1. Define λmax and explain why it is desirable to do the experimental procedure at λmax? 2. Around what absorbance would you expect the λmax to be with each color solution? (Blue, green, red, yellow) 3. A pipet is used to make the solution dilutions in lab. Suppose in making the dilution, additional distilled water is accidentally added. Will the concentration of the solution be higher or lower that disered? Explain.

Answer:

Boiling Point!

Explanation:

Hope this helps. Good luck!

Answer:

A molecule's shape strongly affects its physical properties and the way it interacts with other molecules, and plays an important role in the way that biological molecules (proteins, enzymes, DNA, etc.) interact with each other.

Explanation:

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, by rotation of molecule or bond , we can change the shape of molecule.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The compound that is ionic in nature can be dissociated very easily in water. Since ionic compounds are polar in nature, they readily dissolve in water. To change the shape of your molecular models without breaking any of the covalent bonds is by rotating the molecule or a bond.

Therefore, by rotation of molecule or bond , we can change the shape of molecule.

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A. Electrons, B. Protons, and C. Neutrons are the sub-atomic particles found in an atom. Electrons are subatomic particles with a negative charge that revolve around an atom's nucleus. The atom's nucleus contains positively charged protons, which are particles. Neutrons, neutral particles, are also present in the atom's nucleus.

Molecules are not sub-atomic particles, but rather a group of atoms that are chemically bonded together. Electrons determine the chemical properties of an element; protons determine the atomic number and neutrons add mass to the atom.

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Answer: hope this helps!

Explanation:

Answer:

10

Explanation:

Atomic number = No. of protons

Therefore, the number of protons of an element with an atomic number of 10, is also 10.

Explanation:

The union of vinegar and bicarbonate produces carbon dioxide

The carbonic acid, which is weaker, in turn breaks down into water and carbon dioxide, which being volatile separates

will observe a yellow color, confirming that BASIC HYDROLYSIS has taken place. To the touch the bottle cools and in the end a white deposit may remain on the bottom.

The pH of the buffer solution is 1.84.

The pH of a buffer solution can be determined using the Henderson-Hasselbalch equation:

pH = pKa + log([base]/[acid])

In this case, we have:

pH = 2.20 + log(1.75/4.00)

pH = 2.20 + log(0.4375)

pH = 2.20 + (-0.359)

pH = 1.84

Therefore, the pH of the buffer solution is 1.84.

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Answer:

2KClO3 = 2KCl + 3O2

I hope it's helps you

When equilibrium between the dissolved and undissolved solute is reached, the solution must be saturated

A saturated solution is a solution that generally contains the maximum amount of solute that can be dissolved under the condition of a solution at which the solution exists. After studying solutions and properties of the solution, one can understand that a solution can reach a status of saturation.

The saturation phase is when all of the solute is completely dissolved in the solution and when we keep adding more and more excess of the solute into the solution then the solute will stop dissolving itself as now it has reached a saturation level after which no dissolution will take place.

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I feel confident about modeling how the energy in a reaction will change, because this unit provided me with the information necessary to determine the type. With this knowledge, I can now interrelate with other properties and believe that this new ability will assist in future units as well. This unit has encouraged a deeper understanding of the world and its guiding principles.

(HOPE THIS HELPS <3)

\( \sf \implies 12 + ( 16\times 2) \\ \)

\( \sf \implies 12 + 32 \\ \)

\( \sf \implies 44 \\ \)

That means one mole of \( \sf CO_{2} \)has a mass of 44 g.

1 mole of carbon dioxide is equal to \( \sf 6.02 \times 10^{23}\\ \) molecules of carbon dioxide.Then, 7 moles is equal to -

\( \sf \implies 7\times 6.02\times 10^{23} molecules \\ \)

\( \sf \implies 4.214 \times 10^{24} \\ \)

The 10-newton ball will have a greater momentum than the 5-newton ball at the end of 3 seconds of free fall, since momentum is directly proportional to mass. The statement "At the end of 3 seconds of free-fall, the 10-N ball will have a greater momentum than the 5-N ball" is true.

In the absence of air resistance, both the 5-newton ball and the 10-newton ball will experience the same acceleration due to gravity, which is approximately 9.8 meters per second squared (m/s²) near the surface of the Earth. Therefore, the gravitational force acting on both balls will be proportional to their respective masses.

The mass of an object is directly related to its inertia and momentum. Since the 10-newton ball has a greater mass than the 5-newton ball, it will also have a greater momentum if their velocities are the same.

When both balls are released simultaneously from a point 50 meters above the Earth's surface, they will both experience the same downward acceleration. After 3 seconds of free fall, their velocities will be the same, as they have fallen for the same amount of time.

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Answer:

DANG :/ IM TOO LATE

Explanation:

Answer:

Explanation: Unbalanced Equation;

Na³SO⁴+PbCl²=NaCl+ Pb³(SO⁴)²

Balanced Equation:

2(Na³SO⁴) +3PbCl²=6NaCl+Pb³(SO⁴)²

Mole ratio:2:3=6:1

Molar mass of Na³SO⁴=3×(23)+32+(4×16)

= 69+32+64

= 69+96=165g/mol

No. of moles in 84.05g of Na³SO⁴

=84.05/165

= 0.51 moles

Using the mole ratio, The number of NaCl moles=0.51×6/2

= 0.51×3

. = 1.53 moles

Mass of NaCl produced. = 1.53×23

= 35.19g

Answer:

The charge carried by each ion (oxidation state of each atom)

Explanation:

If we have an ionic compound and we want to write its formula, we must first know the magnitude of charge on each ion (shown as oxidation state of the atoms involved) because the magnitude of charge on each ion is eventually crisscrossed and gives the subscript (number of atoms) for each atom in the formula.

For instance, let us write the formula of calcium bromide. Ca has a charge of +2 while Br has a charge of -1. If we exchange the charges and ignore the signs such that the crisscrossed charges form subscripts we can now write; \(CaBr_{2}\).

Many bulk compounds with industrial use, such as sodium hydroxide and chlorine, are produced by an important process called sodium chloride electrolysis.

Electrolysis of sodium chloride:

Hydrogen gas, chlorine gas, and sodium hydroxide solution are the byproducts of the electrolysis of sodium chloride.

Hydrogen ions (H +) and hydroxide ions (OH -) are the two ions that are created in water. H+ ions are drawn to the cathode during the electrolysis of water, where they pick up electrons to create hydrogen gas. The oxygen gas is formed when OH-ions are drawn to the anode and lose their electrons.

In industrial manufacturing environments, large amounts of sodium chloride are utilised to create a variety of products. Sodium chloride is used in the production of plastic, paper, rubber, glass, chlorine, polyester, home bleach, soaps, detergents, and dyes.

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Answer:

Renewable resources include biomass energy (such as ethanol), hydropower, geothermal power, wind energy, and solar energy. Biomass refers to organic material from plants or animals.

so its false

Answer:

True

Explanation:

Material resources are materials found in the natural world that have practical use and value for humans. Material resources include wood, glass (which comes from sand), metals, edible plants, and plastics (which are made from natural chemicals). Renewable material resources, like glass, can be re-created easily.

Answer:

1, 4, 5 are the correct answers

Explanation:

Hope this helps! :D

Answer: Heyo Kenji Here! Here's your answer- In addition, since the external battery source is what drives the electrons through the circuit, the electrodes will match the positive and negative terminal of the battery. While the anode remains the site of oxidation, it becomes the positive terminal, and the cathode becomes the negative terminal.

Explanation: Hope this helps!

Have a nice day!
- Kenji ^^

Answer: In a galvanic (voltaic) cell, the anode is considered negative and the cathode is considered positive. This seems reasonable as the anode is the source of electrons and cathode is where the electrons flow. However, in an electrolytic cell, the anode is taken to be positive while the cathode is now negative.

Explanation: I hope this helps!

Answer:

D

Explanation:

cracks from temperature changes is a type of physical weathering often known as freezing and thawing

Answer:

Inertia in our body tends to be in the situation it is. So, we a car comes to a halt, our body wants to keep moving i.e. in motion. hope that helps love!

Answer:

C21H2802

Explanation:

C=12g/mol

H=1g/mol

O=16g/mol

Part (C) of compound-80.18%

(0.8018 x 312)/12=21

Part (H) of compound-8.97%

(0.897 x 312)/1=28

Part (O) of compund-10.3%

(0.103 x 312)/16 = 2

Therefore the emp. formula is C12H28O2

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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When using acids and bases, note that these substances are corrosive. Make every effort to avoid contact with skin, eyes, and clothing. Be sure to wipe up any spills immediately.

Acids and bases are corrosive substances, which means they can cause damage to living tissues and other materials they come into contact with. Therefore, it is essential to take precautions when handling them.

Firstly, it is important to avoid any contact with skin, eyes, and clothing. If you do come into contact with an acid or base, immediately rinse the affected area with plenty of water for at least 15 minutes and seek medical attention if necessary.

Secondly, any spills should be cleaned up immediately to prevent further damage or harm. You should wear appropriate protective equipment, such as gloves and safety goggles, when handling these substances to reduce the risk of exposure.

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Answer:

sodium bicarbonate solution

Answer:

what is the quetion.......

Explanation:

The galvanic cell is powered by the reduction of manganese dioxide (MnO2) and the oxidation of iron (Fe).

The given redox reaction represents the power source of a galvanic cell. The reaction is as follows:

MnO2(s) + 4H+(aq) + 2Fe(s) → Mn2+(aq) + 2H2O(l) + 2Fe2+(aq)

In a galvanic cell, chemical reactions occur to convert chemical energy into electrical energy. The redox reaction mentioned represents the underlying mechanism that powers the cell.

On the left side of the reaction, we have solid manganese dioxide (MnO2), four hydrogen ions (H+) in aqueous solution, and solid iron (Fe). On the right side, we have manganese ions (Mn2+) in the solution, water molecules (H2O), and iron(II) ions (Fe2+) in the solution.

The half-reaction involving the reduction of MnO2 can be written as follows:

MnO2(s) + 2H+(aq) + 2e- → Mn2+(aq) + H2O(l)

In this half-reaction, MnO2 gains two electrons (2e-) and is reduced to Mn2+, while two hydrogen ions (2H+) combine with the electrons and produce water (H2O). This reduction process occurs at the cathode (the positive electrode) in the galvanic cell.

The other half-reaction involves the oxidation of iron (Fe) and can be represented as:

Fe(s) → Fe2+(aq) + 2e-

In this half-reaction, solid iron loses two electrons (2e-) and is oxidized to form iron(II) ions (Fe2+). This oxidation process occurs at the anode (the negative electrode) in the galvanic cell.

During the cell operation, the electrons released by the oxidation of iron (Fe) at the anode flow through an external circuit to the cathode. This electron flow generates an electric current that can be used to power external devices. The reduction of manganese dioxide (MnO2) at the cathode consumes these electrons, completing the electron transfer process.

The given redox reaction represents the functioning of a galvanic cell, where manganese dioxide is reduced at the cathode while iron is oxidized at the anode. This flow of electrons generates electrical energy in the cell. The reaction produces manganese ions in the solution and water molecules as byproducts.

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The ion-product expression for barium phosphate (Ba₃(PO₄)₂) is Ksp = [Ba₂⁺]³ [PO₄³⁻]².

The ion-product expression, also known as the solubility product constant, represents the equilibrium condition for the dissolution or precipitation of an ionic compound in a solution. For barium phosphate (Ba³(PO₄)²), the ion-product expression can be written as follows:

Ksp = [Ba₂⁺]³ [PO₄³⁻]²

In this expression, [Ba₂⁺] represents the concentration of barium ions [Ba₂⁺] in the solution, and [PO₄³⁻] represents the concentration of phosphate ions [PO₄³⁻] in the solution.

The exponent of 3 for [Ba₂⁺] signifies that three barium ions are involved in the formation of one unit of barium phosphate. Similarly, the exponent of 2 for [PO₄³⁻] indicates that two phosphate ions are required for the formation of one unit of barium phosphate.

The value of the solubility product constant (Ksp) represents the equilibrium constant for the dissolution or precipitation of barium phosphate. It indicates the product of the ion concentrations at equilibrium and remains constant at a given temperature.

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The concept Planck's quantum theory of radiation is used here to determine the frequency and energy associated with the photons. The frequency is 1.95 × 10¹⁸ Hz  and energy is 1.29 × 10⁻¹⁵ J. The correct option is A.

The Planck's quantum theory of radiation explains that the energy of radiation absorbed or emitted is directly proportional to the frequency of the radiation. The energy is absorbed or emitted in the form of electromagnetic radiation called quantum.

The equation is:

E = hν

E = h × c / λ

= 6.63 × 10⁻³⁴ J.s × 3.00 × 10⁸ m/s / 0.154 × 10⁻⁹ m

= 1.29 × 10⁻¹⁵ J

ν = E / h

1.29 × 10⁻¹⁵ J / 6.63 × 10⁻³⁴ J.s

= 1.95 × 10¹⁸ Hz

Thus the correct option is A.

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