How many moles of kbr will be produced from 7 moles of babr2.

Answer:

2Li(OH)-->Li2O+H20

Explanation:

There are 2Li, 2H and 2O on each side

The entropy  is -3.65 and -0.049 J per kelvin per mole respectively are the entropy of an insulated tank.

Entropy is a measure of randomness in a system. It is a state function. It can be denoted by heat supplied for a reversible system per temperature.

The final pressure will be the partial pressure of each gas in the mixture.

a) Partial pressure of nitrogen = mole fraction of nitrogen x total pressure = (0.79 mol) × (1 + 1 bar)/(0.79 + 0.29 mol) = 1.46 bar

Partial pressure of oxygen = mole fraction of oxygen x total pressure = (0.29 mol) ×(1 + 1 bar)/(0.79 + 0.29 mol) = 0.54 bar

Therefore,

ΔS of nitrogen= -R ln1.46 = -0. 38R

∆S of oxygen= -R ln 0.54= -0. 61R

ΔSuniv=−(0.79mol/0.79+0.29mol)×0.38 R−(0.29mol/0.79+0.29mol)×0.61

R=−0.27 R−0.16

R=−0.44

R=−3.65JK−1mol−1

(b) Partial pressure of nitrogen = mole fraction of nitrogen x total pressure = (0.79 mol) × (2 + 1 bar)/(0.79 + 0.29 mol) = 2.19 bar

Partial pressure of oxygen = mole fraction of oxygen x total pressure = (0.29 mol) × (2 + 1 bar)/(0.79 + 0.29 mol) = 0.80 bar

ΔS of nitrogen gas=−Rln1.46=−0.09R

ΔSof sulphur oxide =−Rln0.54=0.22R

ΔSuniv=−(0.79mol/0.79+0.29mol)×0.09R+(0.29mol/0.79+0.29mol)×0.22

R=−0.066 R+0.060

R=−0.049JK−1mol−1

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Answer:

Zinc oxide is  used in the manufacture of  many products such as paints, rubber, cosmetics, pharmaceuticals, plastics, inks, soaps, batteries, textiles and electrical equipment.

Explanation:

To find the molarity of the solution, you'll need to first determine the moles of iron(II) nitrate and then divide that by the volume of the solution in liters. Next, you'll determine the concentration of iron(II) cation and nitrate anion using the mole ratio from the chemical formula of iron(II) nitrate.

1. Calculate the moles of iron(II) nitrate \((Fe(NO_{3} )_{2} )\):
- Molar mass of  \((Fe(NO_{3} )_{2} )\) = (55.8 g/mol for Fe) + (2 × (14.0 g/mol for N + 3 × 16.0 g/mol for O))
- Molar mass of  \((Fe(NO_{3} )_{2} )\)= 179.8 g/mol
- Moles of  \((Fe(NO_{3} )_{2} )\)= 17.2 g / 179.8 g/mol = 0.0957 mol
2. Convert volume to liters:
- 250 mL = 0.250 L
3. Calculate the molarity of the solution:
- Molarity = moles of solute / volume of solution in liters
- Molarity = 0.0957 mol / 0.250 L = 0.3828 M
4. Determine the concentration of iron(II) cation (\(Fe^{2+}\)):
- There is 1 \(Fe^{2+}\) ion per  \((Fe(NO_{3} )_{2} )\) molecule, so the concentration of \(Fe^{2+}\) is the same as the molarity of the solution.
- Concentration of \(Fe^{2+}\) = 0.3828 M
5. Determine the concentration of nitrate anion (NO₃⁻):
- There are \(2 NO^{-} _{3}\) ions per \((Fe(NO_{3} )_{2} )\) molecule, so the concentration of NO₃⁻ is twice the molarity of the solution.
- Concentration of  \(2 NO^{-} _{3}\) = 2 × 0.3828 M = 0.7656 M
The molarity of the iron(II) nitrate solution is 0.3828 M. The concentration of the iron(II) cation (\(Fe^{2+}\)) is 0.3828 M, and the concentration of the nitrate anion  \(2 NO^{-} _{3}\) is 0.7656 M.

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Answer:

D.Cooking an egg

Explanation:

This is because when cooked, the heat denatures the proteins which changes their properties and composition. The most clear ways this happens with eggs are when they're fried for something like egg fried rice.

Sterilization can be achieved using various methods, including steam and pressure, dry heat, dry gas, or radiation. It is a crucial process used to eliminate all forms of microbial life from objects or surfaces.

Sterilization is a crucial process used to eliminate all forms of microbial life from objects or surfaces. One method of sterilization involves using steam and pressure. This technique, known as autoclaving, utilizes high-pressure steam to kill microorganisms effectively. Autoclaves are widely used in medical facilities, laboratories, and other industries where sterile conditions are necessary.

Another method of sterilization is through the use of dry heat. This process involves subjecting the objects to high temperatures for a specified duration to destroy microorganisms. Dry heat sterilization is commonly used for heat-resistant equipment, such as glassware and metal instruments.

Dry gas sterilization is another technique used to achieve sterility. It involves using sterilizing gases like ethylene oxide or hydrogen peroxide vapor to eliminate microorganisms. This method is often employed for sensitive materials or equipment that cannot withstand high temperatures or moisture.

Lastly, radiation sterilization utilizes ionizing radiation, such as gamma rays or electron beams, to kill microorganisms. This technique is commonly used for disposable medical supplies, pharmaceutical products, and certain types of food.

In conclusion, sterilization can be achieved using various methods, including steam and pressure (autoclaving), dry heat, dry gas, or radiation. Each method has its advantages and is chosen based on the nature of the materials being sterilized and the desired level of sterility.

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a) The explosiveness of hydrogen gas is a chemical property.

b) The bronze color of copper is a physical property.

c) The shiny appearance of silver is a physical property.

d) The ability of dry ice to sublime (change from solid directly to vapor) is a physical property.

Chemical properties are properties that describe the behavior of a substance during a chemical reaction or a chemical change. Explosiveness of hydrogen gas is an example of a chemical property because it describes how hydrogen gas reacts with oxygen to form water and how the reaction releases a large amount of energy in the form of an explosion.

Physical properties, on the other hand, are properties that describe the characteristics of a substance that can be observed or measured without changing the composition of the substance. Examples of physical properties include the color, texture, and melting point of a substance. The bronze color of copper and the shiny appearance of silver are both examples of physical properties.

The ability of dry ice to sublime (change from solid directly to vapor) is also a physical property because it describes a physical change that occurs when dry ice is heated or exposed to high pressure.

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Ethyl alcohol is not a chemical mutagen.

Chemical mutagens are common methods for mutagenesis in a number of organisms, and in most genetic systems, they are the main way to introduce mutations into phenotype-based screens. Alkylating chemicals that cause point mutations in DNA, such as ethyl-methane sulfonate and N-methyl-N-nitrosourea, are the most often utilized chemical mutagens. Only option C is a physical mutagen while others are chemical mutagens provided in the question.

Alcohol causes cancer, birth defects, and mutations in humans. The first metabolite of ethanol, acetaldehyde, is mutagenic. The discovery that acetaldehyde causes sister-chromatid exchanges, chromosomal aberrations, and cross-links between DNA strands supports this.

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Complete question is:

Which is not a chemical mutagen?.

a. Nitrous acid

b. Magnus salt

c. Ethyl alcohol

d. Eosin

Answer:

Because it is a strong acid

Explanation:

All strong acids are consideredpositive

To determine the ratio of ratios for the two compounds, we need to compare the percentages of sulfur and oxygen in each compound. The ratio of ratios for the two compounds is 1.25/8.93.

Compound 1:

Sulfur (S) = 50.0%

Oxygen (O) = 50.0%

Compound 2:

Sulfur (S) = 40.0%

Oxygen (O) = 5.600% Now, let's calculate the ratio of ratios: Ratio of sulfur (S): Compound 1: Compound 2 = 50.0% / 40.0% = 1.25

Ratio of oxygen (O): Compound 1: Compound 2 = 50.0% / 5.600% = 8.93. Therefore, the ratio of ratios for the two compounds is 1.25/8.93. Compounds are substances composed of two or more elements chemically bonded together. In a compound, the constituent elements are present in fixed proportions and are held together by chemical bonds.

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Answer:

56.94759 grams of NO2

Explanation:

Stoichiometric Equation:

1 S + 6 HNO3 → 1 H2SO4 + 6 NO2 + 2 H2O.

This is so you can create ratios between each compound in the reaction, and identify the limiting and excess reactants to determine exactly how much can be produced?

The coefficients or molecular quantity of each compound in the balanced equation represents the amount of moles.

To figure out how much can be produced, you have to convert 59.54 g of S into moles of S and 78 g of HNO3 into moles of HNO3.

A reference such as a periodic table can be very helpful as it has the atomic mass of each element which is the mass with respect to 1 mol of that element.

Answer:

in first picture pressure is low and in second picture the pressure is high

2ans in first picture air is

less amount

in second picture air is high amount

Answer:

protons in the nucleus

The number of atoms on both the reactant and product side is equal, the products must contain 4 copper atoms, 5 oxygen atoms, and 10 hydrogen atoms.

A reactant refers to any substance that takes part in a chemical reaction. Chemical reactions involve the breaking and forming of chemical bonds between atoms, molecules, or ions to form new substances. Reactants are the starting materials that undergo a change during a chemical reaction to produce one or more new substances, called products.

Reactants can be solids, liquids, or gases, and they can be pure substances or mixtures. They may be organic or inorganic compounds, acids, bases, salts, or other types of chemicals. Reactants participate in chemical reactions according to their properties and reactivity. The reactivity of a reactant is influenced by its electronic structure, molecular shape, polarity, and other factors.

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False. A prochiral center does not describe an sp_3 hybridized atom that can become a chirality center by changing one of its attached groups.

A prochiral center is an atom that possesses chirality, meaning it can become a chirality center by changing its stereochemistry. However, the statement in question is incorrect because a prochiral center does not require changing one of its attached groups to become a chirality center.

In contrast, a prochiral center is a type of stereocenter that exhibits chirality due to the presence of two different groups attached to it. It becomes a chirality center when one of the groups is replaced by another group, resulting in the formation of two distinct stereoisomers.

An example of a prochiral center is a carbon atom with three different groups attached to it. Upon substitution of one of the groups, the prochiral center becomes a chirality center, giving rise to enantiomers.

Therefore, the statement that a prochiral center can become a chirality center by changing one of its attached groups is false.

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Answer:

A. electrons must be parts of the atoms of all elements

The scientists are most likely studying precipitation (Option D).

In meteorology, precipitation is any result of atmospheric water vapor condensation that falls under the gravitational attraction of clouds. Drizzle, rain, sleet, snow, ice pellets, graupel, and hail are the most common types of precipitation.

Rain gauges and snow gauges are two forms of precipitation measuring instruments, and several versions are created depending on the use. This chapter discusses rain gauges. Rain gauges are divided into two types: recording and non-recording.

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Answer:

The velocity of the bb when it reaches a height of 203 m can be determined using the laws of projectile motion. Since the bb is moving vertically upwards, its velocity at that height will be zero.

brainlest?

Answer: v = 83.96 m/s

Assuming the acceleration due to gravity is approximately 9.8 m/s^2, we can use the principles of projectile motion and energy conservation.

Using the equation for the vertical displacement of an object in free fall:

Δy = (v₀² - v²) / (2g)

Δy = vertical displacement (203m)

v₀ = initial velocity (105 m/s)

v = final velocity (not known yet)

g = accerlation due to gravity (9.8 m/s^2)

Lets rearrange the equation to solve for the final velocity:

v = v = √(v₀² - 2gΔy)

Substituting the given values:

v = √(105² - 2 * 9.8 * 203)

v ≈ √(11025 - 3979.6)

v ≈ √(7054.4)

v ≈ 83.96 m/s

Therefore, when the BB pellet is at the height of 203m, its velocity will be approximately 83.96 m/s.

The height of a ramp does not directly determine the strength of the frictional force between a book and an object.

The strength of the frictional force between a book and an object is not directly influenced by the height of a ramp. The nature of the surfaces in contact, the force forcing the surfaces together (normal force), and the coefficient of friction are some of the variables that affect the frictional force between two surfaces.

The coefficient of friction between the book and the object plays a major role in determining the strength of the frictional force.

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Answer:

Methane is made up discrete molecules hence it adopts a simple molecular structure with weak vanderwaals forces of attraction while Silicon dioxide adopts a giant covalent structure with strong silicon to oxygen bonds.

Hence Silicon dioxide has a high melting point than methane.

Answer:

D: Na

Explanation:

Hope this helps!

Have a nice day!!

:D

A temperature regime that experiences consistent high temperatures with little seasonality is the equatorial.

These systems have a significant impact on how soils are used and managed, especially when choosing plants that are adapted to the environment. There are 10 different soil temperature regimes: cryic, frigid, hyperthermic, isofrigid, isohyperthermic, isomesic, isothermic, mesic, pergelic, and thermic.

Mesic. At a depth of 50 cm from the soil surface or at a dense, lithic, or paralytic contact, whichever is shallower, the difference between the mean summer and mean winter soil temperatures is greater than 6° C and the mean annual soil temperature is 8° C or higher but lower than 15° C.

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The correct expression for the percentage yield of calcium oxide is approximately 4808%.

To find the theoretical yield, we need to calculate the stoichiometric ratio between calcium carbonate (CaCO3) and calcium oxide (CaO). The balanced equation for the reaction is:

CaCO3 → CaO + CO2

From the equation, we can see that one mole of calcium carbonate produces one mole of calcium oxide. We can calculate the molar mass of calcium carbonate and calcium oxide to convert the given masses into moles:

Molar mass of CaCO3 = 40.08 g/mol (calcium) + 12.01 g/mol (carbon) + (3 x 16.00 g/mol) (oxygen) = 100.09 g/mol

Molar mass of CaO = 40.08 g/mol (calcium) + 16.00 g/mol (oxygen) = 56.08 g/mol

Using the molar masses, we can convert the given masses into moles:

Moles of CaCO3 = 5.00 g / 100.09 g/mol = 0.04998 mol

Moles of CaO = 2.40 g / 56.08 g/mol = 0.04281 mol

The theoretical yield of calcium oxide is 0.04998 mol, as determined by the stoichiometry of the balanced equation.

Now, we can calculate the percentage yield using the formula:

Percentage yield = (actual yield / theoretical yield) x 100%

Percentage yield = (2.40 g / 0.04998 mol) x 100% ≈ 4808%

Therefore, the correct expression for the percentage yield of calcium oxide is approximately 4808%. However, it's important to note that a percentage yield above 100% suggests a possible error in the experimental procedure or measurements.

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All three substances (sodium chloride, glucose, and albumin) can generate osmotic pressure.

Osmotic pressure is the pressure that arises from the difference in concentration of solutes between two solutions separated by a semi-permeable membrane. The semi-permeable membrane allows small solvent molecules, such as water, to pass through it but not larger solute molecules.

Sodium chloride, glucose, and albumin can all generate osmotic pressure because they are all solutes that are not able to pass through the semi-permeable membrane. As a result, a higher concentration of these substances on one side of the membrane compared to the other creates an imbalance in the concentration of solvent and solute, leading to the movement of solvent from the side with lower concentration to the side with higher concentration. This movement generates pressure, which is known as osmotic pressure.

In summary, the generation of osmotic pressure depends on the presence of solutes that are not able to pass through the semi-permeable membrane, and all three substances (sodium chloride, glucose, and albumin) fit this criteria.

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The cube root of a number is the reverse of the cube of a number and it can be found by prime factorization method. The cube root of 8000 is 20.

Prime Factorization is the finding which prime numbers multiply together to make the original number. A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number.

Prime factorization of 8000 is 2 × 2 × 2 × 2 × 2 × 2 × 5 × 5 × 5

Simplifying the above expression: \(2^{6}\) * \(5^{3}\)

Simplifying further: \(20^{3}\)

Therefore, the cube root of 8000 by prime factorization is (2 × 2 × 2 × 2 × 2 × 2 × 5 × 5 × 5)1/3 = 20.

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The amount of heat that  is required to melt 22g piece of ice at -8 degrees to water at 14 degrees is 1,011.56 Joules.

Required amount of heat will be calculated by using the below equation as:

Q = mcΔT, where

m = mass = 22g

c = specific heat of ice = 2.09 J/g. degree C

ΔT = change in temperature = 14 - (-8) = 22 degree C

On putting all values, we get

Q = (22)(2.09)(22) = 1,011.56 J

Hence required amount of heat is 1,011.56 J.

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In each pair, the solution that contains the weaker conjugate acid is more basic. Without any calculations, we can determine which solution is more basic by identifying the stronger conjugate acid in each pair.

In Part A, KClO is a stronger acid than NaF, so the solution in (b) is more basic in Part B, NaBrO is a stronger acid than NaBr, so the solution in (b) is more basic in Part C, HNO2 is a weaker acid than KOH, so the solution in (b) is more basic in Part D, NH4Cl is a weaker acid than HCN, so the solution in (a) is more basic.

It is important to note that while we did not perform any calculations, this method only works for comparing solutions with the same concentration. If the concentrations were different, we would need to perform calculations to determine which solution is more basic. A

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Bonds formed when two atoms or compounds respectively donate and receive electrons are named iconic bonds and readily dissociate in water.

Electrostatic attraction between ions with opposing charges in a chemical molecule creates an ionic bond, also known as an electrovalent bond. When the valence (outermost) electrons of one atom are permanently transferred to another atom, a bond of this kind is created. If an atom receives electrons, it becomes a negatively charged ion (cation), but if it loses them, it becomes a positively charged ion (cation) (anion).

Ionic or electrovalent compounds are produced via ionic bonding, and the compounds generated between nonmetals and alkali and alkaline-earth metals serve as the best examples of this type of compound. The electrostatic forces of attraction between opposite charges and repulsion between similar charges orient the ions in these types of ionic crystalline solids so that every positive ion is surrounded by negative ions.

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Explanation:

Hi,

The number of protons is equal to the atomic number. The number of electrons in a neutral atom is equal to the number of protons. So, in this case, you have 72 protons and 72 electrons.

I hope this helps :)

If an element has the atomic number 72, then the number of protons is also equal to 72. As it is clearly mentioned in the question that it is a neutral atom, which means the number of protons is equal to the number of electrons which is also 72.

An atomic number may be defined as the number of a chemical element in the modern periodic table through which the elements are systematically arranged in order of increasing the number of protons in the nucleus.

According to the context of this question, the atomic number of every element is always equal to the number of protons it has. While in a neutral atom, the number of electrons is equal to the number of protons. For calculating the number of neutrons, you have to subtract the atomic number from the atomic mass.

Therefore, there are 72 protons of an element whose atomic number is 72. The number of electrons is also 72.

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