What does it mean when phenol red turns yellow?

Answer:

Explanation:

The reaction undergoing least change in volume will have lowest change in entropy .

1 ) C₂H₂(g) + 5/2O₂(g) → 2CO₂(g) + H₂O(g)

change in volume = 2.5 +1 - ( 2 + 1 ) = 0.5

2 ) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

change in volume = 2 +1 - ( 2 + 1 ) = zero

3 ) C₂H₆(g) + 7/2O₂(g) → 2CO₂(g) + 3H₂O(g)

change in volume = 3 +2 - ( 3.5  + 1 ) = 0.5

4 ) C₂H₄(g) + 3O₂(g) → 2CO₂(g) + 2H₂O(g)

change in volume = 2 +2 - ( 3  + 1 ) = zero

Hence least change in volume is in case no - 2 and 4 .

In reaction

C₂H₄(g) + 3O₂(g) → 2CO₂(g) + 2H₂O(g) and

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

∆S° or change in entropy is least .

Answer:

true true true true true

Answer:

True

Explanation:

The answer is true

The cell notation for the electrochemical cell with a Pb(s) anode oxidized to Pb²⁺(aq) and a platinum electrode cathode where Fe³⁺(aq) is reduced to Fe²⁺(aq) is:

Pb(s)|Pb²⁺(aq, 1M)||Fe³⁺(aq, 1M), Fe²⁺(aq, 1M)|Pt(s)

The cell notation for the given electrochemical cell can be represented as follows:

Pb(s)|Pb²⁺(aq, 1M)||Fe³⁺(aq, 1M), Fe²⁺(aq, 1M)|Pt(s)

In this notation, the single vertical line "|" represents a phase boundary, while the double vertical lines "||" represent the salt bridge that connects the two half-cells. The anode (where oxidation occurs) is written on the left, and the cathode (where reduction occurs) is written on the right.

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Answer:

yes

Explanation:

Answer:

yes

Explanation:

you're smart have a nice evening

Answer:

the correct answer is ecosystem

Answer:

ecosystem

Explanation:

Answer: wut the are you asking for like an essay

Explanation:

After 10 days, there will be approximately 15,625 radioactive atoms left.

What is radioactive?
The process through which an unstable nucleus loses energy through radiation is known as radioactive decay, also recognised as nuclear decay, radioactive contamination, radioactive disintegration, as well as nuclear disintegration. A substance that has unstable nuclei is regarded as radioactive. Alpha decay, beta decay, and gamma decay are three of the most frequent types of decay, and they all involve the emission of one or even more particles. Beta decay is a result of the weak force, while the nuclear force and electromagnetism are in charge of the other two mechanisms. Electron capture, which occurs when an unstable nucleus seizes an inner electron in one of the electron shells, is the fourth common type of decay.

This is because the half life of the nuclide is 2 days, meaning that after 2 days, half of the 100,000 atoms will have decayed and only 50,000 atoms will remain. After 10 days, the number will have halved 6 times, leaving 15,625 atoms (50,000/2^6).

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Answer:

Explanation:

The methyl orange indicator is typically yellow in an acidic solution with a pH below 4. If the solution is a hydrochloric acid, the indicator will likely turn red, as hydrochloric acid has a pH of around 1. If the solution has a pH between 4 and 6, the methyl orange indicator will appear orange.

Answer:

The atomic combinations can be matched to the appropriate functional groups as follows:

- A. C-O-C: C. Ester

- B. O=C-O-H: B. Carboxylic acid

- C. O=C-O-C: C. Ester

- D. C-O-H: A. Alcohol

Explanation:

Answer:is D.the wave theory of light

Explanation:

cuz i got it wrong :( but the answer is correct :3

Answer:

D) wave theory of light

Explanation:

Answer:

yes it can

Explanation:

because, it depends on where the rock is, for example on a dessert it would Be cracked and things like that if near an eruption it would be the flamey black rock, and so on you get it

Answer:

Mass = 15.12 g

Explanation:

Given data:

Mass of sodium borohydride = ?

Number of moles of sodium borohydride =0.40 mol

Solution:

Formula:

Mass = number of moles / molar mass

Molar mass of sodium borohydride = 37.8 g/mol

By putting values,

Mass = 0.40 mol × 37.8 g/mol

Mass = 15.12 g

Exothermic changes give out energy to their surroundings, causing an increase in heat endothermic changes, take in energy, so the opposite takes place.

When using a pH meter to monitor a stirring reaction mixture, the pH sensor electrode should be placed in the solution that is being stirred. This is important because the pH of the solution can change as the reaction progresses. By placing the electrode in the solution, it allows for accurate monitoring of the pH changes in real-time.

To place the pH sensor electrode correctly, follow these steps:
1. Ensure that the pH meter is calibrated according to the manufacturer's instructions.
2. Rinse the pH electrode with distilled water to remove any residual substances.
3. Gently dry the electrode with a tissue or soft cloth.
4. Insert the pH sensor electrode into the reaction mixture, ensuring that it is fully submerged.
5. Make sure that the electrode is positioned away from any solid particles or stirring bars that may interfere with the measurement.
6. Start the stirring process and allow the reaction to proceed.
7. Read and record the pH value displayed on the pH meter as needed during the reaction.

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Therefore, approximately 6.16 grams of AgNO₃ are needed to make 250 mL of a solution with a concentration of 0.145 M.

To calculate the grams of AgNO₃ needed to make a 250 mL solution with a concentration of 0.145 M, we can use the formula:

Molarity (M) = moles of solute / volume of solution (L)

First, we need to convert the volume of the solution from milliliters to liters:

Volume = 250 mL = 250 mL / 1000 mL/L = 0.250 L

Next, we rearrange the formula to solve for moles of solute:

moles of solute = Molarity × volume of solution

moles of solute = 0.145 M × 0.250 L = 0.03625 mol

Finally, we can calculate the grams of AgNO₃ using its molar mass:

grams of AgNO₃ = moles of solute × molar mass of AgNO₃

grams of AgNO₃ = 0.03625 mol × (107.87 g/mol + 14.01 g/mol + 3(16.00 g/mol))

grams of AgNO₃ ≈ 0.03625 mol × 169.87 g/mol ≈ 6.16 g

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The correct lewis structure of methane(CH4)

C. H:C:H:H

The volume of the weather balloon after it rises to an altitude where the temperature is -8°C is 140.46 L.

An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.

Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.

An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect on the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable.

Using the ideal gas equation:-

Given;

V₁ = 150L

T₁ =  10°C = 283 K

V₂ = ?

T₂ = -8°C = 265 K

V₁/T₁ =V₂/T₂

V₂ = V₁T₂/T₁

     = 150 × 265 / 283

    = 140.46 L

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The coefficient of fe(oh)2 in the balanced redox equation is 2.

What is redox reaction?

Any chemical reaction in which a participating chemical species' oxidation number changes is known as an oxidation-reduction reaction, often known as a redox reaction.

\(BrO- + H2O + 2e- > Br- + 2OH-\)

\(Fe(OH)2 + OH- > Fe(OH)3 + e-\)

\(BrO- +H2O + 2Fe(OH)2 = Br- +2Fe(OH)3\)

The way of balancing is as follows

Step 1) divide the equations into two half reactions

oxidation half reaction                reduction half reaction

Fe(OH)2  --> Fe(OH)3                   BrO-  --> Br-

Step 2) balance atoms other than oxygen and hydrogen

Fe(OH)2  --> Fe(OH)3                    BrO-  --> Br-

Step 3) add OH- ions ,where the oxygen atoms are deficient, add the H2O molecules in required number to balance H atoms

 Fe(OH)2 + OH- --> Fe(OH)3            BrO-+H2O --> Br- + 2OH-

Step4) now add required number of electrons to balance the charge. don't forget the number of electrons loss in oxidation half reaction= the number of electrons gain in reduction half reaction

\(2Fe(OH)2 +2OH- -- > 2Fe(OH)3+2e-\)

\(BrO- + H2O +2e--- > Br- + 2OH-\)

Step5) now add the both half reactions ,re write

BrO- +H2O + 2Fe(OH)2 = Br- +2Fe(OH)3.

Therefore, the coefficient of fe(oh)2 in the balanced redox equation is 2.

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Answer:

a) AlCl3 + 3H2O -> Al(OH)3 + 3HCl

Explanation:

A good strategy is to give the most complicated molecule a coefficient of 1 and trace the individual elements to the other side of the reaction. In this case I gave Al(OH)3 a coefficient of 1 which is the same as writing the molecule normally. Then following the first element Al to the other side where its used once in AlCl3, so I gave that a coefficient of 1 because there's only one Al atom in the molecule. Next I focused on the Cl in AlCl3 and looked for other Cl in the reaction, noticing that there is one other instance of Cl present in HCl on the right side of the reaction. I then gave HCl a coefficient of 3 to balance the Cl leaving the final unbalanced molecule H2O, Al(OH)3 contains three H and 3HCl contains another three H making the total H on the right side 6. Since H2O is the only molecule on the left side containing H it's coefficient must be 3.

Answer:organelle 1

Explanation:

Organulo 1 is the organelle that  stores the information that determines an individual blood type. The correct option is option A.

A tiny cellular component known as an organelle serves a specialised purpose within a cell. The cytoplasm of prokaryotic and eukaryotic cells contains organelles. Organelles are frequently encased by a separate membrane in eukaryotic cells because they are more complicated.

Similar to the internal organs of the body, organelles are specialised and carry out important tasks required for proper cellular function. Organelles are responsible for a variety of tasks, such as powering a cell's energy needs and regulating its development and reproduction. Organulo 1 is the organelle that  stores the information that determines an individual blood type.

Therefore, Organulo 1 is the organelle that  stores the information that determines an individual blood type. The correct option is option A.

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Your question is incomplete but most probably your full question was,  

Answer:

4. 01 × 1022 molecules 6. 02 × 1023 molecules 9. 03 × 1024 molecules 2. 89 × 1026 molecules.

Explanation:A gas cylinder contains exactly 1 mole of oxygen gas (O2). How many molecules of oxygen are in the cylinder?

Answer:

B or u can say 6.02 × 1023 molecules

Explanation:A gas cylinder contains exactly 1 mole of oxygen gas (O2). How many molecules of oxygen are in the cylinder?

The partial pressure of oxygen in his lungs will be 108 kPa.

The correct option is C.

The partial pressure of oxygen is 21.39 kPa. The correct option is B.

The number of moles of oxygen that you take in is 4.845 moles.

The pressure of oxygen in the lungs of the diver is calculated below:

The Pressure of oxygen = 21 % * 512 kPa

The Pressure of oxygen = 108 kPa.

The partial pressure of oxygen = Total pressure -  partial pressure of water vapor

The partial pressure of oxygen = 22 kPa - 0.61 kPa

The partial pressure of oxygen = 21.39 kPa

The number of moles of oxygen taken in, n = PV/RT

n = 1000 * 12 / 8.31 * 298

n = 4.845 moles

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Answer:

108 kPa.

Explanation:

Answer:

Naturally occurring

Explanation:

please mark me brainliest

Answer:

Streak

Explanation:

Streak is the microscopic remains of minerals in powder form after being rubbed with porcelain plates. The streaks do not have orderly arranged lattice structure or unit cells.

They are randomly arranged and microscopic size powders. The streak of minerals cannot be distinguished easily as it mostly appears similar for all minerals.

Thus, among the given options streak is one in the property of minerals. We can rely upon streaks as it cannot be easily affected by impurities.

Answer:

There are actually five, and there's an easy way to remember them.

Physical Description

Action

Inner thoughts

Reactions

Speech

P.A.I.R.S

This will basically help you with any story you come up with

Answer:

Molecular genetics emerged from the realization that DNA and RNA constitute the genetic material of all living organisms. (1) DNA, located in the cell nucleus, is made up of nucleotides that contain the bases adenine (A), thymine (T), guanine (G), and cytosine (C).

The pH of the solution is 4.76.

To calculate the pH of this solution, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where pKa is the dissociation constant for acetic acid (1.8 x 10-5), [A-] is the concentration of the acetate ion, and [HA] is the concentration of undissociated acetic acid.

First, we need to find the concentration of acetate ion and undissociated acetic acid after mixing the two solutions. To do this, we use the formula:

n1V1 = n2V2

where n is the number of moles of the solute and V is the volume of the solution.

For acetic acid:

n1 = 0.14 M x 10 mL / 1000 mL = 0.0014 moles

n2 = n1 = 0.0014 moles (since no reaction occurs between the two solutions)

V2 = 10 mL + 20 mL = 30 mL

V1 = n2V2 / n1 = 0.0014 moles x 30 mL / 0.14 M x 1000 mL = 0.03 moles

So the concentration of undissociated acetic acid is:

[HA] = n1 / V1 = 0.0014 moles / 0.03 L = 0.0467 M

For sodium acetate:

n1 = 0.1 M x 20 mL / 1000 mL = 0.002 moles

n2 = n1 = 0.002 moles (since no reaction occurs between the two solutions)

V2 = 10 mL + 20 mL = 30 mL

V1 = n2V2 / n1 = 0.002 moles x 30 mL / 0.1 M x 1000 mL = 0.06 moles

So the concentration of acetate ion is:

[A-] = n1 / V1 = 0.002 moles / 0.06 L = 0.0333 M

Now we can plug these values into the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

pH = -log(1.8 x 10-5) + log(0.0333/0.0467)

pH = 4.76

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The pKa of the weak acid HA is approximately 4.875.

The Henderson-Hasselbalch equation is a formula that relates the pH of a solution to the dissociation constant (pKa) of a weak acid and the ratio of the concentrations of the conjugate acid and base. The Henderson-Hasselbalch equation relates the pH of a solution to the pKa of an acid and the ratio of its conjugate base and acid forms:

pH = pKa + log([A-]/[HA])

In this case, we have:

pH = 4.73

[A-]/[HA] = 0.655/0.915 = 0.716

Solving for pKa, we get:

pKa = pH - log([A-]/[HA])

pKa = 4.73 - log(0.716)

pKa = 4.73 + 0.145

pKa = 4.875

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The plates which borders the great philippine plate are the:

It follows that all the plates which have the sea Philippines plates bordered have one thing in common. They are all defined by means of convergent boundaries. In order words, the Pacific, Sunda and Eurasia plates border the philippine plate are produced by different plates which are converging towards each other in several directions.

In conclusion, we can now know that one of the major plates which borders the sea philippines plate is the Pacific plates.

Complete question:

Which plates borders the philippine plate?

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Answer:

A. hibernation

Answer:

Hibernation.

Explanation:

The total pressure of the jar is 0.83 atm.

To find the total pressure of the jar, we need to add up the individual pressures of each gas. Using the ideal gas law, PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin, we can solve for the number of moles of each gas present in the jar.
First, we need to convert the pressures from atmospheres to units of Pascals (Pa), since the gas constant R is in units of J/(mol*K) and 1 atm = 101325 Pa.
Pressure of nitrogen = 0.109 atm = 10900 Pa
Pressure of oxygen = 0.203 atm = 20300 Pa
Pressure of carbon dioxide = 0.060 atm = 6000 Pa
Pressure of argon = 0.458 atm = 45800 Pa

For nitrogen:
n_N2 = (10900 Pa)(V)/(8.314 J/(mol*K))(T) * (1 mol N2)/(28.01 g N2)
For oxygen:
n_O2 = (20300 Pa)(V)/(8.314 J/(mol*K))(T) * (1 mol O2)/(32.00 g O2)
For carbon dioxide:
n_CO2 = (6000 Pa)(V)/(8.314 J/(mol*K))(T) * (1 mol CO2)/(44.01 g CO2)
For argon:
n_Ar = (45800 Pa)(V)/(8.314 J/(mol*K))(T) * (1 mol Ar)/(39.95 g Ar)
Adding up the four equations gives:
n_total = (10900V/RT)(1/28.01) + (20300V/RT)(1/32.00) + (6000V/RT)(1/44.01) + (45800V/RT)(1/39.95)
Now, we can use Dalton's law of partial pressures, which states that the total pressure of a mixture of gases is the sum of the partial pressures of each gas. In other words:
P_total = P_N2 + P_O2 + P_CO2 + P_Ar
We can substitute the ideal gas law expression for each partial pressure:
P_total = (n_N2RT/V) + (n_O2RT/V) + (n_CO2RT/V) + (n_ArRT/V)
Substituting in the expressions for n_total and simplifying:
P_total = [(10900/28.01) + (20300/32.00) + (6000/44.01) + (45800/39.95)](RT/V)
Finally, we can convert the pressure back into units of atmospheres by dividing by 101325 Pa/atm:
P_total = [(10900/28.01) + (20300/32.00) + (6000/44.01) + (45800/39.95)](RT/V) / 101325 atm/Pa
Plugging in the values of R (0.08206 L*atm/(mol*K)), T (assumed to be room temperature, 298 K), and V (assumed to be 1 liter) gives:
P_total = [(0.109/28.01) + (0.203/32.00) + (0.060/44.01) + (0.458/39.95)](0.08206*298/1) / 101325
Simplifying:
P_total = 0.83 atm

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