What conditions must be specified when expressing the solubility of a substance.

A substance composed of two or more different elements participating in a chemical bond is a compound.

Compounds are formed when two or more elements chemically combine in fixed proportions, resulting in a new substance with unique properties. The elements within a compound are held together by various types of chemical bonds, such as covalent, ionic, or metallic bonds.

In a covalent bond, elements share electrons to attain a stable electron configuration. For example, water (H2O) is a compound formed by the covalent bonding of hydrogen and oxygen. In an ionic bond, one or more electrons are transferred from one element to another, creating ions with opposite charges that attract each other.

Compounds exhibit different properties than their constituent elements, which distinguishes them from mixtures, where elements or compounds are physically combined without chemical bonding.

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Explanation:

A. feels slippery

I hope it's helpful for you

Answer:

Option (a)

Explanation:

Bases react with acids. When an acid and a base react, they form water and a substance called salt. Bases turn red litmus blue. Bases can change the structure of a protein. This property of base is what makes bases feel slippery. Soap is a base that, when it gets wet, feels very slippery on your skin.

Answer:

1,3,5,6,7

Explanation:

the state of the object changes to from something new

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Answer:

40.0 mL. (4 marks)...

Explanation:

Answer: B. Winter

Explanation: The southern hemisphere is leaning towards the sun meaning that that hemisphere is closer to the sun therefore it is summer and spring. With the northern hemisphere and north america leaning away from the sun, it is farther away meaning it is winter.

Answer:

mixture

Explanation:

if u put sand in to a glass of water it is considered to be a mixture.

Science affected our lives at the beginning of this pandemic.

Explanation:

Although scientists did study the virus to see how deadly it is the pandemic kept spreading. The spreading of the virus was not the scientist's fault it was the citizens' fault. They now found a vaccine that took hard work and a short amount of time.

When a sample of 89.56 g  NH4NO3 dissolves in 42.05 g of water, the temperature changes from 28.69 c to 7.8 c, the heat flow (q) in this case is approximately -11,165 Joules.

To calculate the heat flow (q) in this case, we can use the equation:

q = m × C × ΔT

where:

q is the heat flow

m is the mass of the solution (water + NH4NO3)

C is the specific heat capacity of the solution

ΔT is the change in temperature of the solution

First, we need to find the mass of the solution by adding the mass of the water and the mass of NH4NO3:

Mass of solution = Mass of water + Mass of NH4NO3

= 42.05 g + 89.56 g

= 131.61 g

Next, we calculate the change in temperature:

ΔT = Final temperature - Initial temperature

= 7.8°C - 28.69°C

= -20.89°C

Now, we need to determine the specific heat capacity of the solution. Since the specific heat capacity of water is commonly used, we can assume it is approximately 4.18 J/g·°C.

Plugging the values into the equation, we can calculate the heat flow (q):

q = 131.61 g × 4.18 J/g·°C × (-20.89°C)

≈ -11,165 J

Therefore, the heat flow (q) in this case is approximately -11,165 Joules.

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Answer:

It would be the first one, an overall positive charge on one end and overall negative charge on the other end.

Explanation:

Answer:

It's A.) A molecule that has an overall positive change in one end and an overall negative charge on the other

Explanation:

The definition of a polar molecule is a molecule with a negatively charged end and a positively charged end.

Answer:

A.) 0.43 g

Explanation:

Before you can calculate the mass, you need to find the moles. You can do this by using Avogadro's Law:

V₁ / n₁ = V₂ / n₂

In this equation, "V₁" and "n₁" represent the first balloon's volume and mole value. "V₂" and "n₂" represent the second balloon's volume and mole value. Since you are searching for the first balloon's mole value, you can plug the other values into the equation and simplify to find n₁.

V₁ = 1.54 L                         V₂ = 0.72 L

n₁ = ? moles                      n₂ = 0.100 moles

V₁ / n₁ = V₂ / n₂                                               <----- Avogadro's Law

1.54 L / n₁ = 0.72 L / 0.100 moles                 <----- Insert values

1.54 L / n₁ = 7.2                                              <----- Simplify right side

1.54 L = 7.2 x n₁                                              <----- Multiply both sides by n₁

0.214 = n₁                                                       <----- Divide both sides by 7.2

Now, you can find the mass using the molar mass of the gas. Remember, hydrogen exists as a diatomic molecule.

Atomic Mass (H₂): 2(1.008 g/mol)

Molar Mass (H₂): 2.016 g/mol

0.214 moles He            2.016 g
--------------------------  x  -----------------  =  0.43 g H₂
                                       1 mole

73 grammes of hydrochloric acid and 24.3 grammes of magnesium compound will react.

To calculate the amount of magnesium substance that will react with hydrochloric acid weighing 73 g, we need to know the concentration of the hydrochloric acid and the stoichiometric ratio between magnesium and hydrochloric acid.

Assuming the hydrochloric acid is a standard 1 Molar solution and the stoichiometric ratio is 1:2 between magnesium and hydrochloric acid, the equation for the reaction is:
\(Mg + 2HCl - > MgCl_2 + H_2\)

To calculate the amount of magnesium substance needed, we first need to convert the weight of the hydrochloric acid to moles:
73 g \(HCl\) / (36.5 g/mol \(HCl\)) = 2 moles \(HCl\)

Since the stoichiometric ratio is 1:2 between magnesium and hydrochloric acid, we need half as many moles of magnesium:

2 moles \(HCl\) / 2 = 1 mole \(Mg\)
Finally, we can convert moles of magnesium to grams using its molar mass:

1 mole \(Mg\) * 24.3 g/mol \(Mg\) = 24.3 g \(Mg\)
Therefore, 24.3 grams of magnesium substance will react with 73 grams of hydrochloric acid.

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The pH of a 3.97x10^-2 m aqueous solution of hx if its ka is equal to 3.0x10^-3 is 1.96.

pH is defined as the concentration of hydrogen ion in the solution.

Given,

Ka = 3.0x10^-3

As we know that,

Ka =( [H+] [X-])/[HX]

Let the concentration of [H+] = [X-] = x at any time t.

At the same time, concentration of [HX] = (0.0397-x)

Ka = x^2/(0.0397-x)

3.0x10^-3 = x^2/(0.0397-x)

x^2 = 0.1191 × 10^-3

x = 1.09×10^(-2)

x = 0.0109

The concentration of [H+] = 0.0109.

As we know that,

pH = -log[H+]

pH = -log(0.0109)

pH = -(-1.96)

pH = 1.96

Thus, we calculated that the value of pH of a 3.97x10^-2 m aqueous solution of hx if its ka is equal to 3.0x10^-3 is 1.96.

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If the battery in the given figure is short-circuited by an ideal ammeter having zero resistance, it means that there is a direct connection between the positive and negative terminals of the battery.

As a result, the current flowing through the circuit will be very high, and the battery will discharge quickly. The value of delta V, which is the potential difference across the battery, is given as 6.5V. This means that the battery is capable of supplying a maximum of 6.5 volts of electrical energy to the circuit. However, due to the short circuit, the battery will not be able to maintain this potential difference for long, and its voltage will drop rapidly. Therefore, it is important to avoid short circuits in electrical circuits to prevent damage to the battery and other components.
In the given scenario, the battery with a potential difference (δv) of 6.5V is connected to an ideal ammeter with zero resistance. When the battery is short-circuited, it means that a low resistance path is created for the current to flow directly from one terminal to another. Since the ammeter has zero resistance, it will not affect the circuit. In this case, the current will flow through the ammeter, allowing it to accurately measure the current without impacting the potential difference (δv). Remember that ideal ammeters are a theoretical concept and may not be practically achievable.

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The product obtained when benzene is treated with HNO₃/H₂SO₄ followed by Zn, HCl, heat, followed by NaOH is phenol.

Treatment of benzene with HNO₃/H₂SO₄ (nitration):

In the presence of a mixture of concentrated nitric acid (HNO₃) and concentrated sulfuric acid (H₂SO₄), benzene undergoes nitration. The nitronium ion (NO₂+) is formed, which attacks the benzene ring, resulting in the substitution of a hydrogen atom with a nitro group (NO₂). The product formed in this step is nitrobenzene.

Reduction of nitrobenzene using Zn and HCl (reduction):

Nitrobenzene can be reduced to aniline using zinc (Zn) and hydrochloric acid (HCl). This reaction results in the removal of the nitro group (NO₂) and the addition of hydrogen (H) to the benzene ring. The product formed in this step is aniline.

Heating aniline with NaOH (alkaline fusion):

When aniline is heated with sodium hydroxide (NaOH), a process called alkaline fusion, the benzene ring undergoes a ring-opening reaction. This results in the formation of sodium phenoxide, which can be acidified to give the final product, phenol.

So, the product obtained after treating benzene with HNO₃/H₂SO₄ followed by Zn, HCl, heat, followed by NaOH is phenol.

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Answer:

12.5%.

Explanation:

The following data were obtained from the question:

Accepted value = 22.4 L

Experimental value = 19.6L

Percentage error =.?

Percentage error can be obtained by using the following formula:

Percentage error = |Experimental value – Actual value | / actual value × 100

Percentage error = |19.6 – 22.4|/22.4 × 100

Percentage error = 2.8 /22.4 × 100

Percentage error = 280/22.4

Percentage error = 12.5%

Therefore, the percentage error of Sarah is 12.5%

Answer:

Cl^- = 5.75

K^+ = 7.75

Explanation:

Now let us calculate the effective nuclear charge four K^+ and Cl^- from Slater's rule.

Given that Cl^- and K^+ has electronic configuration of; [Ne] 3s2 3p6 (they are isoelectronic species)

We compute S as follows;

For n - 2 level, S= 1

For n - 1 level, S= 0.85

For ns,np level S= 0.35

Note: S= screening or shielding constant

1s2, S=2 ×1 = 2

2s2 2p6, S= 8×0.85 = 6.8

3s2 3p6, S= 7 × 0.35 = 2.45

The electron under study is not considered hence seven out of eight electrons in the shell are considered

Hence

S= 2 + 6.8 + 2.45 = 11.25

Since Cl^- has 17 electrons;

Zeff(Cl^-) = 17 - 11.25 = 5.75

For K^+

Zeff = 19 - 11.25 = 7.75

Answer:

8.68 L is the new volume

Explanation:

You use Boyle's law for this.

\(P_{1}V_{1}=P_{2}V_{2}\)

\(P_{1}\) = first pressure

\(P_{2}\) = second pressure

\(V_{1}\) = first volume

\(V_{2}\) = second volume

Convert pressure from atm to mmHg (use same units):

5.97 x 760 = 4537.2 -> 4.54 x 10³

...maintain 3 significant figures in calculation, and round as needed...

(4.54 x 10³ mmHg)(2.79 L) = (1460 mmHg)(\(V_{2}\))

(4.54 x 10³ mmHg)(2.79 L) / (1460 mmHg) = \(V_{2}\) = 8.68 L

Hope this helps :)

Answer:

There are 5.69*10²⁴ molecules in 9.45 moles.

Explanation:

The mole is defined as the amount of matter that particles have, that is, atoms and elementary entities.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole and represents a quantity without an associated physical dimension. Avogadro's number applies to any substance.

Then the following rule of three can be applied: if 1 mole contains 6.023 * 10²³ molecules, 9.45 moles, how many molecules will it have?

\(amount of molecules=\frac{9.45 moles*6.023*10^{23}molecules }{1 mole}\)

Solving:

amount of molecules= 5.69*10²⁴⁴ molecules

There are 5.69*10²⁴ molecules in 9.45 moles.

Answer:

A. the iron atoms are gaining kinetic energy

Explanation:

when the iron melted and solidifies it loses potential energy and changes to kinetic energy

Answer:

Frequency is 2Hz

Explanation:

Answer:

17

Explanation:

mass number = # of protons + # of neutrons

Answer:

Mass and Volume

Explanation:

The formula for density is

\(\frac{Mass}{Volume}\)

The energy is being used to change the state of the ice rather than changing its temperature.

When ice melts, it undergoes a phase change from a solid to a liquid state. During this process, the temperature of the ice remains constant at the melting point of water.

This is because the energy being added to the ice is being used to break the intermolecular bonds between the water molecules in the ice rather than increasing the kinetic energy or temperature of the molecules.

The energy that is not being used to raise the temperature of the ice during the melting process is known as the latent heat of fusion. This energy is used to overcome the forces of attraction between the water molecules in the solid ice and break them apart.

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Crest

hope that helps^^

Answer:

Mean: 4.92

Median: 3

Mode: 2

Explanation:

(1+1+2+2+2+3+3+4+5+11+12+13)/12=4.92

Answer:

As this sheet of water moves on and off the beach, it can “capture” and transport beach sediment back out to sea. This process, known as “longshore drift,” can cause significant beach erosion.

There are 7 neutrons in an atom of nitrogen-14.

Nitrogen-14 is primarily an isotope of nitrogen, as is well known. We can also describe it as a neutral atom. Additionally, various isotopes typically have a variable ratio of neutrons to protons.

As is common knowledge, an atom's atomic number represents the total number of protons that make up its nucleus. We are informed that nitrogen has a mass number of 14, and we are also aware that nitrogen has an atomic number of 7.

It is discovered that the atomic number and the number of protons are same. This demonstrates that the nucleus of any atom that is an isotope of nitrogen will in general have seven protons.

Additionally, the number of electrons equals the amount of protons. The number of electrons will therefore be 7, we can say. We shall now determine how many neutrons are there. As is well known, mass is equal to the sum of the protons and neutrons. As a result, there will be = 14 - 7 = 7 neutrons.

As a result, we may say that nitrogen-14 has 7 electrons, 7 protons, and 7 neutrons and that it is neither an anion nor a cation. It's an impartial atom.

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Hamlet's portrayal shows that he believes himself to be unworthy of heroic action and full of self-deprecation. Ghost claims that by ingesting the waters of forgetfulness from the Underworld river.

Only Horatio and the readers discover the truth the about King's death in Hamlet, which creates dramatic irony. This kind of irony also emerges from his illusion of being angry. Others in the cast take him at his word when he lies to them.

When describing to Ophelia, Hamlet utilizes a simile to imply that it is both frigid and pure, or devoid of desire. Hamlet mocks Rosencrantz and Guildenstern by comparing playing a pipe to lying in this comparison (which they have been doing to him).

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The following statements concern molecules that require resonance. The correct answer is e. The benzene molecule is best described by the localized electron model.

In molecules that require resonance, the localized electron model is more appropriate for describing their bonding. Resonance occurs when there are multiple valid Lewis structures that can represent the electron distribution in a molecule. One such example is the benzene molecule (C6H6), which has alternating single and double bonds between carbon atoms. In the localized electron model, the pi bonding in molecules that require resonance is confined to regions between two adjacent atoms. This means that the pi electrons are localized within the individual bonds and do not freely move along the entire molecule.

On the other hand, the sigma bonding, which involves the overlap of atomic orbitals head-on, is not delocalized in molecules that require resonance. The sigma bonds remain localized between specific pairs of atoms. In the case of the benzene molecule, the localized electron model accurately describes the distribution of pi electrons along the ring structure. The delocalization of pi electrons is not present, and the pi bonds are confined to specific regions between adjacent carbon atoms. Therefore, statement e is correct, as the benzene molecule is best described by the localized electron model rather than the delocalized model used in molecular orbital (MO) theory.

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