True of False: When air is dense, its molecules are packed tightly together.

The three states of matter are solid - example is stone, liquid - example is water and gas - example is air.

A matter is referred to as a substance which has a certain mass and takes up a certain volume in space.

For example pen, pencil, toothbrush, water, milk are matters as well as car, bus, bicycle is also a matter. So matter is considered as a living thing and a non-living thing.

There are three states of matter and they include;

They have different properties, which can be explained by looking at the arrangement of their particles. This is the theoretical temperature at which particles have the least amount of energy and the slowest movement.

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When two or more reactants combine to produce a product, an addition reaction takes place without any of the atoms from the reactants being lost. Compounds with unsaturated C-C bonds, such as double (alkene) and triple (alkyne) bonds, frequently undergo addition reactions. Two new, stronger σ-bonds are formed out of the weaker π-bond.

A type of chemical reaction called an elimination reaction involves the removal of a number of atoms from a molecule, usually in pairs or groups. The elimination often occurs as a result of the action of metals, acids, and bases. The process of heating at high temperatures might also cause it.

The process of changing a substance into one of its isomeric forms, which have the same chemical makeup but a different structure or configuration and, consequently, often have distinct physical and chemical characteristics, is known as isomerization.

One nucleophile substitutes another in a family of organic reactions known as nucleophilic substitution reactions. It closely resembles the typical displacement reactions we observe in chemistry, in which a more reactive element displaces a less reactive element from its salt solution.

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This problem is describing a mixture composed by diethyl ether and actic acid, in which it is desired to extract the latter somehow.

In this case, it turns out relevant to recall the concept of polarity, hydrogen bonds, and, in general, intermolecular forces. Acetic acid is a highly polar compound, able to have both dipole and hydrogen-bonding interactions, which are by far stronger than nonpolar-based London dispersion forces.

In such a way, since diethyl ether and actic acid are able to interact via dipole-dipole interactions, they latter is able to be dissolved in the former; however, when it is desired to extract the acid, it would be necessary to add a substance able to form H-bonds with acetic acid, which are stronger than the dipole interactions.

Therefore, the best solvent for this extraction will be water due to its higher polarity and superior capacity to form H-bonds.

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The balanced symbol equation for the Haber process, which is the industrial method for producing ammonia, is N2 + 3H2 → 2NH3

A. The Haber process is the industrial method for producing ammonia, and the balanced equation for the reaction is:

N2 + 3H2 → 2NH3

The atom economy for a product is the percentage of the total mass of reactants that becomes the desired product. For ammonia, the atom economy can be calculated as follows:

Molar mass of NH3 = 14.01 + 3(1.01) = 17.04 g/mol

Atom economy of NH3 = (2 mol NH3 x 17.04 g/mol) / [(1 mol N2 x 28.02 g/mol) + (3 mol H2 x 2.02 g/mol)] x 100% = 34.0%

B. To calculate the theoretical yield of ammonia, we need to use the given mass of nitrogen and the stoichiometry of the balanced equation. The molar mass of nitrogen is 28.02 g/mol, so 27.3 g of nitrogen is equal to:

27.3 g / 28.02 g/mol = 0.974 mol N2

According to the balanced equation, 1 mole of N2 reacts with 3 moles of H2 to produce 2 moles of NH3. Therefore, the theoretical yield of ammonia is:

Theoretical yield of NH3 = (0.974 mol N2) x (2 mol NH3 / 1 mol N2) x (17.04 g/mol NH3) = 33.1 g NH3

C. The percentage yield of the reaction can be calculated by dividing the actual yield of ammonia by the theoretical yield, and then multiplying by 100%. The actual yield of ammonia is given as 29.9 g:

Percentage yield of NH3 = (29.9 g NH3 / 33.1 g NH3) x 100% = 90.4%

D. The percentage conversion of hydrogen can be calculated by dividing the mass of hydrogen used in the reaction by the mass of hydrogen that would have been used if all of it had been consumed in the reaction. The mass of hydrogen used is 10.4 g, and the mass of hydrogen that would have been used if all of it had been consumed in the reaction is:

1( mol H2 x 2.02 g/mol) x (0.974 mol N2 / 1 mol N2) = 1.98 g H2

Therefore, the percentage conversion of hydrogen is:

Percentage conversion of H2 = (10.4 g H2 / 1.98 g H2) x 100% = 525% (This result is not possible, as the percentage conversion cannot be greater than 100%. It is likely that there was an error in the calculation or in the data provided.)

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The theoretical yield of SnS₂ will be 4.20 gram can be produced using the following reaction

From the equation of the reaction:

The mole ratio of the reactant is 1:2.

Mole of 35.2 mL, 0.419 M SnBr₄  = 0.419 x 35.2/100 = 0.147 mols

Mole of 51.1 mL, 0.203 M Na₂S = 0.203 x 51.1/1000 = 0.0103 moles

Thus, Na₂S is in excess while SnBr4  is limiting.

Mole ratio of SnBr₄  and SnS₂ = 1:1

Equivalent mole of SnS₂ = 0.023 moles

Mass of 0.023 moles SnS₂ = 0.023 x 182.81 = 4.20 grams

The quantity of a product obtained from a reaction which is expressed in terms of the yield of the reaction. the quantity of product predicted by stoichiometry is called the theoretical yield, whereas the quantity obtained actually is called the actual yield.

A limiting reagent may be a chemical reactant that limits the amount of product that is formed. The limiting reagent gives the littlest yield of product calculated from the reagents (reactants) available. This smallest yield of product is named the theoretical yield.

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Answer:

Noble gases have very stable electron configuration and does not need to gain electrons, only when they gain energy. 1) For example, krypton is a chemical element with symbol Kr and atomic number 36, which means it has 36 protons and 36 electrons.

Answer: I think it’s B, The highest occupied s and p sub levels are completely filled.

Explanation:

Answer:

The process of photosynthesis occurs when green plants use the energy of light to convert carbon dioxide (CO2) and water (H2O) into carbohydrates. Light energy is absorbed by chlorophyll, a photosynthetic pigment of the plant, while air containing carbon dioxide and oxygen enters the plant through the leaf stomata.

Answer:

but purely citric acid synthetic Acid whose moller mass is equal to 192 g per mole. Okay, so here we have Modernity is even McGarity is equal to 0.5 M and we have volume, so Volume is equal to 200 mililiters  is equal to 0.1 liter  Okay, so they are asking to calculate the mass of what u have  Okay. So first of all, if we want to calculate the mass of then we have to calculate the number of moles. So maturity is equal to the number of moles per volume in liters . So you mean zero point sorry from this one number of moles is equal to So N is equal to m multiplied very weak. So that is equal to 0.1 and 0.5. So that is equal to 0.05 moles. Okay, now the mask is equal to the mass of cool eh is equal to the number of Okay. Number of 0.5 and it is multiplied by 92 g per mole. Then it is equal to 9.6 g. So this is the mass of a present. A 0.500 ml

The correct answer is D.

A strong base is a substance that completely dissociates into its ions in water, producing a high concentration of hydroxide ions (OH-). Similarly, a weak base is a substance that only partially dissociates into its ions in water, producing a low concentration of hydroxide ions (OH-).

The term that completes the analogy is "Weak electrolyte", which is a substance that only partially dissociates into its ions in water and conducts electricity poorly. A strong electrolyte, on the other hand, is a substance that completely dissociates into its ions in water and conducts electricity well.

Therefore, the analogy can be completed as follows:

"Strong base is to weak base as strong electrolyte is to weak electrolyte."

I hope it helped you :)

Answer:

15.5 km

Explanation:

1.55x10^4m

1.55x10000m

15500m

1km=1000m

b=15500m

1km*15500m=b*1000m

1km*15500m/1000m=b*1000m/1000m

b=15.5km

Hope this helps ;) ❤❤❤

To find the mass percent composition of an element, divide the mass contribution of the element by the total mass then multiply by 100.

The total mass = 200.0 g

Phosphorus mass = 87.28 g

Oxygen mass = 112.72 g

%composition of P:

=> (87.28 g/200.0g)*100

=> 43.64 %

%composition of O:

=> (112.72g/200.0 g)*100

=> 56.36 %

Heat energy is released into the environment as the rock's temperature rises as a result of conduction, creating an air bubble that is warmer than the surrounding air. This air bubble ascends into the upper atmosphere.

Heat transfer through conduction is not feasible since there is no medium separating the surface of the Earth from the Sun. The method of heat transfer that takes place without the aid of a medium is called radiation. So, we can say that radiation is how the heat from the Sun reaches the Earth.

Convection causes temperature disparities by forcing portions of a liquid or gas to heat up or cool down faster than their surrounds.

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Answer:

I believe it means two molecules of oxygen.

Explanation:

The name for the molecular oxygen model is o2 and when you place a number in front of the element, it tells how many molecules there are of that element.  In this case, there are two molecules.

I would like to apologise in advance if this was incorrect.    

Answer:

1-Temporarily store food.

2-Contract and relax to mix and break down food.

3-Produce enzymes and other specialized cells to digest food

The total capacitance of 0.0050 F connected in series is 5.0 × 10⁻⁶ F or 5.0 µF.

When capacitors are connected in series, their total capacitance is less than the smallest capacitance value. This is due to the fact that the effective distance between the capacitor plates increases as more capacitors are added. As a result, the total capacitance of 0.0050 F connected in series can be determined using the following formula:

1/Ceq = 1/C1 + 1/C2 + 1/C3 + ...

where C1, C2, C3, etc. are the capacitance values of the capacitors connected in series.

To compute the total capacitance, substitute the known values to the formula:

1/Ceq = 1/5.0 × 10⁻³ F

Here's how to solve for Ceq:

1/Ceq = 1/5.0 × 10⁻³ F1/Ceq = 200Ceq = 1/200Ceq = 5.0 × 10⁻⁶ F

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The direction of the polarity of a bond can be indicated using the symbols δ+ and δ-.

When two atoms with different electronegativities are bonded together, the electrons in the bond are not shared equally. The atom with higher electronegativity attracts the electrons more strongly, resulting in a partial negative charge (δ-) on that atom and a partial positive charge (δ+) on the other atom. These partial charges are represented by the symbols δ+ and δ-, respectively.

In the first step, the δ+ symbol is placed above the atom that has the partial positive charge, indicating the direction of the polarity. Similarly, the δ- symbol is placed above the atom with the partial negative charge, indicating the direction of the polarity.

The δ+ symbol represents the atom that is electron-deficient and has a higher electron density, while the δ- symbol represents the atom that is electron-rich and has a lower electron density. These symbols help in visualizing the polarity of the bond and understanding the distribution of charge within the molecule.

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The calculated molar mass would be too high if the standardized NaOH were exposed to the air for a long period of time after standardization.

If the standardized NaOH solution is exposed to air for a long period of time after standardization, the calculated molar mass would be too high. This is because NaOH is a hygroscopic compound, meaning it readily absorbs moisture from the air.

When NaOH absorbs moisture, it undergoes a reaction with carbon dioxide in the air, forming sodium carbonate (Na2CO3). This reaction is known as carbonation. The molar mass of sodium carbonate is higher than that of sodium hydroxide, which means that the calculated molar mass of NaOH would be artificially inflated.

During the standardization process, a primary standard such as potassium hydrogen phthalate (KHP) is used as a reference compound to determine the concentration of the NaOH solution. The balanced equation for the reaction between NaOH and KHP is:

NaOH + KHC8H4O4 → NaKC8H4O4 + H2O

If the NaOH solution is exposed to air and carbonation occurs, the equation would be:

2NaOH + CO2 → Na2CO3 + H2O

As a result, some of the NaOH reacts with carbon dioxide, leading to the formation of sodium carbonate. This reaction reduces the concentration of the NaOH solution, as some of the NaOH has converted into a different compound.

Since the standardized NaOH solution is used to calculate the molar mass of an unknown compound through titration, any decrease in the concentration of the NaOH solution would lead to an overestimation of the molar mass of the unknown compound.

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The PH is 2.66 of the titration solution after 2.19 ml of the naoh was added if the ka of acetic acid is 1.8 x 10-5.

What is acetic acid ?

It's a food preservative and additive . Acetic acid is widely used in the production of textile printing ink, dyes, photographic chemicals, insecticides, medicines, rubber, and plastics.

What is ph ?

The degree to which a material or solution is acidic or basic. The pH scale runs from 0 to 14. A pH value of 7 is neutral on this scale, meaning it is neither acidic nor basic. A pH number of less than 7 indicates that it is more acidic, whereas a pH value more than 7 indicates that it is more basic.

Moles of actic acid = 1.67 m x 25.9 ml

                                = 40.66 ml

Moles of Naoh = 0.154 x 2..19ml  

                                = 0. 3373 ml

Naoh + CH3 CooH ----> CH3 CooNa + H2o

Moles of CH3CooNa Formula = 0.3373 ml  

Moles of CH3 CooH remains  = 40.66 x 0.3373

                                                   = 40.32ml

Now from Henders on hasselbolch equation  

PH = Pka + log (conjucate box / acid )

= - log (1.8 x 10-5) = log ( 0.3373/40.32)

= 4.74-2.077

PH = 2.66

Therefore the PH is 2.66 of the titration solution after 2.19 ml of the naoh was added if the ka of acetic acid is 1.8 x 10-5.

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Answer:

true

Explanation:

Answer:

The determination of the nature of the combination of the two separate materials in the original material that looks pure is based on the characteristic of the change process they undergo to become two separate materials.

Therefore, they can know if they initially had a mixture or a compound by the following steps;

1) If the two separated materials can be easily remixed to form the original material, then they likely have a mixture of the two separate materials

2) If the process that results in the formation of the two separate materials, involves the absorption or evolves heat or other forms of energy, then the original substance was a compound

3) If the two newly formed materials is seen to be a permanent change, then the original material was a compound

Explanation:

Answer:

Correct Answer is no. 2.

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4. Bubbles formed.

Answer:

tty to fin out what happend by redoing it

Potassium (K) forms compounds KN, K₂O and KF with N, O and F element respectively.

Potassium nitride (KN) - Potassium (K) combines with nitrogen (N) to form potassium nitride (KN). The chemical formula for this compound is KN. Nitrides are compounds containing the nitrogen anion (N3-).

Potassium oxide (K2O) - Potassium (K) combines with oxygen (O) to form potassium oxide (K2O). The chemical formula for this compound is K2O. Oxides are compounds containing the oxygen anion (O2-).

Potassium fluoride (KF) - Potassium (K) combines with Fluorine (F) to form potassium fluoride (KF). The chemical formula for this compound is KF. Fluorides are compounds containing the Fluorine anion (F-).

Potassium is an alkali metal, and it forms ionic compounds with non-metals such as Nitrogen, Oxygen, Fluorine which are highly electronegative elements, these compounds are formed through the transfer of electrons from Potassium to Nitrogen, Oxygen, Fluorine which results in the formation of K+ and N3-,O2-,F- ions respectively.

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The  state of matter that can be condensed is the correct option is A) Solid.

The states of matter are as follows :

A. Solid

B. Gas

C. Liquid

D. Plasma

Out which the two are considered as the condensed state of the matter which are solid ad the liquid. The solid have the fixed volume and the fixed shape. The liquid have a fixed volume but do not have the fixed shape.

The condensed state of the matter is where the state in which atoms or the molecules are very close to each other. Therefore, the solid is state where the atoms or molecules are very close to each other.

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The number of moles of potassium hydroxide needed by Petunia would be 1.22 moles.

The number of moles present in a given mass of a substance is the ratio of the mass of the substance and the molar mass of the substance. This can be mathematically expressed as:

Mole = mass/molar mass

In this case, we want to know the mole equivalent of 68.39 grams of potassium hydroxide (KOH) that Petunia needs. First, we need to determine the molar mass of KOH from the molar weights of its component atoms.

Molar weight of K = 39

Molar weight of O = 16

Molar weight of H = 1

Molar mass of KOH = 39+16+1 = 56 g/mol

Number of moles present in 68.39 grams of KOH = 68.39/56 = 1.22 moles.

In other words, the number of moles of potassium hydroxide that Petunia needs is 1.22 moles.

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To can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature, assuming the amount of gas remains constant.

Mathematically, Boyle's Law can be expressed as P₁V₁ = P₂V₂, where P₁ and V₁ are the initial pressure and volume, and P₂ and V₂ are the final pressure and volume, respectively.

Given:

Initial volume, V₁ = 9.8 liters

Initial pressure, P₁ = 35 mmHg

Final volume, V₂ = 60 liters

Let's plug these values into the equation and solve for the final pressure, P₂:

P₁V₁ = P₂V₂

35 mmHg × 9.8 liters = P₂ × 60 liters

To find P₂, we can rearrange the equation:

P₂ = (35 mmHg × 9.8 liters) / 60 liters

P₂ = 5.7 mmHg

Therefore, when the volume is increased to 60 liters, the pressure of the gas will be approximately 5.7 mmHg.

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The pair of compounds that will not form a buffer solution is option d, NaF and HF.

To form a buffer solution, we need a weak acid and its conjugate base or a weak base and its conjugate acid. So, the pair of compounds that will not form a buffer solution is the one that does not have a weak acid and its conjugate base or a weak base and its conjugate acid.

a. NH3 and NH4Cl can form a buffer solution because NH3 is a weak base and NH4+ is its conjugate acid.

b. RBOH and HBr will not form a buffer solution because RBOH is a strong base and does not have a conjugate acid.

c. NaC2H3O2 and HC2H3O2 can form a buffer solution because HC2H3O2 is a weak acid and C2H3O2- is its conjugate base.

d. NaF and HF will not form a buffer solution because NaF is a salt of a strong base (NaOH) and a weak acid (HF). HF is a weak acid, but there is no conjugate base present.

e. H3PO4 and KH2PO4 can form a buffer solution because H2PO4- is a weak acid and HPO42- is its conjugate base.

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Answer:

A

Explanation: