PLEASE HELP ASAP!!!
P-3 has how many electrons?
-15
-12
-18
-none of these

Answer:

There are 0.0305 calories in 0.128 joules

Explanation:

Given that,

Heat absorbed, Q = 0.128 J

We need to find the heat energy absorbed in calories.

We know that the relation between joules and calories is as follows :

1 calorie = 4.184 J

1 J = (1/4.184) J

So,

\(0.128\ J=\dfrac{0.128 }{4.184}\\\\=0.0305\ cal\)

So, there are 0.0305 calories in 0.128 joules

Answer:

false

Explanation:

Answer:

light

Explanation:

Have a nice day

Answer:

light

Explanation:

The possible molecular formula of the compound is C3H6.

What is molecular formula?

The  molecular formula is an expression of  that defines the number of the  atoms of each element in one of the  molecule of a compound. It is  shows the actual number of each atom in a molecule.

Sol-

Let's take the mass weight of compound= 42g

As per the given question

The empirical formula is CH2.

Empirical weight of CH2 = 12 + (1 × 2) = 12 + 2 = 14

Mass of one mole of the compound = its molecular weight = 42

n = Mol. wt. / Empirical formula wt.= 42 / 14 = 3

So,Mol. formula = ( Empirical formula) × n

Thus the answer is

= (CH2) × 3 = C3H6

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Beans are processed through 'nibbing'. During the nibbing process, the roasted cocoa beans are crushed and ground into a paste called cocoa mass or cocoa liquor.

This cocoa mass can then be further processed to separate the cocoa solids from the cocoa butter, which is the fat component of the cocoa bean. The separated cocoa solids and cocoa butter are used in the production of chocolate. Pure cocoa mass (cocoa paste) in solid or semi-solid form is known as chocolate liquor. It includes about equal amounts of cocoa butter and solid cocoa, much like the cocoa beans (nibs) from which it is made. It is made from fermented, dried, roasted, and separated from their skins cocoa beans. To make cocoa mass (cocoa paste), the beans are pulverised.

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To prepare a calibration curve, a set of solutions with a range of precisely known analyte concentrations must be used, and option (C) is correct.

A calibration curve is used to determine the concentration of unknown samples based on the relationship between the measured signal and the analyte's concentration. Calibration curves are prepared using a set of solutions with a range of precisely known analyte concentrations.

What is a calibration curve? A calibration curve is a graph displaying the relationship between an instrument's measurements and the concentration of a substance in the sample being analyzed.

Concentration, in most cases, is plotted on the x-axis, while the signal obtained from the instrument is plotted on the y-axis. The resulting curve is called the calibration curve.

The aim of calibrating an instrument is to establish a relationship between the measurement and the actual concentration of the analyte in the sample.

The set of solutions with a range of precisely known analyte concentrations are used to prepare a calibration curve. Calibration curve is an essential part of analytical chemistry and used to determine the concentration of unknown samples based on the relationship between the measured signal and the analyte's concentration.

Therefore, option C is correct.

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Answer:

B, a neutral group

Explanation:

Answer:

B

Explanation:

From the concept of electrolysis, 34.6632 grams of Cr would plate out from a solution of Cr(NO3)3 when 1.93 × 10^5 coulombs of charge are passed through the solution.

Electrolytic reaction is a process in which electrical energy is used to drive a non-spontaneous chemical reaction. It is used to extract metals from their ores that cannot be obtained by the reduction with carbon. The process involves electrolysis where the electrolyte is a solution containing ions of the metal to be extracted. The metal ions are reduced by electrons from the electrical circuit onto the cathode, forming a solid metal.

Molar mass of Cr = 52.00 u

The equation for the reduction of Cr3+ ions is given as follows: Cr3+ + 3e- → Cr

We can see from the equation that it takes 3 moles of electrons to plate out 1 mole of Cr. Therefore, the number of moles of electrons needed to plate out Cr can be calculated as follows:

Number of moles of electrons = 1.93 × 10^5 / 96500 = 1.9997 mol

We can use the mole ratio of Cr to electrons to find out how many moles of Cr would be plated out. Number of moles of Cr = Number of moles of electrons / Mole ratio of Cr to electrons. Number of moles of Cr = 1.9997 / 3 = 0.6666 mol. We can use the following formula to calculate the mass of Cr that would be plated out:

Mass = Number of moles × Molar mass

          = 0.6666 × 52.00

          = 34.6632 g.

Therefore, approximately 34.6632 grams of Cr would plate out from a solution of Cr (NO3)3 when 1.93 × 10^5 coulombs of charge are passed through the solution.

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Answer:

The coefficient of aluminum nitrate is 2.

Explanation:

The reaction between aluminum nitrate and calcium phosphite is:

Al(NO₃)₃ + CaHPO₃ → Al₂(HPO₃)₃ + Ca(NO₃)₂  

Now, we need to balance the equation. Let's begin with phosphite anion. On the reactant side we have 1 molecule of the anion, and on the products side we have 3 of it, so we need to add a coefficient of 3 before CaHPO₃:

Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + Ca(NO₃)₂

The number of Ca atoms on the reactants side is now 3 and on the products side is 1, so we need to add a coefficient of 3 as follows:

Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + 3Ca(NO₃)₂  

The reactants side has 1 atom of Al, and the products side has 2. Let's add a coefficient of 2 on the reactant side:

2Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + 3Ca(NO₃)₂  

Finally, the nitrate anion has 6 molecules on the reactant side, which is equal to the number of molecules of NO₃⁻ on the product side.

Hence, in the balanced equation, we have a coefficient of 2 in aluminum nitrate.

I hope it helps you!

Answer:

The pH of the solution is basic

Explanation:

as one of the characteristics of the base is to increase the OH concentration in a solution so if the solution has low concentration of OH this means that the solution is basic

Positive ions are formed by atoms or molecules suffering an inelastic collision with an energetic electron in which an electron is lost from the atom or molecule (electron impact ionization). The degree of ionization of the plasma depends strongly on the electron density and energy distribution in the gas.

Using the half-life of Am-241, its molar mass and the mass of the sample, we can calculate that it will release 3.57 x 10¹¹ α-particles each second.

Am-241 has a half-life of 432 years, therefore in that time, we will have half of the initial amount, which is:

3.89 g / 2 = 1.945 g

The number of moles (n) in 1.945 g may be calculated using the molar mass of Am-241 (241 g/mol):

n = m/M = 1.945 g / 241 g/mol = 8.07 x 10⁻³ mol

We will emit the following over a period of 432 years because each mol contains 6.022 x10²³ particles:

8.07 x10⁻³ x6.022 x10²³ = 4.86 x10² α-particles

We can now determine how many seconds there are in 432 years:

432 yearsx 365.25 days x24 hours x 60 minutes x 60 seconds = 1.36 x 10¹⁰ seconds

As a result, the Am-241 sample will release once every second:

4.86 x10²¹ / 1.36 x 10¹⁰ = 3.57 x 10¹¹ α-particles

Your question is incomplete but most probably your full question was

Americium-241 is widely used in smoke detectors. the radiation released by this element ionizes particles that are then detected by a charged-particle collector. the half-life of 241am is 432 years, and it decays by emitting alpha particles. how many alpha particles are emitted each second by a 3.89-g sample of 241am?

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Explanation:

Newtons third law states for every action (force) in nature there is an equal and opposite reaction

Answer:

yeah someone explain

Explanation:

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Answer:

A heat exchanger is device which is designed to transfer heat from one matter to another. In nuclear power plants, these heat exchangers are used to pass heat from primary system to the secondary system. In the process they produce steam from water, they are also called steam generators or pressurized water reactors.

Answer:

an oxide

Explanation:

A just took the quiz on edg

The formation of oxide as  product will most likely be observed in a combustion reaction.

A combustion reaction was a reaction where a substance combines with oxygen gas to produce energy in term of light as well as heat.

Chemical compounds called oxides include one or even more oxygen atoms including another element.

When propane is burned in the air, carbon dioxide, as well as water, is produced.

Therefore, the correct answer will be option (A).

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Answer:

10 atm.

Explanation:

Using the combined gas law equation as follows;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (atm)

P2 = final pressure (atm)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question,

P1 = 5 atm

P2 = ?

V1 = 4L

V2 = 2L

T1 = 25°C = 25 + 273 = 298K

T2 = 25°C = 298K

Using P1V1/T1 = P2V2/T2

5 × 4/298 = P2 × 2/298

20/298 = 2P2/298

Cross multiply

298 × 20 = 298 × 2P2

5960 = 596P2

P2 = 5960 ÷ 596

P2 = 10 atm.

Rapid breathing pays back the oxygen debt by breaking down lactic acid. creatine glycogen oxygen glucose.

Even after exercise must be finished, the "oxygen debt" could be paid when laborious breathing and an elevated heart rate were needed to eliminate lactic acid and replenish depleted energy stores.

The oxygen debt would be the quantity of oxygen needed to replenish the body's oxygen stores and remove the lactic acid. It can take anywhere between a few hours for little activity and several days after just a marathon when an individual has been exercising to start repaying an oxygen debt.

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Answer:

'Red shift' is a key concept for astronomers. The term can be understood literally - the wavelength of the light is stretched, so the light is seen as 'shifted' towards the red part of the spectrum.

Something similar happens to sound waves when a source of sound moves relative to an observer. This effect is called the 'Doppler effect' after Christian Andreas Doppler, an Austrian mathematician who discovered that the frequency of sound waves changes if the source of sound and the observer are moving relative to each other.

If the two are approaching, then the frequency heard by the observer is higher; if they move away from each other, the frequency heard is lower.

There are many everyday examples of the Doppler effect - the changing pitch of police and ambulance sirens, or train whistles and racing car engines as they pass by. In every case, there is an audible change in pitch as the source approaches and then passes an observer.

Everyone has heard the increased pitch of an approaching police siren and the sharp decrease in pitch as the siren passes by and recedes. The effect arises because the sound waves arrive at the listener's ear closer together as the source approaches, and further apart as it recedes.

Light behaves like a wave, so light from a luminous object undergoes a Doppler-like shift if the source is moving relative to us. Ever since 1929, when Edwin Hubble discovered that the Universe is expanding, we have known that most other galaxies are moving away from us. Light from these galaxies is shifted to longer (and this means redder) wavelengths - in other words, it is 'red-shifted'.

Since light travels at such a great speed relative to everyday phenomena (a million times faster than sound) we do not experience this red shift in our daily lives.

The red shift of a distant galaxy or quasar is easily measured by comparing its spectrum with a reference laboratory spectrum. Atomic emission and absorption lines occur at well-known wavelengths. By measuring the location of these lines in astronomical spectra, astronomers can determine the red shift of the receding sources.

However, to be accurate, the red shifts observed in distant objects are not exactly due to the Doppler phenomenon, but are rather a result of the expansion of the Universe.

Doppler shifts arise from the relative motion of source and observer through space, whereas astronomical redshifts are 'expansion redshifts' due to the expansion of space itself.

Two objects can actually be stationary in space and still experience a red shift if the intervening space itself is expanding.

A convenient analogy for the expansion of the Universe is a loaf of unbaked raisin bread. The raisins are at rest relative to one another in the dough before it is placed in the oven. As the bread rises, it also expands, making the space between the raisins increase.

If the raisins could see, they would observe that all the other raisins were moving away from them although they themselves were stationary within the loaf. Only the dough - their 'Universe' - is expanding.

CO₂, CH₄, and H₂O are known as greenhouse gases because they absorb and trap heat from the sun in the Earth's atmosphere.

When sunlight hits the Earth, it warms the surface, and some of that heat is radiated back into space. However, greenhouse gases absorb this outgoing heat, which causes it to be trapped in the atmosphere, resulting in the warming of the Earth's surface.

CO₂ is the most significant greenhouse gas and is produced primarily by the burning of fossil fuels. Methane (CH₄) is another potent greenhouse gas and is mainly produced by agricultural activities and the decomposition of organic waste. Water vapor (H₂O) is also a potent greenhouse gas but is naturally occurring and is produced mainly through evaporation from bodies of water.

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A separating funnel can separate two immiscible liquids, oil and water. Because oil and water are fully insoluble in one other, they split into two distinct layers. The upper layer is made up of oil, whereas the lower layer is made up of water.

Or you could simply remove the oil layer from the top by pouring it into another vessel, which leaves you with the water layer at the bottom.

Answer:

same

Explanation:

the first answer is correct

The process of gasification that occurs without the chemical decomposition of the molecules is pyrolysis.

Pyrolysis is the process of heating substances especially organic materials in absence of oxygen as oxygen is not involved combustion does not occur rather a biomass thermally decomposes into combustible gases and other products.

when condensed fuel such as a candle or pool of gasoline burns the heat produced makes them convert into smaller fragments in absence of air through the application of heat.

The heat produced is responsible for gasification and responsible for thermal combustion without the usage of oxygen making them remain than combustion over oxygen which ensures complete decomposition.

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IUPAC is the nomenclature approach used for naming compounds. The compounds are ethane, butane, and butene.

IUPAC is the nomenclature method of the organic compounds that are universal and is recommended by the International union so that the names of the same chemical species are constant and ubiquitous all over.

The first compound has a single bond and two carbons hence ethane, the second compound has a single bond and four carbons and hence butane, and the third compound has one double bond and four carbon atoms and hence butene.

Therefore, the compounds are ethane, butane, and butene.

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Answer:

B

Explanation:

Answer:

B

Explanation:

The higher the energy level of the collision, the more likely it is above the activation energy, increasing the rate of the reaction. Of course, you cannot go too far or the collision would not be effective and no reaction would occur.

More collisions per second increases the rate of the reaction too, so the reaction is faster

The effective nuclear charge of sulfur is 14, and the effective nuclear charge of chlorine is 15.

Effective nuclear charge (Zeff) is a measure of the positive charge felt by the valence electrons. The effective nuclear charge (Zeff) of s and Cl is calculated using the simple formula zeff = z – s, where z is the atomic number and s is the screening constant. Screening constant (s) is the number of electrons between the nucleus and the valence electrons that shield the valence electrons from the full nuclear charge of the nucleus.

For sulfur (S), the atomic number is 16, and there are two electrons in the innermost shell and four electrons in the second shell. So, the number of valence electrons in sulfur is 6. The screening constant of S is 2. Effective nuclear charge of sulfur = z – s= 16 - 2= 14

For chlorine (Cl), the atomic number is 17, and there are two electrons in the innermost shell and eight electrons in the second shell and seven valence electrons. Therefore, the screening constant of Cl is 2. Effective nuclear charge of chlorine = z – s= 17 - 2= 15

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The reaction is endothermic because the temperature dropped from  28 degrees Celsius to  20 degrees Celsius.

An endothermic reaction is one in which heat is absorbed from the surrounding resulting in decrease in temperature while an exothermic reaction is one in which heat is evolved causing the temperature to rise.

In the particular context of this question, the reaction is endothermic because the temperature dropped from 28 degrees Celsius to 20 degrees Celsius. The heat in the surroundings decreased.

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The addition of 0.90 M NaF to a saturated CdF₂ solution would decrease the solubility of CdF₂.

A saturated solution is a solution that contains the highest amount of solute that can be dissolved in a given amount of solvent at a given temperature and pressure.

Solubility refers to the maximum amount of solute  that can dissolve in a given quantity of solvent at a specified temperature and pressure. The solubility of a substance is generally determined in terms of the number of grams of solute that can dissolve in 100 g of solvent. Solubility is expressed in grams of solute per 100 grams of solvent, while molarity is expressed in moles of solute per liter of solution.

A saturated solution of CdF₂ would be prepared using water as a solvent. If we add NaF to this saturated CdF₂ solution, the solubility of CdF₂ will be reduced, because NaF is a fluoride-containing salt. The concentration of F⁻ ions in the solution will be raised as a result of the addition of NaF. As a result, the equilibrium of the reaction below will shift to the left: 2CdF₂(s) ⇌ 2Cd⁺(aq) + 4F⁻(aq)

Ksp = [Cd2⁺]² [F⁻ ]⁴

The reduction of F² ions will drive the reaction to the left, thus the equilibrium will be moved to the left. This reduces the solubility of CdF₂ in the solution, because the concentration of Cd2⁺ will decrease. Therefore, the solubility of CdF₂ will decrease if 0.90 M NaF is added to the saturated solution.

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Answer:

i have done this before

Explanation:

the bag just starts shrinking after sparkling a little bit