0.3g of an organic compound was kjeldahlised and ammonia evolved was absorbed into 45ml of semi normal solution of sulphuric acid. the residual acid solution was diluted with distilled water and the volume was made up to 150ml . 20ml of this diluted solution required 31ml of 0.05 N NaOH solution for complete neutralization. calculate the percentage of nitrogen in the compound​

The savanna grassy plain environment would best support large land animals like giraffes elephants and lions.

A dry climate with a distinct wet and dry season, as well as moderate to high temperatures is observed in savannas. Grass species which can withstand seasonal droughts and frequent fires, predominate in savanna vegetation. Although they are more widely spaced than in other forested environments, trees and shrubs are still present.

Large land animals thrive in the savanna because it offers a variety of food sources, such as grasses, leaves and fruits, as well as plenty of room to move around and find resources. Animals can see each other clearly and communicate effectively in the open grasslands and the scatted trees and shrubs provide shelter from the sun and wind.

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Answer:

1) Combustion

2)Synthesis

3)Single Replacement

4)Decomposition

5)Double Replacement

6)Synthesis

7)Double Replacement

8)Single Replacement

9)Combustion

10)Decomposition

Explanation:

Remeber, decomposisition is breaking things apart, synthesis is building them, cobusion will always make water and CO2 and will always burn O2, single replacemnt will have 1 thing replaced (single) and double replacement will have 2 things replaced (double).

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Answer:

[HI] = 0.784M

[I₂] = 0.108M

[H₂] = 0.108M

Explanation:

Based on the equilibrium reaction:

H₂(g) + I₂(g) ⇄ 2HI(g)

The equilibrium constant, K, is:

K = 52.8 = [HI]² / [H₂] [I₂]

Where [] are equilibrium concentrations of each gas.

As initial concentration of HI is 1.00M, the equilibrium concentrations of the gases is:

[HI] = 1.00M - 2X

[I₂] = X

[H₂] = X

Replacing:

52.8 = [1.00-2X]² / [X] [X]

52.8X² = 4X² - 4X + 1

0 = -48.8X² - 4X + 1

Solving for X:

X = -0.1899M. False solution, there is no negative concentrations

X = 0.108M. Right solution.

Replacing, equilibrium concentrations are:

[HI] = 1.00M - 2*0.108M

Answer:

a student design and experiment to test

Answer:

The special traits of these breeds often include adaptedness to their particular production environments; for example, they may be resilient to harsh conditions and resistant to endemic dis- eases. Locally adapted breeds play vital roles in the lives of the human populations in their respective local areas.

Explanation:

correct me if I'm wrong

Answer:

production of vitamin D

Answer:

Pot holders are meant to protect your hand from the heat of the pot, and so it would need to be a poor conductor of heat in order to do its job correctly. Silicon dioxide is a solid at room temperature and methanol is a liquid.

1) Convert formula units into moles

Avogadro's number is 6.022*10^23

88.34 mol MgS

Answer: Whats the question?

Approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

The relationship between the initial and final concentrations and volumes must be taken into account.

Given: Initial concentration \((C^1) = 1 M Initial volume (V^1) = 250 mL\)

\((C^2) = 3 M final concentration\)

We can use the equation:

\(C^1 * V^1 = C^2 * V^2\)

Where:

\(V^2\)is the final volume of the solution

Rearranging the equation to solve for V2:

\(V^2 = (C^1 * V^1) / C^2\)

Substituting the given values:

\(V^2 = (1 M * 250 mL) / 3 M\)

\(V^2 = 250 mL / 3\)

\(V^2\) ≈ \(83.33 mL\)

To find the amount of water that needs to be evaporated, we subtract the final volume from the initial volume:

Amount of water to be evaporated = \(V^1 - V^2\)

Amount of water to be evaporated = 250 mL - 83.33 mL

Amount of water to be evaporated ≈ 166.67 mL

Therefore, approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

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Adding sulfuric acid to water will decrease the pH dramatically.option 4.

Sulfuric acid is a strong acid and is a type of acid rain. When five drops of sulfuric acid are added to a sample of water, the pH of water will decrease dramatically. This is because sulfuric acid is a strong acid that is capable of dissociating completely in water, producing a high concentration of hydrogen ions (H+) and sulfate ions (SO4²-). This increase in hydrogen ion concentration lowers the pH of water and makes it more acidic.Acid rain is a type of rain that has a pH lower than 5.6, which is the normal pH of rainwater. The acidity of acid rain is caused by the presence of strong acids like sulfuric acid and nitric acid. These acids are produced when sulfur dioxide (SO2) and nitrogen oxides (NOx) are emitted into the atmosphere by human activities like burning fossil fuels and industrial processes.When these gases react with water, they form sulfuric acid and nitric acid, respectively, which then fall to the ground as acid rain.

Acid rain can have harmful effects on the environment, including the acidification of lakes and rivers, the degradation of forests and soils, and the corrosion of buildings and monuments.To conclude, when five drops of sulfuric acid are added to a sample of water, the pH of water will decrease dramatically.option 4.

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The correct answer is 1.5 m/s

Explanation:

To find the average speed of the movement of a body, for example, the movement of the marble. The first step is to know the total distance traveled and the time of the movement. These two details can be found in the graph presented, in this, the maximum distance (vertical axis) is 15 meters and at this distance, the time is 10 seconds. Now, with this information we can use the formula Average speed = Total distance ÷ Total time.

\(Average speed = \frac{15 meters}{10 seconds}\)

\(Average speed= 1.5 m/s\)

According to this, the correct answer is 1.5 m/s. Also, meters per second or m/s is the correct unit because the distance is provided in meters (m) and the time is provided in seconds (s).

Answer:

1.5ms took the quiz got it wrong but heres the correct answer

Explanation:

The molarity of potassium hydroxide in the resulting solution is 0.129 M.

Molarity of a substance refers to the concentration of a substance in solution, expressed as the number of moles of solute per litre of solution.

According to this question, a student weighs out a 2.17g sample of KOH, transfers it to a 300. mL volumetric flask, adds enough water to dissolve it and then adds water to the 300. mL tick mark.

No of moles of KOH = 2.17g ÷ 56.11g/mol = 0.039 moles

Molarity = 0.039 moles ÷ 0.3L = 0.129 M

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The characteristics of the conservation of energy and momentum allow to find the result for the movement of the balls, the correct answer is:

      D. The mechanical energy of the ball on the left is transferred through

the other balls to the ball on the right.

Mechanical energy is the sum of the kinetic energy and the potential energies. In the case that there is no friction, the mechanical energy is conserved.

The momentum is defined by the product of the mass and the velocity of the body, in an isolated system the momentum is conserved and the shocks can be of two types:

In the case indicated, when removing the ball, it gains a height, therefore if the initial mechanical energy is

          Em₀ = mgh

When it reaches the lowest point, just before it hits the ball its energy is:

           \(Em_f\) = 1 / 2m v²

          Em₀ = Em_f

          v = \(\sqrt{2gh}\)  

collides with the other ball and transfers its momentum in an elastic collision, the balls do not stick, as all the energy of the ball is kinetic, this energy is transferred to each ball until it reaches the last one, where the kinetic energy is transformed into potential energy a increases its height.

Let's analyze the answers:

A. False. This is a collision of particles there are no waves.

B. False. At the lowest point the ball on the left has kinetic energy.

C. False. It is a collision of particles, there are no waves.

D. True. The energy from the elastic collisions is transferred through each ball until it reaches the last ball.

In conclusion, using the characteristics of the conservation of energy and momentum, we can find the result for the movement of the balls, the correct answer is:

      D.  The mechanical energy of the ball on the left is transferred through the other balls to the ball on the right

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Answer:  Mafic rocks are dominated by plagioclase and pyroxene (even if you can't see them with the naked eye) and smaller amounts of olivine. Intermediate rocks are roughly even mixtures of felsic minerals (mainly plagioclase) and mafic minerals (mainly hornblende, pyroxene, and/or biotite). There is little or no quartz.

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Answer:

1. 0.28M

2. 24mL

3. 0.002295moles of NaOH.

Explanation:

1. The 6.0M HCl solution is diluted from 35mL to 750mL, that is:

750mL / 35mL = 21.43 times

The 6.0M HCl solution is diluted 21.43 times, the final concentration is:

6.0M / 21.43 = 0.28M

2. First, we need to convert grams of CuNO3 to moles and then, as molarity is moles per liter we can solve for volume of solution in liters and convert it to mililiters:

Moles CuNO3 -Molar mass 124.9g/mol:

2.49g * (1mol / 124.9g) = 0.020 moles of CuNO3

Volume is:

0.020 moles * (1L / 0.830mol) = 0.0240L * (1000mL / 1L) = 24mL

3. In 13.5mL = 0.0135L of 0.17M NaOH the moles are:

0.0135L * (0.17mol / L) = 0.002295moles of NaOH

The question is incomplete, the complete question is;

In Sample Exercise 10.16, we found that one mole of Cl2 confined to 22.41 L at 0 °C deviated slightly from ideal behavior. Calculate the pressure exerted by 1.00 mol Cl2 confined to a smaller volume, 5.00 L, at 25 °C. (a) First use the ideal-gas equation and (b) then use the van der Waals equation for your calculation. (Values for the van der Waals constants are given in Table 10.3.) (c) Why is the difference between the result for an ideal gas and that calculated using the van der Waals equation greater when the gas is confined to 5.00 L compared to 22.4 L?

Answer:

See explanation

Explanation:

Since we have

For 5.00 L using Ideal gas law;

PV= nRT

P = nRT/V

P = 1 * 0.082 * 298 K/5.00

P= 4.887 atm

Using Van der walls equation;

[P + an^2/v^2] *  [V - nb] = nRT

P = (nRT/ [V - nb]) - (an^2/v^2)

P= 1 * 0.082 * 298/5 - (1 * 0.0562) - (6.49(1^2)/5^2)

P = (24.436/4.9438) - 0.2596

P= 4.683 atm

For 22.4 L

P = nRT/V

P = 1 * 0.082 * 298 K/22.4

P= 1.0909 atm

Using Van der Walls equation;

[P + an^2/v^2] *  [V - nb] = nRT

P = (nRT/ [V - nb]) - (an^2/v^2)

P= 1 * 0.082 * 298/22.4 - (1 * 0.0562) - (6.49(1^2)/22.4^2)

P= (24.436/ 22.3438) - 0.0129

P= 1.081 atm

According to Boyle's law, pressure is inversely proportional to volume. Increase in volume leads to decrease in pressure. Therefore the pressure calculated both by the ideal gas equation and Van der Waals equation at 5.00 L is greater than that calculated using both methods at 22.4 L

The statement which is  given below describe a homogeneous catalyst.

"It is in the same phase as the reactants"

The catalyst which have similar phase to the reactant of the reaction is called homogeneous catalyst.

Mostly in  homogeneous catalyst, catalyst present in liquid form.

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Use reagent f. H2CrO4. Chromic acid is a strong acid used to oxidize alcohols into ketones and carboxylic acids. Chromium trioxide combines with water to produce chromic acid, which is deliquescent, light red or brown in color, and soluble in water.

Lindlar catalyst is a type of heterogeneous catalyst used in organic chemistry for hydrogenation reactions. It is composed of palladium metal supported on calcium carbonate, barium sulfate, or similar materials, and is commonly used in the partial hydrogenation of alkynes to alkenes. The catalyst is named after its inventor, Herbert Lindlar, who developed it in the 1950s.

Lindlar catalyst is a selective catalyst, which means that it allows for the hydrogenation of alkyne functional groups to alkenes while inhibiting further hydrogenation to alkanes. This is achieved by using poisoned or deactivated palladium that restricts the catalyst's activity and allows for partial hydrogenation to occur. This controlled hydrogenation is useful in organic synthesis because it provides a way to selectively reduce alkynes to alkenes without the formation of unwanted byproducts.

Reagent (f) can directly convert given alcohol to its carboxylic acid.

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Taking into account the reaction stoichiometry, 128.4 grams of C are required to produce 10.7 moles of methane.

In first place, the balanced reaction is:

C + 2 H₂ → CH₄

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 1 mole of CH₄ is produced by 12 grams of C, 10.7 moles of CH₄ are produced by how much mass of C?

mass of C= (10.7 moles of CH₄×12 grams of C)÷1 mole of CH₄

mass of C= 128.4 grams

Finally, 128.4 grams of C are required.

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Answer:

Here's a diagram.

Explanation:

Answer:

All stars are formed from collapsing clouds of gas and dust, often called nebulae or molecular clouds. Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-sequence star. Nuclear fusion powers a star for most of its existence.

Explanation:

Answer:

This does not make any sense. You need to give the options.

But I think what you mean is

Which of the following represents a chemical change?

A Mowing of grass

B Sublimation of ice

C Dissolving sugar in water

D Charring of a marshmallow

The answer would be D

Explanation:

A color change is a chemical change and charring a marshmallow means burning it and that will change the color.

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Answer:

51.61% of O in C₂H₆O₂

Explanation:

First find the total mass: C = 12 , H = 1 , O = 16

total mass of C₂H₆O₂ = 12 * 2 + 1 * 6 + 16 * 2 = 62

so total mass of oxygen, O₂ in this is: 16 * 2 = 32

⇒ ( 32 / 62 ) * 100

⇒ 51.61%

Answer:

100

Explanation:

The balanced chemical equation for the combustion of any hydrocarbon in oxygen is:

CₙHₘ + (n + m/4)O₂ → nCO₂ + m/2H₂O

In this case, we don't have a hydrocarbon, but we can assume that the oxygen is reacting with some substance that contains carbon to produce carbon dioxide. Let's assume that the balanced chemical equation for this reaction is:

C + O₂ → CO₂

From the equation, we can see that 1 mole of carbon reacts with 1 mole of oxygen to produce 1 mole of carbon dioxide. The molar mass of oxygen is 32 g/mol and the given mass is 100 g, so we have:

100 g / 32 g/mol = 3.125 mol of oxygen

Since the balanced chemical equation shows that 1 mole of oxygen reacts with 1 mole of carbon dioxide, we can conclude that 3.125 moles of oxygen will produce 3.125 moles of carbon dioxide.

Answer:

As nouns the difference between disorder and dysfunction is that disorder is absence of order; state of not being arranged in an orderly manner while dysfunction is a failure to function in an expected or complete manner usually refers to a disorder in a bodily organ (eg erectile dysfunction), a mental disorder, or the improper behavior of a social group.

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According to the concept of molar concentration, molarity of the solution is 1.525 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

In the given problem, by substituting values in mentioned formula related to moles we get,7.32/4.80=1.525 M.

Thus , the molarity of solution is 1.525 M.

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Answer:

403.2 L of O2

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2KClO3 —> 2KCI + 3O2

From the balanced equation above,

2 moles of KClO3 decomposed to produce 3 moles of O2.

Next, we shall determine the number of mole of O2 produced by the decomposition of 12 moles of KClO3. This can be obtained as follow:

From the balanced equation above,

2 moles of KClO3 decomposed to produce 3 moles of O2.

Therefore, 12 moles of KClO3 will decompose to produce = (12 × 3)/2 = 18 moles of O2.

Thus, 18 moles of O2 is produced.

Finally, we shall determine the volume of O2 produced from the reaction. This can be obtained as illustrated below:

Recall: 1 mole of any gas occupy 22.4 L at STP.

1 mole of O2 occupies 22.4 L at STP.

Therefore, 18 moles of O2 will occupy = 18 × 22.4 = 403.2 L at STP.

Thus, 403.2 L of O2 is produced from the reaction.

The formula for Co3+ is Co3+ because it represents the ion of cobalt that has lost three electrons, leaving it with a 3+ charge.

What is chemical formula and how they are formed ?

A chemical formula is a symbolic representation of a chemical compound that shows the types of elements present in the compound and the relative number of atoms of each element. For example, the chemical formula for water is H2O, which indicates that it is made up of two hydrogen atoms and one oxygen atom.

Chemical formulas are formed by identifying the elements that make up a compound and determining the relative number of each element in the compound. The number of each element is represented by a subscript following the chemical symbol of the element. For example, the chemical formula for methane is CH4, which indicates that there is one carbon atom and four hydrogen atoms in each molecule of methane.

The formula for Se2- is Se2- because it represents the ion of selenium that has gained two electrons, giving it a 2- charge.

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