Adding a catalyst to a system at equilibrium lowers the activation energy required by a system, which system, which shifts the equilibrium position toward the products.

True or false?

The relative intensities of a NMR quintet signal can be represented as a series of letters based on the code given. For a quintet signal, the intensities are 1:2:3:2:1, which would be represented as the letters ABCBA.

In nuclear magnetic resonance (NMR) spectroscopy, a quintet signal is a type of signal that occurs when there are five neighboring protons that are coupled to the proton being observed.

The relative intensities of the five peaks in a quintet signal follow the pattern of 1:2:3:2:1. The center peak, or the third peak, is the tallest and has a relative intensity of three.

The two peaks on either side of the center peak have a relative intensity of two, and the outermost peaks have a relative intensity of one.

The relative intensities are related to the number of neighboring protons and the strength of the coupling between them. By analyzing the pattern of peaks in a NMR spectrum, scientists can determine the chemical structure of a compound.

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Answer:

102/46Pd

Explanation:

The mass numbers and the atomic numbers must balance on both sides of the equation. The product side shows a beta particle, indicating that this is a beta decay equation.

Beta decay doesn’t change the mass number of the original atom, so the mass number of the atom on the product side will be the same as the mass number of the atom on the reactant side, 102.

The sum of the atomic numbers on the product side needs to be 45, which is the atomic number of the reactant side. So, the atom on the product side must have a mass number of 46.

Use the periodic table to find the element to be palladium (102/46Pd).

The molar mass of element X is 75 g/mol.

m(X₄O₆) = 59.4 g; mass of the compound

m(O) = 14.4 g; mass of oxygen in the compound

n(O) = 14.4 g ÷ 16 g/mol

n(O) = 0.9 mol; amount of oxygen in compound

m(X) = m(X₄O₆) - m(O)

m(X) = 59.4 g - 14.4 g

m(X) = 45.0 g; mass of element X

Ratio of the elements in the compound: n(X) : n(O) = 4 : 6.

n(X) = 0.9 mol × 4 / 6

n(X) = 0.6 mol; amount of element X in the compound

M(X) = m(X) ÷ n(X)

M(X) = 45.0 g ÷ 0.6 mol

M(X) = 75 g/mol; molar mass of element X

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Answer:

The answer is SiO2

Explanation:

Because nonmetals are those who gain electrons and form ve ions

Explanation:

lpg and oxygen are two gases which are supplied in compressed form in homes and hospitals

Answer:

lpg and oxygen

they are the two gases which are supplied in either a gas form or any other medical forms in homes and hospitals to look after the ill patients or family members

The number of moles of O₂ used to produce 4 moles of NO is 2 moles

First, shall write the balanced equation. This is given below:

N₂ + O₂ -> 2NO

From the balanced equation above,

2 moles of NO were obtained from 1 mole of O₂

With the above information, we can determine the number of moles of O₂ used to produce 4 moles of NO. This can be obtained as follow:

From the balanced equation above,

2 moles of NO were obtained from 1 mole of O₂

Therefore,

4 moles of NO will be obtain from = (4 × 1) / 2 = 2 moles of O₂

Thus, number of mole of O₂ used is 2 moles

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The half life of the sample is 14 hours and the time taken is 97 hours.

We know that radioactivity has to do with the fact that there is element decomposed within a given time frame. Let us note that the half life has to do with the time taken for only half of the radioactive material to remain.

We can see that the time that is taken for only half of the sample to remains is about 14 hours.

We now know that;

N/No = (1/2)^t/\(t_{\frac{1}{2} }\)

N = Number of atoms

No = Initial number of atoms

t = time taken

\(t_{\frac{1}{2} }\) = The half life

Then we have;

2.5/320 = (1/2)^ t/14

7.8 * 10^ -3 = (0.5)^t/14

ln(7.8 * 10^ -3 ) = t/14 ln(0.5)

t = ln(7.8 * 10^ -3 ) / ln(0.5) * 14

t = -4.8/-0.693 * 14

t = 97 hours

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Answer: If the potential energy of a football when hit is 80J, what will its mass in grams be if it reaches a height of 40 meters?

Explanation:

We can use the formula for gravitational potential energy:

PE = mgh

where PE is the potential energy, m is the mass, g is the acceleration due to gravity, and h is the height.

We can rearrange this formula to solve for the mass:

m = PE / gh

Plugging in the given values, we get:

m = 80 J / (9.81 m/s^2 * 40 m)

Simplifying, we get:

m = 0.204 kg

To convert this to grams, we multiply by 1000:

m = 204 g

Therefore, the mass of the football is 204 grams if it reaches a height of 40 meters with a potential energy of 80 J.

{I Hope This Helps! :)}

Recrystallisation is preferred for large-scale production of compounds.

Recrystallization would be the purification method of choice for the production of large amounts of compounds because it is a simpler and more cost-effective method compared to chromatography. Chromatography is a time-consuming process and requires specialized equipment and skilled technicians to perform. It is also more expensive due to the cost of the equipment and consumables. Recrystallization, on the other hand, is a relatively simple process that involves dissolving the compound in a solvent and allowing it to crystallize out as the solvent is cooled. This process can be easily scaled up for large-scale production and requires minimal equipment and resources. Therefore, recrystallization is preferred for large-scale production of compounds.

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Answer:

because the water/air needs to be pumped out.

Explanation:

hoped this helped! (just give it a 1 star if it didn't)

Atomic number = 15 and mass number = 31 where an atom has 15 protons, 15 electrons and 16 neutrons.

An atom consists of a central nucleus that is usually surrounded by one or more electrons.

The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom. Atomic number = Number of protons.

Mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.

Hence, atomic number=15 and mass number=31.

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The titration curves of weak acids and strong acids exhibit distinct differences. Three key distinctions include the pH at the equivalence point, the shape of the curve, and the presence of a buffering region.

      Shape of the Curve: A key difference between weak acid and strong acid titration curves lies in their shapes. A weak acid titration curve typically exhibits a gradual, gentle slope. This is because weak acids only partially dissociate in water, resulting in fewer ions being available for reaction. In contrast, a strong acid titration curve displays a steep slope. Strong acids, such as hydrochloric acid (HCl), completely dissociate in water, generating a high concentration of H+ ions, which leads to a rapid change in pH during titration.

   Equivalence Point: The equivalence point represents the point in the titration where the moles of acid and base are stoichiometrically equal. In a weak acid titration, the equivalence point occurs at a pH higher than 7, typically in the slightly acidic range. This is because the weak acid does not fully dissociate, resulting in a remaining excess of the weak acid even at the equivalence point. In contrast, the equivalence point in a strong acid titration occurs at a pH of 7, representing a neutral solution since strong acids fully dissociate into H+ ions.

   Buffer Region: The buffer region is the part of the titration curve where small additions of acid or base result in minimal changes in pH. In a weak acid titration, the buffer region occurs before and after the equivalence point. This is because the weak acid and its conjugate base form a buffer system that resists changes in pH. In the buffer region, the pH remains relatively constant due to the presence of the undissociated weak acid and its conjugate base. On the other hand, a strong acid titration curve lacks a distinct buffer region since the strong acid completely dissociates, resulting in a negligible concentration of its conjugate base.

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Answer:

C. from the deep ocean to a trench

Answer:

C

Explanation:

ape x

One pretzel contains 72 mg of sodium.

Let's assign variables to represent the amount of sodium in one cracker, one pretzel, and one cookie. Let's say the amount of sodium in one cracker is C, in one pretzel is P, and in one cookie is K.

From the given information, we can form the following equations:

C + P + K = 149 (equation 1)

8P + 8K = 936 (equation 2)

6C + 7P = 535 (equation 3)

To solve for P, we can use equations 2 and 3 to eliminate the variables C and K. By multiplying equation 2 by 3 and equation 3 by 8, we can obtain:

24P + 24K = 2808 (equation 4)

48C + 56P = 4280 (equation 5)

Subtracting equation 4 from equation 5, we get:

48C + 56P - 24P - 24K = 4280 - 2808

48C + 32P - 24K = 1472

Since we know that C + P + K = 149 (from equation 1), we can substitute this value into the equation above:

48(149 - P - K) + 32P - 24K = 1472

Simplifying and solving for P:

7152 - 48P - 48K + 32P - 24K = 1472

-16P - 72K = -5680

16P + 72K = 5680

Solving for P:

16P = 5680 - 72K

P = (5680 - 72K) / 16

To find the value of P, we need to substitute the values of K that satisfy the equations. By trial and error, we find that K = 5 satisfies all three equations.

P = (5680 - 72(5)) / 16

P = 72

Therefore, one pretzel contains 72 mg of sodium.

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Populations of organisms that reproduce asexually tend to show less variation from one individual to another because of their identical chromosomes.

The asexually reproduce organism are those which are reproduced by single parent.  Asexual reproduction does not includes the combination of gametes and they have same no. of chromosomes. Mutation from DNA is not available.  During the process of asexual reproduction , organism inherit the same genome as the mother and impossible to have variation. example are hydra, paramecium, starfish, Planaria, ferns . these are some of the examples of sexual reproduction.

Thus, Populations of organisms that reproduce asexually tend to show less variation from one individual to another because of their identical chromosomes.

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Sodium benzoate is a widely used food preservative. The type of cell that can utilize sodium benzoate as a carbon and energy source is pseudomonas cell.

Psuedomonas cells are simple cell. They are gram-negative or gram-positive bacteria. These cells infect humans, animals, and plants.

They grew on fruits and vegetables. They also infect or contaminate food. So they are very harmful to all living organisms.

Thus, a common food preservative is sodium benzoate. Pseudomonas cells are the only kind of cell that can use sodium benzoate as both a carbon and an energy source.

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Answer:

Consumption of Antacid

Explanation:

At breakfast when Peter ate junk food , excess acid could have got released due to which he had got acidity in his stomach. By consumption of Antacid can reduce the effect of acidity because antacid is a mild base. When a mild base reacts with acid it neutralises the effect of acid & hence gives a relief from acidity...

Answer:

Percent Yield  =  21.4% C

Explanation:

The actual yield is the value that was produced after conducting an experiment. The theoretical yield is the value calculated using the balanced chemical equation.

To find the percent yield, you need to (1) convert moles A to moles C (via the mole-to-mole ratio from equation coefficients) and then (2) calculate the percent yield. It is important to arrange the ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the values given.

3 A + B -----> 2 C + D
^                    ^

7.00 moles A          2 moles C
---------------------  x  ----------------------  =  4.67 moles C
                                 3 moles A

                                 Actual Yield
Percent Yield  =  ------------------------------  x  100%
                              Theoretical Yield

                              1.00 moles C
Percent Yield  =  -------------------------  x  100%
                              4.67 moles C

Percent Yield  =  21.4% C

Answer:

The atomic number which is the number in the left corner and the proton number is the same.

Explanation:

Hope this helps :D

The phenomenon observed when water seeps into the sand in the riverbed groove can be related to certain steps of the water cycle on Earth's surface.

The water cycle, also known as the hydrological cycle, involves the continuous movement of water between the Earth's surface and the atmosphere. The steps of the water cycle being modeled as the water soaks into the sand are evaporation and infiltration.

Evaporation is the process in which liquid water transforms into water vapor, primarily from the Earth's surface. In the context of the sand riverbed, as water is added to the beginning of the groove and seeps into the sand, a portion of it is likely to evaporate. The heat from the surroundings aids in the conversion of liquid water into water vapor.

Infiltration, on the other hand, refers to the movement of water from the surface into the subsurface or soil. As the water is added to the riverbed groove, it percolates through the sand, gradually infiltrating into the pores and spaces between the sand particles.

This process mimics the natural infiltration of water into the ground during rainfall or when water seeps into the soil near rivers or lakes.

By observing the seepage of water into the sand in the riverbed groove, we can draw a parallel to the water cycle's evaporation and infiltration processes.

This modeling demonstrates how water on the Earth's surface can evaporate into the atmosphere and infiltrate into the ground, replenishing groundwater reserves or feeding into natural drainage systems.

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Answer:

Explanation:

is guiZ

ANSWER

EXPLANATION

Given that

The number of moles lithium bromide is 5.5 moles

Firstly, write a balanced equation for the reaction

Find the number of moles of bromine using stoichiometry ratio

Let x represents the number of bromine

The reaction that requires platinum as a catalyst is the  B. reduction of an aldehyde or ketone.

This reaction occurs when an aldehyde or ketone is treated with hydrogen gas in the presence of a platinum-based catalyst. The resulting product is  alcohol. This reaction is important in the production of alcohols, aldehydes, and ketones from their precursors. The catalyst helps to break the chemical bonds of the molecules and increase the reaction rate.

In addition to being used for the reduction of aldehydes and ketones, platinum can also be used to catalyze the oxidation of an aldehyde or ketone. In this reaction, an aldehyde or ketone is treated with an oxidizing agent, such as oxygen or ozone, in the presence of a platinum-based catalyst. This reaction is used to produce carboxylic acids and esters. Both of these reactions require the use of a platinum-based catalyst, which helps to speed up the reaction rate.

In summary, the reaction that requires platinum as a catalyst is the reduction of an aldehyde or ketone. Platinum can also be used to catalyze the oxidation of an aldehyde or ketone. Both of these reactions are important for the production of alcohols, aldehydes, and ketones from their precursors. Therefore the correct option is  B

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Answer:

See explanation

Explanation:

Salt makes ice to melt faster than it usual. Sugar is another substance that influences the melting time of ice.

If i have a sample of pure ice and another sample of ice treated with sugar. I have to maintain the both initially at 0 degrees temperature and have a stop clock to measure the melting time.

I will ultimately notice that the sample of ice treated with sugar will melt faster than the pure sample of ice due to the presence of an impurity.

The given sample of matter has the lowest average kinetic energy is 50g at -55°C and 2.0 atm option - A is correct answer.

The force an object experiences as a result of motion is known as kinetic energy. An object can only accelerate if a force is applied to it. We have to put in the effort to use force. Once the work is done, energy is transferred to the object, which then moves at a new, constant speed.

Kinetic energy, which can be seen in the motion of an object or subatomic particle, is the energy of motion.

The average kinetic energy is the subject of the query. Thus, the only connection is to temperature. Kinetic energy increases with increasing temperature and decreases with decreasing temperature.

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As a result, it is a natural bodily alteration. The chemical shape of the material is affected by physical changes, but not its makeup.

Since natural water undergoes a phase transformation cycle from liquid to gas and back to liquid, the production of clouds is a physical shift.

The physical conversion of water from vapour to liquid during cloud formation is known as condensation. When water evaporates during the evaporation process and condenses in the air to form clouds, there is a physical shift that takes place.

Condensation is the process by which water transforms from a gas to a liquid, whereas deposition is the process by which a gas transforms straight into a solid. Clouds are created by these two processes.

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Answer: a)Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

b) Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

c) Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Explanation:

(a) Balanced formula equation:

(NH₄)₂S + FeSO₄ → (NH₄)₂SO₄ + FeS

Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

(b) Balanced formula equation:

Na₂SO₃ + CaCl₂ → NaCl + CaSO₃

Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

(c) Balanced formula equation:

CuSO₄ + BaCl₂ → CuCl₂ + BaSO₄

Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Step 1

% by mass:

Mass of solute ---- 100 of solution

Mass of solution = mass of solute + mass of solvent = 55.0 g + 137 g = 192 g

Solute = NH4Cl

Solvent = Water (H2O)

-----------------------------

Step 2

Procedure:

55.0 g NH4Cl --------- 192 g solution

X ---------- 100 g solution

X = 29 g NH4Cl = 29 % by mass approx.

Answer: 29 % by mass