how long does it take for stirring and heat to dissolve in water?

Temperature is 273 Kelvin and pressure is 1 bar.

Given - 10 mol of gas at STP

Temperature = ?

Pressure = ?

STP -  STP or Standard Temperature and Pressure, refers to the nominal atmospheric conditions at sea level. 0 degrees Celsius and 1 atmosphere are the respective temperatures and pressures. The STP value is essential for physicists, chemists, engineers, pilots, and navigators in addition to other specialists.

In order to report on the qualities of matter, standard conditions for temperature (T) and pressure (P) relate to a certain temperature and pressure. STP values are frequently applied in gas experiments.

STP was previously defined as follows by the International Union of Pure and Applied Chemistry (IUPAC):

It is 0 degrees Celsius outside (273.15 degrees Kelvin or 32 degrees Fahrenheit)

One atmosphere (101.325 kilopascal or 760 Torr)

This usage of the term has been dropped. However, the definition of the volume (V) term normal cubic meter continues to be often employed under these circumstances. The IUPAC has used a stricter definition of STP since 1982:

Absolute pressure: 105 Pa or 100,000 pascals (1 bar, 14.5 pounds per square inch, 0.98692 atm).

Hence, Temperature is 273 Kelvin and pressure is 1 bar at STP.

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The number of moles of acetylsalicylic acid in each tablet is 1.8 × 10⁻³ mol.Moles of acetylsalicylic acid in each tablet

The number of moles of acetylsalicylic acid in each tablet can be calculated by using the formula mentioned below:

Number of moles = Given mass of substance / Molar mass

Given data:

Mass of acetylsalicylic acid in each tablet = 325 mg

Molar mass of acetylsalicylic acid = 180.15 g/mol (calculated from C9H8O4)

Conversion of mass from milligrams to grams will give the result in mols of acetylsalicylic acid present in each tablet:

Number of moles of acetylsalicylic acid in each tablet = (325 mg)/(1000 mg/g) / 180.15 g/mol

= 1.8×10⁻³ mol (rounded to 3 significant figures)

Hence, the number of moles of acetylsalicylic acid in each tablet is 1.8 × 10⁻³ mol.

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Answer:

they have different mass numbers

Explanation:

The type of chemical reaction that typically forms peptide bonds between amino acids to create a protein is a condensation or dehydration synthesis reaction.

The atoms involved in the formation of a peptide bond are carbon, hydrogen, oxygen, and nitrogen. These atoms combine to create a peptide bond, which links the carboxyl group (-COOH) of one amino acid with the amino group (-NH₂) of another amino acid.
A triglyceride molecule is generally non-polar because it consists of three fatty acid chains attached to a glycerol molecule, and both fatty acids and glycerol are hydrophobic (non-polar) in nature.
Triglycerides are insoluble in water due to their non-polar nature. They do not form hydrogen bonds with water molecules, making them hydrophobic.
Triglycerides store a significant amount of energy. They are the primary storage form of energy in adipose tissue, providing high-energy density due to the long carbon chains in fatty acids.
The energy stored in a triglyceride molecule is higher compared to an amino acid or glucose molecule. Triglycerides have more carbon-hydrogen bonds, which store a higher amount of energy per unit mass than the shorter carbon chains in amino acids or glucose molecules. This is why triglycerides are an efficient energy storage molecule in organisms, as they can be broken down through hydrolysis to release energy when needed.

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Answer:  produce and store energy.

Explanation:

Answer:

Atomic emission spectra are produced when excited electrons return to the ground state. When electrons return to a lower energy level, they emit energy in the form of light.

Explanation:

Answer: 71.76

Explanation:

Answer:

71.76

Explanation:

You plug them in the equation said there

The solubility of KCl at 50 °C is 43.0 g of KCl per 100 g of water. Hence, the mass of the solute is 43.0 g in 100 g of water.

The solution to the problem tells you how much potassium chloride, or KCl, dissolves in 100 grammes of water at 20 degrees Celsius.

Water serves as the solvent in this solution, which contains potassium chloride as the solute. 40 degrees Celsius is the constant temperature. Hence, 36g of solute dissolve in this solution.

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3. (a) Ni electrode can serve as the standard electrode as its reduction potential is zero. It can act a reference standard electrode as the species with reduction potential values more positive to it will get reduced and species with reduction potential values more negative to it will get oxidized. Thus Ni electrode can serve as reference standard electrode.

(b) Cu2+ ion is most easily reduced as it has positive reduction value thus it act as good oxidizing agent by oxidizing other an itself get reduced.

(c) Al metal is most easily oxidized as it has most negative reduction potential value thus it act as good reducing agent by reducing others and itself get oxidized.

(d) Copper and aluminium electrodes are connected to battery to form a spontaneous cell

(i) Al is oxidized as it has negative reduction potential value, thus it loses 3 electrons and form Al3+ ion.

(ii) Al metal act as anode. Because at anode always oxidation takes place. So Al is oxidized to Al3+ at anode.

(iii) At anode: 2 Al (s) 1  2 Al3+ (aq) + 6e-

At cathode: 3 Cu2+ (aq) + 6e- 1  3 Cu (s)  

Net ionic equation: 2 Al (s) +  3 Cu2+ (aq) 1  2 Al3+ (aq) + 3 Cu (s) 

(iv) E0cell = E0cathode - E0anode 

E0cathode = E0Cu2+/ Cu  = 0.62 V                

E0anode = E0Al3+ / Al = -1.38 V

E0cell  = 0.62 V - (-1.38) V = 2 V

As the standard electrode potential of cell is positive, thus the cell reaction is spontanoeus and will proceed in forward direction.

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To determine whether each statement about rain or acid rain is true or false. Please find the evaluation of each statement below:

1. There is more acid rain in the Western vs. Eastern United States.
False. There is more acid rain in the Eastern United States due to higher concentrations of sulfur oxides and nitrogen oxides from industrial activities and power plants.

2. Unpolluted rain water is acidic and approximately 3.6 on the pH scale.
False. Unpolluted rainwater is slightly acidic with a pH of around 5.6. This is due to the natural presence of carbon dioxide in the atmosphere, which dissolves into water and forms carbonic acid.

3. Sulfur oxides and nitrogen oxides in the troposphere cause acid rain.

True. Sulfur oxides (SOx) and nitrogen oxides (NOx) are released from various sources like industrial processes, power plants, and vehicle emissions. These gases react with water, oxygen, and other substances in the troposphere to form sulfuric acid and nitric acid, which then fall to the earth as acid rain.

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Answer:

Law of Conservation Matter

Explanation:

, Calculate Frequency

Example #11: What is the frequency of radiation with a wavelength of 5.00 x 10¯8 m? In what region of the electromagnetic spectrum is this radiation?

Solution:

1) Use λν = c to determine the frequency:

(5.00 x 10¯8 m) (x) = 3.00 x 108 m/s

x = 6.00 x 1015 s¯1

2) Determine the electromagnetic spectrum region:

Consult a convenient reference source.

This frequency is right in the middle of the ultraviolet region of the spectrum.

Problem #12: What is the wavelength of sound waves having a frequency of 256.0 sec¯1 at 20 °C? Speed of sound = 340.0 m/s. (The problem is about sound, but this does not change the basic idea of the equation "wavelength times frequency = speed."

Solution:

a) Use λν = speed:

(x) (256.0 s¯1) = 340.0 m/s

The answer, to four sig figs, is 1.328 m.

Just for kicks: in centimeters, 132.8 cm, and in Ångströms, 1.328 x 1010 Å

Probs 13, 14, 15 here soon

Given Frequency, Calculate Wavelength

Problem #16: Calculate the wavelength of radiation emitted from radioactive cobalt with a frequency of 2.80 x 1020 s¯1. What region of the eletromagnetic spectrum does this lie in?

Solution:

1) Calculate the wavelength:

λν = c

(x) (2.80 x 1020 s¯1) = 3.00 x 108 m/s

x = 1.07 x 10¯12 m

2) Determine the region of the EM spectrum:

Consult a convenient reference source.

Gamma rays.

Problem #17: 1.50 x 1013 Hz? Does this radiation have a longer or shorter wavelength than red light?

Comment: there are a number of ways to answer this question. I'll do two.

Solution #1:

Calculate the frequency of 7000 Å (the longest wavelength of red light):

7000 Å = 7000 x 10¯8 cm = 7.00 x 10¯5 cm (three sig figs is a reasonable assumption)

λν = c

(7.00 x 10¯5 cm) (x) = 3.00 x 1010 cm/s

x = 4.28 x 10¯14 s¯1

A lower frequency (like the value given in the problem) means a longer wavelength. The radiation in the problem has a longer wavelength than the red light I used.

Beyond red on the EM spectrum is infrared.

Solution #2:

Consult a convenient reference source.

Compare 1.50 x 1013 Hz to the various values in the frequency column of the above web site.

Determine that the frequency given in the problem lies in the infrared, a region that has a longer wavelength than red light does.

Problem #18: What color is light whose frequency is 7.39 x 1014 Hertz?

Solution:

The usual manner to solve this problem is to determine the wavelength, then compare the wavelength to a color chart of the electromagnetic spectrum. Here is an example of a color chart. You can find many more on the Internet.

1) Determine wavelength:

λν = c

(x) (7.39 x 1014 s¯1) = 3.00 x 108 m/s

x = 4.065 x 10¯7 m

2) EM color charts usually express the wavelength in nm:

4.065 x 10¯7 m times (109 nm / 1 m)= 406.5 nm

3) When you examine a color chart, you see that the given wavelength is in the violet region.

An alternate method would be to find a color chart which associates frequency values with the colors of the visible spectrum. This type of chart is not as common as a wavelength-based chart, but they can be found. Here is an example.

Using that chart will require that you convert Hz to THz (terahertz).

7.39 x 1014 Hz times ( 1 THz / 1012 Hz) = 739 THz

Problem #19: Calculate the frequency of radiation with a wavelength of 4.92 cm.

Comment: since the wavelength is already in cm, we can use c = 3.00 x 1010 cm s¯1 and not have to do any conversions at all.

Solution:

(4.92 cm) (x) = 3.00 x 1010 cm s¯1

x = 6.10 x 109 s¯1

Problem #20: Calculate the frequency of radiation with a wavelength of 8973 Å.

Comment: since 1 Å = 10¯8 cm, therefore 8973 Å = 8973 x 10¯8 cm. Converting to scientific notation gives 8.973 x 10¯5 cm. This is another place where the cm s¯1 value for c can be used, since Å converts to cm very easily.

Solution:

(8.973 x 10¯5 cm) (x) = 3.00 x 1010 cm s¯1

x = 3.34 x 1014 s¯1

The frequency of the radiation is 6.0 × 10¹⁵ s⁻¹

The radiation is in the Ultra-violet region of the electromagnetic spectrum

From the question,

We are to determine the frequency of radiation with a wavelength of 5.00 × 10⁻⁸ m

From the formula

\(c = \nu \lambda\)

We can write that

\(\nu = \frac{c}{\lambda}\)

Where \(\nu\) is the frequency

\(c\) is the speed of light (\(c = 3.0 \times 10^{8} \ m/s\))

and \(\lambda\) is wavelength

From the given information

\(\lambda = 5.00 \times 10^{-8} \ m\)

∴ \(\nu = \frac{3.0 \times 10^{8} }{5.00 \times 10^{-8} }\)

\(\nu = 6.0 \times 10^{15} \ s^{-1}\)

Hence, the frequency of the radiation is 6.0 × 10¹⁵ s⁻¹

The radiation is in the Ultra-violet region of the electromagnetic spectrum

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Answer:

Mass of ascorbic acid in the pill = 7.152 x 176.1/1000 = 1.26 g

Explanation:  

The mass of ascorbic acid in the pill would be,  

1.26 g  

Now,  

Moles of ascorbic acid = Moles of NaOH = 0.447 M x 16 ml = 7.152 mmol  

Mass of ascorbic acid in the pill = 7.152 x 176.1/1000 = 1.26 g

Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity. Remember that acceleration is a change in velocity. Let’s say an object is moving along a table on earth, suddenly the finite table ends, resulting in the object being present in the air, which means there is no normal contact force N to combat the force by gravity mg, which is why there is an acceleration downwards. This proves as a projectile motion since the direction of motion start changing from horizontal to vertical. Another example is one throwing an object up. It moves up and slows down, reaching its maximum point, leading to it starting to move downwards. This too is a change in motion.

Answer:

pH+3.0 normality

Explanation:

Answer:

The answer is A) the number of individuals in a sea otter population

Diocletian, who ruled from 284-305 AD, is remembered in history for his persecution of Christians, which lasted from 303-311 AD. However, his contributions to the emergence of Christianity as the official religion of the Roman Empire were indirect and unintentional.

Diocletian's reign saw the division of the Roman Empire into two halves, with him ruling the eastern half and his co-emperor Maximian ruling the western half. This division ultimately contributed to the spread of Christianity in the eastern half of the empire, as it allowed for greater freedom of religious expression and fewer restrictions on Christians. Additionally, Diocletian's persecution of Christians led to the martyrdom of many prominent figures within the Christian community, which in turn helped to solidify the faith and inspire further devotion among its followers.

Finally, Diocletian's abdication in 305 AD and the subsequent power struggles among his successors weakened the empire and allowed for the rise of Constantine, who would go on to become the first Christian emperor of Rome. It was under Constantine's rule that Christianity was officially recognized and granted legal status within the empire, ultimately leading to its emergence as the dominant religion of the Roman Empire. In summary, while Diocletian's persecution of Christians was a dark period in history, his unintentional contributions to the eventual emergence of Christianity as the official religion of the Roman Empire cannot be ignored.

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Answer: Argon-52

Explanation: Its B

To confirm the presence of \(\(Pb^2^+\)\) ions, the substance that can be used is potassium thiocyanate (KSCN). Therefore, the correct answer is: e. Potassium thiocyanate

When potassium thiocyanate is added to a solution containing \(Pb^2^+\) ions, it forms a reddish-brown precipitate called lead(II) thiocyanate \((Pb(SCN)^2)\). This reaction is a common test for the presence of \(Pb^2^+\) ions.

The reaction can be represented by the following equation:

\(Pb^2^+\) (aq) + 2 \(SCN^-[/tex} (aq) → \(Pb(SCN)^2\) (s)

In this reaction, the Pb2+ ions from the solution react with the thiocyanate ions (SCN-) to form a reddish-brown precipitate of lead(II) thiocyanate. The formation of the precipitate confirms the presence of \(Pb^2^+\) ions in the solution.

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Answer:

CH³–C=CH——CH³–CH=CH²

Explanation:

THIS IS PROPYNE TO PROPENE

Answer:

Electronegativity is the relative ability of an atom involved in covalent bonding to pull electrons toward itself.

Answer:

Electronegativity

Explanation:

Electronegativity is the ability of an atom to attract electron.

Electronegativity increases as it get closer to fluorine since fluorine is the most electronegative element.

The gram-formula mass of the product in the given reaction is 201.8g.

Gram Formula mass is the atomic mass of one mole of an element or a molecular compound, or an ionic compound.

To calculate the gram formula mass of a compound, the following applies;

According to this question, propene reacts with bromine to produce bromo propane with the molecular formula; C₃H₆Br₂.

Gram formula mass = 12(3) + 1(6) + 79.9(2) = 201.8g

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Answer:

an element

Explanation:

it said compound and a compound is element.

Answer:

The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

Answer:

The number of protons in the nucleus of the atom is equal to the atomic number.

The number of electrons in a neutral atom is equal to the number of protons.

Explanation:

Total, 9.11 liters of hydrogen gas at STP are required to produce 7.85 g of H₂O.

The chemical equation for a reaction between hydrogen gas (H₂) as well as oxygen gas (O₂) to form water (H₂O) is;

2H₂ + O₂ → 2H₂O

This balanced chemical equation tells us that 2 moles of hydrogen gas react with 1 mole of oxygen gas to produce 2 moles of water.

We can use the molar mass of water to convert the given mass of H₂O to moles;

molar mass of H₂O = 2(1.008 g/mol) + 15.999 g/mol = 18.015 g/mol

7.85 g H₂O / 18.015 g/mol = 0.435 mol H₂O

Since 2 moles of H₂O are produced for every 2 moles of H₂, we know that 0.435 mol H₂O requires 0.435 mol H₂.

Now, we can use the ideal gas law to calculate the volume of H₂ gas at standard temperature and pressure (STP) required to contain 0.435 mol of H₂;

PV = nRT

where P = pressure (at STP, P = 1 atm), V = volume, n = number of moles, R = the ideal gas constant (0.08206 L·atm/mol·K), and T = temperature (at STP, T = 273 K).

Rearranging the equation to solve for V;

V = nRT/P = (0.435 mol) x (0.08206 L·atm/mol·K) x (273 K) / (1 atm) = 9.11 L

Therefore, 9.11 liters of H₂ gas at STP are required to produce 7.85 g of H₂O.

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Answer:

one

Explanation:

im sure its one

Only 1 time, Moon rotate on its axis during a lunar month. Therefore, the correct option is option A among all the given options.

Nearly everything around us is in motion in a rotating direction. The movement of the cricket ball, celestial bodies, the majority of the enjoyable activities in amusement parks, every machine, washing machines, etc. Rotational motion is displayed by objects that revolve around an axis.

While not all of the body's constituent parts move in the same way, all of the body's constituent parts move in the same direction. By necessity, it becomes crucial that we investigate how the various rigid body particles move as the body is rotated. Only 1 time, Moon rotate on its axis during a lunar month.

Therefore, the correct option is option A.

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