Draw the major product formed when hbr reacts with the epoxide. Use wedge–dash bonds, including hydrogen atoms at each stereogenic center, to show the stereochemistry of the product.

The heat (q) in kJ released with combustion of methanol using 801 grams of water and the change in temperature is 4.3 degree Celsius. the specific heat of water is 4.18 J/(g °C) is 14397.17 J.

given that :

The specific heat capacity is given as :

q = mc ΔT

where ,

m = mass = 801 g

c = specific heat capacity = 4.18 J/g °C

ΔT = change in temperature = 4.3  °C

q = heat = ?

now, by solving the values we get :

q = mc ΔT

q = 801 × 4.18 × 4.3

q = 14397.17 J

Thus, The heat (q) in kJ released with combustion of methanol using 801 grams of water and the change in temperature is 4.3 degree Celsius. the specific heat of water is 4.18 J/(g °C) is 14397.17 J.

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Answer:

reactivity, flammability,toxicity some more

Chemists employ the mole, a very significant unit of measurement. The initial SO3 concentration is 0.28 M.

A mole is defined as 6.02214076 1023 of a particular chemical unit, such as atoms, molecules, ions, or others. Because there are so many atoms, molecules, or other components in any compound, the mole is a useful quantity to utilize.

When an element's standard relative atomic mass is multiplied by the molar mass constant, 1 103 kg/mol = 1 g/mol, the result is the molar mass of its atoms.

An object's mass that comprises 6.023 x 1023 of that object's particles is referred to as a mole. The SI unit used to measure substance amounts is the mole. Molecule is its symbol. According to the definition, 1 mole of carbon-12 weighs 12 grams and has a carbon atom count of 6.022140857 x 1023.

2.50 L is the container's volume.

Initially, there were 0.700 moles.

first concentration of SO3 =0.700 moles /2.50 L

SO3 = 0.28 M

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448.142 mg was the initial mass (in mg) of the sample

What is half life ?

Half-life in radioactivity, the time interval required for half of the nuclei in a radioactive sample to decay (spontaneously converted to other types of nuclei by the release of particles and energy), or equivalently, the number of decays required Halve the amount of radioactive material per second of time interval.

For example, the radioisotope cobalt 60 used in radiotherapy has a half-life of 5.26 years. Therefore, after this interval, a sample that originally contained 8 g Cobalt-60 will only contain 4 g Cobalt-60 and emit half the amount of radiation. After another 5.26 year interval, the sample contains only 2 g of Cobalt-60. However, both the volume and the mass of the original sample are such that the unstable cobalt-60 nuclei decay into stable nickel-60 nuclei, leaving undecayed cobalt.

7/e^-4.1592 =448.142

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Answer:

Explanation:

Atoms emit light because excited electrons are returning to lower energy states, emitting the energy difference :- Bohr model. This energy always has a specific wavelength because the electrons can only exist in set orbits.

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Answer:

A.

Explanation:

A probe was sent to record the event

Option C. The character has a mass of 85. zero kg and weighs 305 N mercury is three.59 Venus is eight.87 Earth is 9. eighty-one mars three.77: C.earth

Earth is expected to be 4.54 billion years old, plus or minus about 50 million years. Scientists have scoured the Earth looking for the oldest rocks to radiometrically date. In northwestern Canada, they determined rocks approximately four.03 billion years vintage.

The earliest existence on earth might have been just as purple as its miles green nowadays, a scientist claims. ancient microbes might have used a molecule other than chlorophyll to harness the solar rays, one which gave the organisms a violet hue. The third planet from the sun, Earth is the handiest region in the acknowledged universe shown to host existence. With a radius of 3,959 miles, Earth is the 5th largest planet in our sun machine, and it's the handiest one regarded as positive to have liquid water on its floor. Earth is also unique in phrases of monikers.

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Answer:

a: 1.181grams of iodine are present in the sample of soluble iodide.

b: 76.44 percent iodine is the mass percentage of iodine when excess silver nitrate was added to precipitate all of the iodide ions

Explanation:

We know that when silver reacts with halides it forms precipitate, silver when reacts with iodine it forms a yellow coloured precipitate of silver iodide which is an inorganic compound soluble in water. One odd characteristic of silver iodide is that it is photosensitive and may form metallic/dark silver if exposed to light. One of the most renowned albeit controversial use of silver iodide is that it is used to generate rain through clouds

Ag+ (aqueous)+ I−(aqueous) →AgI(s) yellow precipitate

2.185g x  (1 mole of AgI / 234.77 AgI)  x (1 mole Iodine/1 mole AgI)  x (126g of Iodine/1 mole of I)

= 1.181g

b)Now, mass percentage can be obtained by using the following formula

mass percentage = mass of solute/mass of solution x 100

iodine mass percent = (mass of iodine/mass of soluble iodide) x 100

= (1.181/1.545) x 100 = 76.44 %

mass percentage is the mass of the element/solute divided by the mass of compound or solution ,then the result is multiplied to get the answer. It can be defined as the weight of solute in a particular weight of solution.

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If there are 0.2 M solutions of both acid and base, the concentrations of hydrogen and hydroxide ions will be equal at equivalence point.

The reaction of sulfuric acid and a basic solution BOH occurs as follows;

H2SO4(aq) + 2BOH(aq) -----> B2SO4(aq) + 2H2O(l)

In the question, we are told that that both the solution of the sulfuric acid and the basic solution are 0.2 M.

The point where all the hydrogen and hydroxide ions have reacted according to the stoichiometry of the reaction. If there is really equimolar amounts of acid and base, the concentration of hydrogen and hydroxide ions will be equal at equivalence point.

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Every substance might have its own unique properties. They can be of characteristic physical and chemical properties  by which they can be identified.

Physical properties of a substance include the properties related to its mass, volume, density its phase change etc. Various physical properties include density, conductivity, melting point, boiling point etc.

Chemical properties of a substance include its reactivity, bond type etc. The reactivity of each substance may vary based on their bond type and intermolecular force of attraction. Each substance shows different reactivity  towards air, water, with other metals and chemicals.

Similarly, the state of each substance it mostly exists will be different. Therefore, by determining the physical and chemical properties of the substance, we can identify the substance.

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Sodium metal (Na) has properties with lithium metal (Li) because the two metals are located in the same group, namely group IA.

All elements in group IA are included in the alkali metals, except hydrogen, because the character possessed by hydrogen is "different" and does not match the character of other alkali metals.

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The bigger the molar mass, the greater the entropy at room temperature. When looking at the state of matter of objects, entropy generally increases with increasing molecular complexity.

What is entropy ?

Entropy, a measure of a system's thermal energy per unit temperature not available for useful work. Work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder or randomness of a system. The concept of entropy gives us deep insight into the direction of spontaneous change in many everyday phenomena. Introduced in 1850 by German physicist Rudolf Clausius, it is the pinnacle of 19th-century physics.

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The order of the atomic radius is;  

1) Potassium, Aluminum, Carbon,  Oxygen

2)  Potassium, Aluminum, Carbon, Oxygen

We know that the atomic radius has to do with the distance between one atom and another in that are not covalently combined. We know that the atomic radius is a function of the group to which the atom belongs.

We know that the atomic radius increases down the group but would tend to decrease across the period as more shells are added to the atom of the element.

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The numerical coefficients in a balanced chemical process describe the species-mole ratio. This mole ratio is used to compare two species' chemical compositions.

Take into account the balanced reaction for ammonium perchlorate's breakdown:

2 → N₂ + Cl₂ + 4H₂O + 2O₂

We can see from the aforementioned reaction that the amount of ammonium perchlorate that will react and the amount of oxygen gas that will be created are equal. Using the molar mass of 117.49 g/mol to calculate the moles of ammonium perchlorate

moles NH₄ClO₄ = 4.4 g / (117.49 g/mol) = 0.03745 mol

moles O₂ = 0.03745 mol

The oxygen gas moles will then be converted to mass (molar mass = 32 g/mol).

mass O₂ = 0.03745 mol * 32 g/mol = 1.2 g.

Therefore, the mass of oxygen gas produced by the reaction of ammonium perchlorate is 1.2 grams.

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COMPLETE QUESTION:

Ammonium perchlorate, NH₄ClO₄, is the solid rocket fuel used by the U.S. Space Shuttle. It reacts with itself to produce nitrogen gas N₂, chlorine gas Cl₂, oxygen gas O₂, water H₂O, and a great deal of energy. What mass of oxygen gas is produced by the reaction of 4.4g of ammonium perchlorate?

The concentration molarity of NaCl is 3.76 mol/l.

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of solution.

Calculation:-

mass = 21.5 g

volume = 100 ml = 0.1 L

the molar mass of NaCl = 58.5

mole = mass/molar mass

         = 21.5 / 58.5

        = 0.376

concentration = mole /volume

                        = 0.376 / 0.1

                        = 3.76

The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.

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The future value of a single sum increases as the compound rate decreases.

Future value is the total amount received at a particular point in time if the initial investment and the interest earned on the initial investment are included.

Future value calculations are used for various accounting functions. The most common use is to understand how much money is in investment at a given point in time due to interest income.

The formula for the final value of the single sum is

              Future value = P ( 1 + i )n

where P is the principal amount

          i is the interest rate

          n is the number of years

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The molar mass of the gas samples must be known to find the greatest concentration of molecules.

What is a molar mass?

A substance's molar mass is its mass in grams per mole of the chemical. A mole measures a substance's quantity of atoms, molecules, or ions. A mole is 6.022  1023 molecules of any given chemical.

Molar Mass calculation formula

M=m/n

M= molar mass

m=mass of substances (in grams).

n= number of moles of a substance.

How is molar mass determined, and why is it important?

One mole of material is weighed to determine its molar mass. Add the masses of all the components in a molecule to determine the molecular mass of the molecule by multiplying the subscript (number of atoms) by the atomic mass of each element in the molecule.

Using the molar mass formula,

M= 12/4 = 3,

It can be determined that 3 moles (or 3*avogadro number of molecules) are present.

Hence we can conclude that option (a) is correct.

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Answer:

An atom changes from a ground state to an excited state by taking on energy from its surroundings in a process called absorption. The electron absorbs the energy and jumps to a higher energy level. In the reverse process, emission, the electron returns to the ground state by releasing the extra energy it absorbed.

Answer:

fermentation of crops that are high in sugar (starch) or fat into ethanol,

Explanation:

The copper bars and the surrounds would transfer energy energy be different if the bars were in an open system.

Systems that are isolated are ones whose energy is constant at all times. Heat is neither generated nor absorbed in isolated systems. An illustration of such an isolated system Thermos flasks are the ideal illustration of isolated systems. There is neither a gain nor a loss of energy because the thermally flask is completely insulated.

As a result, isothermal processes are not able to occur in closed systems. Q. In a thermodynamics cycle, the unit is in contact with an outside source of heat, and changes happen gradually to make regulating the temperature easier. An adiabatic process isolates the system.

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The correct answer is option D.

The statement that formed the basis of Dalton’s atomic theory is atoms are the smallest particles of matter and cannot be divided farther.

In 1808, Dalton presented a theory named atomic theory which suggests that atoms are the smallest particles of an element and it is impossible to divide them further.

According to his theory every element is composed of these tiny particles.

Furthermore, his theory suggests that atoms neither can be divided nor destroyed.

In a particular matter, for example gold, all atoms have similar properties while their mass varies for every single different element.

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The complete question is:

Which of these statements is one of the conclusions that formed the basis of Dalton’s atomic theory?

a. Atoms can only change into atoms of another element through nuclear reactions.

b. Atoms of gases have less mass than atoms of liquids and solids.

c. Atoms of a particular element all have the same number of protons.

d. Atoms are the smallest particles of matter and cannot be divided farther.

40.4 C

So far q(rxn) = q(water) + q(CaCl2) (136g)(4.184J/°Cg)(Tfinal - 25.0°C) = (125g)(4.184)(Tfinal - 25.0°c) + (11g)c(Tfinal - 25.0°C).

The specific heat capacity is measured in J/(kg K) or J/(kg °C), and it is the amount of heat (J) absorbed per unit mass (kg) of the material when its temperature rises by 1 K (or 1 °C).The average kinetic energy of the atoms or molecules in the system is measured by temperatures. The zeroth law of thermodynamics states that when two objects are in thermal equilibrium, no heat is transferred between them, resulting in an equalisation of their temperatures.

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The absorbance of the sample with 34.780 percent transmittance is 3.54

What is transmittance?

Transmittance is the fraction of the incident light which passes through the sample and comes out successfully. In spectrometer, the detector detects the amount of light coming out of the sample and converts the reading into digital display. Absorbance is the fraction of the light which is being absorbed by the given sample.

The absorbance of the sample is,

A = 2 - log (-% T)

where, A = absorbance, %T = transmittance

A = 2 - log (-34.780) = 2 - (-1.54) = 3.54

Therefore, the absorbance of the sample having 34.780 percentage transmittance is 3.54.

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PCL₅ is the empirical formula of the compound.

Phosphorous pentachloride is it's if empirical formula and molecular formula are assumed to be the same.

Empirical formula is the lowest relative ratios of atoms that are present in a molecule or compound. It shows the simplest ratio and not the actual number of atoms hence should not be confused with molecular formula.

quantity of phosphorus : 4.14g

quantity of white compound after combining with chlorine : 27.8g

therefore quantity of chlorine = 27.8g - 4.14g => 23.66g

Molecular weight of Phosphorus: 30.97g

Molecular weight of Chlorine: 35.45g

For no. of moles= given weight / molecular weight

Moles of phosphorus= 4.14g / 30.97 => 0.1337 moles

Moles of Chlorine= 23.66g / 35.45 => 0.6674 moles

For empirical formula, we divide with the smaller entity i.e. 0.1337

Phosphorus: 0.1337 / 0.1337 => 1

Chlorine: 0.6647 / 0.1337 => 5

hence the empirical formula is PCL₅

Name of the compound : Phosphorus pentachloride

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33× 10⁻⁷ A current is needed to plate 5g of Copper metal on a cathode.

It states that during electrolysis, the amount of chemical reactions occurring at the electrodes under the influence of electrical energy is proportional to the amount of electricity conducted through the electrolyte.

n = zFQ

Where, n = moles of copper metal

n = 5/63.54

n = 0.078 moles

z = Number of electrons in the half-cell reaction

Cu²⁺ + 2e⁻ ⇔ Cu

z = 2

F = Faraday constant (96,485 A/mol)

Now, substitute the values in the equation mentioned above:

0.078 = 2 × 96,485 × Q

Q = 4.04 × 10⁻⁷ C

Since Q = I × t

Where, Q = charge

I = Current

t = Time (2 hours or 120 min.)

4.04 × 10⁻⁷ C = I × 120

I = 4.04 × 10⁻⁷/120

I = 33× 10⁻⁷ A

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Answer:

nothing common dude

The frequency of electromagnetic waves with an energy of 9.89×10-18 J is 1.492 ×10^16 Hz.

What are electromagnetic waves?

These are the waves created due to the vibration caused between two fields, i.e., electric field and magnetic field.

In simple words, it originates from the oscillating magnetic and electric field.  The electromagnetic spectrum gives us a range of frequency, wavelength and Energies.

It is used to classify the electromagnetic waves and arrange them according to their order of frequencies and wavelength.

Frequency = Energy/ Planck's constant

f= E/h

h=6.626×10^-34 J s

⇒9.89×10^-18/6.626×10^-34

⇒1.492×10^16 Hz.

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the WASB has a slightly acidic equivalence point and SASB has a slightly basic equivalence point. This is because WASB has a higher concentration of hydronium ions than SASB.

Hydronium ions play an important role in acid-base reactions. It is the hydrogen ion that is released or taken up in the acid-base reaction. The higher the concentration of hydronium ions, the more acidic the solution. In an acid-base reaction, an acid donates a hydrogen ion to a base. Bases accept hydrogen ions. This creates new water molecules. The equivalence point is the point at which an acid and a base react with 1:1 ratio. At this point the solution is neutral. If the acid has a higher concentration of hydronium ions than the base, the equivalence point is slightly acidic. This is due to the presence of more hydronium ions than at the start of the reaction. If the base has a higher concentration of hydronium ions than the acid, the equivalence point is slightly basic.

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Answer:

i think its C i may be wrong...

Explanation: