What is the molar mass of a protein if a 0. 30 l of solution containing 0. 45 g of the protein has an osmotic pressure of 0. 80 torr at 25∘c?

Answer:

B. Past changes in the climate have been faster than the changes we're seeing today

Explanation:

The Earth is warming abnormally quickly . Over the past century it has warmed roughly 10 times faster than the average increase in temperature after each ice age .

so the answer is B.Past changes in the climate have been faster than the changes we're seeing today.

The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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Answer:

Water is the answer

mark me brainlist

Answer:Naming Covalent compounds

A B

hexaboron silicide B6Si

chlorine dioxide ClO2

hydrogen iodide HI

iodine pentafluoride IF5

Explanation:

The temperature is 250 K.

The law that the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant.

By  ideal gas law , PV = nRT

P = 10 atm

V = 5 l

n = 2.5 mol

R = 0.0821 atm liter mol⁻¹ K⁻¹

T = Temperature is to find out according to question.

Put these values in PV = nRT

PV = nRT

10 × 5 = 2.5 × 0.0821 × T

T = 50/0.2

T = 250 K

Hence, the temperature is 250 K.

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Solution,

Mass of Mg - 21gm

molar mass of Mg - 24gm

moles = Given mass/ Molar mass

moles = 21/24 = 0.875

1 mole of Mg produce 1 mole of H2 gas

so 0.875 mole of Mg will produce 0.875 moles of H2 gas

One mole of H2 gas = 22.4 litre

0.875 mole of H2 gas = 0.875×22.4

0.875 mole of H2 gas = 19.60 litre

So the nearest ANSWER is Option four 19.37 litre.

STP is the standard temperature and the pressure of the gases of the system. The volume of the hydrogen that will be produced as STP is 19.37 litres.

Volume is the amount of the substance or the solution occupied in an area or object and is estimated in L or mL. It is a scalar quantity.

Given,

Mass of magnesium = 21 gm

Molar mass of magnesium = 24 gm/mol

Moles of magnesium can be calculated as,

\(\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\;mass}\\\\&= \dfrac{21}{24}\\\\&= 0.875 \;\rm mol\end{aligned}\)

If 1-mole magnesium = 1-mole hydrogen gas

Then 0.875-mole magnesium = 0.875 moles of hydrogen gas

If 1 mole of hydrogen gas = 22.4 L

Then, 0.875 moles of hydrogen gas = x L

Solving for x:

\(\begin{aligned}\rm x &= 0.875 \times 22.4\\\\&= 19.60 \;\rm litre\end {aligned}\)

Therefore, the volume of hydrogen at STP would be option 4. 19.37 litres.

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Answer:

Continental Drift by Alfred Wegener

Earth's landmasses are in constant motion due to plate tectonics.

Hope this helps :)

Answer:

There is no attachment

however, u could remove the object

Answer:

The pressure of an object, is made off of atoms, and the hotter they are, the quicker they'll go. Meaning they're under pressure, and the atoms begin to start to melt, and as it'll go the object will start catching on fire. The way how an object and atom are out of pressure is to be cooled, the cooling of an atom freezes the atom, which'll mean they wont move or do anything matter of fact. Thus, the cooling of atoms is how you take an object/atom out of pressure.

Hope this helps. :)

Answer:

i cant see the image im good at chem if you can write it down in the comments ill answer it

Explanation:

Electromagnetic forces are forces that arise between electrically charged particles. They are the result of the interaction between their electromagnetic fields and occur due to the exchange of photons, which carry the electromagnetic force.

These forces can act over long distances and are responsible for various phenomena, including the repulsion or attraction of charged objects.

When it comes to the phenomenon of two oranges repelling each other, it can be explained by the presence of charged particles within the oranges. Oranges contain a large number of charged particles, approximately 10^29. These charged particles consist of negatively charged electrons and positively charged protons.

When two oranges are brought close together, the like charges within them (negative charges from electrons or positive charges from protons) create electromagnetic forces. According to Coulomb's law, like charges repel each other. As a result, the oranges experience a repulsive force that causes them to push away from each other.

In conclusion, the repulsion of two oranges when brought together is due to the electromagnetic forces generated by the like charges within the oranges. The negatively charged electrons and positively charged protons within the oranges create forces of repulsion, causing the oranges to repel each other. This phenomenon can be explained by the principles of electromagnetism and Coulomb's law.

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Answer:

Mass of water == 1.71 g

Explanation:

Given data:

Initial temperature of water = 10°C

Final temperature of water = 50°C

Energy absorbed = 286 J

Mass of water = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Specific heat capacity of water is 4.18 J/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT =  50°C -  10°C

ΔT = 40°C

by putting  values,

286 J = m × 4.18 J/g.°C × 40°C

286 J = m × 167.2 J/g

m = 286 J / 167.2 J/g

m = 1.71 g

The theoretical yield of sodium chloride is approximately 1.755 grams.

The theoretical yield of sodium chloride (NaCl) when 2.500 g of sodium bicarbonate (NaHCO3) reacts with hydrochloric acid (HCl), we need to consider the balanced chemical equation:

2 NaHCO3 + 2 HCl → 2 NaCl + 2 H2O + 2 CO2

From the equation, we can see that two moles of NaHCO3 produce two moles of NaCl.

First, we calculate the number of moles of NaHCO3 using its molar mass:

Molar mass of NaHCO3 = 23 + 1 + 12 + 16 + 16 + 16 = 84 g/mol

Moles of NaHCO3 = mass / molar mass = 2.500 g / 84 g/mol ≈ 0.030 moles

Since two moles of NaHCO3 produce two moles of NaCl, the theoretical yield of NaCl would also be approximately 0.030 moles.

To convert the moles of NaCl to grams, we use its molar mass:

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol

Theoretical yield of NaCl = moles of NaCl × molar mass of NaCl = 0.030 moles × 58.5 g/mol ≈ 1.755 g.

The theoretical yield of sodium chloride is approximately 1.755 grams.

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The air mass with the highest actual water vapor content is mT maritime tropical. The correct answer is A.

Maritime tropical air masses are warm and humid because they originate over warm ocean waters, which allows for a high amount of water vapor to be evaporated and contained within the air mass.

As such, mT air masses are known for their high dew point temperatures and can bring about humid and rainy conditions when they encounter cooler air masses.

Air masses are large bodies of air with relatively uniform temperature, humidity, and pressure characteristics that cover vast areas of the Earth's surface.

They play a critical role in determining the weather patterns in different regions of the planet.

The actual water vapor content of an air mass is determined by the temperature and humidity of the region from which it originates.

The mT (maritime tropical) air mass is known to have the highest water vapor content because it originates over warm ocean waters, which have a high capacity to evaporate water into the atmosphere.

This allows the air mass to hold a significant amount of moisture, resulting in high dew point temperatures and the potential for rain.

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The conversion of 2 - butanol to 2 - nitrobutane​ involves conversion of  2 butanol to 2 - bromobutane and subsequently to 2 - nitrobutane.

In order to convert 2 - butanol to 2 - nitrobutane​, an SN2 reaction is first carried out in which 2 - butanol  is converted to 2 - bromobutane. This reaction proceeds with inversion of configuration at the chiral carbon as expected.

This product is subsequently reacted with silver nitrite in ethanol to yield  2 - nitrobutane​ along side silver bromide. Some alkyl nitrite is also produced as a by product. The components of the mixture are separated by fractional distillation. The scheme of the reaction is shown in the image attached to this answer. This reaction is only applied to primary and secondary alkyl halides.

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Answer:

10kg

Explanation:

because matter can not be created or destroyed

The mass of the logs were 10 kg before the fire, the mass of the ash, carbon dioxide and water be after the fire is 10 kg because it follows law of conservation of mass.

The law of conservation of mass has given a statement that mass in a isolated system can neither be created nor destroyed in a chemical reaction or by physical transformation.

It can also be stated the mass can neither be created nor destroyed but it can transformed from one form to another form.

Thus, the mass of the logs were 10 kg before the fire, the mass of the ash, carbon dioxide and water be after the fire is 10 kg because it follows law of conservation of mass.

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Answer:

The answer is B

Explanation:

A pipe to the ground

The pH of the solution made by mixing equal volumes of the NaOH solution (pH 11.40) and the KOH solution (pH 10.30) is approximately 14.30.

To calculate the pH of the solution made by mixing equal volumes of a NaOH solution with a pH of 11.40 and a KOH solution with a pH of 10.30, you can use the concept of pH and the equation for calculating the pH of a solution:

pH = -log[H+]

First, convert the pH values to concentrations of H+ ions:

For the NaOH solution:

pH = 11.40

[H+] = \(10^{(-pH)\) = \(10^{(-11.40)\)

For the KOH solution:

pH = 10.30

[H+] = \(10^{(-pH)\) =\(10^{(-10.30)\)

Next, since the volumes are equal, you can assume that the final volume of the mixed solution is double the volume of each individual solution.

Let's assume the volume of each solution is V liters. Then the final volume of the mixed solution is 2V liters.

Now, since the volumes are additive, the total moles of OH- ions in the mixed solution will be equal to the sum of moles of OH- ions from each individual solution:

moles of OH- from NaOH solution = moles of NaOH = Molarity of NaOH × Volume of NaOH solution

moles of OH- from KOH solution = moles of KOH = Molarity of KOH × Volume of KOH solution

Since the volumes are equal and assuming the concentrations of NaOH and KOH solutions are 1 M, the moles of OH- ions in the mixed solution will be:

moles of OH- in the mixed solution = moles of NaOH + moles of KOH = (1 M × V) + (1 M × V) = 2 M × V

Since the OH- concentration is twice the concentration of NaOH or KOH, the concentration of OH- ions in the mixed solution is 2 M.

Now, using the concept of the autoionization of water, you can find the concentration of H+ ions in the mixed solution:

[H+] × [OH-] = 1 × \(10^{(-14)\) (at 25°C)

2 M × [OH-] = 1 × \(10^{(-14)\)

[OH-] = (1 × \(10^{(-14)\)) / (2 M) = 5 × \(10^{(-15)\) M

Finally, you can calculate the pH of the mixed solution by using the equation:

pH = -log[H+]

pH = -log(5 × \(10^{(-15))\)

pH ≈ 14.30

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NH4NO3. The pH of a solution is determined by the concentration of hydrogen ions (H+) present in it.

Concentration, also known as “mental focus”, is the act of focusing one’s thoughts and energies on a specific task or activity. It is a key element of successful learning and is an important skill in all areas of life. Concentration is the ability to filter out unimportant or irrelevant information, maintain focus on the task at hand, and block out distractions. With strong concentration skills, individuals can more easily process and retain information, solve problems, and make decisions.

NH4NO3 is a salt that can release protons (H+) into solution, which will then be neutralized by hydroxide ions (OH-). Therefore, when NH4NO3 is added to water, a solution with pH = 7.00 will be formed.

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The crash where the cone experience a stronger force is option D because: Crash 1: the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.

The ball is drawn back to Earth by gravitational force. The ball returns to Earth as a result of friction. The ball is forced back toward Earth by magnetic force.

A puck's velocity changes when a player makes contact with it when it is still. He causes the puck to speed up, in other terms. The hockey stick's force, which causes the acceleration, is responsible. The velocity grows as long as this force is in motion.

Therefore, the force applied to an object must be larger than what is required for a progressive slowing down if the object must be slowed down quickly. For instance, a bicycle's brakes will slow or stop it more quickly the more force is given to it.

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See full question below

After hockey practice, Carissa and Keenan were playing a game where they were pushing some objects to get them to crash. They were using a cone and two different pucks—a black one with more mass for Crash 1 and a blue one with less mass for Crash 2. They want to know what happened to the cone.

Use the information from the diagram to answer.

In which crash did the cone experience a stronger force? How do you know?

answer choices

There was no force on the cone. In both crashes, only the hockey puck experienced a force.

The diagram doesn’t tell you anything about the force on the cone. It only gives information about the force on the pucks.

It was the same force in both crashes; the hockey puck changed speed by the same amount in each crash, so the force on the cone was the same each time.

Crash 1; the force on the black hockey puck was stronger in this crash, so the force on the cone was also stronger.

Answer:

As a scientist employed by a manufacturer of cookware, I would recommend using alumina (Al2O3) as the material for a ceramic baking dish.

An Arrhenius base is a molecule that when dissolved in water will break down to yield an \(OH^-\)or hydroxide ion in solution.

An Arrhenius base is a compound that increases the \(OH^-\) ion concentration in aqueous solution.

An Arrhenius base is a substance that, when dissolved in an aqueous solution, increases the concentration of hydroxide, or , \(OH^-\) ions in the solution.

Bases Properties

Arrhenius bases that are soluble in water can conduct electricity.

Bases often have a bitter taste and are found in foods less frequently than acids. Many bases, like soaps, are slippery to the touch.

Bases also change the colour of indicators. Red litmus turns blue in the presence of a base (see figure below), while phenolphthalein turns pink.

Some bases react with metals to produce hydrogen gas.

Acids (pH < 7.0) react with bases (pH > 7.0) to produce a salt and water. When equal moles of an acid and a base are combined, the acid is neutralized by the base. The resulting mixture will have a more neutral pH.

An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons. In other words, it increases the number of \(H^+\) ions in the water. In contrast, an Arrhenius base dissociates in water to form hydroxide ions \(OH^-\).

Example, sodium hydroxide, is added to an aqueous solution. NaOH dissociates into sodium, \(Na^+\), and hydroxide, \(OH^-\) ions.

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Answer:

A proton carries a positive charge and an electron carries a negative charge

Explanation:

is this what u want???

The space between the inner or protective casing and the outer casing or drill hole should be filled with cement grout to a minimum of 20 feet. Therefore, the correct answer is c.) 20 feet.

Grouting is the process of adding a sealing substance, such as bentonite or plain cement, to the gap between a well casing and the borehole made during well construction.

The protection of public health and the quality of ground water can be achieved using grouting, which is both effective and essential. The DNRE has documented a number of instances where inadequate grouting or a lack of grouting in both consolidated and unconsolidated formations is suspected of being the cause of contaminants leaking into potable water aquifers along the well casing. Hence, The space between the inner or protective casing and the outer casing or drill hole should be filled with cement grout to a minimum of 20 feet. Therefore, the correct answer is c.) 20 feet.

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The variable that is unknown until the experiment is performed is the dependent variable.

In a scientific experiment, variables are classified into two main categories: independent variables and dependent variables. The independent variable is the variable that is intentionally manipulated or changed by the experimenter. It is under the control of the experimenter and is deliberately altered to observe its effect on the dependent variable.

On the other hand, the dependent variable is the variable that is measured or observed as the outcome or response in the experiment. It is the variable that is expected to change in response to the manipulation of the independent variable. The value or behavior of the dependent variable depends on the value or behavior of the independent variable.

Typically, before conducting an experiment, researchers have a hypothesis or an expectation about how the independent variable will affect the dependent variable. However, the actual outcome or result of the experiment, which is observed through the measurement of the dependent variable, remains unknown until the experiment is performed.

The purpose of conducting the experiment is to gather empirical data and observe the changes in the dependent variable to analyze the relationship between the independent and dependent variables.

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Answer:

How is the bond between carbon and hydrogen in methane DIFFERENT from the bond

Explanation:

The statement that is FALSE about VSEPR is "When electrons are not shared equally, it causes the molecule to bend"

Option C

VSEPR theory does not imply that unequal sharing of electrons causes a molecule to bend.

Rather, it is the repulsion between electron pairs, whether they are bonding or non-bonding, that determines the molecular geometry.

The VSEPR theory is based on the idea that valence electron pairs in the outermost shell of an atom repel each other, and the resulting repulsion determines the geometry of the molecule.

Therefore, Option C is false about VSEPR.

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The total macroscopic cross section of D2O at 2 MeV when A beam of 2-MeV neutrons is incident on a slab of heavy water (D2O) is 0.226 \(cm^{-1}\)

Let N be the number density

N\(_{D}\) = 2 N\(_{D2O}\) also N\(_{O}\) = N\(_{D2O}\)

Since the radiation independently interacts with the compound constituents therefore the cross-section of an atom is individually is equal to the total cross-section if we take it analogous to probability of collision therefore the individual probability is equal to total probability

At 2MeV

Now σ\(_{D2O}\) = σ\(_{o}\) + 2σ\(_{D}\) = 6.8×\(10^{-24}\) \(cm^{2}\)

N\(_{D2O}\)  = 0.03323×\(10^{24}\) molecules/  \(cm^{3}\)

∑D\(_{2O}\) =  σ\(_{D2O}\) × N\(_{D2O}\)

= 6.8×\(10^{-24}\) × 0.03323×\(10^{24}\) = 0.226 \(cm^{-1}\)

All of the nuclei present in the material's volume have an effective target area that is represented by the macroscopic cross-section (such as fuel pellet). The measurement units are in cm-1. It is the likelihood of a neutron interacting with a nucleus for every centimetre of neutron flight. These data are frequently used by programmes for reactor core analysis and design. These codes were developed using previously computed assembly homogenised cross-sections.

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For a reaction to be spontaneous, the change in enthalpy (ΔH) should be negative (exothermic), and the change in entropy (ΔS) should be positive (increase in disorder). The Gibbs free energy (ΔG) can be used to determine the spontaneity, where a negative value of ΔG indicates a spontaneous reaction.

The change in enthalpy (ΔH) and change in entropy (ΔS) values provide important information about the spontaneity of a reaction. For a reaction to be spontaneous, it should have a negative ΔH (exothermic) and a positive ΔS (increase in disorder).

1. If ΔH is negative, it means that the reaction releases energy in the form of heat. This is favorable for a spontaneous reaction because it indicates that the products are more stable than the reactants.

2. If ΔS is positive, it implies an increase in the randomness or disorder of the system. This increase in entropy favors the spontaneity of a reaction since nature tends to move towards higher entropy states.

3. To determine whether a reaction is spontaneous, we can use Gibbs free energy (ΔG). The relationship between ΔH, ΔS, and ΔG is given by the equation: ΔG = ΔH - TΔS, where T represents temperature. If ΔG is negative, the reaction is spontaneous.

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The ideal gas law is PV = north, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature. At STP (standard temperature and pressure), which is defined as 0°C and 1 atm, the pressure and temperature values are fixed, and therefore we can simplify the ideal gas law to V = north/P.

The gas is at STP and is contained in a volume of 22.4 L. Therefore, we can substitute the known values into the simplified ideal gas law equation. 22.4 L = north/1 atm Rearranging the equation to solve for n, we get n = 22.4 L * 1 atm / R * 273 K where R is the gas constant 8.31 J/mol*K and 273 K is the temperature at STP. Substituting these values, we get n = 22.4 L * 1 atm / 8.31 J/mol*K * 273 K Simplifying the equation, we get n ≈ 1 Therefore, the approximate value of n according to the ideal gas law is 1. It is important to note that the ideal gas law is an approximation and assumes that the gas particles are point masses with no volume, do not interact with each other, and experience no intermolecular forces. In reality, gases deviate from the ideal gas law at high pressures and low temperatures, and the accuracy of the ideal gas law decreases as the gas approaches its condensation point. In summary, at STP in a container of 22.4 L, the approximate value of n according to the ideal gas law is 1.

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