calculate the osmotic pressure of a solution containing 24.2 g of glycerin (c3h8o3) in 260.0 ml of solution at 290 k . express your answer in atmospheres to three significant figures.

Answer:

The hydroxide ion concentration in an aqueous solution, [OH-], in mol L-1, can be calculated if the pOH of the solution is known.

pOH is defined as the negative logarithm (to base 10) of the hydroxide ion concentration in mol L-1 pOH = -log10[OH-]

Explanation:

The volume of Neon gas is 326.5 L in 8. 9 * 10 ^ 25 atoms as per the ideal gas law equation.

The given atoms of Neon gas =  8. 9 * 10 ^ 25

To calculate the volume of any gas we should use the ideal gas law equation.

PV = nRT

Here R is the universal gas constant.

To calculate the volume, we need to calculate the number of moles of neon gas. Avogadro's number is used to convert the number of atoms to moles:

1 mole of neon gas = 6.022 * 10^23 atoms of neon gas

The total number of moles of neon gas is:

8.9 * 10^25 atoms / 6.022 * 10^23 atoms/mol = 14.79 mol

Let's assume the temperature is 25°C  = 298 K

The pressure = 1 atm.

The value of R =  0.08206 Latm/(molK).

PV = nRT

V = (NRT) / P

V = (14.79 mol * 0.08206 Latm/(molK) * 298 K) / 1 atm

V = 326.5 L

Therefore we can conclude that the volume of Neon gas is 326.5 L.

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B. methylcyclopentane

F. propane

G. n-pentane are the following molecules would a flame ionization detector (FID) be sensitive to after separation on a gas chromatography column.

flame ionization detector(FID) The most used detector in gas chromatography is the flame ionization detector . Since practically all organic molecules include carbon atoms (C), the FID is sensitive to and capable of identifying them. As nitrogen, the primary component of air, won't burn under these circumstances, and chromatography the technology is also insensitive to moisture and carbon dioxide, hydrocarbons in the environment can be found using flame ionization detector (FID).

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Answer:

Shifting their growing range towards the equator

Explanation:

Maybe will be like that

Answer:

Ability to store water in leafy structures to prevent excess evaporation.

Explanation:

The reason why plants die in hot temperature is the excess evaporation of water, so to prevent the excess evaporation of water, the plants get adaptive to store water in their leaves.

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The value of ΔG at 298 K for a reaction mixture containing 1.9 atm N2, 1.6 atm H2, and 0.65 atm, the answer is (a) -3.86 × 10^3.

NH3 can be calculated using the equation:

ΔG = ΔG° + RT ln(Q)

where ΔG is the standard Gibbs free energy change, ΔG° is the standard Gibbs free energy change at standard conditions, R is the gas constant, T is the temperature in Kelvin, and Q is the reaction quotient.

In this case, we are given ΔG° as -33.3 kJ/mol. To calculate Q, we need to use the partial pressures of the gases in the reaction mixture. The reaction stoichiometry tells us that the ratio of the partial pressures of N2, H2, and NH3 is 1:3:2. Therefore, we can write:

Q = (P(NH3))^2 / (P(N2) * P(H2)^3)

Plugging in the given values of P(N2) = 1.9 atm, P(H2) = 1.6 atm, and P(NH3) = 0.65 atm, we can calculate Q. Then, using the value of R = 8.314 J/(mol·K) and the temperature T = 298 K, we can substitute these values into the equation and solve for ΔG.

The calculated value of ΔG at 298 K for the given reaction mixture is approximately -3.86 × 10^3 J/mol. This value is equivalent to -3.86 kJ/mol. Therefore, the answer is (a) -3.86 × 10^3.

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Answer:B. How much nitric acid solution is present?

Explanation:

Answer:

A. What is the concentration of nitric acid?

Explanation:

Titrations are used to find the unknown concentration of a substance as the phenolphthalein indicator helps to indicate when there is enough base to neutralize the acid.

Using this information along with a chemical formula it is possible to work out the unknown concentration of the acid with the known volume you used of the base.

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An electron configuration determines the kinds and numbers of bonds an atom will form with each other  atom . Carbon can form four covalent bonds with a variety of atoms due to its four valence electrons .

Other molecules can bond to carbon. An atom's features are largely determined by its electron configuration . Four covalent bonds can form with carbon. Chemical bonds known as covalent bonds can occur between nonmetals. Two atoms with covalent bonds have equal or identical electronegativity. Two atoms so share four pairs of electrons.

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Answer:

Sodium chloride will conduct electricity only when it is in a liquid state or in solution, this is because the ions are free to move in this state, allowing them to carry charge and conduct electricity.

Explanation:

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Rutherford said that the atom is mostly empty space, with a small, dense positively charged nucleus located at the center.

Ernest Rutherford conducted the famous gold foil experiment, which involved bombarding a thin sheet of gold with alpha particles. He observed that most of the alpha particles passed straight through the gold foil, but some were deflected at angles, and a few bounced back in the direction they came from.

This led him to conclude that the atom was mostly empty space, with a small, dense nucleus at the center that was positively charged and contained most of the atom's mass. The negatively charged electrons were located in the space surrounding the nucleus, but they were much smaller and lighter than the nucleus itself.

In conclusion, Rutherford's discovery of the atomic nucleus revolutionized our understanding of the structure of the atom. It provided a more accurate picture of the atom than the previous plum pudding model, which suggested that the atom was a uniform blob of positive charge with electrons embedded throughout. Rutherford's model showed that the atom was a complex structure with a small, but incredibly dense nucleus at its center, surrounded by electrons in a cloud-like arrangement.

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Answer:

hydrogen is a non-metal and it has 1 valence electron

Explanation:

You can find the valence electrons on the bottom left of your periodic table, it is under the atomic number. Hydrogen is a non-metal because hydrogen conducts heat and electricity poorly.

Answer:

D) C₄H₉OH

Explanation:

In chemistry, isomers are chemical substances with the same formula (That is, same atoms but in different structures).

For the compound C₂H₅OC₂H₅ there are 4 atoms of C, 10 atoms of H and 1 atom of O.

A) CH₃COOH . This compound have 2 atoms of C, 4 atoms of H and 2 atoms of O. Thus, isn't an isomer.

B) C₂H₅COOCH₃. There are 4 atoms of C but 8 atoms of H and 2 atoms of O. Isn't an isomer

C) C₃H₇COCH₃. There are 5 atoms of C, 10 atoms of H and 1 atom of O. Thus, isn't an isomer

D) C₄H₉OH. Here, you have 4 atoms of C, 10 atoms of H and 1 atom of O. That means this structure is the isomer of C₂H₅OC₂H₅

The volume of 3.990 M HCl containing 0.4136 moles of HCl can be calculated as 103.7 mL.

To calculate the volume of a solution, we can use the formula:

Volume (in mL) = (moles of solute) / (concentration of the solution in M)

Concentration of HCl solution = 3.990 M

Moles of HCl = 0.4136 moles

Using the formula, we can substitute the given values:

Volume (in mL) = (0.4136 moles) / (3.990 M)

Calculating the volume:

Volume (in mL) = 0.1037 L * 1000 mL/L

Volume (in mL) ≈ 103.7 mL

The volume of a 3.990 M HCl solution containing 0.4136 moles of HCl is approximately 103.7 mL. This calculation allows us to determine the volume of a solution based on its concentration and the amount of solute present.

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Answer: The ratio of carbon dioxide molecules to oxygen molecules is 20 :31

Explanation:

Combustion is a chemical reaction in which hydrocarbons are burnt in the presence of oxygen to give carbon dioxide and water.

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced combustion reaction is,:

\(2C_{10}H_{22}(l)+31O_2(g)\rightarrow 20CO_2(g)+22H_2O(g)\)

Thus the ratio of carbon dioxide molecules to oxygen molecules is 20 : 31

Answer:

D

Explanation:

Reduction refers to gain in electrons. Hence it is D

Oxidation occurs when the element loses electrons. Hence A is wrong

Answer:

The correct answer is - 1/4 0f 6 gram or 1.5 gram to be exact.

Explanation:

Given:

Half-life of sulfate-12 = 18 years

number of half-lives - 2

initial amount - 6 grams.

Solution:

The Half-life of an element or substance is the required time to decay the half amount of the initial amount of the element.

Remaining amount = initial amount * (1/2)^n

here n = number of half lives

then,

Remaining amount = 6* (1/2)^2

= 6/4

= 1.5 g.

Thus, the correct answer is = 1.5 g or 1/4 of 6 gram.

In organic chemistry, a functional group is a specific group of atoms or bonds within a compound that is responsible for the characteristic chemical reactions of that compound.

The same functional group will behave in a similar fashion, by undergoing similar reactions, regardless of the compound of which it is a part. Functional groups are groups of atoms that occur within organic molecules and confer specific chemical properties to those molecules. When functional groups are shown, the organic molecule is sometimes denoted as “R.”  Some of the important functional groups in biological molecules include: hydroxyl, methyl, carbonyl, carboxyl, amino, phosphate, and sulfhydryl groups.

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Answer:

\(-3.06\) is the overall voltage produced

Explanation:

Potassium and Tin are connected in an electrochemical series.

In a series circuit, the resultant voltage is equal to the sum of voltage drops at all points in the circuit.

Here,

The voltage drop at potassium \(= -2.92\)

The voltage drop at Tin \(= -0.14\)

The net voltage

\(= -2.92 -0.14 \\= -3.06\)

Answer:

7

the atomic number of element X is 3, then atomic number of element Y is 7

Answer:

when acid and the base mix it is bonding together and that makes it have a little blast but because of the acid

Explanation:

acid is the mane thing that makes 50% of things blast like as if i were to put baking soada and acid it would blast.  

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The name of the process shown in the diagram is of filtration which is a separation technique.

Filtration is defined as a process by which solid particles which are present in liquid or gaseous medium are allowed to be removed using a filter medium which retains the particles but allows the liquid to pass through.

The requirements for filtration are a filter medium ,fluid containing particles , a mechanical device usually a filter and a driving force.The filter media is classified depending on the pore size of particles which are to be filtered.

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As per the pictorial representation,the first image is of an element while the second one is that of a mixture of an element and a compound.

It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

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Answer:

D

Explanation:

Isotopes undergo radioactive decay because thermodynamics generally governs the situation. Every atom strives to have the greatest degree of stability. When the number of protons and neutrons in the atomic nucleus is out of balance, instability results in radioactive decay. In essence, the nucleus contains too much energy to keep all the nucleons together.

Radioactive decay a the spontaneous process through which an unstable atomic nucleus breaks into smaller, more stable fragments.

Three Types of Radioactive Decay:

Alpha Decay:

       When an alpha particle basically a helium nucleus with two protons and two neutrons is ejected, the parent's atomic number and mass number are reduced by two and four, respectively.

Beta Decay:

      A stream of electrons from the parent, known as beta particles, is released during beta decay, and a neutron in the nucleus is changed into a proton. The new nucleus has the same mass number, but an additional atomic number of one.

Gamma Decay:

        The atomic nucleus releases extra energy during gamma decay in the form of high-energy photons (electromagnetic radiation). The resultant nucleus takes on a more stable energy state while maintaining the same atomic number and mass number.

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Answer:

A.5

Explanation:

While he was researching and writing that book in the 1860s, Mendeleyev made the discovery that led to his most famous achievement. He noticed certain recurring patterns between different groups of elements and, using existing knowledge of the elements' chemical and physical properties, he was able to make further connections. He systematically arranged the dozens of known elements by atomic weight in a grid-like diagram; following this system, he could even predict the qualities of still-unknown elements. In 1869, Mendeleyev formally presented his discovery of the periodic law to the Russian Chemical Society.

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Answer:

Explanation:

For water, the temperature needs to be a little over zero degrees Celsius (0C) for you to melt. If you were salt, sugar, or rock, your melting point is higher than that of water.

B is the answer because fractional distillation is used to separate particles of different boiling paints.

Fractional distillation of crude oil is used to separate hydrocarbons by their boiling point. The correct answer is option B.

Fractional distillation is a process that separates these hydrocarbons based on their boiling points.

During fractional distillation, crude oil is heated to a high temperature, causing it to vaporize.

Therefore, the correct answer is option B. boiling point.

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The statement that is true about half-lives is: Each radioactive isotope has its own half-life.

Half-life is the time it takes for half of the radioactive atoms in a sample to undergo radioactive decay. It is a characteristic property of a specific radioactive isotope.

1. Radioactive nuclides are atoms that are unstable and undergo radioactive decay, emitting radiation in the process.

2. Each radioactive isotope, which is a specific form of an element with a different number of neutrons, has its own unique half-life.

3. Different radioactive isotopes decay at different rates, leading to different half-lives. For example, the half-life of uranium-238 is about 4.5 billion years, while the half-life of carbon-14 is about 5,730 years.

4. The half-life is determined by the inherent stability or instability of the atomic nucleus and is not dependent on the number of atoms present or the chemical properties of the element.

5. Therefore, it is incorrect to say that all radioactive nuclides of an element have the same half-life or that different atoms of the same nuclide have different half-lives. Each radioactive isotope has its own unique half-life.

In conclusion, the true statement is that each radioactive isotope has its own half-life.

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Answer:

4 valence electrons.

Explanation:

Carbon has 4 valence electrons because it is in the 14th group on the Periodic Table.