Discuss three evidences that confirm that air is a mixture and not a compound​

The reaction between 2-methyl-2-pentanol and sulfuric acid to yield 2-methyl-2-pentene goes via an elimination reaction

Elimination reactions are those that proceed by the removal of one or more atoms or functional groups from the reactants, resulting in the formation of a new double bond or π bond in a product. An example of an elimination reaction is the dehydration of alcohols.In this particular reaction, 2-methyl-2-pentanol (an alcohol) reacts with sulfuric acid to produce 2-methyl-2-pentene, which is an alkene.

The reaction mechanism proceeds via an elimination reaction, where the OH group and a hydrogen ion (H+) are removed from the reactant, resulting in the formation of a double bond between the adjacent carbon atoms in the product.The reaction can be represented as follows:CH3C(CH3)2CH(OH)CH3 + H2SO4 → CH3C(CH3)2C=CH2 + H2O + H2SO4In conclusion, the reaction between 2-methyl-2-pentanol and sulfuric acid to yield 2-methyl-2-pentene goes via an elimination reaction.

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Answer:

Matter is conserved during a chemical reaction energy or matter.

Answer:

[SO2Cl2] = = 0.015 M [SO2] = = 0.0027 M [Cl2] = = 0.0027 M Q = =   = 4.8 × 10−4

No. Q < Kc, so reaction will shift to the right.

Explanation:

Answer  b

Explanation:

Answer: B. Isotopes of the same element have the same number of neutrons and a different number of protons.

Explanation: Founders Educere answer.

Good luck my fellow summer school students, I love you all.

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Answer: nitrogen and carbon dioxide

Explanation: I hope this helps :)

Neon gas would have the largest partial pressure among the mixture of noble gases based on Dalton’s law of partial pressure and ideal gas law.

By understanding Dalton’s law of partial pressure and ideal gas law, the relationship between the mole fraction and partial pressure can be determined. Dalton’s law of partial pressure states that the total pressure of the mixture of gases is just the same as the pressures that each gas would exert if it were present alone (Chang and Goldsby, 2013).

Ideal Gas Law: P= nRT/V

Let: partial pressure = p and total pressure=P

p_neon + p_argon + p_xenon = P

(n_neon)(RT/V) + (n_argon)(RT/V) +(n_xenon)(RT/V)= (n_total)(RT/V)

Mole fraction is the dimensionless number that expresses the ratio of the number of moles of a specific substance to the number of moles of all the components. Mole fraction can also be equal to the ratio of partial pressure and total pressure.

Mole fraction of neon (x_neon) = p_neon / P

x_neon = (n_neon)(RT/V)/(n_total)(RT/V)

x_neon = (n_neon)/(n_total)

Therefore, the partial pressure of a component is directly proportional to its mole fraction. This means that the higher the mole fraction, the higher the partial pressure is.

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Solids have a definite shape and do not assume the shape of their container and solids are not easily compressed are the key properties of solids in contrast to liquids and gases.

Let's discuss the given options one by one:

Solids may be crystalline (ordered) or amorphous (disordered) - This statement is true. But it's not the key property of solids in contrast to liquids and gases.

Solid can only be crystalline (ordered) - This statement is false. Solids can be either crystalline (ordered) or amorphous (disordered).Solid are easily compressed - This statement is false. Solids are not easily compressed. In contrast to liquids and gases, solids are not easy to compress.

Solid have an indefinite shape and do assume the shape of their container - This statement is false. In contrast to liquids, solids have a definite shape and do not assume the shape of their container. Solid can only be amorphous (disordered) - This statement is false. Solids can be either crystalline (ordered) or amorphous (disordered).

Solid have a definite shape and do not assume the shape of their container - This statement is true. Solids have a definite shape and do not assume the shape of their container. Solid usually have higher densities than liquids - This statement is true. But it's not the key property of solids in contrast to liquids and gases.

Solid usually have lower densities than liquids - This statement is false. Solids usually have higher densities than liquids. Therefore, the key properties of solids in contrast to liquids and gases are "Solids have a definite shape and do not assume the shape of their container" and "Solids are not easily compressed".

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Answer:

Digestion is not an example of combustion. Digestion is an endothermic process where energy is utilized to break down the complex food molecules into simple forms. In a combustion reaction carbon dioxide,water,energy and some by products are released.

Explanation:

Answer:

The number of moles of H₂O is 0.135 mol.

The number of moles of LiClO₄ is 0.0449 mol.

Explanation:

Mole is an important standard unit used for the measurement of large quantities of atoms, molecules, or other particles. One mole is equal to 6.022×10²³ units.

The number of moles of a substance is calculated by:

\(\frac{mass of substance}{molecular weight of substance}\)

To find the number of moles of H₂O:

Mass of H₂O in the sample = 2.43g

The molecular weight of H₂O = 18.02g

Number of moles = \(\frac{2.43}{18.02}\) = 0.135 mol.

To find the number of moles of LiClO₄:

Mass of LiClO₄ given = 4.78g

The molecular weight of LiClO₄ = 106.39g

Number of moles = \(\frac{4.78}{106.39}\) = 0.0449 mol.

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Answer:

0.0449

Explanation:

No probelm

There are 11.6 mmol of iron in 650 mg of iron.

Given the mass of iron as 650 mg. The molar mass of iron is 55.85 g/mol.

We need to calculate how many millimoles (mmol) are present in the given amount of iron.

We will use the following conversion:

1 g = 1000 mg

1 mol = molar mass in grams

1 mmol = 0.001 mol

Number of moles of iron

= 650 mg ÷ 1000 mg/g

= 0.65 g ÷ 55.85 g/mol

= 0.0116 mol

Number of millimoles of iron

= 0.0116 mol ÷ 0.001 mol/mmolar mass of iron

= 11.6 mmol

Hence, there are 11.6 mmol of iron in 650 mg of iron. Therefore, the correct option is A. 11.6 mmol Fe.

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Answer:

S-waves do not pass through the outer core.

Explanation:

S - waves do no pass through the outer core and this suggests that this part of the earth's interior is liquid.

S - waves are secondary waves or shear waves.

They do not pass through fluids which are liquids and gases due to their properties. Unlike P- waves, they are cut off where fluids are present.

Therefore, on studying a seismic wave that permeates through the earth, there is an attenuation of S-waves in the core mantle boundary.

The solution volume of HCl is 13.91 mL and the volume and concentration of NaOH are 15.00 mL and 3.161 M, respectively. Then the required acid concentration is 3.409 M

HCl and NaOH react, then the reaction can be written as follows:

                             HCl + NaOH → NaCl + H₂O

Acids and bases are in a 1:1 mole ratio, which means we can use the following formula:

                                    MaVa = MbVb

with:

Ma = molarity of the acid

Va = volume of acid

Mb = base molarity

Vb = base volume

So, to calculate the molarity of HCl is:

Ma = MbVb/Va

Ma = (3.161)(15.00)/ 13.91

Ma = 3.409 M

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This is a single replamecement reaction, also called single displacemente reaction, since we have the Fe taking the place of H2 and forming a compound with sulfate ion (SO4^-2)

Answer:

4

Explanation:

Speed=Distance/time, so 20/5 divide time divided by distance. so the answer is 4.

The speed of Haley the hummingbird is 4 m/s.

From the question,

We are to calculate the speed of Haley the hummingbird

Speed is given by the formula

\(Speed =\frac{Distance\ traveled}{Time\ taken}\)

From the given information,

The hummingbird can fly from a pansy flower to a hibiscus flower 20 meters away in 5 seconds.

That is,

The bird can cover a distance of 20 meters in 5 seconds.

Therefore,

Speed of the hummingbird = \(\frac{20}{5}\)

Speed of the hummingbird = 4 m/s

Hence, the speed of Haley the hummingbird is 4 m/s.

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Density is defined as the mass of an object divided by its volume. The density of the object is 1.49 g/mL.

Density is a physical property of matter that describes the amount of mass per unit of volume.

It is typically denoted by the symbol "ρ" (rho) and is measured in units of mass per unit volume, such as grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³)

Given:

Mass = 67 g

Volume = 45 mL

Use the formula:

Density = mass / volume

Substitute the given values in the equation:

Density = 67 g / 45 mL

Convert milliliters (mL) to grams (g),

since 1 mL of water has a mass of 1 gram:

Density = 67 g / 45 g

Density = 1.49 g/mL

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A gas is most likely to exhibit ideal gas properties when it is at low pressure and high temperature, where the gas molecules are far apart from each other and are moving around quickly, with weaker intermolecular forces of attraction.

The ideal gas law is a simple equation that relates the pressure, volume, temperature, and number of particles of an ideal gas:

PV = nRT

where P is the pressure of the gas, V is its volume, n is the number of moles of gas present, R is the gas constant, and T is the temperature of the gas in kelvin.

The ideal gas law assumes that the gas molecules have no volume and do not interact with each other. However, in real gases, the molecules do have a finite volume and do interact with each other, so their behavior deviates from that predicted by the ideal gas law. A gas is most likely to exhibit ideal gas behavior when it is at low pressure and high temperature. This is because at low pressures, the gas molecules are far apart from each other and have plenty of space to move around freely without colliding with each other. At high temperatures, the gas molecules have a lot of kinetic energy and are moving around very quickly, so their intermolecular forces of attraction are weaker. As a result, the gas molecules are more likely to behave like independent particles, which is exactly what the ideal gas law assumes.    At high pressures and low temperatures, the gas molecules are packed very closely together and are more likely to interact with each other, which causes them to deviate from ideal gas behavior. Similarly, at low pressures and low temperatures, the gas molecules are not moving around as quickly and are more likely to be affected by intermolecular forces, which again causes them to deviate from ideal gas behavior.

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Answer:

Socratic app

I just learned it

Answer:

1.72 M

Explanation:

Molarity is the molar concentration of a solution. It can be calculated using the formula a follows:

Molarity = number of moles (n? ÷ volume (V)

According to the information provided in this question, the solution has 58.7 grams of MgCl2 in 359 ml of solution.

Using mole = mass/molar mass

Molar mass of MgCl2 = 24 + 35.5(2)

= 24 + 71

= 95g/mol

mole = 58.7g ÷ 95g/mol

mole = 0.618mol

Volume of solution = 359ml = 359/1000 = 0.359L

Molarity = 0.618mol ÷ 0.359L

Molarity = 1.72 M

Answer:

simple

Explanation:

A transform fault or transform boundary is a fault along a plate boundary where the motion is predominantly horizontal.[1] It ends abruptly where it connects to another plate boundary, either another transform, a spreading ridge, or a subduction zone.[2]

Answer:

To avoid spattering

Explanation:

If we are heating a hydrate to drive off the water of crystallization, we must initially heat the hydrate gently, at a lower temperature and then more strongly only after most of the water has been driven off in order to to prevent spattering.

Since we obtain the amount of water by the mass difference, Spattering  decreases the mass of water obtained and ultimately results in a lower percent of water being calculated for the hydrate.

Answer:

Explanation:

the difference is below:

According to the question the reaction A+B→C+D is exothermic.

Reaction in chemistry is a process in which two or more substances interact to form a new substance. Chemical reactions involve the breaking of chemical bonds and the formation of new bonds. Chemical reactions are essential for the formation and breaking of molecules, and are responsible for the production of energy.

a) The reaction A+B→C+D is exothermic.

b) The AH for the forward reaction is the difference between the enthalpies of the products and the reactants. The AH for the backward reaction is the difference between the enthalpies of the reactants and the products.

c) X would represent the position of the activated complex on the graph.

d) The activation energy for the forward reaction is the difference between the enthalpies of the reactants and the activated complex. The activation energy for the backward reaction is the difference between the enthalpies of the products and the activated complex. The forward reaction is expected to be faster because it has a lower activation energy.

e) On the same set of axes, the graph would show a decrease in the activation energy with the use of a catalyst, resulting in a lower energy barrier and faster reaction rates.

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The question requires us to calculate the molecular mass of a gas, given its density (1.2 g/L) and conditions of pressure (745 torr) and temperature (20°C).

Density is defined as the mass of a compound over its volume. From this definition, we can calculate the molecular mass of the gas knowing the density, as given by the question, and the volume of 1 mol of the gas.

We can calculate the volume of a gas considering the equation of Ideal Gases:

where P is the pressure of the gas, V is its volume, n is the number of moles, R is the constant of gases and T is the temperature.

Note that the constant of gases R was given in units of L.atm/K.mol, while the pressure and temperature were given in Torr and °C, respectively. Thus we need to convert these values to the appropriate units.

Knowing that 1 Torr corresponds to 0.00131579 atm:

1 Torr --------------------- 0.00131579 atm

745 Torr ---------------- x

Solving for x, we have that 745 Torr corresponds to 0.980 atm.

To convert the temperature from Celsius degrees to Kelvin, we must add 273.15:

T = 20 + 273.15 K = 293.15 K

Therefore, the pressure and temperature we'll use in our calculation are 0.980 atm and 293.15 K. Also, since we are calculating the molecular mass, we'll consider 1 mol of gas.

Rearranging the equation of ideal gases to calculate the volume and applying the values to the equation, we'll have:

Therefore, the volume of 1 mol of the gas under the conditions given is 24.6L.

Next, we'll use this value to calculate the molecular mass using the density given by the question:

Therefore, the gas given by the question presents 29.5g per mol.

All of the methods (1) to (4) could potentially be used to separate peptides produced by chymotrypsin treatment,

Depending on the specific properties of the peptides and the separation conditions.

(1) Chromatography on a cationic column, at pH=7, could be used to separate peptides based on their charge properties.

(2) Chromatography on an anionic column, at pH=4, could also be used to separate peptides based on their charge properties, but in this case, the pH is lower, and the column is negatively charged, so peptides with a net positive charge would bind less strongly and elute earlier, while peptides with a net negative charge would bind more strongly and elute later.

(3) Size exclusion chromatography could be used to separate peptides based on their size. Peptides that are larger would elute earlier, while smaller peptides would elute later, as they pass through the porous stationary phase.

(4) Electrophoresis could be used to separate peptides based on their charge properties and size. Peptides with a net positive charge would migrate towards the negative electrode, while peptides with a net negative charge would migrate towards the positive electrode.

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Answer:

H2

Explanation:

Hydrogen gas isn't a compound but it is diatomic when found naturally hence the 2

Answer:

boiling water

Explanation:

its hotter

Answer:

The number of moles in 89 grams of KCl is approximately 1.193 moles

Explanation:

A mole of an element or compound, is the quantity of the element or compound that contains 6.022 × 10²³ molecules of the element or compound, such that the molar mass of one mole is dependent on the mass of each molecule of the element or compound that make up the 6.022 × 10²³ particles

The given parameters are;

The mass of the KCl = 89 grams

The Molar mass, MW, of potassium, K = 39.1 g/mole

The Molar mass, MW, of chlorine, Cl = 35.5 g/mole

Therefore, given that KCl, has one K and one Cl, per mole, we have;

The Molar mass, MW, of potassium chloride, KCl = (39.1 + 35.5) g/mole = 74.6 g/mole

\(The \ number \ of \ moles, n=\dfrac{Mass}{Molar \ mass, MW}\)

Therefore, the number of moles of KCl in 89 g, 'n' is given as follows;

n = (89 g)/(74.6 g/mole) ≈ 1.193 moles

The number of moles in 89 grams of KCl, n ≈ 1.193 moles.

Answer: Can i see the question

Explanation:

Answer: