write a net ionic equation for the reaction that occurs when magnesium sulfide and excess hydroiodic acid are combined.

The original volume of HBr that was titrated can be calculated as the ratio of the moles of HBr to its concentration.

To determine the original volume of HBr that was titrated, we can use the concept of stoichiometry and the equation balanced for the neutralization reaction between HBr and KOH.

The balanced equation is:

HBr + KOH → KBr + H₂O

From the balanced equation, we can see that the stoichiometric ratio between HBr and KOH is 1:1. This means that for every mole of HBr, we need an equal number of moles of KOH to complete neutralization.

First, let's determine the moles of KOH used in the titration:

Moles of KOH = 0.500 M × 0.075 L = 0.0375 mol

Since the stoichiometric ratio is 1:1, this also represents the number of moles of HBr that were neutralized.

Now, we can calculate the original volume of HBr using the concentration of the unknown solution:

Moles of HBr = 0.0375 mol

Concentration of HBr = unknown (let's assume it is C mol/L)

Volume of HBr = Moles of HBr / Concentration of HBr = 0.0375 mol / C mol/L

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The fabric remnant is approximately 2449 years old.

The age of the fabric can be determined by using the decay law of radioactive isotopes.

Carbon-14 has a half-life of approximately 5730 years, which means that after 5730 years, half of the initial amount of carbon-14 in a sample will have decayed.

We can use the formula:

N(t) = N0 * (1/2)^(t/T)

where N(t) is the amount of carbon-14 remaining after time t, N0 is the initial amount of carbon-14, T is the half-life of carbon-14, and t is the time elapsed since the death of the organism.

Let's call the time elapsed since the death of the organism "t". We know that the 14C/12C ratio of the fabric remnant is 0.748 of the original value, which means that the amount of carbon-14 remaining is 0.748 times the initial amount. So we can write:

N(t) = 0.748 * N0

Plugging this into the decay formula, we get:

0.748 * N0 = N0 * (1/2)^(t/T)

Simplifying, we get:

(1/2)^(t/T) = 0.748

Taking the natural logarithm of both sides, we get:

ln[(1/2)^(t/T)] = ln(0.748)

Using the logarithm rule that ln(a^b) = b*ln(a), we can simplify the left-hand side to:

(t/T) * ln(1/2) = ln(0.748)

Solving for t, we get:

t = -T * (ln(0.748) / ln(1/2))

Plugging in the value for the half-life of carbon-14 (T = 5730 years), we get:

t = -5730 years * (ln(0.748) / ln(1/2)) ≈ 2449 years

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Answer:

come on i need help

Explanation:

Since the heat of solution of KI is 20.3 kJ/mol, the answer to the question is a. Exothermic, ΔH is positive

There are two types of chemical reactions namely exothermic and endothermic reaction.

Given the heat of solution of KI as 20.3 kJ/mol.

Since it is positive, the reaction is exothermic and  ΔH is positive

Since the heat of solution of KI is 20.3 kJ/mol, the answer to the question is a. Exothermic, ΔH is positive

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Answer:

Mass

Explanation:

The Avian FLU is a health hazard because it may infect humans (question 1), precautions are being placed to contain the spread of this infection is avoid the spread of infected animals (question 2), and public and scientists prevent highly pathogenic strains of avian influenza from spreading to New York State through correct advertise to authorities in suspicious cases.

The avian flu is a viral disease transmitted by bird species which are the main vectors to be controlled to avoid infection in human populations.

Therefore, with this data, we can see that the avian flu is a viral disease transmitted by bird species and represents a serious problem for healthcare.

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Answer: To show the number of atoms present.

Explanation: As in CO² (Carbon dioxide), there is a small 2 next to the symbol "O" (oxygen) to explain that there are two oxygen atoms.

There are several factors that can cause a decrease in the rate of dissolution:

Decrease in temperature: As the temperature decreases, the kinetic energy of the particles decreases, and the rate of dissolution also decreases.

Increase in solute concentration: If the solution is already saturated with solute, then adding more solute will cause it to become supersaturated, which can cause a decrease in the rate of dissolution.

Increase in pressure: Increasing the pressure can force more solute into the solution, but it can also cause an increase in the solubility of the solute, which can cause a decrease in the rate of dissolution.

Decrease in surface area: If the solute is in the form of large particles, then breaking it down into smaller particles will increase the surface area available for dissolution and increase the rate of dissolution. Conversely, decreasing the surface area will decrease the rate of dissolution.

Formation of a precipitate: If the solute is capable of forming a precipitate in the solution, then the rate of dissolution may decrease as the solute is removed from the solution and deposited as a solid.

~~~Harsha~~~

Answer:

Explanation:chlorine

Answer:

D

Explanation:

Answer:

1 mole of Pbd - 239.3 g

1 mole  of H - 1.008 g

1 mole of Pb(NO3)2 - 331.2 g

So D

Explanation:

1 mole of lead nitrate is heavier as it is a compound and is composed of three  different kinds of atoms.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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The colour of the phenol red-containing solution would shift toward yellow.

Carbon dioxide is a colourless and acidic gas that is found in trace amounts in the atmosphere. When it reacts with water, carbonic acid is formed.

One of the properties of an acid is that it has the ability to turn blue litmus paper to red.

When Carbondioxide is used as a reactant, the phenol red-containing solution will shift toward yellow because the pH of the solution is less than 7 and turns blue as carbon dioxide is consumed and the pH of the solution rises to 7 or greater.

Note that acidity is pH of 0- 6 and basic solutions are from 8 - 14 in a pH scale.

Therefore, the colour of the phenol red-containing solution would shift toward yellow.

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The structure of the product formed when compound 3 is the substrate of a laccase-catalyzed reaction would depend on the specific reaction and conditions.

Laccases are oxidoreductase enzymes that catalyze the oxidation of substrates by reducing molecular oxygen to water. The reaction typically involves the removal of electrons from the substrate, resulting in the formation of a radical intermediate that can undergo further reactions.

The structure of the final product would therefore depend on the specific substrate and reaction conditions, including pH, temperature, and substrate concentration. Without further information about the specific reaction, it is difficult to determine the exact structure of the product

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Answer:

1 atm = 101.325 kPa

Therefore, 204 atm = 204 * 101.325 = 20670.3 kPa

Rounded to three significant figures, the pressure of 204 atm is 2.07 x 10^4 kPa.

Answer:

Helium atom

Explanation:

For the RTGs flown by the United States, the radioisotope has been some chemical form of plutonium-238 (238Pu or Pu-238). Plutonium-238 decays primarily by the emission of an alpha particle (a helium atom without its electrons).

For a spontaneous biochemical reaction that is associated with a zero change in entropy (ΔS = 0), the driving force for the reaction is solely the change in Gibbs free energy (ΔG). The Gibbs free energy change (ΔG) of a reaction is related to the enthalpy change (ΔH) and the entropy change (ΔS) by the equation:

ΔG = ΔH - TΔS

When ΔS = 0, the equation simplifies to:

ΔG = ΔH

In this case, the spontaneity of the reaction is determined solely by the enthalpy change. If ΔH is negative (exothermic), the reaction will be spontaneous because the decrease in enthalpy favors the formation of products. On the other hand, if ΔH is positive (endothermic), the reaction will not be spontaneous under standard conditions.

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Answer:

The answer is the first one.

Explanation:

The lower a pH level the higher the the number hydrogen ions present in the acid's container.

ph = - log(H)

4 = - log(H)

- 4 = log(h)

10^-4 = H+

1 * 10^-4 = H +

ph = - log(H)

ph = 2

- 2 = log(H)

10^-2 = H

1*10^-2 = h

Something the power - 2 is 100 times greater than something with the power of -4

Answer:

the guy above is correct

Explanation:

Answer:

Always moving!

Explanation:

matter is composed of very small atoms and molecules that are always in contant motion

The complete table:
Element | Mole | Mass:
Cr | 0.00432 | 0.210 g
Fe | 0.00156 | 87.0 mg
Ti | 1.175×10−3 | 0.0599 g
Hg | 0.00769 | 1.54 Kg

For each element ; Mass = Moles × Molar Mass

1. To find the mass of Cr, use the molar mass of Cr (51.996 g/mol):
  Mass = Moles × Molar Mass
  Mass = 0.00432 mol × 51.996 g/mol = 0.210 g

2. To find the moles of Fe, use the molar mass of Fe (55.845 g/mol):
  Moles = Mass ÷ Molar Mass
  Moles = 87.0 mg × (1 g/1000 mg) ÷ 55.845 g/mol = 0.00156 mol

3. To find the mass of Ti, use the molar mass of Ti (47.867 g/mol):
  Mass = Moles × Molar Mass
  Mass = 1.175×10−3 mol × 47.867 g/mol = 0.0599 g

4. To find the moles of Hg, use the molar mass of Hg (200.592 g/mol):
  Moles = Mass ÷ Molar Mass
  Moles = 1.54 Kg × (1000 g/1 kg) ÷ 200.592 g/mol = 0.00769 mol

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Answer:

Choice D) 1 mL pipet

Explanation:

If you are trying to extract 0.02 mL of HCl, you are going to need a piece of equipment that can measure very small units. Thus, Choice D would be the correct answer.

The given statement "the smaller the value of ka, the stronger the acid, and the larger the value of ka, the weaker the acid" is false. because It should be: the smaller the value of Ka, the weaker the acid, and the larger the value of Ka, the stronger the acid.

The smaller the value of Ka (acid dissociation constant), the weaker the acid, and the larger the value of Ka, the stronger the acid.

This is because Ka is a measure of the extent to which an acid donates a proton (H+) to water molecules to form hydronium ions (H3O+), and the larger the value of Ka, the more readily the acid donates protons, making it a stronger acid.

For example, the Ka of hydrochloric acid (HCl) is approximately 1 x 10^6, which is a very large value, indicating that it is a strong acid that readily donates protons. In contrast, the Ka of acetic acid (CH3COOH) is approximately 1.8 x 10^-5, which is a relatively small value, indicating that it is a weak acid that does not donate protons as readily as HCl.

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Answer:

a

Explanation:

mirrors reflect light

Answer:

a

Explanation:

if you try it you can see it reflex onto whatever is behind the mirror

Answer:

1. HCL, NaI

2. NaCl, KCl

3. CCl4

4. Has a high pH

Explanation:

1. water is polar, and like dissolves like

Hydrochloric acid (HCL) is polar therefore it will dissolve in water

Sodium Iodide (NaI) is also polar therefore it will dissolve in water

Ethane (C2H6) Is non-polar therefore it won't dissolve in water

Oil Is non-polar therefore it won't dissolve in water

2. Same as number 1, because water is polar, the substance has to be polar as well to dissolve in it

Carbon tetrachloride (CCl4) is non-polar therefore it won't dissolve in water

Sodium Chloride (NaCl) is just a fancy name for table salt, what you season food with, it is also Polar therefore it will dissolve in water

Methane (CH4) is non-polar gas, at a normal concentration it won't dissolve in water, at a low enough concentration meeting the correct requirements it can dissolve but for the purpose of your question it will not

Potassium chloride (KCl) is polar therefore it will dissolve in water

3. Gasoline is non-polar therefore non-polar substances will dissolve in gasoline

Carbon tetrachloride (CCl4) is non-polar therefore it will dissolve in gasoline

Sodium Chloride (NaCl) is just a fancy name for table salt, what you season food with, it is also Polar therefore it won't dissolve in gasoline

Sodium hydroxide (NaOH)  is very polar therefore it won't dissolve in gasoline

Potassium chloride (KCl) is polar therefore it won't dissolve in gasoline

4. Not a characteristic of an acid

An acid is a proton donor therefore it can't be that

An acid has a pH value of less than 7 therefore it can't be that either

Based on our previous statement we know that this has to be our answer- Has a high pH

AN acid donates Hydrogen ions which is the same as releasing Hydrogen ions

Answer:

did you mean to add or attach a paper to this? We need more info to help

Explanation:

Answer:Mars, earth, Uranus and Jupiter

Explanation:

On moving from places of high elevation to a place of low elevation, the atmospheric pressure increases as the amount of air over unit area increases.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.

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Answer:

A. Wisconsin

Explanation:

In the graph, Wisconsin has the highest speed limit.

Answer:

B. the forces between the particles

Explanation:

The speed of sound is highly dependent on the "medium" that it is traveling through. The more rigid the medium is, the faster the sound travels. The density of a medium is dependent on the forces between the particles. When it comes to solids, their particles are tightly packed because they have a very strong intermolecular force. Their density is greater too, and due to lack of space, they are "not compressible." This allows the sound to travel faster as well.

Answer:

Acids: react with metals, taste sour

Both: can cause burns, conduct electricity

Basis: react with nonmetals, taste bitter

Explanation:

This is the right answer

Answer:

Acids: react with metals, taste sour

Both: can cause burns, conduct electricity

Basis: react with nonmetals, taste bitter

it's right, I did it.

Answer:

O by excretion of waste and the death of the top consumer

Explanation:

The top consumers in the food web pass energy and matter back to the next trophic level when they excrete waste products and also when they die.

Excretion is the passing out of waste materials of metabolism.

During the death of an organism, organic materials are liberated back into the ecosystem. Carbon is released into the soil, carbon dioxide into the atmosphere etc.

These materials are then recycled back into the ecosystem by the activities of plant and special organisms called decomposers. These organisms feed on dead animals especially.