How much energy is emitted by 9.4 mg of sodium atoms emitting light at a wavelength of 5.8E-7 m? Answer in units of J.

Try 35% ethyl acetate to see the substance present in it is more polar ,which on increasing the concentration of ethyl acetate to give a second spot.

The acetate ester produced when acetic acid and ethanol react is termed as ethyl acetate. It functions as an EC 3.4.19.3 (pyro glutamyl-peptidase I) regulator, a metabolite, and a Saccharomyces cerevisiae metabolite in addition to being a polar aprotic solvent. It is a volatile organic chemical, an ethyl ester, and an acetate ester.

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The complete question is :

You use 25% ethyl acetate (an ester) in hexane to run a tlc and obtain a single round spot with an Rf of 0.9 for the main compound. What would you do?

Answer:

4.the identity of a genetic disease presenting symptoms

Explanation:

The capacity of a liquid is measured in metric units of volume called litres and millilitres.

A crucial component of measurement is unit conversion, which is done using the appropriate quantity conversion factor.

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C-H sp2 and C=C double bond stretching bonds will disappear.

The examination of infrared light's interactions with molecules is known as infrared spectroscopy. It's frequently utilized to find numerous bonds and functional groups in both organic and inorganic compounds.

Each compound has a distinctive light absorption area that acts as its unique fingerprint. It can be used to identify functional groups in a molecule because the majority of them exhibit absorption bands in this range (400-1400cm-1).

This method can be used to evaluate whether the addition reaction of bromine (Br2) with 1-pentene has completed because the spectral bands for the C-H sp2 and C=C bonds will vanish.

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Cobalt-60 is composed of 27 protons, 33 neutrons, and 27 electrons.

Atom which is heavy   have more neutrons than protons, but the number of electrons in an atom is always equal to the number of protons in an atom. So an atom  is electrically neutral.

Electrons are  negative as they behave in an electric field. In an electric field, an electron will move from the negative pole to the positive pole , by convention it  becomes a negative charge.

Electrons are atomic particle with a negative charge. Protons are atomic particle with a positive charge. Protons are bind together in an atom's nucleus because of strong nu-cleric force.Neutrons are the atomic particles which are neutrally charged.

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The correct answer is d) none of these. Hexokinase is catalyzed to produce glycolysis.

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Precipitate-forming reactions would be most appropriate for identifying the presence of whether an element is present in the solution.

In a precipitation reaction, dissolved chemicals will get combined to form one or more solid products. These kinds of reactions, which are also known as double displacement, double replacement, or metathesis reactions which are frequently taken place through the aqueous solutions and involved in the exchange of ions between ionic compounds.

Through the precipitation reactions, the presence of element will be confirmed and analyzed. The presence of lead in water sources could be checked by adding the chemical and looking for the appearance of a precipitation whether it should be at instant , and the chemical combines with lead to generate a precipitate.

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The rate increases by a factor of 4.  IF the rate of the reaction  concentration of both 1-bromo butane and sodium hydroxide were doubled

What is meant by rate of reaction?

The rate of reaction refers to the speed at which the products are formed from the reactants in a chemical reaction.The reaction rate or rate of reaction is that the speed at which a chemical reaction takes place, defined as proportional to the rise in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time. Reaction rates can vary dramatically

Why is rate of reaction important?

The rate of a reaction is a powerful diagnostic tool. By checking out how fast products are made and what causes reactions to slow down we can develop methods to improve production. This information is important for the large scale manufacture of many chemicals including fertilizers, drugs and household cleaning items.

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The density of aluminum 2.7 g/cm3 in kilograms per cubic meter is  2700 [tex]kg/m^{3}[/tex] .

A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. The formula for density is mass divided by volume:

ρ = M/V

where m is the mass and V is the volume.

The kilogramme is equal to one gramme divided by one thousand.

So, (2.7/1)×(1000000/1000)

= 2700 [tex]kg/m^{3}[/tex]

Therefore, the density of aluminum 2.7 g/cm3 in kilograms per cubic meter is  2700 [tex]kg/m^{3}[/tex] .

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The mass of the sample is 18.3g

The total amount of matter in a physical body is known as mass. This property also measures inertia, or the body's resistance to acceleration (change of velocity) when a net force is applied. The mass of an object also affects the gravitational attraction it exerts on other bodies.

The kilogram is the fundamental mass unit of SI (kg). Although mass is frequently established by measuring an object's weight on a spring scale rather than a balancing scale and directly comparing it with known masses, mass and weight are not the same things in physics. Although there is less gravity on the moon than there is on Earth, an object would nonetheless have the same mass.

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a. acetic acid = CH3COOH

b. silver carbonate = Ag2CO3

c. copper(ii) sulfate = CuSO4

d. dinitrogen monoxide = N2O

e. xenon trisulfide = XeS3

What is chemical formula?

An element's chemical symbol and the proportionate number of atoms it contains are used to identify each constituent element in a chemical formula. These proportions are determined by empirical formulae that begin with a key element and then assign atom counts to the other parts of the compound in relation to the key ingredient.

A chemical formula is a representation of a compound's constituent elements and their relative proportions.

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Each photon of this light has 1.06x10^-19 energy.

A tiny electromagnetic radiation energy bundle is known as a photon or light quantum. The idea was first put forth by Albert Einstein in his explanation of the photoelectric effect in 1905, in which he suggested that discrete energy packets might be present during the transmission of light. Heat radiation is released and absorbed in separate units, or quanta, as explained earlier by the German physicist Max Planck in the year 1900.

While all photons move at the same speed, their energies range from high-energy gamma rays and X-rays to low-energy infrared and radio waves. A concentration of photons that have been manufactured to travel collectively in order to simultaneously strike their target is what gives lasers their incredible power.

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The emission of carbon dioxide and carbon monoxide constitute carbon emissions.

The term carbon emissions has to do with the ways in which carbon could be introduced into the environment. We know that carbon is a very important component of pollution as it is contained in fossil fuels which are often burnt to release energy to drive civilization.

Hence the term carbon emissions include  the carbon dioxide and carbon monoxide in the atmosphere, produced by business processes and systems.

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The order to show the precipitation of halite from water are given below.

What is precipitation ?

Precipitation is the process of changing a dissolved substance from a super-saturated solution to an insoluble solid in an aqueous solution. Precipitate refers to the produced solid. The chemical agent that initiates the precipitation in an inorganic chemical process is referred to as the precipitant.

Step 1: Seawater starts to evaporate.

Step 2: Na cations and Cl anions concentrate as water molecules leave the liquid state and are left behind.

Step 3: Cl anions and Na cations move toward one another and start to bind.

Step 4: The resulting NaCl pairs join and start to form a crystal of halite, an ordered structure.

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Question:

Rank the following in order to show the precipitation of halite from water. Place the first event at the top and the last event at the bottom.

The compound Trinitroglycerin is a molecular compound

The compound Trinitroglycerin is basically used as an explosive. It could decompose following the equation;

a) [tex]4C_{3} H_{5} N_{3} O_{9} (l)--- > 12CO_{2} (g) + 10H_{2} O(g) + 6N_{2} (g) + O_{2} (g)[/tex]

b) We can see that the decomposition of the compound Trinitroglycerin produces -1541.4 kJ/mol of energy hence 1541.4 kJ/mol is the enthalpy of formation of the compound.

c) Number of moles in 0.6 mg of the compound = 0.6 * 10^-3 g/227 g/mol

= 2.6 * 10^-6 moles

If 4 mole of the compound produces 1541.4 kJ of heat

2.6 * 10^-6 moles of the compound produces  2.6 * 10^-6 moles * 1541.4 kJ/4 mole

= 1 * 10^-3 kJ or 1 J

If 1 Cal = 4.184 J

x = 1 J

x = 0.24 cal

d) The compound is a molecular compound

e) When trinitroglycerin is used as an explosive to break rockfaces in highway construction, chemical energy is converted to heat, light, sound and mechanical energy.

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The pH of a 205 ml sample is 1.58.

Balanced chemical eqation for benzoic acid release proton in water:

C₆H₅COOH(aq) ⇄ C₆H₅COO⁻(aq) + H⁺(aq)

V(C₆H₅COOH) = 205 mL; volume of benzoic acid

c(C₆H₅COOH) = 2.668 M; concentration of benzoic acid

Ka = 6.4 x 10-5; acid constant of benzoic acid

c(C₆H₅COO⁻) = c(H⁺) = x; unknown concentration

Ka = (c(C₆H₅COO⁻) x c(H⁺)) / c(C₆H₅COOH)

6.4 x 10-5 = x² / 2.668 M - x

x² + (6.4 x 10-5)x - 1.7 x 10⁻⁴ = 0

Solve for x, using quadratic formula:

x = c(H⁺) = 0.026 M

pH = -logc(H⁺)

pH = -log0.026

pH = 1.58

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Hydrogen chloride gas and oxygen react to form water vapor and chlorine gas.

What is Hydrogen chloride?

A hydrogen halide is the substance hydrogen chloride, which has the chemical formula HCl. It is a colourless gas at room temperature that reacts with water vapour in the air to produce white fumes of hydrochloric acid. In technology and industry, hydrochloric acid and hydrogen chloride gas are crucial. The formula HCl is also frequently used to refer to hydrochloric acid, an aqueous solution of hydrogen chloride.

4.75 litres of water would be created as a result of this process.

Given: HCl gas volume = 9.5 L

The chemical process will be balanced if:

4HCl + O2 → 2H2O + 2Cl2

As we are aware, 1 mole of gas at STP occupies 22.4 L of gas.

According to the stoichiometry, 4 litres of HCl gas react to produce 2 litres of chlorine.

As a result, 9.5 litres of HCl gas react to produce 9.5*2/4 litres of Cl.

Therefore, 4.75 litres of Cl would be created by this process.

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The electrons of every lithium atoms in the container have a combined negative electric charge of 8.96 × 10⁶ C

We have 3 moles of electrons (e⁻) in 1 mol of Li, so the quantity of negative electric charge is:

hence

negative electric charges =  3 × 31 × 6.022 × 10²³ × 1.60 × 10⁻¹⁹

negative electric charges = 8.96 × 10⁶ C

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The purposes of the aqueous sodium bisulfite solution that is added during the workup of the bromination reaction remove moisture from organic layers To scavenge excess bromine in the reaction mixture To remove byproducts None of the above. The reaction between ethyl chloride and magnesium followed by addition to benzaldehyde belongs to the Grignard reaction category.

What is an aqueous sodium bisulfite solution?

This salt of bisulfite is often prepared by bubbling sulfur dioxide in a solution of sodium carbonate in water. Sodium bisulfite in touch with chlorine bleach (aqueous solution of sodium hypochlorite) will generate heat and form sodium bisulfate and sodium chloride.

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Homogenous mixture - a cup of tea and sugar, food coloring dissolved in water.

Heterogenous mixture - a bucket full of sand and gravel, peanut and almond mixed together in a bowl.

Mixtures are substances that are made up of 2 or more substances mixed together.

Mixtures can be homogenous if the component substances are uniformly distributed. If the components are skewed to a particular side or are not uniformly distributed, such a mixture is said to be heterogeneous.

A homogenous mixture is attained when a solute completely dissolves in a solvent. If the solute is partially or totally insoluble, a heterogeneous mixture results.

In the same vein, a solid-solid mixture cannot be homogenous.

Thus:

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Buffer range of Na₂HPO₄/Na₃PO₄ is 10.9 to 12.9

using Henderson hasselbach equation:

pH = pKa + log₁₀ ([A⁻]/ [HA])

By this equation we can find out the buffer range

Given,

pH of given buffer is 11.9

Ka₁= 7.5 x 10⁻³

Ka₂= 6.2x 10⁻⁸

Ka₃= 4.8 x 10⁻¹³

so by Henderson hasselbach equation buffer range is 10.9 to 12.9

Therefore, correct option is (b)

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(a) When electrons are in their lowest energy state, we say that they are in _________.

(b) Sometimes, when ________ energy such as ________ or electricity is applied to the atom, the electrons absorb energy and transition to an _________ state.

(c) The electrons can not sustain this higher energy state for so long, so eventually ________ occurs.

(d) As a result, the electrons release energy in the form of a ______ and return back to ____.

(e) The jump between the high energy state to a lower energy state is called a _________.

(a) Ground State

(b) higher energy , excited state

(c) unstability

(d) light , ground state

(e) excited state absorption

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Answer:

b) no change; an increase

Explanation:

Kinetic energy does not change but potential energy increases at melting point.

Driving instruction can be assisted by using computer simulations of the steering wheel, brakes, and gas pedal. The car's response is predicted by computer models after the controls detect the applied forces. This model has the benefit of simulating how the car turns when the steering wheel is rotated in various directions.

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To obtain pH 8, multiply the [H+] concentration at pH 6 by 0.01

From the question given above, the following data were obtained:

pH = –Log [H+]

8 = –Log [H+]

Multiply through by –1

–8 = Log [H+]

Take the anti-log of –8

[H+] = anti-log (–8)

[H+] = 1×10⁻⁸ M

pH = –Log [H+]

6 = –Log [H+]

Multiply through by –1

–6 = Log [H+]

Take the anti-log of –6

[H+] = anti-log (–6)

[H+] = 1×10⁻⁶ M

[H+] at pH 8 / [H+] at pH 6 = 1×10⁻⁸ / 1×10⁻⁶

[H+] at pH 8 / [H+] at pH 6 = 0.01

Cross multiply

[H+] at pH 8 = 0.01 × [H+] at pH 6

Thus, to obtain pH 8, multiply the [H+] at pH 6 by 0.01

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The molality of a 0.677 m ethanol ( c 2 h 5 o h ) solution whose density is 0.588 g/ml.

What is molality and molarity?

The number of solvent moles per kilogram is known as molality. Because the mass of the solute and solvent in the solution remains constant, molality is the preferred concentration transfer method.

Molarity, also referred to as molar concentration, is the quantity of a material expressed as moles per litre of solution. Solutions marked with a molar concentration have a capital M. One mole of solvent per litre is present in a 1.0 M solution.

Molar mass (w) of C2H5OH = 46g

Molarity(M) = 0.677M

Density(D) = 0.588g/mol

Molality(m) = M/D * (1000 + w*M)

= 1187.2m

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By ideal gas approximation, the temperature of methane gas is 110.71 K.

We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation

P . V = n . R . T

where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.

From the question above, we know that

V = 20 L = 0.02 m³

P = 92 kPa = 92 x 10³ Pa

n = 2 moles

By substituting the following parameters, we get

P . V = n . R . T

92 x 10³ . 0.02 = 2 . 8.31 . T

16.62T = 1840

T = 110.71 K

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Quantitative Qualitative

Male parrotfish 1.3 meters in length

Brain coral over 2 meters in circumference

Sea anemone tentacles have an average length of 7 cm

Qualitative

Angelfish has swirl patterns of black and white

Angelfish swimming in large schools

Male parrotfish has large scales and scar near base of

tail fin

Scar on parrotfish may have been caused by a bite from

another fish

Parrotfish is afraid of brain coral because the fish will

not touch the coral

Sea anemone have purple tipped tentacles

My hand brushed up against sea anemone tentacle and

it began to hurt

Most of the sand near the coral reef has been washed

away by the tide

Few divers visit this coral reef because there is no litter

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Answer:

32 degrees

Explanation:

Answer:

Water changes to Ice at 0 degree celcius

Explanation:

Hope it helps!!!

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