In fluorescence spectroscopy, why is the wavelength of the emitted radiation longer than the wavelength of the radiation used for excitation of the analyte?

Answer:

oxygen and energy in the form of sugar.

Explanation:

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Answer:

Density, \(d=2.09\ g/cm^3\)

Explanation:

Given that,

Mass of a flask is 450 g

Volume of benzene added to the flask is 145 mL or 145 cm³

The weight of the flask and benzene is found to be 754 g.

We need to find the density of the benzene.

Weight of benzene added = total weight of flask and benzene-mass of flask

m = 754 g - 450 g

m = 304 g

Density = mass/volume

So,

\(d=\dfrac{304\ g}{145\ cm^3}\\\\d=2.09\ g/cm^3\)

So, the density of the benzene is \(2.09\ g/cm^3\).

Polar bonds do not always result in polar molecules; for example, carbon dioxide has polar bonds but is a nonpolar molecule because its bond polarities cancel out due to its linear geometry.

The statement that all molecules with polar bonds are polar molecules is not entirely correct. While it is true that polar bonds occur between atoms with different electronegativities, giving rise to partial positive and negative charges within the molecule, a molecule can still be nonpolar if the polar bonds cancel out each other's effects.

For example, carbon dioxide has two polar bonds between the carbon atom and each oxygen atom, but the molecule is nonpolar because the arrangement of the atoms is linear, with the polar bonds facing in opposite directions and canceling each other's effect. Similarly, tetrachloromethane has four polar bonds between the carbon atom and each chlorine atom, but the molecule is nonpolar due to its tetrahedral geometry, which results in the polar bonds being arranged symmetrically around the carbon atom.

Therefore, it is essential to consider both the electronegativity difference and the geometry of the molecule to determine whether a molecule is polar or nonpolar.

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Answer:

yes true

Explanation:

both are heterogeneous

Answer: The number of protons in the nucleus of the atom is equal to the atomic number . The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom is equal to the sum of the number of protons and neutrons in the nucleus.

The mass of an element is the sum of number of neutrons and protons in the atom. The number of electrons and protons in an atom is same and from the mass number number of neutrons can be calculated.

Mass number of an element is the sum of the number of protons and electrons in an atom. Electrons are negatively charged particles revolving around the nucleus and protons are positively charged particles. Neutrons are neutral and have no charge.

An atom in its neutral state contains equal number of electrons and protons. This number is called its atomic number. All the positive charges are neutralized with equal number of negative charges.

Now let's take an example of nitrogen, with atomic number 7. Nitrogen contains 7 electrons and 7 protons. Its mass number is 14. Thus number of neutrons is 14- 7  =7.

If we have mass number only and the atomic number is known  lets say 13 and 24 respectively. Then number of electrons is  12 and the same for protons and number neutrons is 24 - 13 =11.

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Ground glass joints are widely used in laboratories for connecting glassware components in various experimental setups. These joints are characterized by their size and taper, which are represented by two numbers, separated by a forward slash (e.g., 24/40).

The first number (e.g., 24) refers to the diameter of the joint in millimeters, representing the widest point of the ground glass surface. This ensures that components with the same diameter can be connected securely and seamlessly. The second number (e.g., 40) indicates the taper of the joint, or the length over which the diameter changes, measured in millimeters per 10 centimeters. This ensures that the components can be connected properly, creating a tight seal while still allowing for easy assembly and disassembly.
In summary, the numbers associated with ground glass joints help to identify and match the correct components by specifying their diameter and taper, ensuring that laboratory glassware can be connected securely and efficiently.

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The ratio for [C\(_5\)H\(_5\)N]/[C\(_5\)H\(_5\)NH⁺] if the solution has the following pH values 4.50 is 6.30.

A buffer is indeed a solution that resists pH fluctuations and contains either a weak acid as well as its salt or perhaps a weak base as well as its salt. To put it another way, a buffer is indeed an aqueous solution that includes a weak base as well as its conjugate acid, or a weak acid as well as its conjugate base.

A buffer may also be referred to as a buffer solution, hydrogen ion buffer, and pH buffer.

pOH =PKb+log[salt]/[base]

pOH =14-pH= 14-4.50=9.5

pKb= -logKb

     =-log(1.7×10⁻⁷)

     =8.7

9.5 =8.7+log[salt]/[base]

9.5 -8.7=log[salt]/[base]

0.8=log[salt]/[base]

[salt]/[base] =10^0.8=6.30

[C\(_5\)H\(_5\)N]/[C\(_5\)H\(_5\)NH⁺]=6.30

Therefore, 6.30 is the value for [C\(_5\)H\(_5\)N]/[C\(_5\)H\(_5\)NH⁺].

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When a lump of uranium is broken into smaller pieces, the total surface area of the lump increases. This is because the surface area of an object is directly proportional to its size.

The smaller the size of an object, the greater the surface area it has in relation to its volume. Therefore, breaking a lump of uranium into smaller pieces will increase the total surface area of the uranium, which in turn increases the likelihood of the uranium reacting with other substances. This is an important consideration in nuclear reactions, where the surface area of the uranium plays a key role in controlling the rate of the reaction. When a lump of uranium is broken into smaller pieces, the total surface area increases. This occurs because each new piece exposes additional surfaces that were previously inside the original lump. As a result, the combined surface area of all the smaller pieces is greater than that of the initial lump. This principle applies to any material, not just uranium. Increasing surface area can affect properties such as reactivity, heat transfer, and dissolution rate, making this phenomenon important in various applications and processes.

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Answer:

it takes place only at extremely night temperatures

Explanation:

I looked it up

Answer:

In nature, fusion reactions take place in the Sun and other stars.

Explanation:

Edmentum sample answer!!

The Scientific notation to decimal number , 4 × 10⁻⁵ cm = 0.00004 cm

given data as follows :

scientific notation number = 4 × 10⁻⁵ cm

to convert it in decimal for as :

4 × 10⁻⁵ cm = 4 × 1 / 10⁵ cm

4 × 10⁻⁵ cm = 4 × 1 / 100000 cm

4 × 10⁻⁵ cm  = 4 × 0.00001 cm

4 × 10⁻⁵ cm =  0.00004 cm

so, the conversion of scientific notation to decimal form is given as :  4 × 10⁻⁵ cm = 0.00004 cm. scientific notation is the way of expressing long form to short form and decimal is long form.

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Answer:

Electron dot diagram is attached below

Explanation:

Sodium is alkali metal and present in group one. It has one valence electron. All alkali metal form salt when react with halogens.

Sodium loses its one electron to get stable.  While all halogens have seven valence electrons they need only one electron to get stable electronic configuration.

When alkali metals such as sodium react with halogen fluorine it loses its one valence electron which is accepted by fluorine and ionic bond is formed. The compound formed is called sodium fluoride.

Na + F   →   NaF

In cross and dot diagram electrons of one atom are shown as dots while other atom shown as cross to distinguish.

Electron dot diagram is attached below.

Answer with Explanation:

A "chemical change" occurs when the structure of the molecules change. If there's no change in structure, it is called a "physical change." This also means that a chemical reaction has to occur for something to be considered a chemical change.

Gasoline when used as a fuel is being transformed into other forms of energy. It undergoes a process called "combustion."

When used as a fuel for cars, the gasoline is being burned to produce heat energy. This energy is then converted into mechanical energy that allows the car to move. Clearly, the gasoline has undergone a chemical change.

The plastic container is likely to impact the integrity of the evidence i.e. a sample of DNA based on this storage method.

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The freezing point of the solution is -11.8 °C.

The boiling point of the solution is 103.31 °C.

To determine the freezing point of the solution, we can use the equation:

ΔTf = Kf * m

where:

ΔTf is the freezing point depression,

Kf is the cryoscopic constant (for water, Kf = 1.86 °C/m),

m is the molality of the solution (moles of solute per kilogram of solvent).

First, let's calculate the molality (m) of the solution:

Molar mass of ethylene glycol (C2H6O2):

C = 12.01 g/mol

H = 1.01 g/mol (x 6) = 6.06 g/mol

O = 16.00 g/mol (x 2) = 32.00 g/mol

Total molar mass = 12.01 g/mol + 6.06 g/mol + 32.00 g/mol = 50.07 g/mol

Number of moles of ethylene glycol (C2H6O2) = mass / molar mass

Number of moles = 30.8 g / 50.07 g/mol = 0.615 mol

Mass of water = volume x density = 96.6 mL x 1.00 g/mL = 96.6 g

Now, let's calculate the molality:

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

Molality = 0.615 mol / 0.0966 kg = 6.36 mol/kg

Now we can calculate the freezing point depression (ΔTf):

ΔTf = Kf * m

ΔTf = 1.86 °C/m * 6.36 mol/kg = 11.8 °C

To find the freezing point of the solution, subtract the freezing point depression from the freezing point of pure water (0 °C):

Freezing point = 0 °C - 11.8 °C = -11.8 °C

To determine the boiling point of the solution, we can use the equation:

ΔTb = Kb * m

where:

ΔTb is the boiling point elevation,

Kb is the ebullioscopic constant (for water, Kb = 0.52 °C/m),

m is the molality of the solution (same value as calculated before: 6.36 mol/kg).

ΔTb = 0.52 °C/m * 6.36 mol/kg = 3.31 °C

To find the boiling point of the solution, add the boiling point elevation to the boiling point of pure water (100 °C):

Boiling point = 100 °C + 3.31 °C = 103.31 °C

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The Lucas Test is used to detect the presence of a primary alcohol.

When the test is positive, the mixture of the primary alcohol with the Lucas reagent changes from a clear and colourless characteristic to a turbid, cloudy, and hazy characteristic. This visual change is due to the reaction of the primary alcohol with the Lucas reagent which is a mixture of concentrated hydrochloric acid and zinc chloride.

The Lucas Test is used to detect the presence of a primary alcohol, and when a positive result is obtained, the reaction of the primary alcohol with the Lucas reagent, a mixture of hydrochloric acid and zinc chloride, causes the visual change from a clear and colourless characteristic to a turbid, cloudy, and hazy one.

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Answer:

Gas, Solid, or liquid

Explanation:

Answer:

concrete

Explanation:

because it is simply a variety of calcium compounds in a single mixture. when mixed with water and solid substances , it become concrete.

Answer:

salt

Explanation:

Concrete is a heterogeneous mixture.Wood is a heterogeneous mixture.Granite is a heterogeneous mixture.

Constitutional isomerism is a type of isomerism in which molecules have the same atoms, but the order in which the atoms are bonded is different. They can have the same molecular formula but different functional groups

The members of the following set of compounds are all alcohols:

2-Butanol

3-Methyl-1-pentanol

2-Methyl-2-butanol

Pentan-1-ol

2-Methyl-1-butanol

1-Pentanol

Therefore, we must recognize the structural formula that represents the same compound and the one that represents constitutional isomers of each other.The constitutional isomers are

2-Methyl-1-butanol, 3-Methyl-1-pentanol, and 2-Methyl-2-butanol.

The following two pairs of alcohols represent the same compound:

2-Butanol and Pentan-1-ol.

Their structural formulas contain five carbon atoms.

1-Pentanol and 3-Methyl-1-pentanol. They contain five carbon atoms and are primary alcohols as well.Each alcohol has its own unique structural formula that separates it from other compounds. Isomers are compounds that have the same chemical formula but differ in structure, and this includes constitutional isomers.Therefore, the structural formulas that represent the same compound are Pentan-1-ol and 2-Butanol. The structural formulas that represent constitutional isomers are 2-Methyl-1-butanol, 3-Methyl-1-pentanol, and 2-Methyl-2-butanol.

Constitutional isomers are compounds that have the same number and kind of atoms, but the atoms are connected differently.

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To achieve a temperature close to -15 °C for cooling the reaction mixture, the best cooling method would be an acetone/dry ice bath or a liquid nitrogen bath.

The temperature required for cooling the reaction mixture to -15 °C is quite low and may not be easily achieved using common methods like an ice water bath or an ice/NaCl bath. These methods typically reach temperatures around 0 °C or slightly below freezing.

An acetone/dry ice bath is a suitable cooling method as the combination of acetone and dry ice can reach temperatures as low as -78 °C. This temperature range is sufficient to cool the reaction mixture to -15 °C effectively.

Alternatively, a liquid nitrogen bath is another excellent option. Liquid nitrogen has an extremely low boiling point of -196 °C, making it capable of achieving and maintaining temperatures well below -15 °C.

Setting the reaction in a freezer may not be the best option as the temperature control in a standard freezer may not reach the desired -15 °C, and there could be limited space or other factors that might affect the reaction conditions. Therefore, an acetone/dry ice bath or a liquid nitrogen bath would be the preferred cooling methods for achieving a temperature close to -15 °C.

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Answer:

y = 2.77 cm

Answer: The third dimension is 2.77 cm

Answer:

down

Explanation:

Answer

(a) F

Pole Star is a star in the galaxy and hence not a part of the solar system.

(b) T

Mercury is the smallest planet in the solar system and Jupiter is the largest planet in the solar system.

(c) T

Uranus is the farthest planet to the sun in the solar system and Mercury is the closest planet to the earth in the solar system.

(d) T

INSAT or Indian National Satellite System is a series of artificial Indian satellites used for telecommunications, meteorology and search and rescue operations.

(e) F

There are eight planets in the solar system. They are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Note the pluto is considered as a dwarf planet.

(f) F

Orion can be seen with naked eyes. It is one of the most magnificent constellations in the sky. It has seven or eight bright stars. Orion is also called the Hunter

In this exercise, we have to use our knowledge of astronomy to identify the correct alternatives, so we find that:

1)C

2)B

3)A

4)B

5)D

6)C

Then, based on astronomy knowledge, we can identify that the true alternatives correspond to:

1)A meteor happen a streak of light above bring into being by a meteor superlative through Earth's general feeling or mood.

2)Meteoroids exist lumps of rock or iron that revolution the brightest star, just as celestial body orbiting a star, asteroids, and comets act.

3)A coma happen the fuzzy-anticipate glow that maybe visualize situated on sides the head of a comet.

4)Halley's Comet, that happen 8 kilometres (5 miles) expansive and 16 km long, travels around the Sun each 75 to 76 age in an lengthened circuit.

5)Shooting stars exist existent what astronomers call meteors. Most meteors upset fashionable the gases around the earth before they reach the ground.

6)The celestial body orbiting a star belt happen a torus-form domain in the Solar System, situated about middle from two points the orbits of the celestial body orbiting a star Jupiter and Mars.

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When we have a chemical reaction, the speed of the reaction will depend on different factors such as concentration, temperature, or pressure.

If we assume that the temperature and pressure remain constant, it will be the concentration that will determine the rate of reaction for a non-zero order reaction.

If the concentration of the reactants decreases, the reaction rate also decreases, therefore, if the reactants are depleted, the reaction rate decreases.

Answer: D. The rate of the reaction slows down.

Answer:

No

Explanation:

Petroleum cant be mixed with water coz petroleum is less dense than water so petroleum will float on water.

Answer:

No

Explanation:

Liquid water is held together by hydrogen bonds. (Liquid water has fewer hydrogen bonds than ice.) Oils and fats not have any polar part and so for them to dissolve in water they would have to break some of water's hydrogen bonds. Water will not do this so the oil is forced to stay separate from the water.

Answer:

what do you need help with?

Explanation:

Answer:

Hello brainly user! You did not provide a question for us to help you with! In order for someone to help you, you need to provide the question you are in need of help for. What's your question?

Answer:

8,300

Explanation:

925*9 is 8325.

After you round to the nearest hundred, its 8,300.

Answer:

Explanation:

eggggggggggg