petrol law can be used to determine how many moles of Br2 are reacted in 35 litres of Br2 at STP: PV = nRT

where P = 1 atm (at STP), V = 35 L, n = ?, R = 0.0821 L·atm/(mol·K), and T = 273 K.

Solving for n, we get:

n = PV/RT = (1 atm)(35 L)/(0.0821 L·atm/(mol·K))(273 K) = 1.61 mol

As a result, 3.22 mol of K and 1.61 mol of Br2 react (since 2 moles of K reacts with 1 mole of Br2). The molar mass of KBr (119 g/mol) can be used to compute the mass of KBr generated.

mass of KBr = (3.22 mol KBr) x (119 g/mol KBr) = 383.18 g

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Explanation:

Iron fillings are magnetic in nature so They get attracted by a magnet.

One is through sublimation, where the mixture is heated and iodine gets converted into gaseous form, leaving behind the iron fillings.

Answer:

Oxides of Nitrogen (NOx)

NOx is a collective term used to refer to two species of oxides of nitrogen: nitric oxide (NO) and nitrogen dioxide (NO2).

Annual mean concentrations of NO2 in urban areas are generally in the range 10-45 ppb (20-90 µgm-3). Levels vary significantly throughout the day, with peaks generally occurring twice daily as a consequence of "rush hour" traffic. Maximum daily and one hourly means can be as high as 200 ppb (400 µgm-3) and 600 ppb (1200 µgm-3) respectively.

Globally, quantities of nitrogen oxides produced naturally (by bacterial and volcanic action and lightning) far outweigh anthropogenic (man-made) emissions. Anthropogenic emissions are mainly due to fossil fuel combustion from both stationary sources, i.e. power generation (21%), and mobile sources, i.e. transport (44%). Other atmospheric contributions come from non-combustion processes, for example nitric acid manufacture, welding processes and the use of explosives.

Sulphur Dioxide (SO2)

SO2 is a colourless gas. It reacts on the surface of a variety of airborne solid particles, is soluble in water and can be oxidised within airborne water droplets.

Annual mean concentrations in most major UK cities are now well below 35 ppb (100 µgm-3) with typical mean values in the range of 5-20 ppb (15-50 µgm-3). Hourly peak values can be 400-750 ppb (1000-2000 µgm-3) on infrequent occasions. Natural background levels are about 2 ppb (5 µgm-3).

The most important sources of SO2 are fossil fuel combustion, smelting, manufacture of sulphuric acid, conversion of wood pulp to paper, incineration of refuse and production of elemental sulphur. Coal burning is the single largest man-made source of SO2 accounting for about 50% of annual global emissions, with oil burning accounting for a further 25-30%.

Carbon Monoxide (CO)

Carbon Monoxide is a colourless, odourless, tasteless gas that is slightly lighter than air.

Natural background levels of CO fall in the range of 10-200 ppb. Levels in urban areas are highly variable, depending upon weather conditions and traffic density. 8-hour mean values are generally less than 10 ppm (12 mgm-3) but have been known to be as high as 500 ppm (600 mgm-3).

CO is an intermediate product through which all carbon species must pass when combusted in oxygen (O2). In the presence of an adequate supply of O2 most CO produced during combustion is immediately oxidised to carbon dioxide (CO2). However, this is not the case in spark ignition engines, especially under idling and deceleration conditions. Thus, the major source of atmospheric CO is the spark ignition combustion engine. Smaller contributions come from processes involving the combustion of organic matter, for example in power stations and waste incineration.

Ozone (O3)

O3 is the tri-atomic form of molecular oxygen. It is a strong oxidising agent, and hence highly reactive.

Background levels of O3 in Europe are usually less than 15 ppb but can be as 100 ppb during summer time photochemical smog episodes. In the UK ozone occurs in higher concentrations during summer than winter, in the south rather than the north and in rural rather than urban areas.

Most O3 in the troposphere (lower atmosphere) is formed indirectly by the action of sunlight on nitrogen dioxide - there are no direct emissions of O3 to the atmosphere. About 10 - 15% of tropospheric O3 is transported from the stratosphere where it is formed by the action of ultraviolet (UV) radiation on O2. In addition to O3, photochemical reactions involving sunlight produce a number of oxidants including peroxyacetyl nitrate (PAN), nitric acid and hydrogen peroxide, as well as secondary aldehydes, formic acid, fine particulates and an array of short lived radicals. As a result of the various reactions that take place, O3 tends to build up downwind of urban centres where most of NOx is emitted from vehicles.

Explanation:

Answer:

When you combine the solid (baking soda) and the liquid (vinegar), the chemical reaction creates a gas called carbon dioxide. Carbon dioxide is invisible, except as the bubbles of gas you may have noticed when the vinegar and baking soda mixture began to fizz.

Explanation:

To solve this problem, we can use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas.

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

Since we are dealing with the same gas (oxygen) at the same temperature and pressure, we can assume that the value of R is constant. Therefore, we can write:

PV/n = RT

The ratio PV/n is known as the molar volume of the gas, and is constant for a given temperature and pressure. We can use this relationship to find the volume of oxygen gas that corresponds to 5.00 g.

First, we need to calculate the number of moles of oxygen gas in 1.9 g:

n = m/M

where m is the mass of the gas and M is the molar mass of oxygen, which is 32 g/mol.

n = 1.9 g / 32 g/mol

n = 0.059375 mol

The molar volume of oxygen gas at the given temperature and pressure is:

PV/n = RT/n

V/n = RT/P

Substituting the given values, we get:

V/n = (0.0821 L·atm/mol·K) x (273 K) / (1 atm)

V/n = 22.414 L/mol

Therefore, the volume of 1.9 g of oxygen gas is:

V1 = n x V/n = 0.059375 mol x 22.414 L/mol = 1.331 L

Now we can use the molar volume to find the volume of 5.00 g of oxygen gas:

n = m/M = 5.00 g / 32 g/mol = 0.15625 mol

V2 = n x V/n = 0.15625 mol x 22.414 L/mol = 3.51 L

Therefore, 5.00 g of oxygen gas will occupy a volume of 3.51 L at the same temperature and pressure as 1.9 g of oxygen gas.

A phase change that occurs at the normal melting point by the addition of very small amounts of heat at constant temperature and pressure will have no effect on the temperature or pressure of the substance.

When a substance is heated at its melting point, the heat energy supplied is used to overcome the intermolecular forces of attraction between the molecules or atoms of the substance. This results in the substance transitioning from the solid state to the liquid state.

At the normal melting point, the temperature of the substance remains constant as long as the phase change is occurring, despite the addition of heat energy. This is because the added heat energy is absorbed by the substance to overcome the intermolecular forces of attraction between the particles rather than increasing its kinetic energy, which would result in a temperature increase.

Therefore, the addition of very small amounts of heat at constant temperature and pressure during a phase change at the normal melting point will have no effect on the temperature or pressure of the substance.

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The molar heat of fusion of X has been 775.6 cal/mol. Thus, option C is correct.

The molar heat of fusion has been defined as the energy absorbed or released by a mole of substance in converting between solid and liquid state.

The given mass of substance X has been, 326 g.

The molar mass of substance X has been 58.45 g/mol.

The moles of sample have been given as:

\(\rm Moles=\dfrac{Mass}{Molar\;mass}\\\\ Moles\;X=\dfrac{326\;g}{58.45\;g/mol}\\\\ Moles\;X=5.58\;mol\)

Thus, the amount of heat absorbed by 5.58 mol of sample has been 4325.8 cal.

The amount of heat absorbed by a mole of sample has been:

\(\rm 5.58\;mol=4325.8\;cal\\\\1\;mol=\dfrac{4325.8\;cal}{5.58\mol} \\\\1\;mol=775.6\;cal/mol\)

The amount of heat absorbed by a mole of sample in meting has been the molar heat of fusion.

Thus, the molar heat of fusion of X has been 775.6 cal/mol. Thus, option C is correct.

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What is meant by isomerism?

➪ Two or more compounds having the same molecular formula but different structures are called isomers and this process is known as isomerism...~

Explanation:

Isomerism is basically denoted to two compounds having same molecular formula but different structures ,functional groups,bonds at different places.

It's of three types

During the breakdown of fatty acids, not all acetyl CoA enters the citric acid cycle, and your body converts some acetyl CoA to ketone bodies.

Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.

Blood is normally slightly alkaline, with a normal pH range of about 7.35 to 7.45. Normally, the body keeps blood pH near 7.40. Doctors measure a person's acid-base balance by measuring the pH of the blood and the levels of carbon dioxide (acid) and bicarbonate (base). No oil is either an acid or a base. Neutral. Oil is a neutral, nonpolar chemical. That is, it is a viscous liquid at room temperature. It is immiscible with water, but soluble in alcohol and ether.

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Answer:

153 N left

Hope this helps

Explanation:

The peak present in the IR spectrum of m-nitrobenzoic acid that is not present in m-nitroacetophenone is the **carboxylic acid peak**.

In the IR spectrum, carboxylic acids exhibit a strong and broad peak in the range of approximately 2500-3300 cm^-1, corresponding to the stretching vibrations of the O-H bond. This peak is absent in m-nitroacetophenone since it lacks the carboxylic acid functional group. However, in m-nitrobenzoic acid, the carboxylic acid group (-COOH) is present, resulting in the characteristic O-H stretching peak. This peak is a distinctive feature that can be used to differentiate between these two compounds in their respective IR spectra.

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Rb and Cl, S and S, C and F, Ba and S, N and P, B and H form bond which is covalent.

Ionic, covalent, polar covalent bonds and the respective reasons:Ionics or ionic bond results due to the attraction between the opposite charges that arise from the transfer of one or more electrons from one element to the other element. Electronegativity difference ≥1.7.The bond formed between Rb and Cl is ionic because Rb (Rubidium) belongs to group 1A with one valence electron and Cl (Chlorine) belongs to group 7A with seven valence electrons. The electronegativity difference between them is 2.0, which is greater than the critical value of 1.7. Hence, RbCl is expected to be ionic.The bond formed between Sulfur and Sulfur is Covalent. It is due to the sharing of electrons between atoms of the same element. Electronegativity difference = 0.The bond formed between Carbon and Fluorine is Polar covalent. Carbon belongs to group 4A, and it has four valence electrons while fluorine belongs to group 7A and has seven valence electrons. The electronegativity difference between Carbon and Fluorine is 1.5. Therefore, the bond between Carbon and Fluorine is polar covalent.The bond formed between Barium and Sulfur is ionic. Ba belongs to group 2A, and S belongs to group 6A. The electronegativity difference between Ba and S is 2.6, which is greater than 1.7. Hence BaS is ionic.The bond formed between Nitrogen and Phosphorous is covalent. The reason is that they both belong to the same group (5A), and the electronegativity difference is also zero.The bond formed between Boron and Hydrogen is covalent. The reason is that B (Boron) belongs to group 3A, and H (Hydrogen) belongs to group 1A. The difference in electronegativity is only 0.9. Hence the bond is covalent.

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Magnesium chloride, often known as MgCl2, can be produced chemically by extracting it from brine or seawater.

Magnesium chloride+ potassium hydroxide (25 ml )------>magnesium hydroxide

Magnesium chloride: what is it?

One magnesium (Mg) and two chloride ions make up magnesium chloride, also known as magnesium dichloride, magnesium (II) chloride, or chloromagnesite (Cl-).

Ionic halides, such as magnesium dichloride and related salts, have the appearance of fine, white to grey granules.

Uses of MgCl2 (Magnesium Chloride)

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Answer:

The atoms present at the beginning of the reaction is equal to the atoms present at the end of the reaction. This is because matter can neither be created nor be destroyed in an ordinary chemical reaction.

Explanation:

During photosynthesis, 6 molecules of water react with 6 molecules of carbon dioxide to form 1 molecule of glucose and 6 molecules of oxygen. The equation for the photosynthesis reaction is

6CO2 + 6H2O --> C6H12O6 + 6O2

At the beginning of the reaction, there is 6 carbon atoms, 18 oxygen atoms and 12 hydrogen atoms while at the end of the reaction, there is 6 carbon atoms, 12 hydrogen atoms and 18 oxygen atoms.  This is because according to the law of conservation of mass and matter, it can neither be created nor be destroyed in an ordinary chemical reaction. The number of atoms present at the beginning of the reaction must be equal to the number of atoms present at the end of the reaction.

Answer:

c. alcohol

it has no substance

Answer:The mass of scheelite having one million oxygen atoms is. Explanation: We are given: Number of oxygen atoms = (million atoms). According to mole .

Explanation:

Electrolysis occur when an electric current is passed through a liquid or solution thereby causing the decomposition of chemicals.

For magnesium chloride, it will be heated to be able to conduct electricity. When molten, the MgCl2 will decomposes into Mg2+ and 2Cl- ions. During electrolysis, the elements are separated according to the equations;

According to the half reactions, the Mg2+ is reduced at the cathode (-) and the Cl- is oxidized at the anode (+). Reduction at the cathode shows that magnesium gains two electrons to form a magnesium solid while the chlorine ion looses two electrons at the anode

Answer:

number of protons and neutrons

Explanation:

The reagent that readily reacts with ethyl methyl ether is option B, concentrated HI (hydroiodic acid).

Ethyl methyl ether (C₂H₅OCH₃) can undergo nucleophilic substitution reactions with strong acids like hydroiodic acid (HI). Concentrated HI is a strong acid that can donate a proton (H⁺) to the ether molecule.

The reaction between ethyl methyl ether and HI involves the nucleophilic attack of the iodide ion (I⁻) on the carbon atom of the ether, leading to the formation of an alkyl iodide.

The oxygen atom in the ether acts as a leaving group, resulting in the formation of ethanol (C₂H₅OH) and methyl iodide (CH₃I).

The other reagents listed:

A. NaOH (sodium hydroxide) is a strong base and does not readily react with ethers.

C. KMnO₄ (potassium permanganate) is an oxidizing agent and does not undergo a direct reaction with ethers.

D. H₂O (water) does not readily react with ethers under normal conditions.

Therefore, the correct answer is B. Concentrated HI.

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Answer:

5 atoms

Explanation:

there is 1 carbon atom and 4 hydrogen atoms

Answer:

The car is carrying a volume of air that is moving at 80 mph relative to the ground. But inside the car itself, the air not moving very much. If you take the windshield out and drive a 80 mph you will smash the fly onto the back window.

Explanation:

.

Answer:

naclo4+koh naoh+kclo4

Explanation:

if you know your cemestry

Answer:

it's A

Explanation:

The bonding in the aluminum chloride is closer to that of the chlorate ion in structure.

We know that sometimes, we can not be able to describe the properties of a compound or an ion or indeed any kind of chemical specie by just a single chemical structure. In that case, we would have to have recourse to a mix of structures that are able to show how the specie can be able to participate in a chemical reaction.

A close look at the carbonate ion and the nitrate ion would show us that the charge that is carried by the specie is delocalized over a number of atoms and such we can not be able to use only a single structure to explain the bonding that occurs in the ions.

On the other hand, the aluminium chloride is a compound that is ionic in nature. The bonding in the compound would look more like that of the chlorate ion which does not have the same molecular complexity as does the carbonate ion.

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Balanced equation for the precipitation reaction between potassium phosphate and magnesium sulfate:

2K₃PO₄(aq) + 3MgSO₄ → Mg₃(PO₄)₂ + 3K₂SO₄

K₃PO₄ is the salt potassium phosphate, it is soluble in water

MgSO₄ is the salt magnesium sulfate

Mg₃(PO₄)₂ is the insoluble salt magnesium phosphate, it forms precipate in this reaction

K₂SO₄ is the salt potassium sulphate, it is soluble in water

In a precipitation reaction substances react to form one or more solid products (in this example magnesium phosphate).

This chemical reaction is double displacement reaction - cations and anions of the two reactants switch places and form two new compounds.

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Ccal is defined as the amount of heat required to raise the temperature of the calorimeter by one degree.

Heat is a type of energy that is transferred from one body to another as a result of a temperature difference. Heat always flows from the body with a higher temperature to the body with a lower temperature.

Temperature is a measure of the hotness or coldness of a body or an object. The SI unit of temperature is Kelvin (K).

A calorimeter is an instrument used to measure the quantity of heat absorbed or released by a body or a system during a chemical or physical change. The heat capacity of a calorimeter is known as Ccal. It is defined as the amount of heat required to raise the temperature of the calorimeter by one degree.

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In order to find the percent yield of a reaction, you will need to calculate the theoretical yield first. The theoretical yield is the maximum amount of product that can be produced based on the amount of limiting reagent that was used.The percent yield of the reaction is 62.4%.

The balanced chemical equation for the reaction between phosphorus trichloride and water is: PCL3 + 3H2O → H3PO3 + 3HCLFrom the balanced equation, we can see that 1 mole of PCL3 produces 1 mole of H3PO3. So, we will need to convert the given mass of PCL3 to moles: PCL3 molar mass = 137.33 g/mol274 g PCL3 x 1 mol PCL3/137.33 g PCL3 = 1.996 mol PCL3From the stoichiometry of the balanced equation, we can see that 1 mole of PCL3 produces 1 mole of H3PO3. Therefore, the theoretical yield of H3PO3 is also 1.996 mol. The molar mass of H3PO3 is 81.99 g/mol. So, the theoretical yield in grams is:1.996 mol H3PO3 x 81.99 g/mol = 163.49 g H3PO3 Now, we can use the given mass of H3PO3 to calculate the percent yield: Percent yield = actual yield / theoretical yield x 100% Actual yield = mass of H3PO3 produced = 102 g Percent yield = 102 g / 163.49 g x 100% = 62.4%Therefore, the percent yield of the reaction is 62.4%.

The percent yield of the reaction is 62.4%. This value tells us that only 62.4% of the theoretical yield of H3PO3 was actually produced. The reason for this may be due to various factors such as incomplete reaction, loss of product during filtration or purification, or other experimental errors. It is important to strive for high percent yields in chemical reactions to minimize waste and maximize efficiency.

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