Write a balanced half-reaction for the product that forms at each electrode in the aqueous electrolysis of the following salts: (a) ZnBr₂;

Answer:

Alchemy was based more on experimentation and had little basis in science. Chemistry utilizes both experimentation and scientific practices. Modern chemistry basically relies on scientific theories and experimental results, but the alchemy was a blend of myths, religion, magic, astrology, philosophy, and spirituality.

Answer:

Substances can change phase—often because of a temperature change. At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous.

The process of a solid becoming a liquid is called melting. (an older term that you may see sometimes is fusion). The opposite process, a liquid becoming a solid, is called solidification. For any pure substance, the temperature at which melting occurs—known as the melting point—is a characteristic of that substance. It requires energy for a solid to melt into a liquid. Every pure substance has a certain amount of energy it needs to change from a solid to a liquid. This amount is called the enthalpy of fusion (or heat of fusion) of the substance, represented as ΔHfus. Some ΔHfus values are listed in Table 10.2 “Enthalpies of Fusion for Various Substances”; it is assumed that these values are for the melting point of the substance. Note that the unit of ΔHfus is kilojoules per mole, so we need to know the quantity of material to know how much energy is involved. The ΔHfus is always tabulated as a positive number. However, it can be used for both the melting and the solidification processes as long as you keep in mind that melting is always endothermic (so ΔH will be positive), while solidification is always exothermic (so ΔH will be negative).

The solid commonly used as an inactive electrode in electrochemical cells is Graphite. So option b is the correct answer.

Graphite is often chosen as an electrode material because it is chemically inert, highly conductive, and has a stable structure. This makes it suitable for various electrochemical applications without affecting the overall cell reactions.

An inactive electrode, also known as an inert electrode, is an electrode that does not participate in the chemical reaction occurring in the cell but serves as a conductor for the flow of electrons.

The graphite working electrode, which can be employed as an anode or a cathode in various electrochemical applications, is renowned for its chemical stability, superior electrical conductivity, and high melting point.

So the correct answer is option b. Graphite.

To know more about electrodes: https://brainly.com/question/25749323

#SPJ11

Answer:

$500

Explanation:

G00gle.

The rate at which atoms of radioactive sources, or radionuclides, disintegrate is measured in curies. A curie is a unit of measure for the amount of radioactive material present. It represents the amount of radioactive material in which 37 billion atoms disintegrate per second.

The disintegration of radionuclides produces ionizing radiation, which can be measured in rems or roentgens.

A rem is a unit of measurement for the amount of ionizing radiation absorbed by living tissue, while a roentgen is a unit of measurement for the amount of ionizing radiation in the air.
In summary, the rate at which atoms of radioactive sources disintegrate is measured in curies, while the amount of ionizing radiation produced by the disintegration can be measured in rems or roentgens. It is important to understand these units of measurement in order to properly monitor and regulate exposure to ionizing radiation, as it can have harmful effects on living organisms.

The rate at which atoms of radioactive sources (radionuclides) disintegrate is measured in curies (c).
To explain further, radioactive sources contain unstable atoms, called radionuclides. These radionuclides undergo disintegration or decay, during which they emit radiation. To quantify this process, we use various units.
Curies (Ci) is a unit of measurement specifically used to express the activity of a radioactive substance, or how quickly atoms in the radioactive source are disintegrating. One curie represents 37 billion disintegrations per second.

It's important to note the other units you mentioned:
- Rems (roentgen equivalent in man) is a unit used to measure the biological impact of ionizing radiation on human tissue.
- Roentgens (R) is a unit used to measure the exposure to ionizing radiation, specifically the amount of radiation that produces a certain amount of ionization in air.
- Rods is not a unit related to radioactivity, but might be confused with control rods, which are used in nuclear reactors to control the rate of nuclear reactions.

In summary, the appropriate unit for measuring the rate at which atoms of radioactive sources disintegrate is curies.

Learn more about radioactive at : brainly.com/question/1770619

#SPJ11

Change in temperature of the metal, ΔT₁ = 82.9°C

Change in temperature of water, ΔT₂ = 4.7°C

Temperature is a measure of the average kinetic energy of the molecules in a substance.

It is defined as the degree of hotness or coldness of a body.

Temperature changes occur when heat is added or removed from a substance.

To determine the temperature change in water and the meatal when the heated aluminum was placed in water, the following calculations are done:

Initial temperature of metal = 100°C

Initial temperature of water = 22.4°C

Final temperature of both = 27.1°C

Change in temperature of the metal, ΔT₁ = 100 - 27.1

ΔT₁ = 82.9°C

Change in temperature of water, ΔT₂ = 27.1 - 22.4°C

ΔT₂ = 4.7°C

In conclusion, the change in temperature is determined by finding the difference in the temperatures.

Learn more about temperature change at: https://brainly.com/question/24719561

#PSJ1

Answer:

100

22.4

27.1

4.7

72.9

Explanation:

It just is, trust me

A) CaCl2

Calcium chloride is an inorganic compound, a salt with the chemical formula CaCl2. It is a colorless crystalline solid at room temperature, highly soluble in water.

The energy is required to remove a proton from ¹⁵N₇ is

The reaction to remove the proton is given as follows :

¹⁵N₇  ---->   ¹⁴C₆  +  H

The mass of ¹⁵N₇   =  15.000109

the mass of ¹⁴C₆ = 14.003242

The mass of H = 1.007825

The energy requires to remove a proton is given as:

E = ( 14.003242 + 1.007825 - 15.000109) u

E = 0.010958 × 9312.5 MeV

E = 10.2046375 MeV

Thus, energy is required to remove a proton from ¹⁵N₇ with  the masses of the atoms ¹⁵N₇ , ¹⁴C₆ and H are 15.000109 u , 14.003242 u and 1.007825 u , respectively is 10.2046375 MeV.

To learn more about proton here

https://brainly.com/question/14162227

#SPJ4

Answer:

ooh sorry, but will this help you now:

Ocean dynamics define and describe the motion of water within the oceans. Ocean temperature and motion fields can be separated into three distinct layers: mixed (surface) layer, upper ocean (above the thermocline), and deep ocean. Ocean currents are measured in sverdrup (sv), where 1 sv is equivalent to a volume flow rate of 1,000,000 m (35,000,000 cu ft) per second.

Surface currents, which make up only 8% of all water in the ocean, are generally restricted to the upper 4…

Explanation:

Hope this helps :)

Answer:

It is the temperature at which water is frozen or is pure ice

"Absolutely zero" temperature is the coldest temperature possible. It's so cold that everything stops moving and has no energy left. Scientists use a special scale called Kelvin to measure temperature, and absolute zero is at 0 Kelvin or -273.15 degrees Celsius (-459.67 degrees Fahrenheit). We can't actually reach absolute zero in real life, but scientists have come very close in laboratories using special cooling methods.

4 is the highest energy level in arsenic as the 4s and 4p subshells are found in the fourth energy level. The 4s subshell has two electrons, while the 4p subshell has three. Arsenic thus has a valence electron count of 2 + 3 = 5.

A p-block element with an atomic number of 33 is arsenic.

Arsenic is a member of group 15.

Group 15's electronic configuration:

These elements' valence shell electrical configuration is ns2np3.

These elements' electronic arrangement is exceptionally stable due to their fully filled s orbitals and partially filled p orbitals.

Arsenic's electronic configuration:

3s2 3p6 4s2 3d10 4p3 s2 2s2 2p6

In the above electron configuration, the highest energy level (4).

to know more about electronic configuration visit

https://brainly.com/question/29157546

#SPJ4

Answer:

I answered this in your recent post of this question.

Explanation:

Hope that this helps you out! :)          

If you have any questions please put them in the comment section below this answer.          

Have a great rest of your day/night!          

Please thank me on my profile if this answer has helped you.

The reaction between pottasium metal and chlorine gas is an example of combination reaction and the balanced equation is as follows: 2K + Cl₂ → 2KCl

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.

According to this question, potassium metal reacts with chlorine gas to form solid potassium chloride. The balanced equation is as follows:

2K + Cl₂ → 2KCl

Based on the above equation, pottasium combines with chlorine chemically to form pottasium chloride compound, hence, it is an example of combination reaction.

Learn more about combination reaction at: https://brainly.com/question/32027270

#SPJ1

The Lewis structure of the element have been shown in the image attached.

The valence electrons of an atom or molecule are depicted in a simplified manner by the Lewis structure, commonly referred to as the Lewis dot structure or electron dot structure. Gilbert N. Lewis, an American scientist, created it.

The valence electrons of an atom are shown in a Lewis structure as dots surrounding the element's symbol. These dots' placement reveals details about the connectivity and atom-atom bonding in a molecule.

Learn more about Lewis structure:https://brainly.com/question/29756546

#SPJ1

Explanation:

Plastic takes time to degrade which means it has great longevity. Plastic does not break as easily as glass or other materials. It lasts long and offers great service. Plastic storage containers offer greater flexibility than any other packaging materials.

In a simple distillation setup, the sequence of equipment from the bench top to the round bottom flask is:

This is the process in which a mixture is separated through selective boiling and condensation.

The distillation flask and liebig condenser are usually located above the round bottom flask in the set up.

Read more about Distillation here https://brainly.com/question/24553469

#SPJ4

The given statement "The point at which indicator undergoes color change is called end point titration. " is True.

The endpoint of a titration is the point at which the indicator being used undergoes a color change, indicating that the reaction between the analyte and the titrant is complete. The choice of indicator depends on the nature of the reaction being studied and the pH range in which the reaction occurs. The indicator is selected such that its color changes at the pH at which the reaction is complete. For example, phenolphthalein is commonly used as an indicator in acid-base titrations because it changes from colorless to pink in the presence of a base, indicating the endpoint of the titration.

To know more about phenolphthalein, here

brainly.com/question/14804470

#SPJ4

, the molar concentration of the solution is 2.202 M. molar concentration of a solution that contains 45.0 g of nacl dissolved in 350.0 ml of water

To calculate the molar concentration of a solution, we need to first determine the number of moles of the solute present in the solution, and then divide that by the volume of the solution in liters.

The molar mass of NaCl is 58.44 g/mol. Therefore, the number of moles of NaCl in 45.0 g can be calculated as:

mole= mass / molar mass = 45.0 g / 58.44 g/mol = 0.7709 mol

Next, we need to convert the volume of the solution from milliliters to liters:

volume = 350.0 ml = 0.3500

Finally, we can calculate the molar concentration (M) of the solution as:

M = moles / volume = 0.7709 mol / 0.3500 L = 2.202 M

Learn more about concentration  here:

https://brainly.com/question/30665317

#SPJ11

Answer: A

Explanation:

i just took the quiz and it was right!

the answer should be

Zn+CuSO4→ZnSO4+Cu.

I hope this is right!

Answer:

72.71 %

Explanation:

For oxygen: mass % O = (mass of 1 mol of oxygen/mass of 1 mol of CO2) x 100. mass % O = (32.00 g / 44.01 g) x 100. mass % O = 72.71 %

HOPED THIS HELPED YOU OUT

A brainliest is always appreciated.

Answer:

A There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products.

Explanation:

Matter is conserved in a chemical equation if there are no loss of atoms. That means, total number of atoms of elements must be the same as the total number of element on the product side. The correct option is;

A. There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products.

Answer:

its A. i just did dat

In order for CO2 to behave more like an ideal gas, a change in temperature and pressure needs to be suggested. If the pressure of the CO2 sample is reduced and the temperature is increased, then the behavior of the gas will be more like an ideal gas.

A sample of CO2 is placed in a sealed rigid cylinder with a movable piston at 81°C and 101 kPa. What is the change in temperature and pressure of the CO2 that would cause it to behave more like an ideal gas An ideal gas follows the laws of Boyle and Charles, where the pressure, volume, and temperature are related by the equation PV=nRT. The ideal gas law assumes that the gas molecules have no volume and do not interact with each other. In reality, no gas behaves exactly like an ideal gas. However, if the pressure is reduced and the temperature is increased, the behavior of the gas will be more like an ideal gas. At a constant volume, the pressure and temperature of a gas are directly proportional.

Therefore, if the pressure is reduced, the temperature must be increased to keep the behavior of the gas constant. The amount of gas in the cylinder is constant, so n does not change. Therefore, the change in pressure and temperature is proportional to the change in volume. The ideal gas law is a fundamental equation that relates the pressure, volume, and temperature of an ideal gas. The law is expressed as PV=nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature. The ideal gas law assumes that the gas molecules have no volume and do not interact with each other.

To know more about gas Visit;

https://brainly.com/question/13123721

#SPJ11

Explanation:

Sand is a common material found on beaches, deserts, stream banks, and other landscapes worldwide. In the mind of most people, sand is a white or tan, fine-grained, granular material. However, sand is much more diverse - even beyond the pink sand beaches of Bermuda or the black sand beaches of Hawaii.

Answer:

Debido al descubrimiento de protones, neutrones y electrones.

Explicación:

La teoría de Demócrito fue reemplazada por la teoría de Dalton y luego la teoría de Dalton fue reemplazada por la de Rutherford debido al descubrimiento de protones, neutrones y electrones que están presentes dentro del átomo. Demócrito afirma que el átomo es una partícula indivisible de materia, pero el descubrimiento del protón, el neutrón y el electrón cambió este concepto de átomo, por lo que debido al mayor descubrimiento y estudio del átomo y sus partículas subatómicas, las teorías cambiaron con el paso del tiempo.

Answer:

D) Cool air is warming quickly.

Explanation:

d is the answer.

The arrows at point 3 indicates that Warm air is cooling quickly and the correct option is option C.

Sea breeze is a  blowing breeze from sea towards land during the day is called sea breeze.

During the day, the land surface heats up faster than the water surface.

Therefore, the air above the land is warmer than the air above the ocean.

As a result, warm air rises. Therefore, the warmer air over the land surface is rising.

As the warm air over the land is rising, the cooler air over the ocean is flowing over the land surface to replace the rising warm air

Therefore, The arrows at point 3 indicates that Warm air is cooling quickly and the correct option is option C.

Learn more about Sea Breeze, here:

https://brainly.com/question/13015619

#SPJ7

Answer:

KEY TAKEAWAYS

Key Points

The difference in electronegativities between oxygen and hydrogen atoms creates partial negative and positive charges, respectively, on the atoms.

Water molecules attract or are attracted to other polar molecules.

Molecules that do not dissolve in water are known as hydrophobic (water fearing) molecules.

Key Terms

hydrophilic: having an affinity for water; able to absorb, or be wetted by water

hydrophobic: lacking an affinity for water; unable to absorb, or be wetted by water

polarity: The intermolecular forces between the slightly positively-charged end of one molecule to the negative end of another or the same molecule.

Explanation:

maybe this will help :)

Answer:

gonna check them rn :) youre not d u mb dont worry (:

Answer: The molar mass of \(BF_3\) is 67.81 g/mol

Explanation:

Molar mass is defined as the mass in grams of 1 mole of a substance.

S.I Unit of Molar mass is gram per mole and it is represented as g/mol.

Atomic Mass of Boron (B) = 10.81 g

Atomic Mass of Flourine (F) = 18.99  g

Molecular mass of  \(BF_3\) = 1 (10.81)+3(18.99) g = 67.81 g

Thus molar mass of \(BF_3\) is 67.81 g/mol