If a reaction involves gases and the pressure is decreased, how will the equilibrium change?

A. Towards the side with the fewest molecules.
B. It will not be affected.
C. Towards the products.
D. Towards the side with the most molecules.

Boils at -40 C (or F, same same) so colder than that it would be a clear stable liquid.

Answer:

At or below -42°C

Explanation:

Hello,

As propane is gaseous at the standard sea level wherein the atmospheric pressure is 1 atm and the environmental temperature roughly 25°C, in order to condense it, say convert it from gas to liquid, one must cool it down at least until its boiling temperature which is -42°C. In such manner, to remain as a liquid, it must be cooled down at or below 42°C.

Best regards.

The net ionic equation for the given reaction simplifies the total ionic equation by removing spectator ions, focusing on the ions directly participating in the reaction.

Net Ionic Equation:

3 Ba²+ (aq) + 2 PO₄³¯ (aq) → Ba₃(PO₄)₂ (s)

For the given total ionic equation, spectator ions are removed to obtain the net ionic equation. In this case, the net ionic equation highlights the essential ions involved in the reaction.

Answer:

23.33 g

Explanation:

molar mass is the mass of 1 mol of atom/compound

molar mass of a compound can be calculated by taking the sum of the products of the molar mass of each element by the number of molecules of that element in the compound

molar mass of NH₄Cl

molar mass of N - 14 g/mol

molar mass of H - 1 g/mol

molar mass of Cl - 35.5 g/mol

molar mass of NH₄Cl  - (14 g/mol x 1) + (1 g/mol x 4) + (35.5 g/mol x 1) = 53.5 g/mol

therefore mass of 1 mol of NH₄Cl  - 53.5 g

mass of 0.436 mol = 53.5 g/mol x 0.436 mol = 23.33 g

mass of NH₄Cl is 23.33 g                  

Answer:

0.436 moles of ammonium chloride (NH4Cl) has a mass of 23.3 grams

Explanation:

Step 1: Data given

Number of moles of NH4Cl = 0.436 moles

Molar mass of NH4Cl = 53.49 g/mol

Step 2: Calculate mass of ammonium chloride

Mass = moles * molar mass

Mass NH4Cl = moles NH4Cl * molar mass NH4Cl

Mass NH4Cl = 0.436 moles * 53.49 g/mol

Mass NH4Cl = 23.3 grams

0.436 moles of ammonium chloride (NH4Cl) has a mass of 23.3 grams

Answer:

C. Compound

Explanation:

NaCl is a combination of two elements. This is specifically an ionic compound.

Sodium chloride is a compound.

A chemical compound exists as a chemical substance comprised of many identical molecules composed of atoms from more than one component held together by chemical bonds. Compounds exist as chemical substances made up of two or more elements that exist chemically bound together in a fixed ratio. All the subject in the universe is composed of atoms of more than 100 various chemical elements, which exist found both in pure form and incorporated into chemical compounds. Chemical compounds exist formed by elements that bond together. These bonds stand generally covalent, ionic, or metallic bonds.

The correct solution is option C.

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Questions:

1) Kinetic energy is the energy an object has due to its ________.

2) Kinetic energy can be calculated from what two measurements?

3) What is the standard unit of measurement for kinetic energy?

4) What would happen to the kinetic energy of an object if you doubled the mass?

--------------------------------------------------------------------------------------------------------------

Answers:

1) Motion

2) Velocity and mass

3) Joule

4) The kinetic energy would double

Answer:

Question 1.  → The amount remained is 15.625 g after 5 half-lives (30 hours).

Question 2. →  mass % of water =41.4 %

Question 3. →  C. 64 grams.

Explanation:

Question 1.

It is known that the decay of isotopes and radioactive material obeys first order kinetics.

Also, it is clear that in first order decay the half-life time is independent of the initial concentration.

Thus, 30 hours represent (30/6) 5 half-lives.

500 g →(first 1/2 life) 250 g →(second 1/2 life) 125 g →(third 1/2 life) 62.5 g →(fourth 1/2 life) 31.25 g →(fifth 1/2 life) 15.625 g

So, The amount remained is 15.625 g after 5 half-lives (30 hours).

Question 2.

mass % of water = (mass of 4 mol of H₂O) / (mass of 1 mol of CuF₂.4H₂O ) *100 = (72 /174) *100 = 41.4 %

Question 3.

Mass percentage is defined as the mass of a solute divided by the total mass of the solution, multiplied by 100

∴ 16 = ( mass of solute / 400 g) *100

mass of solute = (16* 400)/ 100 = 64 g.

So the right choice is C. 64 grams.

Answer:

0.737 L

Explanation:

Charles law states for a fixed amount of gas, volume of the gas is directly proportional to the absolute temperature of the gas at constant pressure

we can use the following equation

V1/T1 = V2/T2

where V1 is volume and T1 is temperature at first instance

V2 is volume and T2 is temperature at the second instance

substituting the values

3.50 L / 727.0 K = V2 / 153.0 K

V2 = 0.737 L

new volume at 153.0 K is 0.737 L

Final answer:

Using Charles's Law, which states the direct relationship between the volume and temperature of a gas with constant pressure, we can calculate that 3.50 liters of gas at 727.0 K will occupy approximately 0.7366 liters at 153.0 K.

Explanation:

The question asks to determine the volume a gas will occupy at a different temperature, holding pressure and the amount of gas constant. This is a direct application of Charles's Law, which states that the volume of a gas is directly proportional to its temperature when pressure is held constant. To solve this, we can use the formula:

V1/T1 = V2/T2

Where V1 is the initial volume, T1 is the initial temperature, V2 is the final volume, and T2 is the final temperature. Plugging in the values we have:

V1 = 3.50 L

T1 = 727.0 K

T2 = 153.0 K

V2 = ?

First, let's isolate V2:

V2 = V1 * (T2/T1)

Now, substituting the given values:

V2 = 3.50 L * (153.0 K / 727.0 K)

Performing the calculation:

V2 = 3.50 L * 0.21045126...

V2 ≈ 0.7366 L

The gas originally at 727.0 K will occupy approximately 0.7366 liters at 153.0 K.

If a neutral atom becomes negatively charged, it has undergone reduction.

Reduction is the process through which a neutral atom gain an electron (thus reducing its oxidation number) and turns into a negative ion (also known as : anion)

So basically none of the above

If a neutral atom becomes negatively charged, it has undergone reduction. Hence, option C is correct.

An atom contains a central nucleus surrounded by one or more electrons.

Protons are bound in the nucleus and can be neither gained nor lost. So any change in the charge of an atom is due to changes in its electron count. If a neutral atom gains electrons, then it will become negatively charged. If a neutral atom loses electrons, then it becomes positively charged.

The loss of electrons is the corresponding increase in the oxidation state of a given reactant is called oxidation. The gain of electrons and the decrease in the oxidation state of a reactant is called reduction.

Reduction is the process through which a neutral atom gains an electron (thus reducing its oxidation number) and turns into a negative ion (also known as an anion).

Hence, option C is correct.

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Answer:

27.06 mL.

Explanation:

Molarity is the no. of moles of solute dissolved in a 1.0 L of the solution.

M = (no. of moles of acrylic acid)/(V of the solution (L))

M = (mass/molar mass)acrylic acid / (V of the solution (L))

mass of acrylic acid = 0.0975 g, molar mass of acrylic acid = 72.06 g/mol, V of the solution = 250 mL = 0.25 L.

∴ M = (0.0975 g/72.06 g/mol)/(0.25 L) = 0.0054 M.

The no. of millimoles of acid is equal to that of the base at the neutralization.

∴ (XMV) NaOH = (XMV) acrylic acid.

X is the no. of reproducible H⁺ (for acid) or OH⁻ (for base),

M is the molarity.

V is the volume.

X = 1, M = 0.05 M, V = ??? mL.

X = 1, M = 0.0054 M, V = 250.0 mL.

∴ V of NaOH = (XMV) acrylic acid/(XM) NaOH = (1)(0.0054 M)(250.0 mL)/(1)(0.05 M) = 27.06 mL.

To solve the problem, we first calculate the moles of acrylic acid, which is 0.001352 mol. Since it reacts with NaOH in a 1:1 ratio, the same amount of moles is needed for NaOH. Therefore, to find the volume of NaOH solution, we divide the moles of NaOH by its molarity, giving us the result of 27.04 mL.

The question given is a standard acid-base titration problem in chemistry. We first need to determine the number of moles of acrylic acid present. The molar mass of acrylic acid (HCH2CHCO2) is approximately 72.06 g/mol. The moles of acrylic acid is given by mass divided by molar mass, so 0.0975g / 72.06g per mol = 0.001352 mol.

Now, since acrylic acid is a monoprotic acid and will react with NaOH in a 1:1 ratio, the moles of NaOH required to reach the equivalence point in titration is also 0.001352 mol.

The volume of NaOH solution can be found using the formula M = mol/L, rearranging to solve for volume gives L = mol/M. So, 0.001352 mol / 0.0500 mol per L = 0.02704 L or 27.04 mL of NaOH solution. Therefore, the student will need approximately 27.04 mL of the NaOH solution to reach the equivalence point in the titration.

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Boiling point is the only answer that doesn’t have to do with their physical property

Answer:

D) ability to combine with oxygen

Explanation:

D because oxygen is not visible so that is not a physical property

The segments A-B, C-D, and E -F in the graph represents the changes in potential energy of the molecules in the substance.

The potential energy of a substance is the energy generated by virtue of its position at a height from the surface. The energy generated by virtue of the motion of the substance is called the kinetic energy.

The average kinetic energy of the substance is called its  thermal energy. Hence, as the temperature of the substance increases, kinetic energy increases, potential energy decreases.

In the given graph, the segments, that indicates an increase in temperature indicates a decrease in potential energy. Hence, the segments A-B, C-D, and E -F in the graph represents the changes in potential energy of the molecules in the substance.

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The segments A-B, C-D, and E -F in the graph represents the changes in potential energy of the molecules in the substance.

The potential energy of a substance is the energy generated by virtue of its position at a height from the surface. The energy generated by virtue of the motion of the substance is called the kinetic energy.

The average kinetic energy of the substance is called its  thermal energy. Hence, as the temperature of the substance increases, kinetic energy increases, potential energy decreases.

In the given graph, the segments, that indicates an increase in temperature indicates a decrease in potential energy. Hence, the segments A-B, C-D, and E -F in the graph represents the changes in potential energy of the molecules in the substance.

Answer:Sample Absorbance (625 nm)  

A 0.536  

B 0.783  

C 0.045  

Therefore, I will use these data to solve your question. If you have other absorbances values, just follow my steps and plug in different numbers.

First, we see 1 mole of NH3 gives 1 mole product.

In B moles of NH3 = moles of NH3 in A + (5.5 x10^-4 x2.5/1000) = 1.375 x10^6 + mA

( mA = moles of NH3 in A) vol of B = 25 = vol of A

now A = el C = eC ( since l = 1cm)

Because, n net absorbance due to complex blank absorbance must be removed.

Here A(A) = 0.536 - 0.045 = 0.491 , A(B) = 0.783 - 0.045 = 0.738  

(you can plug in different numbers in this step)

A2/A1 = C2/C1 , A(B)/A(A) = (1.375x10^-6 +mA)/(mA) = 0.738/0.491

So, mA = 2.733 x 10^-6 = moles of NH3 in A (Lake water)

Hence [NH3] water ( 2.733 x10^-6 ) x 1000/25 = 1.093 x 10^-4 M

Lake water vol = 10 ml out of 25,

Concentration of ammonia in lake water = 2.733 x10^-6 x 1000/10 = 2.733 x 10^-4 M

Then, A = 0.491 = e x 1 x 1.093 x10^-4

e = 4492 M-1cm-1

Explanation:

The molar absorptivity (ε) of the indophenol product, as calculated using the Beer-Lambert law and the known concentration and measured absorbance of Sample B, is 12109.09 M^-1 cm^-1. To find the concentration of ammonia in the lake water, we subtract the absorbance of the reagent blank from the absorbance of Sample A, then use the Beer-Lambert law to solve for the concentration. It results in 0.000031 M, or 3.1x10^-5 M.

To find the molar absorptivity (ε), we can use the Beer-Lambert law, which states that the absorbance (A) of a solution is directly proportional to its concentration (c) and the path length (l) through which the light passes. The formula is A = εlc. In this case, the path length is a constant 1.00 cm, so we can rearrange the formula to solve for ε: ε = A / (l * c).

Sample B contains a known amount of NH3. From this, we know that the concentration of NH3 in the solution is (2.50 mL * 5.50x10^-4 M) / 25 mL = 0.000055 M. Using the measured absorbance for sample B (0.666), we can solve for ε: ε = 0.666 / (1.00 cm * 0.000055 M) = 12109.09 M^-1 cm^-1.

To find the concentration of ammonia in the lake water, we subtract the absorbance of the reagent blank (C) from the absorbance of sample A, which contains an unknown amount of NH3. This gives us the absorbance due to the NH3 in the lake water: A' = 0.419 - 0.045 = 0.374. We can then use the Beer-Lambert law to solve for the concentration of NH3: [NH3] = A' / (ε * l) = 0.374 / (12109.09 M^-1 cm^-1 * 1.00 cm) = 0.000031 M, or 3.1x10^-5 M.

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5. Eubacteria

6. Plantae

7. Animalia

8. Protist (technically not a kingdom)

9. Archaebacteria

10. Fungi

Answer:

2. Inorganic

Explanation:

All man-made and most carbon-based compounds are inorganic

Answer:

inorganic

Explanation:

Answer:

a spectrum of the electromagnetic radiation emitted by a source.

D

Explanation:

A. The photons emitted when an electron drops down an energy level.

When a source emits electromagnetic radiation then the spectrum is called as emission spectrum. It is emitted during the process when an atom makes its transition of energy levels to ground state.

Ground state is the state where atom possesses the lowest energy. When an atom or molecule comes down from higher energy level to lower energy level, it emits the spectrum which is called as emission spectrum.

Answer:

Explanation:

The parameter to predict the spontaneity of a reduction is the change in the free energy, ΔG.

This is how it works:

In brief, free energy's decrease tells that a reaction is spontaneous, while free energy's increase tells a reaction is nonspontaneous.

Now, take the definition of the free energy:

The conditions given in the statement are:

Replacing in the equation ΔG = ΔH - TΔS, you get:

Then, you conclude that for an endothermic reaction with a negative entropy change, the change in the free energy is positive, and so the reaction is nonspontaneous (at all temperatures) in the forward direction.

Since, the change in the reverse direction has opposite sign, you also conclude that the reaction is spontaneous in the reverse direction at all temperatures.

True- it is a chemical change

True, the mixing of baking soda with vinegar is a chemical change.

Mixing of baking soda with vinegar is indeed a chemical change. This reaction occurs when the acetic acid in vinegar reacts with sodium bicarbonate (baking soda) to produce carbon dioxide gas, water, and sodium acetate. The formula for this reaction is:
NaHCO3 + CH3COOH → CO2 + H2O + CH3COONa. The bubbling and fizzing observed when these two substances are mixed is due to the release of carbon dioxide gas. Additionally, since vinegar is an acid and baking soda is a base, mixing the two results in a reaction that neutralizes the pH of the solution.

Answer:

18,8 kJ

Explanation:

Heat=(ΔH)*ν, where ν=m(CH₃OH)/M(CH₃OH). Then

[tex]Heat=\frac{m(CH_3OH)*H}{M(CH_3OH))}=\frac{15.8*38.0}{32} =18.76(kJ).[/tex]

Answer:

Explanation:

The formula Mg(NO₃)₂ is written as such using the combining powers of the atoms or group of atoms that constitutes the compound.

The combining powers correspond to the number of electrons usually lost or gained or shared by atoms of elements during chemical combination or the number of positive or negative charges carried by ions.

The elements and/or ions exchange directly their combining powers or their simplest whole number ratio during formation of chemical formulae of compounds.

The combining power is also called valency.

For the compound Mg(NO₃)₂, we have two ions combining together to form the compound.

Mg has a valency of 2+ and NO₃ is a radical(a group of atoms that behaves as a unit) with a valency of -1:

    Mg NO₃

Combining powers   2     1

Exchange of

Combining power   1   2

Formula of compound Mg(NO₃)₂

The name of the compound is Magnesium nitrate.

When the combining powers are exchanged, 2 goes to the nitrate ion and the 1 comes to the magnesium ion resulting in Mg(NO₃)₂

For some compounds, we reduce the powers to the simplest ratio first before exchange occurs. For example: CuO

  Cu   O

Combining

Power   2   2

Simplest

Ratio   1   1

Exchnage

Of combi-

ning power 1   1

Formula of compound CuO

Answer:

A. The Cl- ions become oxidized at the cathode allowing them to form Cl2 molecules.

Explanation:

At the anode in an electrolytic cell oxidation occurs.

In the electrolysis of NaCl, at the anode both Cl⁻ and OH⁻ migrates here.

Cl⁻ is preferentially discharged and it undergoes oxidation as shown below:

2Cl⁻ → Cl₂ + 2e⁻

We see a loss of electron and change in oxidation number of Cl from -1 to 0

Chlorine gas is liberated in this electrode.

Answer:

The Cl- ions become oxidized at the cathode allowing them to form Cl2 molecules.

Explanation:

Answer via Educere/ Founder's Education

Final answer:

Iron (Fe) in Fe2O3 has the lowest oxidation state (+3) among the given options, making Option C the correct answer.

Explanation:

To determine which of the following ions is in the lowest oxidation state, we can calculate the oxidation states of the central atoms in the given compounds:

Considering the calculated oxidation states, the lowest oxidation state among the options is for iron (Fe) in Fe2O3. Therefore, the correct answer is C. Fe in Fe2O3.

The correct answer is A. Brainliest would be much appreciated.

The oxidation state of [tex]Fe_2O_3[/tex] is +3. The bond formation between oxygen and iron depends on the difference in electronegativity between these two atoms. It starts with a charge of +3 and is reduced. Hence, option A is correct.

The total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom.

Oxygen in nearly all cases has a charge of 2−, so the total ionic charge the O atoms exhibit is 3(−2)=−6 .

If two Fe atoms equalize this charge and make it neutral, the charge (oxidation state) of Fe in this compound must be 3+.

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The enthalpy of this reaction is 0.882 kJ/mol.

Given the following data:

We know that the specific heat capacity of water is 4.184 J/g°C.

To find the enthalpy of this reaction:

First of all, we would determine the quantity of heat energy that was used during this chemical reaction by using the formula;

[tex]Q = mc\theta[/tex]

Where:

[tex]\theta = T_2 - T_1\\\\\theta = 24.70 - 21.00\\\\\theta = 3.70[/tex]

Substituting the values into the formula, we have:

[tex]Q = 114[/tex] × [tex]4.184[/tex] × [tex]3.70[/tex]

Quantity of heat, Q = 1764.81 Joules

Now, we can find the enthalpy of this reaction by using the formula;

[tex]Enthalpy = \frac{Energy}{Number\; of\; moles}[/tex]

Substituting the parameters into the formula, we have:

[tex]Enthalpy = \frac{1764.81}{2.00}[/tex]

Enthalpy = 882.405 J/mol.

In Kilojoules per mole of compound to three significant figures:

Note: 1 Kilojoules = 1000 Joules

[tex]Enthalpy = \frac{882.405}{1000}[/tex]

Enthalpy = 0.882 kJ/mol.

Therefore, the enthalpy of this reaction is 0.882 kJ/mol.

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To find the enthalpy of the reaction, we first calculate heat change with the equation q = msΔT, where m is mass, s is the specific heat, and ΔT is the change in temperature. The calculated heat energy is then divided by the number of moles of the compound to find the enthalpy. Thus, the enthalpy for the reaction described is approximately 0.886 kJ/mol.

To calculate the enthalpy of the reaction, we first need to calculate the heat change, noted as q. The equation for q in a reaction is q = msΔT where m is mass, s is the specific heat, and ΔT is the change in temperature.

First, transform the 114 grams of solution into mL since the density of water is approximately 1.0 g/mL. So the mass of the solution is 114 mL.

The change in temperature (ΔT) is 24.70°C - 21.00°C = 3.70°C. The specific heat (s) of water is 4.18 J/g°C. Using these figures, the calculation becomes: q = (114 g)(4.18 J/g°C)(3.70°C) = 1772.428 J or 1.772 kJ (keep in mind 1 kJ = 1000 J).

To find the enthalpy, which is expressed as kJ/mol, we divide the heat energy change by moles. So, the enthalpy = q (in kJ) / moles = 1.772 kJ / 2.00 mol = 0.886 kJ/mol.

Therefore, the enthalpy of this reaction is approximately 0.886 kJ/mol.

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Consider a galvanic (voltaic) cell that has the generic metals X and Y as electrodes. If X is more reactive than Y (that is, X more readily reacts to form a cation than Y does), classify the following descriptions by whether they apply to the X or Y electrode.

Because X is more reactive than Y, So X is oxidized to X²⁺ and Y²⁺ is reduced to Y. Therefore the overall cell reaction is:

X(s) + Y²⁺(aq) → X²⁺(aq) + Y(s)

X electrode: Electrons in the wire flow away from, Anions from the salt bridge flow toward, Anode, Loses mass

Y electrode: Electrons in the wire flow toward, Cations from the salt bridge flow toward, Cathode, Gains mass

Grade:  9

Subject:  chemistry

Chapter:  a galvanic (voltaic) cell

Keywords:  galvanic (voltaic) cell, the generic metals, cathode, anode, salt bridge

Electrons flow from anode to cathode in a voltaic cell.

A voltaic cell is one in which electrical energy is produced by a redox reaction. Electrons flow from anode to cathode in a voltaic cell and the cell reaction is spontaneous.

Given a generic voltaic cell in which metal X is more reactive than metal Y, it follows that;

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Answer:

D. 15,000.

Explanation:

KE = (3/2)KT

Where, KE is the kinetic energy of the molecules (J),

K is the Boltzmann constant (1.381 × 10⁻²³ J/K),

T is the temperature (K) 

So, the right choice is: D. 15,000

Answer: D. 15,000.

Explanation: Founders Educere answer. And whatever that dude said^

Answer:

A. An acid donates an H⁺, and a base accepts an H⁺.

Explanation:

According to Bronsted-Lowry Model :

Answer:

The letter A is the right answer.

Explanation:

Danish Johannes Nicolaus Brönsted (1879-1947) and Englishman Thomas Martin Lowry (1874-1936) proposed an acid-base theory known as the Brönsted-Lowry theory, which reads as follows:

Acid is a chemical substance that necessarily donates H⁺ protons, while a Base is a chemical substance that necessarily receives H⁺ protons.

In this case, the proton is considered the hydrogen ion. This is seen in the following reaction, where hydrocyanic acid donates a proton to water, which acts as a base:

HCN + H2O → CN- + H3O⁺  

This reaction is reversible, and the hydronium ion (H3O +) can donate a proton to the CN- ion. Thus, hydronium ion (H3O +) acts as acid and CN- as base.

CN- + H3O⁺→ HCN + H2O

Letter D is the answer

The correct answer is D. Brainliest would be much appreciated.

Nitrogen changes from +5 in [tex]NO_3[/tex]- to +2 in NO. This means nitrogen has gained 3 electrons. Option B

To determine the change in electrons for nitrogen in the given reaction, we need to compare the oxidation state of nitrogen in the reactant ([tex]NO_3[/tex]-) and the product (NO).

In the reactant, -, nitrogen is in the +5 oxidation state. This is because oxygen has an oxidation state of -2, and there are three oxygen atoms in [tex]NO_3[/tex]-. Therefore, nitrogen must have an oxidation state of +5 to balance the overall charge of [tex]NO_3[/tex]-.

In the product, NO, nitrogen is in the +2 oxidation state. This is because oxygen has an oxidation state of -2, and there is only one oxygen atom in NO. Therefore, nitrogen must have an oxidation state of +2 to balance the overall charge of NO.

By comparing the oxidation states of nitrogen in the reactant and the product, we can determine the change in electrons. The change in oxidation state corresponds to the change in the number of electrons gained or lost by the nitrogen atom.

In this case, nitrogen changes from +5 in [tex]NO_3[/tex]- to +2 in NO. This means nitrogen has gained 3 electrons.

Therefore, the correct answer is B) Gain 3 electrons.

The nitrogen atom undergoes a reduction because it gains electrons, reducing its oxidation state from +5 to +2 in the reaction.

Option B

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your answer should be C.

MARK ME BRAINLIEST PLEASE!

Answer: The correct answer is Option c.

Explanation:

All the radioactive reactions follows first order kinetics.

The equation used to calculate half life for first order kinetics:

[tex]t_{1/2}=\frac{0.693}{k}[/tex]

We are given:

[tex]t_{1/2}=1hr[/tex]

Putting values in above equation, we get:

[tex]k=\frac{0.693}{1}=0.693hr^{-1}[/tex]

Rate law expression for first order kinetics is given by the equation:

[tex]k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}[/tex]

where,  

k = rate constant = [tex]0.693hr^{-1}[/tex]

t = time taken for decay process = 3.00 pm - 12.00 pm = 3 hour

[tex][A_o][/tex] = initial amount of the reactant = 20 g

[A] = amount left after decay process =  ?

Putting values in above equation, we get:

[tex]0.693hr^{-1}=\frac{2.303}{3hr}\log\frac{20}{[A]}[/tex]

[tex][A]=2.5g[/tex]

Hence, the correct answer is Option c.

Answer:

See below  

Explanation:

The half-cell reduction potentials are

 Ag⁺(aq) +   e⁻ ⇌ Ag(s)     E° =  0.7996 V

Co²⁺(aq) + 2e⁻ ⇌ Co(s)     E° = -0.18      V

To create a spontaneous voltaic cell, we reverse the half-reaction with the more negative half-cell potential.

We get the cell reaction :

Anode:     Co(s)                 ⇌ Co²⁺(aq) + 2e⁻

Cathode: 2Ag⁺(aq) +   2e⁻ ⇌ 2Ag(s)                          

Overall:  Co(s) + 2Ag⁺ (aq) ⇌ Co²⁺(aq) + 2Ag(s)