Which scientist help developed the current model of the atom which states that electrons are located in regions known as orbitals or electron clouds?
a. Neils Bohr
b. Erwin Schrodinger
c. Earnest Rutherford
d. Max Planck
e. James Cahdwick

A 1.50-L vessel is filled with helium at 25.0 °C and 3.04 atm. Under these conditions, the mass of helium is 0.744 g.

An ideal gas is that whose particles have negligible volume and intermolecular forces.

A 1.50 L vessel at 25.0 °C contains He at a pressure of 3.04 atm.

We will use the following expression.

K = °C + 273.15 = 25.0 + 273.15 = 298.2 K

We will use the ideal gas equation.

P × V = n × R × T

n = P × V / R × T

n = 3.04 atm × 1.50 L / (0.0821 atm.L/mol.K) × 298.2 K = 0.186 mol

The molar mass of He is 4.00 g/mol.

0.186 mol × 4.00 g/mol = 0.744 g

A 1.50-L vessel is filled with helium at 25.0 °C and 3.04 atm. Under these conditions, the mass of helium is 0.744 g.

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The activation energy of the reaction is approximately 71.46 kJ/mol, rounded to 2 decimal places.

To find the activation energy (Ea) of the reaction, we can use the Arrhenius equation, which relates the rate constant (k) to the temperature (T) and activation energy. The Arrhenius equation is given by:

k = A * e^(-Ea/RT)

Where:

k is the rate constant

A is the pre-exponential factor (frequency factor)

Ea is the activation energy

R is the gas constant (8.314 J/(mol·K))

T is the temperature in Kelvin

We have two sets of data:

At 600 K, k1 = 3.4 m^(-1)s^(-1)

At 750 K, k2 = 31.0 m^(-1)s^(-1)

Taking the natural logarithm (ln) of both sides of the Arrhenius equation, we can rearrange the equation to solve for the activation energy:

ln(k) = ln(A) - (Ea/RT)

We can create two equations using the given data:

ln(k1) = ln(A) - (Ea/(R * 600))

ln(k2) = ln(A) - (Ea/(R * 750))

Subtracting the second equation from the first eliminates the ln(A) term:

ln(k1) - ln(k2) = (Ea/R) * ((1/600) - (1/750))

Simplifying further:

ln(k1/k2) = (Ea/R) * ((750 - 600) / (600 * 750))

Now we can solve for Ea:

Ea = (R * (ln(k1/k2))) / ((750 - 600) / (600 * 750))

Using the given values and the appropriate units:

Ea = (8.314 J/(mol·K) * ln(3.4/31.0)) / ((750 - 600) / (600 * 750))

Converting the units from J to kJ:

Ea = (8.314 × 10^(-3) kJ/(mol·K) * ln(3.4/31.0)) / ((750 - 600) / (600 * 750))

Ea ≈ 71.46 kJ/mol

Therefore, the activation energy of the reaction is approximately 71.46 kJ/mol, rounded to 2 decimal places.

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Rutherford's -particle scattering experiment provides the empirical support for drawing the inference that the majority of atomic space is empty.

what is gold foil experiment?

Rutherford described the gold-foil experiment.

The α-particles in his experiment were made to land on a thin piece of gold foil.

The gold foil was linearly penetrated by the majority of the α-particles.

A few of the particles made slight angular deviations.

Every 12000 particles, one of them seemed to bounce.

Rutherford's atomic model's conclusion

The majority of the -particles went through the gold foil without deflecting, leaving essentially no space inside the atom.

Since the positive charge takes up the smallest amount of space, very few particles are likely to have been deflected off their course.

Indicating that all of the positive charge and mass of the gold atom were concentrated in a very compact volume within the atom, a very small percentage of -particles were redirected by 180°.

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An equation is a mathematical statement that shows that two expressions are equal. An equation uses mathematical symbols to indicate the relationship between the two expressions represented on either side of the equal sign. A pair of equations is a set of two or more equations that are related to each other and can be solved together to find a solution.

The equation in this case represents the relationship between two variables, typically x and y, and is used to graph a line on a coordinate plane. The pair of equations represents a system of equations, which is a set of two or more equations that must be solved simultaneously. The solution to a system of equations is the set of points that satisfy all the equations in the system. For the given pair of equations: 4x - 2y = 6 and 2x + y = 3, the solution set is the set of points that satisfy both equations. We can solve for y in the second equation to get y = 3 - 2x. Substituting this into the first equation gives 4x - 2(3 - 2x) = 6. Simplifying gives 8x - 6 = 6. Solving for x gives x = 3/4. Substituting this back into the second equation gives y = 3 - 2(3/4) = 3/2. So the solution is the ordered pair (3/4, 3/2). To illustrate this solution set, we can graph both equations on the same coordinate plane and look for the point where they intersect, which will be the solution. The graph is shown below:

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what image? you didn't attach one.

Answer:

\(5850\ \text{cal}\)

Explanation:

m = Mass of water = 4500 g

c = Specific heat of water = \(1\ \text{cal/g}^{\circ}\text{C}\)

\(\Delta T\) = Change in temperature of water = \(1.3^{\circ}\text{C}\)

Heat is given by

\(q=mc\Delta T\\\Rightarrow q=4500\times 1\times 1.3\\\Rightarrow q=5850\ \text{cal}\)

A slice of the bread contains \(5850\ \text{cal}\).

Al(NO3)3 solution concentration and the concentration of H3O+ ions in the solution following the addition of HNO3 are given in the problem. We can determine the presence of [Al(H2O)5(OH)2+] in the solution using this knowledge along with the known equilibria for the hydrolysis of Al3+.

For Al3+, the hydrolysis process may be expressed as follows:

Al(H2O)63+ + water becomes Al(H2O)5(OH)2+ + H3O+.

The reaction's equilibrium constant expression is as follows:

Al(H2O)5(OH)2+) = K

Al(H2O)63+ / [H3O+]

We must take into account the dissociation of Al(NO3)3 in water in order to determine [Al(H2O)5(OH)2+] in a 0.15 M solution of Al(NO3)3:

Al3+ (aq) + 3NO3- Al(NO3)3 (s) (aq)

Al3+ has a concentration of 0.45 M (3 times that of the Al(NO3)3 solution) in an Al(NO3)3 solution with a concentration of 0.15 M. H3O+ is present in the solution at a concentration of 0.10 M.

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Answer:

The volume of displaced fluid is equivalent to the volume of an object fully immersed in a fluid.

Answer: They are the same species and have the same traits.

Explanation: These horses are well, the same species because they are horses.  They have very similar traits.  

Let me know if this is right!

The limiting reagent is Copper (Cu)

First, balance the reaction before determining the limiting reactant.

Cu + 2Ag

Cu(NO3)2 + 2Ag from NO3

Take the beginning material amount and calculate the number of moles of one of the products to identify the limiting reactant. The limiting reactant is the one that produces a product with the fewest moles.

5.50×1.00/2.00=2.75

The limiting reactant is the one that is consumed first and sets a limit on the quantity of product(s) that can be produced. Calculate how many moles of each reactant are present and contrast this ratio with the mole ratio of the reactants in the balanced chemical equation to get the limiting reactant.

Copper is the limiting reactant since there are only 2.50 mol of it and only 2.50 mol of AgNO3 will result from the reaction.

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There is only 1 way to arrange 11 argon atoms in 11 slots.

The number of possible microstates for a system with 11 argon atoms in 11 slots is given by the formula for combinations, n choose k, where n is the number of slots and k is the number of particles. In this case, n = 11 and k = 11, so the number of microstates is 11 choose 11, which is equal to 1. This means that there is only 1 way to arrange 11 argon atoms in 11 slots.

However, it is important to note that the number of microstates changes if we consider the internal degrees of freedom of each argon atom, such as its rotational and vibrational energy.

In this case, each argon atom can occupy a range of energy states, and the number of microstates will be equal to the product of the number of energy states occupied by each particle.

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Calorimetry is the scientific study of the transformation of heat energy. A calorimeter is a device that is used to conduct these types of experiments. It is used to determine the heat transfer that occurs between two bodies that are at different temperatures.In the given problem, a piece of gold with a mass of 15.23 g and an initial temperature of 54 °C was dropped into a calorimeter that contains 28 g of water.

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The skeletal system is the system that provides support to an organism, internal and made up of bones and cartilage in vertebrates, external in some other animals.

Tendon is a tough band of flexible but inelastic fibrous collagen tissue that connects a muscle with its bony attachment and transmits the force which the muscle exerts.

The femur is the bone that extends from the pelvis to the knee in humans. It is the largest bone of the human body.

The carpal bones are any of the eight bones of the carpus, which is the group of bones that make up the wrist.

The osseous or bone tissue is the major structural and supportive connective tissue of the body which forms the rigid part of the bone organs that make up the skeletal system.

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Answer:

As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return back to the gas phase. As a result, the solubility of a gas decreases as the temperature increases.

Explanation:

Answer:

Reflection

Hope it will help you

Answer:Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids.

Explanation:Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

Answer: pOH is the negative logarithm of the hydroxide ion content given by the expression: pOH = 14 – pH.

Explanation:

95.8% is the percent yield for sodium chloride if 56.0 g of sodium chloride is produced in the reaction.

Percentage yield of any chemical reaction can be calculated as:

% yield = (Experimental yield/Theoretical yield) × 100

Given chemical reaction is:

NaHCO₃ + HCl → NaCl + CO₂ + H₂O

In the question it is given that 56 grams of NaCl is produced by mass. But according to the stoichiometry of the reaction 1 mole of NaCl will be produced whose mass should be 58.44 grams. So, % yield will be:

% yield = (56/58.44) × 100 = 95.8%

Hence, option (d) is correct it means 95.8% is the percent yield.

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The common feature of both sets of reaction is represented as that both include steps involving the hydrolysis of organic molecules.

The carbon skeleton of glucose has been broken down to CO2 with some net gain in ATP after glycolysis and the citric acid cycle, but before the electron transport chain and oxidative phosphorylation.

Answer and justification the citric acid cycle is the phase of cellular respiration where carbon dioxide is released. The Krebs cycle, oxidative phosphorylation, and glycolysis are the three phases of aerobic cellular respiration.

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Answer:

Physical changes are changes that do not alter the identity of a substance. Chemical changes are changes that occur when one substance is turned into another substance.

Explanation:

Answer:

The H+ concentration would decrease by 10 fold. From .01 to .001

Explanation:

This is due to how a pH of 2 is expressed in scientific notation as 10^-2 power when referring to H+ concentration so a pH of 3 would be 10^-3. Hence it would be 10 times smaller in concentration as the power increases to the negative power the smaller the concentration becomes.

Intermolecular  forces  of attraction prevent ice cubes from adopting the shape of their container,intermolecular forces are overcome when ice melts,intermolecular forces are overcome when liquid water is vaporized and for conversion to hydrogen and oxygen gas intramolecular forces are overcomed.

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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NHCI is not a strong electrolyte. While, LiOH, HNO₃, KBr, and HNO are strong electrolytes. Therefore, option D is correct.

Electrolytes are substances that conduct electricity when dissolved in water or melted. They are composed of ions, which are electrically charged particles. In a solution or a molten state, electrolytes dissociate into their constituent ions, allowing the flow of electric current.

The most common electrolytes are salts, acids, and bases. When these substances dissolve in water, they break apart into positive and negative ions. The positive ions are called cations, and the negative ions are called anions.

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When iteration is indicated for an element or a group of elements in the data dictionary, it means that the element or group can occur multiple times within a data structure or dataset.

In a data dictionary, iteration is indicated when there is a need to represent elements or groups of elements that can occur multiple times within a data structure or dataset.

Let's consider an example to illustrate this concept. Suppose we have a data structure called "Employees" that contains information about multiple employees in a company. Each employee has attributes such as name, age, and position. In this case, we can indicate iteration for the "Employees" element in the data dictionary because there can be more than one employee present in the data structure.

By indicating iteration, we are specifying that the "Employees" element can occur multiple times. This allows us to represent and store information for each individual employee within the data structure. It enables the data dictionary to account for the dynamic nature of the data and the possibility of having multiple occurrences of the same element or group of elements.

In practical terms, iteration can be represented in a data dictionary by using notations such as asterisks (*), brackets ([]), or explicit statements indicating the potential repetition of an element or group of elements.

By indicating iteration in the data dictionary, it provides clarity and guidance on how to structure and process the data within the defined data structure. It ensures that the necessary information is captured accurately and allows for efficient handling of the data during data processing or analysis.

In summary, when iteration is indicated for an element or a group of elements in a data dictionary, it signifies that the element or group can occur multiple times within the data structure or dataset, accommodating the potential repetition of data entities.

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Answer: It is B. :)

Explanation:

The best definition or description for the term uplift is the pressure from a volcano pushing the lava to the surface.

Uplift in geographical terms is a vertical elevation of earth's surface which is in response to the natural causes. It is associated with earthquakes and mountain building .

Uplift of earth's surface is in response to removal of ice sheets through melting of ice.It refers to the rising of the earth's portion while sinking is the downward shift of earth's surface.Uplift can be due to plate tectonic movements ,mountain building or gravitational adjustment of earth's crust.Mountain building results from uplift of lands.

During the process of uplift, the floor of the sea rises as the outer shell of the earth divides into sections which are moving,called as plates.When these plates crash they result into formation of mountains.

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In yeast, the reaction is eleventh order:Rate = K[ enzyme ] [isocitrate]⁴[AMP]²[NAD⁺]m [Mg²⁺]². The order with respect to NAD⁺ is 2.

The citric acid cycle is also called the Krebs cycle. This is the main source of energy that happens in aerobic conditions.

The coefficient that is raised to the active concentration of the reactants is the order in the mass action law. It is determined experimentally and can be fractional, positive, negative, or zero.

Each reactant's order, which is increased to its power in the rate law, is added to determine the order of the entire reaction.

The overall rate = 11

Rate of overall reaction = 1 + 4 + 2 + m + 2 = 11

9 + m = 11

m = 2

Thus, the order with respect to NAD⁺ is 2.

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