3.000 g of compound x with molecular formula c4h6 are burned in a constant-pressure calorimeter containing 25.00 kg of water at 25 degrees c. the temperature of the water is observed to rise by 1.297 degrees c. (you may assume all the heat released by the reaction is absorbed by the water, and none by the calorimeter itself.) calculate the standard heat of formation of compound x at 25 degrees c.

Answer:

Carbon dioxide

Explanation:

Carbon dioxide gas is used by plants for the preparation of food materials. During this food preparation process, plants take up carbon dioxide from the air and give up oxygen.

The element vanadium is a transition element. The 'd' block elements are generally termed as transition elements. They contain partially filled 'd' orbitals.

The electronic configuration of an element represents the arrangement of electrons in atomic orbitals. Each element has its own electronic configuration. It is possible predict the group and period number of elements from the electronic configuration.

The valence electrons of an atom can also be determined from the electronic configuration. The atomic number of 'V' is 23 and its electronic configuration is:

V = 1s²2s²2p⁶3s²3p⁶4s²3d³

Here vanadium is an element in the 5th group and 4th period.

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Your question is incomplete, most probably your question was:

what is the electron configuration of vanadium?

Answer: Unused glucose is stored mainly in the liver as glycogen.

Explanation: The body breaks down most carbohydrates from the foods we eat and converts them to a type of sugar called glucose. Glucose is the main source of fuel for our cells. When the body doesn't need to use glucose for energy, it stores it in the liver and muscles. This stored form of glucose is made up of many connected glucose molecules and is called glycogen. When the body needs a quick boost of energy or when the body isn't getting glucose from food, glycogen is broken down to release glucose into the bloodstream to be used as fuel for the cells.

When the body doesn't need to use glucose for energy, it stores it in the liver and muscles.

Answer:Both atractive and repulsie

Explanation:

Answer:

7.5 m/s²

Explanation:

The following data were obtained from the question:

Initial velocity (u) = 21 m/s

Final velocity (v) = 36 m/s

Time (t) = 2 secs

Acceleration (a) =..?

The acceleration of an object is simply defined as the rate of change of velocity of the object with time. Mathematically, it is represented as:

Acceleration (a) = (final velocity (v) – initial velocity (u)) / time (t)

a = (v – u)/t

With the above formula, we can determine the acceleration of the roller coaster as follow:

a = (v – u)/t

a = (36 – 21)/2

a = 15/2

a = 7.5 m/s²

Therefore, the acceleration of the roller coaster is 7.5 m/s².

Answer:

it depends on the medium and the temperature

Explanation:

The speed of the sound wave has been majorly dependent on temperature and medium of propagation.

Speed can be defined as the distance traveled by the wave in a unit of time. The speed is a scalar quantity and has been independent of the direction.

The speed has been dependent on the medium of propagation of the wave, The transmission has been the transfer of sound energy, the medium with compact structure has been consisted of the higher speed with the medium having distinct particles.

The speed is also dependent on the temperature as the higher temperature has fast vibrating molecules and higher speed, while lower temperature has slow-moving molecules and lesser speed.

The speed of the sound wave has been majorly dependent on temperature and medium of propagation.

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D-, L-, and D-allo-threonine isomers of threonine have no nutritional or other advantages. More often than natural proteins, Thr is utilised to synthesise Thr.

Chiral centres are those to which four distinct atom groups are bound. Carbon a cannot be a chiral carbon since it has three hydrogen atoms connected to it. Since it is doubly linked to oxygen, it is not the carboxyl carbon either. Furthermore, because it is bound to three rather than four separate groups of atoms, the amino nitrogen is ineligible in any case.

Due to the two chiral centres in threonine, there are four potential stereoisomers. Other than being rare in nature, the isomers of threonine (D-, L-, and D-allo-threonine) have no nutritional or other benefit. Nowadays, synthetic Thr is used more frequently than natural proteins to make Thr.

The chiral centres of amino acids can be one or many. Except for glycine, the a-carbon is chiral in all amino acids. There are extra chiral centres in some amino acids. Because there are four distinct groups connected to the carbon atom, these are chiral centres.

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a. The balanced equation for the synthesis of ammonia gas is: N\(_{2}\) + 3H\(_{2}\) → 2NH\(_{3}\).

b. The volume of ammonia gas produced is approximately 1934.74 liters.

To determine the volume of ammonia gas produced, we need to use the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

Given:

Mass of nitrogen = 10 kg

Temperature = 550°C = 823 K

Pressure = 250 atm

First, we need to calculate the number of moles of nitrogen. The molar mass of nitrogen (N\(_{2}\)) is approximately 28 g/mol. Using the given mass of nitrogen (10 kg), we can convert it to grams (10,000 g) and then divide by the molar mass to get the number of moles (357.14 mol).

From the balanced equation for the synthesis of ammonia (N\(_{2}\) + 3H\(_{2}\) → 2NH\(_{3}\)), we know that 1 mole of nitrogen reacts to produce 2 moles of ammonia.

Therefore, the number of moles of ammonia produced is twice the number of moles of nitrogen, which is 2 * 357.14 = 714.29 mol.

Now, we can use the ideal gas law to calculate the volume of ammonia gas. Rearranging the equation, V = (nRT) / P, we can plug in the values:

V = (714.29 mol * 0.0821 L·atm/(mol·K) * 823 K) / 250 atm = 1934.74 L.

So, the volume of ammonia gas produced is approximately 1934.74 liters.

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Civics is the study of the theoretical and practical aspects of citizenship, its rights and duties, the duties of citizens to each other as members of a political body and to the government. Civic responsibility can include participation in government, church, volunteers and memberships of voluntary associations.

Answer:

citizens have civic duties like taxes which help run society

Explanation:

Answer:

sulfur dichloride

Explanation:

SCl2 is the chemical formula for sulfur dichloride. This compound is made of only two elements, so it is a binary compound.

Advantage: mining asteroids in space would be able to gain a larger amount resources from one asteroid then a mine for 1 month and it would be able to some what stop the destruction of earth's natural resources

Disadvantage: finding and asteroid close to earth then stopping it and mining will be very expensive and transporting it back even if calculations were in place to these things then it would will take time for and asteroid to come near

Answer:

Pb (Lead) = 1 atom

N (Nitrogen) = 2 atoms

O (Oxygen) = 6 atoms

Explanation:

Here, we want to get the number of moles of each element present in the given compound

Firstly, we list out the elements

Pb -Lead

N-Nitrogen

O-oxygen

We have 1 mole of lead clearly

For nitrogen, we multiply the subscript outside with the subscript inside. If the inner subscript is missing, we replace by 1

Thus, nitrogen has a total 2 * 1= 2 atoms

Oxygen follows same pattern as nitrogen and we have 2 * 3 = 6 atoms

Answer:

1 cm^3 = 1 mL

Then

400 cm^3 = 400mL

Now convert mL to L

400/1000

0.4liter

You can increase the thermal energy of a substance by heating it. When you apply heat, you are transferring energy from one source to another.

The state of matter of a substance is an extrinsic property, which means that its surroundings can alter it. The state of matter is influenced by physical factors like pressure and temperature. A substance’s temperature rises when thermal energy is applied, changing the substance’s state from solid to liquid (melting), liquid to gas (vaporization), or solid to gas (sublimation).

Sublimation is defined as the property of a substance when it directly converts to a gaseous state from a solid state. Condensation can occur when a substance is subjected to increasing pressure. It may evaporate as a result of a decrease in pressure. Decreased pressure can also cause some forms of rock to melt.

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Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

Since 273 k – 243 k equals 30, the temperature change for an object going from 273 k to 243 k is 30 k.

Colors and temperatures can both be measured in Kelvin: A temperature unit commonly used in science is the Kelvin scale. Lord Kelvin created the scale after realizing the need for one with absolute zero as the zero point, which translates to 0 K as the lowest attainable temperature, or -273,15 °C.

On the Kelvin scale, a body's temperature cannot be negative. Since the Kelvin scale's absolute zero represents the lowest temperature that may exist, it is impossible for it to be negative.

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Among the given options, sulfuric acid (H2SO4) is a diprotic acid.

Here's a brief explanation of each term:

1. Diprotic acid: An acid that can donate two protons (H+) per molecule during the process of dissociation.

2. Sulfuric acid (H2SO4): A strong, diprotic acid that can donate two protons (H+). Its dissociation occurs in two steps:
  Step 1: H2SO4 → H+ + HSO4-
  Step 2: HSO4- → H+ + SO42-

3. Barium hydroxide (Ba(OH)2): A strong base, not an acid. It can accept two protons (H+).

4. Nitric acid (HNO3): A strong monoprotic acid, meaning it can donate only one proton (H+) per molecule.

5. Chloric acid (HClO3): Another strong monoprotic acid, capable of donating just one proton (H+) per molecule.

So, the correct answer is sulfuric acid (H2SO4) as it is a diprotic acid.

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The balanced chemical reaction is Al + 3AgNO3 → Al (NO3)3 + 3Ag.

A balanced chemical equation though has the identical number of atoms from every type inside the reaction on both the reactant chemical equation output sides. In a balanced chemical equation, both the mass and the change were equal.

An organic organization may adjust to changes in its surroundings very easily. It is distinguished by low complexity, low centralization, as well as low formalization. A mechanistic organization, on the other hand, is distinguished by great complexity, high centralization, as well as high formalization.

Thus, the balanced chemical reaction will be Al + 3AgNO3 → Al (NO3)3 + 3Ag.

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The number of atoms of 3.0 moles of the particle is  1.807 x 10²⁴ atoms K.

Avogadro's number, which is approximately 6.02 x 10^23 atoms per mole, is used to convert between the number of moles of a substance and the number of atoms (or molecules) in that substance.

Given that you have 3.0 moles of K (potassium), you can use Avogadro's number to calculate the number of atoms in 3.0 moles of K:

3.0 moles K x 6.02 x 10^23 atoms K/mole = 1.807 x 10²⁴ atoms K

So, the correct answer is 1.807 x 10²⁴ atoms K

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Answer:

Explanation:

its B 1mole

Reaction for the buffer solution.

CH3NH3+ (aq) + H2O (l) ⇌ CH3NH2 (aq) + H3O+ (aq)

Buffer solutions contain weak acids and their conjugate bases. CH3NH3+ is the weak acid and CH3NH2 is its conjugate base.The equilibrium expression for the above reaction is given as:

pH = pKa + log (A-/HA)

Here,pKa = -log Ka    Ka = acid dissociation constant  

A- = conjugate base

HA = weak acidInitial

pH before addition of NaOH is given by:

pH = pKa + log (A-/HA)pKa = 10.6

CH3NH3+ (aq) + H2O (l) ⇌ CH3NH2 (aq) + H3O+ (aq)

Initial concentration of CH3NH3+ (aq) = 0.459 M

Initial concentration of CH3NH2 (aq) = 0.368 M

So, A- = CH3NH2 and HA = CH3NH3+Hence, pH = 10.6 + log (0.368/0.459) = 10.475

We are now supposed to determine the pH change when 0.099 mol NaOH is added to 1.00 L of the buffer.

The balanced chemical equation for NaOH reacting with CH3NH2 (aq) is given as follows:

NaOH (aq) + CH3NH2 (aq) → CH3NH2- (aq) + Na+ (aq) + H2O (l)

So, the amount of CH3NH2 (aq) consumed is 0.099 mol

The amount of CH3NH3+ (aq) that would be formed is equal to the amount of NaOH (aq) consumed, which is also 0.099 mol.

The new concentration of CH3NH2 is given as:

(0.368 mol/L × 1 L) − (0.099 mol) / 1.099 L = 0.25 M

The new concentration of CH3NH3+ is given as:

(0.459 mol/L × 1 L) + (0.099 mol) / 1.099 L = 0.51 M

So, A- = CH3NH2 and HA = CH3NH3+

Hence, pH = 10.6 + log (0.25/0.51) = 10.221pH after addition − pH before addition = 10.221 - 10.475 = -0.254pH after addition − pH before addition = -0.254 (approx)

Therefore, the pH change when NaOH is added to the buffer is approximately -0.254.

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Two blocks of platinum have a temperature of 200 Celsius. Both the blocks have the same amount of thermal energy because both are metals which conducts heat energy throughout their bodies.

Conduction is the process by which heat energy is transmitted between neighboring atoms or molecules. We know that metals are the good conductors of heat and electricity so if one part absorb heat, it will spread to the whole body so we can conclude that the thermal energy will remain the same amount throughout the whole body.

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Answer:

19

Explanation:

10 + 9 protons plus neutrons

The solvent in the unsaturated solution is NH4Cl. 17. At 70oC, 45 grams of NH4 Cl are dissolved in 100 grams of water to create a solution.

Ammonium chloride, an inorganic compound with the formula NH4Cl, is a white, crystalline salt that is particularly soluble in water. Inside the mineralogic form where it naturally occurs, ammonium chloride is known as sal ammoniac solutions, which have a slightly acidic pH.

Its main use are as an electrolyte in dry cells and as a source of nitrogen for fertilizers. It is also widely used as a component of galvanizing, tinning, and soldering fluxes to remove oxide coatings from metals and so enhance the solder's adherence.

When exposed to ammonium chloride, people may experience discomfort, headaches, nausea, and wheezing. It is also moderately dangerous. The chemical's fume form (Ammonium Muriate Fume and Sal Ammoniac Fume), which is a finely fragmented particulate scattered in the air, is where most exposure occurs.

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Answer:

linear

Explanation:

.....................…...…

Explanation:

bent with an H-0-H angle if 104.5°

Safety goggles being a part of personal protective equipments must be removed when everyone in the room is done handling any chemicals or glassware.

Personal protective equipment is a protective clothing which is worn to protect the wearer's body from hazard or injury.The hazards which can be addressed by the use of personal protective equipment are physical,chemical and bio hazards.

It imposes a barrier between the user and the working environment.The main purpose of personal protective equipment is to reduce exposure of employees to the hazards.

It has a limitation that it does not eliminate the hazard and may lead to harm to the employee if the equipment is damaged.

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