Calculate the Zn conc. of Zn/Zn++ // Cl/Cl- 0.1M Emf=2.21v
answers:
a)0.1M
b)0.2M
c)0.05M
d)0.15M


Thanks!​

At T = 40°C and p = 170 KPa, the kinematic viscosity of air is approximately 1.61 x 10⁻⁵ m²/s, and the kinematic viscosity of water is approximately 6.59 x 10⁻⁷ m²/s.

To find the kinematic viscosities of air and water at the given temperature and pressure, we can use the formula:

Kinematic Viscosity (ν) = Dynamic Viscosity (μ) / Density (ρ)

Given values:

Dynamic viscosity of air (μ) = 1.91 x 10⁻⁵ Ns/m²

Dynamic viscosity of water (μ) = 6.53 x 10⁻⁴ Ns/m²

Density of water (ρ) = 992 kg/m³

Step 1: Convert the given pressure from kilopascals (KPa) to pascals (Pa).

Pressure (p) = 170 KPa = 170,000 Pa

Step 2: Use the ideal gas law to find the density of air at the given temperature and pressure.

The ideal gas law equation is: p = ρ * R * T

\(R_{air\) is the specific gas constant for air, which is approximately 287 J/(kg·K).

Rearranging the equation to solve for density:

ρ = p / (\(R_{air\)* T)

Step 3: Substitute the values into the equation to calculate the density of air.

ρ = 170,000 Pa / (287 J/(kg·K) * 313.15 K)

         ≈ 1.188 kg/m³

Step 4: Calculate the kinematic viscosity of air.

\(v_{air\) = μ / ρ

     = (1.91 x 10⁻⁵  Ns/m²) / 1.188 kg/m³

     ≈ 1.61 x 10⁻⁵ m²/s

Step 5: Calculate the kinematic viscosity of water.

\(v_{water\) = μ / ρ

        = (6.53 x 10⁻⁴ Ns/m²) / 992 kg/m₃

        ≈ 6.59 x 10⁻⁷m²/s

Therefore, at T = 40°C and p = 170 KPa, the kinematic viscosity of air is approximately 1.61 x 10⁻⁵ m²/s, and the kinematic viscosity of water is approximately 6.59 x 10⁻⁷ m²/s.

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Answer:

There are 0.301 moles of N2 gas in 6.75 liters of N2 gas.

Explanation:

Given,

Volume of N2 gas = 6.75 L

We know,

At STP,

Number of moles = \(\frac{Volume}{22.4 L}\)   [Here 22.4 liter is the molar volume of any gas at STP]

                              = \(\frac{6.75L}{22.4L}\)

                              = \(0.301\)

∴There are 0.301 moles of N2 gas in 6.75 liters of N2 gas.

The molar mass of the gas, given that 3.25 g of the gas occupied 2.56 L is 30.66g/mol

To obtain the molar mass of the gas, we shall first obtain the number of mole of the gas. This can be obtained as follow:

PV = nRT

0.95 × 2.56 = n × 0.0821 × 280

Divide both sides by (0.0821 × 280)

n = (0.95 × 2.56) / (0.0821 × 280)

n = 0.106 mole

Haven obtain the mole of the gas, we shall determine the molar mass of the gas as follow:

Molar mass = mass / mole

Molar mass of gas = 3.25 / 0.106

Molar mass of gas = 30.66g/mol

Thus, the molar mass of the gas is 30.66g/mol

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Answer:

Two ions that produced similar colors in the flame test were Ca+2 and Sr+2. 3.

Explanation:

The colors are produced when an electron jumps to a higher level and then jump back down.

Ba2+ and Cu2+ and Sr2+ and Li+ were the pair with the similar color. Sr and Li displayed red colors, while Ba and Cu had mild greenish yellowish hues.

Why do some ions in the flame test generate colors that are similar?

The precise sizes of the potential energy jumps differ from metal to metal. As a result, the flame color of each metal will differ due to its unique spectral line pattern. The movement of the electrons in the metal ions contained in the compounds results in the hues of the flame.

The energy released by each electron when it returns to its initial condition determines the hue of the light that is produced.

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Kilocalorie is a unit of measuring the amount of energy of a reaction, but this is not the only unit, we can also have Joules as a unit, and the conversion is:

1 Kcal = 4184 Joules

Therefore if we have 3.25 Kcal, we will have:

3.25 * 4184 = 13600 Joules of energy, therefore letter D

Answer:

it is less dense than oxygen gas.

Explanation:

Hydrogen is the simplest chemical element that exists. The symbol for the chemical element Hydrogen is "H" and it is a colourless, tasteless, odorless, and highly flammable gas.

Hydrogen is a chemical element found in group (1) of the periodic table and as such it has one (1) electrons in its outermost shell. Therefore, Hydrogen has an atomic number of one (1) and a single valence electrons because it has only one proton and one electron in its nucleus.

In Chemistry, the properties of a chemical element that can be observed and measured without changing its chemical nature is known as a physical property. It includes density, color, freezing point, opacity, smell, melting point, viscosity, etc.

Hence, the statement which describes a physical property of hydrogen is that it is less dense (density) than oxygen gas.

Answer:

See explanation

Explanation:

A pure liquid has a sharp boiling point. Now we know that the boiling point of water is 100°C.

If Laura begins to heat each liquid with a thermometer inserted into each liquid, the liquid that boils at exactly 100°C is pure water while the rest are solutions.

Answer:

B) The Metal A ion is reduced and Metal B is oxidized.

Explanation:

When we think of electroplating, we often think of a set up in which there is a nonsponteanous reaction driven by the presence of a cell.

However, in displacement plating, a cell is not involved. Metals are chosen based on their respective position in the electrochemical series.

For instance, silver can be coated on copper by immersing the copper rod into a silver ion solution. The copper rod becomes oxidized. The silver ions accept electrons and become deposited on the copper rod.

Answer:

Option B

Transfers energy to the water

Explanation:

Warm air transfers energy to the water when it flows over cold currents. This means that the warm air loses heat energy to the cold currents thus, raising its temperature.

Whenever there is a temperature difference between two bodies in contact with each other, the Fouriers law explains that there is always a transfer of heat from the hotter body to the colder body until they become the same temperature.

Thus, following this, heat will flow from the warm air to the cold currents.

Answer:

The solution is made by adding 4.38 g NaCl to a 250-mL volumetric flask. About 100 mL of water are added and when all the NaCl dissolves water is added up ...

Answer:

3.07122*10^24 particles

Explanation:

To convert moles to particles, remember that a mole of something is defined as 6.022*10^23 atoms of that thing.

5.1 mol * 6.022x10^23/1 mol = 3.07122*10^24 particles

Answer:

Final pressure is 0.956 atm

Explanation:

Based on Boyle's law, "The volume of an ideal gas is inversely proportional to the pressure when temperature is constant". The equation is:

P₁V₁ = P₂V₂

Where 1 represents initial state and 2 final state of the gas.

If a gas has 239L and 2.00 atm as initial state. If the final volume is 500L:

239Lₓ2.00atm =  P₂500L

239Lₓ2.00atm / 500L =  P₂

0.956atm =  P₂

Answer:

Physical and chemical properties of evidence can pinpoint the cause of unalive, or can identify the unaliver!

Explanation:

Three different molecular movements, including translational, rotational, and vibrational motions, are feasible for unrestrained gas molecules.

Unrestrained gas molecules have three separate types of motion: vibration, rotation, and translation. Translation describes a full molecule travelling linearly in space. A molecule in rotational motion revolves around the core of its mass. Vibrational motion is created by the atoms' internal oscillations within the molecule.

According to the principles of thermodynamics and statistical mechanics, these three motions work together to form the overall behaviour and properties of gas molecules, such as temperature, pressure, and heat capacity.

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Answer:

Services raise the pH in the hair to a alkaline state in order to soften and swell the hair shaft. Disulfide, hydrogen, salt. Side bonds are responsible for the strength and elasticity of the hair. Altering these is what make wet setting, thermal styling, permanent waving, curl reforming, and relaxing possible

A pH of 7 is neutral, a pH below 7 is acidic, and pH above 7 is alkaline. ... Chemical Texturizers raise the pH of the hair to an alkaline state in order to soften and swell the hair shaft. This action lifts the cuticle layer, and allows the solution to reach the cortex layer where restructuring takes place.

Explanation:

the oxygen atom

Explanation:

Water is a molecular compound consisting of polar molecules that have a bent shape. The oxygen atom acquires a partial negative charge while the hydrogen atom acquires a partial positive charge.

Answer:

Carbon

Explanation:

oxygen is more electronegative than carbon, the electrons will spend more time around the oxygen atom giving it a partially negative charge while the carbon will become partially positive. Some atoms retain lone (unbonded) pairs of electrons when they are part of a covalent complex.

Answer:

false it is a chemical change

The Lewis structure for the sulfate polyatomic ion (SO4)2- is:

      O
      ||
-O - S - O-
      ||
      O

     O    
      ||    
O = S - O-
      ||      
    -O  

There are a total of 6 equivalent resonance structures that can be drawn for the sulfate ion. These structures differ only in the placement of the double bonds between sulfur and oxygen atoms. One structure has two double bonds between sulfur and oxygen atoms, while the other has one double bond and one single bond between sulfur and oxygen atoms.

The Lewis structure for the sulfate polyatomic ion (SO₄²⁻) consists of a central sulfur atom surrounded by four oxygen atoms, with each oxygen atom forming a double bond with the sulfur atom.

There are a total of 32 valence electrons in this structure. Due to the nature of the double bonds and the overall charge, there are 6 equivalent resonance structures that can be drawn for the sulfate ion. This resonance stabilization contributes to the stability of the ion.

Sulfur has 6 valence electrons, and each oxygen has 6 valence electrons, giving a total of 32 valence electrons for the sulfate ion (6 from sulfur + 4 x 6 from oxygen). To complete the Lewis structure, we add formal charges to each atom to make sure the overall charge of the ion is -2. The sulfur atom has a formal charge of 0, while each oxygen atom has a formal charge of -1.

These structures have the same overall charge and the same number of valence electrons, but the distribution of electrons is different.

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The Lewis structure for the sulfate polyatomic ion can be drawn by following a few steps. There are equivalent resonance structures that can be drawn for the ion.

The Lewis structure for the sulfate polyatomic ion (SO42-) can be drawn by following these steps:

There are equivalent resonance structures that can be drawn for the sulfate polyatomic ion because the double bond can be moved around among the oxygen atoms while maintaining the same overall structure.

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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Chiral carbon refers to compounds with at least one carbon atom connected to four different groups, whereas Achiral carbon refers to molecules without a carbon atom bonded to four separate groups.

Chiral carbon centres are tetrahedrally positioned carbon atoms that have four distinct substituents bonded to them. The terms "stereogenic carbons" and "asymmetrical carbon atoms" are also used to describe chiral carbon atoms.

An achiral molecule lacks "handedness" and can be superimposed on its mirror copy (think of a baseball bat, which can be used with either hand)

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Answer:

1. [H⁺] = 1.58×10¯¹⁰ mol/L

2. pH = 9.8

3. pOH = 4.2

Explanation:

We'll begin by calculating the pOH of the solution. This can be obtained as follow:

Concentration of Hydroxide ion [OH¯] = 5.8×10¯⁵ mol/L

pOH =?

pOH = –Log [OH¯]

pOH = –Log 5.8×10¯⁵

pOH = 4.2

Next, we shall determine the pH of the solution. This can be obtained as follow:

pOH = 4.2

pH =?

pH + pOH = 14

pH + 4.2 = 14

Collect like terms

pH = 14 – 4.2

pH = 9.8

Finally, we shall determine the concentration of Hydrogen ion [H⁺] in the solution. This can be obtained as follow:

pH = 9.8

Concentration of Hydrogen ion [H⁺] =?

pH = –Log [H⁺]

9.8 = –Log [H⁺]

Multiply through by –1

–9.8 = Log [H⁺]

Take the anti log of –9.8

[H⁺] = antilog (–9.8)

[H⁺] = 1.58×10¯¹⁰ mol/L

SUMMARY:

1. [H⁺] = 1.58×10¯¹⁰ mol/L

2. pH = 9.8

3. pOH = 4.2

Answer:

table salt

Explanation:

The given unknown sample is not iron as its density is 7.34156 g/cm3.

The density of a material is the way of measuring of how firmly it is packed together. It is expressed as mass per unit volume.

Density is typically classified into two types: absolute density and relative density.

Relative density, also referred to as specific gravity, is the ratio of a material's density to the density of a background material. Water is commonly used as a reference material.

Three of an object's most fundamental properties are mass, volume, and density. Mass describes how bulky something is, volume describes its size, and density is defined as mass divided by volume.

As in the given scenario,

The volume of sample = 2.25(1.5)(2.25) = 7.59375 cm3

We know that,

Density = mass / volume

Density = 55.75 / 7.59375 = 7.34156 g/cm3

Thus, here, one can conclude that the given sample is not iron.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume}\\\)

From the question

volume = final volume of water - initial volume of water

volume = 35 - 8 = 27 mL

We have

\(density = \frac{14}{27} \\ = 0.518518...\)

We have the final answer as

Hope this helps you

1. and C.

Terrycot is a fiber that is made by mixing two fibers. Terrycot is a blended fabric made of terylene and cotton. It has better absorbing power as compared to Terylene. Nylon and terylene are produced through condensation polymeriztation.

Hope it helps...

Answer:

Explanation:

1-B

2-A

3-D

4-C

Process is called Magnetism.

Explanation:

Iron is magnetic, the iron in the mixture will be attracted to the magnet ,leaving the remaining sand in the bowl.