How is a comet different from a star?

Answer:

Instead, pour a small amount into a beaker or clean weigh dish. Once you have added a chemical to a container, label it promptly. When you are finished with the experiment, dispose of the excess chemical as chemical waste. Do not simply pour the excess chemical down the sink.

The entropy  is -3.65 and -0.049 J per kelvin per mole respectively are the entropy of an insulated tank.

Entropy is a measure of randomness in a system. It is a state function. It can be denoted by heat supplied for a reversible system per temperature.

The final pressure will be the partial pressure of each gas in the mixture.

a) Partial pressure of nitrogen = mole fraction of nitrogen x total pressure = (0.79 mol) × (1 + 1 bar)/(0.79 + 0.29 mol) = 1.46 bar

Partial pressure of oxygen = mole fraction of oxygen x total pressure = (0.29 mol) ×(1 + 1 bar)/(0.79 + 0.29 mol) = 0.54 bar

Therefore,

ΔS of nitrogen= -R ln1.46 = -0. 38R

∆S of oxygen= -R ln 0.54= -0. 61R

ΔSuniv=−(0.79mol/0.79+0.29mol)×0.38 R−(0.29mol/0.79+0.29mol)×0.61

R=−0.27 R−0.16

R=−0.44

R=−3.65JK−1mol−1

(b) Partial pressure of nitrogen = mole fraction of nitrogen x total pressure = (0.79 mol) × (2 + 1 bar)/(0.79 + 0.29 mol) = 2.19 bar

Partial pressure of oxygen = mole fraction of oxygen x total pressure = (0.29 mol) × (2 + 1 bar)/(0.79 + 0.29 mol) = 0.80 bar

ΔS of nitrogen gas=−Rln1.46=−0.09R

ΔSof sulphur oxide =−Rln0.54=0.22R

ΔSuniv=−(0.79mol/0.79+0.29mol)×0.09R+(0.29mol/0.79+0.29mol)×0.22

R=−0.066 R+0.060

R=−0.049JK−1mol−1

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Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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The depiction of valence electrons around the symbol of an element is called the electron dot or Lewis dot structure.

It shows the symbol of the element in the center, surrounded by dots representing the valence electrons of the atom. The number of dots represents the number of valence electrons, which are the outermost electrons of an atom that participate in chemical reactions.

The electron dot structure can be used to predict the bonding and reactivity of atoms in molecules and compounds.

Therefore , the depiction of valence electrons around the symbol of an element is called the electron dot or Lewis dot structure.

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Answer:

the original concentration of A = 0.0817092  M

Explanation:

A reaction is considered to be of first order it it strictly obeys the graphical equation method.

\(k_1 = \dfrac{2.303}{t}log \dfrac{a}{a-x}\)

where;

k = the specific rate coefficient  = 3.4 × 10⁻⁴ s⁻¹

t = time   = 5.0 h = 5.0 × 3600 = 18000 seconds

a = initial concentration = ???

a - x = remaining concentration of initial concentration at time t = 0.00018 mol L⁻¹

\(3.4 \times 10^{-4}= \dfrac{2.303}{18000}log \dfrac{a}{0.00018}\)

\(3.4 \times 10^{-4}= 1.27944 \times 10^{-4} \times log \dfrac{a}{0.00018}\)

\(\dfrac{3.4 \times 10^{-4}}{1.27944 \times 10^{-4}}= log \dfrac{a}{0.00018}\)

\(2.657= log \dfrac{a}{0.00018}\)

\(10^{2.657}= \dfrac{a}{0.00018}\)

\(453.94 = \dfrac{a}{0.00018}\)

\(a =453.94 \times 0.00018\)

a = 0.0817092  M

Thus , the original concentration of A = 0.0817092  M

Answer: ferrous salts

Explanation:

done

Explanation:

First, we need to know that Calcium oxide is:

CaO.

Molar mass of it is:

Ca = 40 g/mol

O = 16 g/mol

CaO = 56 g/mol

To discover the number in moles of 5.45 g of CaO we just need to use the following formula:

n = m/MM

m = 5.45

MM = 56 g/mol

n = 5.45/56

n = 0.09732 moles

Answer:

0.09732 moles

Answer:

0.25

Explanation:

volume= number of moles over concentration

hence v=1.5/6

Answer:

The HAVING clause is used to restrict the groups that will be included in a query result.

Explanation:

The HAVING clause is used in SQL to filter groups based on aggregate functions. It is typically used in conjunction with the GROUP BY clause, which is used to group rows in a table based on one or more columns. The HAVING clause allows you to further filter the groups based on a condition that is evaluated using aggregate functions such as COUNT, SUM, AVG, etc.

The HAVING clause is executed after the GROUP BY clause and before the SELECT clause. It allows you to filter groups based on aggregate functions, and is used in combination with GROUP BY to filter out groups that do not meet certain criteria, or when you want to compare the values of different aggregate functions within the same query.

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The mass of the octane will be burned in order to release the 5340kJ of energy and the  ΔH value is -5471kJ/mol is 110.83 g.

The heat energy = 5340kJ

The ΔH value = -5471kJ/mol

The moles of the octane = 5340 / 5471

The moles of the octane = 0.97 moles of the octane

The number of the moles =  mass / Molar mass

The Mass of the octane =  Moles × M.mass

The Mass of the octane =  0.970 mol × 114.23 g/mol

The Mass of the octane =  110.83 g of Octane

Thus, the mass of the octane is 110.83 g and release the 5340kJ of energy with the ΔH value is -5471kJ/mol.

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The number of moles of nitrogen gas in the cylinder is calculated by dividing the product of pressure, volume, and temperature by the ideal gas constant.

To determine the number of moles of nitrogen gas in the cylinder, we can use the ideal gas law equation:

PV = nRT

Where:

P = pressure in atmospheres

V = volume in liters

n = number of moles

R = ideal gas constant (0.0821 L·atm/(mol·K))

T = temperature in Kelvin

First, we need to convert the given pressure from inches of mercury (inHg) to atmospheres (atm). Using the conversion factor 1 inHg = 0.0334211 atm, we find:

P = 93.0 inHg * 0.0334211 atm/inHg = 3.10877 atm

Next, we need to convert the given temperature from Celsius to Kelvin. Adding 273.15 to the Celsius temperature, we have:

T = 15.00°C + 273.15 = 288.15 K

Now we can rearrange the ideal gas law equation to solve for the number of moles (n):

n = PV / RT

n = (3.10877 atm) * (9.400 L) / (0.0821 L·atm/(mol·K) * 288.15 K)

Calculating this expression will give us the number of moles of nitrogen gas in the cylinder.

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It is the name given to the combination of strong and weak nuclear forces.

We know that the nucleus of the atom is the place that houses the greatest amount of energy. We could obtain the highest energy by ripping open the nucleus of an atom. There is a huge energy that holds the particles in the nucleus together and this called the nuclear binding energy.

This energy must also be required to break the nucleus as is the case in the operation of the atomic bond and in nuclear reactors. The true statement about the nuclear energy is that; It is the name given to the combination of strong and weak nuclear forces.

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Answer:

you have to answer about what Emmy Noether was known for and how she accomplished her goal! For example Dr. Martin Luther King was known for his peaceful protests and his famous "I Have a Dream". He accomplished this goal by never giving up and sticking to his morals! I hope this helped!! ♡♡ (BTW love your profile picture)

Answer:

19-24 cm

Explanation:

Answer:

the answer is 19-24 cm

Explanation:

i did the study island

Answer

b. It produces carbon dioxide when burned in pure oxygen.

Explanation

The reaction between diamond and oxygen, producing carbon dioxide is not a physical property of diamond, it is a chemical property because breaking and synthesis of chemical bonds occur.

Answer:

give dat hooman a brainliest!!

Explanation:

Answer:

B C and D

Explanation:

Omg

Answer:

The balance equation of Ca(OH)2 + HCl ---> CaCl2 + H2O​

is

Ca(OH)2(s) + 2HCl(aq) ---> CaCl2(aq) +2H2O​ (l) (balanced equation)

Grizzly bears are omnivores, meaning that they consume both plant and animal matter. This study, which analyzed nitrogen content in bear fur samples, indicates that bears that consume more animal matter have a higher nitrogen content in their diet and are therefore more active.

Nitrogen is an essential nutrient for building proteins and is found in higher amounts in animal matter compared to plant matter. Therefore, bears that consume more animal matter may have more energy and be more active.
Hi! Based on your question, it seems that you want to know which type of food, when consumed by grizzly bears, leads to higher activity levels, as indicated by nitrogen content in their fur samples. Grizzly bears are omnivores, meaning they eat both plants and animals. Nitrogen content in their fur samples can be used as an indicator of the bear's diet. Typically, higher nitrogen content is associated with a diet richer in animal protein. Therefore, we can conclude that grizzly bears consuming more animal protein are more active.

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Grizzly bears are omnivores. this data (taken from bear fur samples to determine nitrogen content in their diet)x indicates that bears that consume ___ are more active

Grizzly bears are omnivores, which means that they consume both plants and animals. The data taken from bear fur samples to determine nitrogen content in their diet indicates that bears that consume more animal protein are more active. Animal protein provides bears with the necessary energy and nutrients to support their active lifestyles, including hunting, scavenging, and defending their territories.

However, it is important to note that the amount of animal protein consumed by grizzly bears varies depending on factors such as season, location, and availability of food sources.

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\(\\ \sf\longmapsto Mass\%=\dfrac{Mass\;of\:solute}{Mass\:of\:solvent}\times 100\)

\(\\ \sf\longmapsto Mass\%=\dfrac{35}{250}\times 100\)

\(\\ \sf\longmapsto Mass\%=\dfrac{7}{50}\times 100\)

\(\\ \sf\longmapsto Mass\%=7(2)=14\%\)

Answer:

PV= n RT

4.3×y = 5×277

4.3y =1385

4.3y÷ 4.3y = 1385 ÷ 4.3y

y = 322

The molar concentration of HCl is 0.678 M.

The balanced equation for the reaction is:

NaHCO₃ (aq) + HCl(aq) → H₂CO₃(aq) + NaCl(aq)

We can see that one mole of HCl reacts with one mole of NaHCO₃. Therefore, the number of moles of HCl present in the solution can be calculated as follows:

0.95 mol/L × 25.7 mL = 0.0244 mol

This is the number of moles of HCl used in the reaction. Since the reaction was carried out on a 36 mL sample of HCl, the molar concentration can be calculated as follows:

Molarity = Moles / Volume

Molarity = 0.0244 mol / 0.036 L

Molarity = 0.678 M

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The calculated activation energy is Ea/ ⁸°³¹⁴ₓ²⁹⁸ = 0.220

Every molecule has a specific quantity of energy at a minimum. However, if the molecules collide with enough kinetic energy and in the right collision orientation to overcome the minimum energy barrier, a reaction will take place. The activation energy, Ea, is the minimal amount of energy needed for a chemical reaction to take place.

The Arrhenius equation, k=Ae-Ea/RT, can be used to calculate the rate constant.

k being the rate constant

Frequency factor = A

R = Gas constant, where Ea = Activation energy

T = Absolute Temperature, where

1.5x10⁻² =6.87x 10⁻²s⁻¹x e⁻ (Ea / 8.314 J/(mol K) x 298 K)

0.220  = Ea / 8.314 x 298  

Ea/ ⁸°³¹⁴ₓ²⁹⁸ = 0.220

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The Balanced Chemical Equation is: Na2SO3(aq)+2HCl(aq)→H2SO3(aq)+2NaCl(aq)

What is an Equivalent point?

In an acid-base reaction, the equivalence point is when chemically equal amounts of acid and base are mixed. This is a general reaction pathway that produces a specific acid/base or salt from a mixture of other acids and bases.

This is a mixed acid-base reaction up to the equivalence point.

Aqueous Sulfurous Acid: H2SO3(aq)

Aqueous Hydrochloric Acid: NaCl(aq)

Aqueous Sodium Sulfite: Na2SO3(aq)

Aqueous Hydrochloric Acid: HCl(aq)

Therefore, the balanced formula is:

Na2SO3(aq)+2HCl(aq)→H2SO3(aq)+2NaCl(aq)

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Answer:

b

Explanation:

STEP 1: To solve this question, we must first find the number of moles in a 13g solution of NaNO3 (molar mass = 85g/mol):

moles of NaNO3 = mass / molar mass

moles of NaNO3 = (13g) / (85g/mol)

STEP 2: The ratios of the compound are 3 moles of oxygen, 1 mole of sodium, and 1 mole of nitrogen. As such, for every 1 mole of NaNO3, there are 3 moles of oxygen, and the answer is:

moles of oxygen = (3) x (13/85)

Molar mass can be defined as 'mass per mole.' In other words, molar mass is the sum of the mass of all the atoms found in one mole's worth of a substance. It is expressed in units of grams per mole.

Molar mass is depicted for elements or molecules. In the case of single elements or individual atoms, the molar mass would just be the element's mass expressed in atomic mass units. In other words, the atomic mass and the molar mass of an individual atom are exactly equal.

When individual atoms are bonded to form a molecule, the molar mass represents the mass of all the atoms. Molar mass is different from molecular mass in that molecular mass is the mass of a given molecule, whereas molar mass is the mass of one mole of the given molecule.

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Answer:

The water cycle or hydrologic is a continuous cycle where water evaporates, travels into the air and becomes part of a cloud, falls down to earth as precipitation, and then evaporates again. ... These areas are usually close to oceans or large bodies of water that allow more water to evaporate and form clouds.

Explanation:

Answer: A phylogenetic tree is an evolutionary tree that shows the evolutionary relationships between different groups of animals, Cladograms give a hypothetical picture of the actual evolutionary history of the organisms

Explanation: Hope this helps you out :)

The true statements from the list below is c. Zinc metal is the best reducing agent studied in this experiment and e. tin metal will reduce Cu² to copper metal Zn² is the best oxidizing agent studied in this experiment

This is because it has a strong ability to lose electrons and form Zn²+ ions. Tin metal will reduce Cu²+ to copper metal, indicating that tin is a better reducing agent than copper. Cu²+ is the best oxidizing agent studied in this experiment, as it readily gains electrons to form copper metal. In contrast, copper metal will not reduce H+ to hydrogen gas, since copper has a lower reduction potential than hydrogen.

The cell potential for a cell consisting of tin metal immersed in a tin(II) solution and the standard hydrogen electrode is not known because it was not measured in this experiment. It is important to measure cell potential in order to determine the relative reducing and oxidizing capabilities of different elements. The true statements from the list below is c. Zinc metal is the best reducing agent studied in this experiment and e. tin metal will reduce Cu² to copper metal Zn² is the best oxidizing agent studied in this experiment

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