do you think 1 gram of sucrose or 1 gram of sodium chloride will melt at a higher temperature

Answer:

How is metallic bonding different from ionic bonding? ... In an ionic bond the valence electrons are transferred from the metal only to the neighboring nonmetal, but in metallic bonding the valence electrons of each atom/ion are free to move or float around within the entire metal solid.

The number of moles of potassium permanganate in 2.5 grams of the solution is 0.016moles (option A).

The number of moles of a substance is amount of the substance of a system which contains exactly 6.02214076 × 10²³ atoms or molecules.

The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass as follows:

no of moles = mass ÷ molar mass

According to this question, there are 2.50 grams sample of potassium permanganate. The molar mass of potassium permanganate is 158.034 g/mol.

no of moles = 2.5g ÷ 158.034g/mol

moles = 0.016moles

Therefore, 0.016moles are in 2.5 grams of the solution.

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Considering the definition of molar mass, the correct answer is option a. 0.016 moles of potassium permanganate are in the sample

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

The molar mass of a compound is the sum of the molar mass of the elements that form it multiplied by the number of times they appear in the compound.

In this case, you know the molar mass of the elements is:

So, the molar mass of the compound KMnO₄ is calculated as:

KMnO₄= 39.1 g/mole + 54.94 g/mole + 4× 16 g/mole

Solving:

KMnO₄= 158.04 g/mole

You can apply the following rule of three: If by definition of molar mass 158.04 grams of the compound are contained in 1 mole, 2.50 grams are contained in how many moles?

amount of moles= (2.50 grams× 1 mole)÷ 158.04 grams

mass= 0.016 moles

Finally, there are 0.016 moles.

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Answer: Double Replacement

Explanation:

This is double replacement.

KBr + AgNO₃ ⇒ AgBr + KNO₃

On the left side K is paired with Br. On the right side K is paired with NO₃.

On the left side Ag is paired with NO₃. On the right side Ag is paired with Br.

The cations, K and Ag, "switched partners" in the reaction.

The p-value would depend on the calculated chi-square statistic and the degrees of freedom associated with the test.

To determine the p-value for the given scenario, we need to perform a statistical test, such as a chi-square test, to assess the association between gender and having a major co-existing condition (MCC).

The observed data can be summarized in a contingency table as follows:

Male 195 105

Female 205 245

To calculate the p-value, we would perform a chi-square test on this contingency table, comparing the observed frequencies to the expected frequencies under the assumption of independence between gender and MCC.

After conducting the chi-square test, the resulting p-value will indicate the probability of observing the given data or data more extreme if there is truly no association between gender and MCC.

However, without the expected frequencies or the results of the chi-square test, it is not possible to determine the exact p-value. Therefore, none of the provided options (A. 49, B. 53, C. 59, D. 50) can be considered as the correct answer. The p-value would depend on the calculated chi-square statistic and the degrees of freedom associated with the test.

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Answer:

13. A

14. C

Explanation: i tried my best

The substance that possesses the larger standard entropy is 1 mol of As4(g) at 300 ∘C, 0.01 atm. As4 has a larger size and more complex structure than P4.

The standard entropy of a substance is a measure of the disorder or randomness of its particles. The higher the entropy, the more disordered the particles are. In this case, we are comparing the standard entropies of P4(g) and As4(g) at the same temperature and pressure.

Standard entropy is a measure of the randomness or disorder of a substance. Generally, larger, more complex molecules have higher standard entropy values than smaller, simpler molecules. As4 is larger and heavier than P4 due to the higher atomic weight of arsenic compared to phosphorus.
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hojbiuhok.

Explanation:

.;..........hv

Bond length is related to bond order: when more electrons participate in bond formation the bond is shorter. Bond length is also inversely related to bond strength and the bond dissociation energy: all other factors being equal, a stronger bond will be shorter.

The Rutherford model of the atom was proposed by Ernest Rutherford in 1911.

According to this model, the atom consists of a central positively charged nucleus around which negatively charged electrons revolve in circular orbits. This model was based on Rutherford's famous gold foil experiment, which demonstrated that atoms have a small, dense, positively charged nucleus. However, this model was found to have some major flaws, particularly regarding the stability of the electron orbits. According to classical physics, the electrons should continuously emit electromagnetic radiation and lose energy, eventually collapsing into the nucleus. This problem was resolved with the development of the wave mechanical models of the atom, also known as quantum mechanics. These models propose that electrons do not move in fixed orbits but rather occupy specific energy levels or orbitals around the nucleus. The behavior of electrons is described in terms of probability distributions, which determine the likelihood of finding an electron in a particular region of space around the nucleus. The wave mechanical models also explain the phenomena of electron spin, electron density, and electron tunneling. In conclusion, the main difference between the Rutherford and wave mechanical models is that the former is a classical model that describes the atom in terms of fixed orbits, while the latter is a quantum mechanical model that describes the atom in terms of probability distributions and energy levels.

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Answer:

closely related

Explanation:

The reason that atomic numbers are always integer values is because every element has a particular number of protons (option c).

Atomic number is defined as the number of protons present in the nucleus of an atom. Protons are positively charged particles, and their number determines the identity of the element. Since protons cannot be split into smaller particles, the atomic number is always a whole number.

This is in contrast to atomic mass, which takes into account both protons and neutrons and can result in non-integer values due to isotopes. The number of electrons in a neutral atom is equal to the number of protons, but it is the protons that define the atomic number. Hence, c is the correct option.

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Answer:

S + HNO3 = H2SO4 + NO2 + H2O

Explanation:

Answer:

Based on stoichiometry HNO3 to H2O is 6:2

Use 9 grams to find the moles of HNO3

9 grams/63g/mol=0.143 moles of HNO3

HNO3:H2O

6:2

0.143*2/6=0.048

H2O moles is 0.048moles

Mass of water =0.048moles*18g/mol=0.864g

To the nearest tenth=0.9grams

Explanation:

I think this is right

The solubility of carbon dioxide in water at an atmospheric pressure of 0.540 atm is 1.40x10⁻² M

The amount of a substance's concentration that dissolves in a solvent at a particular temperature is known as its solubility. The type of bond, mass, temperature, and pressure all affect solubility.

The solubility can be calculate with formula below:

S = KH*P  

where

S= Solubility

KH = measure of hardness of water / carbonate hardness = 3.50*10⁻² mol/L.atm

P = atmospheric pressure = 0.5400 atm

Thus, we got

S = KH*P

= (3.50x10⁻² mol/L.atm)*(0.5400 atm)

= 1.89 x 10⁻² mol/L

But 1 mol/L = 1 M,

Therefore, the answer (1.40*10⁻² mol/L ) is equivalent to  1.40x10⁻² M

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Answer:

A polar covalent bond will have the electrons shifted more towards one side or the other; a nonpolar bond will have evenly distributed electrons.

Explanation:

  The basis for a polar bond is that the electrons are shared unevenly. Some elements are more electronegative than others; that is, they pull harder on the electrons and tend to have more electrons around them. Following the periodic trends, Fluorine is the most electronegative element, so it will likely have the most dense area of electrons in a molecule. All this means that in a polar molecule, the electrons will be spread out unevenly along the lengths of the bonds as some elements will pull on them more than others will.

  Nonpolar molecules do not have to worry about differences in electronegativity, and so the electron density will be pretty evenly distributed along the entire molecule.

Hope this helps! :)

The mass percent composition of nitrogen in acetaminophen is 9.26 %.

The mass percent composition of an element is the percentage of the ratio of the molar mass of that element to the molar mass of the entire compound. Acetaminophen represented as C8H9NO2 is a drug that is used as a pain reliever.

First, we will calculate the molar mass of this compound. For this, we should know the mass of each element present in the compound.

mass of C = 12, mass of H = 1, mas of N = 14, mass of  O = 16.

Now, we will calculate the molar mass of acetaminophen

= 12*8+ 1*9+14*1+16*2

=  151 g

Now, we have to calculate the mass percent composition of Nitrogen.

The molar mass of nitrogen = 14g

The molar mass of the entire compound =  151 grams.

Mass percent composition of N =  (mm of N ÷ mm of C8H9NO2) ×100

=  (14/151) × 100 =  0.0926 × 100

= 9.26 %

Therefore, the mass percent composition of nitrogen in acetaminophen (C8H9N02) is 9.26%.

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Thomson's atomic model is also known as the "plum pudding model." He assumed that atoms are neutral spheres with electrons distributed throughout them. Thomson's model was widely accepted, but later studies discovered its shortcomings.

It was discovered that the negatively charged electrons were not distributed uniformly around the atom, as Thomson's model suggested. They are, in reality, in shells that circle the positively charged nucleus. Thomson's model was incapable of accurately representing the atomic structure, unlike the models developed after it, such as Rutherford's model. Thomson's model was refuted by the gold foil experiment conducted by Rutherford. The discovery of the nucleus was a significant scientific breakthrough that eventually led to the development of modern atomic theory. Thomson's atomic model was disproved by Ernest Rutherford's gold foil experiment, which showed that the atom was mostly empty space with electrons orbiting a positively charged nucleus. Thomson's model predicted that the negatively charged electrons were dispersed uniformly throughout the atom, which was found to be incorrect. Thomson's model was unable to explain why the alpha particles in the gold foil experiment were scattered rather than passing straight through, as they would have in Thomson's model of a diffuse atom. Thomson's atomic model was unable to account for the massive concentration of positive charge in the atom's nucleus. Thomson's model was no longer adequate for understanding the complexities of atomic structure, unlike Rutherford's model, which better depicted the structure of atoms.

Thomson's atomic model was a significant scientific breakthrough that advanced our understanding of atomic structure at the time. However, with the discovery of the nucleus and electrons' arrangement in shells, Thomson's model was proven to be incorrect. His model could not explain the scattering pattern observed in Rutherford's gold foil experiment, which indicated that the majority of an atom was empty space with a small, concentrated positively charged nucleus. Rutherford's atomic model was eventually accepted as the most accurate representation of the atom.

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To maintain an equilibrium constant and equilibrium position, it is essential to keep the following variables constant:

1. Temperature: Changing the temperature can alter the equilibrium constant, as it affects the reaction rates and the energy distribution within the system.
2. Pressure (for gaseous reactions): Pressure affects the concentration of reactants and products, and changing it can shift the equilibrium position.
3. Concentration: The equilibrium position is determined by the concentrations of reactants and products, so maintaining constant concentrations is necessary.

By keeping these variables constant, you can ensure that the equilibrium constant and equilibrium position remain stable.

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The delta G of ATP hydrolysis in this cell is approximately -29.5 kJ/mol, which is closest to the answer of -30.5 kJ/mol.

To calculate the delta G of ATP hydrolysis, we use the formula:
ΔG = ΔG° + RT ln([ADP][Pi]/[ATP])
Where ΔG° is the standard free energy change (-30.5 kJ/mol), R is the gas constant (8.314 J/mol*K), T is the temperature in Kelvin (assumed to be 298 K), and [ADP], [Pi], and [ATP] are the concentrations of adenosine diphosphate, inorganic phosphate, and adenosine triphosphate, respectively.
Substituting the given concentrations, we get:
ΔG = -30.5 kJ/mol + (8.314 J/mol*K * 298 K) * ln((25 mm) * (10 mm) / (5 mm))
ΔG = -30.5 kJ/mol + (8.314 J/mol*K * 298 K) * ln(50)
ΔG = -30.5 kJ/mol + (8.314 J/mol*K * 298 K) * 3.912
ΔG = -30.5 kJ/mol + 972.9 J/mol
ΔG = -30.5 kJ/mol + 0.973 kJ/mol
ΔG = -29.527 kJ/mol
Therefore, the delta G of ATP hydrolysis in this cell is approximately -29.5 kJ/mol, which is closest to the answer of -30.5 kJ/mol.

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The solution with the greatest boiling-point elevation among the given options is Mg(NO₃)₂.

The boiling-point elevation of a solution depends on the concentration of solute particles. In this case, we have three solutions: Mg(NO₃)₂, NaNO₃, and C₂H₄(OH)₂.

Mg(NO₃)₂ dissociates into three ions: Mg²⁺ and two NO₃⁻ ions. NaNO₃ dissociates into two ions: Na⁺ and NO₃⁻. C₂H₄(OH)₂ does not dissociate, so it remains as one molecule.

Since the boiling-point elevation is directly proportional to the number of solute particles, Mg(NO₃)₂, with three ions per formula unit, will have the greatest boiling-point elevation. NaNO₃ has two ions per formula unit, and C₂H₄(OH)₂ has no ionization, resulting in fewer solute particles and lower boiling-point elevation compared to Mg(NO₃)₂.

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Given that the enthalpy change for the reaction is -67 kJ, the reaction is exothermic, and energy is released as the reaction occurs.

Enthalpy refers to the amount of energy that is stored in a compound's chemical bonds or the heat released or absorbed during a chemical reaction. It is a thermodynamic property that determines the quantity of energy released or absorbed during a process such as chemical reaction or change in state.

When a reaction absorbs energy from its surroundings, it is known as an endothermic reaction. The reaction's enthalpy, which is the energy released or absorbed during a reaction, is positive. The system absorbs energy, which is why it is denoted by a positive value.

When a reaction releases energy into the surrounding, it is referred to as an exothermic reaction. The reaction's enthalpy, which is the energy released or absorbed during a reaction, is negative. The system releases energy, which is why it is denoted by a negative value.

Therefore, the reaction is exothermic and energy is released when the reaction occurs.

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Answer:boron

Explanation:

Assuming the container initially contains an ideal gas at 518.0 kpa at 298.15 k, the aluminium aerosol can will rupture when the internal pressure reaches 210.0 psi, whereas it will burst at 822.50 K.

Pressure is the force applied per unit area over the force perpendicular to an object's surface (symbol: p or P). The pressure as it relates to the air pressure around it is referred to as the gauge pressure. There are several different units used to express pressure. The behaviour of multiple  ideal gas under varied conditions is accurately approximated by the ideal gas law in thermodynamics. The Charle's Law, Boyle's Law, and T2 = (298.15*14.29)/5.18sT2 = 822.50K empirical laws are all combined in the Ideal Gas Equation.

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Answer:A

Explanation: The answer is A because short-day plants grow in fall and spring because they need less sunlight.

Answer:

The answer should be Cleavage

Answer:

D.

Explanation:

Burning is a chemical change as new substance (ash) is formed with new properties and it cannot be reversed.

The goodyear blimp is filled with nearly 203,000 cubic feet of Helium gas.

The helium inside the Goodyear blimp is considered to be an ideal gas.

The ideal gas law relates the pressure, volume, number of moles, and temperature to each other for an ideal gas, which is a reasonable assumption for the noble gases.

In such a case, all gases obey an equation of state known as the ideal gas law: PV = nRT, where n is the number of moles of the gas and R is the universal (or perfect) gas constant, 8.3144626 joules per kelvin per mole.

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Answer:

B: Atomic size

Explanation:

I just guess for the points

Answer:

5.17×10^21 ng

Explanation:

I assume you meant Tg if yes, the answer is this:

T is 10^12

5.17 Tg is 5.17×10^12 g

and n is 10^-9. but as we're converting g to ng, we don't include the - .

so now all we have to do is to put them all together!

5.17×10^12×10^9= 5.17×10^21 ng

if anything is unclear, ask me.