How many formula units of potassium
sulfide are present in 225 g K2S?

225 g
6.02 x 1023 fun
1 mole
110.26 g
1 mole

[?] × 10²] fun

Answer: what is the question

Explanation:

The term that does not describe a function of the DNA polymerase molecule is synthesis of RNA from a DNA template. DNA polymerase is a group of enzymes that are responsible for catalyzing the formation of DNA strands from nucleotides during DNA replication. This process is known as DNA polymerization.

The following are the functions of DNA polymerase molecule:Initiation: DNA polymerase molecule is used to initiate DNA replication process.  

It helps to recognize the origin of replication and bind to it to open the double-stranded DNA. DNA Synthesis: DNA polymerase enzyme molecule is used to synthesize a new DNA strand by adding nucleotides in a 5' to 3' direction

It extends the primer to form a complementary strand of DNA. Proofreading: DNA polymerase helps in removing the incorrect nucleotides that are paired during replication. This proofreading activity is also known as exo nuclease activity.

Repair: DNA polymerase is used to repair the DNA damaged by UV radiation, chemical agents or by other reasons.

It helps to fill the gaps or breaks in the DNA structure.  

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Answer: force velocity

Explanation:

Answer:m = 31.284 grams

Explanation:

Given that,

The dimension of a magnesium block is 2.00 cm  x 3.00 cm x 3.00 cm.

The density of magnesium is, d = 1.738 g/cm³

We need to find the mass of the magnesium block. We know that the density of an object is given by its mass per unit its volume. So,

So, the mass of the block is 31.284 grams.

Explanation:

The mass of the magnesium block that measures 2.00 cm × 6.00 cm × 5.00 cm is 31.284 grams.

Mass is the quantity of matter in a physical body. The product of the molar mass of the compound and the moles of the substance are defined as mass.

A body's mass is an inherent quality. Before the discovery of the atom and the field of particle physics, it was conventionally thought to be related to the amount of matter in a physical body.

The dimension of a magnesium block is 2.00 cm x 3.00 cm x 3.00 cm.

The volume is 2.00 cm x 3.00 cm x 3.00 cm = 18 cm³

The density of magnesium is, d = 1.738 g/cm³

We need to find the mass of the magnesium block. We know that the density of an object is given by its mass per unit of its volume.

Mass = density x volume

1.738 g/cm³ x 18 = 31.284 grams.

Therefore, the mass of the block is 31.284 grams.

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Answer:

145°C is allowed

Explanation:

step step by step explanation

The solute that maintains the medullary interstitial fluid osmotic gradient in the kidneys is urea. Urea is a waste product formed during the breakdown of proteins in the liver and is excreted through urine.

It plays a crucial role in the concentration of urine and the maintenance of water balance within the body. In the kidneys, the medullary interstitial fluid is important for the process of urine concentration.

The descending limb of the loop of Henle is permeable to water, allowing water to move out of the tubules and into the interstitial fluid. However, the ascending limb is impermeable to water but actively transports solutes such as sodium and chloride out of the tubules.

As sodium and chloride ions are transported out of the ascending limb, urea is left behind, increasing its concentration in the medullary interstitial fluid.

This high concentration of urea creates an osmotic gradient, which is essential for the reabsorption of water from the collecting ducts. The osmotic gradient allows water to move out of the collecting ducts and into the surrounding interstitial fluid, leading to concentrated urine.

In conclusion, urea is the solute that helps maintain the medullary interstitial fluid osmotic gradient in the kidneys. Its presence in high concentrations in the medullary interstitial fluid is crucial for the concentration of urine and the regulation of water balance within the body.

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Sample A is a mixture. The formation of two separate clear layers when cooled and then disappearing when returned to room temperature indicates that there are two different substances present in the sample. The density of the liquid at 0.77 g/mL also suggests that it may be a mixture as pure substances typically have specific densities.

Sample B is a pure substance. The fact that the same amount of water is needed to dissolve both subsamples in both trials suggests that they are both the same substance. Additionally, the fact that they are both yellow cubes with the same mass further supports the idea that they are a pure substance. The slight variation in the amount of water needed to dissolve the subsamples could be due to variations in the density of the solid cubes or slight differences in the solubility of the subsamples.

Overall, the experiments conducted on both samples suggest that Sample A is a mixture and Sample B is a pure substance.

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The mass (in grams) of nitric acid, HNO₃ that can be prepared from the reaction of 54 g of NO₂ with 138 g of H₂O is 49.3 g

First, we shall determine the limiting reactant. This obtained as follow

3NO₂ + H₂O -> 2HNO₃ + NO

From the balanced equation above,

138 g of NO₂ reacted with 18 g of H₂O

Therefore,

54 g of NO₂ will react with = (54 × 18) / 138 = 7 g of H₂O

Now we can see that only 7 g of H₂O reacted out of 138 g given.

Thus, the limiting reactant is NO₂

Finally, we shall determine mass of nitric acid, HNO₃ prepared. Details below:

3NO₂ + H₂O -> 2HNO₃ + NO

From the balanced equation above,

138 g of NO₂ reacted to produce 126 g of HNO₃

Therefore,

54 g of NO₂ will react to produce = (54 × 126) / 138 = 49.3 g of HNO₃

Thus, the mass of mass of nitric acid, HNO₃ prepared is 49.3 g

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Answer:

1.087

Explanation:

FULL ANSWER:

0.001087 kg =   1.087

25 mL =  0.025  L    

531 ms =  0.531 s    

Answer: To determine the correct subscripts in a chemical formula, you have to solve how many atoms you need to balance the charge.

For example if I had the compound Calcium Fluoride I would look at the periodic table and see that Calcium's ionic formula is

C

a

2

+

. How do I know this? Well all elements want to have 8 valance electrons so they can be stable(happy). Seeing that Calcium has 2 valance electrons it is going to give away 2 electrons because that is easier than gaining 6 to be happy. Since Calcium has given away 2 electrons it has two more protons than electrons. We know that Protons have a Positive charge, Electrons have Negative charge, and the number of electrons is equal to the atomic number of an element in its pure non-ionic state. (Meaning it doesn't have a positive or negative charge; it is balanced.)

So if calcium gave away two electrons, it will have two more protons than an electron giving it a (2+) charge. The same process can be applied to Fluoride. Since fluoride is one to the left of the noble gases(group 18 or 8A) on the periodic table we know that it has 7 valance electrons because it is in group 7A or 17.

Knowing that we have 7 electrons the fluoride atom will gain an extra electron. Since the fluoride atom gained an extra electron it will have one more negative charge than a positive making it a

^

(

−

)

ion.

So you know that Calcium has a 2+ charge and that fluoride has a 1- charge, you then need these ions to balance out. So you need two fluorine atoms with a 1- ions to balance out the 2+ ion of calcium. Your final answer would be

C

a

F

2

because you need two fluorine atoms to balance out the 2+ charge of the calcium.

Final Tip: Determine the charges then inverse the charges, remove the positive and negative superscipts, and write the charge numbers as a sub script. Ie. Calcium Fluoride

C

a

2

+

and

F

−

inversing and removing the charge signs would give you

C

a

F

2

Explanation:

The mass of oxygen is 128 g

Given that a sample of gas consists of oxygen (molecular mass 32.0 g/mol) and neon (20.0 g/mol). The sample has a mass of 226 g and contains a total of 8.00 moles of gas. We are required to find the mass of oxygen in the sample.

Let us suppose that the number of moles of oxygen is x. Now, we know that the total number of moles of gas is 8 moles. Therefore, the number of moles of neon is (8 - x).

Molar mass of oxygen = 32 g/mol

We can calculate the mass of oxygen from the number of moles of oxygen and molar mass of oxygen as follows:

Number of moles of oxygen × Molar mass of oxygen = Mass of oxygenx × 32 = Mass of oxygen

Let us find the mass of oxygen:

Mass of neon = Total mass of gas – Mass of oxygen

226 – Mass of oxygen = Mass of neon

226 – Mass of oxygen = (8 – x) × 20

Simplifying the equation:

226 – Mass of oxygen = 160 – 20x + x

226 – Mass of oxygen = 160 – 19x

Mass of oxygen = 66 – 19x

The total number of moles of gas is 8 moles

Hence, Number of moles of oxygen + Number of moles of neon = Total number of moles of gasx + (8 - x) = 8⇒ 8 = 8Therefore, the value of x = 4

We can calculate the mass of oxygen as follows:

Number of moles of oxygen × Molar mass of oxygen = Mass of oxygen

4 × 32 = 128 g

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Answer:

Explanation:

False. The greater the concentration, the lower the freezing point.

Answer:

colloids

Explanation:

Answer:

Changes in colour of litmus paper.

Noe

PH values:-

K is acidic as pH is <7

Hence K will change the colour of blue litmus paper.

#B

Examples of substances

Answer:

plastic

Explanation:

plastic doesn't conduct electricity

Answer: 7.81 mol HgO (How many moles of mercury(II) oxide, HgO, are needed to produce 125 g of oxygen, O2?)

Explanation:

The pH of the solution will be 10.47.

The pH of a solution is mathematically given as:

 pH = - log [\(H^+\)] of -log [\(H_3O^+\)]

Thus, in this case, with  [\(H_3O^+\)]  of 3.4 x 10-¹¹ M:

pH = -log 3.4 x \(10^-^1^1\) = 10.47

Thus, the pH of the solution will be 10.47.

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The concentration of the substance in the flask will be lower than desired if distilled water is accidentally added to just above the mark.

When preparing a solution in a volumetric flask, it is important to add the solvent (usually water) first, then add the solute (substance to be dissolved) until the desired concentration is reached, and finally add enough solvent to bring the solution up to the mark on the flask. If distilled water is accidentally added above the mark, the volume of the solution will be greater than desired and the concentration of the solute will be lower.

This is because the amount of solute remains the same, but the volume of the solution has increased. Therefore, the concentration, which is defined as the amount of solute per unit volume of solution, will be lower than desired. To achieve the desired concentration, more of the solute will need to be added to the solution.

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There are total three laws of newtons, first law of newtons, second law of newton and third law of newton. Therefore, for every action there is an equal and opposite reaction.

Newton's first law is also called law of inertia. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Third law of newton states  that for every action there is an equal and opposite reaction.

Therefore, for every action there is an equal and opposite reaction.

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Surface-activated silicon wafers were bonded firmly and void-free by MMR Howlader from room temperature to annealing at 600 °C, followed by analysis of the interface's optical, electrical, mechanical, and nanostructure properties.

What is annealing?

In the fields of metallurgy and materials science, annealing is a heat treatment that modifies the physical and occasionally chemical properties of a material to enhance its ductility and decrease its hardness, making it more workable.

Annealing is a heat-treatment procedure that modifies a material's physical, and occasionally chemical, properties to improve ductility and decrease hardness to make it more workable.

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Answer: transformers, generators ,inductors, electric motors

Explanation:

Answer:

when the coal is heat with presence of oxygen it's called combustion...

People leaving a classroom and going to different classrooms: This is a process of diffusion, where particles move from an area of high concentration to an area of low concentration. The sign for this process is negative because it results in a decrease in the concentration of particles in the initial area.

Stacking sheets of paper: This is a process of increasing order or organization, and it does not involve any significant change in energy. Therefore, the sign for this process is neither positive nor negative.

Dissolving salt in water: This is a process of dissolution, where salt crystals break down into individual ions and become surrounded by water molecules. This process involves the transfer of energy between the system and the surroundings. The sign for this process is negative because it releases energy to the surroundings.

Burning sugar: This is a process of combustion, where the sugar molecules react with oxygen in the air to produce carbon dioxide and water, releasing a large amount of energy. The sign for this process is highly positive because it involves a significant increase in energy as the bonds in the sugar molecules are broken and new bonds are formed.

Moving a pencil from one side of a desk to another: This is a process of physical movement that does not involve any significant change in energy. Therefore, the sign for this process is neither positive nor negative.

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If the half-life of radioactive ⁷²₃₃As is 26.0 h, the time interval (in h) for the activity of a sample of this isotope to decrease by 79.5% from its original value is 59.47 h.

Half life of ⁷²₃₃As is 26 h.

Time taken by this sample to reduce to 79.5 % of its original value.

Let n₀ = Original amount of this radioactive substance

Now Let after time = t , this sample is reduced to 79.5 % of its original value.

Let n(t) = value of substance at time t

n(t) = n₀ - 79.5 % of n

n(t) = n₀  (\(1 -\frac{79.5}{100}\))

n(t) = 0.205 n₀

Applying Half life equation in terms of decay constant 'λ'

λ = \(\frac{2.303}{t}\) log (\(\frac{n0}{nt}\))

We can express decay constant in terms of Half life

Relation t(1/2) = 0.693 / λ

given value of half life t(1/2) = 26h

26 h = 0.693 / λ

λ = 0.693 / 26

\(\frac{0.693}{26h} = \frac{2.303}{t} log (\frac{n0}{nt})\)

n = 0.205 n

\(\frac{0.693}{26h} = \frac{2.303}{t} log (\frac{n0}{0.205 nt})\)

t = 59.47 h

So, time taken to reduce to 79.5 % from its original value is 59.47 h.

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2.50 litres of a 10.0 M solution require the preparation of 25.0 moles of ethylene glycol.

Excellent antifreeze, anti-boil, and anti-corrosive qualities are produced when antifreeze and water are mixed in a 50/50 ratio. The proportion of conventional ethylene glycol to water in severely cold conditions can reach 70% antifreeze, 30% water. The maximum antifreeze to water ratio when using DEX-COOL® is 60/40.

moles = concentration (M) x volume (L)

Given that the desired concentration is 10.0 M and the volume needed is 2.50 L, the setup for calculating the total number of moles of ethylene glycol can be written as:

moles = 10.0 M x 2.50 L

moles = 25.0 mol

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Based on the given specific heat capacity of iron, the molar heat capacity of iron =is 25.18 J/mol/°C.

The molar heat capacity of a substance is the amount of heat required to raise the temperature of a unit mole of that substance by one degree.

The molar heat capacity is given by the formula below:

Given the specific heat capacity of a substance, the molar heat capacity is obtained as follows

Molar heat capacity = specific heat capacity * molar mass

specific heat capacity of iron = 0.4498 J/g/°C

the molar mass of iron = 56 g/mol

Molar heat capacity of iron = 0.4498 J/g/°C * 56 g/mol

Molar heat capacity of iron = 25.18 J/mol/°C

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The concentration, in grams per liter, of a solution prepared by dissolving 0.00040 mol HCl in 2.2L H₂O is 0.0066 g/L.

Mass of any substance will be calculated by using their moles as:
n = W/M, where

W = required mass

M = molar mass

GIven moles of HCl = 0.00040 mole

Mass of 0.00040 mole of HCl will be calculated as:

W = (0.00040mol)(36.45g/mol) = 0.01458g

Given volume of Water = 2.2 L

Now the concentration in molality (g/L) will be calculated as:

concentration = (0.01458g) / (2.2L) = 0.0066 g/L.

Hence required concentration is 0.0066 g/L.

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Answer: first one is 0.0066 and second one is 6.6

Explanation:

I got it right