A solution contains 10.5 mL of HI and 139.5 mL of water. What is the % by volume of the solution?

The oxidized element is Fe and the reduced element is O₂ . Iron reacts with oxygen and atmospheric moisture in this way.

          4Fe +30₂ → 2 Fe₂O₃               (Balance Equation)

a) Fe in oxidised

O₂ in reduced

b) 4Fe  →  4Fe³⁺ + 12 e⁻

3O₂ + 12e⁻→  6O₂

so, 12 e⁻ are involved in the reaction.

The response of the rusting of iron includes an expansion in the oxidation condition of iron, joined by a deficiency of electrons. Rust is for the most part comprised of two distinct oxides of iron that change in the oxidation condition of the iron molecule. These are oxides: Ferrous oxide or iron(II) oxide

Reduction is the process of gaining electrons, and oxidation is the process of losing electrons. Red denotes reduction and ox denotes oxidation in redox reactions. Redox reactions can also be seen in iron rusting. Iron reacts with oxygen and atmospheric moisture in this way.

Incomplete question :

Rust (FeO)) forms on abandoned cars such as the one in this photo through a series of reactions between iron in the car and oxygen in the atmosphere. The unbalanced chemical equation for this reaction is 1st attempt Part 1 (0.7 point) Ju See Periodic Table Q See Hint Which element is oxldl zed and which is reduced during the formation of rust? Write the elemental symbol for each is oxidized s reduced

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The evidence that refutes the statement is: 4 EVIDENCE: Scientists have observed galaxies are moving away from us.

According to the observations made by astronomers, galaxies in the universe are not only moving away from each other, but they are also moving away from us.

This phenomenon is known as the expansion of the universe, and it contradicts the idea that all matter and energy in the universe was initially concentrated in a tiny corner of space during the time of the big bang and has since filled up the entire universe.

The observation that galaxies are moving away from us suggests that the universe is expanding in all directions. This expansion implies that the universe was not initially confined to a specific location but rather underwent a rapid expansion from a highly dense and hot state.

Therefore, the idea that all matter and energy in the universe was initially concentrated in a small corner of space and then expanded to fill up the whole universe is inaccurate based on the evidence of the observed expansion of galaxies. Evidence 4

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Answer:

In general, the trend in atomic radius as the atomic number in a vertical column of the periodic table increases is to increase.

Explanation:

The atomic radius represents the distance between the nucleus and the valence shell (that is, the outermost). By means of the atomic radius it is possible to determine the size of the atom.

In groups, the atomic radius increases with the atomic number, that is, down a column. This is because as the atomic number of the elements in a group increases, the number of occupied levels increases, while the effective nuclear charge on the outermost electron is the same. Consequently, the atomic radius increases.

In other words, when you go down in a group (column) of the periodic table, the effective nuclear charge increases, but the number of electrons added with respect to the previous element, the same group increases in a complete shell. The effect of adding new electronic shells is predominant, so they are increasingly distant from the atomic nucleus and the atomic radius is greater when you go down in a group.

So the increase in atomic radius as you go down in a group is due to the increase in electron shells.

Answer:

Heterogeneous mixture...is the answer

The dude above me is right. I thought he was wrong, so I put A but it turns out he was right!

The color of Statue of Liberty was initially the shade of copper but it has under went oxidation which changed it's color to green indicating  that a chemical change took place in it.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

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Using the given mass of the compound (0.520 g) and the calculated moles, we can determine the molar mass of the compound.

To find the molar mass of the compound, we can use the formula:

ΔT = Kf * m

where ΔT is the freezing point depression, Kf is the cryoscopic constant (in this case, 3.90 °C/m), and m is the molality of the solution.

First, we need to calculate the molality (m) of the solution:

m = moles of solute / mass of solvent (in kg)

The mass of the solvent (lauric acid) is given as 4.62 g. Since the unknown compound is a solute, we need to convert its mass to moles:

moles = mass / molar mass

Given that the mass of the unknown compound is 0.520 g, we can now calculate the moles of the compound.

Next, we convert the mass of the solvent to kg by dividing by 1000:

mass of solvent (lauric acid) = 4.62 g / 1000 = 0.00462 kg

Now we can calculate the molality:

m = moles of solute / mass of solvent = (moles of the compound) / (mass of solvent)

Finally, we can use the freezing point depression formula to find the molar mass of the compound:

ΔT = Kf * m

Substituting the given values:

4.20 °C = 3.90 °C/m * m

Now solve for m:

m = (4.20 °C) / (3.90 °C/m)

Once we have the molality, we can calculate the moles of the compound:

moles = molality * mass of solvent (in kg)

Finally, we calculate the molar mass:

molar mass = mass of solute / moles of solute

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Statement correctly describes a titration : A titration relies on a reaction that takes place in solution.

Basically, titration is a chemical method to determine the concentration of a solution. The trick is to react a solution in a certain volume with another solution whose concentration of the substance is known. This known solution is called a frozen solution. While the purpose of the titration itself is to determine the pH level of a chemical substance. The end point is when the indicator changes color.

This titration measurement usually uses several special tools, including a burette, stative, Erlenmeyer tube, rubber suction cup, watch glass, dropper pipette, measuring flask, and volume pipette. One of the conditions for the titration to run well is that it is characterized by a fast reaction, you can even use a catalyst to speed up the reaction. Furthermore, the reaction proceeds simply and the stoichiometric equation is clear. Then there are no side reactions that can affect the main reaction.

Based on the type, the titration is divided into four types. The three types are redox titrations, complexation titrations, and acid-base titrations and argentometry. For more details about these three types of titration, you can see in the following review.

Redox Titration

For this type of redox titration is a type of titration that processes with redox reactions. Redox in titration is still divided into three. Namely those that use I2 and are indirect titrations. This is because the reacted I2 is still made by the previous redox reaction. Meanwhile for the second type is iodometric titration which is used directly in I2 and can be called a direct reaction. The third type of redox is permanganometric where the reaction utilizes Mn2+ ions.

This type of complexation titration is actually a titration that uses complexation reactions and the formation of complex ions. Its use is usually to analyze metal levels. When you want to do a type titration there are several things to consider. This is more because the formation of complex ions is very specific under certain conditions.

The third type of titration is the acid-base titration. Actually, for this titration it refers more to a quantitative analysis method based on acid-base reactions. The indicators used are usually those that can profile the color change at a certain pH.

This last type is argentometric titration. This titration is a titration commonly used for precipitation reactions. Based on the principle of argentometric titration regarding solubility as well as the product constants of the reacting reagents. The method for Argentometric titration is divided into the Mohr method, the Volhard method, and the Fajans method.

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Answer:

10 must be added

Explanation:

The molarity of a solution prepared by diluting 40.0 ml of 0.0706 m ammonium sulfate to 500.00 ml is

Molarity of solution = M₁

Molarity of Ammonium sulfate (M₂) = 0.0706 m

Volume of Solution (V₁) = 40.0 ml

Volume of ammonium sulfate (V₂) = 500.00 ml

According to Dilution formula - M₁V₁=M₂V₂

M₁ = M₂V₂/V₁

M₁ = 0.0706 m × 500 × 10⁻³ L/ 40× 10⁻³ L

M₁ = 0.8825 m

Molarity is defined as number of moles of solute in 1 litre of solution. It is used to measure concentration of a solution. It is also called amount concentration, molar concentration or substance concentration.

Concentration of solution can also be measured using molality, normality etc.

Units: Moles/ litre

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The law of conservation of energy has not been broken, provided energy is released from the fission process.

The law states that the total energy of a process is conserved. That is, the total energy or mass of a system before and after undergoing processing remains the same. However, some of the mass/energy can be converted to another form.

When a material undergoes fission, the sum total of the mass of the particles formed should be equal to the mass of the starting materials, provided that all other things remain the same.

However, if energy is released from the fission process, it means that some of the mass of the starting materials has been converted to energy and released to the environment.

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In the given chemical reaction iron is less electropositive metal and aluminum is more electropositive and behave as a reducing agent also.

Electropositivity is the ability of an atom of donation or losing of electrons easily.

From the given chemical reaction it is clear that oxidation state of iron changes from +3 to 0 & of aluminum is from 0 to +3. So in the above chemical reaction aluminum is more electropositive than iron metal. And aluminum is behave as a reducing agent as it helps in the reduction process by providing electrons.

Hence aluminum is electropositive metal and reducing agent, iron is less electropositive.

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The masses of proton ( in kilogram) = 1.67262 × 10−27 kg ( six significant figure).

Proton is a stable subatomic particle with symbols p, H+ or 1H+ and a positive charge of +1 e elementary charge. Its mass is slightly less than that of a neutron.

A neutron is a subatomic particle (symbol n or n⁰ ) with a neutral charge and a mass slightly greater than that of a proton. Protons and neutrons form the nucleus. Electrons, protons, and neutrons are the elementary particles that make up atoms. Atoms consist of a central nucleus containing neutrons and protons. Electrons revolve around the nucleus. Electrons are negatively charged, protons are positively charged, and neutrons are neutral. The electron mass is the mass of the rest electron, also known as the invariant mass of the electron.

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Answer:

The balanced equation tells us that 2 moles of sodium hydroxide react with 1 mole of sulfuric acid. Therefore, to react with 1.30 moles of sulfuric acid, we need:

$2 \times 1.30 = 2.60$ moles of sodium hydroxide.

To convert moles of sodium hydroxide to mass, we need to use its molar mass. The molar mass of sodium hydroxide is:

$1 \times 23.0 + 1 \times 16.0 + 1 \times 1.0 = 40.0$ g/mol.

Therefore, the mass of sodium hydroxide needed is:

$2.60 \text{ moles} \times 40.0 \text{ g/mol} = 104 \text{ g}$.

Answer: 104 g (with 3 significant figures).

The rate at which N\(_{2}\) disappears is 0.016 M/s, while the rate at which H\(_{2}\) disappears is 0.0213 M/s.

In the balanced chemical equation N\(_{2}\)(g) + 3 H\(_{2}\) (g) → 2NH\(_{3}\)(g), the stoichiometric coefficients represent the mole ratios between the reactants and products.

Since the reaction rate is given for NH\(_{3}\), we can determine the rates of disappearance of  N\(_{2}\) and H\(_{2}\) by comparing their stoichiometric ratios in the reaction.

The stoichiometric ratio between  N\(_{2}\) and NH\(_{3}\) is 1:2, meaning for every mole of  N\(_{2}\) consumed, 2 moles of NH\(_{3}\) are produced. Therefore, the rate of disappearance of  N\(_{2}\) is half of the rate of formation of NH\(_{3}\).

Similarly, the stoichiometric ratio between H\(_{2}\) and NH\(_{3}\) is 3:2. This means that for every 3 moles of H\(_{2}\) consumed, 2 moles of NH\(_{3}\) are produced. Therefore, the rate of disappearance of  H\(_{2}\) is (2/3) times the rate of formation of NH\(_{3}\).

Given the rate of formation of NH\(_{3}\) as 0.032 M/s, the rate of disappearance of  N\(_{2}\) would be 0.016 M/s (0.032 M/s ÷ 2), and the rate of disappearance of  H\(_{2}\) would be approximately 0.0213 M/s (0.032 M/s × 2/3).

Therefore, the rate of disappearance of  N\(_{2}\) is 0.016 M/s, and the rate of disappearance of  H\(_{2}\) is 0.0213 M/s.

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The automobile gasoline tank will hold 59.05 pounds of gasoline.

Given that the volume of the gasoline tank of the automobile is 19.0 gal. and the density of the gasoline is 0.737 g/mL. So, we need to calculate the number of pounds of gasoline the tank can hold.The relationship between volume and density is as follows;Density= Mass/ VolumeRearranging the equation gives; Mass= Density × VolumeSubstitute the given values in the above equation;Mass = 0.737 g/mL × 19.0 gal × 3.78541 L/galWe know that; 1 L = 1 dm³Thus,Mass = 0.737 g/mL × 19.0 gal × 3.78541 dm³/LMass = 53.70 kgThe given mass is in kg and we need to convert it into pounds;1 kg = 2.20462 poundsThus,Mass = 53.70 kg × 2.20462 pounds/kgMass = 118.4 pounds therefore, the automobile gasoline tank will hold 59.05 pounds of gasoline.

Given that the volume of the gasoline tank of the automobile is 19.0 gal. and the density of the gasoline is 0.737 g/mL. So, we need to calculate the number of pounds of gasoline the tank can hold.The relationship between volume and density is as follows;Density= Mass/ VolumeThe above equation can be rearranged as; Mass= Density × Volume Substitute the given values in the above equation;Mass = 0.737 g/mL × 19.0 gal × 3.78541 L/galMass = 53.70 kgThe given mass is in kg and we need to convert it into pounds;1 kg = 2.20462 poundsThus,Mass = 53.70 kg × 2.20462 pounds/kgMass = 118.4 pounds therefore, the automobile gasoline tank will hold 59.05 pounds of gasoline.

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Answer:

papillae

Explanation:

Answer:

parti Ng dila sguro! hecdsjsjves

Answer:

V = 0.798 L

Explanation:

Hello there!

In this case, for this gas stoichiometry problem, we first need to compute the moles of carbon dioxide via stoichiometry and the molar mass of starting calcium carbonate:

\(3.56gCaCO_3*\frac{1molCaCO_3}{100gCaCO_3} *\frac{1molCO_2}{1molCaCO_3} =0.0356molCO_2\)

Next, we use the ideal gas equation for computing the volume, by bearing to mind that the STP conditions stand for a pressure of 1 atm and a temperature of 273.15 K:

\(PV=nRT\\\\V=\frac{nRT}{P}\\\\V=\frac{0.0356mol*0.08206\frac{atm*L}{mol*K}*273.15K}{1atm} \\\\V=0.798L\)

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1) The activation energy is 80 kJ

2) I represents the activation energy

3) The change in energy is 20 kJ

4) The reaction is endothermic

5) After the catalyst was added the activation energy decreased to 50 kJ

6) The activation energy after the catalyst was added is II

The very minimum of energy needed for a chemical reaction to take place is called activation energy. In order for reactant molecules to transform into products, the energy barrier must be broken.

Chemistry places a lot of emphasis on the idea of activation energy since it affects how quickly a reaction proceeds. The reaction moves more slowly the larger the activation energy.

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To be considered an amino acid, a molecule must have three components: an amino group (NH_2), a carboxyl group (COOH), and a variable side chain (R-group).

The amino group (NH2) is a functional group composed of one nitrogen atom bonded to two hydrogen atoms. It acts as a base, accepting a proton (H+) to form an ammonium ion (NH3+) under acidic conditions.

The carboxyl group (COOH) is a functional group composed of one carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (-OH). It acts as an acid, donating a proton (H+) to form a carboxylate ion (COO-) under basic conditions.

The variable side chain, also known as the R-group, differentiates one amino acid from another. It can vary in structure, size, and chemical properties, which contributes to the diversity and functionality of different amino acids.

When these three components are present in a molecule, it can be classified as an amino acid. Amino acids are the building blocks of proteins and play essential roles in various biological processes.

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Answer:

exothermic reaction

Explanation:

your welcome :)

There are 26 needed electrons are in the chlorate ion ClO₃⁻.

The chlorate ion contains one chlorine atom along with three oxygen atoms. In addition, the ClO₃⁻ ion has a  -1 charge.

The periodic table has groups for oxygen and chlorine at positions 7 and 6, respectively. The valence shell of chlorine has seven electrons. Six electrons contain the valence shell of the oxygen atom.

With a charge of -1, the chlorate ion contains one extra electron than a neutral ClO₃ molecule. A total of 26 valence electrons make up the ClO₃⁻ ion.

The ability of having greater valance is important. Chlorine can show valence 7. But, oxygen's maximum valence is 2. Therefore chlorine has more chance to be the center atom

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The Ka of nitrous acid is approximately 4.608 × 10⁻5.

To find the Ka of nitrous acid (\(HNO_{2}\)), we'll use the equilibrium concentrations given in the question. The reaction for nitrous acid dissociation is:

\(HNO_{2}\) ⇌ \(H_{3} O\)+\(NO_{2}\)-

At equilibrium, the concentrations are:
[\(HNO_{2}\)] = 0.050 M
[\(H_{3} O\)+] = [\(NO_{2}\)-] = 4.8 × 10⁻³ M

The Ka expression for nitrous acid is:
Ka = (\(H_{3} O\)+][\(NO_{2}\)-]) / [\(HNO_{2}\)]

Substitute the equilibrium concentrations into the Ka expression:
Ka = (4.8 × 10⁻³)(4.8 × 10⁻³) / 0.050

Now, calculate the Ka value:
Ka ≈ 4.608 ×\(10^{-5}\)

So, the Ka of nitrous acid is approximately 4.608 × \(10^{-5}\)

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Mac's behavior in the example provided illustrates projection.

Projection is defined as a mental process in which people attribute or

displace their feelings onto others. This is usually done unconsciously

under stressful conditions.

In this scenario, we were told that Mac was angry at his teacher and took

out his anger on his little brother which depicts Projection.

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Within most of the temperature range that we find liquid water on earth, the density of that water increases as its temperature decreases.

This is because water molecules slow down and come closer together as temperature decreases, making the water more dense. However, this trend reverses when the water reaches its freezing point, as ice is less dense than liquid water.

The difference between the pure solvent's freezing point and the solution's freezing point is not the freezing point depression.

The difference between the freezing point of the pure solvent and the freezing point of the solution is known as the freezing point depression. In other words, it refers to how much a solute lowers the solvent's freezing point when it is added to it.

The concentration of the solute in the solution, as well as the characteristics of the solvent and solute, are all factors that affect the freezing point depression. The freezing point depression increases with the solute concentration.

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Answer:

D. It prevents charges from building up in the solutions :)

Explanation:

A P E X

It's clear that the strongest intermolecular forces holding CF2Cl2 molecules together are Dipole-dipole interactions(DDI).

The strongest intermolecular forces(F) holding CF2Cl2 molecules together are DDI. Intermolecular forces are the forces that bind molecules to one another, and these forces have a significant impact on the physical properties of compounds. Dipole-dipole interactions occur when two polar molecules come into contact with one another. The direction of the molecule's dipole moment(u) determines the orientation of dipole-dipole forces. Dipole-dipole interactions are most significant in substances composed of polar molecules, such as CF2Cl2. These forces arise as a result of the partial negative charge on one molecule interacting with the partial positive charge on another molecule.

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The frequency of light associated with the transition from n=2 to n=3 is approximately 5/36 times the Rydberg constant.The frequency of light associated with the transition from one energy level to another can be calculated using the Rydberg formula, which is given by:

ν = R * (1/n₁² - 1/n₂²)

where ν is the frequency of light, R is the Rydberg constant (approximately 3.29 x 10^15 Hz), n₁ is the initial energy level, and n₂ is the final energy level.

Given that the transition is from n=2 to n=3, we can substitute these values into the formula and calculate the frequency:

ν = R * (1/2² - 1/3²)

ν = R * (1/4 - 1/9)

ν = R * (9/36 - 4/36)

ν = R * (5/36)

The frequency of light associated with the transition from n=2 to n=3 is approximately 5/36 times the Rydberg constant.

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Answer:

C, Reactants rearrange to form new products

Explanation:

The concentration of Vitamin C in the tablet and in the orange to determine concentration the concentration has increases the vitamin C content

Vitamin C is an antioxidant that help to protect cell against the effect of free radicle and vitamin C is used for the growth and repair of tissues in all parts of your body

Mild and standard pasteurization slightly increases the total vitamin C content as contribution from orange solid parts whereas concentration and freezing did not show significant changes and orange juice is simply healthier and has many nutrient and in addition to being the rich sources and pure 100 gram sample of vegetable and fruits and strain it through cheesecloth with about 50 mL of distilled water and add distilled water to bring the total volume up to 100 mL from your measurement you can figure out how much vitamin C there is per 100 g of the fruit or vegetable you sampled

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