can one substance can be changed into a different substance if the atoms are reorganized in the way they are attached to each other

To calculate the molar mass of the unknown protein, we can use the formula for osmotic pressure:

π = (n/V)RT

where:

π is the osmotic pressure,

n is the number of moles of solute,

V is the volume of the solution in liters,

R is the ideal gas constant (0.0821 L·atm/(mol·K)), and

T is the temperature in Kelvin.

First, let's convert the given values to the appropriate units:

Mass of protein = 28.85 mg = 0.02885 g

Volume of solution = 29.0 mL = 0.0290 L

Osmotic pressure = 3.28 torr

Now, we rearrange the osmotic pressure formula to solve for n:

n = (πV) / (RT)

Substituting the values:

n = (3.28 torr * 0.0290 L) / (0.0821 L·atm/(mol·K) * 289 K)

n ≈ 0.0386 mol

Next, we can calculate the molar mass (M) of the protein using the formula:

M = mass / moles

M = 0.02885 g / 0.0386 mol

M ≈ 0.746 g/mol

Therefore, the molar mass of the unknown protein is approximately 0.746 g/mol.

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Answer:

1. earth metal 2. halogen 3.The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. ... Elements in the periodic table are organized according to their properties.

Inventor: Dmitri Mendeleev please name most brainliest

Answer:

he or she is right

make tissues is the answer

Explanation:

hope this helps :)

Carbon-oxygen (C-O) sigma (σ) bonds in organic molecules.

In organic chemistry, carbon and oxygen atoms commonly form sigma bonds when they share electrons to create stable molecular structures. A sigma bond is a type of covalent bond characterized by the head-on overlap of atomic orbitals.

To determine the number of C-O σ bonds in a given organic molecule, you would need to analyze its structure and identify the carbon and oxygen atoms directly bonded to each other. Each such bond would be considered a C-O σ bond.

It's important to note that organic molecules can have various structures and arrangements of atoms, resulting in different numbers of C-O σ bonds. To accurately determine the number of C-O σ bonds in a specific organic molecule, it would be helpful to provide its structural formula or a detailed description of its arrangement of atoms.

If you can provide more specific information about the organic molecule you're referring to, I'll be happy to assist you further in determining the number of C-O σ bonds present.

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The pH a 0.25 m solution of C₆H₅NH₂ is equal to 3.13.

pH of the weak base will be calculate by using the Henderson Hasselbalch equation as:

pH = pKb + log([HB⁺]/[B])

pKb = -log(1.8×10⁻⁶) = 5.7

Chemical reaction for C₆H₅NH₂ is:

                          C₆H₅NH₂ + H₂O → C₆H₅NH₃⁺ + OH⁻

Initial:                     0.25                           0            0

Change:                    -x                             x             x

Equilibrium:        0.25-x                           x             x

Base dissociation constant will be calculated as:
Kb = [C₆H₅NH₃⁺][OH⁻] / [C₆H₅NH₂]

Kb = x² / 0.25 - x

x is very small as compared to 0.25, so we neglect x from that term and by putting value of Kb, then the equation becomes:

1.8×10⁻⁶ = x² / 0.25

x² = (1.8×10⁻⁶)(0.25)

x = 0.67×10⁻³ M = [C₆H₅NH₃⁺]

On putting all these values on the above equation of pH, we get

pH = 5.7 + log(0.67×10⁻³/0.25)

pH = 3.13

Hence pH of the solution is 3.13.

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pH of the buffer solution is 0.18.

The following expression can be used to determine the pH of an acidic buffer solution:

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

We can determine the salt and acid concentrations by changing the supplied values in the expression above.

[Salt] = 6 M

[Acid] =  4 M

Change the values in the equation above.

pH = 1.32 * 10⁻⁵ + log

pH = 1.32 * 10⁻⁵ + 0.17609

pH = 0.0000132 + 0.17609

pH = 0.1761032

pH = 0.18

As a result, the buffer solution's pH is 0.18.

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The time take to effusion similar amount of cl2 gas under same conditions is 406s, option D.

The process of a gas escaping from a container through a hole that is significantly smaller in diameter than the molecules' mean free route is known as effusion in physics and chemistry. The gas escape is caused by the pressure difference between the container and the outside, which is why such a hole is sometimes referred to as a pinhole. Since there are almost no molecular collisions in the vicinity of the hole, practically all molecules that reach the hole continue and pass through it.

Using Graham's Law of Effusion, we can determine the effusion rate of chlorine gas. Required values to determine the effusion rate are:

Molar mass of N₂ = 28 g/mol

Molar mass of Cl₂ = 70.5 g/mol.

Rate N₂ = 1/255 = 3.921 x 10⁻³ s⁻¹

Isolating for the effusion rate of chlorine gas and by plugging in the necessary values, we arrive with the effusion rate.

rate Cl₂ = rate N₂\(\sqrt{\frac{M_N_2}{M_Cl_2} }\)

= 3.921 x 10⁻³ \(\sqrt{\frac{28}{70.5} }\)

= 2.471 x 10⁻³ s⁻¹

Thus, we arrive with the time below by taking the reciprocal of the effusion rate:

t = 1/2.5x10⁻³

t = 406 s.

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The molecules in system #2 have a higher kinetic energy because they are at a higher temperature than molecules in system#1.

Temperature is defined as a measure of the average kinetic energy of the molecules of a body. The higher the temperature of a body, the higher the kinetic energy of the molecules of the body.

In both systems, we have water molecules that have the same formula H2O. However, the molecules in system #2 have a higher kinetic energy because they are at a higher temperature than molecules in system#1.

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Answer: sorry its lagging i hope this help fore 18.. =D

Explanation:

n,s is repeating the cycle of the inside

Answer/Explanation:

18, a,

I believe the n, and s represents North, South, or just the way the arrows are rotating repeatedly.

18, b,

The phenomenon re-occurring shows the alignment of magnetic dipoles with in a magnet, like inside. The arrows show a direction in the line with an external magnetic field in a way that it can produce its own magnetic fields that seem to travel from North to the South.

18, c,

Incorrect. Refrigerator magnets have multiple layers of magnification, they use opposite polarities to stay this way. If he puts the magnet sideways it may stick to the fridge

~ LadyBrain

Answer:

molar mass of caco3 is

100.0869 g/ mol

Answer:

volcanic eruptions

Explanation:

Answer:

invalid

Explanation:

Just imagine doing this experiment MULTIPLE TIMES and one of the trials you get 72 Kcal while in another u get 12kcal. It doesn't make sense. Somewhere in the experiment she went wrong. So its invalid

In a chemical reaction the total mass of all substances taking part in the reaction remains the same... The law of conservation of mass states that the total mass of substances taking part in a chemical reaction is conversed during the reaction

Answer:

mutual relationship

Explanation:

pls mark brainliest

Answer:

02- i think your welcome hope it helps

Answer:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

Answer:

hope this helps

Explanation:

Photosynthesis

Photosynthesis

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's metabolic activities. This chemical energy is stored in carbohydrate molecules, such as sugars, which are synthesized from carbon dioxide and water – hence the name photosynthesis, from the Greek phos, "light", and sunthesis "putting together". In most cases, oxygen is also released as a waste product. Most plants, algae, and cyanobacteria perform photosynthesis; such organisms are called photoautotrophs. Photosynthesis is largely responsible for producing and maintaining the oxygen content of the Earth's atmosphere, and supplies most of the energy necessary for life on Earth.

\(\\ \sf\bull\dashrightarrow 1g/ml=\dfrac{100}{10}dg/cl\)

\(\\ \sf\bull\dashrightarrow 1g/mL=10dg/cL\)

Now

\(\\ \sf\bull\dashrightarrow 1.09g/mL\)

\(\\ \sf\bull\dashrightarrow 1.09(10)\)

\(\\ \sf\bull\dashrightarrow 10.9dg/cl\)

Answer:

Explanation:

Answer:

1.Ecologists often estimate the size and density of. populations using quadrats and the mark-recapture method.

2. The two key components of ecosystem stability are resilience and resistance.

3.The availability of abiotic factors (such as water, oxygen, and space) and biotic factors (such as food) affect population

4. When the climate is changing in the colder direction it effects the planet in the opposite way than it does when it is changing in the warmer direction. Ad nauseam the contemporary, it’ll keep getting hotter and at a greater rate so the ecosystem is going to die.

The molarity of that aqueous is 1.3 M. As per given information already contain moles and volume, all you have to do is divide the moles with volume.

Molarity or symbolize as M is the total amount of a substance in the certain volume of a solution. Molarity in a correlation with mole and volume are defined as the moles per liter. Molarity is also called as the molar concentration of a solution. In formula, molarity(M) will be represent as M = m : V. As per data given m = 2 moles and V = 1.5 liters. The value of its molarity will be:

M = m : V

M = 2 : 1.5

M = 1.3 M

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The average soil resistivity near the substation is approximately 5.612 Ω·m.

To calculate the average soil resistivity near the substation, we can use the Wenner four poles equal method and the given soil resistance readings.

The formula for calculating soil resistivity using the Wenner method is:

ρ = (π * spacing * sum of resistance) / (2 * π * probe length)

Where:

ρ = Soil Resistivity

spacing = Distance between the current electrodes (m)

sum of resistance = Sum of the measured soil resistance values (Ω)

probe length = Length of the probe (m)

In this case, the probe distance intervals are 1, 2, 3, 4, and 5 m, and the corresponding soil resistance values are 16.4, 5.29, 3.05, 1.96, and 1.36 Ω, respectively.

Let's calculate the average soil resistivity:

spacing = 1 m (since the distance between the current electrodes is not mentioned, we assume it to be 1 m)

sum of resistance = 16.4 + 5.29 + 3.05 + 1.96 + 1.36 = 28.06 Ω

probe length = 5 m (as given in the intervals)

Using the formula, we have:

ρ = (π * spacing * sum of resistance) / (2 * π * probe length)

= (π * 1 * 28.06) / (2 * π * 5)

= 5.612 Ω·m

Therefore, the average soil resistivity near the substation is approximately 5.612 Ω·m.

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Moles of water:-

Answer:

812.3 kilogram/cubic meter

Explanation:

I used an online calculator.

Hope I helped!

Heptan-1-amine's structural formula can be drawn as C7H17N.

Heptanamine or heptan-1-amine is an organic chemical compound with the molecular formula C7H17N. It is an amine that belongs to the class of primary amines, in which the amino group is attached to the carbon chain's primary carbon atom. In this compound, the amino group is connected to the first carbon atom in the heptane chain.

The structure of heptan-1-amine is as follows:

Heptanamine is a clear and colorless liquid with a fishy odor, soluble in water and ethanol. Its boiling point is 184°C, and its melting point is -62°C. It is used in the manufacture of surfactants, pharmaceuticals, and other organic compounds, and it is also used as an intermediate in the synthesis of other chemicals.

In conclusion, heptan-1-amine's structural formula can be drawn as C7H17N.

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Arena might be investigating a separation technique known as evaporation, but she is missing a burner to perform it properly.

i) Evaporation is a separation technique that can be used to separate a substance dissolved in a liquid. It is usually applicable when the solvent doesn't have a too high boiling point and the solute is not prone to degradation at increased temperature.
ii) However, as the method requires heating the solution in order to accelerate the evaporation of the solvent, and while the tripod stand and wire gauze are used to mount the beaker with the solvent, they are useless without a burner that is used to introduce heat.

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37 percent is the increase in percentage.

The air bubbles locked in ice sheets as well as glaciers over Earth's previous three glacial cycles are used in the second graph to depict carbon dioxide (CO2) levels during those periods. Human activities had boosted atmospheric CO2 approximately 50% since the start of the industrial era (in the 18th and 19th centuries), bringing it to 150% of it's own value in 1750.

Actually 282 ppm means 282 gm of CO2 is in 1 million gm of air similarly 382 ppm means 387 gm is in 1 million gm of air . Increase in mass of CO2 387-282 = 105 gm .

So percentage increase= (105× 100)÷282= 37%

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