in the single-displacement reaction, what happened to the temperature and pressure immediately after adding the zinc to the hydrochloric acid solution?

Answer:

313.2 g of \({K_{2} }S O_{4}\)  must be added to 1.20 liters of water to produce a 1.50 molar solution.

Explanation:

What is molarity?

According to the given question,

Solution :

∴ Number of moles of solute, here, \({K_{2} }S O_{4}\)

= molarity x volume of the solution

= 1.20 x  1.50 = 1.8

∴ Mass of 1.8 moles of \({K_{2} }S O_{4}\) = 1.8 x molar mass of   \({K_{2} }S O_{4}\)  

Now the molar mass of \(K_{2} SO_{4}\)

= (Gram atomic mass of K x 2) + (Gram atomic mass of S) + (Gram atomic mass of O x 4)

= (39x2) + 32 + (16 x 4) g

= 174 g.

∴ Mass of 1.5 moles of \({K_{2} }S O_{4}\)

= 1.8 x molar mass of   \({K_{2} }S O_{4}\)  

= 1.8 x 174 g

= 313.2 g.

Thus, 313.2 g of \({K_{2} }S O_{4}\)  must be added to 1.20 liters of water to produce a 1.50 M solution.

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Answer:

The gas fumes are toxic

Explanation:

The extremely high concentrations of carbon monoxide produced by an engine can raise CO concentrations in a closed building so quickly that a person may collapse before they even realize there is a problem. Carbon monoxide reduces the amount of oxygen to the brain, causing CO intoxication, and lack of reasoning.

Alkynes react in two ways: addition to the triple bond and substitution through the acetylenic anion.


1. Addition reaction to the triple bond: Alkynes can undergo addition reactions where atoms or groups of atoms add to the triple bond, forming a single bond. For example, hydrogenation of alkynes with hydrogen gas (H2) and a metal catalyst can produce an alkane.

2. Substitution reaction through the acetylenic anion: Alkynes can also undergo substitution reactions, where a functional group replaces another atom or group of atoms in the molecule. In the case of alkynes, the acetylenic anion (-C≡C:^-) can be substituted with other groups. For example, the acetylenic anion can react with an alkyl halide to form an alkene.

Overall, alkynes exhibit both addition and substitution reactions, providing them with diverse reactivity compared to alkenes.

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Answer:

If you can identify the species that was being oxidized, its species that contains the element on the other side is the reducing agent.

For example, in the equation Zn + Cu2+ --> Zn2+ + Cu, the zinc was oxidized, making Zn the reducing agent.

Elements with the same number of valence electrons will have similar properties. which element has similar properties to the same group.

The electrons that are found in an atom's outermost shell are known as valence electrons. It assists us in figuring out an element's chemical makeup and how bonds are formed with other elements. We can use it to determine how easily bonds can form between atoms.

The quantity of electrons in an element's atom—which is in turn determined by the number of protons—determines the element's chemical characteristics.

Because they have the same valence shell electron configuration, the elements in the same group have comparable chemical characteristics.

The number of valence electrons in an element's atom is the factor that most closely affects its chemical characteristics.

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When we bring a magnet near the doorbell when it is not connected to the battery, we feel a pull, or an attractive force.

For this the hypothesis can be:

Hypothesis: If there is no permanent magnet in the doorbell, just metal like iron, then when we bring a paper clip to the doorbell, we will observe an attractive force between the paper clip and the doorbell due to the interaction between the magnet and the iron in the doorbell.

Hypothesis: If there is a permanent magnet in the doorbell, then when we bring a paper clip to the doorbell, we will observe a stronger attractive force between the paper clip and the doorbell due to the interaction between the magnet and the metal components (such as iron) in the doorbell.

Thus, these can be the Hypothesis for the given scenario.

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The property of barium-137 that makes its use in the diagnosis of digestive illness safe is its relatively short half-life of about 2.5 minutes.

The use of Barium-137 in the diagnosis of digestive illnesses is safe due to its relatively short half-life of about 2.5 minutes.

This means that it decays quickly, reducing the risk of long-term exposure to radiation. Barium itself is also relatively non-toxic, making it a safe option for ingestion.

The patient drinks Barium-137 in syrup, allowing it to coat the digestive system, and X-rays are taken to identify any abnormalities or blockages.

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Answer:

The difference between an innate behavior and a learned one is that innate behaviors are those an animal will engage in from birth without any intervention. Learned behavior is something an animal discovers through trial, error and observation.

Explanation:

Due to the greater resonance stabilization of the phenoxide ion through the presence of the electron-withdrawing nitro group, 4-nitrophenol is more acidic than 4-aminophenol.

To explain why 4-nitrophenol is more acidic than 4-aminophenol, we need to consider the resonating structures and their impact on the stability of the resulting ions.

Let's start with the structure of 4-nitrophenol:

 NO2

 |

OH - C6H4 - H

And the structure of 4-aminophenol:

 NH2

 |

OH - C6H4 - H

In 4-nitrophenol, the presence of the nitro group (-NO2) introduces strong electron-withdrawing effects. The nitro group is an electron-withdrawing group due to the presence of the highly electronegative nitrogen and oxygen atoms. This electron-withdrawing effect destabilizes the phenoxide ion (formed after deprotonation of the -OH group) by further delocalizing the negative charge through resonance.

The resonating structures of 4-nitrophenol can be represented as follows:

 NO2           NO2           NO2

 |             |             |

O - C6H4 - H <-> O = C6H4 - H <-> O - C6H4 - H

As a result of these resonating structures, the negative charge is delocalized over the oxygen atom and the aromatic ring, making the phenoxide ion more stable. This increased stability of the phenoxide ion in 4-nitrophenol enhances the ease of deprotonation and increases its acidity.

On the other hand, in 4-aminophenol, the amino group (-NH2) is not an electron-withdrawing group like the nitro group. It has a neutral or slightly electron-donating effect. The presence of the amino group does not contribute significantly to the resonance stabilization of the resulting phenoxide ion.

The resonating structures of 4-aminophenol can be represented as follows:

 NH2           NH2

 |             |

O - C6H4 - H <-> O - C6H4 - H

In this case, the negative charge is localized primarily on the oxygen atom. The absence of strong resonance effects from the amino group results in a less stable phenoxide ion compared to 4-nitrophenol.

Therefore, due to the greater resonance stabilization of the phenoxide ion through the presence of the electron-withdrawing nitro group, 4-nitrophenol is more acidic than 4-aminophenol.

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If the same antibiotic were used again, the resistant bacteria would survive and reproduce, leading to an infection that is unaffected by the antibiotic. Hence, the answer is option a

Bacteria are microorganisms that can be found inside and outside the body. While some bacteria are good, most of them cause diseases and infections.

Antibiotics are drugs solely used to kill or stop the spread of bacteria. When antibiotics are overused, a small population of bacteria can survive it and start to reproduce, leading to a population of resistant bacteria that don't respond to the antibiotic designed to kill them. This is called antibiotic resistance.

Antibiotic resistance can be avoided by taking antibiotics only when it is needed and only when prescribed by a doctor or pharmacist.

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Answer:

(SrSe) | SeSr - PubChem.

Explanation:

Answer:

The electronegativity from order of least to highest is:

Ne, Ca, Fe, F

Explanation:

Elements in the periodic table have been arranged based on their level of electronegativity (which is the ability of an atom to attract electrons).

According to Paulings scale of rating elements based on their electronegativity, the electronegativity value of Fe, Ca, Ne, and F are 1.83, 1, 0 and 3.98 respectively.

Hence, based on Pauling scale, the order of electronegativity from least to highest is:

Ne > Ca > Fe > F

Answer:

here u go! ................

Answer:

Hope this is ok :))

Explanation:

Answer:

152.12

Explanation:

hope it helps

Kong Mali po sorry

According to the research, the correct option is d. Fernando is currently going through Detoxification process in which his body is cleared of drugs.

This is the treatment aimed at restoring the body's physiological homeostasis after it has been disturbed by the consumption of psychotropic substances as drugs.

In this sense, this process is carried out under the supervision of specialists in the treatment of addictive behaviors.

Therefore, we can conclude that Detoxification is a process of eliminating drugs or substances harmful to health to achieve physiological stability in the body.

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A water molecule (H2O) is composed of two hydrogen atoms and one oxygen atom that are covalently bonded to each other.

In a covalent bond, atoms share electrons in order to achieve a more stable configuration.

In the case of water, each hydrogen atom shares one of its electrons with the oxygen atom, forming two covalent bonds. Meanwhile, the oxygen atom shares two of its electrons with the hydrogen atoms, forming two additional covalent bonds. In total, a water molecule has four shared pairs of electrons, with two pairs shared between the oxygen and each hydrogen atom.

These covalent bonds give water its unique properties, including its ability to form hydrogen bonds with other water molecules, which contribute to the cohesion, surface tension, and high boiling point of liquid water.

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Based on the calculations, the enthalpy of the overall chemical reaction is equal to: C. -14.3 kJ.

A chemical reaction can be defined as a chemical process that involves the continuous transformation (rearrangement) of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound while new bonds are formed.

A chemical equation can be defined as a group of chemical symbols that is typically used in chemistry to represent the chemical reaction between two (2) or more chemical elements.

Mathematically, an expression for enthalpy of the overall chemical reaction is given by:

ΔHrxn = (n × ΔH₃) + (-n × ΔH₁) + (n × ΔH₂)

Where:

n represents the number of moles.

Substituting the given points into the formula, we have;

ΔHrxn = (2 × ΔH₃) + (-1 × ΔH₁) + (1 × ΔH₂)

ΔHrxn = (2 × (-92.3)) + (-1 × (-74.6)) + (1 × (-95.7))

ΔHrxn = -184.6 + 74.6 + 95.7

ΔHrxn = -14.3 kJ.

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The Rolaids tablet contains approximately 672 mg of calcium carbonate. We can use the balanced chemical equation for the reaction between calcium carbonate and hydrochloric acid to determine the amount of calcium carbonate in the Rolaids tablet

Here is the balanced chemical equation:

CaCO₃ + 2 HCl → CaCl₂ + CO₂ + H₂O

From the balanced equation, we can see that one mole of calcium carbonate reacts with two moles of hydrochloric acid. Therefore, the number of moles of calcium carbonate in the tablet can be calculated as:

moles of CaCO₃ = 0.505 mol/L × 0.02670 L × (1 mol CaCO₃ / 2 mol HCl)

moles of CaCO₃ = 0.0067225 mol

Next, we can use the molar mass of calcium carbonate to convert moles to mass:

mass of CaCO₃ = 0.0067225 mol × 100.09 g/mol

mass of CaCO₃ = 0.672 g

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Answer:

150

Explanation:

300 divided by 2

Answer: 215.0%

Explanation:

The concentration of A decreases and then levels out. Option A

In many chemical reactions, a reactant is consumed as the reaction progresses, leading to a decrease in its concentration over time. The reactant molecules are transformed into products, and as the reaction proceeds, the concentration of the reactant gradually diminishes.

At equilibrium, the concentrations of both reactants and products remain relatively constant over time, although they can coexist.

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Graduated cylinders, as opposed to beakers, are used to measure liquid volumes. They range in size from about 5ml to 2000ml. These cylinders are extremely accurate, measuring liquids to within 1%.

With tolerances of less than 0.2%, volumetric flasks, burets, and pipets are the most accurate. To achieve these accuracies, the person using the device must employ proper technique, and measurements must be taken at the temperature for which the glassware was calibrated (usually 20 degrees C).
The general rule of thumb is that you can estimate one more digit past the measuring device's smallest division. The smallest graduation on a 10mL graduated cylinder, for example, is a tenth of a millilitre (0.1mL). That is, you can estimate to the hundredths place when reading the volume (0.01mL).

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A formula for the sensitivity dR/dM  represents the sensitivity of the body's reaction to the medication. It shows how the reaction changes with respect to the dose of the medication, M. The term M*C represents the contribution of the constant C to the sensitivity, while the term \((2M^2)/3\) represents the contribution of the dose M itself.

To find a formula for the sensitivity, dR/dM, let's differentiate the given function R(M) with respect to M.

Step 1: Start with the function \(R(M) = M^2(C/2 - M/3).\)

Step 2: Apply the power rule of differentiation to differentiate M^2. The power rule states that if

\(f(x) = x^n, then f'(x) = n*x^(n-1). \\\)

n this case, n = 2.

\(dR/dM = 2M^(2-1)*(C/2 - M/3).\)

Simplifying, we have:

\(dR/dM = 2M*(C/2 - M/3).\)

Step 3: Distribute the 2M to each term inside the parentheses:

\(dR/dM = M*C - (2M^2)/3.\)

This formula represents the sensitivity of the body's reaction to the medication, dR/dM. It shows how the reaction changes with respect to the dose of the medication, M. The term M*C represents the contribution of the constant C to the sensitivity, while the term \((2M^2)/3\) represents the contribution of the dose M itself.

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the formula for the sensitivity, or the rate of change of the reaction R with respect to the dose M, is

dR/dM = MC - M\(^2^/^3\)

We calculate the derivative of the reaction function R(M) with respect to M.

the reaction function: R(M) = M²(C/2 - M/3)

We will apply  the power rule and the constant multiple rule of differentiation,

dR/dM = d/dM [M²(C/2 - M/3)]

= 2M(C/2 - M/3) + M²(0 - (-1/3))

= 2M(C/2 - M/3) + M\(^2^/^3\)

dR/dM =\(MC - 2M^2^/^3 + M^2^/^3\)

= \(MC - M^2^/^3\)

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Answer:

You will get 5.0 g of hydrogen.

Explanation:

As with any stoichiometry problem, we start with the balanced equation.

Sn

l

+

2HF

→

SnF

2

+

H

2

Moles of H

2

=

2.5

mol Sn

×

1 mol H

2

1

mol Sn

=

2.5 mol H

2

Mass of H

2

=

2.5

mol H

2

×

2.016 g H

2

1

mol H

2

=

5.0 g H

2

The reaction that occurs in a nuclear power plant are nuclear fusion and nuclear fission.

This is referred to as the type of reaction which involves the atomic nuclei fusing to form a heavier nucleus and is usually accompanied with the release of energy.

Nuclear fission on the other hand , is referred to as the process which involves the splitting of a heavy nucleus into smaller units of nuclei with the release of energy. A good example is the fusion of hydrogen atoms in other to form a helium atom there y making it the correct choice.

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Answer: Fussion and fission

Explanation:

n=20 mol

(NH)4 SO4

Atomic masses :

N- 14

H- 1

S- 32

O- 16

Therefore M= 14×2 + 1×8 + 32 + 16×4

= 132

m= nM

= 20×132

= 2640g

Considering the Brönsted- Lowry Theory, the products formed in this Brønsted-Lowry reaction is:

According to the Brönsted- Lowry Theory, acids and bases can be defined as follows:

So, according to this theory, the reactions between acids and bases are H⁺ proton transfer reactions:

Acid + Base ↔ Conjugate Base + Conjugate Acid

where:

In this case, you have the balanced reaction:

HNO₂ + HSO₄⁻ → NO₂⁻ + H₂SO₄

So, considering  all previous, you have:

Finally, the products formed in this Brønsted-Lowry reaction is:

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Answer:

273 K, 101.3 kPa

Explanation: I just did the quiz

To acquires STP condition, Jim must apply a temperature 298 K and 1 atm pressure. At STP condition one mole of all gases occupies a volume of 22.4 liters.

The standard temperature and pressure is called STP condition. A temperature  of 298 K and pressure of 1 atm is called standard temperature and pressure.

At STP condition, the volume of one mole of any substance is 22.4 liters. One mole corresponds to 6.02 × 10²³ molecules. By satisfying the STP condition, we can determine the volume, and other mole parameters of a compound.

Experiments can be conducted at STP condition by applying a temperature of 298 K which is equal to 25°C and a pressure of  1 atm. He can use a thermometer and barometer to measure and set the values of temperature and pressure.

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Balanced equation

HCl + NaOH —> NaCl + H₂O

From the balanced equation above,

From the question given above, the following data were obtained:

CaVa / CbVb = nA / nB

(0.2 × Va) / (0.1 × 50) = 1

(0.2 × Va / 5  = 1

Cross multiply

0.2 × Va  = 5

Divide both side by 0.2

Va = 5 / 0.2

Va = 25 mL (Option C)

Balanced equation

H₂SO₄+ 2NaOH —> Na₂SO₄ + 2H₂O

From the balanced equation above,

From the question given above, the following data were obtained:

CaVa / CbVb = nA / nB

(1.5 × 15) / (Cb × 40) = 1 / 2

22.5 / (Cb × 40) = 1 / 2

Cross multiply

Cb × 40 =  22.5 × 2

Divide both side by 40

Cb = (22.5 × 2) / 40

Cb = 1.13 M (Option A)

Balanced equation

HNO₃ + KOH —> KNO₃ + H₂O

From the balanced equation above,

From the question given above, the following data were obtained:

CaVa / CbVb = nA / nB

(Ca × 10) / (4.2×10¯³ × 71.4) = 1

(Ca × 10) / 0.29988 = 1

Cross multiply

Ca × 10 = 0.29988

Divide both side by 10

Ca = 0.29988 / 10

Ca = 3×10¯² M (Option B)

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