The lattice energy of kf is -821 kj/mol. When 3. 455 g of kf is dissolved in water, 1. 05 kj of heat is released. Calculate the enthalpy of hydration of kf

Answer:

Because something that experiences change in magnitude or the direction of the velocity is said to be acceleration .

Explanation:

Ammonium nitrate , NH₄NO₃ dissolves spontaneously and endothermically in water because the temperature of solution decreases.  

When we add ammonium nitrate ,  NH₄NO₃ to water at 298 K , it dissolves spontaneously and the temperature of system decreases. this means the heat is absorbed by the system and when the heat is absorbed by the system the process is called as endothermic.  the ammonium nitrate when dissolve in water it will dissociates in to ions which requires the energy so heat is absorbed. this process in endothermic.

Thus, Ammonium nitrate , NH₄NO₃ dissolves spontaneously and endothermically in water because the temperature of solution decreases.

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Answer:

Gas

Explanation:

Because Crude oil can usually be found in the ground as a liquid and in the air is gas can be kerosene.

The clay should be fired at a speed of 1.79 m/s (to two significant figures) in order to stop the car.

To solve this problem, we can use the conservation of momentum principle, which states that the total momentum of an isolated system remains constant. In this case, the initial momentum of the car and the final momentum of the car plus the clay must be equal in magnitude and opposite in direction.

Mass of the car (m1) = 1200 kg

Initial velocity of the car (v1) = 1.8 m/s

Mass of the clay (m2) = 10 kg

Final velocity of the car plus the clay (v2) = 0 m/s (since we want to stop the car)

Using the conservation of momentum principle, we can write:

m1v1 = (m1 + m2)v2

Solving for v2, we get:

v2 = (m1v1) / (m1 + m2)

Substituting the given values, we get:

v2 = (1200 kg x 1.8 m/s) / (1200 kg + 10 kg)

v2 = 1.79 m/s

Therefore, the clay should be fired at a speed of 1.79 m/s (to two significant figures) in order to stop the car.

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(complete question)

a 1200 kg car is rolling at 1.8 m/s. you would like to stop the car by firing a 10 kg blob of sticky clay at it. how fast should you fire the clay? express your answer to two significant figures and include the appropriate units.

Answer:

The set of elements that are not arranged in the order of increasing ionization energy is Mo < Pd < Sn

Explanation:

The force of attraction on the outermost electron of an element can be described by the ionization energy of the element which decreases down a group and increases across a period

1) The given elements Ba, Sr, Ca, are group 2 elements arranged in the order from bottom up, which gives an increasing ionization energy, therefore;

Ba < Sr < Ca is arranged in increasing ionization energy, and therefore, increasing force of attraction of the outermost electron in atoms of the elements

Similarly, Al < P < Cl and Mo < Pd < Sn, are arranged in order of increasing ionization energy

However F < Cl < Br which are arranged from top down of elements in period 17 are arranged in the order of decreasing ionization energy, and therefore, decreasing force of attraction of the outermost electron in atoms of the elements.

The elements that are not arranged in their increasing force of attraction base on the outermost electron present in their atoms is D:

Mo < Pd < Sn.

Therefore , option D is correct.

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Answer:

epic

Explanation:

hakuna matata

Answer:

Answer is D. Just took the quiz on A P E X

Explanation:

If oxidation states change, it is a redox reaction. Hence, option D is correct.

Oxidation-reduction reactions are balanced by two half overall chemical equations into an oxidation equation and a reduction equation.

In redox reactions, the half-reactions of oxidation and reduction always occur simultaneously in pairs.

The oxidation half-reaction involved the loss of electrons from a reduced substance (A) to form an oxidized substance (A⁺):

A ⇒ A⁺ + e-

In contraposition, during the reduction half-reaction the oxidized substance (B⁺) gains electrons to form the reduced substance (B):

B⁺ + e- ⇒ B

The overall redox reaction is obtained by the addition of the two half-reactions:

A ⇒ A⁺ + e-

B⁺ + e- ⇒ B

A + B⁺⇒ A⁺ + B

The electrons gained by B are provided by A, which lost the same number of electrons. Thus, the oxidation/reduction reactions are paired.

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Answer:

Activation energy, in chemistry, the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo a chemical transformation or physical transport.

A eukaryotic cell with a truncation mutation that creates an inactive RNA polymerase I enzyme will have a direct impact on the synthesis of A. rRNA.

RNA polymerase I is responsible for transcribing the rRNA genes, which are then processed and assembled with proteins to form the ribosomes. Ribosomes are essential for protein synthesis and are composed of rRNA molecules and ribosomal proteins. Without functional RNA polymerase I, the cell cannot produce rRNA, which will ultimately result in impaired ribosome biogenesis, a decreased number of ribosomes, and reduced protein synthesis.
The inactivation of RNA polymerase I will not affect the other types of RNA, such as tRNA, snRNA, or hnRNA. tRNA is synthesized by RNA polymerase III, while snRNA and hnRNA are synthesized by RNA polymerase II. These RNA molecules perform different functions in the cell, such as splicing and processing mRNA (snRNA), transporting amino acids during protein synthesis (tRNA), and serving as the precursors for mRNA (hnRNA). Therefore, the inactivation of RNA polymerase I specifically impacts the synthesis of rRNA, which has a crucial role in the cell's protein synthesis machinery.

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The high-energy hot chocolate particles transfer some of their energy to the spoon particles, which causes the spoon to become warmer.

Answer:

D (32.7%)

Explanation:

Answer:D (32.7%)

Explanation:

Molecular mass/ empirical formula mass = n

Where n is a whole number.

For the above question, n = 2

The above formula is used to calculate the formula mass of a compound.

Where n, that is the answer, should be a whole number or very close to a whole number.

Molecular mass = 220.771 g/mol

Se molecular weight =78.96

Cl molecular weight = 35

The formula mass = 78.96+35.45 = 114.41

Thus, n = 220/114 = 2

Hence value of n=2  

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Answer:

B) From the car

Explanation:

The car is in motion

Answer: Physical and then chemical

Explanation: Cast iron is porous, meaning that long exposure to water can cause it to soak up the moisture and eventually rust.

Answer:

Nvr XD

Explanation:

Answer:

the world may never know

Explanation:

In this case, the primary structure forms hydrogen bonds to fold itself.

The answer is primary structure.

Answer:

The answer is 4

Explanation:

plz give me brainliest :)

The components of the system are antimony trisulfide used for fuel, ammonium phosphate prevents excessive smoking, potassium chlorine is the key to ignition, it makes the fuel burn. At last, another important component of the system is oxygen, which makes ignition possible. Remember that all combustions need oxygen to happen.

The intersection of the plane (KCD) with the planes of the tetrahedron (triangular pyramid) ABCD will result in two types of intersections: line segments and points.

When the plane (KCD) intersects the base plane (ABC) of the tetrahedron, it will form a line segment. This line segment will be the intersection of the plane (KCD) with the triangle formed by the base vertices A, B, and C. The line segment will lie entirely within the triangle and will connect two points of intersection.

When the plane (KCD) intersects the side planes of the tetrahedron (e.g., the planes ACD, BCD, and KBD), it will result in points of intersection. These points will be the intersection of the plane (KCD) with the respective sides of the tetrahedron. Each side plane will have a single point of intersection with the plane (KCD).

Overall, the intersection of the plane (KCD) with the planes of the tetrahedron will result in line segments when intersecting the base plane and points when intersecting the side planes. The specific location and geometry of these intersections will depend on the positions of the point K and the vertices of the tetrahedron.

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The equation for lactic fermentation after glycolysis is:

           pyruvic acid + NADH → lactic acid + NAD⁺

Skeletal muscles are where lactic acid fermentation takes place. When there is not enough oxygen, lactate dehydrogenase converts pyruvate to lactic acid. Lactic acid accumulation in the muscles causes fatigue. Muscle cells and other bacterial and animal cells engage in a type of anaerobic fermentation.

The metabolic process known as lactic acid fermentation turns glucose or other six-carbon sugars into the metabolite lactate, which is the lactic acid in solution, and cellular energy.

The creation of many food products involves the bacterial process known as lactic fermentation. It serves a critical function in food safety by giving the finished products distinctive scents and textures.

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The original culture density (OCD) of a sample density would be 1,720,000 colony-forming units per unit volume.

The dilution factor is the ratio of the volume of the original sample to the volume of the final diluted sample. In this case, the final dilution factor is 10^-4, which means that the original sample was diluted by a factor of 10,000.

To calculate the OCD, we use the formula: OCD = CFU / Dilution Factor. In this case, the CFU count is given as 172 and the dilution factor is 10^-4.

Using the formula, OCD = 172 / 10^-4, we can simplify the calculation by converting the dilution factor to a whole number. 10^-4 is equivalent to 1 / 10,000.

Substituting the values, OCD = 172 / (1 / 10,000). Dividing by a fraction is equivalent to multiplying by its reciprocal, so OCD = 172 * 10,000.

Calculating the product, OCD = 1,720,000. Therefore, the original culture density of the sample would be 1,720,000 colony-forming units per unit volume.

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The ion in seawater that serves as a buffer is HCO₃⁻ (bicarbonate ion). Option D is correct.

Seawater is a complex mixture of various dissolved salts and ions, including sodium (Na⁺), chloride (Cl⁻), calcium (Ca²⁺), and bicarbonate (HCO₃⁻).

A buffer is the solution which resists changes in pH when an acid or base is added to it. It consists of a weak acid and its conjugate base, or a weak base and its conjugate acid. In the case of seawater, the bicarbonate ion (HCO₃⁻) acts as a buffer.

HCO₃⁻ can act as both a weak acid and its conjugate base. It can donate a proton (H⁺) to act as an acid or accept a proton to act as a base. This ability to accept or donate protons helps maintain the pH of seawater within a relatively narrow range.

When an acid is added to seawater, the bicarbonate ion (HCO₃⁻) can accept the excess protons and convert into carbonic acid (H₂CO₃). This conversion helps to reduce the increase in acidity and prevent a drastic decrease in pH.

Therefore, HCO₃⁻ in seawater acts as a buffer, helping to stabilize and maintain the pH of the water despite the addition of acids or bases.

Hence, D. is the correct option.

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Answer:

when they are cold

Explanation:

particles will only vibrate when they are hot due to heat transfer by conduction and temperature changes as well

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Answer:

particles vibrate more when they are hot.

Explanation:

This is because the heat transfer from one particle to the other causes vibrations in particles of a substance..And if the substance is cold the particles will not move and will be held in a framework

i hope it will clear your concepts...

Answer:

force

Explanation:

Answer:

what dose this mean "_" is there an image that could help?

Answer:

The main problem with Bohr's model is that it works very well for atoms with only one electron, like H or He+, but not at all for multi-electron atoms

Explanation:

Owelle disapprove of the Bohr model because it was primarily for the hydrogen atoms. It couldn't elaborate on spectra of multi-electron atoms.

An electron is a negatively charged subatomic particle.

The main problem with Bohr's model is that it works very well for atoms with only one electron, like H or \(He^+\), but not at all for multi-electron atoms

Hence, Owelle disapproves of the Bohr model.

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There are three kinds of chemically non-equivalent carbons in Mepridine, and four kinds of chemically non-equivalent carbons in Caffeine.

In Mepridine, the three kinds of chemically non-equivalent carbons are:
1) The carbons in the aromatic ring
2) The carbon in the ethyl group
3) The carbon in the methyl group

In Caffeine, the four kinds of chemically non-equivalent carbons are:
1) The carbons in the aromatic rings
2) The carbon in the methyl group attached to the nitrogen
3) The carbon in the methyl group attached to the oxygen
4) The carbon in the ethyl group

It is important to note that chemically non-equivalent carbons are those that are not in the same chemical environment, and therefore have different chemical properties.

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The right answer is: NaOH will react with benzoic acid to form a salt which is soluble in water. Sodium hydroxide (NaOH) interacts with benzoic acid to produce sodium benzoate.

Which is soluble in water, when it is added to a solution of benzoic acid in dichloromethane. In this reaction, benzoic acid is neutralised by the potent base NaOH to produce sodium benzoate, a salt that is more polar and water soluble than benzoic acid. Due to its lower polarity, the dichloromethane layer cannot dissolve the sodium benzoate salt. Hence, using water to extract the salt from the combination makes it simple to do so. A white crystalline organic molecule with the chemical formula C6H5COOH is benzoic acid. It is a typical food preservative that occurs naturally in many different plants and fruits, including cinnamon, prunes, and cranberries.

Food, pharmaceuticals, and cosmetics are just a few of the areas where benzoic acid is used. It is frequently utilised in soft drinks, fruit juices, pickles, and salad dressings as a food preservative since it is excellent against bacteria, yeast, and moulds.

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