A 5.0 g sample of NaCl is added to a Styrofoam cup of water, and the change in water temperature is 4.5 degrees C The heat of solution of NaCl is 3.76 kJ/mol.
what is the mass of the cup?

Depolymerization; Macromolecule-initiated cleavage; Thermal; Photochemical; Mechanochemical; Oxidative; Polymer-burning; Kinetics of cleaving Macromolecules when Chain Depolymerization is Negligible; Degradation in Polymer Recycling; Protection of Polymers Against Degradation.

Catalytic oxidation, hydrogenation, and pyrolysis are some of the methods that can be used to depolymerize lignins all the way down to phenilics.68 Little has been done to exploit these processes in the direction of monomers; instead, the products have been thought of in the context of fuels and commodity or fine chemicals.

Nevertheless, it does not seem improbable that certain degradation pathways followed by functionalization will become feasible in order to synthesize aromatic monomers with original structures that are not easily available from petrochemistry, such as vinyl phenols, p-methoxystyrene for polyaddition reactions, and difunctional aromatic compounds for polycondensations that lead to polyesters, degradation, etc.

Several of these potential uses for lignin-derived monomers have been thoroughly covered in two recent publications.

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The correct option is (C). The approximate final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M is 86 mL (option C).

To find the final volume of the solution, we can use the formula:

C1V1 = C2V2

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Plugging in the values we know, we get:

(8.25 M) (25 mL) = (2.40 M) (V2)

Solving for V2, we get:

V2 = (8.25 M x 25 mL) / 2.40 M
V2 = 86.25 mL

Therefore, the approximate final volume of the solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M is 86 mL (option C).

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Answer:

The answer is lemonade.

Weaker acids are those which tend to have a higher pH from 4 to at least 6 stronger acids have low pH from 2 and below that's from 2 to 0.

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1.  The empirical formula is ZnI₂.

2.  Balanced chemical equation for the reaction between zinc and iodine to form zinc iodide.

                   Zn + 2I → ZnI₂

3.  To find empirical formula, we have to do following steps.

    Step 1: Write given atoms.

    Step 2: Write given masses of corresponding  atoms.  

    Step 3: In next step atomic masses are written respectively.

    Step 4:Number of moles is calculated using,

              Number of Mole= Given mass/Molecular mass

    Step 5: Mole ratio is obtained by dividing with smallest mole.

Empirical formula of given problem is H₂O.

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The molecule represented below is Butane.

looking at the structure give each point represents a carbon atom, placing a C on each point gives you a total of 4, making it to be butane.See picture attached for a vivid illustration of butane.

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Answer:

Butane

Explanation:

i just took tha test

The molar mass and the mole ratio from the reaction equation B. 305.9 grams Al2O3

Molar mass is a physical property of a chemical compound, defined as the mass of a given substance divided by the amount of substance measured in moles. It is expressed in g/mol and is numerically equal to the average atomic weight of the atoms in the compound. Molar mass is used to calculate the mass of a given amount of a substance, as well as to determine the relative atomic mass of an element.

The molar mass of aluminum is 26.98 g/mol, and the molar mass of aluminum oxide is 101.96 g/mol. Using the molar mass and the mole ratio from the reaction equation, we can calculate the amount of Al2O3 produced.
6.000 mol Al x (2 mol Al2O3/3 mol Al) x (101.96 g Al2O3/1 mol Al2O3) = 305.9 g Al2O3

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Answer:

Mass of CO2 WILL BE ~ 9.33 g

Explanation:

Moles of O2 = 14/18

Let the mass of CO2 be x

Then moles of CO2 will be = x/12

moles of CO2 = moles of O2

x/12 = 14/16

x = 9.33 grams

Answer: The forces between you and the rock are balanced

Explanation:

Answer: your answer is A.)

Explanation:

Chloric acid, also known as perchloric acid, is a strong acid that is composed of hydrogen, chlorine, and oxygen atoms. The chemical formula for chloric acid is HClO3.

To write the formula for chloric acid, we first need to understand the elements that make up the compound. The chemical symbol for hydrogen is H, chlorine is Cl, and oxygen is O. In a chemical formula, the elements are represented by their symbols, and the number of atoms of each element present in the compound is indicated by a subscript number.

In the case of chloric acid, there is one hydrogen atom, one chlorine atom, and three oxygen atoms. So, the formula for chloric acid is written as HClO3. This indicates that there is one hydrogen atom, one chlorine atom, and three oxygen atoms present in one molecule of chloric acid. The subscript numbers indicate the ratio of atoms present in the compound and are not meant to indicate the actual number of atoms.

It's important to note that the subscripts are always written in the same order as the chemical symbols, so that the formula for chloric acid is always written as HClO3 and not ClHO3 or any other permutation.

The "H" stands for hydrogen, the first element in the chemical formula, "Cl" stands for chlorine and the "O3" stands for 3 atoms of oxygen. Together they form the chemical compound HClO3 or Chloric acid.

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Explanation:

They have a directly proportional relationship.

i.e.

when one of them varies in magnitude, the others will also vary directly.

Quantities expressed as products of each other are always inversely proportional & those expressed as quotients are directly proportional with each other.

KE = 1/2mv^2

Thus, we know that m & v in KE are inversely related.

Inverse proportionality - when m increases, v decreases. & vice versa.

Direct proportionality - when v increases KE also increases

If Temperature increases then the probability of atoms to randomly collide with each other increases rapidly.

the rapidity of these atoms result from the increase in speed(v). since v & KE have a direct r/n ship, KE also increases. as a result the atoms get a relatively high freedom of movement compared to that of those in solids.

Answer:

velocity

Explanation:

The question requires us to complete the sentences regarding characteristics and properties of lipids.

First, we need to keep in mind what are lipids: these essential molecules to cell's membranes are typically made of a glycerol backbone, fatty acid "tails" (the hydrofobic part) and and a phosphate group (a hydrophilic part). The term "lipids" is commonly used as a synonym for "fats", which it isn't completely wrong as they share many properties (for example, lipids don't mix with water).

As they are organic molecules, all lipids have carbon, oxygen and hydrogen in their structure, while some of them can contain other elements (such as phosphorus for the phospate group and nitrogen).

Considering the information above, we can complete the sentences as:

1. "Lipids is a general term describing organic molecules that are insoluble in water".

2. "All lipids are made of carbon, hydrogen and oxygen, while some lipids contain other elements..."

The pressure after the expansion inside the balloon can be calculated using Boyle's law. When the volume changes from 3.2 L to 3.6 L, pressure changes from 12 Pa to 10.6 Pa.

Boyle's law states that at constant temperature, the volume of a gas is inversely proportional to the pressure of the gas.

hence, PV = a constant.

Let P1 and V1 be the initial pressure and volume and P2 and V2 be the final pressure and volume, then

P1 V1 = P2V2.

Given that,

P1 = 12Pa

V1 = 3.2 L

V2 = 3.6 L

P2 = P1 V1/V2

     = 3.2 l × 12 Pa /3.6 L

     = 10.6 Pa

Therefore, the final pressure  of the gas inside the balloon will be 10.6 Pa.

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The delta H° (enthalpy change) for the reaction 3Fe₂O₃(s) + CO(g) → 2Fe₃O₄(s) + CO₂(g) is 51.0 kJ.

We can use Hess's Law to find the enthalpy change for the reaction;

3FeO(s) + CO₂(g) → Fe₃O₄(s) + CO(g) ΔH° = -18.0 kJ

Fe(s) + CO₂(g) → FeO(s) + CO(g) ΔH° = 11.0 kJ

2Fe(s) + 3CO₂(g) → Fe₂O₃(s) + 3CO(g) ΔH° = 23.0 kJ

First, we can reverse the first equation;

Fe₃O₄(s) + CO(g) → 3FeO(s) + CO₂(g) ΔH° = 18.0 kJ

Then we can multiply the second equation by 3:

3Fe(s) + 3CO₂(g) → 3FeO(s) + 3CO(g) ΔH° = 33.0 kJ

Now we add the three equations together to get the desired reaction;

3Fe₂O₃(s) + CO(g) → 2Fe₃O₄(s) + 3CO₂(g) ΔH° = ?

When we add the equations, the CO and CO2 terms cancel out, and we are left with;

3Fe₂O₃(s) → 2Fe₃O₄(s) ΔH° = 33.0 kJ + 18.0 kJ

= 51.0 kJ

Therefore, the enthalpy change for the reaction is 51.0 kJ

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Answer:

This is an abbreviation for "parts per million" and it also can be expressed as milligrams per liter (mg/L). This measurement is the mass of a chemical or contaminate per unit volume of water. Seeing ppm or mg/L on a lab report means the same thing.

Answer:

The ion will repel the substance because it has lost two electrons.

Explanation:

An ion is a charged specie. We can see from the question that the ion has twelve positive and ten negative particles.

If there are more positive particles than negative particles, then the ion is positively charged.

If the ion is positively charged, it will repel another positively charged particle because like charges repel while opposite charges attract.

Answer:

C. The ion will repel the substance because it has lost two electrons.

Answer: lactate

Explanation:

The missing circulating energy substrate is lactate. Lactate is a product of anaerobic metabolism and can serve as an energy source in certain conditions, such as during intense exercise or in tissues with high glycolytic activity. It can be converted back into glucose through a process known as the Cori cycle and utilized as an energy substrate by various tissues in the body.

Answer:

Potassium (K)

Strontium (Sr)

Magnesium (Mg)

Explanation:

The cation in Potassium Chloride (KCl) is Potassium (K) because of Potassium’s placement on the periodic table it has a charge of +1 while Chlorine has a charge of -1, making it the anion with a 1:1 ratio.

The cation in Strontium Chloride (SrCl2) is Stronitum (Sr) because of Strontium’s placement on the periodic table it has a charge of +2 while Chlorine has a charge of -1, making it the anion but since there are two Chlorines present in the formula, a 1:2 ratio.

The cation in Magnesium Chloride (MgCl2) is Magnesium (Mg) because of Magnesium’s placement on the periodic table it has a charge of +2 while Chlorine has a charge of -1, making it the anion but since there are two Chlorines present in the formula, a 1:2 ratio.

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1. ionic 2. ions 3. covalent 4. single bond 5. double bond 6. Polar covalent 7.non-polar covalent 8. hydrogen

The classification of types of bonds depends on the nature of the interaction between atoms or molecules.

1. A ionic bond forms when one atom gives up one or more electrons to another atom.

2. Atoms or molecules with a net electric charge due to the loss or gain of one or more electrons are ions.

3. A covalent bond involves the sharing of electron pairs between atoms, also known as a molecular bond.

4. When one pair of electrons is shared between two atoms, a single bond is formed.

5. When two pairs of electrons are shared between two atoms, a double bond is formed.

6. A Polar covalent bond is a type of chemical bond where a pair of electrons is unequally shared between two atoms. As a result, one end of the molecule has a slightly negative charge and the other a slightly positive charge.

7. Atoms involved in a non-polar covalent bond equally share electrons; there is no charge separation in the molecule.

8. A weak bond called a hydrogen bond results from an attraction between a slightly positive region in a molecule and a slightly negative region in the same or a different molecule.

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The reaction that demonstrates a chemical change is iron (Fe) reacting to water((H,O)) and oxygen(O) to form iron oxide(Fe2Og). That is option B.

A chemical change is defined as the change that occurs when two substances reacts or combines to form an entirely new product.

The following are the features that shows that a chemical change has taken place. They include:

When the above signs are seems there is every reason to accept the fact that a chemical change has occurred in the chemical reaction that took place.

From the chosen option, the reactants and product of the chemical reaction are:

Iron (Fe) + water (H2O) --> iron oxide(Fe2Og)

This reaction is a chemical reaction as the product formed leads to a colour change known as rust.

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The pH of the solution after adding 0.05 mol of NaOH is 4.17.

To solve this problem, we calculate the initial concentration of acetic acid, CH₃COOH, and acetate, CH₃COO⁻;

CH₃COOH; 0.50 M

CH₃COO⁻; 0.22 M

Next, we determine which species will react with the NaOH. Since NaOH is a strong base, it will react completely with CH₃COOH to form CH₃COO⁻ and water;

NaOH + CH₃COOH → CH₃COO⁻ + H₂O

We use the balanced equation to determine the moles of NaOH required to react completely with CH₃COOH;

1 mole CH₃COOH reacts with 1 mole NaOH

0.05 moles NaOH will react with 0.05 moles CH₃COOH

Since we started with 0.50 M CH₃COOH, we can calculate the initial moles of CH₃COOH;

Molarity = moles / volume

0.50 M = moles / 1.00 L

moles CH₃COOH = 0.50 mol

After reacting with 0.05 moles NaOH, we have:

moles CH₃COOH = 0.50 mol - 0.05 mol = 0.45 mol

moles CH₃COO⁻ = 0.05 mol

Using Henderson-Hasselbalch equation;

pH = pKa + log([CH₃COO⁻]/[CH₃COOH])

pKa for acetic acid is 4.76.

[CH₃COO⁻]/[CH₃COOH] = 0.05 mol / 0.45 mol = 0.111

pH = 4.76 + log(0.111) = 4.17

Therefore, the pH of the solution is 4.17.

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An ionic equation is a chemical equation in which the electrolytes in aqueous solution are expressed as dissociated ions.

Given the molecular equation of the reaction of aqueous potassium sulfate, K2SO4, and aqueous strontium iodide, SrI2 as shown:

The total ionic equation is as shown below;

Next is to get the net ionic equation from the total ionic equation. Canceling out the common ions on both sides of the equation will give:

This gives the net ionic equation of the given molecular equation

Answer:

physical change......

Answer:

Chemical change

Explanation:

Explanation:

Opposite hemispheres have opposite seasons, no matter the earth's rotation, because of the earth's tilt. The earth's tilt is responsible for all seasons.

1. B, the energy associated with the motion of an object

2. C, 12.4 g/mL

3. C, 5

1) B) Kinetic energy is energy associated with the motion of an object.

2) B) Density equals mass divided by volume: 1.38 g/mL

3) C) There are 5 significant figures in 20.300

4) A) 80 is the atomic number for mercury on the periodic table.

5) E) The formula for copper (II) sulfate pentahydrate is CuSO4•5H2O

So in summary:

• Kinetic energy is the energy of a moving object due to its motion.

• Density is calculated by dividing an object's mass by its volume.

• Significant figures refer to the known precision of a measurement based on the digits reported.

• Atomic symbols represent elements on the periodic table.

• Chemical formulas use symbols of the elements to show the proportions of atoms in a compound.

Answer:

HCL is your the answer of which is the acid

The acid should be considered as the HCL namely hydrogen chloride (HCl).

It is used for neutralization the alkaline agents that acted as the bleaching agent in terms of food, textile, metal.

It should be neutralized at the time of realization into the soil. And, hydrolyzed when it should be exposed to water.

hence, the second option is correct.

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A silver precipitate is created when silver nitrate, AgNO3, and magnesium bromide, MgBr2, are combined in aqueous solutions.Create the net ionic equation as well as the balanced formula equation for this reaction.

The end products of the reaction between aqueous systems of magnesium chloride (MgCl2) and silver nitrate (AgNO3) are solid silver chloride and aqueous magnesium nitrate.

The right response is (CH3)3C-Cl.The most reliable 3° carbocation is formed by tert-butyl chloride, or (CH3)3C - Cl.As a result, it will immediately produce the white precipitate of AgCl in AgNO3 solution.

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