calculate the mass of HNO3 obtained when 20.0g of KNO3 reacts completely with excess concentrated H2SO4

Answer:

because it could be harmful and dangerous for our health. like some substances can be acid so if we taste it we can die.

Explanation:

Answer:

Explanation:

There are several reasons why we should not taste unknown substances:

Health risks: The unknown substance may be toxic or harmful to our health, and tasting it can lead to serious health issues or even death.

Allergic reactions: We may be allergic to some substances, and tasting them can cause severe allergic reactions.

Unpleasant taste: The substance may have a terrible taste, and tasting it can cause discomfort or nausea.

Contamination: The unknown substance may be contaminated, and tasting it can lead to the spread of harmful bacteria or viruses.

Legal issues: Tasting unknown substances can be illegal in some cases, such as trying drugs or other illegal substances.

In conclusion, it is always advisable to avoid tasting unknown substances. If you come across something you are unsure about, it is best to seek professional help or advice rather than risking your health or safety.

1. The correct answer is basic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The barium cation has a +2 charge, so it will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, making the barium cation basic in nature.

2. The correct answer is acidic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The cyanide anion has a -1 charge, and will donate a single hydrogen ion to the water, forming the hydronium ion, H3O+, making the cyanide anion acidic in nature.

3. The correct answer is neutral. An aqueous solution of barium cyanide, Ba(CN)2, will be neutral. When the compound is dissolved in water, it will dissociate into barium cations and cyanide anions.

The barium cation will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, and the cyanide anion will donate one hydrogen ion to the water, forming the hydronium ion, H3O+. These two processes will cancel each other out, resulting in a neutral solution.

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Most of the reactions take place in solutions, it's critical to comprehend how the substance's concentration is expressed in a solution. Here the volume in mL of NaOH required to neutralize 334 mg of pure aspirin is 5 L.

The letter M stands for molarity, one of the most often used units of concentration. The number of moles of solute contained in 1 liter of solution is how it is defined.

Molarity is the ratio of the moles of a solvent to the total volume of the solution. The solution contains both the solute and the solvent.

Molarity = Number of moles / Volume of solution in L

1mg = 0.001 g

Here, 334 mg = 0.334 g

Molar mass of aspirin = 180.158 g/mol

Number of Moles = Mass / Molar mass = 0.334 / 180.158 = 0.0018

Volume  = Number of moles / Molarity = 0.0018 / 0.337 = 0.005 L

0.005 L = 5mL

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Option B is correct answer, when TΔS is 3 KJ the reaction is spontaneous reaction.

What is spontaneous reaction?

A spontaneous process in thermodynamics is one that happens without the system receiving any outside input. The time-evolution of a system in which it releases free energy and transitions to a lower, more thermodynamically stable energy state is a more technical definition (closer to thermodynamic equilibrium). Following the general convention for thermodynamic measurements, the sign convention for changes in free energy is as follows: a release of free energy from the system corresponds to a negative change in the system's free energy and a positive change in the surrounding free energy.

The reaction's spontaneity is determined by the Gibbs Free Energy (ΔG) value.

This value is calculated using the following equation, which depicts the link between temperature, entropy (ΔS), enthalpy (ΔH), and the Gibbs free energy (ΔG):

ΔG = ΔH - T(ΔS)

A positive ΔG value represents a non-spontaneous reaction,

A negative ΔG value  represents a spontaneous reaction.

Given ΔH = 2 KJ,

We get ΔG negative only when TΔS is 3 KJ.

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Answer:

Rate cup 1: 36.00 tsp/h.

Rate cup 2: 59.50 tsp/h.

Rate cup 3: 70.13 tsp/h.

Explanation:

Based on the given example, the units must be in tsp/hour. To do this we just have to divide tsp by seconds and then convert it to hours remembering that 1 hour equals 3600 seconds.

Let's calculate each case:

- Cup 1: 1 tsp, 1 minute 40 seconds. Remember that 1 minute equals 60 seconds, so 1 minute and 40 seconds equals 100 seconds. The calculation of the rate will look like this:

The rate of cup 1 is 36.00 tsp/h.

- Cup 2: 2 tsp, 2 minutes 1 second. As we saw before 1 minute equals 60 seconds, so 2 minutes equals 120 seconds. 2 minutes and 1 second equals 121 seconds. The rate of cup 2 will be calculated as:

The rate of cup 2 is 59.50 tsp/h.

- Cup 3: 3 tsp, 2 minutes 34 seconds. 2 minutes are the same that 120 seconds, so 2 minutes 34 seconds equals 154 seconds. The rate of cup 3 is calculated as follows:

The rate of cup 3 is 70.13 tsp/h.

Answer:

Sulfur

Explanation:

S+2e−→S2−

In order to obtain more accurate results as well as to improve the efficiency of the laboratory procedure, the following recommendations are given:

Improving laboratory results can be achieved through several strategies aimed at enhancing experimental conditions, equipment, procedures, and data analysis.

Some possible methods for improving laboratory performance:

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The mass of Ag₂O decomposed is  24.20 grams and the mass of Ag₂O required to form 388.00 mL of oxygen gas is 7.51 grams.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given:

Volume of O2 gas formed = 4.58 L

Pressure of O2 gas = 745 mmHg =0.979 atm

Temperature = 308 K

Using the ideal gas law: PV = nRT

n = (0.979 atm)(4.58 L) / (0.0821 L·atm/(mol·K))(308 K)

n = 0.209 mol

From the equation,  2 moles of Ag₂O produce 1 mole of O₂. Therefore, the moles of Ag₂O decomposed is equal to half the moles of O₂ formed:

Moles of Ag₂O = 0.209 mol / 2 = 0.1045 mol

Molar mass of Ag₂O = (2 × atomic mass of Ag) + atomic mass of O

= (2 × 107.87 g/mol) + 16.00 g/mol

= 231.74 g/mol

Mass of Ag₂O decomposed = Moles of Ag₂O × Molar mass of Ag₂O

= 0.1045 mol × 231.74 g/mol

= 24.20 g

Given:

Volume of O₂ gas formed = 388.00 mL

Pressure of O₂ gas = 734 mmHg = 0.964 atm

Temperature = 25 °C = 298 K

n = PV / RT

n = (0.964 atm)(0.388 L) / (0.0821 L·atm/(mol·K))(298 K)

n = 0.0162 mol

From the equation,  2 moles of Ag₂O produce 1 mole of O₂. Therefore, the moles of Ag₂O required is equal to twice the moles of O₂ formed:

Moles of Ag₂O = 2 × 0.0162 mol = 0.0324 mol

Molar mass of Ag₂O = 231.74 g/mol

Mass of Ag₂O required = Moles × Molar mass

= 0.0324 mol × 231.74 g/mol

= 7.51 g

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A segment of DNA is called a  gene.

A complex of nucleic acids and proteins that make up chromosomes is called  Chromatin

A structure in the nucleus of an eukaryotic cell that is made up of condensed DNA is called a  chromosome.

Answer:

1. Gene

2. Chromatin

3. chromosome

Explanation:

I hope this helps you :)

The slow, rate-determining step in the acid-catalyzed dehydration of 2-methyl-2-propanol is B. Loss of water from the oxonium ion to form a carbocation.

This step is the slowest and therefore determines the overall rate of the reaction. The other steps, including a. Protonation of the alcohol to form an oxonlum lon, c. Loss of a B-hydrogen from the carbocation to form an alkene, and d. The simultaneous loss of a f-hydrogen and water from the oxonium ion, occur more quickly and do not determine the overall rate of the reaction.

In the acid-catalyzed dehydration of 2-methyl-2-propanol, the first step is the protonation of the alcohol to form an oxonium ion. This is followed by the loss of water from the oxonium ion to form a carbocation, which is the slow, rate-determining step. The carbocation then undergoes a loss of a B-hydrogen to form an alkene, and finally, there is a simultaneous loss of a f-hydrogen and water from the oxonium ion.

Overall, the slow, rate-determining step in the acid-catalyzed dehydration of 2-methyl-2-propanol is the loss of water from the oxonium ion to form a carbocation.

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Answer:

B.)changes in dietary intake, lifestyle, and disease risk to match those of a new country,

Answer:

Significant Figures in 200.0

Result 200.0

Sig Figs 4 (200.0)

Decimals 1 (200.0)

Scientific Notation 2.000 × 102

E-Notation 2.000e+2

Answer:

120

Explanation:

Atomic weight of :

Mg=24

S=32

O=16

Molecular mass of MgSO4=24+32+(16*4)=120

The molarity of the sulfuric acid solution is 2.66 M. The molarity of the sulfuric acid solution can be calculated using the formula: Molarity (M) = moles of solute/volume of solution (in litres).

First, we need to convert the volume of the sulfuric acid solution from millilitres to litres. Since 1 litre is equal to 1000 millilitres, we have:

Volume of solution = 25.00 mL = 25.00 mL / 1000 mL/L = 0.02500 L

Next, we need to determine the moles of sodium hydroxide used in the titration. From the given information, we know that 0.0665 mol of NaOH was used.

Now, we can substitute the values into the formula:

Molarity (M) = 0.0665 mol / 0.02500 L = 2.66 M

To calculate the molarity of the sulfuric acid solution, we use the formula Molarity (M) = moles of solute/volume of solution (in litres). By converting the given volume from millilitres to litres, we find that the volume of the sulfuric acid solution is 0.02500 L. The number of moles of sodium hydroxide used in the titration is given as 0.0665 mol. Substituting these values into the formula, we calculate the molarity of the sulfuric acid solution as 2.66 M.

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6) The limiting reactant is benzene.

7) Ni is the limiting reactant.

For the first reaction:

a) To determine the limiting reactant, compare the number of moles of each reactant with their stoichiometric coefficients, benzene:

Molar mass of benzene (C₆H₆) = 78.11 g/mol

Number of moles of benzene = 45.0 g / 78.11 g/mol = 0.5765 mol

Calculate the number of moles of chlorine:

Molar mass of chlorine (Cl₂) = 70.91 g/mol

Number of moles of chlorine = 450 g / 70.91 g/mol = 6.344 mol

The stoichiometric coefficient of benzene is 1 and the stoichiometric coefficient of chlorine is also 1. Therefore, the limiting reactant is benzene, as it produces fewer moles of product than the amount of chlorine available.

b) To calculate the mass of excess reactant, find out how much of the excess reactant is left after the reaction, determine the amount of chlorine that reacts:

From the balanced chemical equation, 1 mole of benzene reacts with 1 mole of chlorine to produce 1 mole of chlorobenzene and 1 mole of hydrogen chloride.

0.5765 mol of benzene reacts with 0.5765 mol of chlorine, according to the equation. Therefore, the amount of excess chlorine is:

6.344 mol - 0.5765 mol = 5.7675 mol

The mass of excess chlorine is:

5.7675 mol x 70.91 g/mol = 409.1 g

c) The molar mass of chlorobenzene (C₆H₅Cl) is 112.56 g/mol. Since 1 mole of benzene produces 1 mole of chlorobenzene, the number of moles of chlorobenzene produced is equal to the number of moles of benzene reacted:

0.5765 mol of chlorobenzene is produced.

The mass of chlorobenzene produced is:

0.5765 mol x 112.56 g/mol = 64.85 g

7. For the second reaction:

a. To determine the limiting reactant, we need to compare the number of moles of each reactant to the stoichiometric coefficients in the balanced chemical equation. The balanced equation is:

Ni + 2HCl → NiCl₂ + H₂

The molar masses of Ni and HCl are 58.69 g/mol and 36.46 g/mol, respectively. Using these values, calculate the number of moles of each reactant:

Number of moles of Ni = 5.00 g / 58.69 g/mol = 0.085 mol

Number of moles of HCl = 2.50 g / 36.46 g/mol = 0.069 mol

Since the stoichiometric coefficient of Ni is 1 and the stoichiometric coefficient of HCl is 2, Ni is the limiting reactant.

b. To calculate the amount of excess reactant, first determine the theoretical amount of HCl needed to react completely with the amount of Ni present. From the balanced equation, 1 mole of Ni reacts with 2 moles of HCl. Therefore, the theoretical amount of HCl needed is:

Theoretical amount of HCl = 0.085 mol Ni × (2 mol HCl/1 mol Ni) = 0.17 mol HCl

The actual amount of HCl present is 0.069 mol, so the amount of excess HCl is:

Excess HCl = 0.17 mol - 0.069 mol = 0.101 mol

Convert this amount to grams using the molar mass of HCl:

Excess HCl mass = 0.101 mol × 36.46 g/mol = 3.69 g HCl

Therefore, 3.69 g of HCl will remain unreacted.

c. From the balanced equation, we can see that 1 mole of Ni produces 1 mole of NiCl₂. Therefore, the amount of NiCl₂ produced is equal to the amount of Ni reacted, which is 0.085 mol. Convert this amount to grams using the molar mass of NiCl₂:

Mass of NiCl₂ produced = 0.085 mol × 129.60 g/mol = 11.02 g NiCl₂

Therefore, 11.02 g of NiCl₂ will be produced.

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According to the rule of conservation of mass, no atoms are created or destroyed during a chemical process. Instead, the atoms combine in a variety of ways to create goods.

According to the law of conservation of mass or principle of mass conservation, any system that is closed to all transfers of matter and energy must maintain a constant mass over time since the system's mass cannot vary and neither more nor less amount can be added or subtracted.

The law of conservation of mass, no atoms are created or destroyed during a chemical process. Instead, the atoms combine in a variety of ways to create goods. This is why each element has the same amount of atoms on both sides of an equation with balanced symbols.

Thus, According to the law of conservation of mass, mass is neither generated nor destroyed during a chemical process.

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Answer:

I think it would be 0 since cations and anions must always combine in such a way so that their charges cancel.

Answer:

0.578 mol H₂SO₄

Explanation:\(\frac{3.48 * 10^{23}H2SO4}{1}\) ×\(\frac{1 mol H2SO4}{6.02214*10^{23}molecules H2SO4}\) =0.5778 mol H₂SO₄ = 0.578mol H₂SO₄

If we increase the temperature then the more no of electrons get the energy to jump from conduction band to valence band , thereby increase the conduction of the semiconductor .

Semiconductors :

In the semiconductor the energy gap between the valence band and the conduction band is small . this small energy gap allows some electrons to move from the valence band to the conduction band . thus the semiconductor conduct electricity and conductivity increases with increase in temperature .

There are two type of semiconductor : intrinsic semiconductor and extrinsic semiconductor .

Pure semiconducting substances are called intrinsic semiconductor .

The semiconductor obtained by doping are called extrinsic semiconductors.

Extrinsic semiconductor are of two types : n-type semiconductor and     p-type semiconductor .

n-type semiconductor is due to metal excess defect and p-type semiconductor is due to metal deficiency defect .

Semiconductors are used in transistors , photo-electric devices and rectifiers .

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Answer:

1 has the highest density because it has the most amount of circles in the least amount of space- it is the most densely filled with circles; it is the most dense.

Answer:

image 1 would have the highest density

Explanation:

the closer the molecules are the more solid an object is. if the molecules are far apart and rarely bump into eachother, it is more gaseous. the object in the middle (2) is a liquid

Answer:

-2820 kJ

Explanation:

Just got it right on Ap3x :)

Check your question and verify that it says "multiply" and not "reverse", this is the only page that has the answer for that one.

If you have "reverse" there is another guy who asked the question, is easy to find.

Considering the definition of extensive properties and heat of reaction, the enthalpy of reaction for the intermediate reaction is -2820 kJ (option C.).

Extensive properties of matter are defined as those that depend on the amount of material in a body.

The greater the mass or the larger the body or system, the greater the proportion of that property. This means that extensive properties are not fixed, they vary according to the amount of matter.

Also, extensive properties are additive, meaning they can be added together.

The heat of reaction is the energy that is released or absorbed when chemicals are changed in a chemical reaction.

Enthalpy is an extensive property: its magnitude depends on the amount of matter present.

Since enthalpy is an extensive property, if you need to multiply the following reaction by 2 to be an intermediate reaction in a Hess's law problem, the variation of enthalpy also is pultiplied by 2.

Then, ΔH= 2×( -1410 kJ)

ΔH= -2820 kJ

Finally, the enthalpy of reaction for the intermediate reaction is -2820 kJ (option C.).

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Answer:

Option A:

Zn(s) + Cu^(2+) (aq) → Cu(s) + Zn^(2+)(aq)

Explanation:

The half reactions given are:

Zn(s) → Zn^(2+)(aq) + 2e^(-)

Cu^(2+) (aq) + 2e^(-) → Cu(s)

From the given half reactions, we can see that in the first one, Zn undergoes oxidation to produce Zn^(2+).

While in the second half reaction, Cu^(2+) is reduced to Cu.

Thus, for the overall reaction, we will add both half reactions to get;

Zn(s) + Cu^(2+) (aq) + 2e^(-) → Cu(s) + Zn^(2+)(aq) + 2e^(-)

2e^(-) will cancel out to give us;

Zn(s) + Cu^(2+) (aq) → Cu(s) + Zn^(2+)(aq)

Answer:

I think what goes in the blank is (sources)

Explanation:

sounds are produced by sources which vibrate.

Answer:

Explanation:

Answer:

uhm I think it would be letter C. 0.589

The characteristics of the reactivity of the periodic table allows to find the correct answers to the different questions are:

1) Metals on the right have more protons, causing valence electrons to be held more strongly.

2) They are very nonreactive.

3) Na and Br

4) Rb loses an electron

1) The reactivity of a chemical element is the tendency to combine with others, this increases as it has fewer electrons in its last layer and since they are more weakly bonded.

Consequently, halogens have seven electrons in their last shell tends to attract an electron to remain with the full level and the alkaline that an electron has in the last shell tends to lose the electron to remain with a complete shell.

If we examine the periodic table the number of electrons in the last shell decreases from right to left.

Let's review the different claims:

a) False. The elements on the right side have a higher atomic number, therefore more protons.

b) True. The elements have more protons therefore it has to attract other electrons and the reactivity decreases.

c) False. As it has more electrons, it has more energy levels, losing all the electrooens is more difficult, so the reactivity decreases.

d) False. By having more electrons it has more energy levels.

2) What is the unique characteristic of the elements of group 18

The elements of group 18 are the noble gases, they have their last full layer therefore they do not have.

the correct answer is:  They are very nonreactive.

3) The reactivity in the period table decreases with increasing period therefore the element of period 3 is the most reactive in this case Sodium and Halogen of group 5 is the most reactive in this case Bromine.

the compound Na and Br is the most reactive of all.

4) Rubidium has 1 electron in its last shell, both in a chemical reaction pole loses the electron.

the correct answer is: Rb loses an electron

In conclusion, using the characteristics of the reactivity of the periodic table, we can answer the different questions..

      1) Metals on the right have more protons, causing valence electrons to be held more strongly.

      2) They are very nonreactive.

      3) Na and Br

      4) Rb loses an electron

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The whole Patterns of Reactivity Quick Check for Honors Chemistry is

1) B. Metals on the right have more protons, causing valence electrons to be held more strongly.

2) B. by gaining electrons

3) B. They are very nonreactive

4) A. Cs and Br

5) A. Rb loses an electron

remaining reactant after 120 seconds if the half-life is 60 seconds for a first-order reaction = 25% of [A]₀

half life = 60 seconds

120 seconds = 2 half lives

Amount left = \(\frac{1}{2^n} } [A]_0\\\)

n = 2

Amount left = \(\frac{1}{2^{2} }[A]_{0}\)

= \(\frac{[A]_{0} }{4}\)

Amount left = 25% of [A]₀

The half-life of a reaction is the time expected for a reactant to arrive at one-a portion of its underlying fixation or strain. For a first-request response, the half-life is free of focus and steady after some time.

For a zero order reaction (Half life decreases with decreasing concentration.) For a 1st order reaction (Half life is constant.) For a second order reaction (Half life increases with decreasing concentration.)

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If you shake ethanol and oil in a test tube and then add water, you would likely see the water and ethanol mix together, while the oil remains separate.

This is because ethanol and water are miscible, meaning that they can mix together in any proportion to form a homogenous solution. Oil, on the other hand, is immiscible with water, meaning that it does not dissolve in water and will instead form a separate layer on top of the water.

When ethanol and water are mixed together, the ethanol molecules become surrounded by water molecules, and the mixture becomes homogenous.

This is because the ethanol molecules are polar, meaning that they have a positive end and a negative end, and the water molecules are also polar, with a positive end and a negative end. The positive end of the ethanol molecule is attracted to the negative end of the water molecule and vice versa, so the two substances can mix together easily.

Oil, on the other hand, is nonpolar, meaning that it does not have positive and negative ends. As a result, it does not interact with water molecule

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