1. Describe four ways in which enthalpy changes for a reaction may be represented.

2. Use the four methods to represent the dissolving of sodium chloride (Delta H sol = 3.9 kJ/mol).

Answer:

1.CBr4

2.CIF

Explanation:

Covalent compound are formed by sharing of electron and ionic compound formed by complete transfer of electron. The chemical formula for Carbon tetrabromide is CBr₄ and for Chlorine monofluoride is ClF.

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

Ionic compounds are more stronger than covalent compound. Ionic compounds have higher melting and boiling point than covalent compounds.

The chemical formula for Carbon tetrabromide is CBr₄, tetra means four. The chemical formula for Chlorine monofluoride is ClF, mono means one.

Therefore, the chemical formula for Carbon tetrabromide is CBr₄ and for  Chlorine monofluoride is ClF.

To learn more about chemical compound, here:

https://brainly.com/question/26487468

#SPJ2

Answer:

gene is the basic unit of hereditary,found in the chromosome transfered from parent to offspring

Answer: 19.4 mL Ba(OH)2

Explanation:

H2(g) + Cl2(g) --> 2HCl(aq) (make sure this equation is balanced first)

At STP, 1 mol gas = 22.4 L gas. Use this conversion factor to convert the 100. mL of Cl2 to moles.

0.100 L Cl2 • (1 mol / 22.4 L) = 0.00446 mol Cl2

Use the mole ratio of 2 mol HCl for every 1 mol Cl2 to find moles of HCl produced.

0.00446 mol Cl2 • (2 mol HCl / 1 mol Cl2) = 0.00892 mol HCl

HCl is a strong acid and Ba(OH)2 is a strong base so both will completely ionize to release H+ and OH- respectively. You need 0.00892 mol OH- to neutralize all of the HCl. Note that one mole of Ba(OH)2 contains 2 moles of OH-.

0.00892 mol OH- • (1 mol Ba(OH)2 / 2 mol OH-) • (1 L Ba(OH)2 / 0.230 M Ba(OH)2) = 0.0194 L = 19.4 mL Ba(OH)2

The image depicts the initial atoms when calcium and sulfur form an ionic compound is the third number image. Therefore, option C is correct.

The term an ionic compound is defined as compounds consist of ions that create charged particles when an atom or group of atoms gains or loses electrons.

A cation is an ion charged positively, and an anion is an ion charged negatively.

When calcium atom and sulphur atom reacts there is formation of an ionic compound. In the compound calcium sulphide, Ca acts as a cation, and S acts as an anion.

Thus, option C is correct.

To learn more about an ionic compound, follow the link;

brainly.com/question/9167977

#SPJ1

4 moles of nitrogen monoxide gas used to form 72.0 grams of water vapor.

A mole is the measurement unit which is used to correlate the molar mass with number of molecules present.

The equation for reaction of Nitrogen monoxide to form water vapor is given by

4NH₃ + 6NO ----> 5N₂ + 6H₂O

72 grams of water vapor means = 72/18 = 4 mole of water vapour

The mole fraction of NO to H₂O is 6 : 6

Therefore for 4 moles of water vapor formation , 4 moles of nitrogen monoxide will be required.

To know more about mole

https://brainly.com/question/26416088

#SPJ1

The population of shrimp would likely decrease if the number of crabs increases.

Shrimp and crabs often have a predator-prey relationship in their natural habitats. When the population of crabs increases, it can lead to an increase in predation pressure on shrimp. As a result, the shrimp population may decrease. Crabs are known to feed on shrimp, and an increase in the number of crabs means more predation on the shrimp population.

The increase in the crab population can have several effects on shrimp. Firstly, the increased predation pressure can directly lead to a higher mortality rate among shrimp, reducing their population size. Secondly, the presence of more crabs may also affect the behavior and distribution of shrimp. Shrimp may alter their feeding and reproductive patterns, potentially leading to reduced survival and reproduction rates.

Additionally, competition for resources such as food and habitat can intensify with an increase in crab population. This competition can further impact the shrimp population, limiting their access to vital resources and contributing to population decline.

Overall, an increase in the crab population is likely to have a negative impact on the population of shrimp, leading to a decrease in their numbers.

Learn more about predator-prey relationship here:

https://brainly.com/question/12527452

#SPJ11

Answer:

you will have to use T = 1/10

Answer:

anatomical position is the answer

Answer:

P2 = 0.95atm

Explanation:

Using Gay Lussac's equation as follows

P1/T1 = P2/T2

Where;

P1 = initial pressure

T1 = initial temperature

P2 = final pressure

T2 = final temperature

According to the information provided in this question; P1 = 1.00atm, T1 = 120°C, P2 = ?, T2 = 100°C

We need to convert temperature in °C to K

T1 (K) = 120°C + 273K = 393K

T2 (K) = 100°C + 273K = 373K

Hence;

P1/T1 = P2/T2

1.00/393 = P2/373

373 × 1 = 393 × P2

373 = 393P2

P2 = 373/393

P2 = 0.949

P2 = 0.95atm

Answer:

whats the question even ??/?

Explanation:

When an electron moves from a higher energy level to a lower energy level in an atom is called: electronic transition.

The jumping of the electron from  the one energy level to the another is called as the electronic transition.  When the electron moves from the high energy level to the lower one the atom emits the photon. A photon is the discrete amount of the light energy. The energy of the photon is same as the exact energy that will be lost by the electron that is moving to its the lower energy level.

When the electron drops from the higher energy level to the low energy level, then the energy is emitted in the form of the photon.

To learn more about electron here

https://brainly.com/question/11245569

#SPJ4

The final temperature of the calorimeter contents is approximately 42.9824°C.

To calculate the final temperature of the calorimeter contents, we consider the heat absorbed by the water and the calorimeter components.

First, let's calculate the heat absorbed by the water:

q_water = m_water * C_water * ΔT_water

q_water = 986 g * 4.18 J/g°C * (T_final - 21.48°C)

Next, let's calculate the heat absorbed by the calorimeter components:

q_calorimeter = C_calorimeter * ΔT_calorimeter

q_calorimeter = 6.66 kJ/°C * (T_final - 21.48°C)

Since the total heat absorbed is the sum of the heat absorbed by the water and the calorimeter components:

q_total = q_water + q_calorimeter

Now we can equate the total heat absorbed to the heat released by the combustion of benzoic acid:

q_total = -26.42 kJ/g * 1.104 g

By setting these two equations equal to each other, we can solve for the final temperature (T_final). We have:

986 g * 4.18 J/g°C * (T_final - 21.48°C) + 6.66 kJ/°C * (T_final - 21.48°C) = -26.42 kJ/g * 1.104 g

Simplifying and solving the equation will give us the value of T_final, which represents the final temperature of the calorimeter contents.

986 g * 4.18 J/g°C * (T_final - 21.48°C) + 6.66 kJ/°C * (T_final - 21.48°C) = -26.42 kJ/g * 1.104 g

Simplifying the equation:

4122.68 * (T_final - 21.48) + 6.66 * (T_final - 21.48) = -29.15568

4122.68T_final  - 88721.58 + 6.66T_final  - 143.5028 = -29.15568

4133.34T_final  - 88865.0828 = -29.15568

4133.34T_final  = 88835.92712

T_final  ≈ 21.48 + (88835.92712 / 4133.34)

T_final  ≈ 21.48 + 21.5024

T_final  ≈ 42.9824

Therefore, the final temperature of the calorimeter contents is approximately 42.9824°C.

To learn more about bomb calorimeter, here

https://brainly.com/question/27828855

#SPJ4

Answer: owa owa

Explanation: owa owa owa owa

Robert Millikan was the scientist who discovered the exact charge of an electron. Millikan's oil drop experiment was used to determine the charge of an electron.

The experiment was conducted using a charged oil droplet and an electric field. Millikan's oil drop experiment was also used to calculate the mass of an electron.

The mass of an electron was determined using the charge of an electron, which was determined using the oil drop experiment.The mass of an electron, or the electron's charge-to-mass ratio, was determined using the oil drop experiment, which calculated the velocity of the falling oil droplet. It is possible to determine the size of the electrical force and gravitational force acting on the oil droplet by measuring the velocity of its fall using the oil drop experiment.

The mass of the electron can be calculated using the formula m= q / f where, m is the mass of the electron, q is the charge of the electron, and f is the force.

To learn more about charge visit;

https://brainly.com/question/13871705

#SPJ11

Separating anthracene from benzoic acid via an extraction between ethyl acetate and a basic aqueous solution in a separatory funnel. you recover the anthracene would be recovered by the  collecting the top layer, and then dry with Na₂SO₄  and then evaporate the solvent.

The anthracene and the benzoic acid both are acidic so it is not possible to sperate both normally. so,  we would sperate it from ethyl acetate and a basic aqueous solution and then dry it with Na₂SO₄ , so that it can absorbed the benzoic acid.

Thus, Separating anthracene from benzoic acid via an extraction between ethyl acetate and a basic aqueous solution in a separatory funnel. you recover the anthracene would be recovered by the  collecting the top layer, and then dry with Na₂SO₄  and then evaporate the solvent.

To learn more about anthracene here

https://brainly.com/question/13854734

#SPJ4

The gauge pressure of the oxygen in the tank in atmospheres is 11.46 atm.

The gauge pressure is given as the pressure relative to the ambient atmospheric pressure. The gauge pressure can be calculated as:

Gauge pressure = System pressure - Atmospheric pressure

The system pressure of the 35-liter tank with 18.3 moles oxygen is given as:

Pressure = moles * Rydberg constant * Temperature / Volume

Pressure = 18.3 moles * 0.08 L.atm.mol⁻¹.K⁻¹ * 298 K / 35 L

Pressure = 12.46 atm

The standard pressure is given as 1 atm.

Thus, the gauge pressure of the oxygen in the tank can be:

Gauge pressure = System pressure - Atmospheric pressure

Gauge pressure = 12.46 atm - 1 atm

Gauge pressure = 11.46 atm

The gauge pressure of the oxygen in the tank in atmospheres is 11.46 atm.

Learn more about gauge pressure, here:

https://brainly.com/question/15734722

#SPJ1

Answer:

The answer is 8.31 atm.

Explanation:

Ideal Gas Law = PV = nRT
(where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.)

First, convert the temperature from Celsius to Kelvin:

25°C + 273.15 = 298.15 K

Next, plug in the known values into the Ideal Gas Law equation:

P * 35.0 L = 18.3 moles * 8.31 J/mol*K * 298.15 K

Finally, solve for P:

P = (18.3 moles * 8.31 J/mol*K * 298.15 K) / 35.0 L

The pressure is in units of joules per liter. To convert it to atmospheres, divide by the atmospheric pressure in joules per liter:

1 atm = 101,325 Pa = 101,325 J/m^3 = 101.325 kPa

P (in atm) = (18.3 moles * 8.31 J/mol*K * 298.15 K) / (35.0 L * 101.325 kPa)

= 8.31 atm

Answer:

The answer will be Number C that is positively and part of the nucleus

Answer:

Part C best describes a proton, as it is positively charged and part on the nucleus

Answer:

Bbbbb eg2020

Explanation:

Bbbbb

Explanation:

The nucleus of an atom is surround by electrons that occupy shells, or orbitals of varying energy levels. The ground state of an electron, the energy level it normally occupies, is the state of lowest energy for that electron. There is also a maximum energy that each electron can have and still be part of its atom.

Answer:

Washing your hands with lemon juice does not have any beneficial effects.

Explanation:

washing with lemon juice does not protect against any major diseases.

1.67 mM is the substrate concentration when this enzyme operates at one‑quarter of its maximum rate.

It is given that the km of enzyme is 5.0 mM.

Enzyme is a protein based molecule that increase the rate of the given chemical reaction.

The conncetion in the middle of substrate and rate of reaction is calculated by the Michaelis-Menten Equation.

V = Vmax[S] / Km + [S]

where, V is initial velocity Km is measure of affinity and S is substrate concentration.

V = 0.25 [5.0] / 1/4 [5.0]

V =1.67

We apply one quarter in the given equation and the answer would be 1.67 mM

To know more about Michaelis-Menten Equation here :

https://brainly.com/question/20912949?referrer=searchResults

#SPJ4

Federal Marshals will receive trafficking penalty for attempting smuggling.

Human trafficking, also referred to as trafficking in persons, is a crime that entails forcing or coercing a person to perform work or services or engage in sexual acts for monetary gain. The exertion of pressure may be covert or obvious, physical or psychological.

A conviction for keeping someone in servitude carries potential fines and a maximum 20-year prison sentence in a federal facility. The maximum penalty is life in prison if there is a death as a result of the violation or if it involved kidnapping, sexual assault, or other aggravating circumstances.

To know more about trafficking penalty visit:

https://brainly.com/question/14449916

#SPJ1

Answer:

b. contains only valence electrons.

Explanation:

In Lewis dot diagram valence electrons are shown by the dots around the symbol of an atom. Consider the example of sodium fluoride.

Electron dot diagram is attached below.

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

According to unit conversion, 65.2 mg is 0.0652×10⁻³ pg, 1.25×10⁴ is 12.5 km , 95 seconds is 0.0264 hours, 37 mg is 37×10⁻⁵ kg.

Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.

It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.

As 1 g =1000 mg thus 65.2 mg= 0.0652×10⁻³ pg,1 km=1000 m thus 1.25×10⁴ /1000=12.5 km, 1 hour =3600 seconds thus 95 seconds 95/3600=0.026 hours, 1 kg = 10000 mg thus 37 mg=37×10⁻⁵ kg.

Learn more about unit conversion,here:

https://brainly.com/question/28600662

#SPJ1

When both parents shared different traits either it will be heterogeneous or homogenous traits,in that case offspring traits neither belongs to parents.However,chances are very that traits of children neither belongs to parents.

Unaffected parents can create impacted offsprings assuming that the two guardians are transporters (heterozygous) for the attribute being followed in the family. Latent traits are normally not communicated in each age. Finally, guys and females are similarly prone to communicate a latently acquired characteristic.

In the event that the latent characteristic is more than prevailing, the recessive traits will really become predominant and the predominant attribute will become recessive.Recessive alleles are meant by a lowercase letter (a versus A). Just people with an aa genotype will communicate a latent characteristic; consequently, posterity should get one passive allele from each parent to display a latent traits.

To know more about traits,visit here:

https://brainly.com/question/16307346

#SPJ4

In fact, sodium, potassium, or ammonium sulfates enhance ligand-protein interactions in HIC while also stabilizing protein structure. As a result, the most prevalent ions are (NH4)2SO4, Na2SO4, NaCl, KCl, and CH3COONH4. Figure 1 depicts how various salts can influence selectivity. The highest resolution of four standard proteins was achieved by starting with 1.7 M ammonium sulfate.

Because each salt has a different capacity to encourage hydrophobic interactions, selecting a salt for an HIC separation can be a trial and error process. When the concentration of a salt rises, the quantity of protein bound increases almost linearly up to a certain salt concentration and then exponentially at greater concentrations.When compared to other salts, ammonium sulfate often provides the greatest clarity at a particular concentration and can be used at ratios up to 2 M.

When using sodium chloride, concentrations of up to 3 M are typically needed.

Although sodium sulfate is an excellent salting-out substance, issues with protein solubility may preclude its use at high amounts.

Working with ammonium sulfate at pH levels above 8.0 is not advised.

Answer:

The answer to the question is 148.3 g

Explanation:

To find moles, you want to get rid of the grams by finding molar mass. Then, you have to get rid of grams using cross multiplication. This is why 148.3 grams is on the bottom; it will get rid of the grams on the original amount leaving you moles.

a.) At 40°C, the values of [\(H^+\)] and [\(OH^-\)] in pure water are [\(H^+\)] = 1.71×\(10^{-7}\) M and [\(OH^-\)] = 1.70×\(10^{-7}\) M, respectively.

b.) The pH of pure water at 40°C is 6.77.

c.) If the [\(OH^-\)] concentration is 0.18 M, the pH of the solution is 12.79.

The value of Kw (the ion product constant for water) at 40°C is 2.92×\(10^{-14}\).

a) Since pure water is neutral, [\(H^+\)][\(OH^-\)] = Kw. Therefore, we can find [\(H^+\)] and [\(OH^-\)] as follows:

[\(H^+\)][\(OH^-\)] = Kw

\([H^+]^2\) = Kw = Kw

[\(H^+\)] = (\(\sqrt{Kw}\)) = (\(\sqrt{2.92\times10^{-7}}\) = 1.71×\(10^{-7}\) M

[\(OH^-\)] = Kw/[\(H^+\)] = 2.92× / 1.71×\(10^{-7}\) M = 1.70×\(10^{-7}\) M

Therefore, the values of [\(H^+\)] and [\(OH^-\)] in pure water at 40°C are [\(H^+\)] = 1.71×\(10^{-7}\) M and [\(OH^-\)] = 1.70×\(10^{-7}\) M.

b) The pH is defined as the negative logarithm of the hydrogen ion concentration, pH = -log[\(H^+\)]. Therefore, we can find the pH of pure water at 40°C as follows:

pH = -log[\(H^+\)] = -log(1.71×\(10^{-7}\)) = 6.77

Therefore, the pH of pure water at 40°C is 6.77.

c) If [\(OH^-\)] = 0.18 M, we can find [\(H^+\)] as follows:

[\(H^+\)][\(OH^-\)]= Kw

[\(H^+\)] = Kw/[\(OH^-\)] = 2.92×\(10^{-14}\) / 0.18 M = 1.62×\(10^{-13}\) M

The pH is then:

pH = -log[\(H^+\)] = -log(1.62×\(10^{-13}\)) = 12.79

Therefore, the pH of the solution with [\(OH^-\)] = 0.18 M is 12.79.

Learn  more about pH here:

https://brainly.com/question/491373

#SPJ11