What happens if you break a magnet in half?


a) Each half will be a new magnet, with both a north and south pole.


b) One half will have a north pole only and one half will have a south pole only.


c) Neither half will have a pole.


d) Neither half will be able to attract or repel

Answer:

The correct answer is 0.00582 grams.

Explanation:

In order to solve the question, let us consider the vapor pressure of H2O, as hydrogen gas is collected over water, therefore, we have to consider the vapor pressure of water in the given case. Let us assume that the pressure is 760 torr or 1 atm.

It is known that the vapor pressure of water at 40 degree C is 53.365 torr (Based on the data).

Therefore, the pressure of H2 will be,

P = 760-55.365 = 704.635 torr or 704.635/760 = 0.9272 atm

The volume of the hydrogen gas collected in the tube is 80 ml or 0.08 L

Temperature in Kelvin will be 40+273 = 313 K

To calculate the moles of hydrogen (H2) gas, there is a need to use the ideal gas equation, that is, PV= nRT, in this R is the gas constant, whose value is 0.0821 L atm/molK, and n is the moles of the gas.

By inserting the values in the equation we get:

PV = nRT

n = PV/RT = 0.9272 *0.08 / 0.0821 * 313

n = 0.00289 moles

The mass of H2 will be moles * molar mass = 0.00289 * 2.016

= 0.00582 grams.

Answer:

I am pretty sure the answer is c)

Explanation:

Alkali Metals, Alkaline Earth Metals, Transition Metals, Metalloids or Semimetals, Nonmetals, Halogens, and Noble Gases are the groups.

HOPE I HELPED :)

Final answer:

The periodic table is arranged by aligning groups with common properties, based on atomic number, into periods and groups. Elements in the same group share similar chemical properties, aiding in the study of chemical behavior.

Explanation:

The question asks how the periodic table of the elements is arranged. The correct answer is that the elements in the periodic table are arranged by aligning groups with common properties. In more detail, the periodic table is organized based on the atomic number of elements, and they are placed in a layout where they form rows called periods and columns known as groups. These groups are numbered 1-18, and elements within the same group share many chemical properties. This organization allows for the grouping of elements with similar properties and helps in the study of their chemical behavior.

For instance, the alignment is such that the elements are ordered in terms of increasing atomic number from left to right across the table. This arrangement makes it easy for us to identify elements with similar properties because they are positioned in the same column. The periodic table includes seven horizontal rows (periods) and 18 vertical columns (groups), making it a powerful tool for understanding chemical reactions and properties of elements. This systematic arrangement reflects the periodic law, which states that the properties of elements are periodic functions of their atomic numbers.

Answer: Please see below for answer

Explanation:A thermosetting polymer is a polymer that consists a of cross-linked structure or heavily network of branched molecules.

Elastomers are loosely cross-linked polymers which are highly flexible and elastic which can make them stretch easily and return to thier original shapes.

a) Linear and highly crystalline polyethylene is a linear thermoplastic it will not be an elastomer or themoset.

.

(b) Phenol-formaldehyde is anetwork structured thermosetting  resin which is regarded  as  the most useful thermosetting resin especially in the production of wood based panels.

(c) Heavily crosslinked polyisoprene having a glass-transition temperature of 50 deg C is a  thermoset since it is heavily cross linked above room temperature.

(d) Lightly crosslinked polyisoprene having a glass-transition temperature of -60 deg C is both an elastomer and thermoset since it has both characteristics .

(e) Linear and partially amorphous poly (vinyl chloride) is a thermoplastic and not  an elastomer or a thermoset.

In polymers the crystalline order is often set up by a regular arrangement of  the chains. Therefore what you would expect to be elastomers and which thermosetting polymers at room temperature are;

   a. Linear and crystalline polyethylene would be  neither an elastomer nor a thermoset because it is  a linear polymer.

     b. Phenol-formaldehyde is said too have a network  structure called thermosetting polymer  because it has a network structure. It would therefore not be  an elastomer as it does not have a crosslinked  chain structure.

    c. Heavily crosslinked polyisoprene having a  glass transition temperature of 50°C can be a  said to be a thermosetting polymer due to the fact that it is heavily  crosslinked. It cannot not be an elastomer because it  is heavily crosslinked and room temperature is  below its Tg.

   d. Linear and partially amorphous poly(vinyl  chloride) is said to be neither an elastomer nor a  thermoset. If it want to be any of thee both, it must have  some crosslinking.

Polymers is said to be crystallized from a solution or upon evaporation of a solvent but it based on the degree of dilution.

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Answer:

X: 2,8 = Neon

Y: 2,8,7= Chlorine

Neon has an atomic number of 10. It is referred to as a noble gas and it’s a mono atomic element.

Chlorine has an atomic number of 17. It is referred to as an Halogen. Chlorine exists in nature as a diatomic molecule.

However the question is incomplete and will need more information.

Answer:

0.1 M KOH

Explanation:

The thymol blue indicator will appear blue in a basic solution, particularly in a solution with a pH greater than 8.0. A diluted sodium hydroxide solution is an example of such a basic environment where thymol blue would turn blue.

The thymol blue indicator will appear blue in a basic solution. Specifically, thymol blue changes color from yellow to blue over a pH range of approximately 8.0 to 9.6. This means that for thymol blue to exhibit a blue color, it needs to be in a solution with a pH greater than 8.0, indicating a basic environment.

An example of a solution in which thymol blue would appear blue is a diluted sodium hydroxide (NaOH) solution, as NaOH is a strong base that would increase the pH of the solution.

Answer:

Explanation:

Global winds are the winds that occur in the belts that are found all over the planet. Like local winds, global winds are caused by differences in heat in the atmosphere.

Polar Easterlies, from 60-90 degrees latitude.

Prevailing Westerlies, from 30-60 degrees latitude.

Tropical Easterlies, from 0-30 degrees latitude.

Answer:

A,C,D

Explanation:

I was very confused because I wasn't sure for this question so i went on brainly to find a answer and all of them said A,B,C and i was confused cause that was not right low and behold i put in this as a geuss and it was right hope this helped anyone wondering!! but correct answer is A,C,D

Answer:   11.6g of estrogen are needed to generate an osmotic pressure of 4.45 atm when dissolved in 234 ml of a benzene solution at 298 K.

Explanation:

To calculate the amount of solute, we use the equation for osmotic pressure, which is:

[tex]\pi=iMRT[/tex]

Or,

[tex]\pi=i\times \frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}\times RT[/tex]

where,

[tex]\pi[/tex] = osmotic pressure of the solution = 4.45 atm

i = Van't hoff factor = 1 (for non-electrolytes)

Let Mass of solute (estrogen)  = x g  

Volume of solution = 234 mL

R = Gas constant = [tex]0.0821Latmmol^{-1}K^{-1}[/tex]

T = temperature of the solution = [tex]298K[/tex]

Putting values in above equation, we get:

[tex]4.45=1\times \frac{x\times 1000}{272.4\times234}\times 0.0821Latmmol^{-1}K^{-1}\times 298K[/tex]

[tex]x=11.6g[/tex]

Hence, 11.6g of estrogen are needed to generate an osmotic pressure of 4.45 atm when dissolved in 234 ml of a benzene solution at 298 K.

The question is about calculating the quantity of estrogen needed to generate a specific osmotic pressure in a benzene solution using the Van 't Hoff equation. The moles of estrogen needed is calculated first, then converted into grams using the molar mass of estrogen.

This question is based on the concept of osmotic pressure and solution chemistry, for a nonvolatile, nonelectrolyte compound in solution. The Van 't Hoff equation (π= nRT/V) can be used to solve the problem, where π refers to the osmotic pressure, n is the amount of solute in moles, R is the gas constant (0.0821 L·atm/K·mol for this problem), T is the temperature in Kelvin, and V is the volume in liters. Given the osmotic pressure (4.45 atm), the temperature (298 K), and the volume (0.234 L), you can find the number of moles of estrogen needed. After calculating the amount in moles, use the molar mass of the estrogen (272.4 g/mol) to find the mass in grams. Hence, the quantity of estrogen needed can be calculated.

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Answer:

See explanation below

Explanation:

This reaction is known as Ketone hydrolisis in acid medium. This involves the formation of an hemi cetal, and then, the acetal. This is often used to convert ketones or aldehydes in ethers.

The first step involves the reaction with the acid. The carbonile reacts with the acid and forms an alcohol there. The next step is the reaction of the alcohol, in this case, the methanol to form the hemi cetal. Then in the third step, we repeat the first step, using acid to turn the OH group into a great leaving group such water. Then the water leaves the molecule, leaving the space wide open in the next step for methanol, and the acetal is formed.

See picture for the curved arrow mechanism

Protonation of 4-methylpentan-2-one creates a positive carbon center. First, methanol attacks this center, then a proton transfer occurs. After water is lost forming an oxonium ion, a second methanol attacks the intermediate and deprotonation results in an acetal.

In order to draw the curved arrow mechanism for the formation of an acetal from acidic methanol and 4-methylpentan-2-one, we proceed as follows:

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Answer:

11.6g of NH₃(g) have to react

Explanation:

For the reaction:

4 NH₃(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(g) ΔH = -905kJ

4 moles of ammonia produce 905kJ

Thus, if you want to produce 154kJ of energy you need:

154kJ × (4 mol NH₃ / 905kJ) = 0.681moles of NH₃. In mass -Molar mass ammonia is 17.031g/mol-

0.681mol NH₃ × (17.031g / mol) = 11.6g of NH₃(g) have to react

Answer:

The new elution order expected will be the following:

Please see below for details and explanation.

Explanation:

Which compound will elute first depends on a number of factors. The compound with the lowest boiling point will elute before another compound with a higher boiling point and so on. By extension, the volatility of the compound will also be considered when predicting elution order. Thirdly, how the solutes interact with each other during the stationary phase. I've listed the boiling points below:

1-pentanol 138 °C

ethylene diamine 116 °C

diethylene glycol 245 °C

The advantage of using temperature programmed chromatogram is that it changes retention times (time needed for the solute to pass through the column). And it will be according to the respective boiling points.

Hope that answers the question, have a great day!

Answer:

decrease

Explanation:

Answer:

The Earth's bioshere consist of the parts of Earth where life exists. Ecosystems.

Explanation:

Using Boyle's Law which states that P1V1 = P2V2 for a gas at constant temperature, and given the initial conditions of 1.0 atm and 750 mL, when the volume decreases to 610 mL, the new pressure is calculated to be 1.23 atm.

The question relates to the behavior of gases under different pressures and volumes, which is generally described by Boyle's Law. Boyle's Law states that for a given mass of gas at constant temperature, the volume of the gas varies inversely with the pressure. We use the formula P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the new pressure and volume.

Given that the initial pressure (P1) is 1.0 atm and the initial volume (V1) is 750 mL, and the final volume (V2) is 610 mL, we want to find the new pressure (P2). Rearranging the formula to solve for P2 gives us P2 = P1V1/V2. Substituting our known values in we get:

P2 = (1.0 atm * 750 mL) / 610 mL = 1.23 atm (rounded to two decimal places).

Therefore, the new pressure when the volume is decreased to 610 mL while maintaining a constant temperature is 1.23 atm.

Answer:

1.45 mol

Explanation:

Given data

Step 1: Calculate the absolute temperature (Kelvin)

We will use the following expression.

[tex]K = \°C + 273.15\\K = 20\°C + 273.15 = 293K[/tex]

Step 2: Calculate the number of moles (n) of the gaseous sample

We will use the ideal gas equation.

[tex]P \times V = n \times R \times T\\n = \frac{P \times V}{R \times T} = \frac{3.98atm \times 8.77L}{\frac{0.0821atm.L}{mol.K} \times 293K} = 1.45 mol[/tex]

Answer:

C) 3.40 x 10-3

Explanation:

Hello,

In this case, for the given pOH, we are able to compute the concentration of hydrixide ions by applying the following formula:

[tex]pOH=-log([OH^-])[/tex]

[tex][OH^-]=10^{-pOH}=10^{-2.468}\\[/tex]

[tex][OH^-]=0.0034M=3.4x10^{-3}M[/tex]

Therefore, answer is C).

Best regards.

Answer:

3.40 × 10⁻³ M

Explanation:

The pOH scale is used to express the acidity or basicity of a solution.

The pOH of this solution is 2.468, so it is basic. We can calculate the concentration of hydroxide ions in the solution using the following expression.

[tex]pOH = -log [OH^{-} ]\\\[[OH^{-}] = antilog-pOH = antilog-2.468 = 3.40 \times 10^{-3} M[/tex]

Answer:

The mass of the solute and the volume of the solution.

Explanation:

Hello,

In this case, given the formula of molarity:

[tex]M=\frac{n_{solute}}{V_{solution}}[/tex]

In such a way, since the moles could not be directly measured, we must measure the mass of the solute and by using its molar mass, one could compute its moles. Moreover, since the solution is composed by the solvent (typically water) and the solute, we consequently must measure the volume of the solution needed for the preparation of such concentration-known solution. In such a way, we can actually prepare the required solution.

Best regards.

For the formation of 2 M solution of potassium nitrate, mass and volume of the solution has been measured.

Molarity can be defined as the mass of solute present in a liter of solution. The molarity has been used for the determination of the concentration of the compounds.

It can be expressed as mol/L. The molarity (M) has expression:

[tex]M=\rm \dfrac{solute\;mass}{solute\;molar\;mass}\;\times\;Solution\;Volume[/tex]

For the formation of 2 M potassium nitrate solution, the mass of the solute and the volume of the solution has to be measured.

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Answer:

The molecular weight of this compound is 386.4 g/mol

Explanation:

Step 1: Data given

MAss of the compound = 11.09 grams

Volume of diethyl ether = 180.9 mL

Osmotic pressure = 3.88 atm

Temperature = 298 K

The compound =  nonvolatile and non-electrolyte

Step 2: Calculate molar concentration

π = i*M*R*T

⇒with π = the osmotic pressure = 3.88 atm

⇒with i = the van't Hoff factor = 1

⇒with C = the molar concentration = = TO BE DETERMINED

⇒ with R = the gas constant = 0.08206 L*atm/mol*K

⇒with T = 298 K

C = 3.88 / (0.08206*298)

C = 0.1587 M

Step 3: Calculate moles compound

C = moles / volume

moles = 0.1587 M * 0.1809 L

Moles compound = 0.0287 moles

Step 4: Calculate molecular weight of the compound

Molar mass = mass / moles

Molar mass compound = 11.09 grams / 0.0287 moles

Molar mass compound = 386.4 g/mol

The molecular weight of this compound is 386.4 g/mol

Answer:

pH = 8.93

Explanation:

In this case, this titration is the case of a weak acid and a strong base. Now, at the equivalence point, it's supposed that we have the same moles of each reactant in solution, and we will expect that the pH would have to be 7. However, as the acid is pretty weak, there's a little difference in the solution because of the grade of dissociation of the acid, and the pH will be higher than 7. To know this, we first need to calculate the volume of added base:

M₁V₁ = M₂V₂

With this expression, let's calculate the volume of the base:

V₂ = M₁V₁ / M₂

V₂ = 0.1917 * 220 / 0.1787 = 236 mL

So, at the equivalence point, 236 mL are needed to neutralize this reaction. As the moles are the same for each reactant, we just need to calculate the concentration of the acid in this part. This will be the sum between the initial volume of acid and the calculated volume of base:

V of solution = 236 + 220 = 456 mL or 0.456 L

Then, the new concentration of the acid is:

[C₂H₅COOH] = 0.1917 * 0.220 / 0.456 = 0.0924 M

Now, the reaction with the base is the following:

C₂H₅COOH + KOH --------> C₂H₅COOK + H₂O

This means that in the equivalence point we have the propionic potassium and water, so, if take this and dissociates into it's ions we can calculate the pH of the solution:

C₂H₅COO⁻ + H₂O <-------> C₂H₅COOH + OH⁻

With this reaction in solution in the equivalence point, we just need the Kb of propionate ion, and this can be calculated with the value of the pKa of the acid:

Ka = 10^(-pKa)

Ka = 1.29x10⁻⁵

Now the value of Kb can calculated using the following expression:;

Kb = Kw / Ka ---> replacing we have

Kb = 1x10⁻¹⁴ / 1.29x10⁻⁵

Kb = 7.75x10⁻¹⁰

Now, with this value and the above reaction we can write an ICE chart to calculate the [OH⁻] and then, the pH of solution:

     C₂H₅COO⁻ + H₂O --------> C₂H₅COOH + OH⁻   Kb = 7.75x10⁻¹⁰

i)       0.0924                                    0               0

e)     0.0924-x                                  x               x

The Kb expression:

Kb = [C₂H₅COOH] [OH⁻] / [C₂H₅COO⁻]

7.75x10⁻¹⁰ = x² / 0.0924-x ---> Kb is very small, so this substraction can be neglected to just 0.0924 assuming x will be very small too.

7.75x10⁻¹⁰ = x² / 0.0924

7.75x10⁻¹⁰ * 0.0924 = x²

x = [OH⁻] = 8.46x10⁻⁶ M

With this value, we can calculate pOH and then the pH:

pOH = -log(8.46x10⁻¹⁰) = 5.07

Finally the pH:

pH = 14 - pOH

pH = 14 - 5.07

Answer:

decrease the molar solubility of the solid relative to its molar solubility in pure water.

Explanation:

The common ion effect is defined as a decrease in the solubility of a solute because of the addition of a second solute with which it has a common ion. If a solution already contains a solute MX and another ionic solid containing BX is added to the solution, the X^- anion is common to the both species. Hence the presence of MX will decrease the solubility of BX compared to the solubility of BX in pure water.

Generally, when a soluble ionic solid is placed in a solution containing a common ion, the molar solubility of the solid decreases compared to its molar solubility in pure water.

Answer: The amount of heat released is 42739 Joules

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

[tex]Q=m\times c\times \Delta T[/tex]

Q = Heat released =?

c = heat capacity of granite = [tex]0.790J/g^0C[/tex]

Initial temperature  = [tex]T_i[/tex] = [tex]41.2^0C[/tex]

Final temperature of the calorimeter  = [tex]T_f[/tex]  = [tex]-12.9^0C[/tex]

Change in temperature ,[tex]\Delta T=T_f-T_i=(-12.9-41.2)^0C=-54.1^0C[/tex]

Putting in the values, we get:

[tex]Q=1000g\times 0.790J/g^0C\times -54.1^0C=-42739J[/tex]

As heat comes out to be negative, that means the heat has been released and the amount of heat released is 42739 Joules

Answer:

9.1 KJ

Explanation:

We must first put down the reaction equation;

H2(g) + Br2(g) ----> 2HBr(g)

Secondly we find the number of moles of HBr involved;

number of moles of HBr= mass of HBr/ molar mass of HBr

But molar mass of HBr= 80.91 g/mol

Given mass of HBr as given in the question= 20.1g

Hence;

Number of moles of HBr= 20.1 g/80.91g

Number of moles of HBr= 0.25 moles of HBr

Lastly we calculate the heat transferred from the number of moles involved;

If 2 moles of HBr has a heat of formation of 72.80KJ

Then 0.25 moles of HBr will have a heat of formation of 0.25× 72.80/2= 9.1 KJ

Then; 20.1 g of HBr will have a heat of formation of 9.1 KJ

Answer:

[tex]m = 1\,g[/tex]

Explanation:

The molarity is the ratio of the amount of moles solvent to volume of the solute.

[tex]0.010\,M = \frac{0.010\,moles\,NaOH}{1\,L}[/tex]

The quantity of solute is determined by simple rule of three:

[tex]n = \left(\frac{2.5\,L}{1\,L} \right)\cdot (0.010\,mole)[/tex]

[tex]n = 0.025\,moles[/tex]

The molecular weight of NaOH is [tex]39.997\,\frac{g}{mole}[/tex], the mass of solute is:

[tex]m = 1\,g[/tex]

Final answer:

The reaction in question demonstrates the application of Le Chatelier's Principle, with shifts in equilibrium occurring in response to decreased pressure, increased temperature, and the removal of a reactant.

Explanation:

The reaction presented is dealing with changes in reaction conditions in a chemical equilibrium situation. This is directly related to Le Chatelier's Principle, which states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium moves to counteract the change. In this scenario:

Answer:

conc. fuming, 1 mol H2SO4

Dilute NaOH

Br2

Dilute H2SO4

Explanation:

The  synthesis of ortho-bromophenol follows the reaction sequence shown in the image attached.

First of all, the phenol is sulphonated using concentrated sulphuric acid at 100°C.  Carrying out the reaction at 100°C ensures that the para-isomer predominates. Lower temperatures favour the formation of the ortho isomer. Dilute sodium hydroxide is added before the addition of bromine.

Bromine molecule is then added. The incoming electrophile now attaches to the ortho position. Dilute acid is  added at 100°C to remove the -SO3H thereby obtaining the Ortho-bromophenol

Answer:

Check the explanation

Explanation:

Kindly check the attached image below to see the step by step explanation to the question above.

Answer: Concentration of N₂ is 4.8.[tex]10^{9}[/tex] M.

Explanation: [tex]K_{c}[/tex] is a constant of equilibrium and it is dependent of the concentrations of the reactants and the products of a balanced reaction. For

N2(g) + 2 O2(g) ⇄ 2 NO2(g)

[tex]K_{c}[/tex] = [tex]\frac{[NO2]^{2} }{[N2][O2]^{2} }[/tex]

From the question concentration of NO2 is twice of O2:

[NO2] = 2[O2]

Substituting this into [tex]K_{c}[/tex]:

[tex]K_{c}[/tex] = [tex]\frac{[2O2]^{2} }{[N2][O2]^{2} }[/tex]

8.3.[tex]10^{-10}[/tex] = [tex]\frac{4O2^{2} }{[N2].O2^{2} }[/tex]

[N2] = [tex]\frac{4O2^{2} }{8.3.10^{-10}.O2^{2} }[/tex]

[N2] = [tex]\frac{4}{8.3.10^{-10} }[/tex]

[N2] = 4.8.[tex]10^{9}[/tex]

The concentration of N2 in the equilibrium is [N2] = 4.8.[tex]10^{9}[/tex]M.

The concentration of [tex]N_2[/tex] is [tex]4.8.10^9M[/tex]

Since k_e represent the equilibrium constant and based on the concentrations of the reactants and the products of a balanced reaction.

Also, the reaction: N2(g) + 2 O2(g) ⇌ 2 NO2(g), And, the concentration of NO2 is twice the concentration of O2 gas

Kc = 8.3 × 10-10 at 25°C.

NO2 is twice of O2.

Now

[tex]8.310^{-10} = \frac{4O_2^2}{N_2O_2^2} \\\\N_2 = \frac{4O_2^2}{8.3.10^{-10}O_2^2}\\\\ = 4\div 8.3.10^{-10}\\\\= 4.8.10^9[/tex]

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Answer:

5 kJ/g  

Explanation:

There are two energy flows in this reaction.

q₁ = heat from reaction

q₂ = heat to warm the solution

 q₁   +    q₂     = 0

m₁ΔH + m₂CΔT = 0

Data:

m₁ = 0.258 g

V₂ = 100 mL

  C = 4.184  J°C⁻¹g⁻¹

T_i = 22 °C

T_f = 25.1 °C

Calculations

(a) Mass of solution

[tex]\text{Mass} = \text{100 mL} \times \dfrac{\text{1.00 g}}{\text{1 mL}} = \text{100 g}[/tex]

(b) ΔT

ΔT = T_f - T_i = 25.1 °C - 22 °C = 3.1°C

(c) ΔH

[tex]\begin{array}{ccccl}m_{1}\Delta H & +& m_{2}C \Delta T& = &0\\\text{0.258 g}\times \Delta H& + & \text{100 g} \times 4.184 \text{ J$^{\circ}$C$^{-1}$g$^{-1}$} \times 3.1 \, ^{\circ}\text{C} & = & 0\\0.258 \Delta H \text{ g} & + & \text{1300 J} & = & 0\\&&0.258 \Delta H \text{ g} & = & \text{-1300 J} & & \\& &\Delta H & = & \dfrac{\text{-1300 J}}{\text{0.258 g}}\\\\& & & = & \text{-5000 J/g}\\& & & = & \textbf{-5 kJ/g}\\\end{array}[/tex]

[tex]\text{The reaction produces $\large \boxed{\textbf{5 kJ}}$ per gram of potassium.}[/tex]

Note: The answer can have only one significant figure because you measured the initial temperature of the water only to the nearest degree.

From the calculation, the heat generated from the solution is -194.4 kJ/mol

A calorimeter is an instrument that is used to measure heat.

Now we know that number of moles of the potassium = 0.258 g /39 g/mol = 0.0066 moles

Total mass present = 0.258 g + 100 g = 100.258 g

Temperature change = 25.1°C  - 22°C = 3.1°C

Now;

H = -(100.258  * 4.128 *  3.1)/ 0.0066

= -194.4 kJ/mol

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Answer:

9.1 seconds

Explanation:

Given that for a second order reaction

1/[A]t = kt + 1/[A]o

Where [A]t= concentration at time = t= 0.340M

[A]o= initial concentration = 0.820M

k= rate constant for the reaction=0.190m-1s-1

t= time taken for the reaction (the unknown)

Hence;

(0.340)^-1 = 0.190×t + (0.820)^-1

t= (0.340)^-1 - (0.820)^-1/0.190

t= 9.1 seconds

Hence the time taken for the concentration to decrease from 0.840M to 0.340M is 9.1 seconds.

Final answer:

To calculate the time it takes for the concentration of compound A to decrease in a second-order reaction, the integrated rate law 1/[A] - 1/[A]0 = kt is used with the provided rate constant and initial and final concentrations.

Explanation:

Calculating Time for a Second-Order Reaction:

The question pertains to the time it takes for the concentration of compound A to decrease from 0.820 M to 0.340 M in a second-order reaction with a rate constant of 0.190 M-1·s-1 at 300 °C. The integrated rate law for a second-order reaction is given by:

1/[A] - 1/[A]0 = kt

Where [A]0 is the initial concentration, [A] is the concentration at time t, k is the rate constant, and t is the time. Using the provided concentrations, we can solve for t:

1/0.340 M - 1/0.820 M = (0.190 M-1·s-1)t

After calculating the left side, we can isolate t:

t = (1/0.340 M - 1/0.820 M) / (0.190 M-1·s-1)

Hence:

(0.340)^-1 = 0.190×t + (0.820)^-1

t= (0.340)^-1 - (0.820)^-1/0.190

t= 9.1 seconds

Hence the time taken for the concentration to decrease from 0.840M to 0.340M is 9.1 seconds.

Answer:

See explaination

Explanation:

The electrons geometry shows the special distribution of the electrons around of the central atom of the molecule.

The molecular geometry shows the special distribution of the atoms that form the molecule.

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