What mass (in grams) of aspirin (C₉H₈O₄) is produced from 57.6 g of C₇H₆O₃ assuming 95.0% yield from the reaction below?
C₇H₆O₃ (s) + C₄H₆O₃ (s) → C₉H₈O₄ (s) + HC₂H₃O₂ (aq).

Jeremiah can arrange the materials in the following way to create a model that shows the processes by which water is cycled from a lake into the atmosphere and back to the lake

The following can be a representation of the water cycle;

Fill the glass jar with water to resemble the lake.

Put the lamp next to the jar to symbolize the sun.

Wrap the jar in plastic sheet to imitate the atmosphere.

Turn on the bulb to represent the sun warming the water.

When the water in the jar warms up and evaporates into water vapor, moisture will condense on the plastic wrap.

The water vapor will ascend and collect on the plastic wrap to represent the water vapor rising into the atmosphere.

Water vapor cools as it rises and condenses back into liquid form, as shown by the water droplets gathering on the plastic wrap.

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Answer:

heat energy

Explanation:

Conduction is the transfer of heat energy from one substance to another or within a substance.

Answer: 0.4g per 1 cm3

Explanation:

5.0 × 3.0 × 7.0 = 105 cm3 this is the volume of cube

density is mass per unit of volume

d = m / V then 42g / 105 cm3 = 0.4 g/ 1 cm3

Explanation:

The first step of the Hydrogen fusion process: a nucleus of Deuterium (2H) is formed from two protons with the emission of an antielectron and a neutrino. The basic Hydrogen fusion cycle involves four Hydrogen nuclei (protons) and two electrons and yields a Helium nucleus, two neutrinos and six photons.

Answer:

C just took it

Explanation:

Ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)) mixture could be a useful buffer in a solution. Option C

A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer system works by the principle of Le Chatelier's principle, where the equilibrium is shifted to counteract the changes caused by the addition of an acid or a base.

In option A, acetic acid (\(CH_3CO_2H\)) is a weak acid, but hydrochloric acid (HCl) is a strong acid. This combination does not form a buffer because HCl is completely dissociated in water and cannot provide a significant concentration of its conjugate base.

Option B consists of sodium hydroxide (NaOH), which is a strong base, and elemental sodium (Na), which is a metal. This combination does not form a buffer as there is no weak acid-base pair involved.

Option D contains acetic acid (\(CH_3CO_2H\)), a weak acid, and ammonia (\(NH_3\)), a weak base. Although they are weak acid and base, they do not form a buffer system together as they are both weak acids or bases and lack the required conjugate acid-base pair.

Option C, ammonia (\(NH_3\)), is a weak base, and ammonium chloride (\(NH_4Cl\)) is its conjugate acid. This combination can form a buffer system. When ammonia reacts with water, it forms ammonium ions (NH4+) and hydroxide ions (OH-).

The ammonium ions act as the weak acid, while the ammonia acts as the weak base. The addition of a small amount of acid will be counteracted by the ammonium ions, and the addition of a small amount of base will be counteracted by the ammonia, thus maintaining the pH of the solution relatively stable.

Therefore, option C, consisting of ammonia (\(NH_3\)) and ammonium chloride (\(NH_4Cl\)), is the suitable mixture that could be a useful buffer in a solution.

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The Sun-Earth-Moon system is important because it sustains life on Earth, regulates Earth's climate, and influences natural phenomena like tides.

The Sun-Earth-Moon system plays a vital role in supporting and sustaining life on Earth. The Sun is the primary source of energy for our planet, providing heat and light necessary for photosynthesis, the process by which plants convert sunlight into food and oxygen. Sunlight is also crucial for maintaining Earth's temperature and driving weather patterns.

The Moon, as Earth's only natural satellite, contributes to several essential functions. Its gravitational pull creates the tides, which influence coastal ecosystems and shape coastal landscapes.

The Moon's orbit also stabilizes Earth's axial tilt, providing a stable climate for life to thrive. Additionally, the Moon's phases have cultural and historical significance, influencing human activities such as agriculture, navigation, and calendar systems.

The Sun-Earth-Moon system's interactions are responsible for natural phenomena like eclipses, both solar and lunar, which have fascinated humans throughout history and continue to be important for scientific study and exploration.

Understanding these celestial events enhances our knowledge of astrophysics and helps us comprehend the vastness and complexity of the universe.

Furthermore, the study of the Sun-Earth-Moon system provides insights into celestial mechanics, orbital dynamics, and the broader field of planetary science. By examining the interplay between these celestial bodies, scientists can gain a deeper understanding of Earth's place in the universe and explore potential habitable conditions on other celestial bodies.

Overall, the Sun-Earth-Moon system is of immense importance as it sustains life, regulates climate, influences natural phenomena, and provides a platform for scientific exploration and discovery.

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Answer:

30

Explanation:

10+10+10 =30

..,,.............. . .... . .

Answer:

A mixture of ethane and ethene occupies 40 litre at 1.00 atm and at 400 K.The mixture reacts completely with 130 g of O2 to produce CO2 and H2O . Assuming ...

Missing: 32 ‎Br2

Answer:

CH

Explanation:

CH, a typical sample of the compound contains one atom of carbon (C) to one atom of hydrogen (H).

molar mass of empirical formula = (20 x 12.01 g/mol) + (24 x 1.01 g/mol) + (1 x 14.01 g/mol) = 324.44 g/mol ratio = 324.44 g/mol / 324 g/mol = 1.001. The molecular formula of quinine is C20H24N.

The active component of cinchona extracts, which have been used for this purpose since before 1633, is utilized as an antimalarial medication. Quinine has been utilized in conventional cold remedies for its use as a mild antipyretic and analgesic.

Plasmodium falciparum malaria is treated with quinine. Malaria is brought on by the parasite Plasmodium falciparum, which enters the body through the red blood cells. Quinine functions by either eliminating the parasite or halting its growth.

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The volume of air you might inhale (and exhale) in 8.00 hours is approximately 1903.2 liters.

To calculate the volume of air you might inhale (and exhale) in 8.00 hours, we need to determine the total number of breaths you take in that time and then multiply it by the volume of each breath.

First, let's calculate the number of breaths in 8.00 hours:

Number of breaths per minute = 13

Number of breaths per hour = 13 breaths/minute * 60 minutes/hour = 780 breaths/hour

Number of breaths in 8.00 hours = 780 breaths/hour * 8.00 hours = 6240 breaths

Now, let's calculate the volume of air in liters:

Volume of each breath = 0.305 liters

Volume of air inhaled and exhaled in 8.00 hours = Volume of each breath * Number of breaths in 8.00 hours

Volume of air inhaled and exhaled in 8.00 hours = 0.305 liters/breath * 6240 breaths = 1903.2 liters

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At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

An ideal gas is one that follows the gas laws at all conditions of temperature and pressure. To do so, the gas would need to completely abide by the kinetic-molecular theory. On the other hand, a real gas is a gas that does not behave according to the assumptions of the kinetic-molecular theory.

Furthermore, the particles of an ideal gas are extremely small and have a mass equivalent to practically zero. Ideal gas particles also have no volume.

An example of a real gas is helium, oxygen, and nitrogen.

Answer:

valence electrons

that is the number of electrons present in the last shell of the atom of the element

Hope it helps yuh

The pathway is likely shut down then the level of isoleucine is high, and active when the level of isoleucine is low.

Isoleucine serves as an allosteric inhibitor of the first enzyme in the pathway that converts threonine to isoleucine. This means that when the level of isoleucine is high, it binds to the first enzyme and inhibits its activity, effectively shutting down the pathway.

When the level of isoleucine is low, the enzyme is not inhibited and the pathway is active. This type of regulation helps to prevent the pathway from overproducing isoleucine and instead balances its production based on the cell's needs.

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Fe or iron is 26th element. Thus it contains 26 electrons in total which is filled in different energy levels. There are 8 electrons in the valence shell of iron and 18 electrons are inner shell called core electrons.

Valence electrons are electrons located in the outermost orbital of the atom. They are highly active and experience  less attractive pull from the nucleus compared to the inner electrons.

The outer electrons or valence electrons are thus participating in bonding and they will be shared with other atoms or lost to other atoms.

Iron, Fe is a transition metal placed in the d-block of the periodic table. Its atomic number is 26 and it possess 26 electrons and 26 protons. All elements in the d-block have their outermost shell d and the last electrons are placed in the d-shell.

The valence shell of iron is 4s and 3d. 6 electrons are located in d-orbital and 2 electrons in 4s orbital . Thus, total 8 electrons are there in the outermost orbitals and they are called valence electrons of iron. Remaining 18 electrons are called core electrons.

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Answer:

18 core electrons

8 valence electrons

Explanation: Edge 2023

Answer:

Lepord would win.

Explanation:

The Wildbeast is just another goat/sheep so its like a lepord fighting one of them so the Lepord would win.

Answer:

flo-non metal

germ- metalloid

zinc - metal

phos- non metal

lithium- metal

Explanation:

Elements present in group 18 are known as noble gases. The outermost shell of these elements are completely filled.

Hence, they have low reactivity towards any kind of chemical reaction.

Elements of noble gas family are helium, neon, argon, krypton, xenon, and radon.

Thus, we can conclude that family of noble gases in the periodic table is least likely to enter into chemical reactions.

Answer:

Noble gases are considerded non reactable gases, because they're reluctant to share electrons from their filled outer electron shells. Hence, the are the least likely to enter into chemical reactions.

The compound that acts as the precipitate in this reaction is Pbl₂, or lead(II) iodide.

In the given reaction equation:

KI + Pb(NO3)2 → KNO3 + Pbl₂

The precipitate formed is Pbl₂, which is lead(II) iodide. In the reaction, potassium iodide (KI) reacts with lead(II) nitrate (Pb(NO3)2) to form potassium nitrate (KNO3) and lead(II) iodide (Pbl₂).

Lead(II) iodide is insoluble in water, as mentioned in the statement. When the two chemicals are mixed, lead(II) iodide is formed as a solid precipitate, which appears as a golden substance, as described.

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Semi-permeable membrane divides two aqueous solutions, A and B. Solution A's osmotic pressure starts to drop right away. which of the following is true: Solution B's initial osmotic pressure is higher than Solution A's.

When liquid water serves as the solvent, the result is an aqueous solution. That is, water molecules encircle and integrate solution (disintegrated) ions and molecules into the web of bonds in the water. After that, the dissolved species dispersed throughout the water. Water with one or even more dissolved substances is known as an aqueous solution. An aqueous solution can contain dissolved gases, particles, or other liquids. A mixture needs to be stable to qualify as a real solution.

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Answer:

\(\Delta _f H=-81.1\frac{kJ}{mol}\)

Explanation:

Hello!

In this case, since the enthalpy of formation of ethane at 298 K is about -84 kJ/mol, via the Kirkoff's law, we can compute it a 350 K as shown below:

\(\Delta _f H=\Delta _f H\° +\int\limits^{350K}_{298K} {14.73+0.1272T} \, dx\)

It means we can integrate to get:

\(\Delta _f H=\Delta _f H\° +14.73\frac{J}{mol*K} (350K-298K)+\frac{0.1272}{2}\frac{J}{mol*K^2} (350K^2-298K^2)\)

Now, we can plug in the enthalpy of formation in consistent units to obtain:

\(\Delta _f H=-84,000\frac{J}{mol} +14.73\frac{J}{mol*K} (350K-298K)+\frac{0.1272}{2}\frac{J}{mol*K^2} (350K^2-298K^2)\\\\\Delta _f H=-81,091\frac{J}{mol}\\\\\Delta _f H=-81.1\frac{kJ}{mol}\)

Best regards!

Answer:

Beryllium

Explanation:

We have that the  the molarity of methanol in the solution is mathematically given as

Morality=7.91mol/l

Question Parameters:

An aqueous solution of methanol (MM = 32.04 g/mol)

A molality of 8.83 m and a density of 1.15 g/mL.

Generally the equation for the   is mathematically given as

\(Morality=\frac{moles of solute }{mass of the solvent}\)

where

Mass of solution=(100+282.2)

Mass of solution=1289.9

Volume=1289.9/1.15

Volume=1.115L

Therefore

\(Morality=\frac{moles of solute }{mass of the solvent}\)

Morality=8.83/1.115

Morality=7.91mol/l

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Answer:

Tyrel is learning about a certain kind of metal used to make satellites. He learns that infrared light is absorbed by the metal. X-ray light is transmitted through the metal. ... Yes, light can cause the metal to get warm because light carries energy.

The estimated age of the rock is 1.408 billion years, based on the fact that about 3% of the original uranium-235 remains in the rock.

The half-life of uranium-235 is 704 million years. This means that after 704 million years, half of the original uranium-235 in a rock will have turned into lead.

If tests show that only about 3% of the original uranium-235 remains in the rock, then approximately 97% of the original uranium-235 has turned into lead. This means that there has been 2 half-lives of decay (since 2 half-lives is approximately equal to 97%).

To estimate the age of the rock, we can multiply the half-life of uranium-235 by the number of half-lives that have occurred. In this case, the age of the rock can be estimated as:

Age of rock = 2 x 704 million years

Age of rock = 1.408 billion years

Therefore, the estimated age of the rock is 1.408 billion years, based on the fact that about 3% of the original uranium-235 remains in the rock.

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Answer:

its D

Explanation:

Answer:

D

Explanation: