Optical fibres are generally composed of silica, which has a refractive index of 1.44. How
fast does light travel in silica fibre?

The approximate number of moles of hydrogen peroxide at the equivalence point in the 3.00% m/m solution is 0.088 moles.

To approximate the number of moles of hydrogen peroxide at the equivalence point, we need to analyze the given information. The graph in the introduction likely represents a titration curve, where a known concentration of a reagent, in this case, hydrogen peroxide (\(H_2O_2\)), is titrated against a titrant until the equivalence point is reached.

Considering a 3.00% m/m solution of hydrogen peroxide, we know that it contains 3.00 grams of \(H_2O_2\)per 100 grams of the solution. To determine the number of moles of \(H_2O_2\), we need to convert the mass to moles using the molar mass of hydrogen peroxide.

The molar mass of \(H_2O_2\)is approximately 34.02 g/mol. Thus, in a 100-gram solution, there would be (3.00 g / 34.02 g/mol) ≈ 0.088 moles of \(H_2O_2\).

At the equivalence point, the number of moles of the titrant (the solution being added) is equal to the number of moles of the analyte (the substance being titrated). Therefore, the approximate number of moles of hydrogen peroxide at the equivalence point is also 0.088 moles.

Complete Question: Approximate the number of moles of hydrogen peroxide at the equivalence point in the graph in the introduction, supposing a 3.00% m/m solution. Thus the densities will be- Trial Mass(g) 0.448 0.450 3 Density(g/ml) 0.448 g/ 0.400 ml = 1.12 g/ml 0.450 g/ 0.400 ml = 1.125 g/ml 0.437 g/ 0.400 ml = 1.0925 g/m 0.442 g/ 0.400 ml = 1.105 g/ml 1.11 g/ml 0.437 0.442 Average.

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Answer:

D - combining it's potential energy with it's kinetic energy

Answer:

The process to use this knowledge is explained as below:

Explanation:

1. Farmer should use an indicator to check the pH value of the soil of the field of the farm.

2. If the field or the farm has alkali soil add acid to reduce the pH value.

3. If the soil of the farm is acidic for the crop add alkali to increase the pH value.

4. It will be a neutralization reaction and changes the pH value of the farm.

5. Weather/leeching into the surrounding soil/plant or animal waste will lead to a change in pH value over time.

6. The pH value will need to be regularly monitored and adjusted.

Answer:

A. two or more atoms held together with bonds make up a molecule. 

Explanation:

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Total pressure is defined as the sum of all partial pressures in a container, therefore in our question we have:

Ptotal = 5.76 atm

PO2 = 1.31 atm

PN = 2.22 atm

PAr = 0.77 atm

PCO2 = ?

Since the total pressure is the sum of all partial pressures, if we subtract the partial pressures that we know from the total pressure we will have the value of partial pressure for CO2

5.76 - 1.31 = 4.45

4.45 - 2.22 = 2.23

2.23 - 0.77 = 1.46 atm, this is the Partial Pressure for CO2

Answer:

D. Ruler

Explanation:

Use the formula to find the volume of a cuboid by measuring the length, width, and height and multiplying all of them by each other.

Answer:

Explanation:

WAKE FOR CLIMATE CHANGE IS NOT FAKE

SAVE THE GLACIERS

HELP THE ARCTIC ANIMALS

Answer:

mark me brainlist

Explanation:

Elements Atomic Mass (u)

Hydrogen 1

Carbon 12

Nitrogen 14

Oxygen 16

Sodium 23

Magnesium 24

Sulfur 32

Chlorine 35.5

Calcium 40

actor Atoms Molecules

Definition Most fundamental and smallest part that can exist of an element. Two or more atoms chemically bonded together.

Example Oxygen – O

Phosphorus – P

Sulphur – S

Hydrogen – H Oxygen – O2

Phosphorus – P4

Sulphur – S8

Water – H2O

Structure The smallest particle with properties of an element. Combination of two or more atoms.

Stability An atom may not always be stable in nature due to the presence of electrons in the outer shells. Molecules are formed to attain stability.

Constituent Elements Protons, Electrons & Neutrons Two or more atoms of the same or different elements

Reactivity Except for the noble elements, atoms of all elements showcase a certain level of reactivity. Compared to a molecule, the level of reactivity is less than some valence points are filled by electrons of combined elements.

In the original glucose molecule, which is a six-carbon sugar (C6H12O6), each carbon undergoes specific transformations during various metabolic processes.

Here's an explanation of what happens to each of the six carbons:

Carbon 1: This carbon is involved in the conversion of glucose to glucose-6-phosphate in the process known as phosphorylation. Glucose-6-phosphate can then be further metabolized in glycolysis or stored as glycogen.

Carbon 2: Carbon 2 remains unchanged during glycolysis but becomes important in subsequent reactions, such as the formation of acetyl-CoA during the transition reaction, which connects glycolysis to the citric acid cycle.

Carbon 3: Carbon 3 also remains unchanged during glycolysis but plays a role in the production of pyruvate, a key intermediate in several metabolic pathways, including the citric acid cycle.

Carbon 4: Carbon 4 is involved in the production of two molecules of glyceraldehyde-3-phosphate during glycolysis. Glyceraldehyde-3-phosphate is further metabolized to generate energy or used in other biosynthetic pathways.

Carbon 5: Carbon 5 is another carbon involved in the production of glyceraldehyde-3-phosphate during glycolysis, similar to carbon 4.

Carbon 6: Carbon 6 remains unchanged during glycolysis but becomes crucial in the last step, where it is involved in the production of pyruvate, resulting in the net generation of ATP and NADH.

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Answer:

Micro, milli, deci, deca, mega

Explanation:

the suffix each denote the amount in comparison to a liter

Answer:

Chlorophyll Breaks Down

Explanation:

But in the fall, because of changes in the length of daylight and changes in temperature, the leaves stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible and give the leaves part of their fall splendor.

Answer GREEN CHLOPHYL GOES AWAY

Explanation:

THE RDS, YELLOW, BROWNS, AND PURPLES OF FALL LEAVES ARE TIN THE LEAVES  ALL SPRING AND SUMMER.  IN THE FALL, THE GREEN CHLOROPHYL  WHCIH HAS COVERED THE OTHER COLORS, GOES AWAY AND WE SEE THE OTHER COLORS THAT WERE ALWAYS PRESENT

Answer:

Relative volume of ether to water that should be used for the extraction = 1.205

Explanation:

The extraction/distribution coefficient of an arbitrary solvent to water for a given substance is expressed as the mass concentration of the substance in the arbitrary solvent (C₁) divided by the mass concentration of the substance in water (C₂).

K = (C₁/C₂)

Let the initial mass of the organic substance X in water be 1 g (it could be any mass basically, it is just to select a right basis, since we are basically working with percentages here).

If 94% of the organic substance X is extracted by ether in a single extraction, 0.94 g ends up in ether and 0.06 g of the organic substance X that remains in water.

Let the volume of ether required be x mL.

Let the volume of water required be y mL.

Relative volume of ether to water that should be used for the extraction = (x/y)

Mass concentration of the organic substance X in ether = (0.94/x)

Mass concentration of organic substance X in water = (0.06/y)

The distribution coefficient , Ko (Cether / C water), for an organic substance X at room temperature is 13.

13 = (0.94/x) ÷ (0.06/y)

13 = (0.94/x) × (y/0.06)

13 = (15.667y/x)

(x/y) = (15.667/13) = 1.205

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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Answer:

Explanation:

is insufficient to overcome intermolecular forces.

Answer:

hope this helps

Explanation:

When the process of condensation occurs, the kinetic energy of particles is insufficient to overcome intermolecular forces.

becomes independent of temperature,

becomes exactly equal to the intermolecular forces easily overcomes the intermolecular forces

The mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.

The mole ratio of a reaction is the ratio in which the reactants and products of a given reaction occur for the reaction to proceed to completion.

The mole ratio of a reaction is also known as the stoichiometry of the reaction.

The equation of the two reactions are given below:

\(Mg + 2HCl \rightarrow MgCl_2 + H_2\)

\(Mg + 2CH_3COOH \rightarrow (CH_3COO)_2Mg + H_2 \\ \)

From the equation of the reaction reaction, an equal volume of hydrogen gas will be produced by the two reactions.

Therefore, the mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.

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Explanation: Atoms in Group 2A have 2 valence electron and lose 2 electron to gain an octet. These cations have +2 charge. Transition Metal Cations Electrons are removed from ns subshell before the (n-1)d subshell Fe atom = [Ar]4s23d6 Fe2+ ion = [Ar]3d6 Fe3+ ion = [Ar]3d5 The 4s electrons have been removed.

Answer:

True

Theories change because new technology improves our ability to observe the natural world. answer choices.

Answer:

In a solid the attraction between particles are strong enough to hold all the particles together and are able t vibrate about in fixed positions. In liquids, the particles can slip past one another and tumble around.

Explanation:

Answer:

4.14516129 g/mL

Explanation:

The density can be found with the following formula.

\(d= \frac{m}{v}\)

where \(m\) is the mass and \(v\) is the volume.

We know the mass is 25.7 grams. We must find the volume.

The volume is equal to the volume of water that is displaced. Subtract the initial volume from the final volume.

⇒ final volume - initial volume

The initial volume is 35.5 mL and the final volume is 41.7 mL.

⇒ 41.7 mL - 35.5 mL

⇒ 6.2 mL

The volume of the aluminum piece is 6.2 mL.

Now we know the mass and the volume.

\(m= 25.7 g\\v=6.2 mL\)

Substitute the values into the formula.

\(d=\frac{m}{v}\)

\(d=\frac{25.7 g}{6.2 mL}\)

\(d=4.14516129 g/mL\)

The density of the aluminum sample is 4.14516129 g/mL

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\ \)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{18.0 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{18}{6.02} \\ = 2.99003322...\)

We have the final answer as

Hope this helps you

The standard reaction entropy of N2(g) + 3 H2(g) → 2 NH3(g) is -196.3 J/K·mol.

What do you mean by standard reaction entropy?

Standard reaction entropy (ΔS°) is a measure of the disorder or randomness of a chemical reaction at a constant temperature and pressure. It is defined as the change in the entropy of the system when a reaction occurs under standard conditions. The standard state for a substance is its pure form at a pressure of 1 bar and a temperature of 25°C (298 K).

The standard reaction entropy (ΔS°) of a reaction can be calculated using the standard molar entropies (S°) of the reactants and products. The formula to calculate the standard reaction entropy is:

ΔS° = ΣS° (products) - ΣS° (reactants)

To calculate the standard reaction entropy for the reaction: N2(g) + 3 H2(g) → 2 NH3(g)

S° (N2) = 191.8 J/K·mol

S° (H2) = 130.6 J/K·mol

S° (NH3) = 192.5 J/K·mol

ΔS° = [2(S° (NH3)) - (S° (N2) + 3(S° (H2))]

ΔS° = [2(192.5) - (191.8 + 3(130.6))] J/K·mol

ΔS° = -196.3 J/K·mol

Hence, the standard reaction entropy of N2(g) + 3 H2(g) → 2 NH3(g) is -196.3 J/K·mol.

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In the diagram, we see a distillation process. This is a separation process that takes advantage of differences in the boiling point of a mixture of liquids, so the more volatile liquid will evaporate and be recovered as distillate.

1) The first error seen is that the liquid solution mixture is not heated. In order to separate the liquids, we must heat the mixture by adding heat, and this heat is represented in the diagram with a flame.

2) The second mistake is the position of the thermometer, the thermometer must not be in contact with the liquid, it must be at the height of the bulb so that it is in contact with the vapor.

3) The third error is the exit of the coolant water. The water exchanges heat with the steam, so the steam cools and condenses and the water absorbs the heat, and its temperature increases, so it does not come out cold.

In the following figure we can see the mistakes:

Answer:

False

Explanation:

This is because potential energy is energy that it not used yet.

Answer: ^_^

Explanation:

its because during day time the ball becomes heated up and the air inside it try to come out as the heat air always try to go up swelling up the ball,

so in the evening when the air cools down the ball too cools down and air inside it also cools down making the ball feel soft,

Therefore, a football feels hard on a hot day but feels softer in the evening​

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^_^

Answer:

its because during day time the ball becomes heated up and the air inside it try to come out as the heat air always try to go up swelling up the ball,

so in the evening when the air cools down the ball too cools down and air inside it also cools down making the ball feel soft,

Therefore, a football feels hard on a hot day but feels softer in the evening​

Hope it helped u,

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Explanation:

Answer:

The correct answer -

a. Cd and Pb(NO3)2

b. Redox reactions

c. Pb and Cd(NO3)2

Explanation:

This is the reaction known as the redox or reduction-oxidation reaction of metals. In this particular reaction, there are two reactants Cadmium (III) in solid-state and lead (II) nitrate in the aqueous state. At the end of this reaction, the products that we get are lead (II) in solid-state and Cadmium (III) nitrate in the aqueous state.

cadmium (s)+ lead nitrate (aq) = lead (s) + cadmium nitrate (aq)

Cd (s) + Pb2+(aq) → Pb(s) + Cd2+(aq)

Here, Oxidizing agent is Pb2+ and the reducing agent is Cd.

Water and wind both erode rocks and soil over time, but water is generally more effective at breaking down larger rocks and transporting sediment, while wind is more effective at moving smaller particles such as sand and dust over longer distances.

One similarity between the ways water and wind change rocks and soil over time is that both can cause erosion. Water can erode rock and soil by carrying sediment downstream, while wind can erode rock and soil by blowing sand and dust over long periods of time.

One difference is that water erosion is more likely to create canyons and gorges over time, while wind erosion is more likely to create sand dunes and rock formations such as arches and hoodoos. Water erosion is also more likely to occur in areas with high rainfall or near bodies of water, while wind erosion can occur in any dry and windy environment.

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Answer:

Neutron

Explanation:

Protons have a positive charge

Electrons have a negative charge

Neutrons have a neutral charge

Answer:

Al and Hcl

Explanation:

Reactants are the elements, compounds etc before the arrow