give two advantages of a galvanic cell, as described in the model, compared to inserting a zinc bar into a Cu^2+ solution

Based on the trend of electronegativities values of the elements Be, Mg, Ca, and, Sr within their group (increasing from bottom to top), the atoms of the element Sr will have the least attraction for an electron.  

We need to remember that electronegativity indicates the affinity or attraction of an element for an electron. Hence, the higher the electronegativity, the higher the attraction of that element for an electron.  

The values of electronegativities of the given elements are the following:

Be = 1.57

Mg = 1.31

Ca = 1.0

Sr = 0.95

We can see that the increasing trend of electronegativities in this group is from the bottom to the top, having the Sr with the lowest electronegativity value and the Be with the highest.  

This trend is related to atomic size, the larger the atomic size, the lower the electronegativity because the electron in the outermost shell will feel less attraction towards the nucleus of an atom. In a group of the periodic table, the size of an atom will increase from top to bottom.          

Therefore, according to the said above, the atoms of the Sr will have the least attraction for an electron (it has the lower electronegativity value).

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Answer:

The main difference between the heat of formation and heat of reaction is that heat of formation is the amount of energy either absorbed or released during the formation of a compound whereas heat of reaction is the amount of energy either absorbed or released during any chemical reaction.

Answer:

The answer is 1:1

Explanation:

Here are three equations representing the chemical reaction between a metal and an acid:

Zinc + 2HCl → ZnCl2 + H2

Iron + 2HNO3 → Fe(NO3)2 + H2O + NO

Magnesium + 2H2SO4 → MgSO4 + 2H2O + SO2

The three equations representing the reaction :

In this reaction, zinc (metal) reacts with hydrochloric acid to form zinc chloride and hydrogen gas.

In this reaction, iron (metal) reacts with nitric acid to form iron(II) nitrate, water, and nitric oxide.

In this reaction, magnesium (metal) reacts with sulfuric acid to form magnesium sulfate, water, and sulfur dioxide.

In each of these equations, the metal reacts with the acid to produce a salt, water, and sometimes additional products such as hydrogen gas (H2), nitrogen dioxide (NO2), nitrogen monoxide (NO), or sulfur dioxide (SO2), depending on the specific acid and reaction conditions.

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Answer:

Try quizlet, they have everything on there

Explanation:

Chromium acetate is diamagnetic because it does not have any unpaired electrons in its orbitals, which are required for magnetic behavior.

Diamagnetic materials are materials that are not attracted to magnetic fields, and they behave in a manner that is opposite to magnetic materials, known as paramagnetic materials.

Chromium acetate has a complete electron shell configuration with all electrons paired, which means that the electrons are paired in the orbitals, and there is no net magnetic moment.

As a result, chromium acetate does not exhibit any magnetic properties and is considered to be diamagnetic.

The diamagnetic behavior of chromium acetate can be explained by the principles of quantum mechanics and the orbital configuration of the atoms in the molecule.

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The RK of methyl orange is 3.5, as it changes color from red to yellow at a pH of 3, and has its most intense color (yellow) at pH 6.

Methyl is an organic compound with a formula of CH3, which is a single carbon atom bonded to three hydrogen atoms. It is a type of hydrocarbon and is the simplest of all alkyl compounds. Methyl is a versatile molecule that can be found in a variety of compounds, including pharmaceuticals, solvents, fragrances, and food additives. It is also used in the production of plastics, rubber, dyes, and other synthetic materials. Additionally, methyl is a key component of natural gas, oil, and coal, and can also be produced from biomass. In the body, methyl is used for a variety of biological processes, such as the metabolism of proteins, carbohydrates, and fats.

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Yes i think that a glass of water contains carbon because , carbon dioxide diffuses into water . The amount of carbon dioxide in the glass of water and the amount of carbon dioxide in the atmosphere are precisely proportional  .

The carbon dioxide that almost all natural waters contain is obtained in a variety of ways . Some of this gas is absorbed by rain as it falls through the air. Rainwater that has been somewhat acidic on its journey to the earth will brings  more carbon dioxide if it passes through decomposing plants .  Although in considerably lesser amounts than in carbonated beverages , carbon dioxide gas can also be found in a glass of water .

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The molarity of the K₂CO₃ solution is 2.36 M.

The unit of molarity is molar or M is the same as moles per liter, when n moles of a compound appear that have been dissolved in V liters of solution, the molarity formula is \(M = n/V\)

M = molarity

n = number of moles

V = volume of solution

The concentration of the solution states the quantitative composition of the substance that has been dissolved and the solvent in the solution. Determination of the concentration or vice versa depends on the number of solution ratios of each substance that enters. Chemical reactions occur during the process and result from the presence of the same solution.

So, the molarity of the K₂CO₃ solution is:

\(M =6.63/2.8\)

\(=2.36\) M

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The volume of this gas if placed at stp is 156.7 L.

What is mole?

The amount of substance that has the same number of chemical species (atoms, molecules, ions, etc.) as the number of atoms present in 12g of the carbon-12 isotope is referred to as a mole.

What is gas?

The intermolecular forces of attraction are even weaker than in the liquid form of matter in the gas state. The gas particles are spaced farther apart from one another. Given its kinetic energy, the molecule has weak intermolecular forces.

PV=nRT

V=30.4L

n=6.9 moles

T=335 K

R= 62.36 L.Torr/K.mol

Then,

P=(6.9molx62.36(L.Torr/K.mol)x335K)/30.4L

P=4741 Torr

At STP conditions are T=273.15 K and P=100kPa

Then, V=(6.9molesx273.15Kx8.314(L.KPa/K.mol))/100KPa

V=156.7 L

Therefore,  the volume of this gas if placed at stp is 156.7 L.

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Burning and other changes in matter do not destroy matter. The mass of matter is always the same before and after the changes occur. The law of conservation of mass states that matter cannot be created or destroyed

The thing that is happen in a food sample as it is burned is the chemical and physical change.

Comubustion reactions are those reactions in which organic compound get burnt in the presence of oxygen for the formation of carbon dioxide gas and water molecule.

If the food sample contains the organic compound then it will convert into water and carbon dioxide gas and if it contains the matter in the form of inorganic compounds then it will convert into another product but having the same mass.

Hence if matter of food sample is burned then it will convert into small products as a result of physical or chemical change.

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Answer:

color change, formation of a precipitate, formation of a gas, odor change, temperature change.

Answer:

The correct answer is B. From the chemical reaction, the reactants are carbon dioxide and water. Reactants are the substances that take part in the chemical reaction which, as a result, produces new substances called the products

Explanation:

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The concentration (m) of ch3oh in a solution prepared by dissolving 34.4 g of ch3oh in sufficient water to give exactly 230 ml of solution is 1.59 m

The concentration of ch3oh can be calculated using the formula:Concentration (m) = (number of moles of solute) / (volume of solution in liters)

Given: Mass of ch3oh = 34.4 g

Volume of solution = 230 mL

= 0.230 L

To calculate the concentration of ch3oh in molarity:Convert mass of ch3oh to moles

.The molar mass of ch3oh is 32.04 g/mol.Number of moles of

= Mass of ch3oh / Molar mass of ch3oh

= 34.4 g / 32.04 g/mol

= 1.074 mol

Calculate the concentration of ch3oh.

Concentration (m) = Number of moles of ch3oh / Volume of solution in liters

= 1.074 mol / 0.230 L

= 4.67 M

Thus, the concentration (m) of ch3oh in a solution prepared by dissolving 34.4 g of ch3oh in sufficient water to give exactly 230 ml of solution is 4.67 m.

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Answer:

B

Explanation:

The key difference between electron domain geometry and molecular geometry is that the former takes into account all electron pairs, while the latter only considers the atoms in the molecule.

Electron domain geometry refers to the arrangement of electron pairs around the central atom of a molecule or ion, regardless of whether the electron pairs are bonding or nonbonding. On the other hand, molecular geometry refers to the spatial arrangement of only the atoms in a molecule or ion, and not the non-bonding electron pairs.

It takes into account all the electron pairs around the central atom, including lone pairs and bonding pairs. On the other hand, molecular geometry refers to the spatial arrangement of only the atoms in a molecule or ion, and not the non-bonding electron pairs.

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Answer:

if it loses an electron, it becomes positively charged

Explanation:

If electrons are removed from an atom, then it has more positive charges than negative ones, and the atom has an overall positive charge. Positive ions are called cations. The sharing or exchanging of electrons is what forms bonds between atoms.

Answer is C

A synthesis reaction looks like this:

A+ B → AB

Answer:

The motion towards or away from us based on the Doppler effect and corresponding red shift or blue shift.

Explanation:

The emission and absorption spectra demonstrates the lines where light has been absorbed by the atoms. The spikes can be observed due to atoms releasing photons at those wavelengths. Infrared and ultra violet waves can be observed during spectroscopy.

Cyclopentadiene must be freshly distilled and kept cold prior to a Diels-Alder reaction because it is a highly reactive compound.

It can undergo self-dimerization or polymerization at room temperature, leading to an undesired mixture of products. Freshly distilled cyclopentadiene is more reactive and less likely to undergo unwanted side reactions. Additionally, keeping it cold helps to minimize its reactivity and prevent premature reactions.

The Diels-Alder reaction involves the formation of a cyclic adduct between a diene and a dienophile, and the use of freshly distilled and cold cyclopentadiene ensures that the reaction proceeds as planned, yielding a high purity product.

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Answer:

Cell wall

Explanation:

i just searched it up

Answer:

Chloroform has a boiling point of 61.15 degrees Celsius and a vapor pressure of 9.5 kPa at 20 degrees Celsius. Glycerol, on the other hand, has a boiling point of 290 degrees Celsius and a vapor pressure of 0.0002 kPa at 20 degrees Celsius. Therefore, chloroform has a much lower boiling point and a much higher vapor pressure than glycerol. This means that chloroform is more volatile and evaporates more easily than glycerol.

Explanation:

Chloroform has a boiling point of 61.15 degrees Celsius and a vapor pressure of 9.5 kPa at 20 degrees Celsius. Glycerol, on the other hand, has a boiling point of 290 degrees Celsius and a vapor pressure of 0.0002 kPa at 20 degrees Celsius. Therefore, chloroform has a much lower boiling point and a much higher vapor pressure than glycerol. This means that chloroform is more volatile and evaporates more easily than glycerol.

Answer:

When you are in the laboratory and take a direct sniff the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs. When its necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air towards your face.

Gas is a naturally odourless substance, but the completely harmless artificial smell is added to make it more detectable. The substance is called mercaptan and gives off a strong sulphur like smell.

The mass of NaNO3 would be needed to make a saturated solution in 200 mL of water at 80°C is 296g.

A solubility curve is the line drawn on a graph to depict the relationship between temperature and a substance's solubility at various temperatures. Where the solution is saturated is shown by the lines on the solubility curve. Anywhere below the lines, there is still room for more solute to dissolve because the solution is not saturated.

Solubility of NaNO3 in water at 80°C is 148g/100mL.

The quantity of water at 80°C = 200 mL

Therefore, the weight of NaNO3 = 148g/100mL x 200mL

                                                         => 296g

A saturated solution is one that has as much solute in it as can be dissolved under the circumstances in which it is present. Seawater, Epsom bath salts, carbonated beverages, and powdered beverages are a few examples of saturated solutions.

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These equations relate the heat capacities of the diatomic ideal gas to its translational, rotational, and vibrational motion.

(a) The ideal gas law states that \(PV = nRT\), 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.

To demonstrate that the diatomic ideal gas still obeys the ideal gas law, we need to show that\(PV = NkBT\), where N is the total number of molecules and kB is the Boltzmann constant.

Using the expression for the molecular partition function q, we have q = qtrans × qelec × qrot × qvib. Substituting the given expression for q into the ideal gas law, we get:

NkBT = \(qtrans × qelec × qrot × qvib × (1/V) × ge × geβDe × Θrot/T × (1 - e^(-T/Θvib)) × e^(-2T/Θvib)\)

Simplifying this equation, we can see that the terms qtrans, qelec, qrot, and qvib all cancel out, leaving us with

\(NkBT = (1/V) × ge × geβDe × Θrot/T × (1 - e^(-T/Θvib)) × e^(-2T/Θvib).\)

This equation shows that the diatomic ideal gas still obeys the ideal gas law, as it relates the pressure, volume, and temperature of the gas.

(b) The average energy of the diatomic ideal gas can be written as the sum of the average energies of its translational, electronic, rotational, and vibrational motion. We can write

\(⟨E⟩ = ⟨E⟩trans + ⟨E⟩elec + ⟨E⟩rot + ⟨E⟩vib.\)

To derive an equation for each of the four average energies, we can use the formulas:

\(⟨E⟩trans = (3/2)kBT\),
\(⟨E⟩elec = geβDe,\)
\(⟨E⟩rot = Θrot,\)
\(⟨E⟩vib = (Θvib/2) + (Θvib/T)e^(-Θvib/T)/(1 - e^(-Θvib/T)).\)

(c) The heat capacity of the diatomic ideal gas can be written as the sum of the heat capacities for its translational, rotational, and vibrational motion. We can write \(CV = CV,trans + CV,rot + CV,vib.\)

To derive an equation for each of the three heat capacities, we can use the formulas:

\(CV,trans = (3/2)R,\)
\(CV,rot = R\),
\(CV,vib = R × (Θvib/T)^2 × e^(-Θvib/T)/((1 - e^(-Θvib/T))^2).\)

These equations relate the heat capacities of the diatomic ideal gas to its translational, rotational, and vibrational motion.

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The molarity of the new solution if 0.50 litre of 2.0 M HCl is diluted with water to a volume of 1.0 litre is 1.0 M.

To solve this problem, the formula for molarity can be used.

Molarity = moles of solute/litres of solutionIn this case, the initial solution of HCl has a volume of 0.50 litres and a concentration of 2.0 M. Thus, the number of moles of HCl in the initial solution is: moles of HCl = concentration × volume = 2.0 M × 0.50 L = 1.0 molThe final volume of the solution is 1.0 L, therefore the new molarity of the solution can be calculated as Molarity = moles of solute/litres of solution = 1.0 mol / 1.0 L = 1.0 MTherefore, the molarity of the new solution is 1.0 M.

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Answer:1.0m

Explanation: