A student puts 0.020 mol of methyl methanoate into a previously evacuated rigid 1.0 L vessel at 450 K. The pressure is measured to be 0.74 atm. When the experiment is repeated using 0.020 mol of ethanoic acid instead of methyl methanoate, the measured pressure is lower than 0.74 atm. The lower pressure for ethanoic acid is due to the following reversible reaction. CH₃COOH(g) + CH₃COOH(g) ⇔ (CH₃COOH)₂(g)
(b) Assume that when cquilibrium has been reached. 50. percent of the ethanoic acid molecules have reacted.

Answer:

A-Red and blue marbles in the same container.

Explanation:

(Apex)

True.

Yes , Colligative properties depends only on the solute concentration and not on the identity of solute.

Colligative properties are those properties of solutions that depend on the ratio of the number of solute particles to the number of solvent particles in a solution, and not on the nature of the chemical species present.

The definition of colligative properties itself says the above stated statement is true or false .

Colligative properties include vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure.

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Answer:

Explanation:

ALRIGHT EPIC GAMER IM GONNA INTRODUCE YOU TO THE AWESOME WORLD OF THE PERIODIC TABLE

look at this

6

C

Carbon

12.011

ok so this is what one block on the periodic table looks like

the protons and electrons are going to be the smaller number

so the protons and electrons for carbon are 6

but your question does  not ask for electrons so its fine.

How many protons? LOOK AT THE SMALLER NUMBER IN ELEMENT BLOCK ON PERIODIC TABLE.

How many neutrons? Take the bigger number and subtract the smaller number from it. so it would be for carbon: 12.011 - 6 = 12 neutrons.

to find the name of the atom, just count the number of electrons and then look for the element with the same number to find the name

Answer: gas

Explanation: in a solid, particles are close together and neat but in a gas they are flying all over the place

A water surplus occurs when additional water exists after potential evapotranspiration is satisfied by precipitation inputs.Correct option is  C.

A) It occurs when the additional inputs of water into a system are not enough to satisfy potential evapotranspiration.

This option describes a water deficit rather than a water surplus. A water deficit occurs when there is not enough water input to meet the potential evapotranspiration demand.

B) It occurs when the potential evapotranspiration demand cannot be satisfied by precipitation inputs.

This option also describes a water deficit rather than a water surplus. It means that the demand for potential evapotranspiration is not met by the amount of precipitation available.

C) It occurs when additional water exists after potential evapotranspiration is satisfied by precipitation inputs.

This option accurately describes a water surplus. It means that there is excess water available after the potential evapotranspiration demand has been met by precipitation.

D) It occurs when potential evapotranspiration is greater than soil moisture.

This option describes a water deficit rather than a water surplus. If potential evapotranspiration is greater than soil moisture, it means there is not enough water available to meet the evapotranspiration demand.

Therefore, the correct answer is option C. A water surplus occurs when additional water exists after potential evapotranspiration is satisfied by precipitation inputs.

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U has a total of six electrons. This corresponds to carbon (C). A is the second most common element in the atmosphere.

The second most common element in the atmosphere is oxygen (O). E is a noble gas.

Noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Based on the given options, E could be xenon (Xe).

S is an alkali metal.

Alkali metals include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). Based on the given options, S could be sodium (Na).

O is a halogen.

Halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Based on the given options, O could be bromine (Br).

O has an atomic number larger than V but smaller than W.

Based on the periodic table, the atomic number of oxygen (O) is 8, which is larger than the atomic number of vanadium (V) (23) and smaller than the atomic number of tungsten (W) (74).

The charge on an L ion is +2.

The charge of +2 indicates that L must lose two electrons to form the ion. Based on the given options, L could be calcium (Ca).

C has five electrons in its outer energy fever.

Carbon (C) has four valence electrons, not five. This contradicts the given statement, so we need to revisit the deductions.

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The balanced equation is written as

2HCl + Ca(OH)₂ --> CaCl₂+ 2H₂O. From using the mole ratio, the volume of 0.01154 M HCl needed to titrate 20.00 mL of 0.0125 M Ca(OH)₂ is equals to 43.3 mL.

Mole ratio is defined as a ratio between the number of moles of any two components in a balanced chemical reaction/equation. We have, two components Hydrochloric acid, HCl and calcium hydroxide, Ca(OH)₂ for reaction.

Volume of calcium hydroxide solution

V₁ = 20.00 mL = 0.020 L

Molarity of HCl, M₂ = 0.01154 M

Molarity of Ca(oh)₂, M₁ = 0.0125 M

Chemical reaction/equation for components,HCl + Ca(OH)₂-->CaCl₂+ H₂O

Balanced equation is written as

2HCl + Ca(OH)₂ --> CaCl₂+ 2H₂O

Now, mole ratio of HCl to Ca(OH)₂ is 2:1 that is moles of HCl are two times the mol of Ca(OH)₂ to form the respective products. Let V be the needed volume of hydrochloric acid to titrate Ca(OH)₂ solution. Using the molarity formula, Molarity of Ca(OH)₂ = moles of Ca(OH)₂/volume of Ca(OH)₂

=> 0.0125 mol/L = moles of Ca(OH)₂/0.02

=> moles of Ca(OH)₂ = 0.00025 moles

From mole ratio, moles of HCl are required to neutralize, Ca(OH)₂= 0.00025 moles Ca(OH)₂ (2 moles HCl/1 mole Ca(OH)₂ = 0.0005 moles

Now, using molarity formula for HCl,

M₂ = moles of HCl/Volume of HCl

=> 0.01154 Mol/L = 0.0005 moles/V

=> V = 0.0433 L = 43.3 mL ( 1L = 1000 mL).

Hence, required value of volume is 43.3 mL.

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Considering the Dalton's partial pressure, the partial pressure of nitrogen and oxygen is 3.634 atm and 0.966 atm  respectively.

The pressure exerted by a particular gas in a mixture is known as its partial pressure.

So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

\(P_{T} =P_{1} +P_{2} +...+P_{n}\)

where n is the amount of gases.

Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture.

The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present:

\(x_{A} =\frac{n_{A} }{n_{total} }\)

So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:

\(P_{A} =x_{A} P_{T}\)

In this case, the mixture contains 5.4 mol of nitrogen and 1.4 mol of oxygen. So, the total number of moles of all the components present is 5.4 moles + 1.4 moles=  6.8 moles.

Then, the mole fraction of each gas can be calculated as:

So, being 4.6 atm the total pressure of the gas mixture, the partial pressure of each gas can be calculated as:

\(P_{nitrogen} =x_{nitrogen} P_{T}\)= 0.79× 4.6 atm= 3.634 atm

\(P_{oxygen} =x_{oxygen} P_{T}\)= 0.21× 4.6 atm= 0.966 atm

In summary, the partial pressure of nitrogen and oxygen is 3.634 atm and 0.966 atm  respectively.

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Answer:

the option is option(J)

Answer:

1. Healthy and well educated people contribute to their societies in positive way

2. Malnourished and illiterate people cannot contribute much to their respective societies.

Explanation:

When designing a cup of a fixed volume, the designer must be guided by the intended use of the cup.

A cup is a hollow object that is primarily used to drink water. Cups are used in every home. Being a solid shape, the volume of the cup is fixed.

However, the shape and structure of the cup depends on its intended use. Hence, when designing a cup of a fixed volume, the designer must be guided by the intended use of the cup.

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Answer:

protease is an enzyme

Explanation:

It hydrolyse peptide bonds of proteins and also called proteolytic enzymes.

There are several ways in which product loss could occur during a multistep reaction sequence, resulting in a percent yield that is less than 100% are; Reaction incompleteness, Side reactions, Loss during workup and purification, Copper loss evidence, and Filter paper contamination.

If any of the reactions in the sequence are not carried out to completion, it could result in incomplete conversion of starting materials to products, leading to a lower yield.

Side reactions, which are unintended reactions that occur alongside the desired reaction, could also lead to product loss. Side reactions may result in the formation of undesired by-products or the consumption of reactants, reducing the overall yield of the desired product.

The purification steps involved in the multistep reaction sequence, such as filtration, extraction, or washing, could result in product loss.

Evidence of copper loss could be observed during the multistep reaction sequence.

If the filter paper used during the filtration step is not properly washed or dried, it may contain residual water that could contribute to a higher final weight, leading to a percent yield greater than 100%.

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The H₂0 ion concentration of a solution is (1 x 10⁻⁴) mole per liter. To determine the pH of the solution, we can use the equation pH = -log[H+], where [H+] represents the hydrogen ion concentration. The correct answer is A) acidic and has a pH of 4.

In this case, the hydrogen ion concentration is (1 x 10⁻⁴) mole per liter. Taking the negative logarithm of this concentration, we have:

pH = -log((1 x 10⁻⁴)) = -(-4) = 4

Therefore, the solution is acidic and has a pH of 4.

The correct answer is A) acidic and has a pH of 4.

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Answer: Group 18, non-reactive noble gas

Explanation:

This electron configuration denotes the elements Argon. It is at the end of the 3p subshell and we can tell this because it says 6 for the value in 3p. This element is in group 18 and something important about that group is that they are typically non-reactive gases, because they have a full electron shell.

Group 18

non-reactive noble gas

Answer:

15

Explanation:

Stereotypes are generalizations about all members of a group that are usually based on misconceptions, biases, or prejudices.

They often lead to assumptions and preconceptions about certain characteristics or behaviors that are associated with individuals belonging to a particular group. Stereotyping is a cognitive process that simplifies the complexity of the world around us by categorizing people based on certain criteria like race, gender, age, ethnicity, nationality, and so on. Stereotypes can be positive or negative, but they are often harmful as they overlook individual differences and perpetuate discrimination and prejudice. A stereotype can be defined as a standardized mental image that one has of others. The characteristics of a stereotype can be positive or negative. Stereotypes are often used to categorize people based on their appearance, age, race, gender, or occupation. Stereotyping can be both positive and negative.

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Answer:

Well its actually the movement of tectonic plates under the earths surface that when the slide along each other, pull away from each other, or push up against each other they create earth quakes.

Explanation: yes.

C3H7 is the empirical formula for the hydrocarbon. The empirical formula for the hydrocarbon can be determined using the given information about the combustion and the stoichiometry of the reaction.

We need to first calculate the moles of CO2 and H2O produced from the combustion of 7.40 g of the hydrocarbon. From the balanced chemical equation for the combustion of hydrocarbons:

CnHm + (n + m/4)O2 → nCO2 + (m/2)H2O

We can see that one mole of the hydrocarbon will produce n moles of CO2 and m/2 moles of H2O. Using the molar masses of CO2 (44 g/mol) and H2O (18 g/mol), we can calculate the moles of each:

moles of CO2 = 22.7 g / 44 g/mol = 0.515 mol
moles of H2O = 10.8 g / 18 g/mol = 0.600 mol

Next, we need to find the ratio of moles of carbon to hydrogen in the hydrocarbon. This can be done by comparing the moles of CO2 and H2O produced:

moles of C = moles of CO2 = 0.515 mol
moles of H = (moles of H2O) x 2 = 1.200 mol

Note that we multiplied the moles of H2O by 2 because there are two hydrogen atoms in each molecule of H2O. Now, we can divide both moles by the smaller of the two (0.515 mol) to get the simplest ratio of carbon to hydrogen:

C : H = 1 : 2.33 (rounded to two decimal places)

This means that the empirical formula for the hydrocarbon can be written as C1H2.33, which can be simplified by multiplying by a factor of 3 to get the whole number ratio:

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First, we need to convert the given mass of the gas sample from grams to moles. We can do this by dividing the mass by the molar mass. Let's call the molar mass of the unknown gas "M".

Given:mass = 1.44 gV = 0.828 LP = 829 mmHg (which can be converted to atm by dividing by 760T = 51 °C (which canbe converted to Kelvin by adding 273.15)

Converting the pressure to atm:P = 829 mmHg / 760 mmHg/atm = 1.09 atm
Converting the temperature to KelvinT = 51 °C + 273.15 = 324.15

In conclusion, the molar mass of the unknown gas is 55.47 g/mol.

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Answer:

From 13 moles of CuO 4.3 moles of N₂ are formed

Explanation:

Given data:

Number of moles of N₂ formed = ?

Number of moles of CuO react = 13 mol

Solution:

Chemical equation:

2NH₃ + 3CuO     →    3Cu + N₂ + 3H₂O

Now we will compare the moles of CuO and N₂.

                CuO         :              N₂

                   3            :              1

                   13          :           1/3×13 = 4.3 mol

Thus, from 13 moles of CuO 4.3 moles of N₂ are formed.

From 13 moles of CuO 4.3 moles of N₂ are formed.

Given:

Number of moles of CuO react = 13 mol

To find:

Number of moles of N₂ formed = ?

The balanced chemical equation:

2NH₃ + 3CuO → 3Cu + N₂ + 3H₂O

On comparing the moles of CuO and N₂.

CuO : N₂

3 : 1

13 : 1/3*13 = 4.3 mol

Thus, from 13 moles of CuO 4.3 moles of N₂ are formed.

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Answer:

3.15×18

56.7

................

Answer:

The sun is it's darkened phase

Answer:

Irrigation is the artificial process of applying controlled amounts of water to land to assist in production of crops. Irrigation helps to grow agricultural crops, maintain landscapes, and revegetate disturbed soils in dry areas and during periods of less than average rainfall.

Answer: The watering of crop plants in regular intervals is known as irrigation. ... Weeds are unwanted plants thet grows with the crop plants. Weeding means to remove those plants. It is done manually or by machine. Using khurpi it is done manually and using seed drill it is done by machine.

Explanation:

Irrigation is the artificial application of water to the soil through various systems of tubes, pumps, and sprays. Irrigation is usually used in areas where rainfall is irregular or dry times or drought is expected.

Hope it helps

The classifications of the reactions are;

A . Synthesis

B. Decomposition

C. Combustion reaction

D. Single replacement

E. Double replacement

We know that in chemistry, what we call a reaction has to do with the interaction that is taking lace between two or more substances and leads to the production of a new substances. We have to look at the reacts that are here and then know how to classify each one.

In fact the combustion reaction has to do with the burning of a species in air. A single replacement has to do with the substitution of a given specie in a compound with another. A double replacement reaction has to do with a case where the anions interchange cation partners. The synthesis reaction deals with the production of new compounds while the decomposition reaction has to do with the compound into its components.

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Answer: B

Explanation: Because it has 4  things to up down right and left

Answer:

Protons

Explanation:

That would be protons, who have a positive charge to an electron’s negative charge. Their attraction is what keeps an electron inside the atom.

If a solid crystal of KHP (potassium hydrogen phthalate) is accidentally pipetted and goes unnoticed throughout titrations, the Ksp value (solubility product constant) would be artificially higher than the true value.

In a titration experiment, the concentration of dissolved KHP is determined by titrating it with a strong base, such as NaOH.

If a solid crystal of KHP is accidentally pipetted, it will eventually dissolve, increasing the concentration of KHP in the solution.

This higher concentration will then require more titrant (NaOH) to reach the endpoint of the titration. As a result, the calculated Ksp value will be higher than the actual Ksp value of KHP, because it will be based on an artificially increased concentration.
In summary, the accidental inclusion of a solid KHP crystal during titration will lead to an overestimation of the Ksp value. To obtain accurate results, it is essential to ensure that no solid crystals are present in the solution before beginning the titration process.

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